handler-compiler-x87.cc revision 958fae7ec3f466955f8e5b50fa5b8d38b9e91675 
1// Copyright 2012 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#include "src/v8.h"
6
7#if V8_TARGET_ARCH_X87
8
9#include "src/ic/call-optimization.h"
10#include "src/ic/handler-compiler.h"
11#include "src/ic/ic.h"
12
13namespace v8 {
14namespace internal {
15
16#define __ ACCESS_MASM(masm)
17
18
19void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
20    MacroAssembler* masm, Handle<HeapType> type, Register receiver,
21    Handle<JSFunction> getter) {
22  {
23    FrameScope scope(masm, StackFrame::INTERNAL);
24
25    if (!getter.is_null()) {
26      // Call the JavaScript getter with the receiver on the stack.
27      if (IC::TypeToMap(*type, masm->isolate())->IsJSGlobalObjectMap()) {
28        // Swap in the global receiver.
29        __ mov(receiver,
30               FieldOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
31      }
32      __ push(receiver);
33      ParameterCount actual(0);
34      ParameterCount expected(getter);
35      __ InvokeFunction(getter, expected, actual, CALL_FUNCTION,
36                        NullCallWrapper());
37    } else {
38      // If we generate a global code snippet for deoptimization only, remember
39      // the place to continue after deoptimization.
40      masm->isolate()->heap()->SetGetterStubDeoptPCOffset(masm->pc_offset());
41    }
42
43    // Restore context register.
44    __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
45  }
46  __ ret(0);
47}
48
49
50void PropertyHandlerCompiler::PushVectorAndSlot(Register vector,
51                                                Register slot) {
52  MacroAssembler* masm = this->masm();
53  __ push(vector);
54  __ push(slot);
55}
56
57
58void PropertyHandlerCompiler::PopVectorAndSlot(Register vector, Register slot) {
59  MacroAssembler* masm = this->masm();
60  __ pop(slot);
61  __ pop(vector);
62}
63
64
65void PropertyHandlerCompiler::DiscardVectorAndSlot() {
66  MacroAssembler* masm = this->masm();
67  // Remove vector and slot.
68  __ add(esp, Immediate(2 * kPointerSize));
69}
70
71
72void PropertyHandlerCompiler::GenerateDictionaryNegativeLookup(
73    MacroAssembler* masm, Label* miss_label, Register receiver,
74    Handle<Name> name, Register scratch0, Register scratch1) {
75  DCHECK(name->IsUniqueName());
76  DCHECK(!receiver.is(scratch0));
77  Counters* counters = masm->isolate()->counters();
78  __ IncrementCounter(counters->negative_lookups(), 1);
79  __ IncrementCounter(counters->negative_lookups_miss(), 1);
80
81  __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
82
83  const int kInterceptorOrAccessCheckNeededMask =
84      (1 << Map::kHasNamedInterceptor) | (1 << Map::kIsAccessCheckNeeded);
85
86  // Bail out if the receiver has a named interceptor or requires access checks.
87  __ test_b(FieldOperand(scratch0, Map::kBitFieldOffset),
88            kInterceptorOrAccessCheckNeededMask);
89  __ j(not_zero, miss_label);
90
91  // Check that receiver is a JSObject.
92  __ CmpInstanceType(scratch0, FIRST_SPEC_OBJECT_TYPE);
93  __ j(below, miss_label);
94
95  // Load properties array.
96  Register properties = scratch0;
97  __ mov(properties, FieldOperand(receiver, JSObject::kPropertiesOffset));
98
99  // Check that the properties array is a dictionary.
100  __ cmp(FieldOperand(properties, HeapObject::kMapOffset),
101         Immediate(masm->isolate()->factory()->hash_table_map()));
102  __ j(not_equal, miss_label);
103
104  Label done;
105  NameDictionaryLookupStub::GenerateNegativeLookup(masm, miss_label, &done,
106                                                   properties, name, scratch1);
107  __ bind(&done);
108  __ DecrementCounter(counters->negative_lookups_miss(), 1);
109}
110
111
112void NamedLoadHandlerCompiler::GenerateDirectLoadGlobalFunctionPrototype(
113    MacroAssembler* masm, int index, Register result, Label* miss) {
114  const int offset = Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX);
115  __ mov(result, Operand(esi, offset));
116  __ mov(result, FieldOperand(result, GlobalObject::kNativeContextOffset));
117  __ mov(result, Operand(result, Context::SlotOffset(index)));
118  // Load its initial map. The global functions all have initial maps.
