1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // Portions of code courtesy of Clifford Click
26
27 // Optimization - Graph Style
28
29 #include "incls/_precompiled.incl"
30 #include "incls/_type.cpp.incl"
31
32 // Dictionary of types shared among compilations.
33 Dict* Type::_shared_type_dict = NULL;
34
35 // Array which maps compiler types to Basic Types
36 const BasicType Type::_basic_type[Type::lastype] = {
37 T_ILLEGAL, // Bad
38 T_ILLEGAL, // Control
39 T_VOID, // Top
40 T_INT, // Int
41 T_LONG, // Long
42 T_VOID, // Half
43 T_NARROWOOP, // NarrowOop
44
45 T_ILLEGAL, // Tuple
46 T_ARRAY, // Array
47
48 T_ADDRESS, // AnyPtr // shows up in factory methods for NULL_PTR
49 T_ADDRESS, // RawPtr
50 T_OBJECT, // OopPtr
51 T_OBJECT, // InstPtr
52 T_OBJECT, // AryPtr
53 T_OBJECT, // KlassPtr
54
55 T_OBJECT, // Function
56 T_ILLEGAL, // Abio
57 T_ADDRESS, // Return_Address
58 T_ILLEGAL, // Memory
59 T_FLOAT, // FloatTop
60 T_FLOAT, // FloatCon
61 T_FLOAT, // FloatBot
62 T_DOUBLE, // DoubleTop
63 T_DOUBLE, // DoubleCon
64 T_DOUBLE, // DoubleBot
65 T_ILLEGAL, // Bottom
66 };
67
68 // Map ideal registers (machine types) to ideal types
69 const Type *Type::mreg2type[_last_machine_leaf];
70
71 // Map basic types to canonical Type* pointers.
72 const Type* Type:: _const_basic_type[T_CONFLICT+1];
73
74 // Map basic types to constant-zero Types.
75 const Type* Type:: _zero_type[T_CONFLICT+1];
76
77 // Map basic types to array-body alias types.
78 const TypeAryPtr* TypeAryPtr::_array_body_type[T_CONFLICT+1];
79
80 //=============================================================================
81 // Convenience common pre-built types.
82 const Type *Type::ABIO; // State-of-machine only
83 const Type *Type::BOTTOM; // All values
84 const Type *Type::CONTROL; // Control only
85 const Type *Type::DOUBLE; // All doubles
86 const Type *Type::FLOAT; // All floats
87 const Type *Type::HALF; // Placeholder half of doublewide type
88 const Type *Type::MEMORY; // Abstract store only
89 const Type *Type::RETURN_ADDRESS;
90 const Type *Type::TOP; // No values in set
91
92 //------------------------------get_const_type---------------------------
93 const Type* Type::get_const_type(ciType* type) {
94 if (type == NULL) {
95 return NULL;
96 } else if (type->is_primitive_type()) {
97 return get_const_basic_type(type->basic_type());
98 } else {
99 return TypeOopPtr::make_from_klass(type->as_klass());
100 }
101 }
102
103 //---------------------------array_element_basic_type---------------------------------
104 // Mapping to the array element's basic type.
105 BasicType Type::array_element_basic_type() const {
106 BasicType bt = basic_type();
107 if (bt == T_INT) {
108 if (this == TypeInt::INT) return T_INT;
109 if (this == TypeInt::CHAR) return T_CHAR;
110 if (this == TypeInt::BYTE) return T_BYTE;
111 if (this == TypeInt::BOOL) return T_BOOLEAN;
112 if (this == TypeInt::SHORT) return T_SHORT;
113 return T_VOID;
114 }
115 return bt;
116 }
117
118 //---------------------------get_typeflow_type---------------------------------
119 // Import a type produced by ciTypeFlow.
120 const Type* Type::get_typeflow_type(ciType* type) {
121 switch (type->basic_type()) {
122
123 case ciTypeFlow::StateVector::T_BOTTOM:
124 assert(type == ciTypeFlow::StateVector::bottom_type(), "");
125 return Type::BOTTOM;
126
127 case ciTypeFlow::StateVector::T_TOP:
128 assert(type == ciTypeFlow::StateVector::top_type(), "");
129 return Type::TOP;
130
131 case ciTypeFlow::StateVector::T_NULL:
132 assert(type == ciTypeFlow::StateVector::null_type(), "");
133 return TypePtr::NULL_PTR;
134
135 case ciTypeFlow::StateVector::T_LONG2:
136 // The ciTypeFlow pass pushes a long, then the half.
137 // We do the same.
138 assert(type == ciTypeFlow::StateVector::long2_type(), "");
139 return TypeInt::TOP;
140
141 case ciTypeFlow::StateVector::T_DOUBLE2:
142 // The ciTypeFlow pass pushes double, then the half.
143 // Our convention is the same.
144 assert(type == ciTypeFlow::StateVector::double2_type(), "");
145 return Type::TOP;
146
147 case T_ADDRESS:
148 assert(type->is_return_address(), "");
149 return TypeRawPtr::make((address)(intptr_t)type->as_return_address()->bci());
150
151 default:
152 // make sure we did not mix up the cases:
153 assert(type != ciTypeFlow::StateVector::bottom_type(), "");
154 assert(type != ciTypeFlow::StateVector::top_type(), "");
155 assert(type != ciTypeFlow::StateVector::null_type(), "");
156 assert(type != ciTypeFlow::StateVector::long2_type(), "");
157 assert(type != ciTypeFlow::StateVector::double2_type(), "");
158 assert(!type->is_return_address(), "");
159
160 return Type::get_const_type(type);
161 }
162 }
163
164
165 //------------------------------make-------------------------------------------
166 // Create a simple Type, with default empty symbol sets. Then hashcons it
167 // and look for an existing copy in the type dictionary.
168 const Type *Type::make( enum TYPES t ) {
169 return (new Type(t))->hashcons();
170 }
171
172 //------------------------------cmp--------------------------------------------
173 int Type::cmp( const Type *const t1, const Type *const t2 ) {
174 if( t1->_base != t2->_base )
175 return 1; // Missed badly
176 assert(t1 != t2 || t1->eq(t2), "eq must be reflexive");
177 return !t1->eq(t2); // Return ZERO if equal
178 }
179
180 //------------------------------hash-------------------------------------------
181 int Type::uhash( const Type *const t ) {
182 return t->hash();
183 }
184
185 //--------------------------Initialize_shared----------------------------------
186 void Type::Initialize_shared(Compile* current) {
187 // This method does not need to be locked because the first system
188 // compilations (stub compilations) occur serially. If they are
189 // changed to proceed in parallel, then this section will need
190 // locking.
191
192 Arena* save = current->type_arena();
193 Arena* shared_type_arena = new Arena();
194
195 current->set_type_arena(shared_type_arena);
196 _shared_type_dict =
197 new (shared_type_arena) Dict( (CmpKey)Type::cmp, (Hash)Type::uhash,
198 shared_type_arena, 128 );
199 current->set_type_dict(_shared_type_dict);
200
201 // Make shared pre-built types.
202 CONTROL = make(Control); // Control only
203 TOP = make(Top); // No values in set
204 MEMORY = make(Memory); // Abstract store only
205 ABIO = make(Abio); // State-of-machine only
206 RETURN_ADDRESS=make(Return_Address);
207 FLOAT = make(FloatBot); // All floats
208 DOUBLE = make(DoubleBot); // All doubles
209 BOTTOM = make(Bottom); // Everything
210 HALF = make(Half); // Placeholder half of doublewide type
211
212 TypeF::ZERO = TypeF::make(0.0); // Float 0 (positive zero)
213 TypeF::ONE = TypeF::make(1.0); // Float 1
214
215 TypeD::ZERO = TypeD::make(0.0); // Double 0 (positive zero)
216 TypeD::ONE = TypeD::make(1.0); // Double 1
217
218 TypeInt::MINUS_1 = TypeInt::make(-1); // -1
219 TypeInt::ZERO = TypeInt::make( 0); // 0
220 TypeInt::ONE = TypeInt::make( 1); // 1
221 TypeInt::BOOL = TypeInt::make(0,1, WidenMin); // 0 or 1, FALSE or TRUE.
222 TypeInt::CC = TypeInt::make(-1, 1, WidenMin); // -1, 0 or 1, condition codes
223 TypeInt::CC_LT = TypeInt::make(-1,-1, WidenMin); // == TypeInt::MINUS_1
224 TypeInt::CC_GT = TypeInt::make( 1, 1, WidenMin); // == TypeInt::ONE
225 TypeInt::CC_EQ = TypeInt::make( 0, 0, WidenMin); // == TypeInt::ZERO
226 TypeInt::CC_LE = TypeInt::make(-1, 0, WidenMin);
227 TypeInt::CC_GE = TypeInt::make( 0, 1, WidenMin); // == TypeInt::BOOL
228 TypeInt::BYTE = TypeInt::make(-128,127, WidenMin); // Bytes
229 TypeInt::UBYTE = TypeInt::make(0, 255, WidenMin); // Unsigned Bytes
230 TypeInt::CHAR = TypeInt::make(0,65535, WidenMin); // Java chars
231 TypeInt::SHORT = TypeInt::make(-32768,32767, WidenMin); // Java shorts
232 TypeInt::POS = TypeInt::make(0,max_jint, WidenMin); // Non-neg values
233 TypeInt::POS1 = TypeInt::make(1,max_jint, WidenMin); // Positive values
234 TypeInt::INT = TypeInt::make(min_jint,max_jint, WidenMax); // 32-bit integers
235 TypeInt::SYMINT = TypeInt::make(-max_jint,max_jint,WidenMin); // symmetric range
236 // CmpL is overloaded both as the bytecode computation returning
237 // a trinary (-1,0,+1) integer result AND as an efficient long
238 // compare returning optimizer ideal-type flags.
239 assert( TypeInt::CC_LT == TypeInt::MINUS_1, "types must match for CmpL to work" );
240 assert( TypeInt::CC_GT == TypeInt::ONE, "types must match for CmpL to work" );
241 assert( TypeInt::CC_EQ == TypeInt::ZERO, "types must match for CmpL to work" );
242 assert( TypeInt::CC_GE == TypeInt::BOOL, "types must match for CmpL to work" );
243
244 TypeLong::MINUS_1 = TypeLong::make(-1); // -1
245 TypeLong::ZERO = TypeLong::make( 0); // 0
246 TypeLong::ONE = TypeLong::make( 1); // 1
247 TypeLong::POS = TypeLong::make(0,max_jlong, WidenMin); // Non-neg values
248 TypeLong::LONG = TypeLong::make(min_jlong,max_jlong,WidenMax); // 64-bit integers
249 TypeLong::INT = TypeLong::make((jlong)min_jint,(jlong)max_jint,WidenMin);
250 TypeLong::UINT = TypeLong::make(0,(jlong)max_juint,WidenMin);
251
252 const Type **fboth =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
253 fboth[0] = Type::CONTROL;
254 fboth[1] = Type::CONTROL;
255 TypeTuple::IFBOTH = TypeTuple::make( 2, fboth );
256
257 const Type **ffalse =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
258 ffalse[0] = Type::CONTROL;
259 ffalse[1] = Type::TOP;
260 TypeTuple::IFFALSE = TypeTuple::make( 2, ffalse );
261
262 const Type **fneither =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
263 fneither[0] = Type::TOP;
264 fneither[1] = Type::TOP;
265 TypeTuple::IFNEITHER = TypeTuple::make( 2, fneither );
266
267 const Type **ftrue =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
268 ftrue[0] = Type::TOP;
269 ftrue[1] = Type::CONTROL;
270 TypeTuple::IFTRUE = TypeTuple::make( 2, ftrue );
271
272 const Type **floop =(const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
273 floop[0] = Type::CONTROL;
274 floop[1] = TypeInt::INT;
275 TypeTuple::LOOPBODY = TypeTuple::make( 2, floop );
276
277 TypePtr::NULL_PTR= TypePtr::make( AnyPtr, TypePtr::Null, 0 );
278 TypePtr::NOTNULL = TypePtr::make( AnyPtr, TypePtr::NotNull, OffsetBot );
279 TypePtr::BOTTOM = TypePtr::make( AnyPtr, TypePtr::BotPTR, OffsetBot );
280
281 TypeRawPtr::BOTTOM = TypeRawPtr::make( TypePtr::BotPTR );
282 TypeRawPtr::NOTNULL= TypeRawPtr::make( TypePtr::NotNull );
283
284 const Type **fmembar = TypeTuple::fields(0);
285 TypeTuple::MEMBAR = TypeTuple::make(TypeFunc::Parms+0, fmembar);
286
287 const Type **fsc = (const Type**)shared_type_arena->Amalloc_4(2*sizeof(Type*));
288 fsc[0] = TypeInt::CC;
289 fsc[1] = Type::MEMORY;
290 TypeTuple::STORECONDITIONAL = TypeTuple::make(2, fsc);
291
292 TypeInstPtr::NOTNULL = TypeInstPtr::make(TypePtr::NotNull, current->env()->Object_klass());
293 TypeInstPtr::BOTTOM = TypeInstPtr::make(TypePtr::BotPTR, current->env()->Object_klass());
294 TypeInstPtr::MIRROR = TypeInstPtr::make(TypePtr::NotNull, current->env()->Class_klass());
295 TypeInstPtr::MARK = TypeInstPtr::make(TypePtr::BotPTR, current->env()->Object_klass(),
296 false, 0, oopDesc::mark_offset_in_bytes());
297 TypeInstPtr::KLASS = TypeInstPtr::make(TypePtr::BotPTR, current->env()->Object_klass(),
298 false, 0, oopDesc::klass_offset_in_bytes());
299 TypeOopPtr::BOTTOM = TypeOopPtr::make(TypePtr::BotPTR, OffsetBot, TypeOopPtr::InstanceBot);
300
301 TypeNarrowOop::NULL_PTR = TypeNarrowOop::make( TypePtr::NULL_PTR );
302 TypeNarrowOop::BOTTOM = TypeNarrowOop::make( TypeInstPtr::BOTTOM );
303
304 mreg2type[Op_Node] = Type::BOTTOM;
305 mreg2type[Op_Set ] = 0;
306 mreg2type[Op_RegN] = TypeNarrowOop::BOTTOM;
307 mreg2type[Op_RegI] = TypeInt::INT;
308 mreg2type[Op_RegP] = TypePtr::BOTTOM;
309 mreg2type[Op_RegF] = Type::FLOAT;
310 mreg2type[Op_RegD] = Type::DOUBLE;
311 mreg2type[Op_RegL] = TypeLong::LONG;
312 mreg2type[Op_RegFlags] = TypeInt::CC;
313
314 TypeAryPtr::RANGE = TypeAryPtr::make( TypePtr::BotPTR, TypeAry::make(Type::BOTTOM,TypeInt::POS), current->env()->Object_klass(), false, arrayOopDesc::length_offset_in_bytes());
315
316 TypeAryPtr::NARROWOOPS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeNarrowOop::BOTTOM, TypeInt::POS), NULL /*ciArrayKlass::make(o)*/, false, Type::OffsetBot);
317
318 #ifdef _LP64
319 if (UseCompressedOops) {
320 TypeAryPtr::OOPS = TypeAryPtr::NARROWOOPS;
321 } else
322 #endif
323 {
324 // There is no shared klass for Object[]. See note in TypeAryPtr::klass().
325 TypeAryPtr::OOPS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInstPtr::BOTTOM,TypeInt::POS), NULL /*ciArrayKlass::make(o)*/, false, Type::OffsetBot);
326 }
327 TypeAryPtr::BYTES = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInt::BYTE ,TypeInt::POS), ciTypeArrayKlass::make(T_BYTE), true, Type::OffsetBot);
328 TypeAryPtr::SHORTS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInt::SHORT ,TypeInt::POS), ciTypeArrayKlass::make(T_SHORT), true, Type::OffsetBot);
329 TypeAryPtr::CHARS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInt::CHAR ,TypeInt::POS), ciTypeArrayKlass::make(T_CHAR), true, Type::OffsetBot);
330 TypeAryPtr::INTS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeInt::INT ,TypeInt::POS), ciTypeArrayKlass::make(T_INT), true, Type::OffsetBot);
331 TypeAryPtr::LONGS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(TypeLong::LONG ,TypeInt::POS), ciTypeArrayKlass::make(T_LONG), true, Type::OffsetBot);
332 TypeAryPtr::FLOATS = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(Type::FLOAT ,TypeInt::POS), ciTypeArrayKlass::make(T_FLOAT), true, Type::OffsetBot);
333 TypeAryPtr::DOUBLES = TypeAryPtr::make(TypePtr::BotPTR, TypeAry::make(Type::DOUBLE ,TypeInt::POS), ciTypeArrayKlass::make(T_DOUBLE), true, Type::OffsetBot);
334
335 // Nobody should ask _array_body_type[T_NARROWOOP]. Use NULL as assert.
336 TypeAryPtr::_array_body_type[T_NARROWOOP] = NULL;
337 TypeAryPtr::_array_body_type[T_OBJECT] = TypeAryPtr::OOPS;
338 TypeAryPtr::_array_body_type[T_ARRAY] = TypeAryPtr::OOPS; // arrays are stored in oop arrays
339 TypeAryPtr::_array_body_type[T_BYTE] = TypeAryPtr::BYTES;
340 TypeAryPtr::_array_body_type[T_BOOLEAN] = TypeAryPtr::BYTES; // boolean[] is a byte array
341 TypeAryPtr::_array_body_type[T_SHORT] = TypeAryPtr::SHORTS;
342 TypeAryPtr::_array_body_type[T_CHAR] = TypeAryPtr::CHARS;
343 TypeAryPtr::_array_body_type[T_INT] = TypeAryPtr::INTS;
344 TypeAryPtr::_array_body_type[T_LONG] = TypeAryPtr::LONGS;
345 TypeAryPtr::_array_body_type[T_FLOAT] = TypeAryPtr::FLOATS;
346 TypeAryPtr::_array_body_type[T_DOUBLE] = TypeAryPtr::DOUBLES;
347
348 TypeKlassPtr::OBJECT = TypeKlassPtr::make( TypePtr::NotNull, current->env()->Object_klass(), 0 );
349 TypeKlassPtr::OBJECT_OR_NULL = TypeKlassPtr::make( TypePtr::BotPTR, current->env()->Object_klass(), 0 );
350
351 const Type **fi2c = TypeTuple::fields(2);
352 fi2c[TypeFunc::Parms+0] = TypeInstPtr::BOTTOM; // methodOop
353 fi2c[TypeFunc::Parms+1] = TypeRawPtr::BOTTOM; // argument pointer
354 TypeTuple::START_I2C = TypeTuple::make(TypeFunc::Parms+2, fi2c);
355
356 const Type **intpair = TypeTuple::fields(2);
357 intpair[0] = TypeInt::INT;
358 intpair[1] = TypeInt::INT;
359 TypeTuple::INT_PAIR = TypeTuple::make(2, intpair);
360
361 const Type **longpair = TypeTuple::fields(2);
362 longpair[0] = TypeLong::LONG;
363 longpair[1] = TypeLong::LONG;
364 TypeTuple::LONG_PAIR = TypeTuple::make(2, longpair);
365
366 _const_basic_type[T_NARROWOOP] = TypeNarrowOop::BOTTOM;
367 _const_basic_type[T_BOOLEAN] = TypeInt::BOOL;
368 _const_basic_type[T_CHAR] = TypeInt::CHAR;
369 _const_basic_type[T_BYTE] = TypeInt::BYTE;
370 _const_basic_type[T_SHORT] = TypeInt::SHORT;
371 _const_basic_type[T_INT] = TypeInt::INT;
372 _const_basic_type[T_LONG] = TypeLong::LONG;
373 _const_basic_type[T_FLOAT] = Type::FLOAT;
374 _const_basic_type[T_DOUBLE] = Type::DOUBLE;
375 _const_basic_type[T_OBJECT] = TypeInstPtr::BOTTOM;
376 _const_basic_type[T_ARRAY] = TypeInstPtr::BOTTOM; // there is no separate bottom for arrays
377 _const_basic_type[T_VOID] = TypePtr::NULL_PTR; // reflection represents void this way
378 _const_basic_type[T_ADDRESS] = TypeRawPtr::BOTTOM; // both interpreter return addresses & random raw ptrs
379 _const_basic_type[T_CONFLICT]= Type::BOTTOM; // why not?
380
381 _zero_type[T_NARROWOOP] = TypeNarrowOop::NULL_PTR;
382 _zero_type[T_BOOLEAN] = TypeInt::ZERO; // false == 0
383 _zero_type[T_CHAR] = TypeInt::ZERO; // '\0' == 0
384 _zero_type[T_BYTE] = TypeInt::ZERO; // 0x00 == 0
385 _zero_type[T_SHORT] = TypeInt::ZERO; // 0x0000 == 0
386 _zero_type[T_INT] = TypeInt::ZERO;
387 _zero_type[T_LONG] = TypeLong::ZERO;
388 _zero_type[T_FLOAT] = TypeF::ZERO;
389 _zero_type[T_DOUBLE] = TypeD::ZERO;
390 _zero_type[T_OBJECT] = TypePtr::NULL_PTR;
391 _zero_type[T_ARRAY] = TypePtr::NULL_PTR; // null array is null oop
392 _zero_type[T_ADDRESS] = TypePtr::NULL_PTR; // raw pointers use the same null
393 _zero_type[T_VOID] = Type::TOP; // the only void value is no value at all
394
395 // get_zero_type() should not happen for T_CONFLICT
396 _zero_type[T_CONFLICT]= NULL;
397
398 // Restore working type arena.
