handler-compiler-ia32.cc revision f91f0611dbaf29ca0f1d4aecb357ce243a19d2fa 
1// Copyright 2014 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#if V8_TARGET_ARCH_IA32
6
7#include "src/ic/handler-compiler.h"
8
9#include "src/api-arguments.h"
10#include "src/field-type.h"
11#include "src/ic/call-optimization.h"
12#include "src/ic/ic.h"
13#include "src/isolate-inl.h"
14
15namespace v8 {
16namespace internal {
17
18#define __ ACCESS_MASM(masm)
19
20
21void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
22    MacroAssembler* masm, Handle<Map> map, Register receiver, Register holder,
23    int accessor_index, int expected_arguments, Register scratch) {
24  {
25    FrameScope scope(masm, StackFrame::INTERNAL);
26
27    // Save context register
28    __ push(esi);
29
30    if (accessor_index >= 0) {
31      DCHECK(!holder.is(scratch));
32      DCHECK(!receiver.is(scratch));
33      // Call the JavaScript getter with the receiver on the stack.
34      if (map->IsJSGlobalObjectMap()) {
35        // Swap in the global receiver.
36        __ mov(scratch,
37               FieldOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
38        receiver = scratch;
39      }
40      __ push(receiver);
41      __ LoadAccessor(edi, holder, accessor_index, ACCESSOR_GETTER);
42      __ Set(eax, 0);
43      __ Call(masm->isolate()->builtins()->CallFunction(
44                  ConvertReceiverMode::kNotNullOrUndefined),
45              RelocInfo::CODE_TARGET);
46    } else {
47      // If we generate a global code snippet for deoptimization only, remember
48      // the place to continue after deoptimization.
49      masm->isolate()->heap()->SetGetterStubDeoptPCOffset(masm->pc_offset());
50    }
51
52    // Restore context register.
53    __ pop(esi);
54  }
55  __ ret(0);
56}
57
58
59void PropertyHandlerCompiler::PushVectorAndSlot(Register vector,
60                                                Register slot) {
61  MacroAssembler* masm = this->masm();
62  __ push(vector);
63  __ push(slot);
64}
65
66
67void PropertyHandlerCompiler::PopVectorAndSlot(Register vector, Register slot) {
68  MacroAssembler* masm = this->masm();
69  __ pop(slot);
70  __ pop(vector);
71}
72
73
74void PropertyHandlerCompiler::DiscardVectorAndSlot() {
75  MacroAssembler* masm = this->masm();
76  // Remove vector and slot.
77  __ add(esp, Immediate(2 * kPointerSize));
78}
79
80
81void PropertyHandlerCompiler::GenerateDictionaryNegativeLookup(
82    MacroAssembler* masm, Label* miss_label, Register receiver,
83    Handle<Name> name, Register scratch0, Register scratch1) {
84  DCHECK(name->IsUniqueName());
85  DCHECK(!receiver.is(scratch0));
86  Counters* counters = masm->isolate()->counters();
87  __ IncrementCounter(counters->negative_lookups(), 1);
88  __ IncrementCounter(counters->negative_lookups_miss(), 1);
89
90  __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
91
92  const int kInterceptorOrAccessCheckNeededMask =
93      (1 << Map::kHasNamedInterceptor) | (1 << Map::kIsAccessCheckNeeded);
94
95  // Bail out if the receiver has a named interceptor or requires access checks.
96  __ test_b(FieldOperand(scratch0, Map::kBitFieldOffset),
97            Immediate(kInterceptorOrAccessCheckNeededMask));
98  __ j(not_zero, miss_label);
99
100  // Check that receiver is a JSObject.
101  __ CmpInstanceType(scratch0, FIRST_JS_RECEIVER_TYPE);
102  __ j(below, miss_label);
103
104  // Load properties array.
105  Register properties = scratch0;
106  __ mov(properties, FieldOperand(receiver, JSObject::kPropertiesOffset));
107
108  // Check that the properties array is a dictionary.
