1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciField.hpp"
27 #include "ci/ciMethodData.hpp"
28 #include "ci/ciTypeFlow.hpp"
29 #include "ci/ciValueKlass.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "compiler/compileLog.hpp"
33 #include "libadt/dict.hpp"
34 #include "memory/oopFactory.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "oops/instanceKlass.hpp"
37 #include "oops/instanceMirrorKlass.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "oops/typeArrayKlass.hpp"
40 #include "opto/matcher.hpp"
41 #include "opto/node.hpp"
42 #include "opto/opcodes.hpp"
43 #include "opto/type.hpp"
44
45 // Portions of code courtesy of Clifford Click
46
47 // Optimization - Graph Style
48
49 // Dictionary of types shared among compilations.
50 Dict* Type::_shared_type_dict = NULL;
51 const Type::Offset Type::Offset::top(Type::OffsetTop);
52 const Type::Offset Type::Offset::bottom(Type::OffsetBot);
53
54 const Type::Offset Type::Offset::meet(const Type::Offset other) const {
55 // Either is 'TOP' offset? Return the other offset!
56 int offset = other._offset;
57 if (_offset == OffsetTop) return Offset(offset);
58 if (offset == OffsetTop) return Offset(_offset);
59 // If either is different, return 'BOTTOM' offset
60 if (_offset != offset) return bottom;
61 return Offset(_offset);
62 }
63
64 const Type::Offset Type::Offset::dual() const {
65 if (_offset == OffsetTop) return bottom;// Map 'TOP' into 'BOTTOM'
66 if (_offset == OffsetBot) return top;// Map 'BOTTOM' into 'TOP'
67 return Offset(_offset); // Map everything else into self
68 }
69
70 const Type::Offset Type::Offset::add(intptr_t offset) const {
71 // Adding to 'TOP' offset? Return 'TOP'!
72 if (_offset == OffsetTop || offset == OffsetTop) return top;
73 // Adding to 'BOTTOM' offset? Return 'BOTTOM'!
74 if (_offset == OffsetBot || offset == OffsetBot) return bottom;
75 // Addition overflows or "accidentally" equals to OffsetTop? Return 'BOTTOM'!
76 offset += (intptr_t)_offset;
77 if (offset != (int)offset || offset == OffsetTop) return bottom;
78
79 // assert( _offset >= 0 && _offset+offset >= 0, "" );
80 // It is possible to construct a negative offset during PhaseCCP
81
82 return Offset((int)offset); // Sum valid offsets
83 }
84
85 void Type::Offset::dump2(outputStream *st) const {
86 if (_offset == 0) {
87 return;
88 } else if (_offset == OffsetTop) {
89 st->print("+top");
90 }
91 else if (_offset == OffsetBot) {
92 st->print("+bot");
93 } else if (_offset) {
94 st->print("+%d", _offset);
95 }
96 }
97
98 // Array which maps compiler types to Basic Types
99 const Type::TypeInfo Type::_type_info[Type::lastype] = {
100 { Bad, T_ILLEGAL, "bad", false, Node::NotAMachineReg, relocInfo::none }, // Bad
101 { Control, T_ILLEGAL, "control", false, 0, relocInfo::none }, // Control
102 { Bottom, T_VOID, "top", false, 0, relocInfo::none }, // Top
103 { Bad, T_INT, "int:", false, Op_RegI, relocInfo::none }, // Int
104 { Bad, T_LONG, "long:", false, Op_RegL, relocInfo::none }, // Long
105 { Half, T_VOID, "half", false, 0, relocInfo::none }, // Half
106 { Bad, T_NARROWOOP, "narrowoop:", false, Op_RegN, relocInfo::none }, // NarrowOop
107 { Bad, T_NARROWKLASS,"narrowklass:", false, Op_RegN, relocInfo::none }, // NarrowKlass
108 { Bad, T_ILLEGAL, "tuple:", false, Node::NotAMachineReg, relocInfo::none }, // Tuple
109 { Bad, T_ARRAY, "array:", false, Node::NotAMachineReg, relocInfo::none }, // Array
110
111 #ifdef SPARC
112 { Bad, T_ILLEGAL, "vectors:", false, 0, relocInfo::none }, // VectorS
113 { Bad, T_ILLEGAL, "vectord:", false, Op_RegD, relocInfo::none }, // VectorD
114 { Bad, T_ILLEGAL, "vectorx:", false, 0, relocInfo::none }, // VectorX
115 { Bad, T_ILLEGAL, "vectory:", false, 0, relocInfo::none }, // VectorY
116 { Bad, T_ILLEGAL, "vectorz:", false, 0, relocInfo::none }, // VectorZ
117 #elif defined(PPC64)
118 { Bad, T_ILLEGAL, "vectors:", false, 0, relocInfo::none }, // VectorS
119 { Bad, T_ILLEGAL, "vectord:", false, Op_RegL, relocInfo::none }, // VectorD
120 { Bad, T_ILLEGAL, "vectorx:", false, Op_VecX, relocInfo::none }, // VectorX
121 { Bad, T_ILLEGAL, "vectory:", false, 0, relocInfo::none }, // VectorY
122 { Bad, T_ILLEGAL, "vectorz:", false, 0, relocInfo::none }, // VectorZ
123 #elif defined(S390)
124 { Bad, T_ILLEGAL, "vectors:", false, 0, relocInfo::none }, // VectorS
125 { Bad, T_ILLEGAL, "vectord:", false, Op_RegL, relocInfo::none }, // VectorD
126 { Bad, T_ILLEGAL, "vectorx:", false, 0, relocInfo::none }, // VectorX
127 { Bad, T_ILLEGAL, "vectory:", false, 0, relocInfo::none }, // VectorY
128 { Bad, T_ILLEGAL, "vectorz:", false, 0, relocInfo::none }, // VectorZ
129 #else // all other
130 { Bad, T_ILLEGAL, "vectors:", false, Op_VecS, relocInfo::none }, // VectorS
131 { Bad, T_ILLEGAL, "vectord:", false, Op_VecD, relocInfo::none }, // VectorD
132 { Bad, T_ILLEGAL, "vectorx:", false, Op_VecX, relocInfo::none }, // VectorX
133 { Bad, T_ILLEGAL, "vectory:", false, Op_VecY, relocInfo::none }, // VectorY
134 { Bad, T_ILLEGAL, "vectorz:", false, Op_VecZ, relocInfo::none }, // VectorZ
135 #endif
136 { Bad, T_VALUETYPE, "value:", false, Node::NotAMachineReg, relocInfo::none }, // ValueType
137 { Bad, T_ADDRESS, "anyptr:", false, Op_RegP, relocInfo::none }, // AnyPtr
138 { Bad, T_ADDRESS, "rawptr:", false, Op_RegP, relocInfo::none }, // RawPtr
139 { Bad, T_OBJECT, "oop:", true, Op_RegP, relocInfo::oop_type }, // OopPtr
140 { Bad, T_OBJECT, "inst:", true, Op_RegP, relocInfo::oop_type }, // InstPtr
141 { Bad, T_OBJECT, "ary:", true, Op_RegP, relocInfo::oop_type }, // AryPtr
142 { Bad, T_METADATA, "metadata:", false, Op_RegP, relocInfo::metadata_type }, // MetadataPtr
143 { Bad, T_METADATA, "klass:", false, Op_RegP, relocInfo::metadata_type }, // KlassPtr
144 { Bad, T_OBJECT, "func", false, 0, relocInfo::none }, // Function
145 { Abio, T_ILLEGAL, "abIO", false, 0, relocInfo::none }, // Abio
146 { Return_Address, T_ADDRESS, "return_address",false, Op_RegP, relocInfo::none }, // Return_Address
147 { Memory, T_ILLEGAL, "memory", false, 0, relocInfo::none }, // Memory
148 { FloatBot, T_FLOAT, "float_top", false, Op_RegF, relocInfo::none }, // FloatTop
149 { FloatCon, T_FLOAT, "ftcon:", false, Op_RegF, relocInfo::none }, // FloatCon
150 { FloatTop, T_FLOAT, "float", false, Op_RegF, relocInfo::none }, // FloatBot
151 { DoubleBot, T_DOUBLE, "double_top", false, Op_RegD, relocInfo::none }, // DoubleTop
152 { DoubleCon, T_DOUBLE, "dblcon:", false, Op_RegD, relocInfo::none }, // DoubleCon
153 { DoubleTop, T_DOUBLE, "double", false, Op_RegD, relocInfo::none }, // DoubleBot
154 { Top, T_ILLEGAL, "bottom", false, 0, relocInfo::none } // Bottom
155 };
156
157 // Map ideal registers (machine types) to ideal types
158 const Type *Type::mreg2type[_last_machine_leaf];
159
160 // Map basic types to canonical Type* pointers.
161 const Type* Type:: _const_basic_type[T_CONFLICT+1];
162
163 // Map basic types to constant-zero Types.
164 const Type* Type:: _zero_type[T_CONFLICT+1];
165
166 // Map basic types to array-body alias types.
167 const TypeAryPtr* TypeAryPtr::_array_body_type[T_CONFLICT+1];
168
169 //=============================================================================
170 // Convenience common pre-built types.
171 const Type *Type::ABIO; // State-of-machine only
172 const Type *Type::BOTTOM; // All values
173 const Type *Type::CONTROL; // Control only
174 const Type *Type::DOUBLE; // All doubles
175 const Type *Type::FLOAT; // All floats
176 const Type *Type::HALF; // Placeholder half of doublewide type
177 const Type *Type::MEMORY; // Abstract store only
178 const Type *Type::RETURN_ADDRESS;
179 const Type *Type::TOP; // No values in set
180
181 //------------------------------get_const_type---------------------------
182 const Type* Type::get_const_type(ciType* type) {
183 if (type == NULL) {
184 return NULL;
185 } else if (type->is_primitive_type()) {
186 return get_const_basic_type(type->basic_type());
187 } else {
188 return TypeOopPtr::make_from_klass(type->as_klass());
189 }
190 }
191
192 //---------------------------array_element_basic_type---------------------------------
193 // Mapping to the array element's basic type.
194 BasicType Type::array_element_basic_type() const {
195 BasicType bt = basic_type();
196 if (bt == T_INT) {
197 if (this == TypeInt::INT) return T_INT;
198 if (this == TypeInt::CHAR) return T_CHAR;
199 if (this == TypeInt::BYTE) return T_BYTE;
200 if (this == TypeInt::BOOL) return T_BOOLEAN;
201 if (this == TypeInt::SHORT) return T_SHORT;
202 return T_VOID;
203 }
204 return bt;
205 }
206
207 // For two instance arrays of same dimension, return the base element types.
208 // Otherwise or if the arrays have different dimensions, return NULL.
209 void Type::get_arrays_base_elements(const Type *a1, const Type *a2,
210 const TypeInstPtr **e1, const TypeInstPtr **e2) {
211
212 if (e1) *e1 = NULL;
213 if (e2) *e2 = NULL;
214 const TypeAryPtr* a1tap = (a1 == NULL) ? NULL : a1->isa_aryptr();
215 const TypeAryPtr* a2tap = (a2 == NULL) ? NULL : a2->isa_aryptr();
216
217 if (a1tap != NULL && a2tap != NULL) {
218 // Handle multidimensional arrays
219 const TypePtr* a1tp = a1tap->elem()->make_ptr();
220 const TypePtr* a2tp = a2tap->elem()->make_ptr();
221 while (a1tp && a1tp->isa_aryptr() && a2tp && a2tp->isa_aryptr()) {
222 a1tap = a1tp->is_aryptr();
223 a2tap = a2tp->is_aryptr();
224 a1tp = a1tap->elem()->make_ptr();
225 a2tp = a2tap->elem()->make_ptr();
226 }
227 if (a1tp && a1tp->isa_instptr() && a2tp && a2tp->isa_instptr()) {
228 if (e1) *e1 = a1tp->is_instptr();
229 if (e2) *e2 = a2tp->is_instptr();
230 }
231 }
232 }
233
234 //---------------------------get_typeflow_type---------------------------------
235 // Import a type produced by ciTypeFlow.
236 const Type* Type::get_typeflow_type(ciType* type) {
237 switch (type->basic_type()) {
238
239 case ciTypeFlow::StateVector::T_BOTTOM:
240 assert(type == ciTypeFlow::StateVector::bottom_type(), "");
241 return Type::BOTTOM;
242
243 case ciTypeFlow::StateVector::T_TOP:
244 assert(type == ciTypeFlow::StateVector::top_type(), "");
245 return Type::TOP;
246
247 case ciTypeFlow::StateVector::T_NULL:
248 assert(type == ciTypeFlow::StateVector::null_type(), "");
249 return TypePtr::NULL_PTR;
250
251 case ciTypeFlow::StateVector::T_LONG2:
252 // The ciTypeFlow pass pushes a long, then the half.
253 // We do the same.
254 assert(type == ciTypeFlow::StateVector::long2_type(), "");
255 return TypeInt::TOP;
256
257 case ciTypeFlow::StateVector::T_DOUBLE2:
258 // The ciTypeFlow pass pushes double, then the half.
259 // Our convention is the same.
260 assert(type == ciTypeFlow::StateVector::double2_type(), "");
261 return Type::TOP;
262
263 case T_ADDRESS:
264 assert(type->is_return_address(), "");
265 return TypeRawPtr::make((address)(intptr_t)type->as_return_address()->bci());
266
267 case T_VALUETYPE: {
268 bool is_never_null = type->is_never_null();
269 ciValueKlass* vk = type->unwrap()->as_value_klass();
270 if (vk->is_scalarizable() && is_never_null) {
271 return TypeValueType::make(vk);
272 } else {
273 return TypeOopPtr::make_from_klass(vk)->join_speculative(is_never_null ? TypePtr::NOTNULL : TypePtr::BOTTOM);
274 }
275 }
276
277 default:
278 // make sure we did not mix up the cases:
279 assert(type != ciTypeFlow::StateVector::bottom_type(), "");
280 assert(type != ciTypeFlow::StateVector::top_type(), "");
281 assert(type != ciTypeFlow::StateVector::null_type(), "");
282 assert(type != ciTypeFlow::StateVector::long2_type(), "");
283 assert(type != ciTypeFlow::StateVector::double2_type(), "");
284 assert(!type->is_return_address(), "");
285
286 return Type::get_const_type(type);
287 }
288 }
289
290
291 //-----------------------make_from_constant------------------------------------
292 const Type* Type::make_from_constant(ciConstant constant, bool require_constant,
293 int stable_dimension, bool is_narrow_oop,
294 bool is_autobox_cache) {
295 switch (constant.basic_type()) {
296 case T_BOOLEAN: return TypeInt::make(constant.as_boolean());
297 case T_CHAR: return TypeInt::make(constant.as_char());
298 case T_BYTE: return TypeInt::make(constant.as_byte());
299 case T_SHORT: return TypeInt::make(constant.as_short());
300 case T_INT: return TypeInt::make(constant.as_int());
301 case T_LONG: return TypeLong::make(constant.as_long());
302 case T_FLOAT: return TypeF::make(constant.as_float());
303 case T_DOUBLE: return TypeD::make(constant.as_double());
304 case T_ARRAY:
305 case T_VALUETYPE:
306 case T_OBJECT: {
307 const Type* con_type = NULL;
308 ciObject* oop_constant = constant.as_object();
309 if (oop_constant->is_null_object()) {
310 con_type = Type::get_zero_type(T_OBJECT);
311 } else {
312 guarantee(require_constant || oop_constant->should_be_constant(), "con_type must get computed");
313 con_type = TypeOopPtr::make_from_constant(oop_constant, require_constant);
314 if (Compile::current()->eliminate_boxing() && is_autobox_cache) {
315 con_type = con_type->is_aryptr()->cast_to_autobox_cache(true);
316 }
317 if (stable_dimension > 0) {
318 assert(FoldStableValues, "sanity");
319 assert(!con_type->is_zero_type(), "default value for stable field");
320 con_type = con_type->is_aryptr()->cast_to_stable(true, stable_dimension);
321 }
322 }
323 if (is_narrow_oop) {
324 con_type = con_type->make_narrowoop();
325 }
326 return con_type;
327 }
328 case T_ILLEGAL:
329 // Invalid ciConstant returned due to OutOfMemoryError in the CI
330 assert(Compile::current()->env()->failing(), "otherwise should not see this");
331 return NULL;
332 default:
333 // Fall through to failure
334 return NULL;
335 }
336 }
337
338 static ciConstant check_mismatched_access(ciConstant con, BasicType loadbt, bool is_unsigned) {
339 BasicType conbt = con.basic_type();
340 switch (conbt) {
341 case T_BOOLEAN: conbt = T_BYTE; break;
342 case T_ARRAY: conbt = T_OBJECT; break;
343 case T_VALUETYPE: conbt = T_OBJECT; break;
344 default: break;
345 }
346 switch (loadbt) {
347 case T_BOOLEAN: loadbt = T_BYTE; break;
348 case T_NARROWOOP: loadbt = T_OBJECT; break;
349 case T_ARRAY: loadbt = T_OBJECT; break;
350 case T_VALUETYPE: loadbt = T_OBJECT; break;
351 case T_ADDRESS: loadbt = T_OBJECT; break;
352 default: break;
353 }
354 if (conbt == loadbt) {
355 if (is_unsigned && conbt == T_BYTE) {
356 // LoadB (T_BYTE) with a small mask (<=8-bit) is converted to LoadUB (T_BYTE).
357 return ciConstant(T_INT, con.as_int() & 0xFF);
358 } else {
359 return con;
360 }
361 }
362 if (conbt == T_SHORT && loadbt == T_CHAR) {
363 // LoadS (T_SHORT) with a small mask (<=16-bit) is converted to LoadUS (T_CHAR).
364 return ciConstant(T_INT, con.as_int() & 0xFFFF);
365 }
366 return ciConstant(); // T_ILLEGAL
367 }
368
369 // Try to constant-fold a stable array element.
370 const Type* Type::make_constant_from_array_element(ciArray* array, int off, int stable_dimension,
371 BasicType loadbt, bool is_unsigned_load) {
372 // Decode the results of GraphKit::array_element_address.
373 ciConstant element_value = array->element_value_by_offset(off);
374 if (element_value.basic_type() == T_ILLEGAL) {
375 return NULL; // wrong offset
376 }
377 ciConstant con = check_mismatched_access(element_value, loadbt, is_unsigned_load);
378
379 assert(con.basic_type() != T_ILLEGAL, "elembt=%s; loadbt=%s; unsigned=%d",
380 type2name(element_value.basic_type()), type2name(loadbt), is_unsigned_load);
381
382 if (con.is_valid() && // not a mismatched access
383 !con.is_null_or_zero()) { // not a default value
384 bool is_narrow_oop = (loadbt == T_NARROWOOP);
385 return Type::make_from_constant(con, /*require_constant=*/true, stable_dimension, is_narrow_oop, /*is_autobox_cache=*/false);
386 }
387 return NULL;
388 }
389
390 const Type* Type::make_constant_from_field(ciInstance* holder, int off, bool is_unsigned_load, BasicType loadbt) {
391 ciField* field;
392 ciType* type = holder->java_mirror_type();
393 if (type != NULL && type->is_instance_klass() && off >= InstanceMirrorKlass::offset_of_static_fields()) {
394 // Static field
395 field = type->as_instance_klass()->get_field_by_offset(off, /*is_static=*/true);
396 } else {
397 // Instance field
398 field = holder->klass()->as_instance_klass()->get_field_by_offset(off, /*is_static=*/false);
399 }
400 if (field == NULL) {
401 return NULL; // Wrong offset
402 }
403 return Type::make_constant_from_field(field, holder, loadbt, is_unsigned_load);
404 }
405
406 const Type* Type::make_constant_from_field(ciField* field, ciInstance* holder,
407 BasicType loadbt, bool is_unsigned_load) {
408 if (!field->is_constant()) {
409 return NULL; // Non-constant field
410 }
411 ciConstant field_value;
412 if (field->is_static()) {
413 // final static field
414 field_value = field->constant_value();
415 } else if (holder != NULL) {
416 // final or stable non-static field
417 // Treat final non-static fields of trusted classes (classes in
418 // java.lang.invoke and sun.invoke packages and subpackages) as
419 // compile time constants.
420 field_value = field->constant_value_of(holder);
421 }
422 if (!field_value.is_valid()) {
423 return NULL; // Not a constant
424 }
425
426 ciConstant con = check_mismatched_access(field_value, loadbt, is_unsigned_load);
427
428 assert(con.is_valid(), "elembt=%s; loadbt=%s; unsigned=%d",
429 type2name(field_value.basic_type()), type2name(loadbt), is_unsigned_load);
430
431 bool is_stable_array = FoldStableValues && field->is_stable() && field->type()->is_array_klass();
432 int stable_dimension = (is_stable_array ? field->type()->as_array_klass()->dimension() : 0);
433 bool is_narrow_oop = (loadbt == T_NARROWOOP);
434
435 const Type* con_type = make_from_constant(con, /*require_constant=*/ true,
436 stable_dimension, is_narrow_oop,
437 field->is_autobox_cache());
438 if (con_type != NULL && field->is_call_site_target()) {
439 ciCallSite* call_site = holder->as_call_site();
440 if (!call_site->is_constant_call_site()) {
441 ciMethodHandle* target = con.as_object()->as_method_handle();
442 Compile::current()->dependencies()->assert_call_site_target_value(call_site, target);
443 }
444 }
445 return con_type;
446 }
447
448 //------------------------------make-------------------------------------------
449 // Create a simple Type, with default empty symbol sets. Then hashcons it
450 // and look for an existing copy in the type dictionary.
451 const Type *Type::make( enum TYPES t ) {
452 return (new Type(t))->hashcons();
453 }
454
455 //------------------------------cmp--------------------------------------------
456 int Type::cmp( const Type *const t1, const Type *const t2 ) {
457 if( t1->_base != t2->_base )
458 return 1; // Missed badly
459 assert(t1 != t2 || t1->eq(t2), "eq must be reflexive");
460 return !t1->eq(t2); // Return ZERO if equal
461 }
462
463 const Type* Type::maybe_remove_speculative(bool include_speculative) const {
464 if (!include_speculative) {
465 return remove_speculative();
466 }
467 return this;
468 }
469
470 //------------------------------hash-------------------------------------------
471 int Type::uhash( const Type *const t ) {
472 return t->hash();
473 }
474
475 #define SMALLINT ((juint)3) // a value too insignificant to consider widening
476
477 static double pos_dinf() {
478 union { int64_t i; double d; } v;
479 v.i = CONST64(0x7ff0000000000000);
480 return v.d;
481 }
482
483 static float pos_finf() {
484 union { int32_t i; float f; } v;
485 v.i = 0x7f800000;
486 return v.f;
487 }
488
489 //--------------------------Initialize_shared----------------------------------
490 void Type::Initialize_shared(Compile* current) {
491 // This method does not need to be locked because the first system
492 // compilations (stub compilations) occur serially. If they are
493 // changed to proceed in parallel, then this section will need
494 // locking.
495
496 Arena* save = current->type_arena();
497 Arena* shared_type_arena = new (mtCompiler)Arena(mtCompiler);
498
499 current->set_type_arena(shared_type_arena);
500 _shared_type_dict =
501 new (shared_type_arena) Dict( (CmpKey)Type::cmp, (Hash)Type::uhash,
502 shared_type_arena, 128 );
503 current->set_type_dict(_shared_type_dict);
504
505 // Make shared pre-built types.
506 CONTROL = make(Control); // Control only
507 TOP = make(Top); // No values in set
508 MEMORY = make(Memory); // Abstract store only
509 ABIO = make(Abio); // State-of-machine only
510 RETURN_ADDRESS=make(Return_Address);
511 FLOAT = make(FloatBot); // All floats
512 DOUBLE = make(DoubleBot); // All doubles
513 BOTTOM = make(Bottom); // Everything
514 HALF = make(Half); // Placeholder half of doublewide type
515
516 TypeF::ZERO = TypeF::make(0.0); // Float 0 (positive zero)
517 TypeF::ONE = TypeF::make(1.0); // Float 1
518 TypeF::POS_INF = TypeF::make(pos_finf());
519 TypeF::NEG_INF = TypeF::make(-pos_finf());
520
521 TypeD::ZERO = TypeD::make(0.0); // Double 0 (positive zero)
522 TypeD::ONE = TypeD::make(1.0); // Double 1
523 TypeD::POS_INF = TypeD::make(pos_dinf());
524 TypeD::NEG_INF = TypeD::make(-pos_dinf());
525
526 TypeInt::MINUS_1 = TypeInt::make(-1); // -1
527 TypeInt::ZERO = TypeInt::make( 0); // 0
528 TypeInt::ONE = TypeInt::make( 1); // 1
529 TypeInt::BOOL = TypeInt::make(0,1, WidenMin); // 0 or 1, FALSE or TRUE.
530 TypeInt::CC = TypeInt::make(-1, 1, WidenMin); // -1, 0 or 1, condition codes
531 TypeInt::CC_LT = TypeInt::make(-1,-1, WidenMin); // == TypeInt::MINUS_1
532 TypeInt::CC_GT = TypeInt::make( 1, 1, WidenMin); // == TypeInt::ONE
533 TypeInt::CC_EQ = TypeInt::make( 0, 0, WidenMin); // == TypeInt::ZERO
534 TypeInt::CC_LE = TypeInt::make(-1, 0, WidenMin);
535 TypeInt::CC_GE = TypeInt::make( 0, 1, WidenMin); // == TypeInt::BOOL
536 TypeInt::BYTE = TypeInt::make(-128,127, WidenMin); // Bytes
537 TypeInt::UBYTE = TypeInt::make(0, 255, WidenMin); // Unsigned Bytes
538 TypeInt::CHAR = TypeInt::make(0,65535, WidenMin); // Java chars
539 TypeInt::SHORT = TypeInt::make(-32768,32767, WidenMin); // Java shorts
540 TypeInt::POS = TypeInt::make(0,max_jint, WidenMin); // Non-neg values
541 TypeInt::POS1 = TypeInt::make(1,max_jint, WidenMin); // Positive values
542 TypeInt::INT = TypeInt::make(min_jint,max_jint, WidenMax); // 32-bit integers
543 TypeInt::SYMINT = TypeInt::make(-max_jint,max_jint,WidenMin); // symmetric range
544 TypeInt::TYPE_DOMAIN = TypeInt::INT;
545 // CmpL is overloaded both as the bytecode computation returning
546 // a trinary (-1,0,+1) integer result AND as an efficient long
547 // compare returning optimizer ideal-type flags.
548 assert( TypeInt::CC_LT == TypeInt::MINUS_1, "types must match for CmpL to work" );
549 assert( TypeInt::CC_GT == TypeInt::ONE, "types must match for CmpL to work" );
550 assert( TypeInt::CC_EQ == TypeInt::ZERO, "types must match for CmpL to work" );
551 assert( TypeInt::CC_GE == TypeInt::BOOL, "types must match for CmpL to work" );
552 assert( (juint)(TypeInt::CC->_hi - TypeInt::CC->_lo) <= SMALLINT, "CC is truly small");
553
554 TypeLong::MINUS_1 = TypeLong::make(-1); // -1
555 TypeLong::ZERO = TypeLong::make( 0); // 0
556 TypeLong::ONE = TypeLong::make( 1); // 1
557 TypeLong::POS = TypeLong::make(0,max_jlong, WidenMin); // Non-neg values
558 TypeLong::LONG = TypeLong::make(min_jlong,max_jlong,WidenMax); // 64-bit integers
559 TypeLong::INT = TypeLong::make((jlong)min_jint,(jlong)max_jint,WidenMin);
560 TypeLong::UINT = TypeLong::make(0,(jlong)max_juint,WidenMin);
561 TypeLong::TYPE_DOMAIN = TypeLong::LONG;
562
563 const Type **fboth =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
564 fboth[0] = Type::CONTROL;
565 fboth[1] = Type::CONTROL;
566 TypeTuple::IFBOTH = TypeTuple::make( 2, fboth );
567
568 const Type **ffalse =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
569 ffalse[0] = Type::CONTROL;
570 ffalse[1] = Type::TOP;
571 TypeTuple::IFFALSE = TypeTuple::make( 2, ffalse );
572
573 const Type **fneither =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
574 fneither[0] = Type::TOP;
575 fneither[1] = Type::TOP;
576 TypeTuple::IFNEITHER = TypeTuple::make( 2, fneither );
577
578 const Type **ftrue =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
579 ftrue[0] = Type::TOP;
580 ftrue[1] = Type::CONTROL;
581 TypeTuple::IFTRUE = TypeTuple::make( 2, ftrue );
582
583 const Type **floop =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
584 floop[0] = Type::CONTROL;
585 floop[1] = TypeInt::INT;
586 TypeTuple::LOOPBODY = TypeTuple::make( 2, floop );
587
588 TypePtr::NULL_PTR= TypePtr::make(AnyPtr, TypePtr::Null, Offset(0));
589 TypePtr::NOTNULL = TypePtr::make(AnyPtr, TypePtr::NotNull, Offset::bottom);
590 TypePtr::BOTTOM = TypePtr::make(AnyPtr, TypePtr::BotPTR, Offset::bottom);
591
592 TypeRawPtr::BOTTOM = TypeRawPtr::make( TypePtr::BotPTR );
593 TypeRawPtr::NOTNULL= TypeRawPtr::make( TypePtr::NotNull );
594
595 const Type **fmembar = TypeTuple::fields(0);
596 TypeTuple::MEMBAR = TypeTuple::make(TypeFunc::Parms+0, fmembar);
597
598 const Type **fsc = (const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
599 fsc[0] = TypeInt::CC;
600 fsc[1] = Type::MEMORY;
601 TypeTuple::STORECONDITIONAL = TypeTuple::make(2, fsc);
602
603 TypeInstPtr::NOTNULL = TypeInstPtr::make(TypePtr::NotNull, current->env()->Object_klass());
604 TypeInstPtr::BOTTOM = TypeInstPtr::make(TypePtr::BotPTR, current->env()->Object_klass());
605 TypeInstPtr::MIRROR = TypeInstPtr::make(TypePtr::NotNull, current->env()->Class_klass());
606 TypeInstPtr::MARK = TypeInstPtr::make(TypePtr::BotPTR, current->env()->Object_klass(),
607 false, 0, Offset(oopDesc::mark_offset_in_bytes()));
608 TypeInstPtr::KLASS = TypeInstPtr::make(TypePtr::BotPTR, current->env()->Object_klass(),
609 false, 0, Offset(oopDesc::klass_offset_in_bytes()));
610 TypeOopPtr::BOTTOM = TypeOopPtr::make(TypePtr::BotPTR, Offset::bottom, TypeOopPtr::InstanceBot);
611
612 TypeMetadataPtr::BOTTOM = TypeMetadataPtr::make(TypePtr::BotPTR, NULL, Offset::bottom);
613
614 TypeNarrowOop::NULL_PTR = TypeNarrowOop::make( TypePtr::NULL_PTR );
615 TypeNarrowOop::BOTTOM = TypeNarrowOop::make( TypeInstPtr::BOTTOM );
616
617 TypeNarrowKlass::NULL_PTR = TypeNarrowKlass::make( TypePtr::NULL_PTR );
618
619 mreg2type[Op_Node] = Type::BOTTOM;
620 mreg2type[Op_Set ] = 0;
621 mreg2type[Op_RegN] = TypeNarrowOop::BOTTOM;
622 mreg2type[Op_RegI] = TypeInt::INT;
623 mreg2type[Op_RegP] = TypePtr::BOTTOM;
624 mreg2type[Op_RegF] = Type::FLOAT;
625 mreg2type[Op_RegD] = Type::DOUBLE;
626 mreg2type[Op_RegL] = TypeLong::LONG;
627 mreg2type[Op_RegFlags] = TypeInt::CC;
628
629 TypeAryPtr::RANGE = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(Type::BOTTOM,TypeInt::POS), NULL /* current->env()->Object_klass() */, false, Offset(arrayOopDesc::length_offset_in_bytes()));
630
631 TypeAryPtr::NARROWOOPS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeNarrowOop::BOTTOM, TypeInt::POS), NULL /*ciArrayKlass::make(o)*/, false, Offset::bottom);
632
633 #ifdef _LP64
634 if (UseCompressedOops) {
635 assert(TypeAryPtr::NARROWOOPS->is_ptr_to_narrowoop(), "array of narrow oops must be ptr to narrow oop");
636 TypeAryPtr::OOPS = TypeAryPtr::NARROWOOPS;
637 } else
638 #endif
639 {
640 // There is no shared klass for Object[]. See note in TypeAryPtr::klass().