399 current->set_type_arena(save);
400 current->set_type_dict(NULL);
401 }
402
403 //------------------------------Initialize-------------------------------------
404 void Type::Initialize(Compile* current) {
405 assert(current->type_arena() != NULL, "must have created type arena");
406
407 if (_shared_type_dict == NULL) {
408 Initialize_shared(current);
409 }
410
411 Arena* type_arena = current->type_arena();
412
413 // Create the hash-cons'ing dictionary with top-level storage allocation
414 Dict *tdic = new (type_arena) Dict( (CmpKey)Type::cmp,(Hash)Type::uhash, type_arena, 128 );
415 current->set_type_dict(tdic);
416
417 // Transfer the shared types.
418 DictI i(_shared_type_dict);
419 for( ; i.test(); ++i ) {
420 Type* t = (Type*)i._value;
421 tdic->Insert(t,t); // New Type, insert into Type table
422 }
423
424 #ifdef ASSERT
425 verify_lastype();
426 #endif
427 }
428
429 //------------------------------hashcons---------------------------------------
430 // Do the hash-cons trick. If the Type already exists in the type table,
431 // delete the current Type and return the existing Type. Otherwise stick the
432 // current Type in the Type table.
433 const Type *Type::hashcons(void) {
434 debug_only(base()); // Check the assertion in Type::base().
435 // Look up the Type in the Type dictionary
436 Dict *tdic = type_dict();
437 Type* old = (Type*)(tdic->Insert(this, this, false));
438 if( old ) { // Pre-existing Type?
439 if( old != this ) // Yes, this guy is not the pre-existing?
440 delete this; // Yes, Nuke this guy
441 assert( old->_dual, "" );
442 return old; // Return pre-existing
443 }
444
445 // Every type has a dual (to make my lattice symmetric).
446 // Since we just discovered a new Type, compute its dual right now.
447 assert( !_dual, "" ); // No dual yet
448 _dual = xdual(); // Compute the dual
449 if( cmp(this,_dual)==0 ) { // Handle self-symmetric
450 _dual = this;
451 return this;
452 }
453 assert( !_dual->_dual, "" ); // No reverse dual yet
454 assert( !(*tdic)[_dual], "" ); // Dual not in type system either
455 // New Type, insert into Type table
456 tdic->Insert((void*)_dual,(void*)_dual);
457 ((Type*)_dual)->_dual = this; // Finish up being symmetric
458 #ifdef ASSERT
459 Type *dual_dual = (Type*)_dual->xdual();
460 assert( eq(dual_dual), "xdual(xdual()) should be identity" );
461 delete dual_dual;
462 #endif
463 return this; // Return new Type
464 }
465
466 //------------------------------eq---------------------------------------------
467 // Structural equality check for Type representations
468 bool Type::eq( const Type * ) const {
469 return true; // Nothing else can go wrong
470 }
471
472 //------------------------------hash-------------------------------------------
473 // Type-specific hashing function.
474 int Type::hash(void) const {
475 return _base;
476 }
477
478 //------------------------------is_finite--------------------------------------
479 // Has a finite value
480 bool Type::is_finite() const {
481 return false;
482 }
483
484 //------------------------------is_nan-----------------------------------------
485 // Is not a number (NaN)
486 bool Type::is_nan() const {
487 return false;
488 }
489
490 //----------------------interface_vs_oop---------------------------------------
491 #ifdef ASSERT
492 bool Type::interface_vs_oop(const Type *t) const {
493 bool result = false;
494
495 const TypePtr* this_ptr = this->make_ptr(); // In case it is narrow_oop
496 const TypePtr* t_ptr = t->make_ptr();
497 if( this_ptr == NULL || t_ptr == NULL )
498 return result;
499
500 const TypeInstPtr* this_inst = this_ptr->isa_instptr();
501 const TypeInstPtr* t_inst = t_ptr->isa_instptr();
502 if( this_inst && this_inst->is_loaded() && t_inst && t_inst->is_loaded() ) {
503 bool this_interface = this_inst->klass()->is_interface();
504 bool t_interface = t_inst->klass()->is_interface();
505 result = this_interface ^ t_interface;
506 }
507
508 return result;
509 }
510 #endif
511
512 //------------------------------meet-------------------------------------------
513 // Compute the MEET of two types. NOT virtual. It enforces that meet is
514 // commutative and the lattice is symmetric.
515 const Type *Type::meet( const Type *t ) const {
516 if (isa_narrowoop() && t->isa_narrowoop()) {
517 const Type* result = make_ptr()->meet(t->make_ptr());
518 return result->make_narrowoop();
519 }
520
521 const Type *mt = xmeet(t);
522 if (isa_narrowoop() || t->isa_narrowoop()) return mt;
523 #ifdef ASSERT
524 assert( mt == t->xmeet(this), "meet not commutative" );
525 const Type* dual_join = mt->_dual;
526 const Type *t2t = dual_join->xmeet(t->_dual);
527 const Type *t2this = dual_join->xmeet( _dual);
528
529 // Interface meet Oop is Not Symmetric:
530 // Interface:AnyNull meet Oop:AnyNull == Interface:AnyNull
531 // Interface:NotNull meet Oop:NotNull == java/lang/Object:NotNull
532
533 if( !interface_vs_oop(t) && (t2t != t->_dual || t2this != _dual) ) {
534 tty->print_cr("=== Meet Not Symmetric ===");
535 tty->print("t = "); t->dump(); tty->cr();
536 tty->print("this= "); dump(); tty->cr();
537 tty->print("mt=(t meet this)= "); mt->dump(); tty->cr();
538
539 tty->print("t_dual= "); t->_dual->dump(); tty->cr();
540 tty->print("this_dual= "); _dual->dump(); tty->cr();
541 tty->print("mt_dual= "); mt->_dual->dump(); tty->cr();
542
543 tty->print("mt_dual meet t_dual= "); t2t ->dump(); tty->cr();
544 tty->print("mt_dual meet this_dual= "); t2this ->dump(); tty->cr();
545
546 fatal("meet not symmetric" );
547 }
548 #endif
549 return mt;
550 }
551
552 //------------------------------xmeet------------------------------------------
553 // Compute the MEET of two types. It returns a new Type object.
554 const Type *Type::xmeet( const Type *t ) const {
555 // Perform a fast test for common case; meeting the same types together.
556 if( this == t ) return this; // Meeting same type-rep?
557
558 // Meeting TOP with anything?
559 if( _base == Top ) return t;
560
561 // Meeting BOTTOM with anything?
562 if( _base == Bottom ) return BOTTOM;
563
564 // Current "this->_base" is one of: Bad, Multi, Control, Top,
565 // Abio, Abstore, Floatxxx, Doublexxx, Bottom, lastype.
566 switch (t->base()) { // Switch on original type
567
568 // Cut in half the number of cases I must handle. Only need cases for when
569 // the given enum "t->type" is less than or equal to the local enum "type".
570 case FloatCon:
571 case DoubleCon:
572 case Int:
573 case Long:
574 return t->xmeet(this);
575
576 case OopPtr:
577 return t->xmeet(this);
578
579 case InstPtr:
580 return t->xmeet(this);
581
582 case KlassPtr:
583 return t->xmeet(this);
584
585 case AryPtr:
586 return t->xmeet(this);
587
588 case NarrowOop:
589 return t->xmeet(this);
590
591 case Bad: // Type check
592 default: // Bogus type not in lattice
593 typerr(t);
594 return Type::BOTTOM;
595
596 case Bottom: // Ye Olde Default
597 return t;
598
599 case FloatTop:
600 if( _base == FloatTop ) return this;
601 case FloatBot: // Float
602 if( _base == FloatBot || _base == FloatTop ) return FLOAT;
603 if( _base == DoubleTop || _base == DoubleBot ) return Type::BOTTOM;
604 typerr(t);
605 return Type::BOTTOM;
606
607 case DoubleTop:
608 if( _base == DoubleTop ) return this;
609 case DoubleBot: // Double
610 if( _base == DoubleBot || _base == DoubleTop ) return DOUBLE;
611 if( _base == FloatTop || _base == FloatBot ) return Type::BOTTOM;
612 typerr(t);
613 return Type::BOTTOM;
614
615 // These next few cases must match exactly or it is a compile-time error.
616 case Control: // Control of code
617 case Abio: // State of world outside of program
618 case Memory:
619 if( _base == t->_base ) return this;
620 typerr(t);
621 return Type::BOTTOM;
622
623 case Top: // Top of the lattice
624 return this;
625 }
626
627 // The type is unchanged
628 return this;
629 }
630
631 //-----------------------------filter------------------------------------------
632 const Type *Type::filter( const Type *kills ) const {
633 const Type* ft = join(kills);
634 if (ft->empty())
635 return Type::TOP; // Canonical empty value
636 return ft;
637 }
638
639 //------------------------------xdual------------------------------------------
640 // Compute dual right now.
641 const Type::TYPES Type::dual_type[Type::lastype] = {
642 Bad, // Bad
643 Control, // Control
644 Bottom, // Top
645 Bad, // Int - handled in v-call
646 Bad, // Long - handled in v-call
647 Half, // Half
648 Bad, // NarrowOop - handled in v-call
649
650 Bad, // Tuple - handled in v-call
651 Bad, // Array - handled in v-call
652
653 Bad, // AnyPtr - handled in v-call
654 Bad, // RawPtr - handled in v-call
655 Bad, // OopPtr - handled in v-call
656 Bad, // InstPtr - handled in v-call
657 Bad, // AryPtr - handled in v-call
658 Bad, // KlassPtr - handled in v-call
659
660 Bad, // Function - handled in v-call
661 Abio, // Abio
662 Return_Address,// Return_Address
663 Memory, // Memory
664 FloatBot, // FloatTop
665 FloatCon, // FloatCon
666 FloatTop, // FloatBot
667 DoubleBot, // DoubleTop
668 DoubleCon, // DoubleCon
669 DoubleTop, // DoubleBot
670 Top // Bottom
671 };
672
673 const Type *Type::xdual() const {
674 // Note: the base() accessor asserts the sanity of _base.
675 assert(dual_type[base()] != Bad, "implement with v-call");
676 return new Type(dual_type[_base]);
677 }
678
679 //------------------------------has_memory-------------------------------------
680 bool Type::has_memory() const {
681 Type::TYPES tx = base();
682 if (tx == Memory) return true;
683 if (tx == Tuple) {
684 const TypeTuple *t = is_tuple();
685 for (uint i=0; i < t->cnt(); i++) {
686 tx = t->field_at(i)->base();
687 if (tx == Memory) return true;
688 }
689 }
690 return false;
691 }
692
693 #ifndef PRODUCT
694 //------------------------------dump2------------------------------------------
695 void Type::dump2( Dict &d, uint depth, outputStream *st ) const {
696 st->print(msg[_base]);
697 }
698
699 //------------------------------dump-------------------------------------------
700 void Type::dump_on(outputStream *st) const {
701 ResourceMark rm;
702 Dict d(cmpkey,hashkey); // Stop recursive type dumping
703 dump2(d,1, st);
704 if (is_ptr_to_narrowoop()) {
705 st->print(" [narrow]");
706 }
707 }
708
709 //------------------------------data-------------------------------------------
710 const char * const Type::msg[Type::lastype] = {
711 "bad","control","top","int:","long:","half", "narrowoop:",
712 "tuple:", "aryptr",
713 "anyptr:", "rawptr:", "java:", "inst:", "ary:", "klass:",
714 "func", "abIO", "return_address", "memory",
715 "float_top", "ftcon:", "float",
716 "double_top", "dblcon:", "double",
717 "bottom"
718 };
719 #endif
720
721 //------------------------------singleton--------------------------------------
722 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
723 // constants (Ldi nodes). Singletons are integer, float or double constants.
724 bool Type::singleton(void) const {
725 return _base == Top || _base == Half;
726 }
727
728 //------------------------------empty------------------------------------------
729 // TRUE if Type is a type with no values, FALSE otherwise.
730 bool Type::empty(void) const {
731 switch (_base) {
732 case DoubleTop:
733 case FloatTop:
734 case Top:
735 return true;
736
737 case Half:
738 case Abio:
739 case Return_Address:
740 case Memory:
741 case Bottom:
742 case FloatBot:
743 case DoubleBot:
744 return false; // never a singleton, therefore never empty
745 }
746
747 ShouldNotReachHere();
748 return false;
749 }
750
751 //------------------------------dump_stats-------------------------------------
752 // Dump collected statistics to stderr
753 #ifndef PRODUCT
754 void Type::dump_stats() {
755 tty->print("Types made: %d\n", type_dict()->Size());
756 }
757 #endif
758
759 //------------------------------typerr-----------------------------------------
760 void Type::typerr( const Type *t ) const {
761 #ifndef PRODUCT
762 tty->print("\nError mixing types: ");
763 dump();
764 tty->print(" and ");
765 t->dump();
766 tty->print("\n");
767 #endif
768 ShouldNotReachHere();
769 }
770
771 //------------------------------isa_oop_ptr------------------------------------
772 // Return true if type is an oop pointer type. False for raw pointers.
773 static char isa_oop_ptr_tbl[Type::lastype] = {
774 0,0,0,0,0,0,0/*narrowoop*/,0/*tuple*/, 0/*ary*/,
775 0/*anyptr*/,0/*rawptr*/,1/*OopPtr*/,1/*InstPtr*/,1/*AryPtr*/,1/*KlassPtr*/,
776 0/*func*/,0,0/*return_address*/,0,
777 /*floats*/0,0,0, /*doubles*/0,0,0,
778 0
779 };
780 bool Type::isa_oop_ptr() const {
781 return isa_oop_ptr_tbl[_base] != 0;
782 }
783
784 //------------------------------dump_stats-------------------------------------
785 // // Check that arrays match type enum
786 #ifndef PRODUCT
787 void Type::verify_lastype() {
788 // Check that arrays match enumeration
789 assert( Type::dual_type [Type::lastype - 1] == Type::Top, "did not update array");
790 assert( strcmp(Type::msg [Type::lastype - 1],"bottom") == 0, "did not update array");
791 // assert( PhiNode::tbl [Type::lastype - 1] == NULL, "did not update array");
792 assert( Matcher::base2reg[Type::lastype - 1] == 0, "did not update array");
793 assert( isa_oop_ptr_tbl [Type::lastype - 1] == (char)0, "did not update array");
794 }
795 #endif
796
797 //=============================================================================
798 // Convenience common pre-built types.
799 const TypeF *TypeF::ZERO; // Floating point zero
800 const TypeF *TypeF::ONE; // Floating point one
801
802 //------------------------------make-------------------------------------------
803 // Create a float constant
804 const TypeF *TypeF::make(float f) {
805 return (TypeF*)(new TypeF(f))->hashcons();
806 }
807
808 //------------------------------meet-------------------------------------------
809 // Compute the MEET of two types. It returns a new Type object.
810 const Type *TypeF::xmeet( const Type *t ) const {
811 // Perform a fast test for common case; meeting the same types together.
812 if( this == t ) return this; // Meeting same type-rep?
813
814 // Current "this->_base" is FloatCon
815 switch (t->base()) { // Switch on original type
816 case AnyPtr: // Mixing with oops happens when javac
817 case RawPtr: // reuses local variables
818 case OopPtr:
819 case InstPtr:
820 case KlassPtr:
821 case AryPtr:
822 case NarrowOop:
823 case Int:
824 case Long:
825 case DoubleTop:
826 case DoubleCon:
827 case DoubleBot:
828 case Bottom: // Ye Olde Default
829 return Type::BOTTOM;
830
831 case FloatBot:
832 return t;
833
834 default: // All else is a mistake
835 typerr(t);
836
837 case FloatCon: // Float-constant vs Float-constant?
838 if( jint_cast(_f) != jint_cast(t->getf()) ) // unequal constants?
839 // must compare bitwise as positive zero, negative zero and NaN have
840 // all the same representation in C++
841 return FLOAT; // Return generic float
842 // Equal constants
843 case Top:
844 case FloatTop:
845 break; // Return the float constant
846 }
847 return this; // Return the float constant
848 }
849
850 //------------------------------xdual------------------------------------------
851 // Dual: symmetric
852 const Type *TypeF::xdual() const {
853 return this;
854 }
855
856 //------------------------------eq---------------------------------------------
857 // Structural equality check for Type representations
858 bool TypeF::eq( const Type *t ) const {
859 if( g_isnan(_f) ||
860 g_isnan(t->getf()) ) {
861 // One or both are NANs. If both are NANs return true, else false.
862 return (g_isnan(_f) && g_isnan(t->getf()));
863 }
864 if (_f == t->getf()) {
865 // (NaN is impossible at this point, since it is not equal even to itself)
866 if (_f == 0.0) {
867 // difference between positive and negative zero
868 if (jint_cast(_f) != jint_cast(t->getf())) return false;
869 }
870 return true;
871 }
872 return false;
873 }
874
875 //------------------------------hash-------------------------------------------
876 // Type-specific hashing function.
877 int TypeF::hash(void) const {
878 return *(int*)(&_f);
879 }
880
881 //------------------------------is_finite--------------------------------------
882 // Has a finite value
883 bool TypeF::is_finite() const {
884 return g_isfinite(getf()) != 0;
885 }
886
887 //------------------------------is_nan-----------------------------------------
888 // Is not a number (NaN)
889 bool TypeF::is_nan() const {
890 return g_isnan(getf()) != 0;
891 }
892
893 //------------------------------dump2------------------------------------------
894 // Dump float constant Type
895 #ifndef PRODUCT
896 void TypeF::dump2( Dict &d, uint depth, outputStream *st ) const {
897 Type::dump2(d,depth, st);
898 st->print("%f", _f);
899 }
900 #endif
901
902 //------------------------------singleton--------------------------------------
903 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
904 // constants (Ldi nodes). Singletons are integer, float or double constants
905 // or a single symbol.
906 bool TypeF::singleton(void) const {
907 return true; // Always a singleton
908 }
909
910 bool TypeF::empty(void) const {
911 return false; // always exactly a singleton
912 }
913
914 //=============================================================================
915 // Convenience common pre-built types.
916 const TypeD *TypeD::ZERO; // Floating point zero
917 const TypeD *TypeD::ONE; // Floating point one
918
919 //------------------------------make-------------------------------------------
920 const TypeD *TypeD::make(double d) {
921 return (TypeD*)(new TypeD(d))->hashcons();
922 }
923
924 //------------------------------meet-------------------------------------------
925 // Compute the MEET of two types. It returns a new Type object.
926 const Type *TypeD::xmeet( const Type *t ) const {
927 // Perform a fast test for common case; meeting the same types together.
928 if( this == t ) return this; // Meeting same type-rep?
929
930 // Current "this->_base" is DoubleCon
931 switch (t->base()) { // Switch on original type
932 case AnyPtr: // Mixing with oops happens when javac
933 case RawPtr: // reuses local variables
934 case OopPtr:
935 case InstPtr:
936 case KlassPtr:
937 case AryPtr:
938 case NarrowOop:
939 case Int:
940 case Long:
941 case FloatTop:
942 case FloatCon:
943 case FloatBot:
944 case Bottom: // Ye Olde Default
945 return Type::BOTTOM;
946
947 case DoubleBot:
948 return t;
949
950 default: // All else is a mistake
951 typerr(t);
952
953 case DoubleCon: // Double-constant vs Double-constant?
954 if( jlong_cast(_d) != jlong_cast(t->getd()) ) // unequal constants? (see comment in TypeF::xmeet)
955 return DOUBLE; // Return generic double
956 case Top:
957 case DoubleTop:
958 break;
959 }
960 return this; // Return the double constant
961 }
962
963 //------------------------------xdual------------------------------------------
964 // Dual: symmetric
965 const Type *TypeD::xdual() const {
966 return this;
967 }
968
969 //------------------------------eq---------------------------------------------
970 // Structural equality check for Type representations
971 bool TypeD::eq( const Type *t ) const {
972 if( g_isnan(_d) ||
973 g_isnan(t->getd()) ) {
974 // One or both are NANs. If both are NANs return true, else false.
975 return (g_isnan(_d) && g_isnan(t->getd()));
976 }
977 if (_d == t->getd()) {
978 // (NaN is impossible at this point, since it is not equal even to itself)
979 if (_d == 0.0) {
980 // difference between positive and negative zero
981 if (jlong_cast(_d) != jlong_cast(t->getd())) return false;
982 }
983 return true;
984 }
985 return false;
986 }
987
988 //------------------------------hash-------------------------------------------
989 // Type-specific hashing function.
990 int TypeD::hash(void) const {
991 return *(int*)(&_d);
992 }
993
994 //------------------------------is_finite--------------------------------------
995 // Has a finite value
996 bool TypeD::is_finite() const {
997 return g_isfinite(getd()) != 0;
998 }
999
1000 //------------------------------is_nan-----------------------------------------
1001 // Is not a number (NaN)
1002 bool TypeD::is_nan() const {
1003 return g_isnan(getd()) != 0;
1004 }
1005
1006 //------------------------------dump2------------------------------------------
1007 // Dump double constant Type
1008 #ifndef PRODUCT
1009 void TypeD::dump2( Dict &d, uint depth, outputStream *st ) const {
1010 Type::dump2(d,depth,st);
1011 st->print("%f", _d);
1012 }
1013 #endif
1014
1015 //------------------------------singleton--------------------------------------
1016 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1017 // constants (Ldi nodes). Singletons are integer, float or double constants
1018 // or a single symbol.
1019 bool TypeD::singleton(void) const {
1020 return true; // Always a singleton
1021 }
1022
1023 bool TypeD::empty(void) const {
1024 return false; // always exactly a singleton
1025 }
1026
1027 //=============================================================================
1028 // Convience common pre-built types.
1029 const TypeInt *TypeInt::MINUS_1;// -1
1030 const TypeInt *TypeInt::ZERO; // 0
1031 const TypeInt *TypeInt::ONE; // 1
1032 const TypeInt *TypeInt::BOOL; // 0 or 1, FALSE or TRUE.
