Mercurial > hg > truffle
annotate src/share/vm/opto/parse3.cpp @ 11239:6c098f64a7a6
added support for handling volatile registers across native runtime calls
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 07 Aug 2013 01:52:44 +0200 |
parents | fcf521c3fbc6 |
children | edb5ab0f3fe5 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "compiler/compileLog.hpp" | |
27 #include "interpreter/linkResolver.hpp" | |
28 #include "memory/universe.inline.hpp" | |
29 #include "oops/objArrayKlass.hpp" | |
30 #include "opto/addnode.hpp" | |
31 #include "opto/memnode.hpp" | |
32 #include "opto/parse.hpp" | |
33 #include "opto/rootnode.hpp" | |
34 #include "opto/runtime.hpp" | |
35 #include "opto/subnode.hpp" | |
36 #include "runtime/deoptimization.hpp" | |
37 #include "runtime/handles.inline.hpp" | |
0 | 38 |
39 //============================================================================= | |
40 // Helper methods for _get* and _put* bytecodes | |
41 //============================================================================= | |
42 bool Parse::static_field_ok_in_clinit(ciField *field, ciMethod *method) { | |
43 // Could be the field_holder's <clinit> method, or <clinit> for a subklass. | |
44 // Better to check now than to Deoptimize as soon as we execute | |
45 assert( field->is_static(), "Only check if field is static"); | |
46 // is_being_initialized() is too generous. It allows access to statics | |
47 // by threads that are not running the <clinit> before the <clinit> finishes. | |
48 // return field->holder()->is_being_initialized(); | |
49 | |
50 // The following restriction is correct but conservative. | |
51 // It is also desirable to allow compilation of methods called from <clinit> | |
52 // but this generated code will need to be made safe for execution by | |
53 // other threads, or the transition from interpreted to compiled code would | |
54 // need to be guarded. | |
55 ciInstanceKlass *field_holder = field->holder(); | |
56 | |
57 bool access_OK = false; | |
58 if (method->holder()->is_subclass_of(field_holder)) { | |
59 if (method->is_static()) { | |
60 if (method->name() == ciSymbol::class_initializer_name()) { | |
61 // OK to access static fields inside initializer | |
62 access_OK = true; | |
63 } | |
64 } else { | |
65 if (method->name() == ciSymbol::object_initializer_name()) { | |
66 // It's also OK to access static fields inside a constructor, | |
67 // because any thread calling the constructor must first have | |
68 // synchronized on the class by executing a '_new' bytecode. | |
69 access_OK = true; | |
70 } | |
71 } | |
72 } | |
73 | |
74 return access_OK; | |
75 | |
76 } | |
77 | |
78 | |
79 void Parse::do_field_access(bool is_get, bool is_field) { | |
80 bool will_link; | |
81 ciField* field = iter().get_field(will_link); | |
82 assert(will_link, "getfield: typeflow responsibility"); | |
83 | |
84 ciInstanceKlass* field_holder = field->holder(); | |
85 | |
86 if (is_field == field->is_static()) { | |
87 // Interpreter will throw java_lang_IncompatibleClassChangeError | |
88 // Check this before allowing <clinit> methods to access static fields | |
89 uncommon_trap(Deoptimization::Reason_unhandled, | |
90 Deoptimization::Action_none); | |
91 return; | |
92 } | |
93 | |
94 if (!is_field && !field_holder->is_initialized()) { | |
95 if (!static_field_ok_in_clinit(field, method())) { | |
96 uncommon_trap(Deoptimization::Reason_uninitialized, | |
97 Deoptimization::Action_reinterpret, | |
98 NULL, "!static_field_ok_in_clinit"); | |
99 return; | |
100 } | |
101 } | |
102 | |
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103 // Deoptimize on putfield writes to call site target field. |
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104 if (!is_get && field->is_call_site_target()) { |
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105 uncommon_trap(Deoptimization::Reason_unhandled, |
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106 Deoptimization::Action_reinterpret, |
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107 NULL, "put to call site target field"); |
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108 return; |
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109 } |
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110 |
0 | 111 assert(field->will_link(method()->holder(), bc()), "getfield: typeflow responsibility"); |
112 | |
113 // Note: We do not check for an unloaded field type here any more. | |
114 | |
115 // Generate code for the object pointer. | |
116 Node* obj; | |
117 if (is_field) { | |
118 int obj_depth = is_get ? 0 : field->type()->size(); | |