109  __ cmp(FieldOperand(properties, HeapObject::kMapOffset),
110         Immediate(masm->isolate()->factory()->hash_table_map()));
111  __ j(not_equal, miss_label);
112
113  Label done;
114  NameDictionaryLookupStub::GenerateNegativeLookup(masm, miss_label, &done,
115                                                   properties, name, scratch1);
116  __ bind(&done);
117  __ DecrementCounter(counters->negative_lookups_miss(), 1);
118}
119
120
121void NamedLoadHandlerCompiler::GenerateDirectLoadGlobalFunctionPrototype(
122    MacroAssembler* masm, int index, Register result, Label* miss) {
123  __ LoadGlobalFunction(index, result);
124  // Load its initial map. The global functions all have initial maps.
125  __ mov(result,
126         FieldOperand(result, JSFunction::kPrototypeOrInitialMapOffset));
127  // Load the prototype from the initial map.
128  __ mov(result, FieldOperand(result, Map::kPrototypeOffset));
129}
130
131
132void NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(
133    MacroAssembler* masm, Register receiver, Register scratch1,
134    Register scratch2, Label* miss_label) {
135  // TODO(mvstanton): This isn't used on ia32. Move all the other
136  // platform implementations into a code stub so this method can be removed.
137  UNREACHABLE();
138}
139
140
141// Generate call to api function.
142// This function uses push() to generate smaller, faster code than
143// the version above. It is an optimization that should will be removed
144// when api call ICs are generated in hydrogen.
145void PropertyHandlerCompiler::GenerateApiAccessorCall(
146    MacroAssembler* masm, const CallOptimization& optimization,
147    Handle<Map> receiver_map, Register receiver, Register scratch,
148    bool is_store, Register store_parameter, Register accessor_holder,
149    int accessor_index) {
150  DCHECK(!accessor_holder.is(scratch));
151  // Copy return value.
152  __ pop(scratch);
153  // receiver
154  __ push(receiver);
155  // Write the arguments to stack frame.
156  if (is_store) {
157    DCHECK(!receiver.is(store_parameter));
158    DCHECK(!scratch.is(store_parameter));
159    __ push(store_parameter);
160  }
161  __ push(scratch);
162  // Stack now matches JSFunction abi.
163  DCHECK(optimization.is_simple_api_call());
164
165  // Abi for CallApiCallbackStub.
166  Register callee = edi;
167  Register data = ebx;
168  Register holder = ecx;
169  Register api_function_address = edx;
170  scratch = no_reg;
171
172  // Put callee in place.
173  __ LoadAccessor(callee, accessor_holder, accessor_index,
174                  is_store ? ACCESSOR_SETTER : ACCESSOR_GETTER);
175
176  // Put holder in place.
177  CallOptimization::HolderLookup holder_lookup;
178  int holder_depth = 0;
179  optimization.LookupHolderOfExpectedType(receiver_map, &holder_lookup,
180                                          &holder_depth);
181  switch (holder_lookup) {
182    case CallOptimization::kHolderIsReceiver:
183      __ Move(holder, receiver);
184      break;
185    case CallOptimization::kHolderFound:
186      __ mov(holder, FieldOperand(receiver, HeapObject::kMapOffset));
187      __ mov(holder, FieldOperand(holder, Map::kPrototypeOffset));
188      for (int i = 1; i < holder_depth; i++) {
189        __ mov(holder, FieldOperand(holder, HeapObject::kMapOffset));
190        __ mov(holder, FieldOperand(holder, Map::kPrototypeOffset));
191      }
192      break;
193    case CallOptimization::kHolderNotFound:
194      UNREACHABLE();
195      break;
196  }
197
198  Isolate* isolate = masm->isolate();
199  Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
200  bool call_data_undefined = false;
201  // Put call data in place.
202  if (api_call_info->data()->IsUndefined(isolate)) {
203    call_data_undefined = true;
204    __ mov(data, Immediate(isolate->factory()->undefined_value()));
205  } else {
206    if (optimization.is_constant_call()) {
207      __ mov(data, FieldOperand(callee, JSFunction::kSharedFunctionInfoOffset));
208      __ mov(data, FieldOperand(data, SharedFunctionInfo::kFunctionDataOffset));
209      __ mov(data, FieldOperand(data, FunctionTemplateInfo::kCallCodeOffset));
210    } else {
211      __ mov(data, FieldOperand(callee, FunctionTemplateInfo::kCallCodeOffset));
212    }
213    __ mov(data, FieldOperand(data, CallHandlerInfo::kDataOffset));
214  }
215
216  if (api_call_info->fast_handler()->IsCode()) {
217    // Just tail call into the code.