1033 const TypeInt *TypeInt::CC; // -1,0 or 1, condition codes
1034 const TypeInt *TypeInt::CC_LT; // [-1] == MINUS_1
1035 const TypeInt *TypeInt::CC_GT; // [1] == ONE
1036 const TypeInt *TypeInt::CC_EQ; // [0] == ZERO
1037 const TypeInt *TypeInt::CC_LE; // [-1,0]
1038 const TypeInt *TypeInt::CC_GE; // [0,1] == BOOL (!)
1039 const TypeInt *TypeInt::BYTE; // Bytes, -128 to 127
1040 const TypeInt *TypeInt::UBYTE; // Unsigned Bytes, 0 to 255
1041 const TypeInt *TypeInt::CHAR; // Java chars, 0-65535
1042 const TypeInt *TypeInt::SHORT; // Java shorts, -32768-32767
1043 const TypeInt *TypeInt::POS; // Positive 32-bit integers or zero
1044 const TypeInt *TypeInt::POS1; // Positive 32-bit integers
1045 const TypeInt *TypeInt::INT; // 32-bit integers
1046 const TypeInt *TypeInt::SYMINT; // symmetric range [-max_jint..max_jint]
1047
1048 //------------------------------TypeInt----------------------------------------
1049 TypeInt::TypeInt( jint lo, jint hi, int w ) : Type(Int), _lo(lo), _hi(hi), _widen(w) {
1050 }
1051
1052 //------------------------------make-------------------------------------------
1053 const TypeInt *TypeInt::make( jint lo ) {
1054 return (TypeInt*)(new TypeInt(lo,lo,WidenMin))->hashcons();
1055 }
1056
1057 #define SMALLINT ((juint)3) // a value too insignificant to consider widening
1058
1059 const TypeInt *TypeInt::make( jint lo, jint hi, int w ) {
1060 // Certain normalizations keep us sane when comparing types.
1061 // The 'SMALLINT' covers constants and also CC and its relatives.
1062 assert(CC == NULL || (juint)(CC->_hi - CC->_lo) <= SMALLINT, "CC is truly small");
1063 if (lo <= hi) {
1064 if ((juint)(hi - lo) <= SMALLINT) w = Type::WidenMin;
1065 if ((juint)(hi - lo) >= max_juint) w = Type::WidenMax; // plain int
1066 }
1067 return (TypeInt*)(new TypeInt(lo,hi,w))->hashcons();
1068 }
1069
1070 //------------------------------meet-------------------------------------------
1071 // Compute the MEET of two types. It returns a new Type representation object
1072 // with reference count equal to the number of Types pointing at it.
1073 // Caller should wrap a Types around it.
1074 const Type *TypeInt::xmeet( const Type *t ) const {
1075 // Perform a fast test for common case; meeting the same types together.
1076 if( this == t ) return this; // Meeting same type?
1077
1078 // Currently "this->_base" is a TypeInt
1079 switch (t->base()) { // Switch on original type
1080 case AnyPtr: // Mixing with oops happens when javac
1081 case RawPtr: // reuses local variables
1082 case OopPtr:
1083 case InstPtr:
1084 case KlassPtr:
1085 case AryPtr:
1086 case NarrowOop:
1087 case Long:
1088 case FloatTop:
1089 case FloatCon:
1090 case FloatBot:
1091 case DoubleTop:
1092 case DoubleCon:
1093 case DoubleBot:
1094 case Bottom: // Ye Olde Default
1095 return Type::BOTTOM;
1096 default: // All else is a mistake
1097 typerr(t);
1098 case Top: // No change
1099 return this;
1100 case Int: // Int vs Int?
1101 break;
1102 }
1103
1104 // Expand covered set
1105 const TypeInt *r = t->is_int();
1106 // (Avoid TypeInt::make, to avoid the argument normalizations it enforces.)
1107 return (new TypeInt( MIN2(_lo,r->_lo), MAX2(_hi,r->_hi), MAX2(_widen,r->_widen) ))->hashcons();
1108 }
1109
1110 //------------------------------xdual------------------------------------------
1111 // Dual: reverse hi & lo; flip widen
1112 const Type *TypeInt::xdual() const {
1113 return new TypeInt(_hi,_lo,WidenMax-_widen);
1114 }
1115
1116 //------------------------------widen------------------------------------------
1117 // Only happens for optimistic top-down optimizations.
1118 const Type *TypeInt::widen( const Type *old, const Type* limit ) const {
1119 // Coming from TOP or such; no widening
1120 if( old->base() != Int ) return this;
1121 const TypeInt *ot = old->is_int();
1122
1123 // If new guy is equal to old guy, no widening
1124 if( _lo == ot->_lo && _hi == ot->_hi )
1125 return old;
1126
1127 // If new guy contains old, then we widened
1128 if( _lo <= ot->_lo && _hi >= ot->_hi ) {
1129 // New contains old
1130 // If new guy is already wider than old, no widening
1131 if( _widen > ot->_widen ) return this;
1132 // If old guy was a constant, do not bother
1133 if (ot->_lo == ot->_hi) return this;
1134 // Now widen new guy.
1135 // Check for widening too far
1136 if (_widen == WidenMax) {
1137 int max = max_jint;
1138 int min = min_jint;
1139 if (limit->isa_int()) {
1140 max = limit->is_int()->_hi;
1141 min = limit->is_int()->_lo;
1142 }
1143 if (min < _lo && _hi < max) {
1144 // If neither endpoint is extremal yet, push out the endpoint
1145 // which is closer to its respective limit.
1146 if (_lo >= 0 || // easy common case
1147 (juint)(_lo - min) >= (juint)(max - _hi)) {
1148 // Try to widen to an unsigned range type of 31 bits:
1149 return make(_lo, max, WidenMax);
1150 } else {
1151 return make(min, _hi, WidenMax);
1152 }
1153 }
1154 return TypeInt::INT;
1155 }
1156 // Returned widened new guy
1157 return make(_lo,_hi,_widen+1);
1158 }
1159
1160 // If old guy contains new, then we probably widened too far & dropped to
1161 // bottom. Return the wider fellow.
1162 if ( ot->_lo <= _lo && ot->_hi >= _hi )
1163 return old;
1164
1165 //fatal("Integer value range is not subset");
1166 //return this;
1167 return TypeInt::INT;
1168 }
1169
1170 //------------------------------narrow---------------------------------------
1171 // Only happens for pessimistic optimizations.
1172 const Type *TypeInt::narrow( const Type *old ) const {
1173 if (_lo >= _hi) return this; // already narrow enough
1174 if (old == NULL) return this;
1175 const TypeInt* ot = old->isa_int();
1176 if (ot == NULL) return this;
1177 jint olo = ot->_lo;
1178 jint ohi = ot->_hi;
1179
1180 // If new guy is equal to old guy, no narrowing
1181 if (_lo == olo && _hi == ohi) return old;
1182
1183 // If old guy was maximum range, allow the narrowing
1184 if (olo == min_jint && ohi == max_jint) return this;
1185
1186 if (_lo < olo || _hi > ohi)
1187 return this; // doesn't narrow; pretty wierd
1188
1189 // The new type narrows the old type, so look for a "death march".
1190 // See comments on PhaseTransform::saturate.
1191 juint nrange = _hi - _lo;
1192 juint orange = ohi - olo;
1193 if (nrange < max_juint - 1 && nrange > (orange >> 1) + (SMALLINT*2)) {
1194 // Use the new type only if the range shrinks a lot.
1195 // We do not want the optimizer computing 2^31 point by point.
1196 return old;
1197 }
1198
1199 return this;
1200 }
1201
1202 //-----------------------------filter------------------------------------------
1203 const Type *TypeInt::filter( const Type *kills ) const {
1204 const TypeInt* ft = join(kills)->isa_int();
1205 if (ft == NULL || ft->_lo > ft->_hi)
1206 return Type::TOP; // Canonical empty value
1207 if (ft->_widen < this->_widen) {
1208 // Do not allow the value of kill->_widen to affect the outcome.
1209 // The widen bits must be allowed to run freely through the graph.
1210 ft = TypeInt::make(ft->_lo, ft->_hi, this->_widen);
1211 }
1212 return ft;
1213 }
1214
1215 //------------------------------eq---------------------------------------------
1216 // Structural equality check for Type representations
1217 bool TypeInt::eq( const Type *t ) const {
1218 const TypeInt *r = t->is_int(); // Handy access
1219 return r->_lo == _lo && r->_hi == _hi && r->_widen == _widen;
1220 }
1221
1222 //------------------------------hash-------------------------------------------
1223 // Type-specific hashing function.
1224 int TypeInt::hash(void) const {
1225 return _lo+_hi+_widen+(int)Type::Int;
1226 }
1227
1228 //------------------------------is_finite--------------------------------------
1229 // Has a finite value
1230 bool TypeInt::is_finite() const {
1231 return true;
1232 }
1233
1234 //------------------------------dump2------------------------------------------
1235 // Dump TypeInt
1236 #ifndef PRODUCT
1237 static const char* intname(char* buf, jint n) {
1238 if (n == min_jint)
1239 return "min";
1240 else if (n < min_jint + 10000)
1241 sprintf(buf, "min+" INT32_FORMAT, n - min_jint);
1242 else if (n == max_jint)
1243 return "max";
1244 else if (n > max_jint - 10000)
1245 sprintf(buf, "max-" INT32_FORMAT, max_jint - n);
1246 else
1247 sprintf(buf, INT32_FORMAT, n);
1248 return buf;
1249 }
1250
1251 void TypeInt::dump2( Dict &d, uint depth, outputStream *st ) const {
1252 char buf[40], buf2[40];
1253 if (_lo == min_jint && _hi == max_jint)
1254 st->print("int");
1255 else if (is_con())
1256 st->print("int:%s", intname(buf, get_con()));
1257 else if (_lo == BOOL->_lo && _hi == BOOL->_hi)
1258 st->print("bool");
1259 else if (_lo == BYTE->_lo && _hi == BYTE->_hi)
1260 st->print("byte");
1261 else if (_lo == CHAR->_lo && _hi == CHAR->_hi)
1262 st->print("char");
1263 else if (_lo == SHORT->_lo && _hi == SHORT->_hi)
1264 st->print("short");
1265 else if (_hi == max_jint)
1266 st->print("int:>=%s", intname(buf, _lo));
1267 else if (_lo == min_jint)
1268 st->print("int:<=%s", intname(buf, _hi));
1269 else
1270 st->print("int:%s..%s", intname(buf, _lo), intname(buf2, _hi));
1271
1272 if (_widen != 0 && this != TypeInt::INT)
1273 st->print(":%.*s", _widen, "wwww");
1274 }
1275 #endif
1276
1277 //------------------------------singleton--------------------------------------
1278 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1279 // constants.
1280 bool TypeInt::singleton(void) const {
1281 return _lo >= _hi;
1282 }
1283
1284 bool TypeInt::empty(void) const {
1285 return _lo > _hi;
1286 }
1287
1288 //=============================================================================
1289 // Convenience common pre-built types.
1290 const TypeLong *TypeLong::MINUS_1;// -1
1291 const TypeLong *TypeLong::ZERO; // 0
1292 const TypeLong *TypeLong::ONE; // 1
1293 const TypeLong *TypeLong::POS; // >=0
1294 const TypeLong *TypeLong::LONG; // 64-bit integers
1295 const TypeLong *TypeLong::INT; // 32-bit subrange
1296 const TypeLong *TypeLong::UINT; // 32-bit unsigned subrange
1297
1298 //------------------------------TypeLong---------------------------------------
1299 TypeLong::TypeLong( jlong lo, jlong hi, int w ) : Type(Long), _lo(lo), _hi(hi), _widen(w) {
1300 }
1301
1302 //------------------------------make-------------------------------------------
1303 const TypeLong *TypeLong::make( jlong lo ) {
1304 return (TypeLong*)(new TypeLong(lo,lo,WidenMin))->hashcons();
1305 }
1306
1307 const TypeLong *TypeLong::make( jlong lo, jlong hi, int w ) {
1308 // Certain normalizations keep us sane when comparing types.
1309 // The '1' covers constants.
1310 if (lo <= hi) {
1311 if ((julong)(hi - lo) <= SMALLINT) w = Type::WidenMin;
1312 if ((julong)(hi - lo) >= max_julong) w = Type::WidenMax; // plain long
1313 }
1314 return (TypeLong*)(new TypeLong(lo,hi,w))->hashcons();
1315 }
1316
1317
1318 //------------------------------meet-------------------------------------------
1319 // Compute the MEET of two types. It returns a new Type representation object
1320 // with reference count equal to the number of Types pointing at it.
1321 // Caller should wrap a Types around it.
1322 const Type *TypeLong::xmeet( const Type *t ) const {
1323 // Perform a fast test for common case; meeting the same types together.
1324 if( this == t ) return this; // Meeting same type?
1325
1326 // Currently "this->_base" is a TypeLong
1327 switch (t->base()) { // Switch on original type
1328 case AnyPtr: // Mixing with oops happens when javac
1329 case RawPtr: // reuses local variables
1330 case OopPtr:
1331 case InstPtr:
1332 case KlassPtr:
1333 case AryPtr:
1334 case NarrowOop:
1335 case Int:
1336 case FloatTop:
1337 case FloatCon:
1338 case FloatBot:
1339 case DoubleTop:
1340 case DoubleCon:
1341 case DoubleBot:
1342 case Bottom: // Ye Olde Default
1343 return Type::BOTTOM;
1344 default: // All else is a mistake
1345 typerr(t);
1346 case Top: // No change
1347 return this;
1348 case Long: // Long vs Long?
1349 break;
1350 }
1351
1352 // Expand covered set
1353 const TypeLong *r = t->is_long(); // Turn into a TypeLong
1354 // (Avoid TypeLong::make, to avoid the argument normalizations it enforces.)
1355 return (new TypeLong( MIN2(_lo,r->_lo), MAX2(_hi,r->_hi), MAX2(_widen,r->_widen) ))->hashcons();
1356 }
1357
1358 //------------------------------xdual------------------------------------------
1359 // Dual: reverse hi & lo; flip widen
1360 const Type *TypeLong::xdual() const {
1361 return new TypeLong(_hi,_lo,WidenMax-_widen);
1362 }
1363
1364 //------------------------------widen------------------------------------------
1365 // Only happens for optimistic top-down optimizations.
1366 const Type *TypeLong::widen( const Type *old, const Type* limit ) const {
1367 // Coming from TOP or such; no widening
1368 if( old->base() != Long ) return this;
1369 const TypeLong *ot = old->is_long();
1370
1371 // If new guy is equal to old guy, no widening
1372 if( _lo == ot->_lo && _hi == ot->_hi )
1373 return old;
1374
1375 // If new guy contains old, then we widened
1376 if( _lo <= ot->_lo && _hi >= ot->_hi ) {
1377 // New contains old
1378 // If new guy is already wider than old, no widening
1379 if( _widen > ot->_widen ) return this;
1380 // If old guy was a constant, do not bother
1381 if (ot->_lo == ot->_hi) return this;
1382 // Now widen new guy.
1383 // Check for widening too far
1384 if (_widen == WidenMax) {
1385 jlong max = max_jlong;
1386 jlong min = min_jlong;
1387 if (limit->isa_long()) {
1388 max = limit->is_long()->_hi;
1389 min = limit->is_long()->_lo;
1390 }
1391 if (min < _lo && _hi < max) {
1392 // If neither endpoint is extremal yet, push out the endpoint
1393 // which is closer to its respective limit.
1394 if (_lo >= 0 || // easy common case
1395 (julong)(_lo - min) >= (julong)(max - _hi)) {
1396 // Try to widen to an unsigned range type of 32/63 bits:
1397 if (max >= max_juint && _hi < max_juint)
1398 return make(_lo, max_juint, WidenMax);
1399 else
1400 return make(_lo, max, WidenMax);
1401 } else {
1402 return make(min, _hi, WidenMax);
1403 }
1404 }
1405 return TypeLong::LONG;
1406 }
1407 // Returned widened new guy
1408 return make(_lo,_hi,_widen+1);
1409 }
1410
1411 // If old guy contains new, then we probably widened too far & dropped to
1412 // bottom. Return the wider fellow.
1413 if ( ot->_lo <= _lo && ot->_hi >= _hi )
1414 return old;
1415
1416 // fatal("Long value range is not subset");
1417 // return this;
1418 return TypeLong::LONG;
1419 }
1420
1421 //------------------------------narrow----------------------------------------
1422 // Only happens for pessimistic optimizations.
1423 const Type *TypeLong::narrow( const Type *old ) const {
1424 if (_lo >= _hi) return this; // already narrow enough
1425 if (old == NULL) return this;
1426 const TypeLong* ot = old->isa_long();
1427 if (ot == NULL) return this;
1428 jlong olo = ot->_lo;
1429 jlong ohi = ot->_hi;
1430
1431 // If new guy is equal to old guy, no narrowing
1432 if (_lo == olo && _hi == ohi) return old;
1433
1434 // If old guy was maximum range, allow the narrowing
1435 if (olo == min_jlong && ohi == max_jlong) return this;
1436
1437 if (_lo < olo || _hi > ohi)
1438 return this; // doesn't narrow; pretty wierd
1439
1440 // The new type narrows the old type, so look for a "death march".
1441 // See comments on PhaseTransform::saturate.
1442 julong nrange = _hi - _lo;
1443 julong orange = ohi - olo;
1444 if (nrange < max_julong - 1 && nrange > (orange >> 1) + (SMALLINT*2)) {
1445 // Use the new type only if the range shrinks a lot.
1446 // We do not want the optimizer computing 2^31 point by point.
1447 return old;
1448 }
1449
1450 return this;
1451 }
1452
1453 //-----------------------------filter------------------------------------------
1454 const Type *TypeLong::filter( const Type *kills ) const {
1455 const TypeLong* ft = join(kills)->isa_long();
1456 if (ft == NULL || ft->_lo > ft->_hi)
1457 return Type::TOP; // Canonical empty value
1458 if (ft->_widen < this->_widen) {
1459 // Do not allow the value of kill->_widen to affect the outcome.
1460 // The widen bits must be allowed to run freely through the graph.
1461 ft = TypeLong::make(ft->_lo, ft->_hi, this->_widen);
1462 }
1463 return ft;
1464 }
1465
1466 //------------------------------eq---------------------------------------------
1467 // Structural equality check for Type representations
1468 bool TypeLong::eq( const Type *t ) const {
1469 const TypeLong *r = t->is_long(); // Handy access
1470 return r->_lo == _lo && r->_hi == _hi && r->_widen == _widen;
1471 }
1472
1473 //------------------------------hash-------------------------------------------
1474 // Type-specific hashing function.
1475 int TypeLong::hash(void) const {
1476 return (int)(_lo+_hi+_widen+(int)Type::Long);
1477 }
1478
1479 //------------------------------is_finite--------------------------------------
1480 // Has a finite value
1481 bool TypeLong::is_finite() const {
1482 return true;
1483 }
1484
1485 //------------------------------dump2------------------------------------------
1486 // Dump TypeLong
1487 #ifndef PRODUCT
1488 static const char* longnamenear(jlong x, const char* xname, char* buf, jlong n) {
1489 if (n > x) {
1490 if (n >= x + 10000) return NULL;
1491 sprintf(buf, "%s+" INT64_FORMAT, xname, n - x);
1492 } else if (n < x) {
1493 if (n <= x - 10000) return NULL;
1494 sprintf(buf, "%s-" INT64_FORMAT, xname, x - n);
1495 } else {
1496 return xname;
1497 }
1498 return buf;
1499 }
1500
1501 static const char* longname(char* buf, jlong n) {
1502 const char* str;
1503 if (n == min_jlong)
1504 return "min";
1505 else if (n < min_jlong + 10000)
1506 sprintf(buf, "min+" INT64_FORMAT, n - min_jlong);
1507 else if (n == max_jlong)
1508 return "max";
1509 else if (n > max_jlong - 10000)
1510 sprintf(buf, "max-" INT64_FORMAT, max_jlong - n);
1511 else if ((str = longnamenear(max_juint, "maxuint", buf, n)) != NULL)
1512 return str;
1513 else if ((str = longnamenear(max_jint, "maxint", buf, n)) != NULL)
1514 return str;
1515 else if ((str = longnamenear(min_jint, "minint", buf, n)) != NULL)
1516 return str;
1517 else
1518 sprintf(buf, INT64_FORMAT, n);
1519 return buf;
1520 }
1521
1522 void TypeLong::dump2( Dict &d, uint depth, outputStream *st ) const {
1523 char buf[80], buf2[80];
1524 if (_lo == min_jlong && _hi == max_jlong)
1525 st->print("long");
1526 else if (is_con())
1527 st->print("long:%s", longname(buf, get_con()));
1528 else if (_hi == max_jlong)
1529 st->print("long:>=%s", longname(buf, _lo));
1530 else if (_lo == min_jlong)
1531 st->print("long:<=%s", longname(buf, _hi));
1532 else
1533 st->print("long:%s..%s", longname(buf, _lo), longname(buf2, _hi));
1534
1535 if (_widen != 0 && this != TypeLong::LONG)
1536 st->print(":%.*s", _widen, "wwww");
1537 }
1538 #endif
1539
1540 //------------------------------singleton--------------------------------------
1541 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1542 // constants
1543 bool TypeLong::singleton(void) const {
1544 return _lo >= _hi;
1545 }
1546
1547 bool TypeLong::empty(void) const {
1548 return _lo > _hi;
1549 }
1550
1551 //=============================================================================
1552 // Convenience common pre-built types.