119  __ mov(result,
120         FieldOperand(result, JSFunction::kPrototypeOrInitialMapOffset));
121  // Load the prototype from the initial map.
122  __ mov(result, FieldOperand(result, Map::kPrototypeOffset));
123}
124
125
126void NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(
127    MacroAssembler* masm, Register receiver, Register scratch1,
128    Register scratch2, Label* miss_label) {
129  DCHECK(!FLAG_vector_ics);
130  __ TryGetFunctionPrototype(receiver, scratch1, scratch2, miss_label);
131  __ mov(eax, scratch1);
132  __ ret(0);
133}
134
135
136// Generate call to api function.
137// This function uses push() to generate smaller, faster code than
138// the version above. It is an optimization that should will be removed
139// when api call ICs are generated in hydrogen.
140void PropertyHandlerCompiler::GenerateFastApiCall(
141    MacroAssembler* masm, const CallOptimization& optimization,
142    Handle<Map> receiver_map, Register receiver, Register scratch_in,
143    bool is_store, int argc, Register* values) {
144  // Copy return value.
145  __ pop(scratch_in);
146  // receiver
147  __ push(receiver);
148  // Write the arguments to stack frame.
149  for (int i = 0; i < argc; i++) {
150    Register arg = values[argc - 1 - i];
151    DCHECK(!receiver.is(arg));
152    DCHECK(!scratch_in.is(arg));
153    __ push(arg);
154  }
155  __ push(scratch_in);
156  // Stack now matches JSFunction abi.
157  DCHECK(optimization.is_simple_api_call());
158
159  // Abi for CallApiFunctionStub.
160  Register callee = eax;
161  Register call_data = ebx;
162  Register holder = ecx;
163  Register api_function_address = edx;
164  Register scratch = edi;  // scratch_in is no longer valid.
165
166  // Put holder in place.
167  CallOptimization::HolderLookup holder_lookup;
168  Handle<JSObject> api_holder =
169      optimization.LookupHolderOfExpectedType(receiver_map, &holder_lookup);
170  switch (holder_lookup) {
171    case CallOptimization::kHolderIsReceiver:
172      __ Move(holder, receiver);
173      break;
174    case CallOptimization::kHolderFound:
175      __ LoadHeapObject(holder, api_holder);
176      break;
177    case CallOptimization::kHolderNotFound:
178      UNREACHABLE();
179      break;
180  }
181
182  Isolate* isolate = masm->isolate();
183  Handle<JSFunction> function = optimization.constant_function();
184  Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
185  Handle<Object> call_data_obj(api_call_info->data(), isolate);
186
187  // Put callee in place.
188  __ LoadHeapObject(callee, function);
189
190  bool call_data_undefined = false;
191  // Put call_data in place.
192  if (isolate->heap()->InNewSpace(*call_data_obj)) {
193    __ mov(scratch, api_call_info);
194    __ mov(call_data, FieldOperand(scratch, CallHandlerInfo::kDataOffset));
195  } else if (call_data_obj->IsUndefined()) {
196    call_data_undefined = true;
197    __ mov(call_data, Immediate(isolate->factory()->undefined_value()));
198  } else {
199    __ mov(call_data, call_data_obj);
200  }
201
202  // Put api_function_address in place.
203  Address function_address = v8::ToCData<Address>(api_call_info->callback());
204  __ mov(api_function_address, Immediate(function_address));
205
206  // Jump to stub.
207  CallApiFunctionStub stub(isolate, is_store, call_data_undefined, argc);
208  __ TailCallStub(&stub);
209}
210
211
212// Generate code to check that a global property cell is empty. Create
213// the property cell at compilation time if no cell exists for the
214// property.
