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  STATIC_ASSERT(LoadWithVectorDescriptor::kSlot <
63                LoadWithVectorDescriptor::kVector);
64  STATIC_ASSERT(StoreWithVectorDescriptor::kSlot <
65                StoreWithVectorDescriptor::kVector);
66  STATIC_ASSERT(StoreTransitionDescriptor::kSlot <
67                StoreTransitionDescriptor::kVector);
68  __ push(slot);
69  __ push(vector);
70}
71
72
73void PropertyHandlerCompiler::PopVectorAndSlot(Register vector, Register slot) {
74  MacroAssembler* masm = this->masm();
75  __ pop(vector);
76  __ pop(slot);
77}
78
79
80void PropertyHandlerCompiler::DiscardVectorAndSlot() {
81  MacroAssembler* masm = this->masm();
82  // Remove vector and slot.
83  __ add(esp, Immediate(2 * kPointerSize));
84}
85
86void PropertyHandlerCompiler::PushReturnAddress(Register tmp) {
87  MacroAssembler* masm = this->masm();
88  __ push(tmp);
89}
90
91void PropertyHandlerCompiler::PopReturnAddress(Register tmp) {
92  MacroAssembler* masm = this->masm();
93  __ pop(tmp);
94}
95
96void PropertyHandlerCompiler::GenerateDictionaryNegativeLookup(
97    MacroAssembler* masm, Label* miss_label, Register receiver,
98    Handle<Name> name, Register scratch0, Register scratch1) {
99  DCHECK(name->IsUniqueName());
100  DCHECK(!receiver.is(scratch0));
101  Counters* counters = masm->isolate()->counters();
102  __ IncrementCounter(counters->negative_lookups(), 1);
103  __ IncrementCounter(counters->negative_lookups_miss(), 1);
104
105  __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
106
107  const int kInterceptorOrAccessCheckNeededMask =
108      (1 << Map::kHasNamedInterceptor) | (1 << Map::kIsAccessCheckNeeded);
109
110  // Bail out if the receiver has a named interceptor or requires access checks.
111  __ test_b(FieldOperand(scratch0, Map::kBitFieldOffset),
112            Immediate(kInterceptorOrAccessCheckNeededMask));
113  __ j(not_zero, miss_label);
114
115  // Check that receiver is a JSObject.
116  __ CmpInstanceType(scratch0, FIRST_JS_RECEIVER_TYPE);
117  __ j(below, miss_label);
118
119  // Load properties array.
120  Register properties = scratch0;
121  __ mov(properties, FieldOperand(receiver, JSObject::kPropertiesOffset));
122
123  // Check that the properties array is a dictionary.
124  __ cmp(FieldOperand(properties, HeapObject::kMapOffset),
125         Immediate(masm->isolate()->factory()->hash_table_map()));
126  __ j(not_equal, miss_label);
127
128  Label done;
129  NameDictionaryLookupStub::GenerateNegativeLookup(masm, miss_label, &done,
130                                                   properties, name, scratch1);
131  __ bind(&done);
132  __ DecrementCounter(counters->negative_lookups_miss(), 1);
133}
134
135
136void NamedLoadHandlerCompiler::GenerateDirectLoadGlobalFunctionPrototype(
137    MacroAssembler* masm, int index, Register result, Label* miss) {
138  __ LoadGlobalFunction(index, result);
139  // Load its initial map. The global functions all have initial maps.
140  __ mov(result,
141         FieldOperand(result, JSFunction::kPrototypeOrInitialMapOffset));
142  // Load the prototype from the initial map.
143  __ mov(result, FieldOperand(result, Map::kPrototypeOffset));
144}
145
146
147void NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(
148    MacroAssembler* masm, Register receiver, Register scratch1,
149    Register scratch2, Label* miss_label) {
150  // TODO(mvstanton): This isn't used on ia32. Move all the other
151  // platform implementations into a code stub so this method can be removed.
152  UNREACHABLE();
153}
154
155
156// Generate call to api function.
157// This function uses push() to generate smaller, faster code than
158// the version above. It is an optimization that should will be removed
159// when api call ICs are generated in hydrogen.
160void PropertyHandlerCompiler::GenerateApiAccessorCall(
161    MacroAssembler* masm, const CallOptimization& optimization,
162    Handle<Map> receiver_map, Register receiver, Register scratch,
163    bool is_store, Register store_parameter, Register accessor_holder,
164    int accessor_index) {
165  DCHECK(!accessor_holder.is(scratch));
166  // Copy return value.
167  __ pop(scratch);
168
169  if (is_store) {
170    // Discard stack arguments.
171    __ add(esp, Immediate(StoreWithVectorDescriptor::kStackArgumentsCount *
172                          kPointerSize));
173  }
174  // Write the receiver and arguments to stack frame.
175  __ push(receiver);
176  if (is_store) {
177    DCHECK(!AreAliased(receiver, scratch, store_parameter));
178    __ push(store_parameter);
179  }
180  __ push(scratch);
181  // Stack now matches JSFunction abi.
182  DCHECK(optimization.is_simple_api_call());
183
184  // Abi for CallApiCallbackStub.
185  Register callee = edi;
186  Register data = ebx;
187  Register holder = ecx;
188  Register api_function_address = edx;
189  scratch = no_reg;
190
191  // Put callee in place.
192  __ LoadAccessor(callee, accessor_holder, accessor_index,
193                  is_store ? ACCESSOR_SETTER : ACCESSOR_GETTER);
194
195  // Put holder in place.