1553 const TypeTuple *TypeTuple::IFBOTH; // Return both arms of IF as reachable
1554 const TypeTuple *TypeTuple::IFFALSE;
1555 const TypeTuple *TypeTuple::IFTRUE;
1556 const TypeTuple *TypeTuple::IFNEITHER;
1557 const TypeTuple *TypeTuple::LOOPBODY;
1558 const TypeTuple *TypeTuple::MEMBAR;
1559 const TypeTuple *TypeTuple::STORECONDITIONAL;
1560 const TypeTuple *TypeTuple::START_I2C;
1561 const TypeTuple *TypeTuple::INT_PAIR;
1562 const TypeTuple *TypeTuple::LONG_PAIR;
1563
1564
1565 //------------------------------make-------------------------------------------
1566 // Make a TypeTuple from the range of a method signature
1567 const TypeTuple *TypeTuple::make_range(ciSignature* sig) {
1568 ciType* return_type = sig->return_type();
1569 uint total_fields = TypeFunc::Parms + return_type->size();
1570 const Type **field_array = fields(total_fields);
1571 switch (return_type->basic_type()) {
1572 case T_LONG:
1573 field_array[TypeFunc::Parms] = TypeLong::LONG;
1574 field_array[TypeFunc::Parms+1] = Type::HALF;
1575 break;
1576 case T_DOUBLE:
1577 field_array[TypeFunc::Parms] = Type::DOUBLE;
1578 field_array[TypeFunc::Parms+1] = Type::HALF;
1579 break;
1580 case T_OBJECT:
1581 case T_ARRAY:
1582 case T_BOOLEAN:
1583 case T_CHAR:
1584 case T_FLOAT:
1585 case T_BYTE:
1586 case T_SHORT:
1587 case T_INT:
1588 field_array[TypeFunc::Parms] = get_const_type(return_type);
1589 break;
1590 case T_VOID:
1591 break;
1592 default:
1593 ShouldNotReachHere();
1594 }
1595 return (TypeTuple*)(new TypeTuple(total_fields,field_array))->hashcons();
1596 }
1597
1598 // Make a TypeTuple from the domain of a method signature
1599 const TypeTuple *TypeTuple::make_domain(ciInstanceKlass* recv, ciSignature* sig) {
1600 uint total_fields = TypeFunc::Parms + sig->size();
1601
1602 uint pos = TypeFunc::Parms;
1603 const Type **field_array;
1604 if (recv != NULL) {
1605 total_fields++;
1606 field_array = fields(total_fields);
1607 // Use get_const_type here because it respects UseUniqueSubclasses:
1608 field_array[pos++] = get_const_type(recv)->join(TypePtr::NOTNULL);
1609 } else {
1610 field_array = fields(total_fields);
1611 }
1612
1613 int i = 0;
1614 while (pos < total_fields) {
1615 ciType* type = sig->type_at(i);
1616
1617 switch (type->basic_type()) {
1618 case T_LONG:
1619 field_array[pos++] = TypeLong::LONG;
1620 field_array[pos++] = Type::HALF;
1621 break;
1622 case T_DOUBLE:
1623 field_array[pos++] = Type::DOUBLE;
1624 field_array[pos++] = Type::HALF;
1625 break;
1626 case T_OBJECT:
1627 case T_ARRAY:
1628 case T_BOOLEAN:
1629 case T_CHAR:
1630 case T_FLOAT:
1631 case T_BYTE:
1632 case T_SHORT:
1633 case T_INT:
1634 field_array[pos++] = get_const_type(type);
1635 break;
1636 default:
1637 ShouldNotReachHere();
1638 }
1639 i++;
1640 }
1641 return (TypeTuple*)(new TypeTuple(total_fields,field_array))->hashcons();
1642 }
1643
1644 const TypeTuple *TypeTuple::make( uint cnt, const Type **fields ) {
1645 return (TypeTuple*)(new TypeTuple(cnt,fields))->hashcons();
1646 }
1647
1648 //------------------------------fields-----------------------------------------
1649 // Subroutine call type with space allocated for argument types
1650 const Type **TypeTuple::fields( uint arg_cnt ) {
1651 const Type **flds = (const Type **)(Compile::current()->type_arena()->Amalloc_4((TypeFunc::Parms+arg_cnt)*sizeof(Type*) ));
1652 flds[TypeFunc::Control ] = Type::CONTROL;
1653 flds[TypeFunc::I_O ] = Type::ABIO;
1654 flds[TypeFunc::Memory ] = Type::MEMORY;
1655 flds[TypeFunc::FramePtr ] = TypeRawPtr::BOTTOM;
1656 flds[TypeFunc::ReturnAdr] = Type::RETURN_ADDRESS;
1657
1658 return flds;
1659 }
1660
1661 //------------------------------meet-------------------------------------------
1662 // Compute the MEET of two types. It returns a new Type object.
1663 const Type *TypeTuple::xmeet( const Type *t ) const {
1664 // Perform a fast test for common case; meeting the same types together.
1665 if( this == t ) return this; // Meeting same type-rep?
1666
1667 // Current "this->_base" is Tuple
1668 switch (t->base()) { // switch on original type
1669
1670 case Bottom: // Ye Olde Default
1671 return t;
1672
1673 default: // All else is a mistake
1674 typerr(t);
1675
1676 case Tuple: { // Meeting 2 signatures?
1677 const TypeTuple *x = t->is_tuple();
1678 assert( _cnt == x->_cnt, "" );
1679 const Type **fields = (const Type **)(Compile::current()->type_arena()->Amalloc_4( _cnt*sizeof(Type*) ));
1680 for( uint i=0; i<_cnt; i++ )
1681 fields[i] = field_at(i)->xmeet( x->field_at(i) );
1682 return TypeTuple::make(_cnt,fields);
1683 }
1684 case Top:
1685 break;
1686 }
1687 return this; // Return the double constant
1688 }
1689
1690 //------------------------------xdual------------------------------------------
1691 // Dual: compute field-by-field dual
1692 const Type *TypeTuple::xdual() const {
1693 const Type **fields = (const Type **)(Compile::current()->type_arena()->Amalloc_4( _cnt*sizeof(Type*) ));
1694 for( uint i=0; i<_cnt; i++ )
1695 fields[i] = _fields[i]->dual();
1696 return new TypeTuple(_cnt,fields);
1697 }
1698
1699 //------------------------------eq---------------------------------------------
1700 // Structural equality check for Type representations
1701 bool TypeTuple::eq( const Type *t ) const {
1702 const TypeTuple *s = (const TypeTuple *)t;
1703 if (_cnt != s->_cnt) return false; // Unequal field counts
1704 for (uint i = 0; i < _cnt; i++)
1705 if (field_at(i) != s->field_at(i)) // POINTER COMPARE! NO RECURSION!
1706 return false; // Missed
1707 return true;
1708 }
1709
1710 //------------------------------hash-------------------------------------------
1711 // Type-specific hashing function.
1712 int TypeTuple::hash(void) const {
1713 intptr_t sum = _cnt;
1714 for( uint i=0; i<_cnt; i++ )
1715 sum += (intptr_t)_fields[i]; // Hash on pointers directly
1716 return sum;
1717 }
1718
1719 //------------------------------dump2------------------------------------------
1720 // Dump signature Type
1721 #ifndef PRODUCT
1722 void TypeTuple::dump2( Dict &d, uint depth, outputStream *st ) const {
1723 st->print("{");
1724 if( !depth || d[this] ) { // Check for recursive print
1725 st->print("...}");
1726 return;
1727 }
1728 d.Insert((void*)this, (void*)this); // Stop recursion
1729 if( _cnt ) {
1730 uint i;
1731 for( i=0; i<_cnt-1; i++ ) {
1732 st->print("%d:", i);
1733 _fields[i]->dump2(d, depth-1, st);
1734 st->print(", ");
1735 }
1736 st->print("%d:", i);
1737 _fields[i]->dump2(d, depth-1, st);
1738 }
1739 st->print("}");
1740 }
1741 #endif
1742
1743 //------------------------------singleton--------------------------------------
1744 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1745 // constants (Ldi nodes). Singletons are integer, float or double constants
1746 // or a single symbol.
1747 bool TypeTuple::singleton(void) const {
1748 return false; // Never a singleton
1749 }
1750
1751 bool TypeTuple::empty(void) const {
1752 for( uint i=0; i<_cnt; i++ ) {
1753 if (_fields[i]->empty()) return true;
1754 }
1755 return false;
1756 }
1757
1758 //=============================================================================
1759 // Convenience common pre-built types.
1760
1761 inline const TypeInt* normalize_array_size(const TypeInt* size) {
1762 // Certain normalizations keep us sane when comparing types.
1763 // We do not want arrayOop variables to differ only by the wideness
1764 // of their index types. Pick minimum wideness, since that is the
1765 // forced wideness of small ranges anyway.
1766 if (size->_widen != Type::WidenMin)
1767 return TypeInt::make(size->_lo, size->_hi, Type::WidenMin);
1768 else
1769 return size;
1770 }
1771
1772 //------------------------------make-------------------------------------------
1773 const TypeAry *TypeAry::make( const Type *elem, const TypeInt *size) {
1774 if (UseCompressedOops && elem->isa_oopptr()) {
1775 elem = elem->make_narrowoop();
1776 }
1777 size = normalize_array_size(size);
1778 return (TypeAry*)(new TypeAry(elem,size))->hashcons();
1779 }
1780
1781 //------------------------------meet-------------------------------------------
1782 // Compute the MEET of two types. It returns a new Type object.
1783 const Type *TypeAry::xmeet( const Type *t ) const {
1784 // Perform a fast test for common case; meeting the same types together.
1785 if( this == t ) return this; // Meeting same type-rep?
1786
1787 // Current "this->_base" is Ary
1788 switch (t->base()) { // switch on original type
1789
1790 case Bottom: // Ye Olde Default
1791 return t;
1792
1793 default: // All else is a mistake
1794 typerr(t);
1795
1796 case Array: { // Meeting 2 arrays?
1797 const TypeAry *a = t->is_ary();
1798 return TypeAry::make(_elem->meet(a->_elem),
1799 _size->xmeet(a->_size)->is_int());
1800 }
1801 case Top:
1802 break;
1803 }
1804 return this; // Return the double constant
1805 }
1806
1807 //------------------------------xdual------------------------------------------
1808 // Dual: compute field-by-field dual
1809 const Type *TypeAry::xdual() const {
1810 const TypeInt* size_dual = _size->dual()->is_int();
1811 size_dual = normalize_array_size(size_dual);
1812 return new TypeAry( _elem->dual(), size_dual);
1813 }
1814
1815 //------------------------------eq---------------------------------------------
1816 // Structural equality check for Type representations
1817 bool TypeAry::eq( const Type *t ) const {
1818 const TypeAry *a = (const TypeAry*)t;
1819 return _elem == a->_elem &&
1820 _size == a->_size;
1821 }
1822
1823 //------------------------------hash-------------------------------------------
1824 // Type-specific hashing function.
1825 int TypeAry::hash(void) const {
1826 return (intptr_t)_elem + (intptr_t)_size;
1827 }
1828
1829 //----------------------interface_vs_oop---------------------------------------
1830 #ifdef ASSERT
1831 bool TypeAry::interface_vs_oop(const Type *t) const {
1832 const TypeAry* t_ary = t->is_ary();
1833 if (t_ary) {
1834 return _elem->interface_vs_oop(t_ary->_elem);
1835 }
1836 return false;
1837 }
1838 #endif
1839
1840 //------------------------------dump2------------------------------------------
1841 #ifndef PRODUCT
1842 void TypeAry::dump2( Dict &d, uint depth, outputStream *st ) const {
1843 _elem->dump2(d, depth, st);
1844 st->print("[");
1845 _size->dump2(d, depth, st);
1846 st->print("]");
1847 }
1848 #endif
1849
1850 //------------------------------singleton--------------------------------------
1851 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
1852 // constants (Ldi nodes). Singletons are integer, float or double constants
1853 // or a single symbol.
1854 bool TypeAry::singleton(void) const {
1855 return false; // Never a singleton
1856 }
1857
1858 bool TypeAry::empty(void) const {
1859 return _elem->empty() || _size->empty();
1860 }
1861
1862 //--------------------------ary_must_be_exact----------------------------------
1863 bool TypeAry::ary_must_be_exact() const {
1864 if (!UseExactTypes) return false;
1865 // This logic looks at the element type of an array, and returns true
1866 // if the element type is either a primitive or a final instance class.
1867 // In such cases, an array built on this ary must have no subclasses.
1868 if (_elem == BOTTOM) return false; // general array not exact
1869 if (_elem == TOP ) return false; // inverted general array not exact
1870 const TypeOopPtr* toop = NULL;
1871 if (UseCompressedOops && _elem->isa_narrowoop()) {
1872 toop = _elem->make_ptr()->isa_oopptr();
1873 } else {
1874 toop = _elem->isa_oopptr();
1875 }
1876 if (!toop) return true; // a primitive type, like int
1877 ciKlass* tklass = toop->klass();
1878 if (tklass == NULL) return false; // unloaded class
1879 if (!tklass->is_loaded()) return false; // unloaded class
1880 const TypeInstPtr* tinst;
1881 if (_elem->isa_narrowoop())
1882 tinst = _elem->make_ptr()->isa_instptr();
1883 else
1884 tinst = _elem->isa_instptr();
1885 if (tinst)
1886 return tklass->as_instance_klass()->is_final();
1887 const TypeAryPtr* tap;
1888 if (_elem->isa_narrowoop())
1889 tap = _elem->make_ptr()->isa_aryptr();
1890 else
1891 tap = _elem->isa_aryptr();
1892 if (tap)
1893 return tap->ary()->ary_must_be_exact();
1894 return false;
1895 }
1896
1897 //=============================================================================
1898 // Convenience common pre-built types.
1899 const TypePtr *TypePtr::NULL_PTR;
1900 const TypePtr *TypePtr::NOTNULL;
1901 const TypePtr *TypePtr::BOTTOM;
1902
1903 //------------------------------meet-------------------------------------------
1904 // Meet over the PTR enum
1905 const TypePtr::PTR TypePtr::ptr_meet[TypePtr::lastPTR][TypePtr::lastPTR] = {
1906 // TopPTR, AnyNull, Constant, Null, NotNull, BotPTR,
1907 { /* Top */ TopPTR, AnyNull, Constant, Null, NotNull, BotPTR,},
1908 { /* AnyNull */ AnyNull, AnyNull, Constant, BotPTR, NotNull, BotPTR,},
1909 { /* Constant*/ Constant, Constant, Constant, BotPTR, NotNull, BotPTR,},
1910 { /* Null */ Null, BotPTR, BotPTR, Null, BotPTR, BotPTR,},
1911 { /* NotNull */ NotNull, NotNull, NotNull, BotPTR, NotNull, BotPTR,},
1912 { /* BotPTR */ BotPTR, BotPTR, BotPTR, BotPTR, BotPTR, BotPTR,}
1913 };
1914
1915 //------------------------------make-------------------------------------------
1916 const TypePtr *TypePtr::make( TYPES t, enum PTR ptr, int offset ) {
1917 return (TypePtr*)(new TypePtr(t,ptr,offset))->hashcons();
1918 }
1919
1920 //------------------------------cast_to_ptr_type-------------------------------
1921 const Type *TypePtr::cast_to_ptr_type(PTR ptr) const {
1922 assert(_base == AnyPtr, "subclass must override cast_to_ptr_type");
1923 if( ptr == _ptr ) return this;
1924 return make(_base, ptr, _offset);
1925 }
1926
1927 //------------------------------get_con----------------------------------------
1928 intptr_t TypePtr::get_con() const {
1929 assert( _ptr == Null, "" );
1930 return _offset;
1931 }
1932
1933 //------------------------------meet-------------------------------------------
1934 // Compute the MEET of two types. It returns a new Type object.
1935 const Type *TypePtr::xmeet( const Type *t ) const {
1936 // Perform a fast test for common case; meeting the same types together.
1937 if( this == t ) return this; // Meeting same type-rep?
1938
1939 // Current "this->_base" is AnyPtr
1940 switch (t->base()) { // switch on original type
1941 case Int: // Mixing ints & oops happens when javac
1942 case Long: // reuses local variables
1943 case FloatTop:
1944 case FloatCon:
1945 case FloatBot:
1946 case DoubleTop:
1947 case DoubleCon:
1948 case DoubleBot:
1949 case NarrowOop:
1950 case Bottom: // Ye Olde Default
1951 return Type::BOTTOM;
1952 case Top:
1953 return this;
1954
1955 case AnyPtr: { // Meeting to AnyPtrs
1956 const TypePtr *tp = t->is_ptr();
1957 return make( AnyPtr, meet_ptr(tp->ptr()), meet_offset(tp->offset()) );
1958 }
1959 case RawPtr: // For these, flip the call around to cut down
1960 case OopPtr:
1961 case InstPtr: // on the cases I have to handle.
1962 case KlassPtr:
1963 case AryPtr:
1964 return t->xmeet(this); // Call in reverse direction
1965 default: // All else is a mistake
1966 typerr(t);
1967
1968 }
1969 return this;
1970 }
1971
1972 //------------------------------meet_offset------------------------------------
1973 int TypePtr::meet_offset( int offset ) const {
1974 // Either is 'TOP' offset? Return the other offset!
1975 if( _offset == OffsetTop ) return offset;
1976 if( offset == OffsetTop ) return _offset;
1977 // If either is different, return 'BOTTOM' offset
1978 if( _offset != offset ) return OffsetBot;
1979 return _offset;
1980 }
1981
1982 //------------------------------dual_offset------------------------------------
1983 int TypePtr::dual_offset( ) const {
1984 if( _offset == OffsetTop ) return OffsetBot;// Map 'TOP' into 'BOTTOM'
1985 if( _offset == OffsetBot ) return OffsetTop;// Map 'BOTTOM' into 'TOP'
1986 return _offset; // Map everything else into self
1987 }
1988
1989 //------------------------------xdual------------------------------------------
1990 // Dual: compute field-by-field dual
1991 const TypePtr::PTR TypePtr::ptr_dual[TypePtr::lastPTR] = {
1992 BotPTR, NotNull, Constant, Null, AnyNull, TopPTR
1993 };
1994 const Type *TypePtr::xdual() const {
1995 return new TypePtr( AnyPtr, dual_ptr(), dual_offset() );
1996 }
1997
1998 //------------------------------xadd_offset------------------------------------
1999 int TypePtr::xadd_offset( intptr_t offset ) const {
2000 // Adding to 'TOP' offset? Return 'TOP'!
2001 if( _offset == OffsetTop || offset == OffsetTop ) return OffsetTop;
2002 // Adding to 'BOTTOM' offset? Return 'BOTTOM'!
2003 if( _offset == OffsetBot || offset == OffsetBot ) return OffsetBot;
2004 // Addition overflows or "accidentally" equals to OffsetTop? Return 'BOTTOM'!
2005 offset += (intptr_t)_offset;
2006 if (offset != (int)offset || offset == OffsetTop) return OffsetBot;
2007
2008 // assert( _offset >= 0 && _offset+offset >= 0, "" );
2009 // It is possible to construct a negative offset during PhaseCCP
2010
2011 return (int)offset; // Sum valid offsets
2012 }
2013
2014 //------------------------------add_offset-------------------------------------
2015 const TypePtr *TypePtr::add_offset( intptr_t offset ) const {
2016 return make( AnyPtr, _ptr, xadd_offset(offset) );
2017 }
2018
2019 //------------------------------eq---------------------------------------------
2020 // Structural equality check for Type representations
2021 bool TypePtr::eq( const Type *t ) const {
2022 const TypePtr *a = (const TypePtr*)t;
2023 return _ptr == a->ptr() && _offset == a->offset();
2024 }
2025
2026 //------------------------------hash-------------------------------------------
2027 // Type-specific hashing function.
2028 int TypePtr::hash(void) const {
2029 return _ptr + _offset;
2030 }
2031
2032 //------------------------------dump2------------------------------------------
2033 const char *const TypePtr::ptr_msg[TypePtr::lastPTR] = {
2034 "TopPTR","AnyNull","Constant","NULL","NotNull","BotPTR"
2035 };
2036
2037 #ifndef PRODUCT
2038 void TypePtr::dump2( Dict &d, uint depth, outputStream *st ) const {
2039 if( _ptr == Null ) st->print("NULL");
2040 else st->print("%s *", ptr_msg[_ptr]);
2041 if( _offset == OffsetTop ) st->print("+top");
2042 else if( _offset == OffsetBot ) st->print("+bot");
2043 else if( _offset ) st->print("+%d", _offset);
2044 }
2045 #endif
2046
2047 //------------------------------singleton--------------------------------------
2048 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
2049 // constants
2050 bool TypePtr::singleton(void) const {
2051 // TopPTR, Null, AnyNull, Constant are all singletons
2052 return (_offset != OffsetBot) && !below_centerline(_ptr);
2053 }
2054
2055 bool TypePtr::empty(void) const {
2056 return (_offset == OffsetTop) || above_centerline(_ptr);
2057 }
2058
2059 //=============================================================================
2060 // Convenience common pre-built types.
2061 const TypeRawPtr *TypeRawPtr::BOTTOM;
2062 const TypeRawPtr *TypeRawPtr::NOTNULL;
2063
2064 //------------------------------make-------------------------------------------
2065 const TypeRawPtr *TypeRawPtr::make( enum PTR ptr ) {
2066 assert( ptr != Constant, "what is the constant?" );
2067 assert( ptr != Null, "Use TypePtr for NULL" );
2068 return (TypeRawPtr*)(new TypeRawPtr(ptr,0))->hashcons();
2069 }
2070
2071 const TypeRawPtr *TypeRawPtr::make( address bits ) {
2072 assert( bits, "Use TypePtr for NULL" );
2073 return (TypeRawPtr*)(new TypeRawPtr(Constant,bits))->hashcons();
2074 }
2075
2076 //------------------------------cast_to_ptr_type-------------------------------
2077 const Type *TypeRawPtr::cast_to_ptr_type(PTR ptr) const {
2078 assert( ptr != Constant, "what is the constant?" );
2079 assert( ptr != Null, "Use TypePtr for NULL" );
2080 assert( _bits==0, "Why cast a constant address?");
2081 if( ptr == _ptr ) return this;
2082 return make(ptr);
2083 }
2084
2085 //------------------------------get_con----------------------------------------
2086 intptr_t TypeRawPtr::get_con() const {
2087 assert( _ptr == Null || _ptr == Constant, "" );
2088 return (intptr_t)_bits;
2089 }
2090
2091 //------------------------------meet-------------------------------------------
2092 // Compute the MEET of two types. It returns a new Type object.