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119 obj = null_check(peek(obj_depth)); |
0 | 120 // Compile-time detect of null-exception? |
121 if (stopped()) return; | |
122 | |
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123 #ifdef ASSERT |
0 | 124 const TypeInstPtr *tjp = TypeInstPtr::make(TypePtr::NotNull, iter().get_declared_field_holder()); |
125 assert(_gvn.type(obj)->higher_equal(tjp), "cast_up is no longer needed"); | |
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126 #endif |
0 | 127 |
128 if (is_get) { | |
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129 (void) pop(); // pop receiver before getting |
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130 do_get_xxx(obj, field, is_field); |
0 | 131 } else { |
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132 do_put_xxx(obj, field, is_field); |
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133 (void) pop(); // pop receiver after putting |
0 | 134 } |
135 } else { | |
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136 const TypeInstPtr* tip = TypeInstPtr::make(field_holder->java_mirror()); |
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137 obj = _gvn.makecon(tip); |
0 | 138 if (is_get) { |
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139 do_get_xxx(obj, field, is_field); |
0 | 140 } else { |
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141 do_put_xxx(obj, field, is_field); |
0 | 142 } |
143 } | |
144 } | |
145 | |
146 | |
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147 void Parse::do_get_xxx(Node* obj, ciField* field, bool is_field) { |
0 | 148 // Does this field have a constant value? If so, just push the value. |
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149 if (field->is_constant()) { |
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150 // final field |
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151 if (field->is_static()) { |
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152 // final static field |
10278 | 153 if (C->eliminate_boxing()) { |
154 // The pointers in the autobox arrays are always non-null. | |
155 ciSymbol* klass_name = field->holder()->name(); | |
156 if (field->name() == ciSymbol::cache_field_name() && | |
157 field->holder()->uses_default_loader() && | |
158 (klass_name == ciSymbol::java_lang_Character_CharacterCache() || | |
159 klass_name == ciSymbol::java_lang_Byte_ByteCache() || | |
160 klass_name == ciSymbol::java_lang_Short_ShortCache() || | |
161 klass_name == ciSymbol::java_lang_Integer_IntegerCache() || | |
162 klass_name == ciSymbol::java_lang_Long_LongCache())) { | |
163 bool require_const = true; | |
164 bool autobox_cache = true; | |
165 if (push_constant(field->constant_value(), require_const, autobox_cache)) { | |
166 return; | |
167 } | |
168 } | |
169 } | |
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170 if (push_constant(field->constant_value())) |
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171 return; |
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172 } |
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173 else { |
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174 // final non-static field |
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175 // Treat final non-static fields of trusted classes (classes in |
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176 // java.lang.invoke and sun.invoke packages and subpackages) as |
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177 // compile time constants. |
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178 if (obj->is_Con()) { |
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179 const TypeOopPtr* oop_ptr = obj->bottom_type()->isa_oopptr(); |
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180 ciObject* constant_oop = oop_ptr->const_oop(); |
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181 ciConstant constant = field->constant_value_of(constant_oop); |
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182 if (push_constant(constant, true)) |
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183 return; |
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184 } |
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185 } |
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186 } |
0 | 187 |
188 ciType* field_klass = field->type(); | |
189 bool is_vol = field->is_volatile(); | |
190 | |
191 // Compute address and memory type. | |
192 int offset = field->offset_in_bytes(); | |
193 const TypePtr* adr_type = C->alias_type(field)->adr_type(); | |
194 Node *adr = basic_plus_adr(obj, obj, offset); | |