215void PropertyHandlerCompiler::GenerateCheckPropertyCell(
216    MacroAssembler* masm, Handle<JSGlobalObject> global, Handle<Name> name,
217    Register scratch, Label* miss) {
218  Handle<PropertyCell> cell = JSGlobalObject::EnsurePropertyCell(global, name);
219  DCHECK(cell->value()->IsTheHole());
220  Handle<Oddball> the_hole = masm->isolate()->factory()->the_hole_value();
221  if (masm->serializer_enabled()) {
222    __ mov(scratch, Immediate(cell));
223    __ cmp(FieldOperand(scratch, PropertyCell::kValueOffset),
224           Immediate(the_hole));
225  } else {
226    __ cmp(Operand::ForCell(cell), Immediate(the_hole));
227  }
228  __ j(not_equal, miss);
229}
230
231
232void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
233    MacroAssembler* masm, Handle<HeapType> type, Register receiver,
234    Handle<JSFunction> setter) {
235  // ----------- S t a t e -------------
236  //  -- esp[0] : return address
237  // -----------------------------------
238  {
239    FrameScope scope(masm, StackFrame::INTERNAL);
240
241    // Save value register, so we can restore it later.
242    __ push(value());
243
244    if (!setter.is_null()) {
245      // Call the JavaScript setter with receiver and value on the stack.
246      if (IC::TypeToMap(*type, masm->isolate())->IsJSGlobalObjectMap()) {
247        // Swap in the global receiver.
248        __ mov(receiver,
249               FieldOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
250      }
251      __ push(receiver);
252      __ push(value());
253      ParameterCount actual(1);
254      ParameterCount expected(setter);
255      __ InvokeFunction(setter, expected, actual, CALL_FUNCTION,
256                        NullCallWrapper());
257    } else {
258      // If we generate a global code snippet for deoptimization only, remember
259      // the place to continue after deoptimization.
260      masm->isolate()->heap()->SetSetterStubDeoptPCOffset(masm->pc_offset());
261    }
262
263    // We have to return the passed value, not the return value of the setter.
264    __ pop(eax);
265
266    // Restore context register.
267    __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
268  }
269  __ ret(0);
270}
271
272
273static void PushInterceptorArguments(MacroAssembler* masm, Register receiver,
274                                     Register holder, Register name,
275                                     Handle<JSObject> holder_obj) {
276  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsNameIndex == 0);
277  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsInfoIndex == 1);
278  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsThisIndex == 2);
279  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsHolderIndex == 3);
280  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsLength == 4);
281  __ push(name);
282  Handle<InterceptorInfo> interceptor(holder_obj->GetNamedInterceptor());
283  DCHECK(!masm->isolate()->heap()->InNewSpace(*interceptor));
284  Register scratch = name;
285  __ mov(scratch, Immediate(interceptor));
286  __ push(scratch);
287  __ push(receiver);
288  __ push(holder);
289}
290
291
292static void CompileCallLoadPropertyWithInterceptor(
293    MacroAssembler* masm, Register receiver, Register holder, Register name,
294    Handle<JSObject> holder_obj, IC::UtilityId id) {
295  PushInterceptorArguments(masm, receiver, holder, name, holder_obj);
296  __ CallExternalReference(ExternalReference(IC_Utility(id), masm->isolate()),
297                           NamedLoadHandlerCompiler::kInterceptorArgsLength);
298}
299
300
301static void StoreIC_PushArgs(MacroAssembler* masm) {
302  Register receiver = StoreDescriptor::ReceiverRegister();
303  Register name = StoreDescriptor::NameRegister();
304  Register value = StoreDescriptor::ValueRegister();
305
306  DCHECK(!ebx.is(receiver) && !ebx.is(name) && !ebx.is(value));
307
308  __ pop(ebx);
309  __ push(receiver);
310  __ push(name);
311  __ push(value);
312  __ push(ebx);
313}
314
315
316void NamedStoreHandlerCompiler::GenerateSlow(MacroAssembler* masm) {
317  // Return address is on the stack.
318  StoreIC_PushArgs(masm);
319
320  // Do tail-call to runtime routine.
321  ExternalReference ref(IC_Utility(IC::kStoreIC_Slow), masm->isolate());
322  __ TailCallExternalReference(ref, 3, 1);
323}
324
325
326void ElementHandlerCompiler::GenerateStoreSlow(MacroAssembler* masm) {
327  // Return address is on the stack.
328  StoreIC_PushArgs(masm);
329
330  // Do tail-call to runtime routine.