641 TypeAryPtr::OOPS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInstPtr::BOTTOM,TypeInt::POS), NULL /*ciArrayKlass::make(o)*/, false, Offset::bottom);
642 }
643 TypeAryPtr::BYTES = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInt::BYTE ,TypeInt::POS), ciTypeArrayKlass::make(T_BYTE), true, Offset::bottom);
644 TypeAryPtr::SHORTS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInt::SHORT ,TypeInt::POS), ciTypeArrayKlass::make(T_SHORT), true, Offset::bottom);
645 TypeAryPtr::CHARS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInt::CHAR ,TypeInt::POS), ciTypeArrayKlass::make(T_CHAR), true, Offset::bottom);
646 TypeAryPtr::INTS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInt::INT ,TypeInt::POS), ciTypeArrayKlass::make(T_INT), true, Offset::bottom);
647 TypeAryPtr::LONGS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeLong::LONG ,TypeInt::POS), ciTypeArrayKlass::make(T_LONG), true, Offset::bottom);
648 TypeAryPtr::FLOATS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(Type::FLOAT ,TypeInt::POS), ciTypeArrayKlass::make(T_FLOAT), true, Offset::bottom);
649 TypeAryPtr::DOUBLES = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(Type::DOUBLE ,TypeInt::POS), ciTypeArrayKlass::make(T_DOUBLE), true, Offset::bottom);
650
651 // Nobody should ask _array_body_type[T_NARROWOOP]. Use NULL as assert.
652 TypeAryPtr::_array_body_type[T_NARROWOOP] = NULL;
653 TypeAryPtr::_array_body_type[T_OBJECT] = TypeAryPtr::OOPS;
654 TypeAryPtr::_array_body_type[T_VALUETYPE] = TypeAryPtr::OOPS;
655 TypeAryPtr::_array_body_type[T_ARRAY] = TypeAryPtr::OOPS; // arrays are stored in oop arrays
656 TypeAryPtr::_array_body_type[T_BYTE] = TypeAryPtr::BYTES;
657 TypeAryPtr::_array_body_type[T_BOOLEAN] = TypeAryPtr::BYTES; // boolean[] is a byte array
658 TypeAryPtr::_array_body_type[T_SHORT] = TypeAryPtr::SHORTS;
659 TypeAryPtr::_array_body_type[T_CHAR] = TypeAryPtr::CHARS;
660 TypeAryPtr::_array_body_type[T_INT] = TypeAryPtr::INTS;
661 TypeAryPtr::_array_body_type[T_LONG] = TypeAryPtr::LONGS;
662 TypeAryPtr::_array_body_type[T_FLOAT] = TypeAryPtr::FLOATS;
663 TypeAryPtr::_array_body_type[T_DOUBLE] = TypeAryPtr::DOUBLES;
664
665 TypeKlassPtr::OBJECT = TypeKlassPtr::make(TypePtr::NotNull, current->env()->Object_klass(), Offset(0) );
666 TypeKlassPtr::OBJECT_OR_NULL = TypeKlassPtr::make(TypePtr::BotPTR, current->env()->Object_klass(), Offset(0) );
667
668 const Type **fi2c = TypeTuple::fields(2);
669 fi2c[TypeFunc::Parms+0] = TypeInstPtr::BOTTOM; // Method*
670 fi2c[TypeFunc::Parms+1] = TypeRawPtr::BOTTOM; // argument pointer
671 TypeTuple::START_I2C = TypeTuple::make(TypeFunc::Parms+2, fi2c);
672
673 const Type **intpair = TypeTuple::fields(2);
674 intpair[0] = TypeInt::INT;
675 intpair[1] = TypeInt::INT;
676 TypeTuple::INT_PAIR = TypeTuple::make(2, intpair);
677
678 const Type **longpair = TypeTuple::fields(2);
679 longpair[0] = TypeLong::LONG;
680 longpair[1] = TypeLong::LONG;
681 TypeTuple::LONG_PAIR = TypeTuple::make(2, longpair);
682
683 const Type **intccpair = TypeTuple::fields(2);
684 intccpair[0] = TypeInt::INT;
685 intccpair[1] = TypeInt::CC;
686 TypeTuple::INT_CC_PAIR = TypeTuple::make(2, intccpair);
687
688 const Type **longccpair = TypeTuple::fields(2);
689 longccpair[0] = TypeLong::LONG;
690 longccpair[1] = TypeInt::CC;
691 TypeTuple::LONG_CC_PAIR = TypeTuple::make(2, longccpair);
692
693 _const_basic_type[T_NARROWOOP] = TypeNarrowOop::BOTTOM;
694 _const_basic_type[T_NARROWKLASS] = Type::BOTTOM;
695 _const_basic_type[T_BOOLEAN] = TypeInt::BOOL;
696 _const_basic_type[T_CHAR] = TypeInt::CHAR;
697 _const_basic_type[T_BYTE] = TypeInt::BYTE;
698 _const_basic_type[T_SHORT] = TypeInt::SHORT;
699 _const_basic_type[T_INT] = TypeInt::INT;
700 _const_basic_type[T_LONG] = TypeLong::LONG;
701 _const_basic_type[T_FLOAT] = Type::FLOAT;
702 _const_basic_type[T_DOUBLE] = Type::DOUBLE;
703 _const_basic_type[T_OBJECT] = TypeInstPtr::BOTTOM;
704 _const_basic_type[T_ARRAY] = TypeInstPtr::BOTTOM; // there is no separate bottom for arrays
705 _const_basic_type[T_VALUETYPE] = TypeInstPtr::BOTTOM;
706 _const_basic_type[T_VOID] = TypePtr::NULL_PTR; // reflection represents void this way
707 _const_basic_type[T_ADDRESS] = TypeRawPtr::BOTTOM; // both interpreter return addresses & random raw ptrs
708 _const_basic_type[T_CONFLICT] = Type::BOTTOM; // why not?
709
710 _zero_type[T_NARROWOOP] = TypeNarrowOop::NULL_PTR;
711 _zero_type[T_NARROWKLASS] = TypeNarrowKlass::NULL_PTR;
712 _zero_type[T_BOOLEAN] = TypeInt::ZERO; // false == 0
713 _zero_type[T_CHAR] = TypeInt::ZERO; // '\0' == 0
714 _zero_type[T_BYTE] = TypeInt::ZERO; // 0x00 == 0
715 _zero_type[T_SHORT] = TypeInt::ZERO; // 0x0000 == 0
716 _zero_type[T_INT] = TypeInt::ZERO;
717 _zero_type[T_LONG] = TypeLong::ZERO;
718 _zero_type[T_FLOAT] = TypeF::ZERO;
719 _zero_type[T_DOUBLE] = TypeD::ZERO;
720 _zero_type[T_OBJECT] = TypePtr::NULL_PTR;
721 _zero_type[T_ARRAY] = TypePtr::NULL_PTR; // null array is null oop
722 _zero_type[T_VALUETYPE] = TypePtr::NULL_PTR;
723 _zero_type[T_ADDRESS] = TypePtr::NULL_PTR; // raw pointers use the same null
724 _zero_type[T_VOID] = Type::TOP; // the only void value is no value at all
725
726 // get_zero_type() should not happen for T_CONFLICT
727 _zero_type[T_CONFLICT]= NULL;
728
729 // Vector predefined types, it needs initialized _const_basic_type[].
730 if (Matcher::vector_size_supported(T_BYTE,4)) {
731 TypeVect::VECTS = TypeVect::make(T_BYTE,4);
732 }
733 if (Matcher::vector_size_supported(T_FLOAT,2)) {
734 TypeVect::VECTD = TypeVect::make(T_FLOAT,2);
735 }
736 if (Matcher::vector_size_supported(T_FLOAT,4)) {
737 TypeVect::VECTX = TypeVect::make(T_FLOAT,4);
738 }
739 if (Matcher::vector_size_supported(T_FLOAT,8)) {
740 TypeVect::VECTY = TypeVect::make(T_FLOAT,8);
741 }
742 if (Matcher::vector_size_supported(T_FLOAT,16)) {
743 TypeVect::VECTZ = TypeVect::make(T_FLOAT,16);
744 }
745 mreg2type[Op_VecS] = TypeVect::VECTS;
746 mreg2type[Op_VecD] = TypeVect::VECTD;
747 mreg2type[Op_VecX] = TypeVect::VECTX;
748 mreg2type[Op_VecY] = TypeVect::VECTY;
749 mreg2type[Op_VecZ] = TypeVect::VECTZ;
750
751 // Restore working type arena.
752 current->set_type_arena(save);
753 current->set_type_dict(NULL);
754 }
755
756 //------------------------------Initialize-------------------------------------
757 void Type::Initialize(Compile* current) {
758 assert(current->type_arena() != NULL, "must have created type arena");
759
760 if (_shared_type_dict == NULL) {
761 Initialize_shared(current);
762 }
763
764 Arena* type_arena = current->type_arena();
765
766 // Create the hash-cons'ing dictionary with top-level storage allocation
767 Dict *tdic = new (type_arena) Dict( (CmpKey)Type::cmp,(Hash)Type::uhash, type_arena, 128 );
768 current->set_type_dict(tdic);
769
770 // Transfer the shared types.
771 DictI i(_shared_type_dict);
772 for( ; i.test(); ++i ) {
773 Type* t = (Type*)i._value;
774 tdic->Insert(t,t); // New Type, insert into Type table
775 }
776 }
777
778 //------------------------------hashcons---------------------------------------
779 // Do the hash-cons trick. If the Type already exists in the type table,
780 // delete the current Type and return the existing Type. Otherwise stick the
781 // current Type in the Type table.
782 const Type *Type::hashcons(void) {
783 debug_only(base()); // Check the assertion in Type::base().
784 // Look up the Type in the Type dictionary
785 Dict *tdic = type_dict();
786 Type* old = (Type*)(tdic->Insert(this, this, false));
787 if( old ) { // Pre-existing Type?
788 if( old != this ) // Yes, this guy is not the pre-existing?
789 delete this; // Yes, Nuke this guy
790 assert( old->_dual, "" );
791 return old; // Return pre-existing
792 }
793
794 // Every type has a dual (to make my lattice symmetric).
795 // Since we just discovered a new Type, compute its dual right now.
796 assert( !_dual, "" ); // No dual yet
797 _dual = xdual(); // Compute the dual
798 if( cmp(this,_dual)==0 ) { // Handle self-symmetric
799 _dual = this;
800 return this;
801 }
802 assert( !_dual->_dual, "" ); // No reverse dual yet
803 assert( !(*tdic)[_dual], "" ); // Dual not in type system either
804 // New Type, insert into Type table
805 tdic->Insert((void*)_dual,(void*)_dual);
806 ((Type*)_dual)->_dual = this; // Finish up being symmetric
807 #ifdef ASSERT
808 Type *dual_dual = (Type*)_dual->xdual();
809 assert( eq(dual_dual), "xdual(xdual()) should be identity" );
810 delete dual_dual;
811 #endif
812 return this; // Return new Type
813 }
814
815 //------------------------------eq---------------------------------------------
816 // Structural equality check for Type representations
817 bool Type::eq( const Type * ) const {
818 return true; // Nothing else can go wrong
819 }
820
821 //------------------------------hash-------------------------------------------
822 // Type-specific hashing function.
823 int Type::hash(void) const {
824 return _base;
825 }
826
827 //------------------------------is_finite--------------------------------------
828 // Has a finite value
829 bool Type::is_finite() const {
830 return false;
831 }
832
833 //------------------------------is_nan-----------------------------------------
834 // Is not a number (NaN)
835 bool Type::is_nan() const {
836 return false;
837 }
838
839 //----------------------interface_vs_oop---------------------------------------
840 #ifdef ASSERT
841 bool Type::interface_vs_oop_helper(const Type *t) const {
842 bool result = false;
843
844 const TypePtr* this_ptr = this->make_ptr(); // In case it is narrow_oop
845 const TypePtr* t_ptr = t->make_ptr();
846 if( this_ptr == NULL || t_ptr == NULL )
847 return result;
848
849 const TypeInstPtr* this_inst = this_ptr->isa_instptr();
850 const TypeInstPtr* t_inst = t_ptr->isa_instptr();
851 if( this_inst && this_inst->is_loaded() && t_inst && t_inst->is_loaded() ) {
852 bool this_interface = this_inst->klass()->is_interface();
853 bool t_interface = t_inst->klass()->is_interface();
854 result = this_interface ^ t_interface;
855 }
856
857 return result;
858 }
859
860 bool Type::interface_vs_oop(const Type *t) const {
861 if (interface_vs_oop_helper(t)) {
862 return true;
863 }
864 // Now check the speculative parts as well
865 const TypePtr* this_spec = isa_ptr() != NULL ? is_ptr()->speculative() : NULL;
866 const TypePtr* t_spec = t->isa_ptr() != NULL ? t->is_ptr()->speculative() : NULL;
867 if (this_spec != NULL && t_spec != NULL) {
868 if (this_spec->interface_vs_oop_helper(t_spec)) {
869 return true;
870 }
871 return false;
872 }
873 if (this_spec != NULL && this_spec->interface_vs_oop_helper(t)) {
874 return true;
875 }
876 if (t_spec != NULL && interface_vs_oop_helper(t_spec)) {
877 return true;
878 }
879 return false;
880 }
881
882 #endif
883
884 //------------------------------meet-------------------------------------------
885 // Compute the MEET of two types. NOT virtual. It enforces that meet is
886 // commutative and the lattice is symmetric.
887 const Type *Type::meet_helper(const Type *t, bool include_speculative) const {
888 if (isa_narrowoop() && t->isa_narrowoop()) {
889 const Type* result = make_ptr()->meet_helper(t->make_ptr(), include_speculative);
890 return result->make_narrowoop();
891 }
892 if (isa_narrowklass() && t->isa_narrowklass()) {
893 const Type* result = make_ptr()->meet_helper(t->make_ptr(), include_speculative);
894 return result->make_narrowklass();
895 }
896
897 const Type *this_t = maybe_remove_speculative(include_speculative);
898 t = t->maybe_remove_speculative(include_speculative);
899
900 const Type *mt = this_t->xmeet(t);
901 if (isa_narrowoop() || t->isa_narrowoop()) return mt;
902 if (isa_narrowklass() || t->isa_narrowklass()) return mt;
903 #ifdef ASSERT
904 assert(mt == t->xmeet(this_t), "meet not commutative");
905 const Type* dual_join = mt->_dual;
906 const Type *t2t = dual_join->xmeet(t->_dual);
907 const Type *t2this = dual_join->xmeet(this_t->_dual);
908
909 // Interface meet Oop is Not Symmetric:
910 // Interface:AnyNull meet Oop:AnyNull == Interface:AnyNull
911 // Interface:NotNull meet Oop:NotNull == java/lang/Object:NotNull
912
913 if( !interface_vs_oop(t) && (t2t != t->_dual || t2this != this_t->_dual) ) {
914 tty->print_cr("=== Meet Not Symmetric ===");
915 tty->print("t = "); t->dump(); tty->cr();
916 tty->print("this= "); this_t->dump(); tty->cr();
917 tty->print("mt=(t meet this)= "); mt->dump(); tty->cr();
918
919 tty->print("t_dual= "); t->_dual->dump(); tty->cr();
920 tty->print("this_dual= "); this_t->_dual->dump(); tty->cr();
921 tty->print("mt_dual= "); mt->_dual->dump(); tty->cr();
922
923 tty->print("mt_dual meet t_dual= "); t2t ->dump(); tty->cr();
924 tty->print("mt_dual meet this_dual= "); t2this ->dump(); tty->cr();
925
926 fatal("meet not symmetric" );
927 }
928 #endif
929 return mt;
930 }
931
932 //------------------------------xmeet------------------------------------------
933 // Compute the MEET of two types. It returns a new Type object.
934 const Type *Type::xmeet( const Type *t ) const {
935 // Perform a fast test for common case; meeting the same types together.
936 if( this == t ) return this; // Meeting same type-rep?
937
938 // Meeting TOP with anything?
939 if( _base == Top ) return t;
940
941 // Meeting BOTTOM with anything?
942 if( _base == Bottom ) return BOTTOM;
943
944 // Current "this->_base" is one of: Bad, Multi, Control, Top,
945 // Abio, Abstore, Floatxxx, Doublexxx, Bottom, lastype.
946 switch (t->base()) { // Switch on original type
947
948 // Cut in half the number of cases I must handle. Only need cases for when
949 // the given enum "t->type" is less than or equal to the local enum "type".
950 case FloatCon:
951 case DoubleCon:
952 case Int:
953 case Long:
954 return t->xmeet(this);
955
956 case OopPtr:
957 return t->xmeet(this);
958
959 case InstPtr:
960 return t->xmeet(this);
961
962 case MetadataPtr:
963 case KlassPtr:
964 return t->xmeet(this);
965
966 case AryPtr:
967 return t->xmeet(this);
968
969 case NarrowOop:
970 return t->xmeet(this);
971
972 case NarrowKlass:
973 return t->xmeet(this);
974
975 case ValueType:
976 return t->xmeet(this);
977
978 case Bad: // Type check
979 default: // Bogus type not in lattice
980 typerr(t);
981 return Type::BOTTOM;
982
983 case Bottom: // Ye Olde Default
984 return t;
985
986 case FloatTop:
987 if( _base == FloatTop ) return this;
988 case FloatBot: // Float
989 if( _base == FloatBot || _base == FloatTop ) return FLOAT;
990 if( _base == DoubleTop || _base == DoubleBot ) return Type::BOTTOM;
991 typerr(t);
992 return Type::BOTTOM;
993
994 case DoubleTop:
995 if( _base == DoubleTop ) return this;
996 case DoubleBot: // Double
997 if( _base == DoubleBot || _base == DoubleTop ) return DOUBLE;
998 if( _base == FloatTop || _base == FloatBot ) return Type::BOTTOM;
999 typerr(t);
1000 return Type::BOTTOM;
1001
1002 // These next few cases must match exactly or it is a compile-time error.
1003 case Control: // Control of code
1004 case Abio: // State of world outside of program
1005 case Memory:
1006 if( _base == t->_base ) return this;
1007 typerr(t);
1008 return Type::BOTTOM;
1009
1010 case Top: // Top of the lattice
1011 return this;
1012 }
1013
1014 // The type is unchanged
1015 return this;
1016 }
1017
1018 //-----------------------------filter------------------------------------------
1019 const Type *Type::filter_helper(const Type *kills, bool include_speculative) const {
1020 const Type* ft = join_helper(kills, include_speculative);
1021 if (ft->empty())
1022 return Type::TOP; // Canonical empty value
1023 return ft;
1024 }
1025
1026 //------------------------------xdual------------------------------------------
1027 // Compute dual right now.
1028 const Type::TYPES Type::dual_type[Type::lastype] = {
1029 Bad, // Bad
1030 Control, // Control
1031 Bottom, // Top
1032 Bad, // Int - handled in v-call
1033 Bad, // Long - handled in v-call
1034 Half, // Half
1035 Bad, // NarrowOop - handled in v-call
1036 Bad, // NarrowKlass - handled in v-call
1037
1038 Bad, // Tuple - handled in v-call
1039 Bad, // Array - handled in v-call
1040 Bad, // VectorS - handled in v-call
1041 Bad, // VectorD - handled in v-call
1042 Bad, // VectorX - handled in v-call
1043 Bad, // VectorY - handled in v-call
1044 Bad, // VectorZ - handled in v-call
1045 Bad, // ValueType - handled in v-call
1046
1047 Bad, // AnyPtr - handled in v-call
1048 Bad, // RawPtr - handled in v-call
1049 Bad, // OopPtr - handled in v-call
1050 Bad, // InstPtr - handled in v-call
1051 Bad, // AryPtr - handled in v-call
1052
1053 Bad, // MetadataPtr - handled in v-call
1054 Bad, // KlassPtr - handled in v-call
1055
1056 Bad, // Function - handled in v-call
1057 Abio, // Abio
1058 Return_Address,// Return_Address
1059 Memory, // Memory
1060 FloatBot, // FloatTop
1061 FloatCon, // FloatCon
1062 FloatTop, // FloatBot
1063 DoubleBot, // DoubleTop
1064 DoubleCon, // DoubleCon
1065 DoubleTop, // DoubleBot
1066 Top // Bottom
1067 };
1068
1069 const Type *Type::xdual() const {
1070 // Note: the base() accessor asserts the sanity of _base.
1071 assert(_type_info[base()].dual_type != Bad, "implement with v-call");
1072 return new Type(_type_info[_base].dual_type);
1073 }
1074
1075 //------------------------------has_memory-------------------------------------
1076 bool Type::has_memory() const {
1077 Type::TYPES tx = base();
1078 if (tx == Memory) return true;
1079 if (tx == Tuple) {
1080 const TypeTuple *t = is_tuple();
1081 for (uint i=0; i < t->cnt(); i++) {
1082 tx = t->field_at(i)->base();
1083 if (tx == Memory) return true;
1084 }
1085 }
1086 return false;
1087 }
1088
1089 #ifndef PRODUCT
1090 //------------------------------dump2------------------------------------------
1091 void Type::dump2( Dict &d, uint depth, outputStream *st ) const {
1092 st->print("%s", _type_info[_base].msg);
1093 }
1094
1095 //------------------------------dump-------------------------------------------
1096 void Type::dump_on(outputStream *st) const {
1097 ResourceMark rm;
1098 Dict d(cmpkey,hashkey); // Stop recursive type dumping
1099 dump2(d,1, st);
1100 if (is_ptr_to_narrowoop()) {
1101 st->print(" [narrow]");
1102 } else if (is_ptr_to_narrowklass()) {
1103 st->print(" [narrowklass]");
1104 }
1105 }
1106
1107 //-----------------------------------------------------------------------------
1108 const char* Type::str(const Type* t) {
1109 stringStream ss;
1110 t->dump_on(&ss);
1111 return ss.as_string();
1112 }
1113 #endif
1114
1115 //------------------------------singleton--------------------------------------
1116 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1117 // constants (Ldi nodes). Singletons are integer, float or double constants.
1118 bool Type::singleton(void) const {
1119 return _base == Top || _base == Half;
1120 }
1121
1122 //------------------------------empty------------------------------------------
1123 // TRUE if Type is a type with no values, FALSE otherwise.
1124 bool Type::empty(void) const {
1125 switch (_base) {
1126 case DoubleTop:
1127 case FloatTop:
1128 case Top:
1129 return true;
1130
1131 case Half:
1132 case Abio:
1133 case Return_Address:
1134 case Memory:
1135 case Bottom:
1136 case FloatBot:
1137 case DoubleBot:
1138 return false; // never a singleton, therefore never empty
1139
1140 default:
1141 ShouldNotReachHere();
1142 return false;
1143 }
1144 }
1145
1146 //------------------------------dump_stats-------------------------------------
1147 // Dump collected statistics to stderr
1148 #ifndef PRODUCT
1149 void Type::dump_stats() {
1150 tty->print("Types made: %d\n", type_dict()->Size());
1151 }
1152 #endif
1153
1154 //------------------------------typerr-----------------------------------------
1155 void Type::typerr( const Type *t ) const {
1156 #ifndef PRODUCT
1157 tty->print("\nError mixing types: ");
1158 dump();
1159 tty->print(" and ");
1160 t->dump();
1161 tty->print("\n");
1162 #endif
1163 ShouldNotReachHere();
1164 }
1165
1166
1167 //=============================================================================
1168 // Convenience common pre-built types.
1169 const TypeF *TypeF::ZERO; // Floating point zero
1170 const TypeF *TypeF::ONE; // Floating point one
1171 const TypeF *TypeF::POS_INF; // Floating point positive infinity
1172 const TypeF *TypeF::NEG_INF; // Floating point negative infinity
1173
1174 //------------------------------make-------------------------------------------
1175 // Create a float constant
1176 const TypeF *TypeF::make(float f) {
1177 return (TypeF*)(new TypeF(f))->hashcons();
1178 }
1179
1180 //------------------------------meet-------------------------------------------
1181 // Compute the MEET of two types. It returns a new Type object.
1182 const Type *TypeF::xmeet( const Type *t ) const {
1183 // Perform a fast test for common case; meeting the same types together.
1184 if( this == t ) return this; // Meeting same type-rep?
1185
1186 // Current "this->_base" is FloatCon
1187 switch (t->base()) { // Switch on original type
1188 case AnyPtr: // Mixing with oops happens when javac
1189 case RawPtr: // reuses local variables
1190 case OopPtr:
1191 case InstPtr:
1192 case AryPtr:
1193 case MetadataPtr:
1194 case KlassPtr:
1195 case NarrowOop:
1196 case NarrowKlass:
1197 case Int:
1198 case Long:
1199 case DoubleTop:
1200 case DoubleCon:
1201 case DoubleBot:
1202 case Bottom: // Ye Olde Default
1203 return Type::BOTTOM;
1204
1205 case FloatBot:
1206 return t;
1207
1208 default: // All else is a mistake
1209 typerr(t);
1210
1211 case FloatCon: // Float-constant vs Float-constant?
1212 if( jint_cast(_f) != jint_cast(t->getf()) ) // unequal constants?
1213 // must compare bitwise as positive zero, negative zero and NaN have
1214 // all the same representation in C++
1215 return FLOAT; // Return generic float
1216 // Equal constants
1217 case Top:
1218 case FloatTop:
1219 break; // Return the float constant
1220 }
1221 return this; // Return the float constant
1222 }
1223
1224 //------------------------------xdual------------------------------------------
1225 // Dual: symmetric
1226 const Type *TypeF::xdual() const {
1227 return this;
1228 }
1229
1230 //------------------------------eq---------------------------------------------
1231 // Structural equality check for Type representations
1232 bool TypeF::eq(const Type *t) const {
1233 // Bitwise comparison to distinguish between +/-0. These values must be treated
1234 // as different to be consistent with C1 and the interpreter.
1235 return (jint_cast(_f) == jint_cast(t->getf()));
1236 }
1237
1238 //------------------------------hash-------------------------------------------
1239 // Type-specific hashing function.
1240 int TypeF::hash(void) const {
1241 return *(int*)(&_f);
1242 }
1243
1244 //------------------------------is_finite--------------------------------------
1245 // Has a finite value
1246 bool TypeF::is_finite() const {
1247 return g_isfinite(getf()) != 0;
1248 }
1249
1250 //------------------------------is_nan-----------------------------------------
1251 // Is not a number (NaN)
1252 bool TypeF::is_nan() const {
1253 return g_isnan(getf()) != 0;
1254 }
1255
1256 //------------------------------dump2------------------------------------------
1257 // Dump float constant Type
1258 #ifndef PRODUCT
1259 void TypeF::dump2( Dict &d, uint depth, outputStream *st ) const {
1260 Type::dump2(d,depth, st);
1261 st->print("%f", _f);
1262 }
1263 #endif
1264
1265 //------------------------------singleton--------------------------------------
1266 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1267 // constants (Ldi nodes). Singletons are integer, float or double constants
1268 // or a single symbol.
1269 bool TypeF::singleton(void) const {
1270 return true; // Always a singleton
1271 }
1272
1273 bool TypeF::empty(void) const {
1274 return false; // always exactly a singleton
1275 }
1276
1277 //=============================================================================
1278 // Convenience common pre-built types.
1279 const TypeD *TypeD::ZERO; // Floating point zero
1280 const TypeD *TypeD::ONE; // Floating point one
1281 const TypeD *TypeD::POS_INF; // Floating point positive infinity
1282 const TypeD *TypeD::NEG_INF; // Floating point negative infinity
1283
1284 //------------------------------make-------------------------------------------
1285 const TypeD *TypeD::make(double d) {
1286 return (TypeD*)(new TypeD(d))->hashcons();
1287 }
1288
1289 //------------------------------meet-------------------------------------------
1290 // Compute the MEET of two types. It returns a new Type object.
1291 const Type *TypeD::xmeet( const Type *t ) const {
1292 // Perform a fast test for common case; meeting the same types together.
1293 if( this == t ) return this; // Meeting same type-rep?
1294
1295 // Current "this->_base" is DoubleCon
1296 switch (t->base()) { // Switch on original type
1297 case AnyPtr: // Mixing with oops happens when javac
1298 case RawPtr: // reuses local variables
1299 case OopPtr:
1300 case InstPtr:
1301 case AryPtr:
1302 case MetadataPtr:
1303 case KlassPtr:
1304 case NarrowOop:
1305 case NarrowKlass:
1306 case Int:
1307 case Long:
1308 case FloatTop:
1309 case FloatCon:
1310 case FloatBot:
1311 case Bottom: // Ye Olde Default
1312 return Type::BOTTOM;
1313
1314 case DoubleBot:
1315 return t;
1316
1317 default: // All else is a mistake
1318 typerr(t);
1319
1320 case DoubleCon: // Double-constant vs Double-constant?
1321 if( jlong_cast(_d) != jlong_cast(t->getd()) ) // unequal constants? (see comment in TypeF::xmeet)
1322 return DOUBLE; // Return generic double
1323 case Top:
1324 case DoubleTop:
1325 break;
1326 }
1327 return this; // Return the double constant
1328 }
1329
1330 //------------------------------xdual------------------------------------------
1331 // Dual: symmetric
1332 const Type *TypeD::xdual() const {
1333 return this;
1334 }
1335
1336 //------------------------------eq---------------------------------------------
1337 // Structural equality check for Type representations
1338 bool TypeD::eq(const Type *t) const {
1339 // Bitwise comparison to distinguish between +/-0. These values must be treated
1340 // as different to be consistent with C1 and the interpreter.
1341 return (jlong_cast(_d) == jlong_cast(t->getd()));
1342 }
1343
1344 //------------------------------hash-------------------------------------------
1345 // Type-specific hashing function.
1346 int TypeD::hash(void) const {
1347 return *(int*)(&_d);
1348 }
1349
1350 //------------------------------is_finite--------------------------------------
1351 // Has a finite value
1352 bool TypeD::is_finite() const {
1353 return g_isfinite(getd()) != 0;
1354 }
1355
1356 //------------------------------is_nan-----------------------------------------
1357 // Is not a number (NaN)
1358 bool TypeD::is_nan() const {
1359 return g_isnan(getd()) != 0;
1360 }
1361
1362 //------------------------------dump2------------------------------------------
1363 // Dump double constant Type
1364 #ifndef PRODUCT
1365 void TypeD::dump2( Dict &d, uint depth, outputStream *st ) const {
1366 Type::dump2(d,depth,st);
1367 st->print("%f", _d);
1368 }
1369 #endif
1370
1371 //------------------------------singleton--------------------------------------
1372 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1373 // constants (Ldi nodes). Singletons are integer, float or double constants
1374 // or a single symbol.