2093 const Type *TypeRawPtr::xmeet( const Type *t ) const {
2094 // Perform a fast test for common case; meeting the same types together.
2095 if( this == t ) return this; // Meeting same type-rep?
2096
2097 // Current "this->_base" is RawPtr
2098 switch( t->base() ) { // switch on original type
2099 case Bottom: // Ye Olde Default
2100 return t;
2101 case Top:
2102 return this;
2103 case AnyPtr: // Meeting to AnyPtrs
2104 break;
2105 case RawPtr: { // might be top, bot, any/not or constant
2106 enum PTR tptr = t->is_ptr()->ptr();
2107 enum PTR ptr = meet_ptr( tptr );
2108 if( ptr == Constant ) { // Cannot be equal constants, so...
2109 if( tptr == Constant && _ptr != Constant) return t;
2110 if( _ptr == Constant && tptr != Constant) return this;
2111 ptr = NotNull; // Fall down in lattice
2112 }
2113 return make( ptr );
2114 }
2115
2116 case OopPtr:
2117 case InstPtr:
2118 case KlassPtr:
2119 case AryPtr:
2120 return TypePtr::BOTTOM; // Oop meet raw is not well defined
2121 default: // All else is a mistake
2122 typerr(t);
2123 }
2124
2125 // Found an AnyPtr type vs self-RawPtr type
2126 const TypePtr *tp = t->is_ptr();
2127 switch (tp->ptr()) {
2128 case TypePtr::TopPTR: return this;
2129 case TypePtr::BotPTR: return t;
2130 case TypePtr::Null:
2131 if( _ptr == TypePtr::TopPTR ) return t;
2132 return TypeRawPtr::BOTTOM;
2133 case TypePtr::NotNull: return TypePtr::make( AnyPtr, meet_ptr(TypePtr::NotNull), tp->meet_offset(0) );
2134 case TypePtr::AnyNull:
2135 if( _ptr == TypePtr::Constant) return this;
2136 return make( meet_ptr(TypePtr::AnyNull) );
2137 default: ShouldNotReachHere();
2138 }
2139 return this;
2140 }
2141
2142 //------------------------------xdual------------------------------------------
2143 // Dual: compute field-by-field dual
2144 const Type *TypeRawPtr::xdual() const {
2145 return new TypeRawPtr( dual_ptr(), _bits );
2146 }
2147
2148 //------------------------------add_offset-------------------------------------
2149 const TypePtr *TypeRawPtr::add_offset( intptr_t offset ) const {
2150 if( offset == OffsetTop ) return BOTTOM; // Undefined offset-> undefined pointer
2151 if( offset == OffsetBot ) return BOTTOM; // Unknown offset-> unknown pointer
2152 if( offset == 0 ) return this; // No change
2153 switch (_ptr) {
2154 case TypePtr::TopPTR:
2155 case TypePtr::BotPTR:
2156 case TypePtr::NotNull:
2157 return this;
2158 case TypePtr::Null:
2159 case TypePtr::Constant:
2160 return make( _bits+offset );
2161 default: ShouldNotReachHere();
2162 }
2163 return NULL; // Lint noise
2164 }
2165
2166 //------------------------------eq---------------------------------------------
2167 // Structural equality check for Type representations
2168 bool TypeRawPtr::eq( const Type *t ) const {
2169 const TypeRawPtr *a = (const TypeRawPtr*)t;
2170 return _bits == a->_bits && TypePtr::eq(t);
2171 }
2172
2173 //------------------------------hash-------------------------------------------
2174 // Type-specific hashing function.
2175 int TypeRawPtr::hash(void) const {
2176 return (intptr_t)_bits + TypePtr::hash();
2177 }
2178
2179 //------------------------------dump2------------------------------------------
2180 #ifndef PRODUCT
2181 void TypeRawPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
2182 if( _ptr == Constant )
2183 st->print(INTPTR_FORMAT, _bits);
2184 else
2185 st->print("rawptr:%s", ptr_msg[_ptr]);
2186 }
2187 #endif
2188
2189 //=============================================================================
2190 // Convenience common pre-built type.
2191 const TypeOopPtr *TypeOopPtr::BOTTOM;
2192
2193 //------------------------------TypeOopPtr-------------------------------------
2194 TypeOopPtr::TypeOopPtr( TYPES t, PTR ptr, ciKlass* k, bool xk, ciObject* o, int offset, int instance_id )
2195 : TypePtr(t, ptr, offset),
2196 _const_oop(o), _klass(k),
2197 _klass_is_exact(xk),
2198 _is_ptr_to_narrowoop(false),
2199 _instance_id(instance_id) {
2200 #ifdef _LP64
2201 if (UseCompressedOops && _offset != 0) {
2202 if (klass() == NULL) {
2203 assert(this->isa_aryptr(), "only arrays without klass");
2204 _is_ptr_to_narrowoop = true;
2205 } else if (_offset == oopDesc::klass_offset_in_bytes()) {
2206 _is_ptr_to_narrowoop = true;
2207 } else if (this->isa_aryptr()) {
2208 _is_ptr_to_narrowoop = (klass()->is_obj_array_klass() &&
2209 _offset != arrayOopDesc::length_offset_in_bytes());
2210 } else if (klass() == ciEnv::current()->Class_klass() &&
2211 (_offset == java_lang_Class::klass_offset_in_bytes() ||
2212 _offset == java_lang_Class::array_klass_offset_in_bytes())) {
2213 // Special hidden fields from the Class.
2214 assert(this->isa_instptr(), "must be an instance ptr.");
2215 _is_ptr_to_narrowoop = true;
2216 } else if (klass()->is_instance_klass()) {
2217 ciInstanceKlass* ik = klass()->as_instance_klass();
2218 ciField* field = NULL;
2219 if (this->isa_klassptr()) {
2220 // Perm objects don't use compressed references, except for
2221 // static fields which are currently compressed.
2222 field = ik->get_field_by_offset(_offset, true);
2223 if (field != NULL) {
2224 BasicType basic_elem_type = field->layout_type();
2225 _is_ptr_to_narrowoop = (basic_elem_type == T_OBJECT ||
2226 basic_elem_type == T_ARRAY);
2227 }
2228 } else if (_offset == OffsetBot || _offset == OffsetTop) {
2229 // unsafe access
2230 _is_ptr_to_narrowoop = true;
2231 } else { // exclude unsafe ops
2232 assert(this->isa_instptr(), "must be an instance ptr.");
2233 // Field which contains a compressed oop references.
2234 field = ik->get_field_by_offset(_offset, false);
2235 if (field != NULL) {
2236 BasicType basic_elem_type = field->layout_type();
2237 _is_ptr_to_narrowoop = (basic_elem_type == T_OBJECT ||
2238 basic_elem_type == T_ARRAY);
2239 } else if (klass()->equals(ciEnv::current()->Object_klass())) {
2240 // Compile::find_alias_type() cast exactness on all types to verify
2241 // that it does not affect alias type.
2242 _is_ptr_to_narrowoop = true;
2243 } else {
2244 // Type for the copy start in LibraryCallKit::inline_native_clone().
2245 assert(!klass_is_exact(), "only non-exact klass");
2246 _is_ptr_to_narrowoop = true;
2247 }
2248 }
2249 }
2250 }
2251 #endif
2252 }
2253
2254 //------------------------------make-------------------------------------------
2255 const TypeOopPtr *TypeOopPtr::make(PTR ptr,
2256 int offset, int instance_id) {
2257 assert(ptr != Constant, "no constant generic pointers");
2258 ciKlass* k = ciKlassKlass::make();
2259 bool xk = false;
2260 ciObject* o = NULL;
2261 return (TypeOopPtr*)(new TypeOopPtr(OopPtr, ptr, k, xk, o, offset, instance_id))->hashcons();
2262 }
2263
2264
2265 //------------------------------cast_to_ptr_type-------------------------------
2266 const Type *TypeOopPtr::cast_to_ptr_type(PTR ptr) const {
2267 assert(_base == OopPtr, "subclass must override cast_to_ptr_type");
2268 if( ptr == _ptr ) return this;
2269 return make(ptr, _offset, _instance_id);
2270 }
2271
2272 //-----------------------------cast_to_instance_id----------------------------
2273 const TypeOopPtr *TypeOopPtr::cast_to_instance_id(int instance_id) const {
2274 // There are no instances of a general oop.
2275 // Return self unchanged.
2276 return this;
2277 }
2278
2279 //-----------------------------cast_to_exactness-------------------------------
2280 const Type *TypeOopPtr::cast_to_exactness(bool klass_is_exact) const {
2281 // There is no such thing as an exact general oop.
2282 // Return self unchanged.
2283 return this;
2284 }
2285
2286
2287 //------------------------------as_klass_type----------------------------------
2288 // Return the klass type corresponding to this instance or array type.
2289 // It is the type that is loaded from an object of this type.
2290 const TypeKlassPtr* TypeOopPtr::as_klass_type() const {
2291 ciKlass* k = klass();
2292 bool xk = klass_is_exact();
2293 if (k == NULL || !k->is_java_klass())
2294 return TypeKlassPtr::OBJECT;
2295 else
2296 return TypeKlassPtr::make(xk? Constant: NotNull, k, 0);
2297 }
2298
2299
2300 //------------------------------meet-------------------------------------------
2301 // Compute the MEET of two types. It returns a new Type object.
2302 const Type *TypeOopPtr::xmeet( const Type *t ) const {
2303 // Perform a fast test for common case; meeting the same types together.
2304 if( this == t ) return this; // Meeting same type-rep?
2305
2306 // Current "this->_base" is OopPtr
2307 switch (t->base()) { // switch on original type
2308
2309 case Int: // Mixing ints & oops happens when javac
2310 case Long: // reuses local variables
2311 case FloatTop:
2312 case FloatCon:
2313 case FloatBot:
2314 case DoubleTop:
2315 case DoubleCon:
2316 case DoubleBot:
2317 case NarrowOop:
2318 case Bottom: // Ye Olde Default
2319 return Type::BOTTOM;
2320 case Top:
2321 return this;
2322
2323 default: // All else is a mistake
2324 typerr(t);
2325
2326 case RawPtr:
2327 return TypePtr::BOTTOM; // Oop meet raw is not well defined
2328
2329 case AnyPtr: {
2330 // Found an AnyPtr type vs self-OopPtr type
2331 const TypePtr *tp = t->is_ptr();
2332 int offset = meet_offset(tp->offset());
2333 PTR ptr = meet_ptr(tp->ptr());
2334 switch (tp->ptr()) {
2335 case Null:
2336 if (ptr == Null) return TypePtr::make(AnyPtr, ptr, offset);
2337 // else fall through:
2338 case TopPTR:
2339 case AnyNull: {
2340 int instance_id = meet_instance_id(InstanceTop);
2341 return make(ptr, offset, instance_id);
2342 }
2343 case BotPTR:
2344 case NotNull:
2345 return TypePtr::make(AnyPtr, ptr, offset);
2346 default: typerr(t);
2347 }
2348 }
2349
2350 case OopPtr: { // Meeting to other OopPtrs
2351 const TypeOopPtr *tp = t->is_oopptr();
2352 int instance_id = meet_instance_id(tp->instance_id());
2353 return make( meet_ptr(tp->ptr()), meet_offset(tp->offset()), instance_id );
2354 }
2355
2356 case InstPtr: // For these, flip the call around to cut down
2357 case KlassPtr: // on the cases I have to handle.
2358 case AryPtr:
2359 return t->xmeet(this); // Call in reverse direction
2360
2361 } // End of switch
2362 return this; // Return the double constant
2363 }
2364
2365
2366 //------------------------------xdual------------------------------------------
2367 // Dual of a pure heap pointer. No relevant klass or oop information.
2368 const Type *TypeOopPtr::xdual() const {
2369 assert(klass() == ciKlassKlass::make(), "no klasses here");
2370 assert(const_oop() == NULL, "no constants here");
2371 return new TypeOopPtr(_base, dual_ptr(), klass(), klass_is_exact(), const_oop(), dual_offset(), dual_instance_id() );
2372 }
2373
2374 //--------------------------make_from_klass_common-----------------------------
2375 // Computes the element-type given a klass.
2376 const TypeOopPtr* TypeOopPtr::make_from_klass_common(ciKlass *klass, bool klass_change, bool try_for_exact) {
2377 assert(klass->is_java_klass(), "must be java language klass");
2378 if (klass->is_instance_klass()) {
2379 Compile* C = Compile::current();
2380 Dependencies* deps = C->dependencies();
2381 assert((deps != NULL) == (C->method() != NULL && C->method()->code_size() > 0), "sanity");
2382 // Element is an instance
2383 bool klass_is_exact = false;
2384 if (klass->is_loaded()) {
2385 // Try to set klass_is_exact.
2386 ciInstanceKlass* ik = klass->as_instance_klass();
2387 klass_is_exact = ik->is_final();
2388 if (!klass_is_exact && klass_change
2389 && deps != NULL && UseUniqueSubclasses) {
2390 ciInstanceKlass* sub = ik->unique_concrete_subklass();
2391 if (sub != NULL) {
2392 deps->assert_abstract_with_unique_concrete_subtype(ik, sub);
2393 klass = ik = sub;
2394 klass_is_exact = sub->is_final();
2395 }
2396 }
2397 if (!klass_is_exact && try_for_exact
2398 && deps != NULL && UseExactTypes) {
2399 if (!ik->is_interface() && !ik->has_subklass()) {
2400 // Add a dependence; if concrete subclass added we need to recompile
2401 deps->assert_leaf_type(ik);
2402 klass_is_exact = true;
2403 }
2404 }
2405 }
2406 return TypeInstPtr::make(TypePtr::BotPTR, klass, klass_is_exact, NULL, 0);
2407 } else if (klass->is_obj_array_klass()) {
2408 // Element is an object array. Recursively call ourself.
2409 const TypeOopPtr *etype = TypeOopPtr::make_from_klass_common(klass->as_obj_array_klass()->element_klass(), false, try_for_exact);
2410 bool xk = etype->klass_is_exact();
2411 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::POS);
2412 // We used to pass NotNull in here, asserting that the sub-arrays
2413 // are all not-null. This is not true in generally, as code can
2414 // slam NULLs down in the subarrays.
2415 const TypeAryPtr* arr = TypeAryPtr::make(TypePtr::BotPTR, arr0, klass, xk, 0);
2416 return arr;
2417 } else if (klass->is_type_array_klass()) {
2418 // Element is an typeArray
2419 const Type* etype = get_const_basic_type(klass->as_type_array_klass()->element_type());
2420 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::POS);
2421 // We used to pass NotNull in here, asserting that the array pointer
2422 // is not-null. That was not true in general.
2423 const TypeAryPtr* arr = TypeAryPtr::make(TypePtr::BotPTR, arr0, klass, true, 0);
2424 return arr;
2425 } else {
2426 ShouldNotReachHere();
2427 return NULL;
2428 }
2429 }
2430
2431 //------------------------------make_from_constant-----------------------------
2432 // Make a java pointer from an oop constant
2433 const TypeOopPtr* TypeOopPtr::make_from_constant(ciObject* o, bool require_constant) {
2434 if (o->is_method_data() || o->is_method() || o->is_cpcache()) {
2435 // Treat much like a typeArray of bytes, like below, but fake the type...
2436 const Type* etype = (Type*)get_const_basic_type(T_BYTE);
2437 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::POS);
2438 ciKlass *klass = ciTypeArrayKlass::make((BasicType) T_BYTE);
2439 assert(o->can_be_constant(), "method data oops should be tenured");
2440 const TypeAryPtr* arr = TypeAryPtr::make(TypePtr::Constant, o, arr0, klass, true, 0);
2441 return arr;
2442 } else {
2443 assert(o->is_java_object(), "must be java language object");
2444 assert(!o->is_null_object(), "null object not yet handled here.");
2445 ciKlass *klass = o->klass();
2446 if (klass->is_instance_klass()) {
2447 // Element is an instance
2448 if (require_constant) {
2449 if (!o->can_be_constant()) return NULL;
2450 } else if (!o->should_be_constant()) {
2451 return TypeInstPtr::make(TypePtr::NotNull, klass, true, NULL, 0);
2452 }
2453 return TypeInstPtr::make(o);
2454 } else if (klass->is_obj_array_klass()) {
2455 // Element is an object array. Recursively call ourself.
2456 const Type *etype =
2457 TypeOopPtr::make_from_klass_raw(klass->as_obj_array_klass()->element_klass());
2458 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::make(o->as_array()->length()));
2459 // We used to pass NotNull in here, asserting that the sub-arrays
2460 // are all not-null. This is not true in generally, as code can
2461 // slam NULLs down in the subarrays.
2462 if (require_constant) {
2463 if (!o->can_be_constant()) return NULL;
2464 } else if (!o->should_be_constant()) {
2465 return TypeAryPtr::make(TypePtr::NotNull, arr0, klass, true, 0);
2466 }
2467 const TypeAryPtr* arr = TypeAryPtr::make(TypePtr::Constant, o, arr0, klass, true, 0);
2468 return arr;
2469 } else if (klass->is_type_array_klass()) {
2470 // Element is an typeArray
2471 const Type* etype =
2472 (Type*)get_const_basic_type(klass->as_type_array_klass()->element_type());
2473 const TypeAry* arr0 = TypeAry::make(etype, TypeInt::make(o->as_array()->length()));
2474 // We used to pass NotNull in here, asserting that the array pointer
2475 // is not-null. That was not true in general.
2476 if (require_constant) {
2477 if (!o->can_be_constant()) return NULL;
2478 } else if (!o->should_be_constant()) {
2479 return TypeAryPtr::make(TypePtr::NotNull, arr0, klass, true, 0);
2480 }
2481 const TypeAryPtr* arr = TypeAryPtr::make(TypePtr::Constant, o, arr0, klass, true, 0);
2482 return arr;
2483 }
2484 }
2485
2486 ShouldNotReachHere();
2487 return NULL;
2488 }
2489
2490 //------------------------------get_con----------------------------------------
2491 intptr_t TypeOopPtr::get_con() const {
2492 assert( _ptr == Null || _ptr == Constant, "" );
2493 assert( _offset >= 0, "" );
2494
2495 if (_offset != 0) {
2496 // After being ported to the compiler interface, the compiler no longer
2497 // directly manipulates the addresses of oops. Rather, it only has a pointer
2498 // to a handle at compile time. This handle is embedded in the generated
2499 // code and dereferenced at the time the nmethod is made. Until that time,
2500 // it is not reasonable to do arithmetic with the addresses of oops (we don't
2501 // have access to the addresses!). This does not seem to currently happen,
2502 // but this assertion here is to help prevent its occurence.
2503 tty->print_cr("Found oop constant with non-zero offset");
2504 ShouldNotReachHere();
2505 }
2506
2507 return (intptr_t)const_oop()->constant_encoding();
2508 }
2509
2510
2511 //-----------------------------filter------------------------------------------
2512 // Do not allow interface-vs.-noninterface joins to collapse to top.
2513 const Type *TypeOopPtr::filter( const Type *kills ) const {
2514
2515 const Type* ft = join(kills);
2516 const TypeInstPtr* ftip = ft->isa_instptr();
2517 const TypeInstPtr* ktip = kills->isa_instptr();
2518 const TypeKlassPtr* ftkp = ft->isa_klassptr();
2519 const TypeKlassPtr* ktkp = kills->isa_klassptr();
2520
2521 if (ft->empty()) {
2522 // Check for evil case of 'this' being a class and 'kills' expecting an
2523 // interface. This can happen because the bytecodes do not contain
2524 // enough type info to distinguish a Java-level interface variable
2525 // from a Java-level object variable. If we meet 2 classes which
2526 // both implement interface I, but their meet is at 'j/l/O' which
2527 // doesn't implement I, we have no way to tell if the result should
2528 // be 'I' or 'j/l/O'. Thus we'll pick 'j/l/O'. If this then flows
2529 // into a Phi which "knows" it's an Interface type we'll have to
2530 // uplift the type.
2531 if (!empty() && ktip != NULL && ktip->is_loaded() && ktip->klass()->is_interface())
2532 return kills; // Uplift to interface
2533 if (!empty() && ktkp != NULL && ktkp->klass()->is_loaded() && ktkp->klass()->is_interface())
2534 return kills; // Uplift to interface
2535
2536 return Type::TOP; // Canonical empty value
2537 }
2538
2539 // If we have an interface-typed Phi or cast and we narrow to a class type,
2540 // the join should report back the class. However, if we have a J/L/Object
2541 // class-typed Phi and an interface flows in, it's possible that the meet &
2542 // join report an interface back out. This isn't possible but happens
2543 // because the type system doesn't interact well with interfaces.
2544 if (ftip != NULL && ktip != NULL &&
2545 ftip->is_loaded() && ftip->klass()->is_interface() &&
2546 ktip->is_loaded() && !ktip->klass()->is_interface()) {
2547 // Happens in a CTW of rt.jar, 320-341, no extra flags
2548 return ktip->cast_to_ptr_type(ftip->ptr());
2549 }
2550 if (ftkp != NULL && ktkp != NULL &&
2551 ftkp->is_loaded() && ftkp->klass()->is_interface() &&
2552 ktkp->is_loaded() && !ktkp->klass()->is_interface()) {
2553 // Happens in a CTW of rt.jar, 320-341, no extra flags
2554 return ktkp->cast_to_ptr_type(ftkp->ptr());
2555 }
2556
2557 return ft;
2558 }
2559
2560 //------------------------------eq---------------------------------------------
2561 // Structural equality check for Type representations
2562 bool TypeOopPtr::eq( const Type *t ) const {
2563 const TypeOopPtr *a = (const TypeOopPtr*)t;
2564 if (_klass_is_exact != a->_klass_is_exact ||
2565 _instance_id != a->_instance_id) return false;
2566 ciObject* one = const_oop();
2567 ciObject* two = a->const_oop();
2568 if (one == NULL || two == NULL) {
2569 return (one == two) && TypePtr::eq(t);
2570 } else {
2571 return one->equals(two) && TypePtr::eq(t);
2572 }
2573 }
2574
2575 //------------------------------hash-------------------------------------------
2576 // Type-specific hashing function.