195 BasicType bt = field->layout_type(); | |
196 | |
197 // Build the resultant type of the load | |
198 const Type *type; | |
199 | |
200 bool must_assert_null = false; | |
201 | |
202 if( bt == T_OBJECT ) { | |
203 if (!field->type()->is_loaded()) { | |
204 type = TypeInstPtr::BOTTOM; | |
205 must_assert_null = true; | |
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206 } else if (field->is_constant() && field->is_static()) { |
0 | 207 // This can happen if the constant oop is non-perm. |
208 ciObject* con = field->constant_value().as_object(); | |
209 // Do not "join" in the previous type; it doesn't add value, | |
210 // and may yield a vacuous result if the field is of interface type. | |
211 type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); | |
212 assert(type != NULL, "field singleton type must be consistent"); | |
213 } else { | |
214 type = TypeOopPtr::make_from_klass(field_klass->as_klass()); | |
215 } | |
216 } else { | |
217 type = Type::get_const_basic_type(bt); | |
218 } | |
219 // Build the load. | |
220 Node* ld = make_load(NULL, adr, type, bt, adr_type, is_vol); | |
221 | |
222 // Adjust Java stack | |
223 if (type2size[bt] == 1) | |
224 push(ld); | |
225 else | |
226 push_pair(ld); | |
227 | |
228 if (must_assert_null) { | |
229 // Do not take a trap here. It's possible that the program | |
230 // will never load the field's class, and will happily see | |
231 // null values in this field forever. Don't stumble into a | |
232 // trap for such a program, or we might get a long series | |
233 // of useless recompilations. (Or, we might load a class | |
234 // which should not be loaded.) If we ever see a non-null | |
235 // value, we will then trap and recompile. (The trap will | |
236 // not need to mention the class index, since the class will | |
237 // already have been loaded if we ever see a non-null value.) | |
238 // uncommon_trap(iter().get_field_signature_index()); | |
239 #ifndef PRODUCT | |
240 if (PrintOpto && (Verbose || WizardMode)) { | |
241 method()->print_name(); tty->print_cr(" asserting nullness of field at bci: %d", bci()); | |
242 } | |
243 #endif | |
244 if (C->log() != NULL) { | |
245 C->log()->elem("assert_null reason='field' klass='%d'", | |
246 C->log()->identify(field->type())); | |
247 } | |
248 // If there is going to be a trap, put it at the next bytecode: | |
249 set_bci(iter().next_bci()); | |
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250 null_assert(peek()); |
0 | 251 set_bci(iter().cur_bci()); // put it back |
252 } | |
253 | |
254 // If reference is volatile, prevent following memory ops from | |
255 // floating up past the volatile read. Also prevents commoning | |
256 // another volatile read. | |
257 if (field->is_volatile()) { | |
258 // Memory barrier includes bogus read of value to force load BEFORE membar | |
259 insert_mem_bar(Op_MemBarAcquire, ld); | |
260 } | |
261 } | |
262 | |
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263 void Parse::do_put_xxx(Node* obj, ciField* field, bool is_field) { |
0 | 264 bool is_vol = field->is_volatile(); |
265 // If reference is volatile, prevent following memory ops from | |
266 // floating down past the volatile write. Also prevents commoning | |
267 // another volatile read. | |
268 if (is_vol) insert_mem_bar(Op_MemBarRelease); | |
269 | |
270 // Compute address and memory type. | |
271 int offset = field->offset_in_bytes(); | |
272 const TypePtr* adr_type = C->alias_type(field)->adr_type(); | |
273 Node* adr = basic_plus_adr(obj, obj, offset); | |
274 BasicType bt = field->layout_type(); | |
275 // Value to be stored | |
276 Node* val = type2size[bt] == 1 ? pop() : pop_pair(); | |
277 // Round doubles before storing | |
278 if (bt == T_DOUBLE) val = dstore_rounding(val); | |
279 | |
280 // Store the value. | |
281 Node* store; | |
282 if (bt == T_OBJECT) { | |
825 | 283 const TypeOopPtr* field_type; |
0 | 284 if (!field->type()->is_loaded()) { |
285 field_type = TypeInstPtr::BOTTOM; | |
286 } else { | |
287 field_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); | |
288 } | |
289 store = store_oop_to_object( control(), obj, adr, adr_type, val, field_type, bt); | |
290 } else { | |
291 store = store_to_memory( control(), adr, val, bt, adr_type, is_vol ); | |
292 } | |
293 | |
294 // If reference is volatile, prevent following volatiles ops from | |
295 // floating up before the volatile write. | |
296 if (is_vol) { | |
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297 insert_mem_bar(Op_MemBarVolatile); // Use fat membar |
0 | 298 } |
299 | |
300 // If the field is final, the rules of Java say we are in <init> or <clinit>. | |