1375 bool TypeD::singleton(void) const {
1376 return true; // Always a singleton
1377 }
1378
1379 bool TypeD::empty(void) const {
1380 return false; // always exactly a singleton
1381 }
1382
1383 //=============================================================================
1384 // Convience common pre-built types.
1385 const TypeInt *TypeInt::MINUS_1;// -1
1386 const TypeInt *TypeInt::ZERO; // 0
1387 const TypeInt *TypeInt::ONE; // 1
1388 const TypeInt *TypeInt::BOOL; // 0 or 1, FALSE or TRUE.
1389 const TypeInt *TypeInt::CC; // -1,0 or 1, condition codes
1390 const TypeInt *TypeInt::CC_LT; // [-1] == MINUS_1
1391 const TypeInt *TypeInt::CC_GT; // [1] == ONE
1392 const TypeInt *TypeInt::CC_EQ; // [0] == ZERO
1393 const TypeInt *TypeInt::CC_LE; // [-1,0]
1394 const TypeInt *TypeInt::CC_GE; // [0,1] == BOOL (!)
1395 const TypeInt *TypeInt::BYTE; // Bytes, -128 to 127
1396 const TypeInt *TypeInt::UBYTE; // Unsigned Bytes, 0 to 255
1397 const TypeInt *TypeInt::CHAR; // Java chars, 0-65535
1398 const TypeInt *TypeInt::SHORT; // Java shorts, -32768-32767
1399 const TypeInt *TypeInt::POS; // Positive 32-bit integers or zero
1400 const TypeInt *TypeInt::POS1; // Positive 32-bit integers
1401 const TypeInt *TypeInt::INT; // 32-bit integers
1402 const TypeInt *TypeInt::SYMINT; // symmetric range [-max_jint..max_jint]
1403 const TypeInt *TypeInt::TYPE_DOMAIN; // alias for TypeInt::INT
1404
1405 //------------------------------TypeInt----------------------------------------
1406 TypeInt::TypeInt( jint lo, jint hi, int w ) : Type(Int), _lo(lo), _hi(hi), _widen(w) {
1407 }
1408
1409 //------------------------------make-------------------------------------------
1410 const TypeInt *TypeInt::make( jint lo ) {
1411 return (TypeInt*)(new TypeInt(lo,lo,WidenMin))->hashcons();
1412 }
1413
1414 static int normalize_int_widen( jint lo, jint hi, int w ) {
1415 // Certain normalizations keep us sane when comparing types.
1416 // The 'SMALLINT' covers constants and also CC and its relatives.
1417 if (lo <= hi) {
1418 if (((juint)hi - lo) <= SMALLINT) w = Type::WidenMin;
1419 if (((juint)hi - lo) >= max_juint) w = Type::WidenMax; // TypeInt::INT
1420 } else {
1421 if (((juint)lo - hi) <= SMALLINT) w = Type::WidenMin;
1422 if (((juint)lo - hi) >= max_juint) w = Type::WidenMin; // dual TypeInt::INT
1423 }
1424 return w;
1425 }
1426
1427 const TypeInt *TypeInt::make( jint lo, jint hi, int w ) {
1428 w = normalize_int_widen(lo, hi, w);
1429 return (TypeInt*)(new TypeInt(lo,hi,w))->hashcons();
1430 }
1431
1432 //------------------------------meet-------------------------------------------
1433 // Compute the MEET of two types. It returns a new Type representation object
1434 // with reference count equal to the number of Types pointing at it.
1435 // Caller should wrap a Types around it.
1436 const Type *TypeInt::xmeet( const Type *t ) const {
1437 // Perform a fast test for common case; meeting the same types together.
1438 if( this == t ) return this; // Meeting same type?
1439
1440 // Currently "this->_base" is a TypeInt
1441 switch (t->base()) { // Switch on original type
1442 case AnyPtr: // Mixing with oops happens when javac
1443 case RawPtr: // reuses local variables
1444 case OopPtr:
1445 case InstPtr:
1446 case AryPtr:
1447 case MetadataPtr:
1448 case KlassPtr:
1449 case NarrowOop:
1450 case NarrowKlass:
1451 case Long:
1452 case FloatTop:
1453 case FloatCon:
1454 case FloatBot:
1455 case DoubleTop:
1456 case DoubleCon:
1457 case DoubleBot:
1458 case Bottom: // Ye Olde Default
1459 return Type::BOTTOM;
1460 default: // All else is a mistake
1461 typerr(t);
1462 case Top: // No change
1463 return this;
1464 case Int: // Int vs Int?
1465 break;
1466 }
1467
1468 // Expand covered set
1469 const TypeInt *r = t->is_int();
1470 return make( MIN2(_lo,r->_lo), MAX2(_hi,r->_hi), MAX2(_widen,r->_widen) );
1471 }
1472
1473 //------------------------------xdual------------------------------------------
1474 // Dual: reverse hi & lo; flip widen
1475 const Type *TypeInt::xdual() const {
1476 int w = normalize_int_widen(_hi,_lo, WidenMax-_widen);
1477 return new TypeInt(_hi,_lo,w);
1478 }
1479
1480 //------------------------------widen------------------------------------------
1481 // Only happens for optimistic top-down optimizations.
1482 const Type *TypeInt::widen( const Type *old, const Type* limit ) const {
1483 // Coming from TOP or such; no widening
1484 if( old->base() != Int ) return this;
1485 const TypeInt *ot = old->is_int();
1486
1487 // If new guy is equal to old guy, no widening
1488 if( _lo == ot->_lo && _hi == ot->_hi )
1489 return old;
1490
1491 // If new guy contains old, then we widened
1492 if( _lo <= ot->_lo && _hi >= ot->_hi ) {
1493 // New contains old
1494 // If new guy is already wider than old, no widening
1495 if( _widen > ot->_widen ) return this;
1496 // If old guy was a constant, do not bother
1497 if (ot->_lo == ot->_hi) return this;
1498 // Now widen new guy.
1499 // Check for widening too far
1500 if (_widen == WidenMax) {
1501 int max = max_jint;
1502 int min = min_jint;
1503 if (limit->isa_int()) {
1504 max = limit->is_int()->_hi;
1505 min = limit->is_int()->_lo;
1506 }
1507 if (min < _lo && _hi < max) {
1508 // If neither endpoint is extremal yet, push out the endpoint
1509 // which is closer to its respective limit.
1510 if (_lo >= 0 || // easy common case
1511 (juint)(_lo - min) >= (juint)(max - _hi)) {
1512 // Try to widen to an unsigned range type of 31 bits:
1513 return make(_lo, max, WidenMax);
1514 } else {
1515 return make(min, _hi, WidenMax);
1516 }
1517 }
1518 return TypeInt::INT;
1519 }
1520 // Returned widened new guy
1521 return make(_lo,_hi,_widen+1);
1522 }
1523
1524 // If old guy contains new, then we probably widened too far & dropped to
1525 // bottom. Return the wider fellow.
1526 if ( ot->_lo <= _lo && ot->_hi >= _hi )
1527 return old;
1528
1529 //fatal("Integer value range is not subset");
1530 //return this;
1531 return TypeInt::INT;
1532 }
1533
1534 //------------------------------narrow---------------------------------------
1535 // Only happens for pessimistic optimizations.
1536 const Type *TypeInt::narrow( const Type *old ) const {
1537 if (_lo >= _hi) return this; // already narrow enough
1538 if (old == NULL) return this;
1539 const TypeInt* ot = old->isa_int();
1540 if (ot == NULL) return this;
1541 jint olo = ot->_lo;
1542 jint ohi = ot->_hi;
1543
1544 // If new guy is equal to old guy, no narrowing
1545 if (_lo == olo && _hi == ohi) return old;
1546
1547 // If old guy was maximum range, allow the narrowing
1548 if (olo == min_jint && ohi == max_jint) return this;
1549
1550 if (_lo < olo || _hi > ohi)
1551 return this; // doesn't narrow; pretty wierd
1552
1553 // The new type narrows the old type, so look for a "death march".
1554 // See comments on PhaseTransform::saturate.
1555 juint nrange = (juint)_hi - _lo;
1556 juint orange = (juint)ohi - olo;
1557 if (nrange < max_juint - 1 && nrange > (orange >> 1) + (SMALLINT*2)) {
1558 // Use the new type only if the range shrinks a lot.
1559 // We do not want the optimizer computing 2^31 point by point.
1560 return old;
1561 }
1562
1563 return this;
1564 }
1565
1566 //-----------------------------filter------------------------------------------
1567 const Type *TypeInt::filter_helper(const Type *kills, bool include_speculative) const {
1568 const TypeInt* ft = join_helper(kills, include_speculative)->isa_int();
1569 if (ft == NULL || ft->empty())
1570 return Type::TOP; // Canonical empty value
1571 if (ft->_widen < this->_widen) {
1572 // Do not allow the value of kill->_widen to affect the outcome.
1573 // The widen bits must be allowed to run freely through the graph.
1574 ft = TypeInt::make(ft->_lo, ft->_hi, this->_widen);
1575 }
1576 return ft;
1577 }
1578
1579 //------------------------------eq---------------------------------------------
1580 // Structural equality check for Type representations
1581 bool TypeInt::eq( const Type *t ) const {
1582 const TypeInt *r = t->is_int(); // Handy access
1583 return r->_lo == _lo && r->_hi == _hi && r->_widen == _widen;
1584 }
1585
1586 //------------------------------hash-------------------------------------------
1587 // Type-specific hashing function.
1588 int TypeInt::hash(void) const {
1589 return java_add(java_add(_lo, _hi), java_add((jint)_widen, (jint)Type::Int));
1590 }
1591
1592 //------------------------------is_finite--------------------------------------
1593 // Has a finite value
1594 bool TypeInt::is_finite() const {
1595 return true;
1596 }
1597
1598 //------------------------------dump2------------------------------------------
1599 // Dump TypeInt
1600 #ifndef PRODUCT
1601 static const char* intname(char* buf, jint n) {
1602 if (n == min_jint)
1603 return "min";
1604 else if (n < min_jint + 10000)
1605 sprintf(buf, "min+" INT32_FORMAT, n - min_jint);
1606 else if (n == max_jint)
1607 return "max";
1608 else if (n > max_jint - 10000)
1609 sprintf(buf, "max-" INT32_FORMAT, max_jint - n);
1610 else
1611 sprintf(buf, INT32_FORMAT, n);
1612 return buf;
1613 }
1614
1615 void TypeInt::dump2( Dict &d, uint depth, outputStream *st ) const {
1616 char buf[40], buf2[40];
1617 if (_lo == min_jint && _hi == max_jint)
1618 st->print("int");
1619 else if (is_con())
1620 st->print("int:%s", intname(buf, get_con()));
1621 else if (_lo == BOOL->_lo && _hi == BOOL->_hi)
1622 st->print("bool");
1623 else if (_lo == BYTE->_lo && _hi == BYTE->_hi)
1624 st->print("byte");
1625 else if (_lo == CHAR->_lo && _hi == CHAR->_hi)
1626 st->print("char");
1627 else if (_lo == SHORT->_lo && _hi == SHORT->_hi)
1628 st->print("short");
1629 else if (_hi == max_jint)
1630 st->print("int:>=%s", intname(buf, _lo));
1631 else if (_lo == min_jint)
1632 st->print("int:<=%s", intname(buf, _hi));
1633 else
1634 st->print("int:%s..%s", intname(buf, _lo), intname(buf2, _hi));
1635
1636 if (_widen != 0 && this != TypeInt::INT)
1637 st->print(":%.*s", _widen, "wwww");
1638 }
1639 #endif
1640
1641 //------------------------------singleton--------------------------------------
1642 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1643 // constants.
1644 bool TypeInt::singleton(void) const {
1645 return _lo >= _hi;
1646 }
1647
1648 bool TypeInt::empty(void) const {
1649 return _lo > _hi;
1650 }
1651
1652 //=============================================================================
1653 // Convenience common pre-built types.
1654 const TypeLong *TypeLong::MINUS_1;// -1
1655 const TypeLong *TypeLong::ZERO; // 0
1656 const TypeLong *TypeLong::ONE; // 1
1657 const TypeLong *TypeLong::POS; // >=0
1658 const TypeLong *TypeLong::LONG; // 64-bit integers
1659 const TypeLong *TypeLong::INT; // 32-bit subrange
1660 const TypeLong *TypeLong::UINT; // 32-bit unsigned subrange
1661 const TypeLong *TypeLong::TYPE_DOMAIN; // alias for TypeLong::LONG
1662
1663 //------------------------------TypeLong---------------------------------------
1664 TypeLong::TypeLong( jlong lo, jlong hi, int w ) : Type(Long), _lo(lo), _hi(hi), _widen(w) {
1665 }
1666
1667 //------------------------------make-------------------------------------------
1668 const TypeLong *TypeLong::make( jlong lo ) {
1669 return (TypeLong*)(new TypeLong(lo,lo,WidenMin))->hashcons();
1670 }
1671
1672 static int normalize_long_widen( jlong lo, jlong hi, int w ) {
1673 // Certain normalizations keep us sane when comparing types.
1674 // The 'SMALLINT' covers constants.
1675 if (lo <= hi) {
1676 if (((julong)hi - lo) <= SMALLINT) w = Type::WidenMin;
1677 if (((julong)hi - lo) >= max_julong) w = Type::WidenMax; // TypeLong::LONG
1678 } else {
1679 if (((julong)lo - hi) <= SMALLINT) w = Type::WidenMin;
1680 if (((julong)lo - hi) >= max_julong) w = Type::WidenMin; // dual TypeLong::LONG
1681 }
1682 return w;
1683 }
1684
1685 const TypeLong *TypeLong::make( jlong lo, jlong hi, int w ) {
1686 w = normalize_long_widen(lo, hi, w);
1687 return (TypeLong*)(new TypeLong(lo,hi,w))->hashcons();
1688 }
1689
1690
1691 //------------------------------meet-------------------------------------------
1692 // Compute the MEET of two types. It returns a new Type representation object
1693 // with reference count equal to the number of Types pointing at it.
1694 // Caller should wrap a Types around it.
1695 const Type *TypeLong::xmeet( const Type *t ) const {
1696 // Perform a fast test for common case; meeting the same types together.
1697 if( this == t ) return this; // Meeting same type?
1698
1699 // Currently "this->_base" is a TypeLong
1700 switch (t->base()) { // Switch on original type
1701 case AnyPtr: // Mixing with oops happens when javac
1702 case RawPtr: // reuses local variables
1703 case OopPtr:
1704 case InstPtr:
1705 case AryPtr:
1706 case MetadataPtr:
1707 case KlassPtr:
1708 case NarrowOop:
1709 case NarrowKlass:
1710 case Int:
1711 case FloatTop:
1712 case FloatCon:
1713 case FloatBot:
1714 case DoubleTop:
1715 case DoubleCon:
1716 case DoubleBot:
1717 case Bottom: // Ye Olde Default
1718 return Type::BOTTOM;
1719 default: // All else is a mistake
1720 typerr(t);
1721 case Top: // No change
1722 return this;
1723 case Long: // Long vs Long?
1724 break;
1725 }
1726
1727 // Expand covered set
1728 const TypeLong *r = t->is_long(); // Turn into a TypeLong
1729 return make( MIN2(_lo,r->_lo), MAX2(_hi,r->_hi), MAX2(_widen,r->_widen) );
1730 }
1731
1732 //------------------------------xdual------------------------------------------
1733 // Dual: reverse hi & lo; flip widen
1734 const Type *TypeLong::xdual() const {
1735 int w = normalize_long_widen(_hi,_lo, WidenMax-_widen);
1736 return new TypeLong(_hi,_lo,w);
1737 }
1738
1739 //------------------------------widen------------------------------------------
1740 // Only happens for optimistic top-down optimizations.
1741 const Type *TypeLong::widen( const Type *old, const Type* limit ) const {
1742 // Coming from TOP or such; no widening
1743 if( old->base() != Long ) return this;
1744 const TypeLong *ot = old->is_long();
1745
1746 // If new guy is equal to old guy, no widening
1747 if( _lo == ot->_lo && _hi == ot->_hi )
1748 return old;
1749
1750 // If new guy contains old, then we widened
1751 if( _lo <= ot->_lo && _hi >= ot->_hi ) {
1752 // New contains old
1753 // If new guy is already wider than old, no widening
1754 if( _widen > ot->_widen ) return this;
1755 // If old guy was a constant, do not bother
1756 if (ot->_lo == ot->_hi) return this;
1757 // Now widen new guy.
1758 // Check for widening too far
1759 if (_widen == WidenMax) {
1760 jlong max = max_jlong;
1761 jlong min = min_jlong;
1762 if (limit->isa_long()) {
1763 max = limit->is_long()->_hi;
1764 min = limit->is_long()->_lo;
1765 }
1766 if (min < _lo && _hi < max) {
1767 // If neither endpoint is extremal yet, push out the endpoint
1768 // which is closer to its respective limit.
1769 if (_lo >= 0 || // easy common case
1770 ((julong)_lo - min) >= ((julong)max - _hi)) {
1771 // Try to widen to an unsigned range type of 32/63 bits:
1772 if (max >= max_juint && _hi < max_juint)
1773 return make(_lo, max_juint, WidenMax);
1774 else
1775 return make(_lo, max, WidenMax);
1776 } else {
1777 return make(min, _hi, WidenMax);
1778 }
1779 }
1780 return TypeLong::LONG;
1781 }
1782 // Returned widened new guy
1783 return make(_lo,_hi,_widen+1);
1784 }
1785
1786 // If old guy contains new, then we probably widened too far & dropped to
1787 // bottom. Return the wider fellow.
1788 if ( ot->_lo <= _lo && ot->_hi >= _hi )
1789 return old;
1790
1791 // fatal("Long value range is not subset");
1792 // return this;
1793 return TypeLong::LONG;
1794 }
1795
1796 //------------------------------narrow----------------------------------------
1797 // Only happens for pessimistic optimizations.
1798 const Type *TypeLong::narrow( const Type *old ) const {
1799 if (_lo >= _hi) return this; // already narrow enough
1800 if (old == NULL) return this;
1801 const TypeLong* ot = old->isa_long();
1802 if (ot == NULL) return this;
1803 jlong olo = ot->_lo;
1804 jlong ohi = ot->_hi;
1805
1806 // If new guy is equal to old guy, no narrowing
1807 if (_lo == olo && _hi == ohi) return old;
1808
1809 // If old guy was maximum range, allow the narrowing
1810 if (olo == min_jlong && ohi == max_jlong) return this;
1811
1812 if (_lo < olo || _hi > ohi)
1813 return this; // doesn't narrow; pretty wierd
1814
1815 // The new type narrows the old type, so look for a "death march".
1816 // See comments on PhaseTransform::saturate.
1817 julong nrange = _hi - _lo;
1818 julong orange = ohi - olo;
1819 if (nrange < max_julong - 1 && nrange > (orange >> 1) + (SMALLINT*2)) {
1820 // Use the new type only if the range shrinks a lot.
1821 // We do not want the optimizer computing 2^31 point by point.
1822 return old;
1823 }
1824
1825 return this;
1826 }
1827
1828 //-----------------------------filter------------------------------------------
1829 const Type *TypeLong::filter_helper(const Type *kills, bool include_speculative) const {
1830 const TypeLong* ft = join_helper(kills, include_speculative)->isa_long();
1831 if (ft == NULL || ft->empty())
1832 return Type::TOP; // Canonical empty value
1833 if (ft->_widen < this->_widen) {
1834 // Do not allow the value of kill->_widen to affect the outcome.
1835 // The widen bits must be allowed to run freely through the graph.
1836 ft = TypeLong::make(ft->_lo, ft->_hi, this->_widen);
1837 }
1838 return ft;
1839 }
1840
1841 //------------------------------eq---------------------------------------------
1842 // Structural equality check for Type representations
1843 bool TypeLong::eq( const Type *t ) const {
1844 const TypeLong *r = t->is_long(); // Handy access
1845 return r->_lo == _lo && r->_hi == _hi && r->_widen == _widen;
1846 }
1847
1848 //------------------------------hash-------------------------------------------
1849 // Type-specific hashing function.
1850 int TypeLong::hash(void) const {
1851 return (int)(_lo+_hi+_widen+(int)Type::Long);
1852 }
1853
1854 //------------------------------is_finite--------------------------------------
1855 // Has a finite value
1856 bool TypeLong::is_finite() const {
1857 return true;
1858 }
1859
1860 //------------------------------dump2------------------------------------------
1861 // Dump TypeLong
1862 #ifndef PRODUCT
1863 static const char* longnamenear(jlong x, const char* xname, char* buf, jlong n) {
1864 if (n > x) {
1865 if (n >= x + 10000) return NULL;
1866 sprintf(buf, "%s+" JLONG_FORMAT, xname, n - x);
1867 } else if (n < x) {
1868 if (n <= x - 10000) return NULL;
1869 sprintf(buf, "%s-" JLONG_FORMAT, xname, x - n);
1870 } else {
1871 return xname;
1872 }
1873 return buf;
1874 }
1875
1876 static const char* longname(char* buf, jlong n) {
1877 const char* str;
1878 if (n == min_jlong)
1879 return "min";
1880 else if (n < min_jlong + 10000)
1881 sprintf(buf, "min+" JLONG_FORMAT, n - min_jlong);
1882 else if (n == max_jlong)
1883 return "max";
1884 else if (n > max_jlong - 10000)
1885 sprintf(buf, "max-" JLONG_FORMAT, max_jlong - n);
1886 else if ((str = longnamenear(max_juint, "maxuint", buf, n)) != NULL)
1887 return str;
1888 else if ((str = longnamenear(max_jint, "maxint", buf, n)) != NULL)
1889 return str;
1890 else if ((str = longnamenear(min_jint, "minint", buf, n)) != NULL)
1891 return str;
1892 else
1893 sprintf(buf, JLONG_FORMAT, n);
1894 return buf;
1895 }
1896
1897 void TypeLong::dump2( Dict &d, uint depth, outputStream *st ) const {
1898 char buf[80], buf2[80];
1899 if (_lo == min_jlong && _hi == max_jlong)
1900 st->print("long");
1901 else if (is_con())
1902 st->print("long:%s", longname(buf, get_con()));
1903 else if (_hi == max_jlong)
1904 st->print("long:>=%s", longname(buf, _lo));
1905 else if (_lo == min_jlong)
1906 st->print("long:<=%s", longname(buf, _hi));
1907 else
1908 st->print("long:%s..%s", longname(buf, _lo), longname(buf2, _hi));
1909
1910 if (_widen != 0 && this != TypeLong::LONG)
1911 st->print(":%.*s", _widen, "wwww");
1912 }
1913 #endif
1914
1915 //------------------------------singleton--------------------------------------
1916 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1917 // constants
1918 bool TypeLong::singleton(void) const {
1919 return _lo >= _hi;
1920 }
1921
1922 bool TypeLong::empty(void) const {
1923 return _lo > _hi;
1924 }
1925
1926 //=============================================================================
1927 // Convenience common pre-built types.
1928 const TypeTuple *TypeTuple::IFBOTH; // Return both arms of IF as reachable
1929 const TypeTuple *TypeTuple::IFFALSE;
1930 const TypeTuple *TypeTuple::IFTRUE;
1931 const TypeTuple *TypeTuple::IFNEITHER;
1932 const TypeTuple *TypeTuple::LOOPBODY;
1933 const TypeTuple *TypeTuple::MEMBAR;
1934 const TypeTuple *TypeTuple::STORECONDITIONAL;
1935 const TypeTuple *TypeTuple::START_I2C;
1936 const TypeTuple *TypeTuple::INT_PAIR;
1937 const TypeTuple *TypeTuple::LONG_PAIR;
1938 const TypeTuple *TypeTuple::INT_CC_PAIR;
1939 const TypeTuple *TypeTuple::LONG_CC_PAIR;
1940
1941 static void collect_value_fields(ciValueKlass* vk, const Type** field_array, uint& pos, ExtendedSignature& sig_cc) {
1942 for (int j = 0; j < vk->nof_nonstatic_fields(); j++) {
1943 ciField* field = vk->nonstatic_field_at(j);
1944 BasicType bt = field->type()->basic_type();
1945 const Type* ft = Type::get_const_type(field->type());
1946 field_array[pos++] = ft;
1947 if (type2size[bt] == 2) {
1948 field_array[pos++] = Type::HALF;
1949 }
1950 // Skip reserved arguments
1951 while (SigEntry::next_is_reserved(sig_cc, bt)) {
1952 field_array[pos++] = Type::get_const_basic_type(bt);
1953 if (type2size[bt] == 2) {
1954 field_array[pos++] = Type::HALF;
1955 }
1956 }
1957 }
1958 }
1959
1960 //------------------------------make-------------------------------------------
1961 // Make a TypeTuple from the range of a method signature
1962 const TypeTuple *TypeTuple::make_range(ciSignature* sig, bool ret_vt_fields) {
1963 ciType* return_type = sig->return_type();
1964 bool never_null = sig->returns_never_null();
1965
1966 uint arg_cnt = return_type->size();
1967 ret_vt_fields = ret_vt_fields && never_null && return_type->as_value_klass()->can_be_returned_as_fields();
1968 if (ret_vt_fields) {
1969 arg_cnt = return_type->as_value_klass()->value_arg_slots() + 1;
1970 }
1971
1972 const Type **field_array = fields(arg_cnt);
1973 switch (return_type->basic_type()) {
1974 case T_LONG:
1975 field_array[TypeFunc::Parms] = TypeLong::LONG;
1976 field_array[TypeFunc::Parms+1] = Type::HALF;
1977 break;
1978 case T_DOUBLE:
1979 field_array[TypeFunc::Parms] = Type::DOUBLE;
1980 field_array[TypeFunc::Parms+1] = Type::HALF;
1981 break;
1982 case T_OBJECT:
1983 case T_ARRAY:
1984 case T_BOOLEAN:
1985 case T_CHAR:
1986 case T_FLOAT:
1987 case T_BYTE:
1988 case T_SHORT:
1989 case T_INT:
1990 field_array[TypeFunc::Parms] = get_const_type(return_type);
1991 break;
1992 case T_VALUETYPE:
1993 if (ret_vt_fields) {
1994 uint pos = TypeFunc::Parms;
1995 field_array[pos] = TypePtr::BOTTOM;
1996 pos++;
1997 ExtendedSignature sig = ExtendedSignature(NULL, SigEntryFilter());
1998 collect_value_fields(return_type->as_value_klass(), field_array, pos, sig);
1999 } else {
2000 field_array[TypeFunc::Parms] = get_const_type(return_type)->join_speculative(never_null ? TypePtr::NOTNULL : TypePtr::BOTTOM);
2001 }
2002 break;
2003 case T_VOID:
2004 break;
2005 default:
2006 ShouldNotReachHere();
2007 }
2008 return (TypeTuple*)(new TypeTuple(TypeFunc::Parms + arg_cnt, field_array))->hashcons();
2009 }
2010
2011 // Make a TypeTuple from the domain of a method signature
2012 const TypeTuple *TypeTuple::make_domain(ciMethod* method, bool vt_fields_as_args) {
2013 ciSignature* sig = method->signature();
2014 ExtendedSignature sig_cc = ExtendedSignature(vt_fields_as_args ? method->get_sig_cc() : NULL, SigEntryFilter());
2015
2016 uint arg_cnt = sig->size() + (method->is_static() ? 0 : 1);
2017 if (vt_fields_as_args) {
2018 for (arg_cnt = 0; !sig_cc.at_end(); ++sig_cc) {
2019 arg_cnt += type2size[(*sig_cc)._bt];
2020 }
2021 sig_cc = ExtendedSignature(method->get_sig_cc(), SigEntryFilter());
2022 }
2023
2024 uint pos = TypeFunc::Parms;
2025 const Type** field_array = fields(arg_cnt);
2026 if (!method->is_static()) {
2027 ciInstanceKlass* recv = method->holder();
2028 if (vt_fields_as_args && recv->is_valuetype()) {
2029 collect_value_fields(recv->as_value_klass(), field_array, pos, sig_cc);
2030 } else {
2031 field_array[pos++] = get_const_type(recv)->join_speculative(TypePtr::NOTNULL);
2032 if (vt_fields_as_args) {
2033 ++sig_cc;
2034 }
2035 }
2036 }
2037
2038 int i = 0;
2039 while (pos < TypeFunc::Parms + arg_cnt) {
2040 ciType* type = sig->type_at(i);
2041 BasicType bt = type->basic_type();
2042 bool is_flattened = false;
2043
2044 switch (bt) {
2045 case T_LONG:
2046 field_array[pos++] = TypeLong::LONG;
2047 field_array[pos++] = Type::HALF;
2048 break;
2049 case T_DOUBLE:
2050 field_array[pos++] = Type::DOUBLE;
2051 field_array[pos++] = Type::HALF;
2052 break;
2053 case T_OBJECT:
2054 case T_ARRAY:
2055 case T_FLOAT:
2056 case T_INT:
2057 field_array[pos++] = get_const_type(type);
2058 break;
2059 case T_BOOLEAN:
2060 case T_CHAR:
2061 case T_BYTE:
2062 case T_SHORT:
2063 field_array[pos++] = TypeInt::INT;
2064 break;
2065 case T_VALUETYPE: {
2066 bool never_null = sig->is_never_null_at(i);
2067 if (vt_fields_as_args && never_null) {
2068 is_flattened = true;
2069 collect_value_fields(type->as_value_klass(), field_array, pos, sig_cc);
2070 } else {
2071 field_array[pos++] = get_const_type(type)->join_speculative(never_null ? TypePtr::NOTNULL : TypePtr::BOTTOM);
2072 }
2073 break;
2074 }
2075 default:
2076 ShouldNotReachHere();
2077 }
2078 // Skip reserved arguments
2079 while (!is_flattened && SigEntry::next_is_reserved(sig_cc, bt)) {
2080 field_array[pos++] = Type::get_const_basic_type(bt);
2081 if (type2size[bt] == 2) {
2082 field_array[pos++] = Type::HALF;
2083 }
2084 }
2085 i++;
2086 }
2087 assert(pos == TypeFunc::Parms + arg_cnt, "wrong number of arguments");
2088
2089 return (TypeTuple*)(new TypeTuple(TypeFunc::Parms + arg_cnt, field_array))->hashcons();
2090 }
2091
2092 const TypeTuple *TypeTuple::make( uint cnt, const Type **fields ) {
2093 return (TypeTuple*)(new TypeTuple(cnt,fields))->hashcons();
2094 }
2095
2096 //------------------------------fields-----------------------------------------
2097 // Subroutine call type with space allocated for argument types
2098 // Memory for Control, I_O, Memory, FramePtr, and ReturnAdr is allocated implicitly
2099 const Type **TypeTuple::fields( uint arg_cnt ) {
2100 const Type **flds = (const Type **)(Compile::current()->type_arena()->Amalloc_4((TypeFunc::Parms+arg_cnt)*sizeof(Type*) ));
2101 flds[TypeFunc::Control ] = Type::CONTROL;
2102 flds[TypeFunc::I_O ] = Type::ABIO;
2103 flds[TypeFunc::Memory ] = Type::MEMORY;
2104 flds[TypeFunc::FramePtr ] = TypeRawPtr::BOTTOM;
2105 flds[TypeFunc::ReturnAdr] = Type::RETURN_ADDRESS;
2106
2107 return flds;
2108 }
2109
2110 //------------------------------meet-------------------------------------------
2111 // Compute the MEET of two types. It returns a new Type object.