218    __ Jump(handle(Code::cast(api_call_info->fast_handler())),
219            RelocInfo::CODE_TARGET);
220    return;
221  }
222  // Put api_function_address in place.
223  Address function_address = v8::ToCData<Address>(api_call_info->callback());
224  __ mov(api_function_address, Immediate(function_address));
225
226  // Jump to stub.
227  CallApiCallbackStub stub(isolate, is_store, call_data_undefined,
228                           !optimization.is_constant_call());
229  __ TailCallStub(&stub);
230}
231
232
233// Generate code to check that a global property cell is empty. Create
234// the property cell at compilation time if no cell exists for the
235// property.
236void PropertyHandlerCompiler::GenerateCheckPropertyCell(
237    MacroAssembler* masm, Handle<JSGlobalObject> global, Handle<Name> name,
238    Register scratch, Label* miss) {
239  Handle<PropertyCell> cell = JSGlobalObject::EnsureEmptyPropertyCell(
240      global, name, PropertyCellType::kInvalidated);
241  Isolate* isolate = masm->isolate();
242  DCHECK(cell->value()->IsTheHole(isolate));
243  Handle<WeakCell> weak_cell = isolate->factory()->NewWeakCell(cell);
244  __ LoadWeakValue(scratch, weak_cell, miss);
245  __ cmp(FieldOperand(scratch, PropertyCell::kValueOffset),
246         Immediate(isolate->factory()->the_hole_value()));
247  __ j(not_equal, miss);
248}
249
250
251void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
252    MacroAssembler* masm, Handle<Map> map, Register receiver, Register holder,
253    int accessor_index, int expected_arguments, Register scratch) {
254  // ----------- S t a t e -------------
255  //  -- esp[0] : return address
256  // -----------------------------------
257  {
258    FrameScope scope(masm, StackFrame::INTERNAL);
259
260    // Save context register
261    __ push(esi);
262    // Save value register, so we can restore it later.
263    __ push(value());
264
265    if (accessor_index >= 0) {
266      DCHECK(!holder.is(scratch));
267      DCHECK(!receiver.is(scratch));
268      DCHECK(!value().is(scratch));
269      // Call the JavaScript setter with receiver and value on the stack.
270      if (map->IsJSGlobalObjectMap()) {
271        __ mov(scratch,
272               FieldOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
273        receiver = scratch;
274      }
275      __ push(receiver);
276      __ push(value());
277      __ LoadAccessor(edi, holder, accessor_index, ACCESSOR_SETTER);
278      __ Set(eax, 1);
279      __ Call(masm->isolate()->builtins()->CallFunction(
280                  ConvertReceiverMode::kNotNullOrUndefined),
281              RelocInfo::CODE_TARGET);
282    } else {
283      // If we generate a global code snippet for deoptimization only, remember
284      // the place to continue after deoptimization.
285      masm->isolate()->heap()->SetSetterStubDeoptPCOffset(masm->pc_offset());
286    }
287
288    // We have to return the passed value, not the return value of the setter.
289    __ pop(eax);
290    // Restore context register.
