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