2112 const Type *TypeTuple::xmeet( const Type *t ) const {
2113 // Perform a fast test for common case; meeting the same types together.
2114 if( this == t ) return this; // Meeting same type-rep?
2115
2116 // Current "this->_base" is Tuple
2117 switch (t->base()) { // switch on original type
2118
2119 case Bottom: // Ye Olde Default
2120 return t;
2121
2122 default: // All else is a mistake
2123 typerr(t);
2124
2125 case Tuple: { // Meeting 2 signatures?
2126 const TypeTuple *x = t->is_tuple();
2127 assert( _cnt == x->_cnt, "" );
2128 const Type **fields = (const Type **)(Compile::current()->type_arena()->Amalloc_4( _cnt*sizeof(Type*) ));
2129 for( uint i=0; i<_cnt; i++ )
2130 fields[i] = field_at(i)->xmeet( x->field_at(i) );
2131 return TypeTuple::make(_cnt,fields);
2132 }
2133 case Top:
2134 break;
2135 }
2136 return this; // Return the double constant
2137 }
2138
2139 //------------------------------xdual------------------------------------------
2140 // Dual: compute field-by-field dual
2141 const Type *TypeTuple::xdual() const {
2142 const Type **fields = (const Type **)(Compile::current()->type_arena()->Amalloc_4( _cnt*sizeof(Type*) ));
2143 for( uint i=0; i<_cnt; i++ )
2144 fields[i] = _fields[i]->dual();
2145 return new TypeTuple(_cnt,fields);
2146 }
2147
2148 //------------------------------eq---------------------------------------------
2149 // Structural equality check for Type representations
2150 bool TypeTuple::eq( const Type *t ) const {
2151 const TypeTuple *s = (const TypeTuple *)t;
2152 if (_cnt != s->_cnt) return false; // Unequal field counts
2153 for (uint i = 0; i < _cnt; i++)
2154 if (field_at(i) != s->field_at(i)) // POINTER COMPARE! NO RECURSION!
2155 return false; // Missed
2156 return true;
2157 }
2158
2159 //------------------------------hash-------------------------------------------
2160 // Type-specific hashing function.
2161 int TypeTuple::hash(void) const {
2162 intptr_t sum = _cnt;
2163 for( uint i=0; i<_cnt; i++ )
2164 sum += (intptr_t)_fields[i]; // Hash on pointers directly
2165 return sum;
2166 }
2167
2168 //------------------------------dump2------------------------------------------
2169 // Dump signature Type
2170 #ifndef PRODUCT
2171 void TypeTuple::dump2( Dict &d, uint depth, outputStream *st ) const {
2172 st->print("{");
2173 if( !depth || d[this] ) { // Check for recursive print
2174 st->print("...}");
2175 return;
2176 }
2177 d.Insert((void*)this, (void*)this); // Stop recursion
2178 if( _cnt ) {
2179 uint i;
2180 for( i=0; i<_cnt-1; i++ ) {
2181 st->print("%d:", i);
2182 _fields[i]->dump2(d, depth-1, st);
2183 st->print(", ");
2184 }
2185 st->print("%d:", i);
2186 _fields[i]->dump2(d, depth-1, st);
2187 }
2188 st->print("}");
2189 }
2190 #endif
2191
2192 //------------------------------singleton--------------------------------------
2193 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
2194 // constants (Ldi nodes). Singletons are integer, float or double constants
2195 // or a single symbol.
2196 bool TypeTuple::singleton(void) const {
2197 return false; // Never a singleton
2198 }
2199
2200 bool TypeTuple::empty(void) const {
2201 for( uint i=0; i<_cnt; i++ ) {
2202 if (_fields[i]->empty()) return true;
2203 }
2204 return false;
2205 }
2206
2207 //=============================================================================
2208 // Convenience common pre-built types.
2209
2210 inline const TypeInt* normalize_array_size(const TypeInt* size) {
2211 // Certain normalizations keep us sane when comparing types.
2212 // We do not want arrayOop variables to differ only by the wideness
2213 // of their index types. Pick minimum wideness, since that is the
2214 // forced wideness of small ranges anyway.
2215 if (size->_widen != Type::WidenMin)
2216 return TypeInt::make(size->_lo, size->_hi, Type::WidenMin);
2217 else
2218 return size;
2219 }
2220
2221 //------------------------------make-------------------------------------------
2222 const TypeAry* TypeAry::make(const Type* elem, const TypeInt* size, bool stable) {
2223 if (UseCompressedOops && elem->isa_oopptr()) {
2224 elem = elem->make_narrowoop();
2225 }
2226 size = normalize_array_size(size);
2227 return (TypeAry*)(new TypeAry(elem,size,stable))->hashcons();
2228 }
2229
2230 //------------------------------meet-------------------------------------------
2231 // Compute the MEET of two types. It returns a new Type object.
2232 const Type *TypeAry::xmeet( const Type *t ) const {
2233 // Perform a fast test for common case; meeting the same types together.
2234 if( this == t ) return this; // Meeting same type-rep?
2235
2236 // Current "this->_base" is Ary
2237 switch (t->base()) { // switch on original type
2238
2239 case Bottom: // Ye Olde Default
2240 return t;
2241
2242 default: // All else is a mistake
2243 typerr(t);
2244
2245 case Array: { // Meeting 2 arrays?
2246 const TypeAry *a = t->is_ary();
2247 return TypeAry::make(_elem->meet_speculative(a->_elem),
2248 _size->xmeet(a->_size)->is_int(),
2249 _stable & a->_stable);
2250 }
2251 case Top:
2252 break;
2253 }
2254 return this; // Return the double constant
2255 }
2256
2257 //------------------------------xdual------------------------------------------
2258 // Dual: compute field-by-field dual
2259 const Type *TypeAry::xdual() const {
2260 const TypeInt* size_dual = _size->dual()->is_int();
2261 size_dual = normalize_array_size(size_dual);
2262 return new TypeAry(_elem->dual(), size_dual, !_stable);
2263 }
2264
2265 //------------------------------eq---------------------------------------------
2266 // Structural equality check for Type representations
2267 bool TypeAry::eq( const Type *t ) const {
2268 const TypeAry *a = (const TypeAry*)t;
2269 return _elem == a->_elem &&
2270 _stable == a->_stable &&
2271 _size == a->_size;
2272 }
2273
2274 //------------------------------hash-------------------------------------------
2275 // Type-specific hashing function.
2276 int TypeAry::hash(void) const {
2277 return (intptr_t)_elem + (intptr_t)_size + (_stable ? 43 : 0);
2278 }
2279
2280 /**
2281 * Return same type without a speculative part in the element
2282 */
2283 const Type* TypeAry::remove_speculative() const {
2284 return make(_elem->remove_speculative(), _size, _stable);
2285 }
2286
2287 /**
2288 * Return same type with cleaned up speculative part of element
2289 */
2290 const Type* TypeAry::cleanup_speculative() const {
2291 return make(_elem->cleanup_speculative(), _size, _stable);
2292 }
2293
2294 /**
2295 * Return same type but with a different inline depth (used for speculation)
2296 *
2297 * @param depth depth to meet with
2298 */
2299 const TypePtr* TypePtr::with_inline_depth(int depth) const {
2300 if (!UseInlineDepthForSpeculativeTypes) {
2301 return this;
2302 }
2303 return make(AnyPtr, _ptr, _offset, _speculative, depth);
2304 }
2305
2306 //----------------------interface_vs_oop---------------------------------------
2307 #ifdef ASSERT
2308 bool TypeAry::interface_vs_oop(const Type *t) const {
2309 const TypeAry* t_ary = t->is_ary();
2310 if (t_ary) {
2311 const TypePtr* this_ptr = _elem->make_ptr(); // In case we have narrow_oops
2312 const TypePtr* t_ptr = t_ary->_elem->make_ptr();
2313 if(this_ptr != NULL && t_ptr != NULL) {
2314 return this_ptr->interface_vs_oop(t_ptr);
2315 }
2316 }
2317 return false;
2318 }
2319 #endif
2320
2321 //------------------------------dump2------------------------------------------
2322 #ifndef PRODUCT
2323 void TypeAry::dump2( Dict &d, uint depth, outputStream *st ) const {
2324 if (_stable) st->print("stable:");
2325 _elem->dump2(d, depth, st);
2326 st->print("[");
2327 _size->dump2(d, depth, st);
2328 st->print("]");
2329 }
2330 #endif
2331
2332 //------------------------------singleton--------------------------------------
2333 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
2334 // constants (Ldi nodes). Singletons are integer, float or double constants
2335 // or a single symbol.
2336 bool TypeAry::singleton(void) const {
2337 return false; // Never a singleton
2338 }
2339
2340 bool TypeAry::empty(void) const {
2341 return _elem->empty() || _size->empty();
2342 }
2343
2344 //--------------------------ary_must_be_exact----------------------------------
2345 bool TypeAry::ary_must_be_exact() const {
2346 if (!UseExactTypes) return false;
2347 // This logic looks at the element type of an array, and returns true
2348 // if the element type is either a primitive or a final instance class.
2349 // In such cases, an array built on this ary must have no subclasses.
2350 if (_elem == BOTTOM) return false; // general array not exact
2351 if (_elem == TOP ) return false; // inverted general array not exact
2352 const TypeOopPtr* toop = NULL;
2353 if (UseCompressedOops && _elem->isa_narrowoop()) {
2354 toop = _elem->make_ptr()->isa_oopptr();
2355 } else {
2356 toop = _elem->isa_oopptr();
2357 }
2358 if (!toop) return true; // a primitive type, like int
2359 ciKlass* tklass = toop->klass();
2360 if (tklass == NULL) return false; // unloaded class
2361 if (!tklass->is_loaded()) return false; // unloaded class
2362 const TypeInstPtr* tinst;
2363 if (_elem->isa_narrowoop())
2364 tinst = _elem->make_ptr()->isa_instptr();
2365 else
2366 tinst = _elem->isa_instptr();
2367 if (tinst) {
2368 if (tklass->as_instance_klass()->is_final()) {
2369 if (tinst->is_valuetypeptr() && (tinst->ptr() == TypePtr::BotPTR || tinst->ptr() == TypePtr::TopPTR)) {
2370 return false;
2371 }
2372 return true;
2373 }
2374 return false;
2375 }
2376 const TypeAryPtr* tap;
2377 if (_elem->isa_narrowoop())
2378 tap = _elem->make_ptr()->isa_aryptr();
2379 else
2380 tap = _elem->isa_aryptr();
2381 if (tap)
2382 return tap->ary()->ary_must_be_exact();
2383 return false;
2384 }
2385
2386 //==============================TypeValueType=======================================
2387
2388 //------------------------------make-------------------------------------------
2389 const TypeValueType* TypeValueType::make(ciValueKlass* vk, bool larval) {
2390 return (TypeValueType*)(new TypeValueType(vk, larval))->hashcons();
2391 }
2392
2393 //------------------------------meet-------------------------------------------
2394 // Compute the MEET of two types. It returns a new Type object.
2395 const Type* TypeValueType::xmeet(const Type* t) const {
2396 // Perform a fast test for common case; meeting the same types together.
2397 if(this == t) return this; // Meeting same type-rep?
2398
2399 // Current "this->_base" is ValueType
2400 switch (t->base()) { // switch on original type
2401
2402 case Int:
2403 case Long:
2404 case FloatTop:
2405 case FloatCon:
2406 case FloatBot:
2407 case DoubleTop:
2408 case DoubleCon:
2409 case DoubleBot:
2410 case NarrowKlass:
2411 case Bottom:
2412 return Type::BOTTOM;
2413
2414 case OopPtr:
2415 case MetadataPtr:
2416 case KlassPtr:
2417 case RawPtr:
2418 return TypePtr::BOTTOM;
2419
2420 case Top:
2421 return this;
2422
2423 case NarrowOop: {
2424 const Type* res = t->make_ptr()->xmeet(this);
2425 if (res->isa_ptr()) {
2426 return res->make_narrowoop();
2427 }
2428 return res;
2429 }
2430
2431 case AryPtr:
2432 case InstPtr: {
2433 return t->xmeet(this);
2434 }
2435
2436 case ValueType: {
2437 // All value types inherit from Object
2438 const TypeValueType* other = t->is_valuetype();
2439 if (_vk == other->_vk) {
2440 if (_larval == other->_larval ||
2441 !_larval) {
2442 return this;
2443 } else {
2444 return t;
2445 }
2446 }
2447 return TypeInstPtr::NOTNULL;
2448 }
2449
2450 default: // All else is a mistake
2451 typerr(t);
2452
2453 }
2454 return this;
2455 }
2456
2457 //------------------------------xdual------------------------------------------
2458 const Type* TypeValueType::xdual() const {
2459 return this;
2460 }
2461
2462 //------------------------------eq---------------------------------------------
2463 // Structural equality check for Type representations
2464 bool TypeValueType::eq(const Type* t) const {
2465 const TypeValueType* vt = t->is_valuetype();
2466 return (_vk == vt->value_klass() && _larval == vt->larval());
2467 }
2468
2469 //------------------------------hash-------------------------------------------
2470 // Type-specific hashing function.
2471 int TypeValueType::hash(void) const {
2472 return (intptr_t)_vk;
2473 }
2474
2475 //------------------------------singleton--------------------------------------
2476 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple constants.
2477 bool TypeValueType::singleton(void) const {
2478 return false;
2479 }
2480
2481 //------------------------------empty------------------------------------------
2482 // TRUE if Type is a type with no values, FALSE otherwise.
2483 bool TypeValueType::empty(void) const {
2484 return false;
2485 }
2486
2487 //------------------------------dump2------------------------------------------
2488 #ifndef PRODUCT
2489 void TypeValueType::dump2(Dict &d, uint depth, outputStream* st) const {
2490 int count = _vk->nof_declared_nonstatic_fields();
2491 st->print("valuetype[%d]:{", count);
2492 st->print("%s", count != 0 ? _vk->declared_nonstatic_field_at(0)->type()->name() : "empty");
2493 for (int i = 1; i < count; ++i) {
2494 st->print(", %s", _vk->declared_nonstatic_field_at(i)->type()->name());
2495 }
2496 st->print("}%s", _larval?" : larval":"");
2497 }
2498 #endif
2499
2500 //==============================TypeVect=======================================
2501 // Convenience common pre-built types.
2502 const TypeVect *TypeVect::VECTS = NULL; // 32-bit vectors
2503 const TypeVect *TypeVect::VECTD = NULL; // 64-bit vectors
2504 const TypeVect *TypeVect::VECTX = NULL; // 128-bit vectors
2505 const TypeVect *TypeVect::VECTY = NULL; // 256-bit vectors
2506 const TypeVect *TypeVect::VECTZ = NULL; // 512-bit vectors
2507
2508 //------------------------------make-------------------------------------------
2509 const TypeVect* TypeVect::make(const Type *elem, uint length) {
2510 BasicType elem_bt = elem->array_element_basic_type();
2511 assert(is_java_primitive(elem_bt), "only primitive types in vector");
2512 assert(length > 1 && is_power_of_2(length), "vector length is power of 2");
2513 assert(Matcher::vector_size_supported(elem_bt, length), "length in range");
2514 int size = length * type2aelembytes(elem_bt);
2515 switch (Matcher::vector_ideal_reg(size)) {
2516 case Op_VecS:
2517 return (TypeVect*)(new TypeVectS(elem, length))->hashcons();
2518 case Op_RegL:
2519 case Op_VecD:
2520 case Op_RegD:
2521 return (TypeVect*)(new TypeVectD(elem, length))->hashcons();
2522 case Op_VecX:
2523 return (TypeVect*)(new TypeVectX(elem, length))->hashcons();
2524 case Op_VecY:
2525 return (TypeVect*)(new TypeVectY(elem, length))->hashcons();
2526 case Op_VecZ:
2527 return (TypeVect*)(new TypeVectZ(elem, length))->hashcons();
2528 }
2529 ShouldNotReachHere();
2530 return NULL;
2531 }
2532
2533 //------------------------------meet-------------------------------------------
2534 // Compute the MEET of two types. It returns a new Type object.
2535 const Type *TypeVect::xmeet( const Type *t ) const {
2536 // Perform a fast test for common case; meeting the same types together.
2537 if( this == t ) return this; // Meeting same type-rep?
2538
2539 // Current "this->_base" is Vector
2540 switch (t->base()) { // switch on original type
2541
2542 case Bottom: // Ye Olde Default
2543 return t;
2544
2545 default: // All else is a mistake
2546 typerr(t);
2547
2548 case VectorS:
2549 case VectorD:
2550 case VectorX:
2551 case VectorY:
2552 case VectorZ: { // Meeting 2 vectors?
2553 const TypeVect* v = t->is_vect();
2554 assert( base() == v->base(), "");
2555 assert(length() == v->length(), "");
2556 assert(element_basic_type() == v->element_basic_type(), "");
2557 return TypeVect::make(_elem->xmeet(v->_elem), _length);
2558 }
2559 case Top:
2560 break;
2561 }
2562 return this;
2563 }
2564
2565 //------------------------------xdual------------------------------------------
2566 // Dual: compute field-by-field dual
2567 const Type *TypeVect::xdual() const {
2568 return new TypeVect(base(), _elem->dual(), _length);
2569 }
2570
2571 //------------------------------eq---------------------------------------------
2572 // Structural equality check for Type representations
2573 bool TypeVect::eq(const Type *t) const {
2574 const TypeVect *v = t->is_vect();
2575 return (_elem == v->_elem) && (_length == v->_length);
2576 }
2577
2578 //------------------------------hash-------------------------------------------
2579 // Type-specific hashing function.
2580 int TypeVect::hash(void) const {
2581 return (intptr_t)_elem + (intptr_t)_length;
2582 }
2583
2584 //------------------------------singleton--------------------------------------
2585 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
2586 // constants (Ldi nodes). Vector is singleton if all elements are the same
2587 // constant value (when vector is created with Replicate code).
2588 bool TypeVect::singleton(void) const {
2589 // There is no Con node for vectors yet.
2590 // return _elem->singleton();
2591 return false;
2592 }
2593
2594 bool TypeVect::empty(void) const {
2595 return _elem->empty();
2596 }
2597
2598 //------------------------------dump2------------------------------------------
2599 #ifndef PRODUCT
2600 void TypeVect::dump2(Dict &d, uint depth, outputStream *st) const {
2601 switch (base()) {
2602 case VectorS:
2603 st->print("vectors["); break;
2604 case VectorD:
2605 st->print("vectord["); break;
2606 case VectorX:
2607 st->print("vectorx["); break;
2608 case VectorY:
2609 st->print("vectory["); break;
2610 case VectorZ:
2611 st->print("vectorz["); break;
2612 default:
2613 ShouldNotReachHere();
2614 }
2615 st->print("%d]:{", _length);
2616 _elem->dump2(d, depth, st);
2617 st->print("}");
2618 }
2619 #endif
2620
2621
2622 //=============================================================================
2623 // Convenience common pre-built types.
2624 const TypePtr *TypePtr::NULL_PTR;
2625 const TypePtr *TypePtr::NOTNULL;
2626 const TypePtr *TypePtr::BOTTOM;
2627
2628 //------------------------------meet-------------------------------------------
2629 // Meet over the PTR enum
2630 const TypePtr::PTR TypePtr::ptr_meet[TypePtr::lastPTR][TypePtr::lastPTR] = {
2631 // TopPTR, AnyNull, Constant, Null, NotNull, BotPTR,
2632 { /* Top */ TopPTR, AnyNull, Constant, Null, NotNull, BotPTR,},
2633 { /* AnyNull */ AnyNull, AnyNull, Constant, BotPTR, NotNull, BotPTR,},
2634 { /* Constant*/ Constant, Constant, Constant, BotPTR, NotNull, BotPTR,},
2635 { /* Null */ Null, BotPTR, BotPTR, Null, BotPTR, BotPTR,},
2636 { /* NotNull */ NotNull, NotNull, NotNull, BotPTR, NotNull, BotPTR,},
2637 { /* BotPTR */ BotPTR, BotPTR, BotPTR, BotPTR, BotPTR, BotPTR,}
2638 };
2639
2640 //------------------------------make-------------------------------------------
2641 const TypePtr* TypePtr::make(TYPES t, enum PTR ptr, Offset offset, const TypePtr* speculative, int inline_depth) {
2642 return (TypePtr*)(new TypePtr(t,ptr,offset, speculative, inline_depth))->hashcons();
2643 }
2644
2645 //------------------------------cast_to_ptr_type-------------------------------
2646 const Type *TypePtr::cast_to_ptr_type(PTR ptr) const {
2647 assert(_base == AnyPtr, "subclass must override cast_to_ptr_type");
2648 if( ptr == _ptr ) return this;
2649 return make(_base, ptr, _offset, _speculative, _inline_depth);
2650 }
2651
2652 //------------------------------get_con----------------------------------------
2653 intptr_t TypePtr::get_con() const {
2654 assert( _ptr == Null, "" );
2655 return offset();
2656 }
2657
2658 //------------------------------meet-------------------------------------------
2659 // Compute the MEET of two types. It returns a new Type object.
2660 const Type *TypePtr::xmeet(const Type *t) const {
2661 const Type* res = xmeet_helper(t);
2662 if (res->isa_ptr() == NULL) {
2663 return res;
2664 }
2665
2666 const TypePtr* res_ptr = res->is_ptr();
2667 if (res_ptr->speculative() != NULL) {
2668 // type->speculative() == NULL means that speculation is no better
2669 // than type, i.e. type->speculative() == type. So there are 2
2670 // ways to represent the fact that we have no useful speculative
2671 // data and we should use a single one to be able to test for
2672 // equality between types. Check whether type->speculative() ==
2673 // type and set speculative to NULL if it is the case.
2674 if (res_ptr->remove_speculative() == res_ptr->speculative()) {
2675 return res_ptr->remove_speculative();
2676 }
2677 }
2678
2679 return res;
2680 }
2681
2682 const Type *TypePtr::xmeet_helper(const Type *t) const {
2683 // Perform a fast test for common case; meeting the same types together.
2684 if( this == t ) return this; // Meeting same type-rep?
2685
2686 // Current "this->_base" is AnyPtr
2687 switch (t->base()) { // switch on original type
2688 case Int: // Mixing ints & oops happens when javac
2689 case Long: // reuses local variables
2690 case FloatTop:
2691 case FloatCon:
2692 case FloatBot:
2693 case DoubleTop:
2694 case DoubleCon:
2695 case DoubleBot:
2696 case NarrowOop:
2697 case NarrowKlass:
2698 case Bottom: // Ye Olde Default
2699 return Type::BOTTOM;
2700 case Top:
2701 return this;
2702
2703 case AnyPtr: { // Meeting to AnyPtrs
2704 const TypePtr *tp = t->is_ptr();
2705 const TypePtr* speculative = xmeet_speculative(tp);
2706 int depth = meet_inline_depth(tp->inline_depth());
2707 return make(AnyPtr, meet_ptr(tp->ptr()), meet_offset(tp->offset()), speculative, depth);
2708 }
2709 case RawPtr: // For these, flip the call around to cut down
2710 case OopPtr:
2711 case InstPtr: // on the cases I have to handle.
2712 case AryPtr:
2713 case MetadataPtr:
2714 case KlassPtr:
2715 return t->xmeet(this); // Call in reverse direction
2716 default: // All else is a mistake
2717 typerr(t);
2718
2719 }
2720 return this;
2721 }
2722
2723 //------------------------------meet_offset------------------------------------
2724 Type::Offset TypePtr::meet_offset(int offset) const {
2725 return _offset.meet(Offset(offset));
2726 }
2727
2728 //------------------------------dual_offset------------------------------------
2729 Type::Offset TypePtr::dual_offset() const {
2730 return _offset.dual();
2731 }
2732
2733 //------------------------------xdual------------------------------------------
2734 // Dual: compute field-by-field dual
2735 const TypePtr::PTR TypePtr::ptr_dual[TypePtr::lastPTR] = {
2736 BotPTR, NotNull, Constant, Null, AnyNull, TopPTR
2737 };
2738 const Type *TypePtr::xdual() const {
2739 return new TypePtr(AnyPtr, dual_ptr(), dual_offset(), dual_speculative(), dual_inline_depth());
2740 }
2741
2742 //------------------------------xadd_offset------------------------------------
2743 Type::Offset TypePtr::xadd_offset(intptr_t offset) const {
2744 return _offset.add(offset);
2745 }
2746
2747 //------------------------------add_offset-------------------------------------
2748 const TypePtr *TypePtr::add_offset( intptr_t offset ) const {
2749 return make(AnyPtr, _ptr, xadd_offset(offset), _speculative, _inline_depth);
2750 }
2751
2752 //------------------------------eq---------------------------------------------
2753 // Structural equality check for Type representations
2754 bool TypePtr::eq( const Type *t ) const {
2755 const TypePtr *a = (const TypePtr*)t;
2756 return _ptr == a->ptr() && _offset == a->_offset && eq_speculative(a) && _inline_depth == a->_inline_depth;
2757 }
2758
2759 //------------------------------hash-------------------------------------------
2760 // Type-specific hashing function.
2761 int TypePtr::hash(void) const {
2762 return java_add(java_add((jint)_ptr, (jint)offset()), java_add((jint)hash_speculative(), (jint)_inline_depth));
2763 ;
2764 }
2765
2766 /**
2767 * Return same type without a speculative part
2768 */
2769 const Type* TypePtr::remove_speculative() const {
2770 if (_speculative == NULL) {
2771 return this;
2772 }
2773 assert(_inline_depth == InlineDepthTop || _inline_depth == InlineDepthBottom, "non speculative type shouldn't have inline depth");
2774 return make(AnyPtr, _ptr, _offset, NULL, _inline_depth);
2775 }
2776
2777 /**
2778 * Return same type but drop speculative part if we know we won't use
2779 * it
2780 */
2781 const Type* TypePtr::cleanup_speculative() const {
2782 if (speculative() == NULL) {
2783 return this;
2784 }
2785 const Type* no_spec = remove_speculative();
2786 // If this is NULL_PTR then we don't need the speculative type
2787 // (with_inline_depth in case the current type inline depth is
2788 // InlineDepthTop)
2789 if (no_spec == NULL_PTR->with_inline_depth(inline_depth())) {
2790 return no_spec;
2791 }
2792 if (above_centerline(speculative()->ptr())) {
2793 return no_spec;
2794 }
2795 const TypeOopPtr* spec_oopptr = speculative()->isa_oopptr();
2796 // If the speculative may be null and is an inexact klass then it
2797 // doesn't help
2798 if (speculative() != TypePtr::NULL_PTR && speculative()->maybe_null() &&
2799 (spec_oopptr == NULL || !spec_oopptr->klass_is_exact())) {
2800 return no_spec;
2801 }
2802 return this;
2803 }
2804
2805 /**
2806 * dual of the speculative part of the type
2807 */
2808 const TypePtr* TypePtr::dual_speculative() const {
2809 if (_speculative == NULL) {
2810 return NULL;
2811 }
2812 return _speculative->dual()->is_ptr();
2813 }
2814
2815 /**
2816 * meet of the speculative parts of 2 types
2817 *
2818 * @param other type to meet with
2819 */
2820 const TypePtr* TypePtr::xmeet_speculative(const TypePtr* other) const {
2821 bool this_has_spec = (_speculative != NULL);
2822 bool other_has_spec = (other->speculative() != NULL);
2823
2824 if (!this_has_spec && !other_has_spec) {
2825 return NULL;
2826 }
2827
2828 // If we are at a point where control flow meets and one branch has
2829 // a speculative type and the other has not, we meet the speculative
2830 // type of one branch with the actual type of the other. If the
2831 // actual type is exact and the speculative is as well, then the
2832 // result is a speculative type which is exact and we can continue
2833 // speculation further.
2834 const TypePtr* this_spec = _speculative;
2835 const TypePtr* other_spec = other->speculative();
2836
2837 if (!this_has_spec) {
2838 this_spec = this;
2839 }
2840
2841 if (!other_has_spec) {
2842 other_spec = other;
2843 }
2844
2845 return this_spec->meet(other_spec)->is_ptr();
2846 }
2847
2848 /**
2849 * dual of the inline depth for this type (used for speculation)
2850 */
2851 int TypePtr::dual_inline_depth() const {
2852 return -inline_depth();
2853 }
2854
2855 /**
2856 * meet of 2 inline depths (used for speculation)
2857 *
2858 * @param depth depth to meet with
2859 */
2860 int TypePtr::meet_inline_depth(int depth) const {
2861 return MAX2(inline_depth(), depth);
2862 }
2863
2864 /**
2865 * Are the speculative parts of 2 types equal?
2866 *
2867 * @param other type to compare this one to
2868 */
2869 bool TypePtr::eq_speculative(const TypePtr* other) const {
2870 if (_speculative == NULL || other->speculative() == NULL) {
2871 return _speculative == other->speculative();
2872 }
2873
2874 if (_speculative->base() != other->speculative()->base()) {
2875 return false;
2876 }
2877
2878 return _speculative->eq(other->speculative());
2879 }
2880
2881 /**
2882 * Hash of the speculative part of the type
2883 */
2884 int TypePtr::hash_speculative() const {
2885 if (_speculative == NULL) {
2886 return 0;
2887 }
2888
2889 return _speculative->hash();
2890 }
2891
2892 /**
2893 * add offset to the speculative part of the type
2894 *
2895 * @param offset offset to add
2896 */
2897 const TypePtr* TypePtr::add_offset_speculative(intptr_t offset) const {
2898 if (_speculative == NULL) {
2899 return NULL;
2900 }
2901 return _speculative->add_offset(offset)->is_ptr();
2902 }
2903
2904 /**
2905 * return exact klass from the speculative type if there's one
2906 */
2907 ciKlass* TypePtr::speculative_type() const {
2908 if (_speculative != NULL && _speculative->isa_oopptr()) {
2909 const TypeOopPtr* speculative = _speculative->join(this)->is_oopptr();
2910 if (speculative->klass_is_exact()) {
2911 return speculative->klass();
2912 }
2913 }
2914 return NULL;
2915 }
2916
2917 /**
2918 * return true if speculative type may be null
2919 */
2920 bool TypePtr::speculative_maybe_null() const {
2921 if (_speculative != NULL) {
2922 const TypePtr* speculative = _speculative->join(this)->is_ptr();
2923 return speculative->maybe_null();
2924 }
2925 return true;
2926 }
2927
2928 bool TypePtr::speculative_always_null() const {
2929 if (_speculative != NULL) {
2930 const TypePtr* speculative = _speculative->join(this)->is_ptr();
2931 return speculative == TypePtr::NULL_PTR;
2932 }
2933 return false;
2934 }
2935
2936 /**
2937 * Same as TypePtr::speculative_type() but return the klass only if
2938 * the speculative tells us is not null
2939 */
2940 ciKlass* TypePtr::speculative_type_not_null() const {
2941 if (speculative_maybe_null()) {
2942 return NULL;
2943 }
2944 return speculative_type();
2945 }
2946
2947 /**
2948 * Check whether new profiling would improve speculative type
2949 *
2950 * @param exact_kls class from profiling
2951 * @param inline_depth inlining depth of profile point
2952 *
2953 * @return true if type profile is valuable
2954 */
2955 bool TypePtr::would_improve_type(ciKlass* exact_kls, int inline_depth) const {
2956 // no profiling?