291    __ pop(esi);
292  }
293  __ ret(0);
294}
295
296
297static void PushInterceptorArguments(MacroAssembler* masm, Register receiver,
298                                     Register holder, Register name,
299                                     Handle<JSObject> holder_obj) {
300  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsNameIndex == 0);
301  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsThisIndex == 1);
302  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsHolderIndex == 2);
303  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsLength == 3);
304  __ push(name);
305  __ push(receiver);
306  __ push(holder);
307}
308
309
310static void CompileCallLoadPropertyWithInterceptor(
311    MacroAssembler* masm, Register receiver, Register holder, Register name,
312    Handle<JSObject> holder_obj, Runtime::FunctionId id) {
313  DCHECK(NamedLoadHandlerCompiler::kInterceptorArgsLength ==
314         Runtime::FunctionForId(id)->nargs);
315  PushInterceptorArguments(masm, receiver, holder, name, holder_obj);
316  __ CallRuntime(id);
317}
318
319
320static void StoreIC_PushArgs(MacroAssembler* masm) {
321  Register receiver = StoreDescriptor::ReceiverRegister();
322  Register name = StoreDescriptor::NameRegister();
323  Register value = StoreDescriptor::ValueRegister();
324  Register slot = StoreWithVectorDescriptor::SlotRegister();
325  Register vector = StoreWithVectorDescriptor::VectorRegister();
326
327  __ xchg(receiver, Operand(esp, 0));
328  __ push(name);
329  __ push(value);
330  __ push(slot);
331  __ push(vector);
332  __ push(receiver);  // which contains the return address.
333}
334
335
336void ElementHandlerCompiler::GenerateStoreSlow(MacroAssembler* masm) {
337  // Return address is on the stack.
338  StoreIC_PushArgs(masm);
339
340  // Do tail-call to runtime routine.
341  __ TailCallRuntime(Runtime::kKeyedStoreIC_Slow);
342}
343
344
345#undef __
346#define __ ACCESS_MASM(masm())
347
348
349void NamedStoreHandlerCompiler::GenerateRestoreName(Label* label,
350                                                    Handle<Name> name) {
351  if (!label->is_unused()) {
352    __ bind(label);
353    __ mov(this->name(), Immediate(name));
354  }
355}
356
357
358void NamedStoreHandlerCompiler::GenerateRestoreName(Handle<Name> name) {
359  __ mov(this->name(), Immediate(name));
360}
361
362
363void NamedStoreHandlerCompiler::RearrangeVectorAndSlot(
364    Register current_map, Register destination_map) {
365  DCHECK(destination_map.is(StoreTransitionHelper::MapRegister()));
366  DCHECK(current_map.is(StoreTransitionHelper::VectorRegister()));
367  ExternalReference virtual_slot =
368      ExternalReference::virtual_slot_register(isolate());
369  __ mov(destination_map, current_map);
370  __ pop(current_map);
371  __ mov(Operand::StaticVariable(virtual_slot), current_map);
372  __ pop(current_map);  // put vector in place.
373}
374
375
376void NamedStoreHandlerCompiler::GenerateRestoreMap(Handle<Map> transition,
377                                                   Register map_reg,
378                                                   Register scratch,
379                                                   Label* miss) {
380  Handle<WeakCell> cell = Map::WeakCellForMap(transition);
381  DCHECK(!map_reg.is(scratch));
382  __ LoadWeakValue(map_reg, cell, miss);
383  if (transition->CanBeDeprecated()) {
384    __ mov(scratch, FieldOperand(map_reg, Map::kBitField3Offset));
385    __ and_(scratch, Immediate(Map::Deprecated::kMask));
386    __ j(not_zero, miss);
387  }
388}
389
390
391void NamedStoreHandlerCompiler::GenerateConstantCheck(Register map_reg,
392                                                      int descriptor,
393                                                      Register value_reg,
394                                                      Register scratch,
395                                                      Label* miss_label) {
396  DCHECK(!map_reg.is(scratch));
397  DCHECK(!map_reg.is(value_reg));
398  DCHECK(!value_reg.is(scratch));
399  __ LoadInstanceDescriptors(map_reg, scratch);
400  __ mov(scratch,
401         FieldOperand(scratch, DescriptorArray::GetValueOffset(descriptor)));
402  __ cmp(value_reg, scratch);
403  __ j(not_equal, miss_label);
404}
405
406void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(FieldType* field_type,
407                                                        Register value_reg,
408                                                        Label* miss_label) {
409  Register map_reg = scratch1();
410  Register scratch = scratch2();
411  DCHECK(!value_reg.is(map_reg));
412  DCHECK(!value_reg.is(scratch));
413  __ JumpIfSmi(value_reg, miss_label);
414  if (field_type->IsClass()) {
415    __ mov(map_reg, FieldOperand(value_reg, HeapObject::kMapOffset));
416    __ CmpWeakValue(map_reg, Map::WeakCellForMap(field_type->AsClass()),
417                    scratch);
418    __ j(not_equal, miss_label);
419  }
420}
421
422
423Register PropertyHandlerCompiler::CheckPrototypes(
424    Register object_reg, Register holder_reg, Register scratch1,
425    Register scratch2, Handle<Name> name, Label* miss, PrototypeCheckType check,
426    ReturnHolder return_what) {
427  Handle<Map> receiver_map = map();
428
429  // Make sure there's no overlap between holder and object registers.