331  ExternalReference ref(IC_Utility(IC::kKeyedStoreIC_Slow), masm->isolate());
332  __ TailCallExternalReference(ref, 3, 1);
333}
334
335
336#undef __
337#define __ ACCESS_MASM(masm())
338
339
340void NamedStoreHandlerCompiler::GenerateRestoreName(Label* label,
341                                                    Handle<Name> name) {
342  if (!label->is_unused()) {
343    __ bind(label);
344    __ mov(this->name(), Immediate(name));
345  }
346}
347
348
349void NamedStoreHandlerCompiler::GenerateRestoreName(Handle<Name> name) {
350  __ mov(this->name(), Immediate(name));
351}
352
353
354void NamedStoreHandlerCompiler::GenerateRestoreMap(Handle<Map> transition,
355                                                   Register scratch,
356                                                   Label* miss) {
357  Handle<WeakCell> cell = Map::WeakCellForMap(transition);
358  Register map_reg = StoreTransitionDescriptor::MapRegister();
359  DCHECK(!map_reg.is(scratch));
360  __ LoadWeakValue(map_reg, cell, miss);
361  if (transition->CanBeDeprecated()) {
362    __ mov(scratch, FieldOperand(map_reg, Map::kBitField3Offset));
363    __ and_(scratch, Immediate(Map::Deprecated::kMask));
364    __ j(not_zero, miss);
365  }
366}
367
368
369void NamedStoreHandlerCompiler::GenerateConstantCheck(Register map_reg,
370                                                      int descriptor,
371                                                      Register value_reg,
372                                                      Register scratch,
373                                                      Label* miss_label) {
374  DCHECK(!map_reg.is(scratch));
375  DCHECK(!map_reg.is(value_reg));
376  DCHECK(!value_reg.is(scratch));
377  __ LoadInstanceDescriptors(map_reg, scratch);
378  __ mov(scratch,
379         FieldOperand(scratch, DescriptorArray::GetValueOffset(descriptor)));
380  __ cmp(value_reg, scratch);
381  __ j(not_equal, miss_label);
382}
383
384
385void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(HeapType* field_type,
386                                                        Register value_reg,
387                                                        Label* miss_label) {
388  __ JumpIfSmi(value_reg, miss_label);
389  HeapType::Iterator<Map> it = field_type->Classes();
390  if (!it.Done()) {
391    Label do_store;
392    while (true) {
393      __ CompareMap(value_reg, it.Current());
394      it.Advance();
395      if (it.Done()) {
396        __ j(not_equal, miss_label);
397        break;
398      }
399      __ j(equal, &do_store, Label::kNear);
400    }
401    __ bind(&do_store);
402  }
403}
404
405
406Register PropertyHandlerCompiler::CheckPrototypes(
407    Register object_reg, Register holder_reg, Register scratch1,
408    Register scratch2, Handle<Name> name, Label* miss,
409    PrototypeCheckType check) {
410  Handle<Map> receiver_map(IC::TypeToMap(*type(), isolate()));
411
412  // Make sure there's no overlap between holder and object registers.
413  DCHECK(!scratch1.is(object_reg) && !scratch1.is(holder_reg));
414  DCHECK(!scratch2.is(object_reg) && !scratch2.is(holder_reg) &&
415         !scratch2.is(scratch1));
416
417  // Keep track of the current object in register reg.
418  Register reg = object_reg;
419  int depth = 0;
420
421  Handle<JSObject> current = Handle<JSObject>::null();
422  if (type()->IsConstant())
423    current = Handle<JSObject>::cast(type()->AsConstant()->Value());
424  Handle<JSObject> prototype = Handle<JSObject>::null();
425  Handle<Map> current_map = receiver_map;
426  Handle<Map> holder_map(holder()->map());
427  // Traverse the prototype chain and check the maps in the prototype chain for
428  // fast and global objects or do negative lookup for normal objects.
429  while (!current_map.is_identical_to(holder_map)) {
430    ++depth;
431
432    // Only global objects and objects that do not require access
433    // checks are allowed in stubs.