2957 if (exact_kls == NULL) {
2958 return false;
2959 }
2960 if (speculative() == TypePtr::NULL_PTR) {
2961 return false;
2962 }
2963 // no speculative type or non exact speculative type?
2964 if (speculative_type() == NULL) {
2965 return true;
2966 }
2967 // If the node already has an exact speculative type keep it,
2968 // unless it was provided by profiling that is at a deeper
2969 // inlining level. Profiling at a higher inlining depth is
2970 // expected to be less accurate.
2971 if (_speculative->inline_depth() == InlineDepthBottom) {
2972 return false;
2973 }
2974 assert(_speculative->inline_depth() != InlineDepthTop, "can't do the comparison");
2975 return inline_depth < _speculative->inline_depth();
2976 }
2977
2978 /**
2979 * Check whether new profiling would improve ptr (= tells us it is non
2980 * null)
2981 *
2982 * @param ptr_kind always null or not null?
2983 *
2984 * @return true if ptr profile is valuable
2985 */
2986 bool TypePtr::would_improve_ptr(ProfilePtrKind ptr_kind) const {
2987 // profiling doesn't tell us anything useful
2988 if (ptr_kind != ProfileAlwaysNull && ptr_kind != ProfileNeverNull) {
2989 return false;
2990 }
2991 // We already know this is not null
2992 if (!this->maybe_null()) {
2993 return false;
2994 }
2995 // We already know the speculative type cannot be null
2996 if (!speculative_maybe_null()) {
2997 return false;
2998 }
2999 // We already know this is always null
3000 if (this == TypePtr::NULL_PTR) {
3001 return false;
3002 }
3003 // We already know the speculative type is always null
3004 if (speculative_always_null()) {
3005 return false;
3006 }
3007 if (ptr_kind == ProfileAlwaysNull && speculative() != NULL && speculative()->isa_oopptr()) {
3008 return false;
3009 }
3010 return true;
3011 }
3012
3013 //------------------------------dump2------------------------------------------
3014 const char *const TypePtr::ptr_msg[TypePtr::lastPTR] = {
3015 "TopPTR","AnyNull","Constant","NULL","NotNull","BotPTR"
3016 };
3017
3018 #ifndef PRODUCT
3019 void TypePtr::dump2( Dict &d, uint depth, outputStream *st ) const {
3020 if( _ptr == Null ) st->print("NULL");
3021 else st->print("%s *", ptr_msg[_ptr]);
3022 _offset.dump2(st);
3023 dump_inline_depth(st);
3024 dump_speculative(st);
3025 }
3026
3027 /**
3028 *dump the speculative part of the type
3029 */
3030 void TypePtr::dump_speculative(outputStream *st) const {
3031 if (_speculative != NULL) {
3032 st->print(" (speculative=");
3033 _speculative->dump_on(st);
3034 st->print(")");
3035 }
3036 }
3037
3038 /**
3039 *dump the inline depth of the type
3040 */
3041 void TypePtr::dump_inline_depth(outputStream *st) const {
3042 if (_inline_depth != InlineDepthBottom) {
3043 if (_inline_depth == InlineDepthTop) {
3044 st->print(" (inline_depth=InlineDepthTop)");
3045 } else {
3046 st->print(" (inline_depth=%d)", _inline_depth);
3047 }
3048 }
3049 }
3050 #endif
3051
3052 //------------------------------singleton--------------------------------------
3053 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
3054 // constants
3055 bool TypePtr::singleton(void) const {
3056 // TopPTR, Null, AnyNull, Constant are all singletons
3057 return (_offset != Offset::bottom) && !below_centerline(_ptr);
3058 }
3059
3060 bool TypePtr::empty(void) const {
3061 return (_offset == Offset::top) || above_centerline(_ptr);
3062 }
3063
3064 //=============================================================================
3065 // Convenience common pre-built types.
3066 const TypeRawPtr *TypeRawPtr::BOTTOM;
3067 const TypeRawPtr *TypeRawPtr::NOTNULL;
3068
3069 //------------------------------make-------------------------------------------
3070 const TypeRawPtr *TypeRawPtr::make( enum PTR ptr ) {
3071 assert( ptr != Constant, "what is the constant?" );
3072 assert( ptr != Null, "Use TypePtr for NULL" );
3073 return (TypeRawPtr*)(new TypeRawPtr(ptr,0))->hashcons();
3074 }
3075
3076 const TypeRawPtr *TypeRawPtr::make( address bits ) {
3077 assert( bits, "Use TypePtr for NULL" );
3078 return (TypeRawPtr*)(new TypeRawPtr(Constant,bits))->hashcons();
3079 }
3080
3081 //------------------------------cast_to_ptr_type-------------------------------
3082 const Type *TypeRawPtr::cast_to_ptr_type(PTR ptr) const {
3083 assert( ptr != Constant, "what is the constant?" );
3084 assert( ptr != Null, "Use TypePtr for NULL" );
3085 assert( _bits==0, "Why cast a constant address?");
3086 if( ptr == _ptr ) return this;
3087 return make(ptr);
3088 }
3089
3090 //------------------------------get_con----------------------------------------
3091 intptr_t TypeRawPtr::get_con() const {
3092 assert( _ptr == Null || _ptr == Constant, "" );
3093 return (intptr_t)_bits;
3094 }
3095
3096 //------------------------------meet-------------------------------------------
3097 // Compute the MEET of two types. It returns a new Type object.
3098 const Type *TypeRawPtr::xmeet( const Type *t ) const {
3099 // Perform a fast test for common case; meeting the same types together.
3100 if( this == t ) return this; // Meeting same type-rep?
3101
3102 // Current "this->_base" is RawPtr
3103 switch( t->base() ) { // switch on original type
3104 case Bottom: // Ye Olde Default
3105 return t;
3106 case Top:
3107 return this;
3108 case AnyPtr: // Meeting to AnyPtrs
3109 break;
3110 case RawPtr: { // might be top, bot, any/not or constant
3111 enum PTR tptr = t->is_ptr()->ptr();
3112 enum PTR ptr = meet_ptr( tptr );
3113 if( ptr == Constant ) { // Cannot be equal constants, so...
3114 if( tptr == Constant && _ptr != Constant) return t;
3115 if( _ptr == Constant && tptr != Constant) return this;
3116 ptr = NotNull; // Fall down in lattice
3117 }
3118 return make( ptr );
3119 }
3120
3121 case OopPtr:
3122 case InstPtr:
3123 case AryPtr:
3124 case MetadataPtr:
3125 case KlassPtr:
3126 return TypePtr::BOTTOM; // Oop meet raw is not well defined
3127 default: // All else is a mistake
3128 typerr(t);
3129 }
3130
3131 // Found an AnyPtr type vs self-RawPtr type
3132 const TypePtr *tp = t->is_ptr();
3133 switch (tp->ptr()) {
3134 case TypePtr::TopPTR: return this;
3135 case TypePtr::BotPTR: return t;
3136 case TypePtr::Null:
3137 if( _ptr == TypePtr::TopPTR ) return t;
3138 return TypeRawPtr::BOTTOM;
3139 case TypePtr::NotNull: return TypePtr::make(AnyPtr, meet_ptr(TypePtr::NotNull), tp->meet_offset(0), tp->speculative(), tp->inline_depth());
3140 case TypePtr::AnyNull:
3141 if( _ptr == TypePtr::Constant) return this;
3142 return make( meet_ptr(TypePtr::AnyNull) );
3143 default: ShouldNotReachHere();
3144 }
3145 return this;
3146 }
3147
3148 //------------------------------xdual------------------------------------------
3149 // Dual: compute field-by-field dual
3150 const Type *TypeRawPtr::xdual() const {
3151 return new TypeRawPtr( dual_ptr(), _bits );
3152 }
3153
3154 //------------------------------add_offset-------------------------------------
3155 const TypePtr *TypeRawPtr::add_offset( intptr_t offset ) const {
3156 if( offset == OffsetTop ) return BOTTOM; // Undefined offset-> undefined pointer
3157 if( offset == OffsetBot ) return BOTTOM; // Unknown offset-> unknown pointer
3158 if( offset == 0 ) return this; // No change
3159 switch (_ptr) {
3160 case TypePtr::TopPTR:
3161 case TypePtr::BotPTR:
3162 case TypePtr::NotNull:
3163 return this;
3164 case TypePtr::Null:
3165 case TypePtr::Constant: {
3166 address bits = _bits+offset;
3167 if ( bits == 0 ) return TypePtr::NULL_PTR;
3168 return make( bits );
3169 }
3170 default: ShouldNotReachHere();
3171 }
3172 return NULL; // Lint noise
3173 }
3174
3175 //------------------------------eq---------------------------------------------
3176 // Structural equality check for Type representations
3177 bool TypeRawPtr::eq( const Type *t ) const {
3178 const TypeRawPtr *a = (const TypeRawPtr*)t;
3179 return _bits == a->_bits && TypePtr::eq(t);
3180 }
3181
3182 //------------------------------hash-------------------------------------------
3183 // Type-specific hashing function.
3184 int TypeRawPtr::hash(void) const {
3185 return (intptr_t)_bits + TypePtr::hash();
3186 }
3187
3188 //------------------------------dump2------------------------------------------
3189 #ifndef PRODUCT
3190 void TypeRawPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
3191 if( _ptr == Constant )
3192 st->print(INTPTR_FORMAT, p2i(_bits));
3193 else
3194 st->print("rawptr:%s", ptr_msg[_ptr]);
3195 }
3196 #endif
3197
3198 //=============================================================================
3199 // Convenience common pre-built type.
3200 const TypeOopPtr *TypeOopPtr::BOTTOM;
3201
3202 //------------------------------TypeOopPtr-------------------------------------
3203 TypeOopPtr::TypeOopPtr(TYPES t, PTR ptr, ciKlass* k, bool xk, ciObject* o, Offset offset, Offset field_offset,
3204 int instance_id, const TypePtr* speculative, int inline_depth)
3205 : TypePtr(t, ptr, offset, speculative, inline_depth),
3206 _const_oop(o), _klass(k),
3207 _klass_is_exact(xk),
3208 _is_ptr_to_narrowoop(false),
3209 _is_ptr_to_narrowklass(false),
3210 _is_ptr_to_boxed_value(false),
3211 _instance_id(instance_id) {
3212 if (Compile::current()->eliminate_boxing() && (t == InstPtr) &&
3213 (offset.get() > 0) && xk && (k != 0) && k->is_instance_klass()) {
3214 _is_ptr_to_boxed_value = k->as_instance_klass()->is_boxed_value_offset(offset.get());
3215 }
3216 #ifdef _LP64
3217 if (this->offset() > 0 || this->offset() == Type::OffsetTop || this->offset() == Type::OffsetBot) {
3218 if (this->offset() == oopDesc::klass_offset_in_bytes()) {
3219 _is_ptr_to_narrowklass = UseCompressedClassPointers;
3220 } else if (klass() == NULL) {
3221 // Array with unknown body type
3222 assert(this->isa_aryptr(), "only arrays without klass");
3223 _is_ptr_to_narrowoop = UseCompressedOops;
3224 } else if (UseCompressedOops && this->isa_aryptr() && this->offset() != arrayOopDesc::length_offset_in_bytes()) {
3225 if (klass()->is_obj_array_klass()) {
3226 _is_ptr_to_narrowoop = true;
3227 } else if (klass()->is_value_array_klass() && field_offset != Offset::top && field_offset != Offset::bottom) {
3228 // Check if the field of the value type array element contains oops
3229 ciValueKlass* vk = klass()->as_value_array_klass()->element_klass()->as_value_klass();
3230 int foffset = field_offset.get() + vk->first_field_offset();
3231 ciField* field = vk->get_field_by_offset(foffset, false);
3232 assert(field != NULL, "missing field");
3233 BasicType bt = field->layout_type();
3234 _is_ptr_to_narrowoop = (bt == T_OBJECT || bt == T_ARRAY || T_VALUETYPE);
3235 }
3236 } else if (klass()->is_instance_klass()) {
3237 if (this->isa_klassptr()) {
3238 // Perm objects don't use compressed references
3239 } else if (_offset == Offset::bottom || _offset == Offset::top) {
3240 // unsafe access
3241 _is_ptr_to_narrowoop = UseCompressedOops;
3242 } else { // exclude unsafe ops
3243 assert(this->isa_instptr(), "must be an instance ptr.");
3244 if (klass() == ciEnv::current()->Class_klass() &&
3245 (this->offset() == java_lang_Class::klass_offset_in_bytes() ||
3246 this->offset() == java_lang_Class::array_klass_offset_in_bytes())) {
3247 // Special hidden fields from the Class.
3248 assert(this->isa_instptr(), "must be an instance ptr.");
3249 _is_ptr_to_narrowoop = false;
3250 } else if (klass() == ciEnv::current()->Class_klass() &&
3251 this->offset() >= InstanceMirrorKlass::offset_of_static_fields()) {
3252 // Static fields
3253 assert(o != NULL, "must be constant");
3254 ciInstanceKlass* ik = o->as_instance()->java_lang_Class_klass()->as_instance_klass();
3255 BasicType basic_elem_type;
3256 if (ik->is_valuetype() && this->offset() == ik->as_value_klass()->default_value_offset()) {
3257 // Special hidden field that contains the oop of the default value type
3258 basic_elem_type = T_VALUETYPE;
3259 } else {
3260 ciField* field = ik->get_field_by_offset(this->offset(), true);
3261 assert(field != NULL, "missing field");
3262 basic_elem_type = field->layout_type();
3263 }
3264 _is_ptr_to_narrowoop = UseCompressedOops && (basic_elem_type == T_OBJECT ||
3265 basic_elem_type == T_VALUETYPE ||
3266 basic_elem_type == T_ARRAY);
3267 } else {
3268 // Instance fields which contains a compressed oop references.
3269 ciInstanceKlass* ik = klass()->as_instance_klass();
3270 ciField* field = ik->get_field_by_offset(this->offset(), false);
3271 if (field != NULL) {
3272 BasicType basic_elem_type = field->layout_type();
3273 _is_ptr_to_narrowoop = UseCompressedOops && (basic_elem_type == T_OBJECT ||
3274 basic_elem_type == T_VALUETYPE ||
3275 basic_elem_type == T_ARRAY);
3276 } else if (klass()->equals(ciEnv::current()->Object_klass())) {
3277 // Compile::find_alias_type() cast exactness on all types to verify
3278 // that it does not affect alias type.
3279 _is_ptr_to_narrowoop = UseCompressedOops;
3280 } else {
3281 // Type for the copy start in LibraryCallKit::inline_native_clone().
3282 _is_ptr_to_narrowoop = UseCompressedOops;
3283 }
3284 }
3285 }
3286 }
3287 }
3288 #endif
3289 }
3290
3291 //------------------------------make-------------------------------------------
3292 const TypeOopPtr *TypeOopPtr::make(PTR ptr, Offset offset, int instance_id,
3293 const TypePtr* speculative, int inline_depth) {
3294 assert(ptr != Constant, "no constant generic pointers");
3295 ciKlass* k = Compile::current()->env()->Object_klass();
3296 bool xk = false;
3297 ciObject* o = NULL;
3298 return (TypeOopPtr*)(new TypeOopPtr(OopPtr, ptr, k, xk, o, offset, Offset::bottom, instance_id, speculative, inline_depth))->hashcons();
3299 }
3300
3301
3302 //------------------------------cast_to_ptr_type-------------------------------
3303 const Type *TypeOopPtr::cast_to_ptr_type(PTR ptr) const {
3304 assert(_base == OopPtr, "subclass must override cast_to_ptr_type");
3305 if( ptr == _ptr ) return this;
3306 return make(ptr, _offset, _instance_id, _speculative, _inline_depth);
3307 }
3308
3309 //-----------------------------cast_to_instance_id----------------------------
3310 const TypeOopPtr *TypeOopPtr::cast_to_instance_id(int instance_id) const {
3311 // There are no instances of a general oop.
3312 // Return self unchanged.
3313 return this;
3314 }
3315
3316 const TypeOopPtr *TypeOopPtr::cast_to_nonconst() const {
3317 return this;
3318 }
3319
3320 //-----------------------------cast_to_exactness-------------------------------
3321 const Type *TypeOopPtr::cast_to_exactness(bool klass_is_exact) const {
3322 // There is no such thing as an exact general oop.
3323 // Return self unchanged.
3324 return this;
3325 }
3326
3327
3328 //------------------------------as_klass_type----------------------------------
3329 // Return the klass type corresponding to this instance or array type.
3330 // It is the type that is loaded from an object of this type.
3331 const TypeKlassPtr* TypeOopPtr::as_klass_type() const {
3332 ciKlass* k = klass();
3333 bool xk = klass_is_exact();
3334 if (k == NULL)
3335 return TypeKlassPtr::OBJECT;
3336 else
3337 return TypeKlassPtr::make(xk? Constant: NotNull, k, Offset(0));
3338 }
3339
3340 //------------------------------meet-------------------------------------------
3341 // Compute the MEET of two types. It returns a new Type object.
3342 const Type *TypeOopPtr::xmeet_helper(const Type *t) const {
3343 // Perform a fast test for common case; meeting the same types together.
3344 if( this == t ) return this; // Meeting same type-rep?
3345
3346 // Current "this->_base" is OopPtr
3347 switch (t->base()) { // switch on original type
3348
3349 case Int: // Mixing ints & oops happens when javac
3350 case Long: // reuses local variables
3351 case FloatTop:
3352 case FloatCon:
3353 case FloatBot:
3354 case DoubleTop:
3355 case DoubleCon:
3356 case DoubleBot:
3357 case NarrowOop:
3358 case NarrowKlass:
3359 case Bottom: // Ye Olde Default
3360 return Type::BOTTOM;
3361 case Top:
3362 return this;
3363
3364 default: // All else is a mistake
3365 typerr(t);
3366
3367 case RawPtr:
3368 case MetadataPtr:
3369 case KlassPtr:
3370 return TypePtr::BOTTOM; // Oop meet raw is not well defined
3371
3372 case AnyPtr: {
3373 // Found an AnyPtr type vs self-OopPtr type
3374 const TypePtr *tp = t->is_ptr();
3375 Offset offset = meet_offset(tp->offset());
3376 PTR ptr = meet_ptr(tp->ptr());
3377 const TypePtr* speculative = xmeet_speculative(tp);
3378 int depth = meet_inline_depth(tp->inline_depth());
3379 switch (tp->ptr()) {
3380 case Null:
3381 if (ptr == Null) return TypePtr::make(AnyPtr, ptr, offset, speculative, depth);
3382 // else fall through:
3383 case TopPTR:
3384 case AnyNull: {
3385 int instance_id = meet_instance_id(InstanceTop);
3386 return make(ptr, offset, instance_id, speculative, depth);
3387 }
3388 case BotPTR:
3389 case NotNull:
3390 return TypePtr::make(AnyPtr, ptr, offset, speculative, depth);
3391 default: typerr(t);
3392 }
3393 }
3394
3395 case OopPtr: { // Meeting to other OopPtrs
3396 const TypeOopPtr *tp = t->is_oopptr();
3397 int instance_id = meet_instance_id(tp->instance_id());
3398 const TypePtr* speculative = xmeet_speculative(tp);
3399 int depth = meet_inline_depth(tp->inline_depth());
3400 return make(meet_ptr(tp->ptr()), meet_offset(tp->offset()), instance_id, speculative, depth);
3401 }
3402
3403 case InstPtr: // For these, flip the call around to cut down
3404 case AryPtr:
3405 return t->xmeet(this); // Call in reverse direction
3406
3407 } // End of switch
3408 return this; // Return the double constant
3409 }
3410
3411
3412 //------------------------------xdual------------------------------------------
3413 // Dual of a pure heap pointer. No relevant klass or oop information.
3414 const Type *TypeOopPtr::xdual() const {
3415 assert(klass() == Compile::current()->env()->Object_klass(), "no klasses here");
3416 assert(const_oop() == NULL, "no constants here");
3417 return new TypeOopPtr(_base, dual_ptr(), klass(), klass_is_exact(), const_oop(), dual_offset(), Offset::bottom, dual_instance_id(), dual_speculative(), dual_inline_depth());
3418 }
3419
3420 //--------------------------make_from_klass_common-----------------------------
3421 // Computes the element-type given a klass.
3422 const TypeOopPtr* TypeOopPtr::make_from_klass_common(ciKlass *klass, bool klass_change, bool try_for_exact) {
3423 if (klass->is_instance_klass() || klass->is_valuetype()) {
3424 Compile* C = Compile::current();
3425 Dependencies* deps = C->dependencies();
3426 assert((deps != NULL) == (C->method() != NULL && C->method()->code_size() > 0), "sanity");
3427 // Element is an instance
3428 bool klass_is_exact = false;
3429 if (klass->is_loaded()) {
3430 // Try to set klass_is_exact.
3431 ciInstanceKlass* ik = klass->as_instance_klass();
3432 klass_is_exact = ik->is_final();
3433 if (!klass_is_exact && klass_change
3434 && deps != NULL && UseUniqueSubclasses) {
3435 ciInstanceKlass* sub = ik->unique_concrete_subklass();
3436 if (sub != NULL) {
3437 deps->assert_abstract_with_unique_concrete_subtype(ik, sub);
3438 klass = ik = sub;
3439 klass_is_exact = sub->is_final();
3440 }
3441 }
3442 if (!klass_is_exact && try_for_exact
3443 && deps != NULL && UseExactTypes) {
3444 if (!ik->is_interface() && !ik->has_subklass()) {
3445 // Add a dependence; if concrete subclass added we need to recompile
3446 deps->assert_leaf_type(ik);
3447 klass_is_exact = true;
3448 }
3449 }
3450 }
3451 return TypeInstPtr::make(TypePtr::BotPTR, klass, klass_is_exact, NULL, Offset(0));
3452 } else if (klass->is_obj_array_klass()) {
3453 // Element is an object or value array. Recursively call ourself.
3454 const TypeOopPtr* etype = TypeOopPtr::make_from_klass_common(klass->as_array_klass()->element_klass(), false, try_for_exact);
3455 bool null_free = klass->is_loaded() && klass->as_array_klass()->storage_properties().is_null_free();
3456 if (null_free && etype->is_valuetypeptr()) {
3457 etype = etype->join_speculative(TypePtr::NOTNULL)->is_oopptr();
3458 }
3459 bool xk = etype->klass_is_exact() && (!etype->is_valuetypeptr() || null_free);
3460 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::POS);
3461 // We used to pass NotNull in here, asserting that the sub-arrays
3462 // are all not-null. This is not true in generally, as code can
3463 // slam NULLs down in the subarrays.
3464 const TypeAryPtr* arr = TypeAryPtr::make(TypePtr::BotPTR, arr0, klass, xk, Offset(0));
3465 return arr;
3466 } else if (klass->is_type_array_klass()) {
3467 // Element is an typeArray
3468 const Type* etype = get_const_basic_type(klass->as_type_array_klass()->element_type());
3469 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::POS);
3470 // We used to pass NotNull in here, asserting that the array pointer
3471 // is not-null. That was not true in general.
3472 const TypeAryPtr* arr = TypeAryPtr::make(TypePtr::BotPTR, arr0, klass, true, Offset(0));
3473 return arr;
3474 } else if (klass->is_value_array_klass()) {
3475 ciValueKlass* vk = klass->as_array_klass()->element_klass()->as_value_klass();
3476 const TypeAry* arr0 = TypeAry::make(TypeValueType::make(vk), TypeInt::POS);
3477 const TypeAryPtr* arr = TypeAryPtr::make(TypePtr::BotPTR, arr0, klass, true, Offset(0));
3478 return arr;
3479 } else {
3480 ShouldNotReachHere();
3481 return NULL;
3482 }
3483 }
3484
3485 //------------------------------make_from_constant-----------------------------
3486 // Make a java pointer from an oop constant
3487 const TypeOopPtr* TypeOopPtr::make_from_constant(ciObject* o, bool require_constant) {
3488 assert(!o->is_null_object(), "null object not yet handled here.");
3489
3490 const bool make_constant = require_constant || o->should_be_constant();
3491
3492 ciKlass* klass = o->klass();
3493 if (klass->is_instance_klass() || klass->is_valuetype()) {
3494 // Element is an instance or value type
3495 if (make_constant) {
3496 return TypeInstPtr::make(o);
3497 } else {
3498 return TypeInstPtr::make(TypePtr::NotNull, klass, true, NULL, Offset(0));
3499 }
3500 } else if (klass->is_obj_array_klass()) {
3501 // Element is an object array. Recursively call ourself.
3502 const TypeOopPtr* etype = TypeOopPtr::make_from_klass_raw(klass->as_array_klass()->element_klass());
3503 bool null_free = klass->is_loaded() && klass->as_array_klass()->storage_properties().is_null_free();
3504 if (null_free && etype->is_valuetypeptr()) {
3505 etype = etype->join_speculative(TypePtr::NOTNULL)->is_oopptr();
3506 }
3507 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::make(o->as_array()->length()));
3508 // We used to pass NotNull in here, asserting that the sub-arrays
3509 // are all not-null. This is not true in generally, as code can
3510 // slam NULLs down in the subarrays.
3511 if (make_constant) {
3512 return TypeAryPtr::make(TypePtr::Constant, o, arr0, klass, true, Offset(0));
3513 } else {
3514 return TypeAryPtr::make(TypePtr::NotNull, arr0, klass, true, Offset(0));
3515 }
3516 } else if (klass->is_type_array_klass()) {
3517 // Element is an typeArray
3518 const Type* etype =
3519 (Type*)get_const_basic_type(klass->as_type_array_klass()->element_type());
3520 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::make(o->as_array()->length()));
3521 // We used to pass NotNull in here, asserting that the array pointer
3522 // is not-null. That was not true in general.
3523 if (make_constant) {
3524 return TypeAryPtr::make(TypePtr::Constant, o, arr0, klass, true, Offset(0));
3525 } else {
3526 return TypeAryPtr::make(TypePtr::NotNull, arr0, klass, true, Offset(0));
3527 }
3528 } else if (klass->is_value_array_klass()) {
3529 ciValueKlass* vk = klass->as_array_klass()->element_klass()->as_value_klass();
3530 const TypeAry* arr0 = TypeAry::make(TypeValueType::make(vk), TypeInt::make(o->as_array()->length()));
3531 // We used to pass NotNull in here, asserting that the sub-arrays
3532 // are all not-null. This is not true in generally, as code can
3533 // slam NULLs down in the subarrays.
3534 if (make_constant) {
3535 return TypeAryPtr::make(TypePtr::Constant, o, arr0, klass, true, Offset(0));
3536 } else {
3537 return TypeAryPtr::make(TypePtr::NotNull, arr0, klass, true, Offset(0));
3538 }
3539 }
3540
3541 fatal("unhandled object type");
3542 return NULL;
3543 }
3544
3545 //------------------------------get_con----------------------------------------
3546 intptr_t TypeOopPtr::get_con() const {
3547 assert( _ptr == Null || _ptr == Constant, "" );
3548 assert(offset() >= 0, "");
3549
3550 if (offset() != 0) {
3551 // After being ported to the compiler interface, the compiler no longer
3552 // directly manipulates the addresses of oops. Rather, it only has a pointer
3553 // to a handle at compile time. This handle is embedded in the generated
3554 // code and dereferenced at the time the nmethod is made. Until that time,
3555 // it is not reasonable to do arithmetic with the addresses of oops (we don't
3556 // have access to the addresses!). This does not seem to currently happen,
3557 // but this assertion here is to help prevent its occurence.
3558 tty->print_cr("Found oop constant with non-zero offset");
3559 ShouldNotReachHere();
3560 }
3561
3562 return (intptr_t)const_oop()->constant_encoding();
3563 }
3564
3565
3566 //-----------------------------filter------------------------------------------
3567 // Do not allow interface-vs.-noninterface joins to collapse to top.
3568 const Type *TypeOopPtr::filter_helper(const Type *kills, bool include_speculative) const {
3569
3570 const Type* ft = join_helper(kills, include_speculative);
3571 const TypeInstPtr* ftip = ft->isa_instptr();
3572 const TypeInstPtr* ktip = kills->isa_instptr();
3573
3574 if (ft->empty()) {
3575 // Check for evil case of 'this' being a class and 'kills' expecting an
3576 // interface. This can happen because the bytecodes do not contain
3577 // enough type info to distinguish a Java-level interface variable
3578 // from a Java-level object variable. If we meet 2 classes which
3579 // both implement interface I, but their meet is at 'j/l/O' which
3580 // doesn't implement I, we have no way to tell if the result should
3581 // be 'I' or 'j/l/O'. Thus we'll pick 'j/l/O'. If this then flows
3582 // into a Phi which "knows" it's an Interface type we'll have to
3583 // uplift the type.
3584 if (!empty()) {
3585 if (ktip != NULL && ktip->is_loaded() && ktip->klass()->is_interface()) {
3586 return kills; // Uplift to interface
3587 }
3588 // Also check for evil cases of 'this' being a class array
3589 // and 'kills' expecting an array of interfaces.
3590 Type::get_arrays_base_elements(ft, kills, NULL, &ktip);
3591 if (ktip != NULL && ktip->is_loaded() && ktip->klass()->is_interface()) {
3592 return kills; // Uplift to array of interface
3593 }
3594 }
3595
3596 return Type::TOP; // Canonical empty value
3597 }
3598
3599 // If we have an interface-typed Phi or cast and we narrow to a class type,
3600 // the join should report back the class. However, if we have a J/L/Object
3601 // class-typed Phi and an interface flows in, it's possible that the meet &
3602 // join report an interface back out. This isn't possible but happens
3603 // because the type system doesn't interact well with interfaces.
3604 if (ftip != NULL && ktip != NULL &&
3605 ftip->is_loaded() && ftip->klass()->is_interface() &&
3606 ktip->is_loaded() && !ktip->klass()->is_interface()) {
3607 assert(!ftip->klass_is_exact(), "interface could not be exact");
3608 return ktip->cast_to_ptr_type(ftip->ptr());
3609 }
3610
3611 return ft;
3612 }
3613
3614 //------------------------------eq---------------------------------------------
3615 // Structural equality check for Type representations
3616 bool TypeOopPtr::eq( const Type *t ) const {
3617 const TypeOopPtr *a = (const TypeOopPtr*)t;
3618 if (_klass_is_exact != a->_klass_is_exact ||
3619 _instance_id != a->_instance_id) return false;
3620 ciObject* one = const_oop();
3621 ciObject* two = a->const_oop();
3622 if (one == NULL || two == NULL) {
3623 return (one == two) && TypePtr::eq(t);
3624 } else {
3625 return one->equals(two) && TypePtr::eq(t);
3626 }
3627 }
3628
3629 //------------------------------hash-------------------------------------------
3630 // Type-specific hashing function.
3631 int TypeOopPtr::hash(void) const {
3632 return
3633 java_add(java_add((jint)(const_oop() ? const_oop()->hash() : 0), (jint)_klass_is_exact),
3634 java_add((jint)_instance_id, (jint)TypePtr::hash()));
3635 }
3636
3637 //------------------------------dump2------------------------------------------
3638 #ifndef PRODUCT
3639 void TypeOopPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
3640 st->print("oopptr:%s", ptr_msg[_ptr]);
3641 if( _klass_is_exact ) st->print(":exact");
3642 if( const_oop() ) st->print(INTPTR_FORMAT, p2i(const_oop()));
3643 _offset.dump2(st);
3644 if (_instance_id == InstanceTop)
3645 st->print(",iid=top");
3646 else if (_instance_id != InstanceBot)
3647 st->print(",iid=%d",_instance_id);
3648
3649 dump_inline_depth(st);
3650 dump_speculative(st);
3651 }
3652 #endif
3653
3654 //------------------------------singleton--------------------------------------
3655 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
3656 // constants
3657 bool TypeOopPtr::singleton(void) const {
3658 // detune optimizer to not generate constant oop + constant offset as a constant!