2577 int TypeOopPtr::hash(void) const {
2578 return
2579 (const_oop() ? const_oop()->hash() : 0) +
2580 _klass_is_exact +
2581 _instance_id +
2582 TypePtr::hash();
2583 }
2584
2585 //------------------------------dump2------------------------------------------
2586 #ifndef PRODUCT
2587 void TypeOopPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
2588 st->print("oopptr:%s", ptr_msg[_ptr]);
2589 if( _klass_is_exact ) st->print(":exact");
2590 if( const_oop() ) st->print(INTPTR_FORMAT, const_oop());
2591 switch( _offset ) {
2592 case OffsetTop: st->print("+top"); break;
2593 case OffsetBot: st->print("+any"); break;
2594 case 0: break;
2595 default: st->print("+%d",_offset); break;
2596 }
2597 if (_instance_id == InstanceTop)
2598 st->print(",iid=top");
2599 else if (_instance_id != InstanceBot)
2600 st->print(",iid=%d",_instance_id);
2601 }
2602 #endif
2603
2604 //------------------------------singleton--------------------------------------
2605 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
2606 // constants
2607 bool TypeOopPtr::singleton(void) const {
2608 // detune optimizer to not generate constant oop + constant offset as a constant!
2609 // TopPTR, Null, AnyNull, Constant are all singletons
2610 return (_offset == 0) && !below_centerline(_ptr);
2611 }
2612
2613 //------------------------------add_offset-------------------------------------
2614 const TypePtr *TypeOopPtr::add_offset( intptr_t offset ) const {
2615 return make( _ptr, xadd_offset(offset), _instance_id);
2616 }
2617
2618 //------------------------------meet_instance_id--------------------------------
2619 int TypeOopPtr::meet_instance_id( int instance_id ) const {
2620 // Either is 'TOP' instance? Return the other instance!
2621 if( _instance_id == InstanceTop ) return instance_id;
2622 if( instance_id == InstanceTop ) return _instance_id;
2623 // If either is different, return 'BOTTOM' instance
2624 if( _instance_id != instance_id ) return InstanceBot;
2625 return _instance_id;
2626 }
2627
2628 //------------------------------dual_instance_id--------------------------------
2629 int TypeOopPtr::dual_instance_id( ) const {
2630 if( _instance_id == InstanceTop ) return InstanceBot; // Map TOP into BOTTOM
2631 if( _instance_id == InstanceBot ) return InstanceTop; // Map BOTTOM into TOP
2632 return _instance_id; // Map everything else into self
2633 }
2634
2635
2636 //=============================================================================
2637 // Convenience common pre-built types.
2638 const TypeInstPtr *TypeInstPtr::NOTNULL;
2639 const TypeInstPtr *TypeInstPtr::BOTTOM;
2640 const TypeInstPtr *TypeInstPtr::MIRROR;
2641 const TypeInstPtr *TypeInstPtr::MARK;
2642 const TypeInstPtr *TypeInstPtr::KLASS;
2643
2644 //------------------------------TypeInstPtr-------------------------------------
2645 TypeInstPtr::TypeInstPtr(PTR ptr, ciKlass* k, bool xk, ciObject* o, int off, int instance_id)
2646 : TypeOopPtr(InstPtr, ptr, k, xk, o, off, instance_id), _name(k->name()) {
2647 assert(k != NULL &&
2648 (k->is_loaded() || o == NULL),
2649 "cannot have constants with non-loaded klass");
2650 };
2651
2652 //------------------------------make-------------------------------------------
2653 const TypeInstPtr *TypeInstPtr::make(PTR ptr,
2654 ciKlass* k,
2655 bool xk,
2656 ciObject* o,
2657 int offset,
2658 int instance_id) {
2659 assert( !k->is_loaded() || k->is_instance_klass() ||
2660 k->is_method_klass(), "Must be for instance or method");
2661 // Either const_oop() is NULL or else ptr is Constant
2662 assert( (!o && ptr != Constant) || (o && ptr == Constant),
2663 "constant pointers must have a value supplied" );
2664 // Ptr is never Null
2665 assert( ptr != Null, "NULL pointers are not typed" );
2666
2667 assert(instance_id <= 0 || xk || !UseExactTypes, "instances are always exactly typed");
2668 if (!UseExactTypes) xk = false;
2669 if (ptr == Constant) {
2670 // Note: This case includes meta-object constants, such as methods.
2671 xk = true;
2672 } else if (k->is_loaded()) {
2673 ciInstanceKlass* ik = k->as_instance_klass();
2674 if (!xk && ik->is_final()) xk = true; // no inexact final klass
2675 if (xk && ik->is_interface()) xk = false; // no exact interface
2676 }
2677
2678 // Now hash this baby
2679 TypeInstPtr *result =
2680 (TypeInstPtr*)(new TypeInstPtr(ptr, k, xk, o ,offset, instance_id))->hashcons();
2681
2682 return result;
2683 }
2684
2685
2686 //------------------------------cast_to_ptr_type-------------------------------
2687 const Type *TypeInstPtr::cast_to_ptr_type(PTR ptr) const {
2688 if( ptr == _ptr ) return this;
2689 // Reconstruct _sig info here since not a problem with later lazy
2690 // construction, _sig will show up on demand.
2691 return make(ptr, klass(), klass_is_exact(), const_oop(), _offset, _instance_id);
2692 }
2693
2694
2695 //-----------------------------cast_to_exactness-------------------------------
2696 const Type *TypeInstPtr::cast_to_exactness(bool klass_is_exact) const {
2697 if( klass_is_exact == _klass_is_exact ) return this;
2698 if (!UseExactTypes) return this;
2699 if (!_klass->is_loaded()) return this;
2700 ciInstanceKlass* ik = _klass->as_instance_klass();
2701 if( (ik->is_final() || _const_oop) ) return this; // cannot clear xk
2702 if( ik->is_interface() ) return this; // cannot set xk
2703 return make(ptr(), klass(), klass_is_exact, const_oop(), _offset, _instance_id);
2704 }
2705
2706 //-----------------------------cast_to_instance_id----------------------------
2707 const TypeOopPtr *TypeInstPtr::cast_to_instance_id(int instance_id) const {
2708 if( instance_id == _instance_id ) return this;
2709 return make(_ptr, klass(), _klass_is_exact, const_oop(), _offset, instance_id);
2710 }
2711
2712 //------------------------------xmeet_unloaded---------------------------------
2713 // Compute the MEET of two InstPtrs when at least one is unloaded.
2714 // Assume classes are different since called after check for same name/class-loader
2715 const TypeInstPtr *TypeInstPtr::xmeet_unloaded(const TypeInstPtr *tinst) const {
2716 int off = meet_offset(tinst->offset());
2717 PTR ptr = meet_ptr(tinst->ptr());
2718 int instance_id = meet_instance_id(tinst->instance_id());
2719
2720 const TypeInstPtr *loaded = is_loaded() ? this : tinst;
2721 const TypeInstPtr *unloaded = is_loaded() ? tinst : this;
2722 if( loaded->klass()->equals(ciEnv::current()->Object_klass()) ) {
2723 //
2724 // Meet unloaded class with java/lang/Object
2725 //
2726 // Meet
2727 // | Unloaded Class
2728 // Object | TOP | AnyNull | Constant | NotNull | BOTTOM |
2729 // ===================================================================
2730 // TOP | ..........................Unloaded......................|
2731 // AnyNull | U-AN |................Unloaded......................|
2732 // Constant | ... O-NN .................................. | O-BOT |
2733 // NotNull | ... O-NN .................................. | O-BOT |
2734 // BOTTOM | ........................Object-BOTTOM ..................|
2735 //
2736 assert(loaded->ptr() != TypePtr::Null, "insanity check");
2737 //
2738 if( loaded->ptr() == TypePtr::TopPTR ) { return unloaded; }
2739 else if (loaded->ptr() == TypePtr::AnyNull) { return TypeInstPtr::make( ptr, unloaded->klass(), false, NULL, off, instance_id ); }
2740 else if (loaded->ptr() == TypePtr::BotPTR ) { return TypeInstPtr::BOTTOM; }
2741 else if (loaded->ptr() == TypePtr::Constant || loaded->ptr() == TypePtr::NotNull) {
2742 if (unloaded->ptr() == TypePtr::BotPTR ) { return TypeInstPtr::BOTTOM; }
2743 else { return TypeInstPtr::NOTNULL; }
2744 }
2745 else if( unloaded->ptr() == TypePtr::TopPTR ) { return unloaded; }
2746
2747 return unloaded->cast_to_ptr_type(TypePtr::AnyNull)->is_instptr();
2748 }
2749
2750 // Both are unloaded, not the same class, not Object
2751 // Or meet unloaded with a different loaded class, not java/lang/Object
2752 if( ptr != TypePtr::BotPTR ) {
2753 return TypeInstPtr::NOTNULL;
2754 }
2755 return TypeInstPtr::BOTTOM;
2756 }
2757
2758
2759 //------------------------------meet-------------------------------------------
2760 // Compute the MEET of two types. It returns a new Type object.
2761 const Type *TypeInstPtr::xmeet( const Type *t ) const {
2762 // Perform a fast test for common case; meeting the same types together.
2763 if( this == t ) return this; // Meeting same type-rep?
2764
2765 // Current "this->_base" is Pointer
2766 switch (t->base()) { // switch on original type
2767
2768 case Int: // Mixing ints & oops happens when javac
2769 case Long: // reuses local variables
2770 case FloatTop:
2771 case FloatCon:
2772 case FloatBot:
2773 case DoubleTop:
2774 case DoubleCon:
2775 case DoubleBot:
2776 case NarrowOop:
2777 case Bottom: // Ye Olde Default
2778 return Type::BOTTOM;
2779 case Top:
2780 return this;
2781
2782 default: // All else is a mistake
2783 typerr(t);
2784
2785 case RawPtr: return TypePtr::BOTTOM;
2786
2787 case AryPtr: { // All arrays inherit from Object class
2788 const TypeAryPtr *tp = t->is_aryptr();
2789 int offset = meet_offset(tp->offset());
2790 PTR ptr = meet_ptr(tp->ptr());
2791 int instance_id = meet_instance_id(tp->instance_id());
2792 switch (ptr) {
2793 case TopPTR:
2794 case AnyNull: // Fall 'down' to dual of object klass
2795 if (klass()->equals(ciEnv::current()->Object_klass())) {
2796 return TypeAryPtr::make(ptr, tp->ary(), tp->klass(), tp->klass_is_exact(), offset, instance_id);
2797 } else {
2798 // cannot subclass, so the meet has to fall badly below the centerline
2799 ptr = NotNull;
2800 instance_id = InstanceBot;
2801 return TypeInstPtr::make( ptr, ciEnv::current()->Object_klass(), false, NULL, offset, instance_id);
2802 }
2803 case Constant:
2804 case NotNull:
2805 case BotPTR: // Fall down to object klass
2806 // LCA is object_klass, but if we subclass from the top we can do better
2807 if( above_centerline(_ptr) ) { // if( _ptr == TopPTR || _ptr == AnyNull )
2808 // If 'this' (InstPtr) is above the centerline and it is Object class
2809 // then we can subclass in the Java class hierarchy.
2810 if (klass()->equals(ciEnv::current()->Object_klass())) {
2811 // that is, tp's array type is a subtype of my klass
2812 return TypeAryPtr::make(ptr, tp->ary(), tp->klass(), tp->klass_is_exact(), offset, instance_id);
2813 }
2814 }
2815 // The other case cannot happen, since I cannot be a subtype of an array.
2816 // The meet falls down to Object class below centerline.
2817 if( ptr == Constant )
2818 ptr = NotNull;
2819 instance_id = InstanceBot;
2820 return make( ptr, ciEnv::current()->Object_klass(), false, NULL, offset, instance_id );
2821 default: typerr(t);
2822 }
2823 }
2824
2825 case OopPtr: { // Meeting to OopPtrs
2826 // Found a OopPtr type vs self-InstPtr type
2827 const TypeOopPtr *tp = t->is_oopptr();
2828 int offset = meet_offset(tp->offset());
2829 PTR ptr = meet_ptr(tp->ptr());
2830 switch (tp->ptr()) {
2831 case TopPTR:
2832 case AnyNull: {
2833 int instance_id = meet_instance_id(InstanceTop);
2834 return make(ptr, klass(), klass_is_exact(),
2835 (ptr == Constant ? const_oop() : NULL), offset, instance_id);
2836 }
2837 case NotNull:
2838 case BotPTR: {
2839 int instance_id = meet_instance_id(tp->instance_id());
2840 return TypeOopPtr::make(ptr, offset, instance_id);
2841 }
2842 default: typerr(t);
2843 }
2844 }
2845
2846 case AnyPtr: { // Meeting to AnyPtrs
2847 // Found an AnyPtr type vs self-InstPtr type
2848 const TypePtr *tp = t->is_ptr();
2849 int offset = meet_offset(tp->offset());
2850 PTR ptr = meet_ptr(tp->ptr());
2851 switch (tp->ptr()) {
2852 case Null:
2853 if( ptr == Null ) return TypePtr::make( AnyPtr, ptr, offset );
2854 // else fall through to AnyNull
2855 case TopPTR:
2856 case AnyNull: {
2857 int instance_id = meet_instance_id(InstanceTop);
2858 return make( ptr, klass(), klass_is_exact(),
2859 (ptr == Constant ? const_oop() : NULL), offset, instance_id);
2860 }
2861 case NotNull:
2862 case BotPTR:
2863 return TypePtr::make( AnyPtr, ptr, offset );
2864 default: typerr(t);
2865 }
2866 }
2867
2868 /*
2869 A-top }
2870 / | \ } Tops
2871 B-top A-any C-top }
2872 | / | \ | } Any-nulls
2873 B-any | C-any }
2874 | | |
2875 B-con A-con C-con } constants; not comparable across classes
2876 | | |
2877 B-not | C-not }
2878 | \ | / | } not-nulls
2879 B-bot A-not C-bot }
2880 \ | / } Bottoms
2881 A-bot }
2882 */
2883
2884 case InstPtr: { // Meeting 2 Oops?
2885 // Found an InstPtr sub-type vs self-InstPtr type
2886 const TypeInstPtr *tinst = t->is_instptr();
2887 int off = meet_offset( tinst->offset() );
2888 PTR ptr = meet_ptr( tinst->ptr() );
2889 int instance_id = meet_instance_id(tinst->instance_id());
2890
2891 // Check for easy case; klasses are equal (and perhaps not loaded!)
2892 // If we have constants, then we created oops so classes are loaded
2893 // and we can handle the constants further down. This case handles
2894 // both-not-loaded or both-loaded classes
2895 if (ptr != Constant && klass()->equals(tinst->klass()) && klass_is_exact() == tinst->klass_is_exact()) {
2896 return make( ptr, klass(), klass_is_exact(), NULL, off, instance_id );
2897 }
2898
2899 // Classes require inspection in the Java klass hierarchy. Must be loaded.
2900 ciKlass* tinst_klass = tinst->klass();
2901 ciKlass* this_klass = this->klass();
2902 bool tinst_xk = tinst->klass_is_exact();
2903 bool this_xk = this->klass_is_exact();
2904 if (!tinst_klass->is_loaded() || !this_klass->is_loaded() ) {
2905 // One of these classes has not been loaded
2906 const TypeInstPtr *unloaded_meet = xmeet_unloaded(tinst);
2907 #ifndef PRODUCT
2908 if( PrintOpto && Verbose ) {
2909 tty->print("meet of unloaded classes resulted in: "); unloaded_meet->dump(); tty->cr();
2910 tty->print(" this == "); this->dump(); tty->cr();
2911 tty->print(" tinst == "); tinst->dump(); tty->cr();
2912 }
2913 #endif
2914 return unloaded_meet;
2915 }
2916
2917 // Handle mixing oops and interfaces first.
2918 if( this_klass->is_interface() && !tinst_klass->is_interface() ) {
2919 ciKlass *tmp = tinst_klass; // Swap interface around
2920 tinst_klass = this_klass;
2921 this_klass = tmp;
2922 bool tmp2 = tinst_xk;
2923 tinst_xk = this_xk;
2924 this_xk = tmp2;
2925 }
2926 if (tinst_klass->is_interface() &&
2927 !(this_klass->is_interface() ||
2928 // Treat java/lang/Object as an honorary interface,
2929 // because we need a bottom for the interface hierarchy.
2930 this_klass == ciEnv::current()->Object_klass())) {
2931 // Oop meets interface!
2932
2933 // See if the oop subtypes (implements) interface.
2934 ciKlass *k;
2935 bool xk;
2936 if( this_klass->is_subtype_of( tinst_klass ) ) {
2937 // Oop indeed subtypes. Now keep oop or interface depending
2938 // on whether we are both above the centerline or either is
2939 // below the centerline. If we are on the centerline
2940 // (e.g., Constant vs. AnyNull interface), use the constant.
2941 k = below_centerline(ptr) ? tinst_klass : this_klass;
2942 // If we are keeping this_klass, keep its exactness too.
2943 xk = below_centerline(ptr) ? tinst_xk : this_xk;
2944 } else { // Does not implement, fall to Object
2945 // Oop does not implement interface, so mixing falls to Object
2946 // just like the verifier does (if both are above the
2947 // centerline fall to interface)
2948 k = above_centerline(ptr) ? tinst_klass : ciEnv::current()->Object_klass();
2949 xk = above_centerline(ptr) ? tinst_xk : false;
2950 // Watch out for Constant vs. AnyNull interface.
2951 if (ptr == Constant) ptr = NotNull; // forget it was a constant
2952 instance_id = InstanceBot;
2953 }
2954 ciObject* o = NULL; // the Constant value, if any
2955 if (ptr == Constant) {
2956 // Find out which constant.
2957 o = (this_klass == klass()) ? const_oop() : tinst->const_oop();
2958 }
2959 return make( ptr, k, xk, o, off, instance_id );
2960 }
2961
2962 // Either oop vs oop or interface vs interface or interface vs Object
2963
2964 // !!! Here's how the symmetry requirement breaks down into invariants:
2965 // If we split one up & one down AND they subtype, take the down man.
2966 // If we split one up & one down AND they do NOT subtype, "fall hard".
2967 // If both are up and they subtype, take the subtype class.
2968 // If both are up and they do NOT subtype, "fall hard".
2969 // If both are down and they subtype, take the supertype class.
2970 // If both are down and they do NOT subtype, "fall hard".
2971 // Constants treated as down.
2972
2973 // Now, reorder the above list; observe that both-down+subtype is also
2974 // "fall hard"; "fall hard" becomes the default case:
2975 // If we split one up & one down AND they subtype, take the down man.
2976 // If both are up and they subtype, take the subtype class.
2977
2978 // If both are down and they subtype, "fall hard".
2979 // If both are down and they do NOT subtype, "fall hard".
2980 // If both are up and they do NOT subtype, "fall hard".
2981 // If we split one up & one down AND they do NOT subtype, "fall hard".
2982
2983 // If a proper subtype is exact, and we return it, we return it exactly.
2984 // If a proper supertype is exact, there can be no subtyping relationship!
2985 // If both types are equal to the subtype, exactness is and-ed below the
2986 // centerline and or-ed above it. (N.B. Constants are always exact.)
2987
2988 // Check for subtyping:
2989 ciKlass *subtype = NULL;
2990 bool subtype_exact = false;
2991 if( tinst_klass->equals(this_klass) ) {
2992 subtype = this_klass;
2993 subtype_exact = below_centerline(ptr) ? (this_xk & tinst_xk) : (this_xk | tinst_xk);
2994 } else if( !tinst_xk && this_klass->is_subtype_of( tinst_klass ) ) {
2995 subtype = this_klass; // Pick subtyping class
2996 subtype_exact = this_xk;
2997 } else if( !this_xk && tinst_klass->is_subtype_of( this_klass ) ) {
2998 subtype = tinst_klass; // Pick subtyping class
2999 subtype_exact = tinst_xk;
3000 }
3001
3002 if( subtype ) {
3003 if( above_centerline(ptr) ) { // both are up?
3004 this_klass = tinst_klass = subtype;
3005 this_xk = tinst_xk = subtype_exact;
3006 } else if( above_centerline(this ->_ptr) && !above_centerline(tinst->_ptr) ) {
3007 this_klass = tinst_klass; // tinst is down; keep down man
3008 this_xk = tinst_xk;
3009 } else if( above_centerline(tinst->_ptr) && !above_centerline(this ->_ptr) ) {
3010 tinst_klass = this_klass; // this is down; keep down man
3011 tinst_xk = this_xk;
3012 } else {
3013 this_xk = subtype_exact; // either they are equal, or we'll do an LCA
3014 }
3015 }
3016
3017 // Check for classes now being equal
3018 if (tinst_klass->equals(this_klass)) {
3019 // If the klasses are equal, the constants may still differ. Fall to
3020 // NotNull if they do (neither constant is NULL; that is a special case
3021 // handled elsewhere).