430  DCHECK(!scratch1.is(object_reg) && !scratch1.is(holder_reg));
431  DCHECK(!scratch2.is(object_reg) && !scratch2.is(holder_reg) &&
432         !scratch2.is(scratch1));
433
434  Handle<Cell> validity_cell =
435      Map::GetOrCreatePrototypeChainValidityCell(receiver_map, isolate());
436  if (!validity_cell.is_null()) {
437    DCHECK_EQ(Smi::FromInt(Map::kPrototypeChainValid), validity_cell->value());
438    // Operand::ForCell(...) points to the cell's payload!
439    __ cmp(Operand::ForCell(validity_cell),
440           Immediate(Smi::FromInt(Map::kPrototypeChainValid)));
441    __ j(not_equal, miss);
442  }
443
444  // The prototype chain of primitives (and their JSValue wrappers) depends
445  // on the native context, which can't be guarded by validity cells.
446  // |object_reg| holds the native context specific prototype in this case;
447  // we need to check its map.
448  if (check == CHECK_ALL_MAPS) {
449    __ mov(scratch1, FieldOperand(object_reg, HeapObject::kMapOffset));
450    Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map);
451    __ CmpWeakValue(scratch1, cell, scratch2);
452    __ j(not_equal, miss);
453  }
454
455  // Keep track of the current object in register reg.
456  Register reg = object_reg;
457  int depth = 0;
458
459  Handle<JSObject> current = Handle<JSObject>::null();
460  if (receiver_map->IsJSGlobalObjectMap()) {
461    current = isolate()->global_object();
462  }
463
464  // Check access rights to the global object.  This has to happen after
465  // the map check so that we know that the object is actually a global
466  // object.
467  // This allows us to install generated handlers for accesses to the
468  // global proxy (as opposed to using slow ICs). See corresponding code
469  // in LookupForRead().
470  if (receiver_map->IsJSGlobalProxyMap()) {
471    __ CheckAccessGlobalProxy(reg, scratch1, scratch2, miss);
472  }
473
474  Handle<JSObject> prototype = Handle<JSObject>::null();
475  Handle<Map> current_map = receiver_map;
476  Handle<Map> holder_map(holder()->map());
477  // Traverse the prototype chain and check the maps in the prototype chain for
478  // fast and global objects or do negative lookup for normal objects.
479  while (!current_map.is_identical_to(holder_map)) {
480    ++depth;
481
482    // Only global objects and objects that do not require access
483    // checks are allowed in stubs.
484    DCHECK(current_map->IsJSGlobalProxyMap() ||
485           !current_map->is_access_check_needed());
486
487    prototype = handle(JSObject::cast(current_map->prototype()));
488    if (current_map->IsJSGlobalObjectMap()) {
489      GenerateCheckPropertyCell(masm(), Handle<JSGlobalObject>::cast(current),
490                                name, scratch2, miss);
491    } else if (current_map->is_dictionary_map()) {
492      DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.
493      if (!name->IsUniqueName()) {
494        DCHECK(name->IsString());
495        name = factory()->InternalizeString(Handle<String>::cast(name));
496      }
497      DCHECK(current.is_null() ||
498             current->property_dictionary()->FindEntry(name) ==
499                 NameDictionary::kNotFound);
500
501      if (depth > 1) {
502        // TODO(jkummerow): Cache and re-use weak cell.
503        __ LoadWeakValue(reg, isolate()->factory()->NewWeakCell(current), miss);
504      }
505      GenerateDictionaryNegativeLookup(masm(), miss, reg, name, scratch1,
506                                       scratch2);
507    }
508
509    reg = holder_reg;  // From now on the object will be in holder_reg.