3659 // TopPTR, Null, AnyNull, Constant are all singletons
3660 return (offset() == 0) && !below_centerline(_ptr);
3661 }
3662
3663 //------------------------------add_offset-------------------------------------
3664 const TypePtr *TypeOopPtr::add_offset(intptr_t offset) const {
3665 return make(_ptr, xadd_offset(offset), _instance_id, add_offset_speculative(offset), _inline_depth);
3666 }
3667
3668 /**
3669 * Return same type without a speculative part
3670 */
3671 const Type* TypeOopPtr::remove_speculative() const {
3672 if (_speculative == NULL) {
3673 return this;
3674 }
3675 assert(_inline_depth == InlineDepthTop || _inline_depth == InlineDepthBottom, "non speculative type shouldn't have inline depth");
3676 return make(_ptr, _offset, _instance_id, NULL, _inline_depth);
3677 }
3678
3679 /**
3680 * Return same type but drop speculative part if we know we won't use
3681 * it
3682 */
3683 const Type* TypeOopPtr::cleanup_speculative() const {
3684 // If the klass is exact and the ptr is not null then there's
3685 // nothing that the speculative type can help us with
3686 if (klass_is_exact() && !maybe_null()) {
3687 return remove_speculative();
3688 }
3689 return TypePtr::cleanup_speculative();
3690 }
3691
3692 /**
3693 * Return same type but with a different inline depth (used for speculation)
3694 *
3695 * @param depth depth to meet with
3696 */
3697 const TypePtr* TypeOopPtr::with_inline_depth(int depth) const {
3698 if (!UseInlineDepthForSpeculativeTypes) {
3699 return this;
3700 }
3701 return make(_ptr, _offset, _instance_id, _speculative, depth);
3702 }
3703
3704 //------------------------------with_instance_id--------------------------------
3705 const TypePtr* TypeOopPtr::with_instance_id(int instance_id) const {
3706 assert(_instance_id != -1, "should be known");
3707 return make(_ptr, _offset, instance_id, _speculative, _inline_depth);
3708 }
3709
3710 //------------------------------meet_instance_id--------------------------------
3711 int TypeOopPtr::meet_instance_id( int instance_id ) const {
3712 // Either is 'TOP' instance? Return the other instance!
3713 if( _instance_id == InstanceTop ) return instance_id;
3714 if( instance_id == InstanceTop ) return _instance_id;
3715 // If either is different, return 'BOTTOM' instance
3716 if( _instance_id != instance_id ) return InstanceBot;
3717 return _instance_id;
3718 }
3719
3720 //------------------------------dual_instance_id--------------------------------
3721 int TypeOopPtr::dual_instance_id( ) const {
3722 if( _instance_id == InstanceTop ) return InstanceBot; // Map TOP into BOTTOM
3723 if( _instance_id == InstanceBot ) return InstanceTop; // Map BOTTOM into TOP
3724 return _instance_id; // Map everything else into self
3725 }
3726
3727 /**
3728 * Check whether new profiling would improve speculative type
3729 *
3730 * @param exact_kls class from profiling
3731 * @param inline_depth inlining depth of profile point
3732 *
3733 * @return true if type profile is valuable
3734 */
3735 bool TypeOopPtr::would_improve_type(ciKlass* exact_kls, int inline_depth) const {
3736 // no way to improve an already exact type
3737 if (klass_is_exact()) {
3738 return false;
3739 }
3740 return TypePtr::would_improve_type(exact_kls, inline_depth);
3741 }
3742
3743 //=============================================================================
3744 // Convenience common pre-built types.
3745 const TypeInstPtr *TypeInstPtr::NOTNULL;
3746 const TypeInstPtr *TypeInstPtr::BOTTOM;
3747 const TypeInstPtr *TypeInstPtr::MIRROR;
3748 const TypeInstPtr *TypeInstPtr::MARK;
3749 const TypeInstPtr *TypeInstPtr::KLASS;
3750
3751 //------------------------------TypeInstPtr-------------------------------------
3752 TypeInstPtr::TypeInstPtr(PTR ptr, ciKlass* k, bool xk, ciObject* o, Offset off,
3753 int instance_id, const TypePtr* speculative, int inline_depth)
3754 : TypeOopPtr(InstPtr, ptr, k, xk, o, off, Offset::bottom, instance_id, speculative, inline_depth),
3755 _name(k->name()) {
3756 assert(k != NULL &&
3757 (k->is_loaded() || o == NULL),
3758 "cannot have constants with non-loaded klass");
3759 };
3760
3761 //------------------------------make-------------------------------------------
3762 const TypeInstPtr *TypeInstPtr::make(PTR ptr,
3763 ciKlass* k,
3764 bool xk,
3765 ciObject* o,
3766 Offset offset,
3767 int instance_id,
3768 const TypePtr* speculative,
3769 int inline_depth) {
3770 assert( !k->is_loaded() || k->is_instance_klass(), "Must be for instance");
3771 // Either const_oop() is NULL or else ptr is Constant
3772 assert( (!o && ptr != Constant) || (o && ptr == Constant),
3773 "constant pointers must have a value supplied" );
3774 // Ptr is never Null
3775 assert( ptr != Null, "NULL pointers are not typed" );
3776
3777 assert(instance_id <= 0 || xk || !UseExactTypes, "instances are always exactly typed");
3778 if (!UseExactTypes) xk = false;
3779 if (ptr == Constant) {
3780 // Note: This case includes meta-object constants, such as methods.
3781 xk = true;
3782 } else if (k->is_loaded()) {
3783 ciInstanceKlass* ik = k->as_instance_klass();
3784 if (!xk && ik->is_final()) xk = true; // no inexact final klass
3785 if (xk && ik->is_interface()) xk = false; // no exact interface
3786 }
3787
3788 // Now hash this baby
3789 TypeInstPtr *result =
3790 (TypeInstPtr*)(new TypeInstPtr(ptr, k, xk, o ,offset, instance_id, speculative, inline_depth))->hashcons();
3791
3792 return result;
3793 }
3794
3795 /**
3796 * Create constant type for a constant boxed value
3797 */
3798 const Type* TypeInstPtr::get_const_boxed_value() const {
3799 assert(is_ptr_to_boxed_value(), "should be called only for boxed value");
3800 assert((const_oop() != NULL), "should be called only for constant object");
3801 ciConstant constant = const_oop()->as_instance()->field_value_by_offset(offset());
3802 BasicType bt = constant.basic_type();
3803 switch (bt) {
3804 case T_BOOLEAN: return TypeInt::make(constant.as_boolean());
3805 case T_INT: return TypeInt::make(constant.as_int());
3806 case T_CHAR: return TypeInt::make(constant.as_char());
3807 case T_BYTE: return TypeInt::make(constant.as_byte());
3808 case T_SHORT: return TypeInt::make(constant.as_short());
3809 case T_FLOAT: return TypeF::make(constant.as_float());
3810 case T_DOUBLE: return TypeD::make(constant.as_double());
3811 case T_LONG: return TypeLong::make(constant.as_long());
3812 default: break;
3813 }
3814 fatal("Invalid boxed value type '%s'", type2name(bt));
3815 return NULL;
3816 }
3817
3818 //------------------------------cast_to_ptr_type-------------------------------
3819 const Type *TypeInstPtr::cast_to_ptr_type(PTR ptr) const {
3820 if( ptr == _ptr ) return this;
3821 // Reconstruct _sig info here since not a problem with later lazy
3822 // construction, _sig will show up on demand.
3823 return make(ptr, klass(), klass_is_exact(), const_oop(), _offset, _instance_id, _speculative, _inline_depth);
3824 }
3825
3826
3827 //-----------------------------cast_to_exactness-------------------------------
3828 const Type *TypeInstPtr::cast_to_exactness(bool klass_is_exact) const {
3829 if( klass_is_exact == _klass_is_exact ) return this;
3830 if (!UseExactTypes) return this;
3831 if (!_klass->is_loaded()) return this;
3832 ciInstanceKlass* ik = _klass->as_instance_klass();
3833 if( (ik->is_final() || _const_oop) ) return this; // cannot clear xk
3834 if( ik->is_interface() ) return this; // cannot set xk
3835 return make(ptr(), klass(), klass_is_exact, const_oop(), _offset, _instance_id, _speculative, _inline_depth);
3836 }
3837
3838 //-----------------------------cast_to_instance_id----------------------------
3839 const TypeOopPtr *TypeInstPtr::cast_to_instance_id(int instance_id) const {
3840 if( instance_id == _instance_id ) return this;
3841 return make(_ptr, klass(), _klass_is_exact, const_oop(), _offset, instance_id, _speculative, _inline_depth);
3842 }
3843
3844 const TypeOopPtr *TypeInstPtr::cast_to_nonconst() const {
3845 if (const_oop() == NULL) return this;
3846 return make(NotNull, klass(), _klass_is_exact, NULL, _offset, _instance_id, _speculative, _inline_depth);
3847 }
3848
3849 //------------------------------xmeet_unloaded---------------------------------
3850 // Compute the MEET of two InstPtrs when at least one is unloaded.
3851 // Assume classes are different since called after check for same name/class-loader
3852 const TypeInstPtr *TypeInstPtr::xmeet_unloaded(const TypeInstPtr *tinst) const {
3853 Offset off = meet_offset(tinst->offset());
3854 PTR ptr = meet_ptr(tinst->ptr());
3855 int instance_id = meet_instance_id(tinst->instance_id());
3856 const TypePtr* speculative = xmeet_speculative(tinst);
3857 int depth = meet_inline_depth(tinst->inline_depth());
3858
3859 const TypeInstPtr *loaded = is_loaded() ? this : tinst;
3860 const TypeInstPtr *unloaded = is_loaded() ? tinst : this;
3861 if( loaded->klass()->equals(ciEnv::current()->Object_klass()) ) {
3862 //
3863 // Meet unloaded class with java/lang/Object
3864 //
3865 // Meet
3866 // | Unloaded Class
3867 // Object | TOP | AnyNull | Constant | NotNull | BOTTOM |
3868 // ===================================================================
3869 // TOP | ..........................Unloaded......................|
3870 // AnyNull | U-AN |................Unloaded......................|
3871 // Constant | ... O-NN .................................. | O-BOT |
3872 // NotNull | ... O-NN .................................. | O-BOT |
3873 // BOTTOM | ........................Object-BOTTOM ..................|
3874 //
3875 assert(loaded->ptr() != TypePtr::Null, "insanity check");
3876 //
3877 if( loaded->ptr() == TypePtr::TopPTR ) { return unloaded; }
3878 else if (loaded->ptr() == TypePtr::AnyNull) { return TypeInstPtr::make(ptr, unloaded->klass(), false, NULL, off, instance_id, speculative, depth); }
3879 else if (loaded->ptr() == TypePtr::BotPTR ) { return TypeInstPtr::BOTTOM; }
3880 else if (loaded->ptr() == TypePtr::Constant || loaded->ptr() == TypePtr::NotNull) {
3881 if (unloaded->ptr() == TypePtr::BotPTR ) { return TypeInstPtr::BOTTOM; }
3882 else { return TypeInstPtr::NOTNULL; }
3883 }
3884 else if( unloaded->ptr() == TypePtr::TopPTR ) { return unloaded; }
3885
3886 return unloaded->cast_to_ptr_type(TypePtr::AnyNull)->is_instptr();
3887 }
3888
3889 // Both are unloaded, not the same class, not Object
3890 // Or meet unloaded with a different loaded class, not java/lang/Object
3891 if( ptr != TypePtr::BotPTR ) {
3892 return TypeInstPtr::NOTNULL;
3893 }
3894 return TypeInstPtr::BOTTOM;
3895 }
3896
3897
3898 //------------------------------meet-------------------------------------------
3899 // Compute the MEET of two types. It returns a new Type object.
3900 const Type *TypeInstPtr::xmeet_helper(const Type *t) const {
3901 // Perform a fast test for common case; meeting the same types together.
3902 if( this == t ) return this; // Meeting same type-rep?
3903
3904 // Current "this->_base" is Pointer
3905 switch (t->base()) { // switch on original type
3906
3907 case Int: // Mixing ints & oops happens when javac
3908 case Long: // reuses local variables
3909 case FloatTop:
3910 case FloatCon:
3911 case FloatBot:
3912 case DoubleTop:
3913 case DoubleCon:
3914 case DoubleBot:
3915 case NarrowOop:
3916 case NarrowKlass:
3917 case Bottom: // Ye Olde Default
3918 return Type::BOTTOM;
3919 case Top:
3920 return this;
3921
3922 default: // All else is a mistake
3923 typerr(t);
3924
3925 case MetadataPtr:
3926 case KlassPtr:
3927 case RawPtr: return TypePtr::BOTTOM;
3928
3929 case AryPtr: { // All arrays inherit from Object class
3930 const TypeAryPtr *tp = t->is_aryptr();
3931 Offset offset = meet_offset(tp->offset());
3932 PTR ptr = meet_ptr(tp->ptr());
3933 int instance_id = meet_instance_id(tp->instance_id());
3934 const TypePtr* speculative = xmeet_speculative(tp);
3935 int depth = meet_inline_depth(tp->inline_depth());
3936 switch (ptr) {
3937 case TopPTR:
3938 case AnyNull: // Fall 'down' to dual of object klass
3939 // For instances when a subclass meets a superclass we fall
3940 // below the centerline when the superclass is exact. We need to
3941 // do the same here.
3942 if (klass()->equals(ciEnv::current()->Object_klass()) && !klass_is_exact()) {
3943 return TypeAryPtr::make(ptr, tp->ary(), tp->klass(), tp->klass_is_exact(), offset, tp->field_offset(), instance_id, speculative, depth);
3944 } else {
3945 // cannot subclass, so the meet has to fall badly below the centerline
3946 ptr = NotNull;
3947 instance_id = InstanceBot;
3948 return TypeInstPtr::make( ptr, ciEnv::current()->Object_klass(), false, NULL, offset, instance_id, speculative, depth);
3949 }
3950 case Constant:
3951 case NotNull:
3952 case BotPTR: // Fall down to object klass
3953 // LCA is object_klass, but if we subclass from the top we can do better
3954 if( above_centerline(_ptr) ) { // if( _ptr == TopPTR || _ptr == AnyNull )
3955 // If 'this' (InstPtr) is above the centerline and it is Object class
3956 // then we can subclass in the Java class hierarchy.
3957 // For instances when a subclass meets a superclass we fall
3958 // below the centerline when the superclass is exact. We need
3959 // to do the same here.
3960 if (klass()->equals(ciEnv::current()->Object_klass()) && !klass_is_exact()) {
3961 // that is, tp's array type is a subtype of my klass
3962 return TypeAryPtr::make(ptr, (ptr == Constant ? tp->const_oop() : NULL),
3963 tp->ary(), tp->klass(), tp->klass_is_exact(), offset, tp->field_offset(), instance_id, speculative, depth);
3964 }
3965 }
3966 // The other case cannot happen, since I cannot be a subtype of an array.
3967 // The meet falls down to Object class below centerline.
3968 if( ptr == Constant )
3969 ptr = NotNull;
3970 instance_id = InstanceBot;
3971 return make(ptr, ciEnv::current()->Object_klass(), false, NULL, offset, instance_id, speculative, depth);
3972 default: typerr(t);
3973 }
3974 }
3975
3976 case OopPtr: { // Meeting to OopPtrs
3977 // Found a OopPtr type vs self-InstPtr type
3978 const TypeOopPtr *tp = t->is_oopptr();
3979 Offset offset = meet_offset(tp->offset());
3980 PTR ptr = meet_ptr(tp->ptr());
3981 switch (tp->ptr()) {
3982 case TopPTR:
3983 case AnyNull: {
3984 int instance_id = meet_instance_id(InstanceTop);
3985 const TypePtr* speculative = xmeet_speculative(tp);
3986 int depth = meet_inline_depth(tp->inline_depth());
3987 return make(ptr, klass(), klass_is_exact(),
3988 (ptr == Constant ? const_oop() : NULL), offset, instance_id, speculative, depth);
3989 }
3990 case NotNull:
3991 case BotPTR: {
3992 int instance_id = meet_instance_id(tp->instance_id());
3993 const TypePtr* speculative = xmeet_speculative(tp);
3994 int depth = meet_inline_depth(tp->inline_depth());
3995 return TypeOopPtr::make(ptr, offset, instance_id, speculative, depth);
3996 }
3997 default: typerr(t);
3998 }
3999 }
4000
4001 case AnyPtr: { // Meeting to AnyPtrs
4002 // Found an AnyPtr type vs self-InstPtr type
4003 const TypePtr *tp = t->is_ptr();
4004 Offset offset = meet_offset(tp->offset());
4005 PTR ptr = meet_ptr(tp->ptr());
4006 int instance_id = meet_instance_id(InstanceTop);
4007 const TypePtr* speculative = xmeet_speculative(tp);
4008 int depth = meet_inline_depth(tp->inline_depth());
4009 switch (tp->ptr()) {
4010 case Null:
4011 if( ptr == Null ) return TypePtr::make(AnyPtr, ptr, offset, speculative, depth);
4012 // else fall through to AnyNull
4013 case TopPTR:
4014 case AnyNull: {
4015 return make(ptr, klass(), klass_is_exact(),
4016 (ptr == Constant ? const_oop() : NULL), offset, instance_id, speculative, depth);
4017 }
4018 case NotNull:
4019 case BotPTR:
4020 return TypePtr::make(AnyPtr, ptr, offset, speculative,depth);
4021 default: typerr(t);
4022 }
4023 }
4024
4025 /*
4026 A-top }
4027 / | \ } Tops
4028 B-top A-any C-top }
4029 | / | \ | } Any-nulls
4030 B-any | C-any }
4031 | | |
4032 B-con A-con C-con } constants; not comparable across classes
4033 | | |
4034 B-not | C-not }
4035 | \ | / | } not-nulls
4036 B-bot A-not C-bot }
4037 \ | / } Bottoms
4038 A-bot }
4039 */
4040
4041 case InstPtr: { // Meeting 2 Oops?
4042 // Found an InstPtr sub-type vs self-InstPtr type
4043 const TypeInstPtr *tinst = t->is_instptr();
4044 Offset off = meet_offset( tinst->offset() );
4045 PTR ptr = meet_ptr( tinst->ptr() );
4046 int instance_id = meet_instance_id(tinst->instance_id());
4047 const TypePtr* speculative = xmeet_speculative(tinst);
4048 int depth = meet_inline_depth(tinst->inline_depth());
4049
4050 // Check for easy case; klasses are equal (and perhaps not loaded!)
4051 // If we have constants, then we created oops so classes are loaded
4052 // and we can handle the constants further down. This case handles
4053 // both-not-loaded or both-loaded classes
4054 if (ptr != Constant && klass()->equals(tinst->klass()) && klass_is_exact() == tinst->klass_is_exact()) {
4055 return make(ptr, klass(), klass_is_exact(), NULL, off, instance_id, speculative, depth);
4056 }
4057
4058 // Classes require inspection in the Java klass hierarchy. Must be loaded.
4059 ciKlass* tinst_klass = tinst->klass();
4060 ciKlass* this_klass = this->klass();
4061 bool tinst_xk = tinst->klass_is_exact();
4062 bool this_xk = this->klass_is_exact();
4063 if (!tinst_klass->is_loaded() || !this_klass->is_loaded() ) {
4064 // One of these classes has not been loaded
4065 const TypeInstPtr *unloaded_meet = xmeet_unloaded(tinst);
4066 #ifndef PRODUCT
4067 if( PrintOpto && Verbose ) {
4068 tty->print("meet of unloaded classes resulted in: "); unloaded_meet->dump(); tty->cr();
4069 tty->print(" this == "); this->dump(); tty->cr();
4070 tty->print(" tinst == "); tinst->dump(); tty->cr();
4071 }
4072 #endif
4073 return unloaded_meet;
4074 }
4075
4076 // Handle mixing oops and interfaces first.
4077 if( this_klass->is_interface() && !(tinst_klass->is_interface() ||
4078 tinst_klass == ciEnv::current()->Object_klass())) {
4079 ciKlass *tmp = tinst_klass; // Swap interface around
4080 tinst_klass = this_klass;
4081 this_klass = tmp;
4082 bool tmp2 = tinst_xk;
4083 tinst_xk = this_xk;
4084 this_xk = tmp2;
4085 }
4086 if (tinst_klass->is_interface() &&
4087 !(this_klass->is_interface() ||
4088 // Treat java/lang/Object as an honorary interface,
4089 // because we need a bottom for the interface hierarchy.
4090 this_klass == ciEnv::current()->Object_klass())) {
4091 // Oop meets interface!
4092
4093 // See if the oop subtypes (implements) interface.
4094 ciKlass *k;
4095 bool xk;
4096 if( this_klass->is_subtype_of( tinst_klass ) ) {
4097 // Oop indeed subtypes. Now keep oop or interface depending
4098 // on whether we are both above the centerline or either is
4099 // below the centerline. If we are on the centerline
4100 // (e.g., Constant vs. AnyNull interface), use the constant.
4101 k = below_centerline(ptr) ? tinst_klass : this_klass;
4102 // If we are keeping this_klass, keep its exactness too.
4103 xk = below_centerline(ptr) ? tinst_xk : this_xk;
4104 } else { // Does not implement, fall to Object
4105 // Oop does not implement interface, so mixing falls to Object
4106 // just like the verifier does (if both are above the
4107 // centerline fall to interface)
4108 k = above_centerline(ptr) ? tinst_klass : ciEnv::current()->Object_klass();
4109 xk = above_centerline(ptr) ? tinst_xk : false;
4110 // Watch out for Constant vs. AnyNull interface.
4111 if (ptr == Constant) ptr = NotNull; // forget it was a constant
4112 instance_id = InstanceBot;
4113 }
4114 ciObject* o = NULL; // the Constant value, if any
4115 if (ptr == Constant) {
4116 // Find out which constant.
4117 o = (this_klass == klass()) ? const_oop() : tinst->const_oop();
4118 }
4119 return make(ptr, k, xk, o, off, instance_id, speculative, depth);
4120 }
4121
4122 // Either oop vs oop or interface vs interface or interface vs Object
4123
4124 // !!! Here's how the symmetry requirement breaks down into invariants:
4125 // If we split one up & one down AND they subtype, take the down man.
4126 // If we split one up & one down AND they do NOT subtype, "fall hard".
4127 // If both are up and they subtype, take the subtype class.
4128 // If both are up and they do NOT subtype, "fall hard".
4129 // If both are down and they subtype, take the supertype class.
4130 // If both are down and they do NOT subtype, "fall hard".
4131 // Constants treated as down.
4132
4133 // Now, reorder the above list; observe that both-down+subtype is also
4134 // "fall hard"; "fall hard" becomes the default case:
4135 // If we split one up & one down AND they subtype, take the down man.
4136 // If both are up and they subtype, take the subtype class.
4137
4138 // If both are down and they subtype, "fall hard".
4139 // If both are down and they do NOT subtype, "fall hard".
4140 // If both are up and they do NOT subtype, "fall hard".
4141 // If we split one up & one down AND they do NOT subtype, "fall hard".
4142
4143 // If a proper subtype is exact, and we return it, we return it exactly.
4144 // If a proper supertype is exact, there can be no subtyping relationship!
4145 // If both types are equal to the subtype, exactness is and-ed below the
4146 // centerline and or-ed above it. (N.B. Constants are always exact.)
4147
4148 // Check for subtyping:
4149 ciKlass *subtype = NULL;
4150 bool subtype_exact = false;
4151 if( tinst_klass->equals(this_klass) ) {
4152 subtype = this_klass;
4153 subtype_exact = below_centerline(ptr) ? (this_xk & tinst_xk) : (this_xk | tinst_xk);
4154 } else if( !tinst_xk && this_klass->is_subtype_of( tinst_klass ) ) {
4155 subtype = this_klass; // Pick subtyping class
4156 subtype_exact = this_xk;
4157 } else if( !this_xk && tinst_klass->is_subtype_of( this_klass ) ) {
4158 subtype = tinst_klass; // Pick subtyping class
4159 subtype_exact = tinst_xk;
4160 }
4161
4162 if( subtype ) {
4163 if( above_centerline(ptr) ) { // both are up?
4164 this_klass = tinst_klass = subtype;
4165 this_xk = tinst_xk = subtype_exact;
4166 } else if( above_centerline(this ->_ptr) && !above_centerline(tinst->_ptr) ) {
4167 this_klass = tinst_klass; // tinst is down; keep down man
4168 this_xk = tinst_xk;
4169 } else if( above_centerline(tinst->_ptr) && !above_centerline(this ->_ptr) ) {
4170 tinst_klass = this_klass; // this is down; keep down man
4171 tinst_xk = this_xk;
4172 } else {
4173 this_xk = subtype_exact; // either they are equal, or we'll do an LCA
4174 }
4175 }
4176
4177 // Check for classes now being equal
4178 if (tinst_klass->equals(this_klass)) {
4179 // If the klasses are equal, the constants may still differ. Fall to
4180 // NotNull if they do (neither constant is NULL; that is a special case
4181 // handled elsewhere).
4182 ciObject* o = NULL; // Assume not constant when done
4183 ciObject* this_oop = const_oop();
4184 ciObject* tinst_oop = tinst->const_oop();
4185 if( ptr == Constant ) {
4186 if (this_oop != NULL && tinst_oop != NULL &&
4187 this_oop->equals(tinst_oop) )
4188 o = this_oop;
4189 else if (above_centerline(this ->_ptr))
4190 o = tinst_oop;
4191 else if (above_centerline(tinst ->_ptr))
4192 o = this_oop;
4193 else
4194 ptr = NotNull;
4195 }
4196 return make(ptr, this_klass, this_xk, o, off, instance_id, speculative, depth);
4197 } // Else classes are not equal
4198
4199 // Since klasses are different, we require a LCA in the Java
4200 // class hierarchy - which means we have to fall to at least NotNull.
4201 if( ptr == TopPTR || ptr == AnyNull || ptr == Constant )
4202 ptr = NotNull;
4203
4204 instance_id = InstanceBot;
4205
4206 // Now we find the LCA of Java classes
4207 ciKlass* k = this_klass->least_common_ancestor(tinst_klass);
4208 return make(ptr, k, false, NULL, off, instance_id, speculative, depth);
4209 } // End of case InstPtr
4210
4211 case ValueType: {
4212 const TypeValueType* tv = t->is_valuetype();
4213 if (above_centerline(ptr())) {
4214 if (tv->value_klass()->is_subtype_of(_klass)) {
4215 return t;
4216 } else {
4217 return TypeInstPtr::make(NotNull, _klass);
4218 }
4219 } else {
4220 PTR ptr = this->_ptr;
4221 if (ptr == Constant) {
4222 ptr = NotNull;
4223 }
4224 if (tv->value_klass()->is_subtype_of(_klass)) {
4225 return TypeInstPtr::make(ptr, _klass);
4226 } else {
4227 return TypeInstPtr::make(ptr, ciEnv::current()->Object_klass());
4228 }
4229 }
4230 }
4231
4232 } // End of switch
4233 return this; // Return the double constant
4234 }
4235
4236
4237 //------------------------java_mirror_type--------------------------------------
4238 ciType* TypeInstPtr::java_mirror_type(bool* is_val_type) const {
4239 // must be a singleton type
4240 if( const_oop() == NULL ) return NULL;
4241
4242 // must be of type java.lang.Class
4243 if( klass() != ciEnv::current()->Class_klass() ) return NULL;
4244
4245 return const_oop()->as_instance()->java_mirror_type(is_val_type);
4246 }
4247
4248
4249 //------------------------------xdual------------------------------------------
4250 // Dual: do NOT dual on klasses. This means I do NOT understand the Java
4251 // inheritance mechanism.
4252 const Type *TypeInstPtr::xdual() const {
4253 return new TypeInstPtr(dual_ptr(), klass(), klass_is_exact(), const_oop(), dual_offset(), dual_instance_id(), dual_speculative(), dual_inline_depth());
4254 }
4255
4256 //------------------------------eq---------------------------------------------
4257 // Structural equality check for Type representations
4258 bool TypeInstPtr::eq( const Type *t ) const {
4259 const TypeInstPtr *p = t->is_instptr();
4260 return
4261 klass()->equals(p->klass()) &&
4262 TypeOopPtr::eq(p); // Check sub-type stuff
4263 }
4264
4265 //------------------------------hash-------------------------------------------
4266 // Type-specific hashing function.
4267 int TypeInstPtr::hash(void) const {
4268 int hash = java_add((jint)klass()->hash(), (jint)TypeOopPtr::hash());
4269 return hash;
4270 }
4271
4272 //------------------------------dump2------------------------------------------
4273 // Dump oop Type
4274 #ifndef PRODUCT
4275 void TypeInstPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
4276 // Print the name of the klass.
4277 klass()->print_name_on(st);
4278
4279 switch( _ptr ) {
4280 case Constant:
4281 // TO DO: Make CI print the hex address of the underlying oop.
4282 if (WizardMode || Verbose) {
4283 const_oop()->print_oop(st);
4284 }
4285 case BotPTR:
4286 if (!WizardMode && !Verbose) {
4287 if( _klass_is_exact ) st->print(":exact");
4288 break;
4289 }
4290 case TopPTR:
4291 case AnyNull:
4292 case NotNull:
4293 st->print(":%s", ptr_msg[_ptr]);
4294 if( _klass_is_exact ) st->print(":exact");
4295 break;
4296 default:
4297 break;
4298 }
4299
4300 _offset.dump2(st);
4301
4302 st->print(" *");
4303 if (_instance_id == InstanceTop)
4304 st->print(",iid=top");
4305 else if (_instance_id != InstanceBot)
4306 st->print(",iid=%d",_instance_id);
4307
4308 dump_inline_depth(st);
4309 dump_speculative(st);
4310 }
4311 #endif
4312
4313 //------------------------------add_offset-------------------------------------
4314 const TypePtr *TypeInstPtr::add_offset(intptr_t offset) const {
4315 return make(_ptr, klass(), klass_is_exact(), const_oop(), xadd_offset(offset),
4316 _instance_id, add_offset_speculative(offset), _inline_depth);
4317 }
4318
4319 const Type *TypeInstPtr::remove_speculative() const {
4320 if (_speculative == NULL) {
4321 return this;
4322 }
4323 assert(_inline_depth == InlineDepthTop || _inline_depth == InlineDepthBottom, "non speculative type shouldn't have inline depth");
4324 return make(_ptr, klass(), klass_is_exact(), const_oop(), _offset,
4325 _instance_id, NULL, _inline_depth);
4326 }
4327
4328 const TypePtr *TypeInstPtr::with_inline_depth(int depth) const {
4329 if (!UseInlineDepthForSpeculativeTypes) {
4330 return this;
4331 }
4332 return make(_ptr, klass(), klass_is_exact(), const_oop(), _offset, _instance_id, _speculative, depth);
4333 }
4334
4335 const TypePtr *TypeInstPtr::with_instance_id(int instance_id) const {
4336 assert(is_known_instance(), "should be known");
4337 return make(_ptr, klass(), klass_is_exact(), const_oop(), _offset, instance_id, _speculative, _inline_depth);
4338 }
4339
4340 //=============================================================================
4341 // Convenience common pre-built types.