3022 ciObject* o = NULL; // Assume not constant when done
3023 ciObject* this_oop = const_oop();
3024 ciObject* tinst_oop = tinst->const_oop();
3025 if( ptr == Constant ) {
3026 if (this_oop != NULL && tinst_oop != NULL &&
3027 this_oop->equals(tinst_oop) )
3028 o = this_oop;
3029 else if (above_centerline(this ->_ptr))
3030 o = tinst_oop;
3031 else if (above_centerline(tinst ->_ptr))
3032 o = this_oop;
3033 else
3034 ptr = NotNull;
3035 }
3036 return make( ptr, this_klass, this_xk, o, off, instance_id );
3037 } // Else classes are not equal
3038
3039 // Since klasses are different, we require a LCA in the Java
3040 // class hierarchy - which means we have to fall to at least NotNull.
3041 if( ptr == TopPTR || ptr == AnyNull || ptr == Constant )
3042 ptr = NotNull;
3043 instance_id = InstanceBot;
3044
3045 // Now we find the LCA of Java classes
3046 ciKlass* k = this_klass->least_common_ancestor(tinst_klass);
3047 return make( ptr, k, false, NULL, off, instance_id );
3048 } // End of case InstPtr
3049
3050 case KlassPtr:
3051 return TypeInstPtr::BOTTOM;
3052
3053 } // End of switch
3054 return this; // Return the double constant
3055 }
3056
3057
3058 //------------------------java_mirror_type--------------------------------------
3059 ciType* TypeInstPtr::java_mirror_type() const {
3060 // must be a singleton type
3061 if( const_oop() == NULL ) return NULL;
3062
3063 // must be of type java.lang.Class
3064 if( klass() != ciEnv::current()->Class_klass() ) return NULL;
3065
3066 return const_oop()->as_instance()->java_mirror_type();
3067 }
3068
3069
3070 //------------------------------xdual------------------------------------------
3071 // Dual: do NOT dual on klasses. This means I do NOT understand the Java
3072 // inheritance mechanism.
3073 const Type *TypeInstPtr::xdual() const {
3074 return new TypeInstPtr( dual_ptr(), klass(), klass_is_exact(), const_oop(), dual_offset(), dual_instance_id() );
3075 }
3076
3077 //------------------------------eq---------------------------------------------
3078 // Structural equality check for Type representations
3079 bool TypeInstPtr::eq( const Type *t ) const {
3080 const TypeInstPtr *p = t->is_instptr();
3081 return
3082 klass()->equals(p->klass()) &&
3083 TypeOopPtr::eq(p); // Check sub-type stuff
3084 }
3085
3086 //------------------------------hash-------------------------------------------
3087 // Type-specific hashing function.
3088 int TypeInstPtr::hash(void) const {
3089 int hash = klass()->hash() + TypeOopPtr::hash();
3090 return hash;
3091 }
3092
3093 //------------------------------dump2------------------------------------------
3094 // Dump oop Type
3095 #ifndef PRODUCT
3096 void TypeInstPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
3097 // Print the name of the klass.
3098 klass()->print_name_on(st);
3099
3100 switch( _ptr ) {
3101 case Constant:
3102 // TO DO: Make CI print the hex address of the underlying oop.
3103 if (WizardMode || Verbose) {
3104 const_oop()->print_oop(st);
3105 }
3106 case BotPTR:
3107 if (!WizardMode && !Verbose) {
3108 if( _klass_is_exact ) st->print(":exact");
3109 break;
3110 }
3111 case TopPTR:
3112 case AnyNull:
3113 case NotNull:
3114 st->print(":%s", ptr_msg[_ptr]);
3115 if( _klass_is_exact ) st->print(":exact");
3116 break;
3117 }
3118
3119 if( _offset ) { // Dump offset, if any
3120 if( _offset == OffsetBot ) st->print("+any");
3121 else if( _offset == OffsetTop ) st->print("+unknown");
3122 else st->print("+%d", _offset);
3123 }
3124
3125 st->print(" *");
3126 if (_instance_id == InstanceTop)
3127 st->print(",iid=top");
3128 else if (_instance_id != InstanceBot)
3129 st->print(",iid=%d",_instance_id);
3130 }
3131 #endif
3132
3133 //------------------------------add_offset-------------------------------------
3134 const TypePtr *TypeInstPtr::add_offset( intptr_t offset ) const {
3135 return make( _ptr, klass(), klass_is_exact(), const_oop(), xadd_offset(offset), _instance_id );
3136 }
3137
3138 //=============================================================================
3139 // Convenience common pre-built types.
3140 const TypeAryPtr *TypeAryPtr::RANGE;
3141 const TypeAryPtr *TypeAryPtr::OOPS;
3142 const TypeAryPtr *TypeAryPtr::NARROWOOPS;
3143 const TypeAryPtr *TypeAryPtr::BYTES;
3144 const TypeAryPtr *TypeAryPtr::SHORTS;
3145 const TypeAryPtr *TypeAryPtr::CHARS;
3146 const TypeAryPtr *TypeAryPtr::INTS;
3147 const TypeAryPtr *TypeAryPtr::LONGS;
3148 const TypeAryPtr *TypeAryPtr::FLOATS;
3149 const TypeAryPtr *TypeAryPtr::DOUBLES;
3150
3151 //------------------------------make-------------------------------------------
3152 const TypeAryPtr *TypeAryPtr::make( PTR ptr, const TypeAry *ary, ciKlass* k, bool xk, int offset, int instance_id ) {
3153 assert(!(k == NULL && ary->_elem->isa_int()),
3154 "integral arrays must be pre-equipped with a class");
3155 if (!xk) xk = ary->ary_must_be_exact();
3156 assert(instance_id <= 0 || xk || !UseExactTypes, "instances are always exactly typed");
3157 if (!UseExactTypes) xk = (ptr == Constant);
3158 return (TypeAryPtr*)(new TypeAryPtr(ptr, NULL, ary, k, xk, offset, instance_id))->hashcons();
3159 }
3160
3161 //------------------------------make-------------------------------------------
3162 const TypeAryPtr *TypeAryPtr::make( PTR ptr, ciObject* o, const TypeAry *ary, ciKlass* k, bool xk, int offset, int instance_id ) {
3163 assert(!(k == NULL && ary->_elem->isa_int()),
3164 "integral arrays must be pre-equipped with a class");
3165 assert( (ptr==Constant && o) || (ptr!=Constant && !o), "" );
3166 if (!xk) xk = (o != NULL) || ary->ary_must_be_exact();
3167 assert(instance_id <= 0 || xk || !UseExactTypes, "instances are always exactly typed");
3168 if (!UseExactTypes) xk = (ptr == Constant);
3169 return (TypeAryPtr*)(new TypeAryPtr(ptr, o, ary, k, xk, offset, instance_id))->hashcons();
3170 }
3171
3172 //------------------------------cast_to_ptr_type-------------------------------
3173 const Type *TypeAryPtr::cast_to_ptr_type(PTR ptr) const {
3174 if( ptr == _ptr ) return this;
3175 return make(ptr, const_oop(), _ary, klass(), klass_is_exact(), _offset, _instance_id);
3176 }
3177
3178
3179 //-----------------------------cast_to_exactness-------------------------------
3180 const Type *TypeAryPtr::cast_to_exactness(bool klass_is_exact) const {
3181 if( klass_is_exact == _klass_is_exact ) return this;
3182 if (!UseExactTypes) return this;
3183 if (_ary->ary_must_be_exact()) return this; // cannot clear xk
3184 return make(ptr(), const_oop(), _ary, klass(), klass_is_exact, _offset, _instance_id);
3185 }
3186
3187 //-----------------------------cast_to_instance_id----------------------------
3188 const TypeOopPtr *TypeAryPtr::cast_to_instance_id(int instance_id) const {
3189 if( instance_id == _instance_id ) return this;
3190 return make(_ptr, const_oop(), _ary, klass(), _klass_is_exact, _offset, instance_id);
3191 }
3192
3193 //-----------------------------narrow_size_type-------------------------------
3194 // Local cache for arrayOopDesc::max_array_length(etype),
3195 // which is kind of slow (and cached elsewhere by other users).
3196 static jint max_array_length_cache[T_CONFLICT+1];
3197 static jint max_array_length(BasicType etype) {
3198 jint& cache = max_array_length_cache[etype];
3199 jint res = cache;
3200 if (res == 0) {
3201 switch (etype) {
3202 case T_NARROWOOP:
3203 etype = T_OBJECT;
3204 break;
3205 case T_CONFLICT:
3206 case T_ILLEGAL:
3207 case T_VOID:
3208 etype = T_BYTE; // will produce conservatively high value
3209 }
3210 cache = res = arrayOopDesc::max_array_length(etype);
3211 }
3212 return res;
3213 }
3214
3215 // Narrow the given size type to the index range for the given array base type.
3216 // Return NULL if the resulting int type becomes empty.
3217 const TypeInt* TypeAryPtr::narrow_size_type(const TypeInt* size) const {
3218 jint hi = size->_hi;
3219 jint lo = size->_lo;
3220 jint min_lo = 0;
3221 jint max_hi = max_array_length(elem()->basic_type());
3222 //if (index_not_size) --max_hi; // type of a valid array index, FTR
3223 bool chg = false;
3224 if (lo < min_lo) { lo = min_lo; chg = true; }
3225 if (hi > max_hi) { hi = max_hi; chg = true; }
3226 // Negative length arrays will produce weird intermediate dead fast-path code
3227 if (lo > hi)
3228 return TypeInt::ZERO;
3229 if (!chg)
3230 return size;
3231 return TypeInt::make(lo, hi, Type::WidenMin);
3232 }
3233
3234 //-------------------------------cast_to_size----------------------------------
3235 const TypeAryPtr* TypeAryPtr::cast_to_size(const TypeInt* new_size) const {
3236 assert(new_size != NULL, "");
3237 new_size = narrow_size_type(new_size);
3238 if (new_size == size()) return this;
3239 const TypeAry* new_ary = TypeAry::make(elem(), new_size);
3240 return make(ptr(), const_oop(), new_ary, klass(), klass_is_exact(), _offset, _instance_id);
3241 }
3242
3243
3244 //------------------------------eq---------------------------------------------
3245 // Structural equality check for Type representations
3246 bool TypeAryPtr::eq( const Type *t ) const {
3247 const TypeAryPtr *p = t->is_aryptr();
3248 return
3249 _ary == p->_ary && // Check array
3250 TypeOopPtr::eq(p); // Check sub-parts
3251 }
3252
3253 //------------------------------hash-------------------------------------------
3254 // Type-specific hashing function.
3255 int TypeAryPtr::hash(void) const {
3256 return (intptr_t)_ary + TypeOopPtr::hash();
3257 }
3258
3259 //------------------------------meet-------------------------------------------
3260 // Compute the MEET of two types. It returns a new Type object.
3261 const Type *TypeAryPtr::xmeet( const Type *t ) const {
3262 // Perform a fast test for common case; meeting the same types together.
3263 if( this == t ) return this; // Meeting same type-rep?
3264 // Current "this->_base" is Pointer
3265 switch (t->base()) { // switch on original type
3266
3267 // Mixing ints & oops happens when javac reuses local variables
3268 case Int:
3269 case Long:
3270 case FloatTop:
3271 case FloatCon:
3272 case FloatBot:
3273 case DoubleTop:
3274 case DoubleCon:
3275 case DoubleBot:
3276 case NarrowOop:
3277 case Bottom: // Ye Olde Default
3278 return Type::BOTTOM;
3279 case Top:
3280 return this;
3281
3282 default: // All else is a mistake
3283 typerr(t);
3284
3285 case OopPtr: { // Meeting to OopPtrs
3286 // Found a OopPtr type vs self-AryPtr type
3287 const TypeOopPtr *tp = t->is_oopptr();
3288 int offset = meet_offset(tp->offset());
3289 PTR ptr = meet_ptr(tp->ptr());
3290 switch (tp->ptr()) {
3291 case TopPTR:
3292 case AnyNull: {
3293 int instance_id = meet_instance_id(InstanceTop);
3294 return make(ptr, (ptr == Constant ? const_oop() : NULL),
3295 _ary, _klass, _klass_is_exact, offset, instance_id);
3296 }
3297 case BotPTR:
3298 case NotNull: {
3299 int instance_id = meet_instance_id(tp->instance_id());
3300 return TypeOopPtr::make(ptr, offset, instance_id);
3301 }
3302 default: ShouldNotReachHere();
3303 }
3304 }
3305
3306 case AnyPtr: { // Meeting two AnyPtrs
3307 // Found an AnyPtr type vs self-AryPtr type
3308 const TypePtr *tp = t->is_ptr();
3309 int offset = meet_offset(tp->offset());
3310 PTR ptr = meet_ptr(tp->ptr());
3311 switch (tp->ptr()) {
3312 case TopPTR:
3313 return this;
3314 case BotPTR:
3315 case NotNull:
3316 return TypePtr::make(AnyPtr, ptr, offset);
3317 case Null:
3318 if( ptr == Null ) return TypePtr::make(AnyPtr, ptr, offset);
3319 // else fall through to AnyNull
3320 case AnyNull: {
3321 int instance_id = meet_instance_id(InstanceTop);
3322 return make( ptr, (ptr == Constant ? const_oop() : NULL),
3323 _ary, _klass, _klass_is_exact, offset, instance_id);
3324 }
3325 default: ShouldNotReachHere();
3326 }
3327 }
3328
3329 case RawPtr: return TypePtr::BOTTOM;
3330
3331 case AryPtr: { // Meeting 2 references?
3332 const TypeAryPtr *tap = t->is_aryptr();
3333 int off = meet_offset(tap->offset());
3334 const TypeAry *tary = _ary->meet(tap->_ary)->is_ary();
3335 PTR ptr = meet_ptr(tap->ptr());
3336 int instance_id = meet_instance_id(tap->instance_id());
3337 ciKlass* lazy_klass = NULL;
3338 if (tary->_elem->isa_int()) {
3339 // Integral array element types have irrelevant lattice relations.
3340 // It is the klass that determines array layout, not the element type.
3341 if (_klass == NULL)
3342 lazy_klass = tap->_klass;
3343 else if (tap->_klass == NULL || tap->_klass == _klass) {
3344 lazy_klass = _klass;
3345 } else {
3346 // Something like byte[int+] meets char[int+].
3347 // This must fall to bottom, not (int[-128..65535])[int+].
3348 instance_id = InstanceBot;
3349 tary = TypeAry::make(Type::BOTTOM, tary->_size);
3350 }
3351 }
3352 bool xk;
3353 switch (tap->ptr()) {
3354 case AnyNull:
3355 case TopPTR:
3356 // Compute new klass on demand, do not use tap->_klass
3357 xk = (tap->_klass_is_exact | this->_klass_is_exact);
3358 return make( ptr, const_oop(), tary, lazy_klass, xk, off, instance_id );
3359 case Constant: {
3360 ciObject* o = const_oop();
3361 if( _ptr == Constant ) {
3362 if( tap->const_oop() != NULL && !o->equals(tap->const_oop()) ) {
3363 xk = (klass() == tap->klass());
3364 ptr = NotNull;
3365 o = NULL;
3366 instance_id = InstanceBot;
3367 } else {
3368 xk = true;
3369 }
3370 } else if( above_centerline(_ptr) ) {
3371 o = tap->const_oop();
3372 xk = true;
3373 } else {
3374 xk = this->_klass_is_exact;
3375 }
3376 return TypeAryPtr::make( ptr, o, tary, tap->_klass, xk, off, instance_id );
3377 }
3378 case NotNull:
3379 case BotPTR:
3380 // Compute new klass on demand, do not use tap->_klass
3381 if (above_centerline(this->_ptr))
3382 xk = tap->_klass_is_exact;
3383 else if (above_centerline(tap->_ptr))
3384 xk = this->_klass_is_exact;
3385 else xk = (tap->_klass_is_exact & this->_klass_is_exact) &&
3386 (klass() == tap->klass()); // Only precise for identical arrays
3387 return TypeAryPtr::make( ptr, NULL, tary, lazy_klass, xk, off, instance_id );
3388 default: ShouldNotReachHere();
3389 }
3390 }
3391
3392 // All arrays inherit from Object class
3393 case InstPtr: {
3394 const TypeInstPtr *tp = t->is_instptr();
3395 int offset = meet_offset(tp->offset());
3396 PTR ptr = meet_ptr(tp->ptr());
3397 int instance_id = meet_instance_id(tp->instance_id());
3398 switch (ptr) {
3399 case TopPTR:
3400 case AnyNull: // Fall 'down' to dual of object klass
3401 if( tp->klass()->equals(ciEnv::current()->Object_klass()) ) {
3402 return TypeAryPtr::make( ptr, _ary, _klass, _klass_is_exact, offset, instance_id );
3403 } else {
3404 // cannot subclass, so the meet has to fall badly below the centerline
3405 ptr = NotNull;
3406 instance_id = InstanceBot;
3407 return TypeInstPtr::make( ptr, ciEnv::current()->Object_klass(), false, NULL,offset, instance_id);
3408 }
3409 case Constant:
3410 case NotNull:
3411 case BotPTR: // Fall down to object klass
3412 // LCA is object_klass, but if we subclass from the top we can do better
3413 if (above_centerline(tp->ptr())) {
3414 // If 'tp' is above the centerline and it is Object class
3415 // then we can subclass in the Java class hierarchy.
3416 if( tp->klass()->equals(ciEnv::current()->Object_klass()) ) {
3417 // that is, my array type is a subtype of 'tp' klass
3418 return make( ptr, _ary, _klass, _klass_is_exact, offset, instance_id );
3419 }
3420 }
3421 // The other case cannot happen, since t cannot be a subtype of an array.
3422 // The meet falls down to Object class below centerline.
3423 if( ptr == Constant )
3424 ptr = NotNull;
3425 instance_id = InstanceBot;
3426 return TypeInstPtr::make( ptr, ciEnv::current()->Object_klass(), false, NULL,offset, instance_id);
3427 default: typerr(t);
3428 }
3429 }
3430
3431 case KlassPtr:
3432 return TypeInstPtr::BOTTOM;
3433
3434 }
3435 return this; // Lint noise
3436 }
3437
3438 //------------------------------xdual------------------------------------------
3439 // Dual: compute field-by-field dual
3440 const Type *TypeAryPtr::xdual() const {
3441 return new TypeAryPtr( dual_ptr(), _const_oop, _ary->dual()->is_ary(),_klass, _klass_is_exact, dual_offset(), dual_instance_id() );
3442 }
3443
3444 //----------------------interface_vs_oop---------------------------------------
3445 #ifdef ASSERT
3446 bool TypeAryPtr::interface_vs_oop(const Type *t) const {
3447 const TypeAryPtr* t_aryptr = t->isa_aryptr();
3448 if (t_aryptr) {
3449 return _ary->interface_vs_oop(t_aryptr->_ary);
3450 }
3451 return false;
3452 }
3453 #endif
3454
3455 //------------------------------dump2------------------------------------------
3456 #ifndef PRODUCT
3457 void TypeAryPtr::dump2( Dict &d, uint depth, outputStream *st ) const {
3458 _ary->dump2(d,depth,st);
3459 switch( _ptr ) {
3460 case Constant:
3461 const_oop()->print(st);
3462 break;
3463 case BotPTR:
3464 if (!WizardMode && !Verbose) {
3465 if( _klass_is_exact ) st->print(":exact");
3466 break;
3467 }
3468 case TopPTR:
3469 case AnyNull:
3470 case NotNull:
3471 st->print(":%s", ptr_msg[_ptr]);
3472 if( _klass_is_exact ) st->print(":exact");
3473 break;
3474 }
3475
3476 if( _offset != 0 ) {
3477 int header_size = objArrayOopDesc::header_size() * wordSize;
3478 if( _offset == OffsetTop ) st->print("+undefined");
3479 else if( _offset == OffsetBot ) st->print("+any");
3480 else if( _offset < header_size ) st->print("+%d", _offset);
3481 else {
3482 BasicType basic_elem_type = elem()->basic_type();
3483 int array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
3484 int elem_size = type2aelembytes(basic_elem_type);
3485 st->print("[%d]", (_offset - array_base)/elem_size);
3486 }
3487 }
3488 st->print(" *");
3489 if (_instance_id == InstanceTop)
3490 st->print(",iid=top");
3491 else if (_instance_id != InstanceBot)
3492 st->print(",iid=%d",_instance_id);
3493 }
3494 #endif
3495
3496 bool TypeAryPtr::empty(void) const {
3497 if (_ary->empty()) return true;
3498 return TypeOopPtr::empty();
3499 }
3500
3501 //------------------------------add_offset-------------------------------------
3502 const TypePtr *TypeAryPtr::add_offset( intptr_t offset ) const {
3503 return make( _ptr, _const_oop, _ary, _klass, _klass_is_exact, xadd_offset(offset), _instance_id );
3504 }
3505
3506
3507 //=============================================================================
3508 const TypeNarrowOop *TypeNarrowOop::BOTTOM;
3509 const TypeNarrowOop *TypeNarrowOop::NULL_PTR;
3510
3511
3512 const TypeNarrowOop* TypeNarrowOop::make(const TypePtr* type) {
3513 return (const TypeNarrowOop*)(new TypeNarrowOop(type))->hashcons();
3514 }
3515
3516 //------------------------------hash-------------------------------------------
3517 // Type-specific hashing function.
3518 int TypeNarrowOop::hash(void) const {
3519 return _ptrtype->hash() + 7;
3520 }
3521
3522
3523 bool TypeNarrowOop::eq( const Type *t ) const {
3524 const TypeNarrowOop* tc = t->isa_narrowoop();
3525 if (tc != NULL) {
3526 if (_ptrtype->base() != tc->_ptrtype->base()) {
3527 return false;
3528 }
3529 return tc->_ptrtype->eq(_ptrtype);
3530 }
3531 return false;
3532 }
3533
3534 bool TypeNarrowOop::singleton(void) const { // TRUE if type is a singleton
3535 return _ptrtype->singleton();
3536 }
3537
3538 bool TypeNarrowOop::empty(void) const {
3539 return _ptrtype->empty();
3540 }
3541
3542 //------------------------------xmeet------------------------------------------
3543 // Compute the MEET of two types. It returns a new Type object.