434    DCHECK(current_map->IsJSGlobalProxyMap() ||
435           !current_map->is_access_check_needed());
436
437    prototype = handle(JSObject::cast(current_map->prototype()));
438    if (current_map->is_dictionary_map() &&
439        !current_map->IsJSGlobalObjectMap()) {
440      DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.
441      if (!name->IsUniqueName()) {
442        DCHECK(name->IsString());
443        name = factory()->InternalizeString(Handle<String>::cast(name));
444      }
445      DCHECK(current.is_null() ||
446             current->property_dictionary()->FindEntry(name) ==
447                 NameDictionary::kNotFound);
448
449      GenerateDictionaryNegativeLookup(masm(), miss, reg, name, scratch1,
450                                       scratch2);
451
452      __ mov(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
453      reg = holder_reg;  // From now on the object will be in holder_reg.
454      __ mov(reg, FieldOperand(scratch1, Map::kPrototypeOffset));
455    } else {
456      Register map_reg = scratch1;
457      __ mov(map_reg, FieldOperand(reg, HeapObject::kMapOffset));
458      if (depth != 1 || check == CHECK_ALL_MAPS) {
459        Handle<WeakCell> cell = Map::WeakCellForMap(current_map);
460        __ CmpWeakValue(map_reg, cell, scratch2);
461        __ j(not_equal, miss);
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 (current_map->IsJSGlobalProxyMap()) {
471        __ CheckAccessGlobalProxy(reg, map_reg, scratch2, miss);
472        // Restore map_reg.
473        __ mov(map_reg, FieldOperand(reg, HeapObject::kMapOffset));
474      } else if (current_map->IsJSGlobalObjectMap()) {
475        GenerateCheckPropertyCell(masm(), Handle<JSGlobalObject>::cast(current),
476                                  name, scratch2, miss);
477      }
478      reg = holder_reg;  // From now on the object will be in holder_reg.
479      __ mov(reg, FieldOperand(map_reg, Map::kPrototypeOffset));
480    }
481
482    // Go to the next object in the prototype chain.
483    current = prototype;
484    current_map = handle(current->map());
485  }
486
487  // Log the check depth.
488  LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
489
490  if (depth != 0 || check == CHECK_ALL_MAPS) {
491    // Check the holder map.
492    __ mov(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
493    Handle<WeakCell> cell = Map::WeakCellForMap(current_map);
494    __ CmpWeakValue(scratch1, cell, scratch2);
495    __ j(not_equal, miss);
496  }
497
498  // Perform security check for access to the global object.
499  DCHECK(current_map->IsJSGlobalProxyMap() ||
500         !current_map->is_access_check_needed());
501  if (current_map->IsJSGlobalProxyMap()) {
502    __ CheckAccessGlobalProxy(reg, scratch1, scratch2, miss);
503  }
504
505  // Return the register containing the holder.
506  return reg;
507}
508
509
510void NamedLoadHandlerCompiler::FrontendFooter(Handle<Name> name, Label* miss) {
511  if (!miss->is_unused()) {
512    Label success;
513    __ jmp(&success);
514    __ bind(miss);
515    if (IC::ICUseVector(kind())) {
516      DCHECK(kind() == Code::LOAD_IC);
517      PopVectorAndSlot();
518    }
519    TailCallBuiltin(masm(), MissBuiltin(kind()));
520    __ bind(&success);
521  }
522}
523
524
525void NamedStoreHandlerCompiler::FrontendFooter(Handle<Name> name, Label* miss) {
526  if (!miss->is_unused()) {
527    Label success;
528    __ jmp(&success);
529    GenerateRestoreName(miss, name);
530    TailCallBuiltin(masm(), MissBuiltin(kind()));
531    __ bind(&success);
532  }
533}
534
535
536void NamedLoadHandlerCompiler::GenerateLoadCallback(
537    Register reg, Handle<ExecutableAccessorInfo> callback) {
538  // Insert additional parameters into the stack frame above return address.
539  DCHECK(!scratch3().is(reg));
540  __ pop(scratch3());  // Get return address to place it below.
541
542  STATIC_ASSERT(PropertyCallbackArguments::kHolderIndex == 0);
543  STATIC_ASSERT(PropertyCallbackArguments::kIsolateIndex == 1);
544  STATIC_ASSERT(PropertyCallbackArguments::kReturnValueDefaultValueIndex == 2);
545  STATIC_ASSERT(PropertyCallbackArguments::kReturnValueOffset == 3);
546  STATIC_ASSERT(PropertyCallbackArguments::kDataIndex == 4);
547  STATIC_ASSERT(PropertyCallbackArguments::kThisIndex == 5);
548  __ push(receiver());  // receiver
549  // Push data from ExecutableAccessorInfo.