4342 const TypeAryPtr *TypeAryPtr::RANGE;
4343 const TypeAryPtr *TypeAryPtr::OOPS;
4344 const TypeAryPtr *TypeAryPtr::NARROWOOPS;
4345 const TypeAryPtr *TypeAryPtr::BYTES;
4346 const TypeAryPtr *TypeAryPtr::SHORTS;
4347 const TypeAryPtr *TypeAryPtr::CHARS;
4348 const TypeAryPtr *TypeAryPtr::INTS;
4349 const TypeAryPtr *TypeAryPtr::LONGS;
4350 const TypeAryPtr *TypeAryPtr::FLOATS;
4351 const TypeAryPtr *TypeAryPtr::DOUBLES;
4352
4353 //------------------------------make-------------------------------------------
4354 const TypeAryPtr* TypeAryPtr::make(PTR ptr, const TypeAry *ary, ciKlass* k, bool xk, Offset offset, Offset field_offset,
4355 int instance_id, const TypePtr* speculative, int inline_depth) {
4356 assert(!(k == NULL && ary->_elem->isa_int()),
4357 "integral arrays must be pre-equipped with a class");
4358 if (!xk) xk = ary->ary_must_be_exact();
4359 assert(instance_id <= 0 || xk || !UseExactTypes, "instances are always exactly typed");
4360 if (!UseExactTypes) xk = (ptr == Constant);
4361 return (TypeAryPtr*)(new TypeAryPtr(ptr, NULL, ary, k, xk, offset, field_offset, instance_id, false, speculative, inline_depth))->hashcons();
4362 }
4363
4364 //------------------------------make-------------------------------------------
4365 const TypeAryPtr* TypeAryPtr::make(PTR ptr, ciObject* o, const TypeAry *ary, ciKlass* k, bool xk, Offset offset, Offset field_offset,
4366 int instance_id, const TypePtr* speculative, int inline_depth,
4367 bool is_autobox_cache) {
4368 assert(!(k == NULL && ary->_elem->isa_int()),
4369 "integral arrays must be pre-equipped with a class");
4370 assert( (ptr==Constant && o) || (ptr!=Constant && !o), "" );
4371 if (!xk) xk = (o != NULL) || ary->ary_must_be_exact();
4372 assert(instance_id <= 0 || xk || !UseExactTypes, "instances are always exactly typed");
4373 if (!UseExactTypes) xk = (ptr == Constant);
4374 return (TypeAryPtr*)(new TypeAryPtr(ptr, o, ary, k, xk, offset, field_offset, instance_id, is_autobox_cache, speculative, inline_depth))->hashcons();
4375 }
4376
4377 //------------------------------cast_to_ptr_type-------------------------------
4378 const Type *TypeAryPtr::cast_to_ptr_type(PTR ptr) const {
4379 if( ptr == _ptr ) return this;
4380 return make(ptr, const_oop(), _ary, klass(), klass_is_exact(), _offset, _field_offset, _instance_id, _speculative, _inline_depth, _is_autobox_cache);
4381 }
4382
4383
4384 //-----------------------------cast_to_exactness-------------------------------
4385 const Type *TypeAryPtr::cast_to_exactness(bool klass_is_exact) const {
4386 if( klass_is_exact == _klass_is_exact ) return this;
4387 if (!UseExactTypes) return this;
4388 if (_ary->ary_must_be_exact()) return this; // cannot clear xk
4389 return make(ptr(), const_oop(), _ary, klass(), klass_is_exact, _offset, _field_offset, _instance_id, _speculative, _inline_depth, _is_autobox_cache);
4390 }
4391
4392 //-----------------------------cast_to_instance_id----------------------------
4393 const TypeOopPtr *TypeAryPtr::cast_to_instance_id(int instance_id) const {
4394 if( instance_id == _instance_id ) return this;
4395 return make(_ptr, const_oop(), _ary, klass(), _klass_is_exact, _offset, _field_offset, instance_id, _speculative, _inline_depth, _is_autobox_cache);
4396 }
4397
4398 const TypeOopPtr *TypeAryPtr::cast_to_nonconst() const {
4399 if (const_oop() == NULL) return this;
4400 return make(NotNull, NULL, _ary, klass(), _klass_is_exact, _offset, _field_offset, _instance_id, _speculative, _inline_depth);
4401 }
4402
4403
4404 //-----------------------------narrow_size_type-------------------------------
4405 // Local cache for arrayOopDesc::max_array_length(etype),
4406 // which is kind of slow (and cached elsewhere by other users).
4407 static jint max_array_length_cache[T_CONFLICT+1];
4408 static jint max_array_length(BasicType etype) {
4409 jint& cache = max_array_length_cache[etype];
4410 jint res = cache;
4411 if (res == 0) {
4412 switch (etype) {
4413 case T_NARROWOOP:
4414 etype = T_OBJECT;
4415 break;
4416 case T_NARROWKLASS:
4417 case T_CONFLICT:
4418 case T_ILLEGAL:
4419 case T_VOID:
4420 etype = T_BYTE; // will produce conservatively high value
4421 break;
4422 default:
4423 break;
4424 }
4425 cache = res = arrayOopDesc::max_array_length(etype);
4426 }
4427 return res;
4428 }
4429
4430 // Narrow the given size type to the index range for the given array base type.
4431 // Return NULL if the resulting int type becomes empty.
4432 const TypeInt* TypeAryPtr::narrow_size_type(const TypeInt* size) const {
4433 jint hi = size->_hi;
4434 jint lo = size->_lo;
4435 jint min_lo = 0;
4436 jint max_hi = max_array_length(elem()->basic_type());
4437 //if (index_not_size) --max_hi; // type of a valid array index, FTR
4438 bool chg = false;
4439 if (lo < min_lo) {
4440 lo = min_lo;
4441 if (size->is_con()) {
4442 hi = lo;
4443 }
4444 chg = true;
4445 }
4446 if (hi > max_hi) {
4447 hi = max_hi;
4448 if (size->is_con()) {
4449 lo = hi;
4450 }
4451 chg = true;
4452 }
4453 // Negative length arrays will produce weird intermediate dead fast-path code
4454 if (lo > hi)
4455 return TypeInt::ZERO;
4456 if (!chg)
4457 return size;
4458 return TypeInt::make(lo, hi, Type::WidenMin);
4459 }
4460
4461 //-------------------------------cast_to_size----------------------------------
4462 const TypeAryPtr* TypeAryPtr::cast_to_size(const TypeInt* new_size) const {
4463 assert(new_size != NULL, "");
4464 new_size = narrow_size_type(new_size);
4465 if (new_size == size()) return this;
4466 const TypeAry* new_ary = TypeAry::make(elem(), new_size, is_stable());
4467 return make(ptr(), const_oop(), new_ary, klass(), klass_is_exact(), _offset, _field_offset, _instance_id, _speculative, _inline_depth, _is_autobox_cache);
4468 }
4469
4470 //------------------------------cast_to_stable---------------------------------
4471 const TypeAryPtr* TypeAryPtr::cast_to_stable(bool stable, int stable_dimension) const {
4472 if (stable_dimension <= 0 || (stable_dimension == 1 && stable == this->is_stable()))
4473 return this;
4474
4475 const Type* elem = this->elem();
4476 const TypePtr* elem_ptr = elem->make_ptr();
4477
4478 if (stable_dimension > 1 && elem_ptr != NULL && elem_ptr->isa_aryptr()) {
4479 // If this is widened from a narrow oop, TypeAry::make will re-narrow it.
4480 elem = elem_ptr = elem_ptr->is_aryptr()->cast_to_stable(stable, stable_dimension - 1);
4481 }
4482
4483 const TypeAry* new_ary = TypeAry::make(elem, size(), stable);
4484
4485 return make(ptr(), const_oop(), new_ary, klass(), klass_is_exact(), _offset, _field_offset, _instance_id, _speculative, _inline_depth, _is_autobox_cache);
4486 }
4487
4488 //-----------------------------stable_dimension--------------------------------
4489 int TypeAryPtr::stable_dimension() const {
4490 if (!is_stable()) return 0;
4491 int dim = 1;
4492 const TypePtr* elem_ptr = elem()->make_ptr();
4493 if (elem_ptr != NULL && elem_ptr->isa_aryptr())
4494 dim += elem_ptr->is_aryptr()->stable_dimension();
4495 return dim;
4496 }
4497
4498 //----------------------cast_to_autobox_cache-----------------------------------
4499 const TypeAryPtr* TypeAryPtr::cast_to_autobox_cache(bool cache) const {
4500 if (is_autobox_cache() == cache) return this;
4501 const TypeOopPtr* etype = elem()->make_oopptr();
4502 if (etype == NULL) return this;
4503 // The pointers in the autobox arrays are always non-null.
4504 TypePtr::PTR ptr_type = cache ? TypePtr::NotNull : TypePtr::AnyNull;
4505 etype = etype->cast_to_ptr_type(TypePtr::NotNull)->is_oopptr();
4506 const TypeAry* new_ary = TypeAry::make(etype, size(), is_stable());
4507 return make(ptr(), const_oop(), new_ary, klass(), klass_is_exact(), _offset, _field_offset, _instance_id, _speculative, _inline_depth, cache);
4508 }
4509
4510 //------------------------------eq---------------------------------------------
4511 // Structural equality check for Type representations
4512 bool TypeAryPtr::eq( const Type *t ) const {
4513 const TypeAryPtr *p = t->is_aryptr();
4514 return
4515 _ary == p->_ary && // Check array
4516 TypeOopPtr::eq(p) &&// Check sub-parts
4517 _field_offset == p->_field_offset;
4518 }
4519
4520 //------------------------------hash-------------------------------------------
4521 // Type-specific hashing function.
4522 int TypeAryPtr::hash(void) const {
4523 return (intptr_t)_ary + TypeOopPtr::hash() + _field_offset.get();
4524 }
4525
4526 //------------------------------meet-------------------------------------------
4527 // Compute the MEET of two types. It returns a new Type object.
4528 const Type *TypeAryPtr::xmeet_helper(const Type *t) const {
4529 // Perform a fast test for common case; meeting the same types together.
4530 if( this == t ) return this; // Meeting same type-rep?
4531 // Current "this->_base" is Pointer
4532 switch (t->base()) { // switch on original type
4533
4534 // Mixing ints & oops happens when javac reuses local variables
4535 case Int:
4536 case Long:
4537 case FloatTop:
4538 case FloatCon:
4539 case FloatBot:
4540 case DoubleTop:
4541 case DoubleCon:
4542 case DoubleBot:
4543 case NarrowOop:
4544 case NarrowKlass:
4545 case Bottom: // Ye Olde Default
4546 return Type::BOTTOM;
4547 case Top:
4548 return this;
4549
4550 default: // All else is a mistake
4551 typerr(t);
4552
4553 case OopPtr: { // Meeting to OopPtrs
4554 // Found a OopPtr type vs self-AryPtr type
4555 const TypeOopPtr *tp = t->is_oopptr();
4556 Offset offset = meet_offset(tp->offset());
4557 PTR ptr = meet_ptr(tp->ptr());
4558 int depth = meet_inline_depth(tp->inline_depth());
4559 const TypePtr* speculative = xmeet_speculative(tp);
4560 switch (tp->ptr()) {
4561 case TopPTR:
4562 case AnyNull: {
4563 int instance_id = meet_instance_id(InstanceTop);
4564 return make(ptr, (ptr == Constant ? const_oop() : NULL),
4565 _ary, _klass, _klass_is_exact, offset, _field_offset, instance_id, speculative, depth);
4566 }
4567 case BotPTR:
4568 case NotNull: {
4569 int instance_id = meet_instance_id(tp->instance_id());
4570 return TypeOopPtr::make(ptr, offset, instance_id, speculative, depth);
4571 }
4572 default: ShouldNotReachHere();
4573 }
4574 }
4575
4576 case AnyPtr: { // Meeting two AnyPtrs
4577 // Found an AnyPtr type vs self-AryPtr type
4578 const TypePtr *tp = t->is_ptr();
4579 Offset offset = meet_offset(tp->offset());
4580 PTR ptr = meet_ptr(tp->ptr());
4581 const TypePtr* speculative = xmeet_speculative(tp);
4582 int depth = meet_inline_depth(tp->inline_depth());
4583 switch (tp->ptr()) {
4584 case TopPTR:
4585 return this;
4586 case BotPTR:
4587 case NotNull:
4588 return TypePtr::make(AnyPtr, ptr, offset, speculative, depth);
4589 case Null:
4590 if( ptr == Null ) return TypePtr::make(AnyPtr, ptr, offset, speculative, depth);
4591 // else fall through to AnyNull
4592 case AnyNull: {
4593 int instance_id = meet_instance_id(InstanceTop);
4594 return make(ptr, (ptr == Constant ? const_oop() : NULL),
4595 _ary, _klass, _klass_is_exact, offset, _field_offset, instance_id, speculative, depth);
4596 }
4597 default: ShouldNotReachHere();
4598 }
4599 }
4600
4601 case MetadataPtr:
4602 case KlassPtr:
4603 case RawPtr: return TypePtr::BOTTOM;
4604
4605 case AryPtr: { // Meeting 2 references?
4606 const TypeAryPtr *tap = t->is_aryptr();
4607 Offset off = meet_offset(tap->offset());
4608 Offset field_off = meet_field_offset(tap->field_offset());
4609 const TypeAry *tary = _ary->meet_speculative(tap->_ary)->is_ary();
4610 PTR ptr = meet_ptr(tap->ptr());
4611 int instance_id = meet_instance_id(tap->instance_id());
4612 const TypePtr* speculative = xmeet_speculative(tap);
4613 int depth = meet_inline_depth(tap->inline_depth());
4614 ciKlass* lazy_klass = NULL;
4615 if (tary->_elem->isa_int()) {
4616 // Integral array element types have irrelevant lattice relations.
4617 // It is the klass that determines array layout, not the element type.
4618 if (_klass == NULL)
4619 lazy_klass = tap->_klass;
4620 else if (tap->_klass == NULL || tap->_klass == _klass) {
4621 lazy_klass = _klass;
4622 } else {
4623 // Something like byte[int+] meets char[int+].
4624 // This must fall to bottom, not (int[-128..65535])[int+].
4625 instance_id = InstanceBot;
4626 tary = TypeAry::make(Type::BOTTOM, tary->_size, tary->_stable);
4627 }
4628 } else if (klass() != NULL && tap->klass() != NULL &&
4629 klass()->as_array_klass()->storage_properties().value() != tap->klass()->as_array_klass()->storage_properties().value()) {
4630 // Meeting value type arrays with conflicting storage properties
4631 if (tary->_elem->isa_valuetype()) {
4632 // Result is flattened
4633 off = Offset(elem()->isa_valuetype() ? offset() : tap->offset());
4634 field_off = elem()->isa_valuetype() ? field_offset() : tap->field_offset();
4635 } else if (tary->_elem->make_oopptr() != NULL && tary->_elem->make_oopptr()->isa_instptr() && below_centerline(ptr)) {
4636 // Result is non-flattened
4637 off = Offset(flattened_offset()).meet(Offset(tap->flattened_offset()));
4638 field_off = Offset::bottom;
4639 }
4640 } else // Non integral arrays.
4641 // Must fall to bottom if exact klasses in upper lattice
4642 // are not equal or super klass is exact.
4643 if ((above_centerline(ptr) || ptr == Constant) && klass() != tap->klass() &&
4644 // meet with top[] and bottom[] are processed further down:
4645 tap->_klass != NULL && this->_klass != NULL &&
4646 // both are exact and not equal:
4647 ((tap->_klass_is_exact && this->_klass_is_exact) ||
4648 // 'tap' is exact and super or unrelated:
4649 (tap->_klass_is_exact && !tap->klass()->is_subtype_of(klass())) ||
4650 // 'this' is exact and super or unrelated:
4651 (this->_klass_is_exact && !klass()->is_subtype_of(tap->klass())))) {
4652 if (above_centerline(ptr)) {
4653 tary = TypeAry::make(Type::BOTTOM, tary->_size, tary->_stable);
4654 }
4655 return make(NotNull, NULL, tary, lazy_klass, false, off, field_off, InstanceBot, speculative, depth);
4656 }
4657
4658 bool xk = false;
4659 switch (tap->ptr()) {
4660 case AnyNull:
4661 case TopPTR:
4662 // Compute new klass on demand, do not use tap->_klass
4663 if (below_centerline(this->_ptr)) {
4664 xk = this->_klass_is_exact;
4665 } else {
4666 xk = (tap->_klass_is_exact | this->_klass_is_exact);
4667 }
4668 return make(ptr, const_oop(), tary, lazy_klass, xk, off, field_off, instance_id, speculative, depth);
4669 case Constant: {
4670 ciObject* o = const_oop();
4671 if( _ptr == Constant ) {
4672 if( tap->const_oop() != NULL && !o->equals(tap->const_oop()) ) {
4673 xk = (klass() == tap->klass());
4674 ptr = NotNull;
4675 o = NULL;
4676 instance_id = InstanceBot;
4677 } else {
4678 xk = true;
4679 }
4680 } else if(above_centerline(_ptr)) {
4681 o = tap->const_oop();
4682 xk = true;
4683 } else {
4684 // Only precise for identical arrays
4685 xk = this->_klass_is_exact && (klass() == tap->klass());
4686 }
4687 return TypeAryPtr::make(ptr, o, tary, lazy_klass, xk, off, field_off, instance_id, speculative, depth);
4688 }
4689 case NotNull:
4690 case BotPTR:
4691 // Compute new klass on demand, do not use tap->_klass
4692 if (above_centerline(this->_ptr))
4693 xk = tap->_klass_is_exact;
4694 else xk = (tap->_klass_is_exact & this->_klass_is_exact) &&
4695 (klass() == tap->klass()); // Only precise for identical arrays
4696 return TypeAryPtr::make(ptr, NULL, tary, lazy_klass, xk, off, field_off, instance_id, speculative, depth);
4697 default: ShouldNotReachHere();
4698 }
4699 }
4700
4701 // All arrays inherit from Object class
4702 case InstPtr: {
4703 const TypeInstPtr *tp = t->is_instptr();
4704 Offset offset = meet_offset(tp->offset());
4705 PTR ptr = meet_ptr(tp->ptr());
4706 int instance_id = meet_instance_id(tp->instance_id());
4707 const TypePtr* speculative = xmeet_speculative(tp);
4708 int depth = meet_inline_depth(tp->inline_depth());
4709 switch (ptr) {
4710 case TopPTR:
4711 case AnyNull: // Fall 'down' to dual of object klass
4712 // For instances when a subclass meets a superclass we fall
4713 // below the centerline when the superclass is exact. We need to
4714 // do the same here.
4715 if (tp->klass()->equals(ciEnv::current()->Object_klass()) && !tp->klass_is_exact()) {
4716 return TypeAryPtr::make(ptr, _ary, _klass, _klass_is_exact, offset, _field_offset, instance_id, speculative, depth);
4717 } else {
4718 // cannot subclass, so the meet has to fall badly below the centerline
4719 ptr = NotNull;
4720 instance_id = InstanceBot;
4721 return TypeInstPtr::make(ptr, ciEnv::current()->Object_klass(), false, NULL, offset, instance_id, speculative, depth);
4722 }
4723 case Constant:
4724 case NotNull:
4725 case BotPTR: // Fall down to object klass
4726 // LCA is object_klass, but if we subclass from the top we can do better
4727 if (above_centerline(tp->ptr())) {
4728 // If 'tp' is above the centerline and it is Object class
4729 // then we can subclass in the Java class hierarchy.
4730 // For instances when a subclass meets a superclass we fall
4731 // below the centerline when the superclass is exact. We need
4732 // to do the same here.
4733 if (tp->klass()->equals(ciEnv::current()->Object_klass()) && !tp->klass_is_exact()) {
4734 // that is, my array type is a subtype of 'tp' klass
4735 return make(ptr, (ptr == Constant ? const_oop() : NULL),
4736 _ary, _klass, _klass_is_exact, offset, _field_offset, instance_id, speculative, depth);
4737 }
4738 }
4739 // The other case cannot happen, since t cannot be a subtype of an array.
4740 // The meet falls down to Object class below centerline.
4741 if( ptr == Constant )
4742 ptr = NotNull;
4743 instance_id = InstanceBot;
4744 return TypeInstPtr::make(ptr, ciEnv::current()->Object_klass(), false, NULL, offset, instance_id, speculative, depth);
4745 default: typerr(t);
4746 }
4747 }
4748
4749 case ValueType: {
4750 // All value types inherit from Object
4751 PTR ptr = this->_ptr;
4752 if (ptr == Constant) {
4753 ptr = NotNull;
4754 }
4755 return TypeInstPtr::make(ptr, ciEnv::current()->Object_klass());
4756 }
4757
4758 }
4759 return this; // Lint noise
4760 }
4761
4762 //------------------------------xdual------------------------------------------
4763 // Dual: compute field-by-field dual
4764 const Type *TypeAryPtr::xdual() const {
4765 return new TypeAryPtr(dual_ptr(), _const_oop, _ary->dual()->is_ary(), _klass, _klass_is_exact, dual_offset(), dual_field_offset(), dual_instance_id(), is_autobox_cache(), dual_speculative(), dual_inline_depth());
4766 }
4767
4768 Type::Offset TypeAryPtr::meet_field_offset(const Type::Offset offset) const {
4769 return _field_offset.meet(offset);
4770 }
4771
4772 //------------------------------dual_offset------------------------------------
4773 Type::Offset TypeAryPtr::dual_field_offset() const {
4774 return _field_offset.dual();
4775 }
4776
4777 //----------------------interface_vs_oop---------------------------------------
4778 #ifdef ASSERT
4779 bool TypeAryPtr::interface_vs_oop(const Type *t) const {
4780 const TypeAryPtr* t_aryptr = t->isa_aryptr();
4781 if (t_aryptr) {
4782 return _ary->interface_vs_oop(t_aryptr->_ary);
4783 }
4784 return false;
4785 }
4786 #endif
4787
4788 //------------------------------dump2------------------------------------------
4789 #ifndef PRODUCT
4790 void TypeAryPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
4791 _ary->dump2(d,depth,st);
4792 switch( _ptr ) {
4793 case Constant:
4794 const_oop()->print(st);
4795 break;
4796 case BotPTR:
4797 if (!WizardMode && !Verbose) {
4798 if( _klass_is_exact ) st->print(":exact");
4799 break;
4800 }
4801 case TopPTR:
4802 case AnyNull:
4803 case NotNull:
4804 st->print(":%s", ptr_msg[_ptr]);
4805 if( _klass_is_exact ) st->print(":exact");
4806 break;
4807 default:
4808 break;
4809 }
4810
4811 if (elem()->isa_valuetype()) {
4812 st->print("(");
4813 _field_offset.dump2(st);
4814 st->print(")");
4815 }
4816 if (offset() != 0) {
4817 int header_size = objArrayOopDesc::header_size() * wordSize;
4818 if( _offset == Offset::top ) st->print("+undefined");
4819 else if( _offset == Offset::bottom ) st->print("+any");
4820 else if( offset() < header_size ) st->print("+%d", offset());
4821 else {
4822 BasicType basic_elem_type = elem()->basic_type();
4823 int array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
4824 int elem_size = type2aelembytes(basic_elem_type);
4825 st->print("[%d]", (offset() - array_base)/elem_size);
4826 }
4827 }
4828 st->print(" *");
4829 if (_instance_id == InstanceTop)
4830 st->print(",iid=top");
4831 else if (_instance_id != InstanceBot)
4832 st->print(",iid=%d",_instance_id);
4833
4834 dump_inline_depth(st);
4835 dump_speculative(st);
4836 }
4837 #endif
4838
4839 bool TypeAryPtr::empty(void) const {
4840 if (_ary->empty()) return true;
4841 return TypeOopPtr::empty();
4842 }
4843
4844 //------------------------------add_offset-------------------------------------
4845 const TypePtr *TypeAryPtr::add_offset(intptr_t offset) const {
4846 return make(_ptr, _const_oop, _ary, _klass, _klass_is_exact, xadd_offset(offset), _field_offset, _instance_id, add_offset_speculative(offset), _inline_depth, _is_autobox_cache);
4847 }
4848
4849 const Type *TypeAryPtr::remove_speculative() const {
4850 if (_speculative == NULL) {
4851 return this;
4852 }
4853 assert(_inline_depth == InlineDepthTop || _inline_depth == InlineDepthBottom, "non speculative type shouldn't have inline depth");
4854 return make(_ptr, _const_oop, _ary->remove_speculative()->is_ary(), _klass, _klass_is_exact, _offset, _field_offset, _instance_id, NULL, _inline_depth, _is_autobox_cache);
4855 }
4856
4857 const TypePtr *TypeAryPtr::with_inline_depth(int depth) const {
4858 if (!UseInlineDepthForSpeculativeTypes) {
4859 return this;
4860 }
4861 return make(_ptr, _const_oop, _ary->remove_speculative()->is_ary(), _klass, _klass_is_exact, _offset, _field_offset, _instance_id, _speculative, depth, _is_autobox_cache);
4862 }
4863
4864 const TypeAryPtr* TypeAryPtr::with_field_offset(int offset) const {
4865 return make(_ptr, _const_oop, _ary->remove_speculative()->is_ary(), _klass, _klass_is_exact, _offset, Offset(offset), _instance_id, _speculative, _inline_depth, _is_autobox_cache);
4866 }
4867
4868 const TypePtr* TypeAryPtr::add_field_offset_and_offset(intptr_t offset) const {
4869 int adj = 0;
4870 if (offset != Type::OffsetBot && offset != Type::OffsetTop) {
4871 const Type* elemtype = elem();
4872 if (elemtype->isa_valuetype()) {
4873 if (_offset.get() != OffsetBot && _offset.get() != OffsetTop) {
4874 adj = _offset.get();
4875 offset += _offset.get();
4876 }
4877 uint header = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
4878 if (_field_offset.get() != OffsetBot && _field_offset.get() != OffsetTop) {
4879 offset += _field_offset.get();
4880 if (_offset.get() == OffsetBot || _offset.get() == OffsetTop) {
4881 offset += header;
4882 }
4883 }
4884 if (offset >= (intptr_t)header || offset < 0) {
4885 // Try to get the field of the value type array element we are pointing to
4886 ciKlass* arytype_klass = klass();
4887 ciValueArrayKlass* vak = arytype_klass->as_value_array_klass();
4888 ciValueKlass* vk = vak->element_klass()->as_value_klass();
4889 int shift = vak->log2_element_size();
4890 int mask = (1 << shift) - 1;
4891 intptr_t field_offset = ((offset - header) & mask);
4892 ciField* field = vk->get_field_by_offset(field_offset + vk->first_field_offset(), false);
4893 if (field == NULL) {
4894 // This may happen with nested AddP(base, AddP(base, base, offset), longcon(16))
4895 return add_offset(offset);
4896 } else {
4897 return with_field_offset(field_offset)->add_offset(offset - field_offset - adj);
4898 }
4899 }
4900 }
4901 }
4902 return add_offset(offset - adj);
4903 }
4904
4905 // Return offset incremented by field_offset for flattened value type arrays
4906 const int TypeAryPtr::flattened_offset() const {
4907 int offset = _offset.get();
4908 if (offset != Type::OffsetBot && offset != Type::OffsetTop &&
4909 _field_offset != Offset::bottom && _field_offset != Offset::top) {
4910 offset += _field_offset.get();
4911 }
4912 return offset;
4913 }
4914
4915 const TypePtr *TypeAryPtr::with_instance_id(int instance_id) const {
4916 assert(is_known_instance(), "should be known");
4917 return make(_ptr, _const_oop, _ary->remove_speculative()->is_ary(), _klass, _klass_is_exact, _offset, _field_offset, instance_id, _speculative, _inline_depth);
4918 }
4919
4920 //=============================================================================
4921
4922
4923 //------------------------------hash-------------------------------------------
4924 // Type-specific hashing function.
4925 int TypeNarrowPtr::hash(void) const {
4926 return _ptrtype->hash() + 7;
4927 }
4928
4929 bool TypeNarrowPtr::singleton(void) const { // TRUE if type is a singleton
4930 return _ptrtype->singleton();
4931 }
4932
4933 bool TypeNarrowPtr::empty(void) const {
4934 return _ptrtype->empty();
4935 }
4936
4937 intptr_t TypeNarrowPtr::get_con() const {
4938 return _ptrtype->get_con();
4939 }
4940
4941 bool TypeNarrowPtr::eq( const Type *t ) const {
4942 const TypeNarrowPtr* tc = isa_same_narrowptr(t);
4943 if (tc != NULL) {
4944 if (_ptrtype->base() != tc->_ptrtype->base()) {
4945 return false;
4946 }
4947 return tc->_ptrtype->eq(_ptrtype);
4948 }
4949 return false;
4950 }
4951
4952 const Type *TypeNarrowPtr::xdual() const { // Compute dual right now.
4953 const TypePtr* odual = _ptrtype->dual()->is_ptr();
4954 return make_same_narrowptr(odual);
4955 }
4956
4957
4958 const Type *TypeNarrowPtr::filter_helper(const Type *kills, bool include_speculative) const {
4959 if (isa_same_narrowptr(kills)) {
4960 const Type* ft =_ptrtype->filter_helper(is_same_narrowptr(kills)->_ptrtype, include_speculative);
4961 if (ft->empty())
4962 return Type::TOP; // Canonical empty value
4963 if (ft->isa_ptr()) {
4964 return make_hash_same_narrowptr(ft->isa_ptr());
4965 }
4966 return ft;
4967 } else if (kills->isa_ptr()) {
4968 const Type* ft = _ptrtype->join_helper(kills, include_speculative);
4969 if (ft->empty())
4970 return Type::TOP; // Canonical empty value
4971 return ft;
4972 } else {
4973 return Type::TOP;
4974 }
4975 }
4976
4977 //------------------------------xmeet------------------------------------------
4978 // Compute the MEET of two types. It returns a new Type object.
4979 const Type *TypeNarrowPtr::xmeet( const Type *t ) const {
4980 // Perform a fast test for common case; meeting the same types together.
4981 if( this == t ) return this; // Meeting same type-rep?