510    // Go to the next object in the prototype chain.
511    current = prototype;
512    current_map = handle(current->map());
513  }
514
515  DCHECK(!current_map->IsJSGlobalProxyMap());
516
517  // Log the check depth.
518  LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
519
520  bool return_holder = return_what == RETURN_HOLDER;
521  if (return_holder && depth != 0) {
522    __ LoadWeakValue(reg, isolate()->factory()->NewWeakCell(current), miss);
523  }
524
525  // Return the register containing the holder.
526  return return_holder ? reg : no_reg;
527}
528
529
530void NamedLoadHandlerCompiler::FrontendFooter(Handle<Name> name, Label* miss) {
531  if (!miss->is_unused()) {
532    Label success;
533    __ jmp(&success);
534    __ bind(miss);
535    if (IC::ICUseVector(kind())) {
536      DCHECK(kind() == Code::LOAD_IC);
537      PopVectorAndSlot();
538    }
539    TailCallBuiltin(masm(), MissBuiltin(kind()));
540    __ bind(&success);
541  }
542}
543
544
545void NamedStoreHandlerCompiler::FrontendFooter(Handle<Name> name, Label* miss) {
546  if (!miss->is_unused()) {
547    Label success;
548    __ jmp(&success);
549    GenerateRestoreName(miss, name);
550    if (IC::ICUseVector(kind())) PopVectorAndSlot();
551    TailCallBuiltin(masm(), MissBuiltin(kind()));
552    __ bind(&success);
553  }
554}
555
556
557void NamedLoadHandlerCompiler::GenerateLoadConstant(Handle<Object> value) {
558  // Return the constant value.
559  __ LoadObject(eax, value);
560  __ ret(0);
561}
562
563
564void NamedLoadHandlerCompiler::GenerateLoadInterceptorWithFollowup(
565    LookupIterator* it, Register holder_reg) {
566  DCHECK(holder()->HasNamedInterceptor());
567  DCHECK(!holder()->GetNamedInterceptor()->getter()->IsUndefined(isolate()));
568
569  // Compile the interceptor call, followed by inline code to load the
570  // property from further up the prototype chain if the call fails.
571  // Check that the maps haven't changed.
572  DCHECK(holder_reg.is(receiver()) || holder_reg.is(scratch1()));
573
574  // Preserve the receiver register explicitly whenever it is different from the
575  // holder and it is needed should the interceptor return without any result.
576  // The ACCESSOR case needs the receiver to be passed into C++ code, the FIELD
577  // case might cause a miss during the prototype check.
578  bool must_perform_prototype_check =
579      !holder().is_identical_to(it->GetHolder<JSObject>());
580  bool must_preserve_receiver_reg =
581      !receiver().is(holder_reg) &&
582      (it->state() == LookupIterator::ACCESSOR || must_perform_prototype_check);
583
584  // Save necessary data before invoking an interceptor.
585  // Requires a frame to make GC aware of pushed pointers.
586  {
587    FrameScope frame_scope(masm(), StackFrame::INTERNAL);
588
589    if (must_preserve_receiver_reg) {
590      __ push(receiver());
591    }
592    __ push(holder_reg);
593    __ push(this->name());
594    InterceptorVectorSlotPush(holder_reg);
595    // Invoke an interceptor.  Note: map checks from receiver to
596    // interceptor's holder has been compiled before (see a caller
597    // of this method.)
598    CompileCallLoadPropertyWithInterceptor(
599        masm(), receiver(), holder_reg, this->name(), holder(),
600        Runtime::kLoadPropertyWithInterceptorOnly);
601
602    // Check if interceptor provided a value for property.  If it's
603    // the case, return immediately.
604    Label interceptor_failed;
605    __ cmp(eax, factory()->no_interceptor_result_sentinel());
606    __ j(equal, &interceptor_failed);
607    frame_scope.GenerateLeaveFrame();
608    __ ret(0);
609
610    // Clobber registers when generating debug-code to provoke errors.