550  if (isolate()->heap()->InNewSpace(callback->data())) {
551    DCHECK(!scratch2().is(reg));
552    __ mov(scratch2(), Immediate(callback));
553    __ push(FieldOperand(scratch2(), ExecutableAccessorInfo::kDataOffset));
554  } else {
555    __ push(Immediate(Handle<Object>(callback->data(), isolate())));
556  }
557  __ push(Immediate(isolate()->factory()->undefined_value()));  // ReturnValue
558  // ReturnValue default value
559  __ push(Immediate(isolate()->factory()->undefined_value()));
560  __ push(Immediate(reinterpret_cast<int>(isolate())));
561  __ push(reg);  // holder
562
563  // Save a pointer to where we pushed the arguments. This will be
564  // passed as the const PropertyAccessorInfo& to the C++ callback.
565  __ push(esp);
566
567  __ push(name());  // name
568
569  __ push(scratch3());  // Restore return address.
570
571  // Abi for CallApiGetter
572  Register getter_address = ApiGetterDescriptor::function_address();
573  Address function_address = v8::ToCData<Address>(callback->getter());
574  __ mov(getter_address, Immediate(function_address));
575
576  CallApiGetterStub stub(isolate());
577  __ TailCallStub(&stub);
578}
579
580
581void NamedLoadHandlerCompiler::GenerateLoadConstant(Handle<Object> value) {
582  // Return the constant value.
583  __ LoadObject(eax, value);
584  __ ret(0);
585}
586
587
588void NamedLoadHandlerCompiler::GenerateLoadInterceptorWithFollowup(
589    LookupIterator* it, Register holder_reg) {
590  DCHECK(holder()->HasNamedInterceptor());
591  DCHECK(!holder()->GetNamedInterceptor()->getter()->IsUndefined());
592
593  // Compile the interceptor call, followed by inline code to load the
594  // property from further up the prototype chain if the call fails.
595  // Check that the maps haven't changed.
596  DCHECK(holder_reg.is(receiver()) || holder_reg.is(scratch1()));
597
598  // Preserve the receiver register explicitly whenever it is different from the
599  // holder and it is needed should the interceptor return without any result.
600  // The ACCESSOR case needs the receiver to be passed into C++ code, the FIELD
601  // case might cause a miss during the prototype check.
602  bool must_perform_prototype_check =
603      !holder().is_identical_to(it->GetHolder<JSObject>());
604  bool must_preserve_receiver_reg =
605      !receiver().is(holder_reg) &&
606      (it->state() == LookupIterator::ACCESSOR || must_perform_prototype_check);
607
608  // Save necessary data before invoking an interceptor.
609  // Requires a frame to make GC aware of pushed pointers.
610  {
611    FrameScope frame_scope(masm(), StackFrame::INTERNAL);
612
613    if (must_preserve_receiver_reg) {
614      __ push(receiver());
615    }
616    __ push(holder_reg);
617    __ push(this->name());
618    InterceptorVectorSlotPush(holder_reg);
619    // Invoke an interceptor.  Note: map checks from receiver to
620    // interceptor's holder has been compiled before (see a caller
621    // of this method.)
622    CompileCallLoadPropertyWithInterceptor(
623        masm(), receiver(), holder_reg, this->name(), holder(),
624        IC::kLoadPropertyWithInterceptorOnly);
625
626    // Check if interceptor provided a value for property.  If it's
627    // the case, return immediately.
628    Label interceptor_failed;
629    __ cmp(eax, factory()->no_interceptor_result_sentinel());
630    __ j(equal, &interceptor_failed);
631    frame_scope.GenerateLeaveFrame();
632    __ ret(0);
633
634    // Clobber registers when generating debug-code to provoke errors.
635    __ bind(&interceptor_failed);
636    if (FLAG_debug_code) {
637      __ mov(receiver(), Immediate(bit_cast<int32_t>(kZapValue)));
638      __ mov(holder_reg, Immediate(bit_cast<int32_t>(kZapValue)));
639      __ mov(this->name(), Immediate(bit_cast<int32_t>(kZapValue)));
640    }
641
642    InterceptorVectorSlotPop(holder_reg);
643    __ pop(this->name());
644    __ pop(holder_reg);
645    if (must_preserve_receiver_reg) {
646      __ pop(receiver());
647    }
648
649    // Leave the internal frame.