4982
4983 if (t->base() == base()) {
4984 const Type* result = _ptrtype->xmeet(t->make_ptr());
4985 if (result->isa_ptr()) {
4986 return make_hash_same_narrowptr(result->is_ptr());
4987 }
4988 return result;
4989 }
4990
4991 // Current "this->_base" is NarrowKlass or NarrowOop
4992 switch (t->base()) { // switch on original type
4993
4994 case Int: // Mixing ints & oops happens when javac
4995 case Long: // reuses local variables
4996 case FloatTop:
4997 case FloatCon:
4998 case FloatBot:
4999 case DoubleTop:
5000 case DoubleCon:
5001 case DoubleBot:
5002 case AnyPtr:
5003 case RawPtr:
5004 case OopPtr:
5005 case InstPtr:
5006 case AryPtr:
5007 case MetadataPtr:
5008 case KlassPtr:
5009 case NarrowOop:
5010 case NarrowKlass:
5011 case Bottom: // Ye Olde Default
5012 return Type::BOTTOM;
5013 case Top:
5014 return this;
5015
5016 case ValueType:
5017 return t->xmeet(this);
5018
5019 default: // All else is a mistake
5020 typerr(t);
5021
5022 } // End of switch
5023
5024 return this;
5025 }
5026
5027 #ifndef PRODUCT
5028 void TypeNarrowPtr::dump2( Dict & d, uint depth, outputStream *st ) const {
5029 _ptrtype->dump2(d, depth, st);
5030 }
5031 #endif
5032
5033 const TypeNarrowOop *TypeNarrowOop::BOTTOM;
5034 const TypeNarrowOop *TypeNarrowOop::NULL_PTR;
5035
5036
5037 const TypeNarrowOop* TypeNarrowOop::make(const TypePtr* type) {
5038 return (const TypeNarrowOop*)(new TypeNarrowOop(type))->hashcons();
5039 }
5040
5041 const Type* TypeNarrowOop::remove_speculative() const {
5042 return make(_ptrtype->remove_speculative()->is_ptr());
5043 }
5044
5045 const Type* TypeNarrowOop::cleanup_speculative() const {
5046 return make(_ptrtype->cleanup_speculative()->is_ptr());
5047 }
5048
5049 #ifndef PRODUCT
5050 void TypeNarrowOop::dump2( Dict & d, uint depth, outputStream *st ) const {
5051 st->print("narrowoop: ");
5052 TypeNarrowPtr::dump2(d, depth, st);
5053 }
5054 #endif
5055
5056 const TypeNarrowKlass *TypeNarrowKlass::NULL_PTR;
5057
5058 const TypeNarrowKlass* TypeNarrowKlass::make(const TypePtr* type) {
5059 return (const TypeNarrowKlass*)(new TypeNarrowKlass(type))->hashcons();
5060 }
5061
5062 #ifndef PRODUCT
5063 void TypeNarrowKlass::dump2( Dict & d, uint depth, outputStream *st ) const {
5064 st->print("narrowklass: ");
5065 TypeNarrowPtr::dump2(d, depth, st);
5066 }
5067 #endif
5068
5069
5070 //------------------------------eq---------------------------------------------
5071 // Structural equality check for Type representations
5072 bool TypeMetadataPtr::eq( const Type *t ) const {
5073 const TypeMetadataPtr *a = (const TypeMetadataPtr*)t;
5074 ciMetadata* one = metadata();
5075 ciMetadata* two = a->metadata();
5076 if (one == NULL || two == NULL) {
5077 return (one == two) && TypePtr::eq(t);
5078 } else {
5079 return one->equals(two) && TypePtr::eq(t);
5080 }
5081 }
5082
5083 //------------------------------hash-------------------------------------------
5084 // Type-specific hashing function.
5085 int TypeMetadataPtr::hash(void) const {
5086 return
5087 (metadata() ? metadata()->hash() : 0) +
5088 TypePtr::hash();
5089 }
5090
5091 //------------------------------singleton--------------------------------------
5092 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
5093 // constants
5094 bool TypeMetadataPtr::singleton(void) const {
5095 // detune optimizer to not generate constant metadata + constant offset as a constant!
5096 // TopPTR, Null, AnyNull, Constant are all singletons
5097 return (offset() == 0) && !below_centerline(_ptr);
5098 }
5099
5100 //------------------------------add_offset-------------------------------------
5101 const TypePtr *TypeMetadataPtr::add_offset( intptr_t offset ) const {
5102 return make( _ptr, _metadata, xadd_offset(offset));
5103 }
5104
5105 //-----------------------------filter------------------------------------------
5106 // Do not allow interface-vs.-noninterface joins to collapse to top.
5107 const Type *TypeMetadataPtr::filter_helper(const Type *kills, bool include_speculative) const {
5108 const TypeMetadataPtr* ft = join_helper(kills, include_speculative)->isa_metadataptr();
5109 if (ft == NULL || ft->empty())
5110 return Type::TOP; // Canonical empty value
5111 return ft;
5112 }
5113
5114 //------------------------------get_con----------------------------------------
5115 intptr_t TypeMetadataPtr::get_con() const {
5116 assert( _ptr == Null || _ptr == Constant, "" );
5117 assert(offset() >= 0, "");
5118
5119 if (offset() != 0) {
5120 // After being ported to the compiler interface, the compiler no longer
5121 // directly manipulates the addresses of oops. Rather, it only has a pointer
5122 // to a handle at compile time. This handle is embedded in the generated
5123 // code and dereferenced at the time the nmethod is made. Until that time,
5124 // it is not reasonable to do arithmetic with the addresses of oops (we don't
5125 // have access to the addresses!). This does not seem to currently happen,
5126 // but this assertion here is to help prevent its occurence.
5127 tty->print_cr("Found oop constant with non-zero offset");
5128 ShouldNotReachHere();
5129 }
5130
5131 return (intptr_t)metadata()->constant_encoding();
5132 }
5133
5134 //------------------------------cast_to_ptr_type-------------------------------
5135 const Type *TypeMetadataPtr::cast_to_ptr_type(PTR ptr) const {
5136 if( ptr == _ptr ) return this;
5137 return make(ptr, metadata(), _offset);
5138 }
5139
5140 //------------------------------meet-------------------------------------------
5141 // Compute the MEET of two types. It returns a new Type object.
5142 const Type *TypeMetadataPtr::xmeet( const Type *t ) const {
5143 // Perform a fast test for common case; meeting the same types together.
5144 if( this == t ) return this; // Meeting same type-rep?
5145
5146 // Current "this->_base" is OopPtr
5147 switch (t->base()) { // switch on original type
5148
5149 case Int: // Mixing ints & oops happens when javac
5150 case Long: // reuses local variables
5151 case FloatTop:
5152 case FloatCon:
5153 case FloatBot:
5154 case DoubleTop:
5155 case DoubleCon:
5156 case DoubleBot:
5157 case NarrowOop:
5158 case NarrowKlass:
5159 case Bottom: // Ye Olde Default
5160 return Type::BOTTOM;
5161 case Top:
5162 return this;
5163
5164 default: // All else is a mistake
5165 typerr(t);
5166
5167 case AnyPtr: {
5168 // Found an AnyPtr type vs self-OopPtr type
5169 const TypePtr *tp = t->is_ptr();
5170 Offset offset = meet_offset(tp->offset());
5171 PTR ptr = meet_ptr(tp->ptr());
5172 switch (tp->ptr()) {
5173 case Null:
5174 if (ptr == Null) return TypePtr::make(AnyPtr, ptr, offset, tp->speculative(), tp->inline_depth());
5175 // else fall through:
5176 case TopPTR:
5177 case AnyNull: {
5178 return make(ptr, _metadata, offset);
5179 }
5180 case BotPTR:
5181 case NotNull:
5182 return TypePtr::make(AnyPtr, ptr, offset, tp->speculative(), tp->inline_depth());
5183 default: typerr(t);
5184 }
5185 }
5186
5187 case RawPtr:
5188 case KlassPtr:
5189 case OopPtr:
5190 case InstPtr:
5191 case AryPtr:
5192 return TypePtr::BOTTOM; // Oop meet raw is not well defined
5193
5194 case MetadataPtr: {
5195 const TypeMetadataPtr *tp = t->is_metadataptr();
5196 Offset offset = meet_offset(tp->offset());
5197 PTR tptr = tp->ptr();
5198 PTR ptr = meet_ptr(tptr);
5199 ciMetadata* md = (tptr == TopPTR) ? metadata() : tp->metadata();
5200 if (tptr == TopPTR || _ptr == TopPTR ||
5201 metadata()->equals(tp->metadata())) {
5202 return make(ptr, md, offset);
5203 }
5204 // metadata is different
5205 if( ptr == Constant ) { // Cannot be equal constants, so...
5206 if( tptr == Constant && _ptr != Constant) return t;
5207 if( _ptr == Constant && tptr != Constant) return this;
5208 ptr = NotNull; // Fall down in lattice
5209 }
5210 return make(ptr, NULL, offset);
5211 break;
5212 }
5213 } // End of switch
5214 return this; // Return the double constant
5215 }
5216
5217
5218 //------------------------------xdual------------------------------------------
5219 // Dual of a pure metadata pointer.
5220 const Type *TypeMetadataPtr::xdual() const {
5221 return new TypeMetadataPtr(dual_ptr(), metadata(), dual_offset());
5222 }
5223
5224 //------------------------------dump2------------------------------------------
5225 #ifndef PRODUCT
5226 void TypeMetadataPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
5227 st->print("metadataptr:%s", ptr_msg[_ptr]);
5228 if( metadata() ) st->print(INTPTR_FORMAT, p2i(metadata()));
5229 switch (offset()) {
5230 case OffsetTop: st->print("+top"); break;
5231 case OffsetBot: st->print("+any"); break;
5232 case 0: break;
5233 default: st->print("+%d",offset()); break;
5234 }
5235 }
5236 #endif
5237
5238
5239 //=============================================================================
5240 // Convenience common pre-built type.
5241 const TypeMetadataPtr *TypeMetadataPtr::BOTTOM;
5242
5243 TypeMetadataPtr::TypeMetadataPtr(PTR ptr, ciMetadata* metadata, Offset offset):
5244 TypePtr(MetadataPtr, ptr, offset), _metadata(metadata) {
5245 }
5246
5247 const TypeMetadataPtr* TypeMetadataPtr::make(ciMethod* m) {
5248 return make(Constant, m, Offset(0));
5249 }
5250 const TypeMetadataPtr* TypeMetadataPtr::make(ciMethodData* m) {
5251 return make(Constant, m, Offset(0));
5252 }
5253
5254 //------------------------------make-------------------------------------------
5255 // Create a meta data constant
5256 const TypeMetadataPtr* TypeMetadataPtr::make(PTR ptr, ciMetadata* m, Offset offset) {
5257 assert(m == NULL || !m->is_klass(), "wrong type");
5258 return (TypeMetadataPtr*)(new TypeMetadataPtr(ptr, m, offset))->hashcons();
5259 }
5260
5261
5262 //=============================================================================
5263 // Convenience common pre-built types.
5264
5265 // Not-null object klass or below
5266 const TypeKlassPtr *TypeKlassPtr::OBJECT;
5267 const TypeKlassPtr *TypeKlassPtr::OBJECT_OR_NULL;
5268
5269 //------------------------------TypeKlassPtr-----------------------------------
5270 TypeKlassPtr::TypeKlassPtr( PTR ptr, ciKlass* klass, Offset offset )
5271 : TypePtr(KlassPtr, ptr, offset), _klass(klass), _klass_is_exact(ptr == Constant) {
5272 }
5273
5274 //------------------------------make-------------------------------------------
5275 // ptr to klass 'k', if Constant, or possibly to a sub-klass if not a Constant
5276 const TypeKlassPtr* TypeKlassPtr::make(PTR ptr, ciKlass* k, Offset offset) {
5277 assert(k == NULL || k->is_instance_klass() || k->is_array_klass(), "Incorrect type of klass oop");
5278 return (TypeKlassPtr*)(new TypeKlassPtr(ptr, k, offset))->hashcons();
5279 }
5280
5281 //------------------------------eq---------------------------------------------
5282 // Structural equality check for Type representations
5283 bool TypeKlassPtr::eq( const Type *t ) const {
5284 const TypeKlassPtr *p = t->is_klassptr();
5285 return klass() == p->klass() && TypePtr::eq(p);
5286 }
5287
5288 //------------------------------hash-------------------------------------------
5289 // Type-specific hashing function.
5290 int TypeKlassPtr::hash(void) const {
5291 return java_add(klass() != NULL ? klass()->hash() : (jint)0, (jint)TypePtr::hash());
5292 }
5293
5294 //------------------------------singleton--------------------------------------
5295 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
5296 // constants
5297 bool TypeKlassPtr::singleton(void) const {
5298 // detune optimizer to not generate constant klass + constant offset as a constant!
5299 // TopPTR, Null, AnyNull, Constant are all singletons
5300 return (offset() == 0) && !below_centerline(_ptr);
5301 }
5302
5303 // Do not allow interface-vs.-noninterface joins to collapse to top.
5304 const Type *TypeKlassPtr::filter_helper(const Type *kills, bool include_speculative) const {
5305 // logic here mirrors the one from TypeOopPtr::filter. See comments
5306 // there.
5307 const Type* ft = join_helper(kills, include_speculative);
5308 const TypeKlassPtr* ftkp = ft->isa_klassptr();
5309 const TypeKlassPtr* ktkp = kills->isa_klassptr();
5310
5311 if (ft->empty()) {
5312 if (!empty() && ktkp != NULL && ktkp->is_loaded() && ktkp->klass()->is_interface())
5313 return kills; // Uplift to interface
5314
5315 return Type::TOP; // Canonical empty value
5316 }
5317
5318 // Interface klass type could be exact in opposite to interface type,
5319 // return it here instead of incorrect Constant ptr J/L/Object (6894807).
5320 if (ftkp != NULL && ktkp != NULL &&
5321 ftkp->is_loaded() && ftkp->klass()->is_interface() &&
5322 !ftkp->klass_is_exact() && // Keep exact interface klass
5323 ktkp->is_loaded() && !ktkp->klass()->is_interface()) {
5324 return ktkp->cast_to_ptr_type(ftkp->ptr());
5325 }
5326
5327 return ft;
5328 }
5329
5330 //----------------------compute_klass------------------------------------------
5331 // Compute the defining klass for this class
5332 ciKlass* TypeAryPtr::compute_klass(DEBUG_ONLY(bool verify)) const {
5333 // Compute _klass based on element type.
5334 ciKlass* k_ary = NULL;
5335 const TypeAryPtr *tary;
5336 const Type* el = elem();
5337 if (el->isa_narrowoop()) {
5338 el = el->make_ptr();
5339 }
5340
5341 // Get element klass
5342 if (el->isa_instptr()) {
5343 // Compute object array klass from element klass
5344 bool null_free = el->is_valuetypeptr() && el->isa_instptr()->ptr() != TypePtr::TopPTR && !el->isa_instptr()->maybe_null();
5345 k_ary = ciArrayKlass::make(el->is_oopptr()->klass(), null_free);
5346 } else if (el->isa_valuetype()) {
5347 k_ary = ciArrayKlass::make(el->value_klass(), /* null_free */ true);
5348 } else if ((tary = el->isa_aryptr()) != NULL) {
5349 // Compute array klass from element klass
5350 ciKlass* k_elem = tary->klass();
5351 // If element type is something like bottom[], k_elem will be null.
5352 if (k_elem != NULL)
5353 k_ary = ciObjArrayKlass::make(k_elem);
5354 } else if ((el->base() == Type::Top) ||
5355 (el->base() == Type::Bottom)) {
5356 // element type of Bottom occurs from meet of basic type
5357 // and object; Top occurs when doing join on Bottom.
5358 // Leave k_ary at NULL.
5359 } else {
5360 // Cannot compute array klass directly from basic type,
5361 // since subtypes of TypeInt all have basic type T_INT.
5362 #ifdef ASSERT
5363 if (verify && el->isa_int()) {
5364 // Check simple cases when verifying klass.
5365 BasicType bt = T_ILLEGAL;
5366 if (el == TypeInt::BYTE) {
5367 bt = T_BYTE;
5368 } else if (el == TypeInt::SHORT) {
5369 bt = T_SHORT;
5370 } else if (el == TypeInt::CHAR) {
5371 bt = T_CHAR;
5372 } else if (el == TypeInt::INT) {
5373 bt = T_INT;
5374 } else {
5375 return _klass; // just return specified klass
5376 }
5377 return ciTypeArrayKlass::make(bt);
5378 }
5379 #endif
5380 assert(!el->isa_int(),
5381 "integral arrays must be pre-equipped with a class");
5382 // Compute array klass directly from basic type
5383 k_ary = ciTypeArrayKlass::make(el->basic_type());
5384 }
5385 return k_ary;
5386 }
5387
5388 //------------------------------klass------------------------------------------
5389 // Return the defining klass for this class
5390 ciKlass* TypeAryPtr::klass() const {
5391 if( _klass ) return _klass; // Return cached value, if possible
5392
5393 // Oops, need to compute _klass and cache it
5394 ciKlass* k_ary = compute_klass();
5395
5396 if( this != TypeAryPtr::OOPS && this->dual() != TypeAryPtr::OOPS ) {
5397 // The _klass field acts as a cache of the underlying
5398 // ciKlass for this array type. In order to set the field,
5399 // we need to cast away const-ness.
5400 //
5401 // IMPORTANT NOTE: we *never* set the _klass field for the
5402 // type TypeAryPtr::OOPS. This Type is shared between all
5403 // active compilations. However, the ciKlass which represents
5404 // this Type is *not* shared between compilations, so caching
5405 // this value would result in fetching a dangling pointer.
5406 //
5407 // Recomputing the underlying ciKlass for each request is
5408 // a bit less efficient than caching, but calls to
5409 // TypeAryPtr::OOPS->klass() are not common enough to matter.
5410 ((TypeAryPtr*)this)->_klass = k_ary;
5411 if (UseCompressedOops && k_ary != NULL && k_ary->is_obj_array_klass() &&
5412 offset() != 0 && offset() != arrayOopDesc::length_offset_in_bytes()) {
5413 ((TypeAryPtr*)this)->_is_ptr_to_narrowoop = true;
5414 }
5415 }
5416 return k_ary;
5417 }
5418
5419
5420 //------------------------------add_offset-------------------------------------
5421 // Access internals of klass object
5422 const TypePtr *TypeKlassPtr::add_offset( intptr_t offset ) const {
5423 return make( _ptr, klass(), xadd_offset(offset) );
5424 }
5425
5426 //------------------------------cast_to_ptr_type-------------------------------
5427 const Type *TypeKlassPtr::cast_to_ptr_type(PTR ptr) const {
5428 assert(_base == KlassPtr, "subclass must override cast_to_ptr_type");
5429 if( ptr == _ptr ) return this;
5430 return make(ptr, _klass, _offset);
5431 }
5432
5433
5434 //-----------------------------cast_to_exactness-------------------------------
5435 const Type *TypeKlassPtr::cast_to_exactness(bool klass_is_exact) const {
5436 if( klass_is_exact == _klass_is_exact ) return this;
5437 if (!UseExactTypes) return this;
5438 return make(klass_is_exact ? Constant : NotNull, _klass, _offset);
5439 }
5440
5441
5442 //-----------------------------as_instance_type--------------------------------
5443 // Corresponding type for an instance of the given class.
5444 // It will be NotNull, and exact if and only if the klass type is exact.
5445 const TypeOopPtr* TypeKlassPtr::as_instance_type() const {
5446 ciKlass* k = klass();
5447 assert(k != NULL, "klass should not be NULL");
5448 bool xk = klass_is_exact();
5449 //return TypeInstPtr::make(TypePtr::NotNull, k, xk, NULL, 0);
5450 const TypeOopPtr* toop = TypeOopPtr::make_from_klass_raw(k);
5451 guarantee(toop != NULL, "need type for given klass");
5452 toop = toop->cast_to_ptr_type(TypePtr::NotNull)->is_oopptr();
5453 return toop->cast_to_exactness(xk)->is_oopptr();
5454 }
5455
5456
5457 //------------------------------xmeet------------------------------------------
5458 // Compute the MEET of two types, return a new Type object.
5459 const Type *TypeKlassPtr::xmeet( const Type *t ) const {
5460 // Perform a fast test for common case; meeting the same types together.
5461 if( this == t ) return this; // Meeting same type-rep?
5462
5463 // Current "this->_base" is Pointer
5464 switch (t->base()) { // switch on original type
5465
5466 case Int: // Mixing ints & oops happens when javac
5467 case Long: // reuses local variables
5468 case FloatTop:
5469 case FloatCon:
5470 case FloatBot:
5471 case DoubleTop:
5472 case DoubleCon:
5473 case DoubleBot:
5474 case NarrowOop:
5475 case NarrowKlass:
5476 case Bottom: // Ye Olde Default
5477 return Type::BOTTOM;
5478 case Top:
5479 return this;
5480
5481 default: // All else is a mistake
5482 typerr(t);
5483
5484 case AnyPtr: { // Meeting to AnyPtrs
5485 // Found an AnyPtr type vs self-KlassPtr type
5486 const TypePtr *tp = t->is_ptr();
5487 Offset offset = meet_offset(tp->offset());
5488 PTR ptr = meet_ptr(tp->ptr());
5489 switch (tp->ptr()) {
5490 case TopPTR:
5491 return this;
5492 case Null:
5493 if( ptr == Null ) return TypePtr::make(AnyPtr, ptr, offset, tp->speculative(), tp->inline_depth());
5494 case AnyNull:
5495 return make( ptr, klass(), offset );
5496 case BotPTR:
5497 case NotNull:
5498 return TypePtr::make(AnyPtr, ptr, offset, tp->speculative(), tp->inline_depth());
5499 default: typerr(t);
5500 }
5501 }
5502
5503 case RawPtr:
5504 case MetadataPtr:
5505 case OopPtr:
5506 case AryPtr: // Meet with AryPtr
5507 case InstPtr: // Meet with InstPtr
5508 return TypePtr::BOTTOM;
5509
5510 //
5511 // A-top }
5512 // / | \ } Tops
5513 // B-top A-any C-top }
5514 // | / | \ | } Any-nulls
5515 // B-any | C-any }
5516 // | | |
5517 // B-con A-con C-con } constants; not comparable across classes
5518 // | | |
5519 // B-not | C-not }
5520 // | \ | / | } not-nulls
5521 // B-bot A-not C-bot }
5522 // \ | / } Bottoms
5523 // A-bot }
5524 //
5525
5526 case KlassPtr: { // Meet two KlassPtr types
5527 const TypeKlassPtr *tkls = t->is_klassptr();
5528 Offset off = meet_offset(tkls->offset());
5529 PTR ptr = meet_ptr(tkls->ptr());
5530
5531 if (klass() == NULL || tkls->klass() == NULL) {
5532 ciKlass* k = NULL;
5533 if (ptr == Constant) {
5534 k = (klass() == NULL) ? tkls->klass() : klass();
5535 }
5536 return make(ptr, k, off);
5537 }
5538
5539 // Check for easy case; klasses are equal (and perhaps not loaded!)
5540 // If we have constants, then we created oops so classes are loaded
5541 // and we can handle the constants further down. This case handles
5542 // not-loaded classes
5543 if( ptr != Constant && tkls->klass()->equals(klass()) ) {
5544 return make( ptr, klass(), off );
5545 }
5546
5547 // Classes require inspection in the Java klass hierarchy. Must be loaded.
5548 ciKlass* tkls_klass = tkls->klass();
5549 ciKlass* this_klass = this->klass();
5550 assert( tkls_klass->is_loaded(), "This class should have been loaded.");
5551 assert( this_klass->is_loaded(), "This class should have been loaded.");
5552
5553 // If 'this' type is above the centerline and is a superclass of the
5554 // other, we can treat 'this' as having the same type as the other.
5555 if ((above_centerline(this->ptr())) &&
5556 tkls_klass->is_subtype_of(this_klass)) {
5557 this_klass = tkls_klass;
5558 }
5559 // If 'tinst' type is above the centerline and is a superclass of the
5560 // other, we can treat 'tinst' as having the same type as the other.
5561 if ((above_centerline(tkls->ptr())) &&
5562 this_klass->is_subtype_of(tkls_klass)) {
5563 tkls_klass = this_klass;
5564 }
5565
5566 // Check for classes now being equal
5567 if (tkls_klass->equals(this_klass)) {
5568 // If the klasses are equal, the constants may still differ. Fall to
5569 // NotNull if they do (neither constant is NULL; that is a special case
5570 // handled elsewhere).
5571 if( ptr == Constant ) {
5572 if (this->_ptr == Constant && tkls->_ptr == Constant &&
5573 this->klass()->equals(tkls->klass()));
5574 else if (above_centerline(this->ptr()));
5575 else if (above_centerline(tkls->ptr()));
5576 else
5577 ptr = NotNull;
5578 }
5579 return make( ptr, this_klass, off );
5580 } // Else classes are not equal
5581
5582 // Since klasses are different, we require the LCA in the Java
5583 // class hierarchy - which means we have to fall to at least NotNull.
5584 if( ptr == TopPTR || ptr == AnyNull || ptr == Constant )
5585 ptr = NotNull;
5586 // Now we find the LCA of Java classes
5587 ciKlass* k = this_klass->least_common_ancestor(tkls_klass);
5588 return make( ptr, k, off );
5589 } // End of case KlassPtr
5590
5591 } // End of switch
5592 return this; // Return the double constant
5593 }
5594
5595 //------------------------------xdual------------------------------------------
5596 // Dual: compute field-by-field dual
5597 const Type *TypeKlassPtr::xdual() const {
5598 return new TypeKlassPtr( dual_ptr(), klass(), dual_offset() );
5599 }
5600
5601 //------------------------------get_con----------------------------------------
5602 intptr_t TypeKlassPtr::get_con() const {
5603 assert( _ptr == Null || _ptr == Constant, "" );
5604 assert(offset() >= 0, "");
5605
5606 if (offset() != 0) {
5607 // After being ported to the compiler interface, the compiler no longer
5608 // directly manipulates the addresses of oops. Rather, it only has a pointer
5609 // to a handle at compile time. This handle is embedded in the generated
5610 // code and dereferenced at the time the nmethod is made. Until that time,
5611 // it is not reasonable to do arithmetic with the addresses of oops (we don't
5612 // have access to the addresses!). This does not seem to currently happen,
5613 // but this assertion here is to help prevent its occurence.
5614 tty->print_cr("Found oop constant with non-zero offset");
5615 ShouldNotReachHere();
5616 }
5617
5618 return (intptr_t)klass()->constant_encoding();
5619 }
5620 //------------------------------dump2------------------------------------------
5621 // Dump Klass Type
5622 #ifndef PRODUCT
5623 void TypeKlassPtr::dump2( Dict & d, uint depth, outputStream *st ) const {
5624 switch( _ptr ) {
5625 case Constant:
5626 st->print("precise ");
5627 case NotNull:
5628 {
5629 if (klass() != NULL) {
5630 const char* name = klass()->name()->as_utf8();
5631 st->print("klass %s: " INTPTR_FORMAT, name, p2i(klass()));
5632 } else {
5633 st->print("klass BOTTOM");
5634 }
5635 }
5636 case BotPTR:
5637 if( !WizardMode && !Verbose && !_klass_is_exact ) break;
5638 case TopPTR:
5639 case AnyNull:
5640 st->print(":%s", ptr_msg[_ptr]);
5641 if( _klass_is_exact ) st->print(":exact");
5642 break;
5643 default:
5644 break;
5645 }
5646
5647 _offset.dump2(st);
5648
5649 st->print(" *");
5650 }
5651 #endif
5652
5653
5654
5655 //=============================================================================
5656 // Convenience common pre-built types.
5657
5658 //------------------------------make-------------------------------------------
5659 const TypeFunc *TypeFunc::make(const TypeTuple *domain_sig, const TypeTuple* domain_cc,
5660 const TypeTuple *range_sig, const TypeTuple *range_cc) {
5661 return (TypeFunc*)(new TypeFunc(domain_sig, domain_cc, range_sig, range_cc))->hashcons();
5662 }
5663
5664 const TypeFunc *TypeFunc::make(const TypeTuple *domain, const TypeTuple *range) {
5665 return make(domain, domain, range, range);
5666 }
5667
5668 //------------------------------make-------------------------------------------
5669 const TypeFunc *TypeFunc::make(ciMethod* method) {
5670 Compile* C = Compile::current();
5671 const TypeFunc* tf = C->last_tf(method); // check cache
5672 if (tf != NULL) return tf; // The hit rate here is almost 50%.
5673 // Value types are not passed/returned by reference, instead each field of
5674 // the value type is passed/returned as an argument. We maintain two views of
5675 // the argument/return list here: one based on the signature (with a value
5676 // type argument/return as a single slot), one based on the actual calling
5677 // convention (with a value type argument/return as a list of its fields).
5678 const TypeTuple* domain_sig = TypeTuple::make_domain(method, false);
5679 const TypeTuple* domain_cc = TypeTuple::make_domain(method, method->has_scalarized_args());
5680 const TypeTuple* range_sig = TypeTuple::make_range(method->signature(), false);
5681 const TypeTuple* range_cc = TypeTuple::make_range(method->signature(), ValueTypeReturnedAsFields);
5682 tf = TypeFunc::make(domain_sig, domain_cc, range_sig, range_cc);
5683 C->set_last_tf(method, tf); // fill cache
5684 return tf;
5685 }
5686
5687 //------------------------------meet-------------------------------------------
5688 // Compute the MEET of two types. It returns a new Type object.
5689 const Type *TypeFunc::xmeet( const Type *t ) const {
5690 // Perform a fast test for common case; meeting the same types together.
5691 if( this == t ) return this; // Meeting same type-rep?
5692
5693 // Current "this->_base" is Func
5694 switch (t->base()) { // switch on original type
5695
5696 case Bottom: // Ye Olde Default
5697 return t;
5698
5699 default: // All else is a mistake
5700 typerr(t);
5701
5702 case Top:
5703 break;
5704 }
5705 return this; // Return the double constant
5706 }
5707
5708 //------------------------------xdual------------------------------------------
5709 // Dual: compute field-by-field dual
5710 const Type *TypeFunc::xdual() const {
5711 return this;
5712 }
5713
5714 //------------------------------eq---------------------------------------------
5715 // Structural equality check for Type representations
5716 bool TypeFunc::eq( const Type *t ) const {
5717 const TypeFunc *a = (const TypeFunc*)t;
5718 return _domain_sig == a->_domain_sig &&
5719 _domain_cc == a->_domain_cc &&
5720 _range_sig == a->_range_sig &&
5721 _range_cc == a->_range_cc;
5722 }
5723
5724 //------------------------------hash-------------------------------------------
5725 // Type-specific hashing function.
5726 int TypeFunc::hash(void) const {
5727 return (intptr_t)_domain_sig + (intptr_t)_domain_cc + (intptr_t)_range_sig + (intptr_t)_range_cc;
5728 }
5729
5730 //------------------------------dump2------------------------------------------
5731 // Dump Function Type
5732 #ifndef PRODUCT
5733 void TypeFunc::dump2( Dict &d, uint depth, outputStream *st ) const {
5734 if( _range_sig->cnt() <= Parms )
5735 st->print("void");
5736 else {
5737 uint i;
5738 for (i = Parms; i < _range_sig->cnt()-1; i++) {
5739 _range_sig->field_at(i)->dump2(d,depth,st);
5740 st->print("/");
5741 }
5742 _range_sig->field_at(i)->dump2(d,depth,st);
5743 }
5744 st->print(" ");
5745 st->print("( ");
5746 if( !depth || d[this] ) { // Check for recursive dump
5747 st->print("...)");
5748 return;
5749 }
5750 d.Insert((void*)this,(void*)this); // Stop recursion
5751 if (Parms < _domain_sig->cnt())
5752 _domain_sig->field_at(Parms)->dump2(d,depth-1,st);
5753 for (uint i = Parms+1; i < _domain_sig->cnt(); i++) {
5754 st->print(", ");
5755 _domain_sig->field_at(i)->dump2(d,depth-1,st);
5756 }
5757 st->print(" )");
5758 }
5759 #endif
5760
5761 //------------------------------singleton--------------------------------------
5762 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
5763 // constants (Ldi nodes). Singletons are integer, float or double constants
5764 // or a single symbol.
5765 bool TypeFunc::singleton(void) const {
5766 return false; // Never a singleton
5767 }
5768
5769 bool TypeFunc::empty(void) const {
5770 return false; // Never empty
5771 }
5772
5773
5774 BasicType TypeFunc::return_type() const{
5775 if (range_sig()->cnt() == TypeFunc::Parms) {
5776 return T_VOID;
5777 }
5778 return range_sig()->field_at(TypeFunc::Parms)->basic_type();
5779 }