3544 const Type *TypeNarrowOop::xmeet( const Type *t ) const {
3545 // Perform a fast test for common case; meeting the same types together.
3546 if( this == t ) return this; // Meeting same type-rep?
3547
3548
3549 // Current "this->_base" is OopPtr
3550 switch (t->base()) { // switch on original type
3551
3552 case Int: // Mixing ints & oops happens when javac
3553 case Long: // reuses local variables
3554 case FloatTop:
3555 case FloatCon:
3556 case FloatBot:
3557 case DoubleTop:
3558 case DoubleCon:
3559 case DoubleBot:
3560 case AnyPtr:
3561 case RawPtr:
3562 case OopPtr:
3563 case InstPtr:
3564 case KlassPtr:
3565 case AryPtr:
3566
3567 case Bottom: // Ye Olde Default
3568 return Type::BOTTOM;
3569 case Top:
3570 return this;
3571
3572 case NarrowOop: {
3573 const Type* result = _ptrtype->xmeet(t->make_ptr());
3574 if (result->isa_ptr()) {
3575 return TypeNarrowOop::make(result->is_ptr());
3576 }
3577 return result;
3578 }
3579
3580 default: // All else is a mistake
3581 typerr(t);
3582
3583 } // End of switch
3584
3585 return this;
3586 }
3587
3588 const Type *TypeNarrowOop::xdual() const { // Compute dual right now.
3589 const TypePtr* odual = _ptrtype->dual()->is_ptr();
3590 return new TypeNarrowOop(odual);
3591 }
3592
3593 const Type *TypeNarrowOop::filter( const Type *kills ) const {
3594 if (kills->isa_narrowoop()) {
3595 const Type* ft =_ptrtype->filter(kills->is_narrowoop()->_ptrtype);
3596 if (ft->empty())
3597 return Type::TOP; // Canonical empty value
3598 if (ft->isa_ptr()) {
3599 return make(ft->isa_ptr());
3600 }
3601 return ft;
3602 } else if (kills->isa_ptr()) {
3603 const Type* ft = _ptrtype->join(kills);
3604 if (ft->empty())
3605 return Type::TOP; // Canonical empty value
3606 return ft;
3607 } else {
3608 return Type::TOP;
3609 }
3610 }
3611
3612
3613 intptr_t TypeNarrowOop::get_con() const {
3614 return _ptrtype->get_con();
3615 }
3616
3617 #ifndef PRODUCT
3618 void TypeNarrowOop::dump2( Dict & d, uint depth, outputStream *st ) const {
3619 st->print("narrowoop: ");
3620 _ptrtype->dump2(d, depth, st);
3621 }
3622 #endif
3623
3624
3625 //=============================================================================
3626 // Convenience common pre-built types.
3627
3628 // Not-null object klass or below
3629 const TypeKlassPtr *TypeKlassPtr::OBJECT;
3630 const TypeKlassPtr *TypeKlassPtr::OBJECT_OR_NULL;
3631
3632 //------------------------------TypeKlasPtr------------------------------------
3633 TypeKlassPtr::TypeKlassPtr( PTR ptr, ciKlass* klass, int offset )
3634 : TypeOopPtr(KlassPtr, ptr, klass, (ptr==Constant), (ptr==Constant ? klass : NULL), offset, 0) {
3635 }
3636
3637 //------------------------------make-------------------------------------------
3638 // ptr to klass 'k', if Constant, or possibly to a sub-klass if not a Constant
3639 const TypeKlassPtr *TypeKlassPtr::make( PTR ptr, ciKlass* k, int offset ) {
3640 assert( k != NULL, "Expect a non-NULL klass");
3641 assert(k->is_instance_klass() || k->is_array_klass() ||
3642 k->is_method_klass(), "Incorrect type of klass oop");
3643 TypeKlassPtr *r =
3644 (TypeKlassPtr*)(new TypeKlassPtr(ptr, k, offset))->hashcons();
3645
3646 return r;
3647 }
3648
3649 //------------------------------eq---------------------------------------------
3650 // Structural equality check for Type representations
3651 bool TypeKlassPtr::eq( const Type *t ) const {
3652 const TypeKlassPtr *p = t->is_klassptr();
3653 return
3654 klass()->equals(p->klass()) &&
3655 TypeOopPtr::eq(p);
3656 }
3657
3658 //------------------------------hash-------------------------------------------
3659 // Type-specific hashing function.
3660 int TypeKlassPtr::hash(void) const {
3661 return klass()->hash() + TypeOopPtr::hash();
3662 }
3663
3664
3665 //------------------------------klass------------------------------------------
3666 // Return the defining klass for this class
3667 ciKlass* TypeAryPtr::klass() const {
3668 if( _klass ) return _klass; // Return cached value, if possible
3669
3670 // Oops, need to compute _klass and cache it
3671 ciKlass* k_ary = NULL;
3672 const TypeInstPtr *tinst;
3673 const TypeAryPtr *tary;
3674 const Type* el = elem();
3675 if (el->isa_narrowoop()) {
3676 el = el->make_ptr();
3677 }
3678
3679 // Get element klass
3680 if ((tinst = el->isa_instptr()) != NULL) {
3681 // Compute array klass from element klass
3682 k_ary = ciObjArrayKlass::make(tinst->klass());
3683 } else if ((tary = el->isa_aryptr()) != NULL) {
3684 // Compute array klass from element klass
3685 ciKlass* k_elem = tary->klass();
3686 // If element type is something like bottom[], k_elem will be null.
3687 if (k_elem != NULL)
3688 k_ary = ciObjArrayKlass::make(k_elem);
3689 } else if ((el->base() == Type::Top) ||
3690 (el->base() == Type::Bottom)) {
3691 // element type of Bottom occurs from meet of basic type
3692 // and object; Top occurs when doing join on Bottom.
3693 // Leave k_ary at NULL.
3694 } else {
3695 // Cannot compute array klass directly from basic type,
3696 // since subtypes of TypeInt all have basic type T_INT.
3697 assert(!el->isa_int(),
3698 "integral arrays must be pre-equipped with a class");
3699 // Compute array klass directly from basic type
3700 k_ary = ciTypeArrayKlass::make(el->basic_type());
3701 }
3702
3703 if( this != TypeAryPtr::OOPS ) {
3704 // The _klass field acts as a cache of the underlying
3705 // ciKlass for this array type. In order to set the field,
3706 // we need to cast away const-ness.
3707 //
3708 // IMPORTANT NOTE: we *never* set the _klass field for the
3709 // type TypeAryPtr::OOPS. This Type is shared between all
3710 // active compilations. However, the ciKlass which represents
3711 // this Type is *not* shared between compilations, so caching
3712 // this value would result in fetching a dangling pointer.
3713 //
3714 // Recomputing the underlying ciKlass for each request is
3715 // a bit less efficient than caching, but calls to
3716 // TypeAryPtr::OOPS->klass() are not common enough to matter.
3717 ((TypeAryPtr*)this)->_klass = k_ary;
3718 if (UseCompressedOops && k_ary != NULL && k_ary->is_obj_array_klass() &&
3719 _offset != 0 && _offset != arrayOopDesc::length_offset_in_bytes()) {
3720 ((TypeAryPtr*)this)->_is_ptr_to_narrowoop = true;
3721 }
3722 }
3723 return k_ary;
3724 }
3725
3726
3727 //------------------------------add_offset-------------------------------------
3728 // Access internals of klass object
3729 const TypePtr *TypeKlassPtr::add_offset( intptr_t offset ) const {
3730 return make( _ptr, klass(), xadd_offset(offset) );
3731 }
3732
3733 //------------------------------cast_to_ptr_type-------------------------------
3734 const Type *TypeKlassPtr::cast_to_ptr_type(PTR ptr) const {
3735 assert(_base == KlassPtr, "subclass must override cast_to_ptr_type");
3736 if( ptr == _ptr ) return this;
3737 return make(ptr, _klass, _offset);
3738 }
3739
3740
3741 //-----------------------------cast_to_exactness-------------------------------
3742 const Type *TypeKlassPtr::cast_to_exactness(bool klass_is_exact) const {
3743 if( klass_is_exact == _klass_is_exact ) return this;
3744 if (!UseExactTypes) return this;
3745 return make(klass_is_exact ? Constant : NotNull, _klass, _offset);
3746 }
3747
3748
3749 //-----------------------------as_instance_type--------------------------------
3750 // Corresponding type for an instance of the given class.
3751 // It will be NotNull, and exact if and only if the klass type is exact.
3752 const TypeOopPtr* TypeKlassPtr::as_instance_type() const {
3753 ciKlass* k = klass();
3754 bool xk = klass_is_exact();
3755 //return TypeInstPtr::make(TypePtr::NotNull, k, xk, NULL, 0);
3756 const TypeOopPtr* toop = TypeOopPtr::make_from_klass_raw(k);
3757 toop = toop->cast_to_ptr_type(TypePtr::NotNull)->is_oopptr();
3758 return toop->cast_to_exactness(xk)->is_oopptr();
3759 }
3760
3761
3762 //------------------------------xmeet------------------------------------------
3763 // Compute the MEET of two types, return a new Type object.
3764 const Type *TypeKlassPtr::xmeet( const Type *t ) const {
3765 // Perform a fast test for common case; meeting the same types together.
3766 if( this == t ) return this; // Meeting same type-rep?
3767
3768 // Current "this->_base" is Pointer
3769 switch (t->base()) { // switch on original type
3770
3771 case Int: // Mixing ints & oops happens when javac
3772 case Long: // reuses local variables
3773 case FloatTop:
3774 case FloatCon:
3775 case FloatBot:
3776 case DoubleTop:
3777 case DoubleCon:
3778 case DoubleBot:
3779 case NarrowOop:
3780 case Bottom: // Ye Olde Default
3781 return Type::BOTTOM;
3782 case Top:
3783 return this;
3784
3785 default: // All else is a mistake
3786 typerr(t);
3787
3788 case RawPtr: return TypePtr::BOTTOM;
3789
3790 case OopPtr: { // Meeting to OopPtrs
3791 // Found a OopPtr type vs self-KlassPtr type
3792 const TypePtr *tp = t->is_oopptr();
3793 int offset = meet_offset(tp->offset());
3794 PTR ptr = meet_ptr(tp->ptr());
3795 switch (tp->ptr()) {
3796 case TopPTR:
3797 case AnyNull:
3798 return make(ptr, klass(), offset);
3799 case BotPTR:
3800 case NotNull:
3801 return TypePtr::make(AnyPtr, ptr, offset);
3802 default: typerr(t);
3803 }
3804 }
3805
3806 case AnyPtr: { // Meeting to AnyPtrs
3807 // Found an AnyPtr type vs self-KlassPtr type
3808 const TypePtr *tp = t->is_ptr();
3809 int offset = meet_offset(tp->offset());
3810 PTR ptr = meet_ptr(tp->ptr());
3811 switch (tp->ptr()) {
3812 case TopPTR:
3813 return this;
3814 case Null:
3815 if( ptr == Null ) return TypePtr::make( AnyPtr, ptr, offset );
3816 case AnyNull:
3817 return make( ptr, klass(), offset );
3818 case BotPTR:
3819 case NotNull:
3820 return TypePtr::make(AnyPtr, ptr, offset);
3821 default: typerr(t);
3822 }
3823 }
3824
3825 case AryPtr: // Meet with AryPtr
3826 case InstPtr: // Meet with InstPtr
3827 return TypeInstPtr::BOTTOM;
3828
3829 //
3830 // A-top }
3831 // / | \ } Tops
3832 // B-top A-any C-top }
3833 // | / | \ | } Any-nulls
3834 // B-any | C-any }
3835 // | | |
3836 // B-con A-con C-con } constants; not comparable across classes
3837 // | | |
3838 // B-not | C-not }
3839 // | \ | / | } not-nulls
3840 // B-bot A-not C-bot }
3841 // \ | / } Bottoms
3842 // A-bot }
3843 //
3844
3845 case KlassPtr: { // Meet two KlassPtr types
3846 const TypeKlassPtr *tkls = t->is_klassptr();
3847 int off = meet_offset(tkls->offset());
3848 PTR ptr = meet_ptr(tkls->ptr());
3849
3850 // Check for easy case; klasses are equal (and perhaps not loaded!)
3851 // If we have constants, then we created oops so classes are loaded
3852 // and we can handle the constants further down. This case handles
3853 // not-loaded classes
3854 if( ptr != Constant && tkls->klass()->equals(klass()) ) {
3855 return make( ptr, klass(), off );
3856 }
3857
3858 // Classes require inspection in the Java klass hierarchy. Must be loaded.
3859 ciKlass* tkls_klass = tkls->klass();
3860 ciKlass* this_klass = this->klass();
3861 assert( tkls_klass->is_loaded(), "This class should have been loaded.");
3862 assert( this_klass->is_loaded(), "This class should have been loaded.");
3863
3864 // If 'this' type is above the centerline and is a superclass of the
3865 // other, we can treat 'this' as having the same type as the other.
3866 if ((above_centerline(this->ptr())) &&
3867 tkls_klass->is_subtype_of(this_klass)) {
3868 this_klass = tkls_klass;
3869 }
3870 // If 'tinst' type is above the centerline and is a superclass of the
3871 // other, we can treat 'tinst' as having the same type as the other.
3872 if ((above_centerline(tkls->ptr())) &&
3873 this_klass->is_subtype_of(tkls_klass)) {
3874 tkls_klass = this_klass;
3875 }
3876
3877 // Check for classes now being equal
3878 if (tkls_klass->equals(this_klass)) {
3879 // If the klasses are equal, the constants may still differ. Fall to
3880 // NotNull if they do (neither constant is NULL; that is a special case
3881 // handled elsewhere).
3882 ciObject* o = NULL; // Assume not constant when done
3883 ciObject* this_oop = const_oop();
3884 ciObject* tkls_oop = tkls->const_oop();
3885 if( ptr == Constant ) {
3886 if (this_oop != NULL && tkls_oop != NULL &&
3887 this_oop->equals(tkls_oop) )
3888 o = this_oop;
3889 else if (above_centerline(this->ptr()))
3890 o = tkls_oop;
3891 else if (above_centerline(tkls->ptr()))
3892 o = this_oop;
3893 else
3894 ptr = NotNull;
3895 }
3896 return make( ptr, this_klass, off );
3897 } // Else classes are not equal
3898
3899 // Since klasses are different, we require the LCA in the Java
3900 // class hierarchy - which means we have to fall to at least NotNull.
3901 if( ptr == TopPTR || ptr == AnyNull || ptr == Constant )
3902 ptr = NotNull;
3903 // Now we find the LCA of Java classes
3904 ciKlass* k = this_klass->least_common_ancestor(tkls_klass);
3905 return make( ptr, k, off );
3906 } // End of case KlassPtr
3907
3908 } // End of switch
3909 return this; // Return the double constant
3910 }
3911
3912 //------------------------------xdual------------------------------------------
3913 // Dual: compute field-by-field dual
3914 const Type *TypeKlassPtr::xdual() const {
3915 return new TypeKlassPtr( dual_ptr(), klass(), dual_offset() );
3916 }
3917
3918 //------------------------------dump2------------------------------------------
3919 // Dump Klass Type
3920 #ifndef PRODUCT
3921 void TypeKlassPtr::dump2( Dict & d, uint depth, outputStream *st ) const {
3922 switch( _ptr ) {
3923 case Constant:
3924 st->print("precise ");
3925 case NotNull:
3926 {
3927 const char *name = klass()->name()->as_utf8();
3928 if( name ) {
3929 st->print("klass %s: " INTPTR_FORMAT, name, klass());
3930 } else {
3931 ShouldNotReachHere();
3932 }
3933 }
3934 case BotPTR:
3935 if( !WizardMode && !Verbose && !_klass_is_exact ) break;
3936 case TopPTR:
3937 case AnyNull:
3938 st->print(":%s", ptr_msg[_ptr]);
3939 if( _klass_is_exact ) st->print(":exact");
3940 break;
3941 }
3942
3943 if( _offset ) { // Dump offset, if any
3944 if( _offset == OffsetBot ) { st->print("+any"); }
3945 else if( _offset == OffsetTop ) { st->print("+unknown"); }
3946 else { st->print("+%d", _offset); }
3947 }
3948
3949 st->print(" *");
3950 }
3951 #endif
3952
3953
3954
3955 //=============================================================================
3956 // Convenience common pre-built types.
3957
3958 //------------------------------make-------------------------------------------
3959 const TypeFunc *TypeFunc::make( const TypeTuple *domain, const TypeTuple *range ) {
3960 return (TypeFunc*)(new TypeFunc(domain,range))->hashcons();
3961 }
3962
3963 //------------------------------make-------------------------------------------
3964 const TypeFunc *TypeFunc::make(ciMethod* method) {
3965 Compile* C = Compile::current();
3966 const TypeFunc* tf = C->last_tf(method); // check cache
3967 if (tf != NULL) return tf; // The hit rate here is almost 50%.
3968 const TypeTuple *domain;
3969 if (method->is_static()) {
3970 domain = TypeTuple::make_domain(NULL, method->signature());
3971 } else {
3972 domain = TypeTuple::make_domain(method->holder(), method->signature());
3973 }
3974 const TypeTuple *range = TypeTuple::make_range(method->signature());
3975 tf = TypeFunc::make(domain, range);
3976 C->set_last_tf(method, tf); // fill cache
3977 return tf;
3978 }
3979
3980 //------------------------------meet-------------------------------------------
3981 // Compute the MEET of two types. It returns a new Type object.
3982 const Type *TypeFunc::xmeet( const Type *t ) const {
3983 // Perform a fast test for common case; meeting the same types together.
3984 if( this == t ) return this; // Meeting same type-rep?
3985
3986 // Current "this->_base" is Func
3987 switch (t->base()) { // switch on original type
3988
3989 case Bottom: // Ye Olde Default
3990 return t;
3991
3992 default: // All else is a mistake
3993 typerr(t);
3994
3995 case Top:
3996 break;
3997 }
3998 return this; // Return the double constant
3999 }
4000
4001 //------------------------------xdual------------------------------------------
4002 // Dual: compute field-by-field dual
4003 const Type *TypeFunc::xdual() const {
4004 return this;
4005 }
4006
4007 //------------------------------eq---------------------------------------------
4008 // Structural equality check for Type representations
4009 bool TypeFunc::eq( const Type *t ) const {
4010 const TypeFunc *a = (const TypeFunc*)t;
4011 return _domain == a->_domain &&
4012 _range == a->_range;
4013 }
4014
4015 //------------------------------hash-------------------------------------------
4016 // Type-specific hashing function.
4017 int TypeFunc::hash(void) const {
4018 return (intptr_t)_domain + (intptr_t)_range;
4019 }
4020
4021 //------------------------------dump2------------------------------------------
4022 // Dump Function Type
4023 #ifndef PRODUCT
4024 void TypeFunc::dump2( Dict &d, uint depth, outputStream *st ) const {
4025 if( _range->_cnt <= Parms )
4026 st->print("void");
4027 else {
4028 uint i;
4029 for (i = Parms; i < _range->_cnt-1; i++) {
4030 _range->field_at(i)->dump2(d,depth,st);
4031 st->print("/");
4032 }
4033 _range->field_at(i)->dump2(d,depth,st);
4034 }
4035 st->print(" ");
4036 st->print("( ");
4037 if( !depth || d[this] ) { // Check for recursive dump
4038 st->print("...)");
4039 return;
4040 }
4041 d.Insert((void*)this,(void*)this); // Stop recursion
4042 if (Parms < _domain->_cnt)
4043 _domain->field_at(Parms)->dump2(d,depth-1,st);
4044 for (uint i = Parms+1; i < _domain->_cnt; i++) {
4045 st->print(", ");
4046 _domain->field_at(i)->dump2(d,depth-1,st);
4047 }
4048 st->print(" )");
4049 }
4050
4051 //------------------------------print_flattened--------------------------------
4052 // Print a 'flattened' signature
4053 static const char * const flat_type_msg[Type::lastype] = {
4054 "bad","control","top","int","long","_", "narrowoop",
4055 "tuple:", "array:",
4056 "ptr", "rawptr", "ptr", "ptr", "ptr", "ptr",
4057 "func", "abIO", "return_address", "mem",
4058 "float_top", "ftcon:", "flt",
4059 "double_top", "dblcon:", "dbl",
4060 "bottom"
4061 };
4062
4063 void TypeFunc::print_flattened() const {
4064 if( _range->_cnt <= Parms )
4065 tty->print("void");
4066 else {
4067 uint i;
4068 for (i = Parms; i < _range->_cnt-1; i++)
4069 tty->print("%s/",flat_type_msg[_range->field_at(i)->base()]);
4070 tty->print("%s",flat_type_msg[_range->field_at(i)->base()]);
4071 }
4072 tty->print(" ( ");
4073 if (Parms < _domain->_cnt)
4074 tty->print("%s",flat_type_msg[_domain->field_at(Parms)->base()]);
4075 for (uint i = Parms+1; i < _domain->_cnt; i++)
4076 tty->print(", %s",flat_type_msg[_domain->field_at(i)->base()]);
4077 tty->print(" )");
4078 }
4079 #endif
4080
4081 //------------------------------singleton--------------------------------------
4082 // TRUE if Type is a singleton type, FALSE otherwise. Singletons are simple
4083 // constants (Ldi nodes). Singletons are integer, float or double constants
4084 // or a single symbol.
4085 bool TypeFunc::singleton(void) const {
4086 return false; // Never a singleton
4087 }
4088
4089 bool TypeFunc::empty(void) const {
4090 return false; // Never empty
4091 }
4092
4093
4094 BasicType TypeFunc::return_type() const{
4095 if (range()->cnt() == TypeFunc::Parms) {
4096 return T_VOID;
4097 }
4098 return range()->field_at(TypeFunc::Parms)->basic_type();
4099 }