611    __ bind(&interceptor_failed);
612    if (FLAG_debug_code) {
613      __ mov(receiver(), Immediate(bit_cast<int32_t>(kZapValue)));
614      __ mov(holder_reg, Immediate(bit_cast<int32_t>(kZapValue)));
615      __ mov(this->name(), Immediate(bit_cast<int32_t>(kZapValue)));
616    }
617
618    InterceptorVectorSlotPop(holder_reg);
619    __ pop(this->name());
620    __ pop(holder_reg);
621    if (must_preserve_receiver_reg) {
622      __ pop(receiver());
623    }
624
625    // Leave the internal frame.
626  }
627
628  GenerateLoadPostInterceptor(it, holder_reg);
629}
630
631
632void NamedLoadHandlerCompiler::GenerateLoadInterceptor(Register holder_reg) {
633  DCHECK(holder()->HasNamedInterceptor());
634  DCHECK(!holder()->GetNamedInterceptor()->getter()->IsUndefined(isolate()));
635  // Call the runtime system to load the interceptor.
636  __ pop(scratch2());  // save old return address
637  PushInterceptorArguments(masm(), receiver(), holder_reg, this->name(),
638                           holder());
639  __ push(scratch2());  // restore old return address
640
641  __ TailCallRuntime(Runtime::kLoadPropertyWithInterceptor);
642}
643
644
645Handle<Code> NamedStoreHandlerCompiler::CompileStoreCallback(
646    Handle<JSObject> object, Handle<Name> name, Handle<AccessorInfo> callback,
647    LanguageMode language_mode) {
648  Register holder_reg = Frontend(name);
649
650  __ pop(scratch1());  // remove the return address
651  __ push(receiver());
652  __ push(holder_reg);
653  // If the callback cannot leak, then push the callback directly,
654  // otherwise wrap it in a weak cell.
655  if (callback->data()->IsUndefined(isolate()) || callback->data()->IsSmi()) {
656    __ Push(callback);
657  } else {
658    Handle<WeakCell> cell = isolate()->factory()->NewWeakCell(callback);
659    __ Push(cell);
660  }
661  __ Push(name);
662  __ push(value());
663  __ push(Immediate(Smi::FromInt(language_mode)));
664  __ push(scratch1());  // restore return address
665
666  // Do tail-call to the runtime system.
667  __ TailCallRuntime(Runtime::kStoreCallbackProperty);
668
669  // Return the generated code.
670  return GetCode(kind(), name);
671}
672
673
674Register NamedStoreHandlerCompiler::value() {
675  return StoreDescriptor::ValueRegister();
676}
677
678
679Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
680    Handle<PropertyCell> cell, Handle<Name> name, bool is_configurable) {
681  Label miss;
682  if (IC::ICUseVector(kind())) {
683    PushVectorAndSlot();
684  }
685  FrontendHeader(receiver(), name, &miss, DONT_RETURN_ANYTHING);
686  // Get the value from the cell.
687  Register result = StoreDescriptor::ValueRegister();
688  Handle<WeakCell> weak_cell = factory()->NewWeakCell(cell);
689  __ LoadWeakValue(result, weak_cell, &miss);
690  __ mov(result, FieldOperand(result, PropertyCell::kValueOffset));
691
692  // Check for deleted property if property can actually be deleted.
693  if (is_configurable) {
694    __ cmp(result, factory()->the_hole_value());
695    __ j(equal, &miss);
696  } else if (FLAG_debug_code) {
697    __ cmp(result, factory()->the_hole_value());
698    __ Check(not_equal, kDontDeleteCellsCannotContainTheHole);
699  }
700
701  Counters* counters = isolate()->counters();
702  __ IncrementCounter(counters->ic_named_load_global_stub(), 1);
703  // The code above already loads the result into the return register.
704  if (IC::ICUseVector(kind())) {
705    DiscardVectorAndSlot();
706  }
707  __ ret(0);
708
709  FrontendFooter(name, &miss);
710
711  // Return the generated code.
712  return GetCode(kind(), name);
713}
714
715
716#undef __
717}  // namespace internal
718}  // namespace v8
719
720#endif  // V8_TARGET_ARCH_IA32
721