650  }
651
652  GenerateLoadPostInterceptor(it, holder_reg);
653}
654
655
656void NamedLoadHandlerCompiler::GenerateLoadInterceptor(Register holder_reg) {
657  DCHECK(holder()->HasNamedInterceptor());
658  DCHECK(!holder()->GetNamedInterceptor()->getter()->IsUndefined());
659  // Call the runtime system to load the interceptor.
660  __ pop(scratch2());  // save old return address
661  PushInterceptorArguments(masm(), receiver(), holder_reg, this->name(),
662                           holder());
663  __ push(scratch2());  // restore old return address
664
665  ExternalReference ref = ExternalReference(
666      IC_Utility(IC::kLoadPropertyWithInterceptor), isolate());
667  __ TailCallExternalReference(
668      ref, NamedLoadHandlerCompiler::kInterceptorArgsLength, 1);
669}
670
671
672Handle<Code> NamedStoreHandlerCompiler::CompileStoreCallback(
673    Handle<JSObject> object, Handle<Name> name,
674    Handle<ExecutableAccessorInfo> callback) {
675  Register holder_reg = Frontend(name);
676
677  __ pop(scratch1());  // remove the return address
678  __ push(receiver());
679  __ push(holder_reg);
680  __ Push(callback);
681  __ Push(name);
682  __ push(value());
683  __ push(scratch1());  // restore return address
684
685  // Do tail-call to the runtime system.
686  ExternalReference store_callback_property =
687      ExternalReference(IC_Utility(IC::kStoreCallbackProperty), isolate());
688  __ TailCallExternalReference(store_callback_property, 5, 1);
689
690  // Return the generated code.
691  return GetCode(kind(), Code::FAST, name);
692}
693
694
695Handle<Code> NamedStoreHandlerCompiler::CompileStoreInterceptor(
696    Handle<Name> name) {
697  __ pop(scratch1());  // remove the return address
698  __ push(receiver());
699  __ push(this->name());
700  __ push(value());
701  __ push(scratch1());  // restore return address
702
703  // Do tail-call to the runtime system.
704  ExternalReference store_ic_property = ExternalReference(
705      IC_Utility(IC::kStorePropertyWithInterceptor), isolate());
706  __ TailCallExternalReference(store_ic_property, 3, 1);
707
708  // Return the generated code.
709  return GetCode(kind(), Code::FAST, name);
710}
711
712
713Register NamedStoreHandlerCompiler::value() {
714  return StoreDescriptor::ValueRegister();
715}
716
717
718Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
719    Handle<PropertyCell> cell, Handle<Name> name, bool is_configurable) {
720  Label miss;
721  if (IC::ICUseVector(kind())) {
722    PushVectorAndSlot();
723  }
724  FrontendHeader(receiver(), name, &miss);
725  // Get the value from the cell.
726  Register result = StoreDescriptor::ValueRegister();
727  Handle<WeakCell> weak_cell = factory()->NewWeakCell(cell);
728  __ LoadWeakValue(result, weak_cell, &miss);
729  __ mov(result, FieldOperand(result, PropertyCell::kValueOffset));
730
731  // Check for deleted property if property can actually be deleted.
732  if (is_configurable) {
733    __ cmp(result, factory()->the_hole_value());
734    __ j(equal, &miss);
735  } else if (FLAG_debug_code) {
736    __ cmp(result, factory()->the_hole_value());
737    __ Check(not_equal, kDontDeleteCellsCannotContainTheHole);
738  }
739
740  Counters* counters = isolate()->counters();
741  __ IncrementCounter(counters->named_load_global_stub(), 1);
742  // The code above already loads the result into the return register.
743  if (IC::ICUseVector(kind())) {
744    DiscardVectorAndSlot();
745  }
746  __ ret(0);
747
748  FrontendFooter(name, &miss);
749
750  // Return the generated code.
751  return GetCode(kind(), Code::NORMAL, name);
752}
753
754
755#undef __
756}
757}  // namespace v8::internal
758
759#endif  // V8_TARGET_ARCH_X87
760