301 // Note the presence of writes to final non-static fields, so that we | |
302 // can insert a memory barrier later on to keep the writes from floating | |
303 // out of the constructor. | |
304 if (is_field && field->is_final()) { | |
305 set_wrote_final(true); | |
10278 | 306 // Preserve allocation ptr to create precedent edge to it in membar |
307 // generated on exit from constructor. | |
308 if (C->eliminate_boxing() && | |
309 adr_type->isa_oopptr() && adr_type->is_oopptr()->is_ptr_to_boxed_value() && | |
310 AllocateNode::Ideal_allocation(obj, &_gvn) != NULL) { | |
311 set_alloc_with_final(obj); | |
312 } | |
0 | 313 } |
314 } | |
315 | |
316 | |
10278 | 317 bool Parse::push_constant(ciConstant constant, bool require_constant, bool is_autobox_cache) { |
0 | 318 switch (constant.basic_type()) { |
319 case T_BOOLEAN: push( intcon(constant.as_boolean()) ); break; | |
320 case T_INT: push( intcon(constant.as_int()) ); break; | |
321 case T_CHAR: push( intcon(constant.as_char()) ); break; | |
322 case T_BYTE: push( intcon(constant.as_byte()) ); break; | |
323 case T_SHORT: push( intcon(constant.as_short()) ); break; | |
324 case T_FLOAT: push( makecon(TypeF::make(constant.as_float())) ); break; | |
325 case T_DOUBLE: push_pair( makecon(TypeD::make(constant.as_double())) ); break; | |
326 case T_LONG: push_pair( longcon(constant.as_long()) ); break; | |
327 case T_ARRAY: | |
328 case T_OBJECT: { | |
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329 // cases: |
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330 // can_be_constant = (oop not scavengable || ScavengeRootsInCode != 0) |
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331 // should_be_constant = (oop not scavengable || ScavengeRootsInCode >= 2) |
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332 // An oop is not scavengable if it is in the perm gen. |
0 | 333 ciObject* oop_constant = constant.as_object(); |
334 if (oop_constant->is_null_object()) { | |
335 push( zerocon(T_OBJECT) ); | |
336 break; | |
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337 } else if (require_constant || oop_constant->should_be_constant()) { |
10278 | 338 push( makecon(TypeOopPtr::make_from_constant(oop_constant, require_constant, is_autobox_cache)) ); |
0 | 339 break; |
340 } else { | |
341 // we cannot inline the oop, but we can use it later to narrow a type | |
342 return false; | |
343 } | |
344 } | |
345 case T_ILLEGAL: { | |
346 // Invalid ciConstant returned due to OutOfMemoryError in the CI | |
347 assert(C->env()->failing(), "otherwise should not see this"); | |
348 // These always occur because of object types; we are going to | |
349 // bail out anyway, so make the stack depths match up | |
350 push( zerocon(T_OBJECT) ); | |
351 return false; | |
352 } | |
353 default: | |
354 ShouldNotReachHere(); | |
355 return false; | |
356 } | |
357 | |
358 // success | |
359 return true; | |
360 } | |
361 | |
362 | |
363 | |
364 //============================================================================= | |
365 void Parse::do_anewarray() { | |
366 bool will_link; | |
367 ciKlass* klass = iter().get_klass(will_link); | |
368 | |
369 // Uncommon Trap when class that array contains is not loaded | |
370 // we need the loaded class for the rest of graph; do not | |
371 // initialize the container class (see Java spec)!!! | |
372 assert(will_link, "anewarray: typeflow responsibility"); | |
373 | |
374 ciObjArrayKlass* array_klass = ciObjArrayKlass::make(klass); | |
375 // Check that array_klass object is loaded | |
376 if (!array_klass->is_loaded()) { | |
377 // Generate uncommon_trap for unloaded array_class | |
378 uncommon_trap(Deoptimization::Reason_unloaded, | |
379 Deoptimization::Action_reinterpret, | |
380 array_klass); | |
381 return; | |
382 } | |
383 | |
384 kill_dead_locals(); | |
385 | |
386 const TypeKlassPtr* array_klass_type = TypeKlassPtr::make(array_klass); | |
387 Node* count_val = pop(); | |
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388 Node* obj = new_array(makecon(array_klass_type), count_val, 1); |
0 | 389 push(obj); |
390 } | |
391 | |
392 | |
393 void Parse::do_newarray(BasicType elem_type) { | |
394 kill_dead_locals(); | |
395 | |
396 Node* count_val = pop(); | |
397 const TypeKlassPtr* array_klass = TypeKlassPtr::make(ciTypeArrayKlass::make(elem_type)); | |
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398 Node* obj = new_array(makecon(array_klass), count_val, 1); |
0 | 399 // Push resultant oop onto stack |
400 push(obj); | |
401 } | |
402 | |
403 // Expand simple expressions like new int[3][5] and new Object[2][nonConLen]. | |
404 // Also handle the degenerate 1-dimensional case of anewarray. | |
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405 Node* Parse::expand_multianewarray(ciArrayKlass* array_klass, Node* *lengths, int ndimensions, int nargs) { |
0 | 406 Node* length = lengths[0]; |
407 assert(length != NULL, ""); | |
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408 Node* array = new_array(makecon(TypeKlassPtr::make(array_klass)), length, nargs); |
0 | 409 if (ndimensions > 1) { |
410 jint length_con = find_int_con(length, -1); | |
411 guarantee(length_con >= 0, "non-constant multianewarray"); | |
412 ciArrayKlass* array_klass_1 = array_klass->as_obj_array_klass()->element_klass()->as_array_klass(); | |
413 const TypePtr* adr_type = TypeAryPtr::OOPS; | |
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414 const TypeOopPtr* elemtype = _gvn.type(array)->is_aryptr()->elem()->make_oopptr(); |
0 | 415 const intptr_t header = arrayOopDesc::base_offset_in_bytes(T_OBJECT); |
416 for (jint i = 0; i < length_con; i++) { | |
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417 Node* elem = expand_multianewarray(array_klass_1, &lengths[1], ndimensions-1, nargs); |
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418 intptr_t offset = header + ((intptr_t)i << LogBytesPerHeapOop); |
0 | 419 Node* eaddr = basic_plus_adr(array, offset); |
420 store_oop_to_array(control(), array, eaddr, adr_type, elem, elemtype, T_OBJECT); | |
421 } | |
422 } | |
423 return array; | |
424 } | |
425 | |
426 void Parse::do_multianewarray() { | |
427 int ndimensions = iter().get_dimensions(); | |
428 | |
429 // the m-dimensional array | |
430 bool will_link; | |
431 ciArrayKlass* array_klass = iter().get_klass(will_link)->as_array_klass(); | |
432 assert(will_link, "multianewarray: typeflow responsibility"); | |
433 | |
434 // Note: Array classes are always initialized; no is_initialized check. | |
435 | |
436 kill_dead_locals(); | |
437 | |
438 // get the lengths from the stack (first dimension is on top) | |
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439 Node** length = NEW_RESOURCE_ARRAY(Node*, ndimensions + 1); |
0 | 440 length[ndimensions] = NULL; // terminating null for make_runtime_call |
441 int j; | |
442 for (j = ndimensions-1; j >= 0 ; j--) length[j] = pop(); | |
443 | |
444 // The original expression was of this form: new T[length0][length1]... | |
445 // It is often the case that the lengths are small (except the last). | |
446 // If that happens, use the fast 1-d creator a constant number of times. | |
447 const jint expand_limit = MIN2((juint)MultiArrayExpandLimit, (juint)100); | |
448 jint expand_count = 1; // count of allocations in the expansion | |
449 jint expand_fanout = 1; // running total fanout | |
450 for (j = 0; j < ndimensions-1; j++) { | |
451 jint dim_con = find_int_con(length[j], -1); | |
452 expand_fanout *= dim_con; | |
453 expand_count += expand_fanout; // count the level-J sub-arrays | |
106 | 454 if (dim_con <= 0 |
0 | 455 || dim_con > expand_limit |
456 || expand_count > expand_limit) { | |
457 expand_count = 0; | |
458 break; | |
459 } | |
460 } | |
461 | |
462 // Can use multianewarray instead of [a]newarray if only one dimension, | |
463 // or if all non-final dimensions are small constants. | |
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464 if (ndimensions == 1 || (1 <= expand_count && expand_count <= expand_limit)) { |
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465 Node* obj = NULL; |
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466 // Set the original stack and the reexecute bit for the interpreter |
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467 // to reexecute the multianewarray bytecode if deoptimization happens. |
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468 // Do it unconditionally even for one dimension multianewarray. |
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469 // Note: the reexecute bit will be set in GraphKit::add_safepoint_edges() |
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470 // when AllocateArray node for newarray is created. |
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471 { PreserveReexecuteState preexecs(this); |
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472 inc_sp(ndimensions); |
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473 // Pass 0 as nargs since uncommon trap code does not need to restore stack. |
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474 obj = expand_multianewarray(array_klass, &length[0], ndimensions, 0); |
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475 } //original reexecute and sp are set back here |
0 | 476 push(obj); |
477 return; | |
478 } | |
479 | |
480 address fun = NULL; | |
481 switch (ndimensions) { | |
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482 case 1: ShouldNotReachHere(); break; |
0 | 483 case 2: fun = OptoRuntime::multianewarray2_Java(); break; |
484 case 3: fun = OptoRuntime::multianewarray3_Java(); break; | |
485 case 4: fun = OptoRuntime::multianewarray4_Java(); break; | |
486 case 5: fun = OptoRuntime::multianewarray5_Java(); break; | |
487 }; | |
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488 Node* c = NULL; |
0 | 489 |
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490 if (fun != NULL) { |
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491 c = make_runtime_call(RC_NO_LEAF | RC_NO_IO, |
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492 OptoRuntime::multianewarray_Type(ndimensions), |
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493 fun, NULL, TypeRawPtr::BOTTOM, |
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494 makecon(TypeKlassPtr::make(array_klass)), |
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495 length[0], length[1], length[2], |
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496 (ndimensions > 2) ? length[3] : NULL, |
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497 (ndimensions > 3) ? length[4] : NULL); |
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498 } else { |
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499 // Create a java array for dimension sizes |
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500 Node* dims = NULL; |
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501 { PreserveReexecuteState preexecs(this); |
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502 inc_sp(ndimensions); |
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503 Node* dims_array_klass = makecon(TypeKlassPtr::make(ciArrayKlass::make(ciType::make(T_INT)))); |
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504 dims = new_array(dims_array_klass, intcon(ndimensions), 0); |
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505 |
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506 // Fill-in it with values |
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507 for (j = 0; j < ndimensions; j++) { |
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508 Node *dims_elem = array_element_address(dims, intcon(j), T_INT); |
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509 store_to_memory(control(), dims_elem, length[j], T_INT, TypeAryPtr::INTS); |
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510 } |
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511 } |
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512 |
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513 c = make_runtime_call(RC_NO_LEAF | RC_NO_IO, |
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514 OptoRuntime::multianewarrayN_Type(), |
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515 OptoRuntime::multianewarrayN_Java(), NULL, TypeRawPtr::BOTTOM, |
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516 makecon(TypeKlassPtr::make(array_klass)), |
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517 dims); |
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518 } |
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519 make_slow_call_ex(c, env()->Throwable_klass(), false); |
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520 |
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521 Node* res = _gvn.transform(new (C) ProjNode(c, TypeFunc::Parms)); |
0 | 522 |
523 const Type* type = TypeOopPtr::make_from_klass_raw(array_klass); | |
524 | |
525 // Improve the type: We know it's not null, exact, and of a given length. | |
526 type = type->is_ptr()->cast_to_ptr_type(TypePtr::NotNull); | |
527 type = type->is_aryptr()->cast_to_exactness(true); | |
528 | |
529 const TypeInt* ltype = _gvn.find_int_type(length[0]); | |
530 if (ltype != NULL) | |
531 type = type->is_aryptr()->cast_to_size(ltype); | |
532 | |
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533 // We cannot sharpen the nested sub-arrays, since the top level is mutable. |
0 | 534 |
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535 Node* cast = _gvn.transform( new (C) CheckCastPPNode(control(), res, type) ); |
0 | 536 push(cast); |
537 | |
538 // Possible improvements: | |
539 // - Make a fast path for small multi-arrays. (W/ implicit init. loops.) | |
540 // - Issue CastII against length[*] values, to TypeInt::POS. | |
541 } |