196  CallOptimization::HolderLookup holder_lookup;
197  int holder_depth = 0;
198  optimization.LookupHolderOfExpectedType(receiver_map, &holder_lookup,
199                                          &holder_depth);
200  switch (holder_lookup) {
201    case CallOptimization::kHolderIsReceiver:
202      __ Move(holder, receiver);
203      break;
204    case CallOptimization::kHolderFound:
205      __ mov(holder, FieldOperand(receiver, HeapObject::kMapOffset));
206      __ mov(holder, FieldOperand(holder, Map::kPrototypeOffset));
207      for (int i = 1; i < holder_depth; i++) {
208        __ mov(holder, FieldOperand(holder, HeapObject::kMapOffset));
209        __ mov(holder, FieldOperand(holder, Map::kPrototypeOffset));
210      }
211      break;
212    case CallOptimization::kHolderNotFound:
213      UNREACHABLE();
214      break;
215  }
216
217  Isolate* isolate = masm->isolate();
218  Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
219  bool call_data_undefined = false;
220  // Put call data in place.
221  if (api_call_info->data()->IsUndefined(isolate)) {
222    call_data_undefined = true;
223    __ mov(data, Immediate(isolate->factory()->undefined_value()));
224  } else {
225    if (optimization.is_constant_call()) {
226      __ mov(data, FieldOperand(callee, JSFunction::kSharedFunctionInfoOffset));
227      __ mov(data, FieldOperand(data, SharedFunctionInfo::kFunctionDataOffset));
228      __ mov(data, FieldOperand(data, FunctionTemplateInfo::kCallCodeOffset));
229    } else {
230      __ mov(data, FieldOperand(callee, FunctionTemplateInfo::kCallCodeOffset));
231    }
232    __ mov(data, FieldOperand(data, CallHandlerInfo::kDataOffset));
233  }
234
235  if (api_call_info->fast_handler()->IsCode()) {
236    // Just tail call into the code.
237    __ Jump(handle(Code::cast(api_call_info->fast_handler())),
238            RelocInfo::CODE_TARGET);
239    return;
240  }
241  // Put api_function_address in place.
242  Address function_address = v8::ToCData<Address>(api_call_info->callback());
243  __ mov(api_function_address, Immediate(function_address));
244
245  // Jump to stub.
246  CallApiCallbackStub stub(isolate, is_store, call_data_undefined,
247                           !optimization.is_constant_call());
248  __ TailCallStub(&stub);
249}
250
251
252// Generate code to check that a global property cell is empty. Create
253// the property cell at compilation time if no cell exists for the
254// property.
255void PropertyHandlerCompiler::GenerateCheckPropertyCell(
256    MacroAssembler* masm, Handle<JSGlobalObject> global, Handle<Name> name,
257    Register scratch, Label* miss) {
258  Handle<PropertyCell> cell = JSGlobalObject::EnsureEmptyPropertyCell(
259      global, name, PropertyCellType::kInvalidated);
260  Isolate* isolate = masm->isolate();
261  DCHECK(cell->value()->IsTheHole(isolate));
262  Handle<WeakCell> weak_cell = isolate->factory()->NewWeakCell(cell);
263  __ LoadWeakValue(scratch, weak_cell, miss);
264  __ cmp(FieldOperand(scratch, PropertyCell::kValueOffset),
265         Immediate(isolate->factory()->the_hole_value()));
266  __ j(not_equal, miss);
267}
268
269
270void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
271    MacroAssembler* masm, Handle<Map> map, Register receiver, Register holder,
272    int accessor_index, int expected_arguments, Register scratch) {
273  // ----------- S t a t e -------------
274  //  -- esp[12] : value
275  //  -- esp[8]  : slot
276  //  -- esp[4]  : vector
277  //  -- esp[0]  : return address
278  // -----------------------------------
279  __ LoadParameterFromStack<Descriptor>(value(), Descriptor::kValue);
280
281  {
282    FrameScope scope(masm, StackFrame::INTERNAL);
283
284    // Save context register
285    __ push(esi);
286    // Save value register, so we can restore it later.
287    __ push(value());
288
289    if (accessor_index >= 0) {
290      DCHECK(!holder.is(scratch));
291      DCHECK(!receiver.is(scratch));
292      DCHECK(!value().is(scratch));
293      // Call the JavaScript setter with receiver and value on the stack.
294      if (map->IsJSGlobalObjectMap()) {
295        __ mov(scratch,
296               FieldOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
297        receiver = scratch;
298      }
299      __ push(receiver);
300      __ push(value());
301      __ LoadAccessor(edi, holder, accessor_index, ACCESSOR_SETTER);
302      __ Set(eax, 1);
303      __ Call(masm->isolate()->builtins()->CallFunction(
304                  ConvertReceiverMode::kNotNullOrUndefined),
305              RelocInfo::CODE_TARGET);
306    } else {
307      // If we generate a global code snippet for deoptimization only, remember
308      // the place to continue after deoptimization.
309      masm->isolate()->heap()->SetSetterStubDeoptPCOffset(masm->pc_offset());
310    }
311
312    // We have to return the passed value, not the return value of the setter.
313    __ pop(eax);
314    // Restore context register.
315    __ pop(esi);
316  }
317  if (accessor_index >= 0) {
318    __ ret(StoreWithVectorDescriptor::kStackArgumentsCount * kPointerSize);
319  } else {
320    // If we generate a global code snippet for deoptimization only, don't try
321    // to drop stack arguments for the StoreIC because they are not a part of
322    // expression stack and deoptimizer does not reconstruct them.
323    __ ret(0);
324  }
325}
326
327
328static void PushInterceptorArguments(MacroAssembler* masm, Register receiver,
329                                     Register holder, Register name,
330                                     Handle<JSObject> holder_obj) {
331  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsNameIndex == 0);
332  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsThisIndex == 1);
333  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsHolderIndex == 2);
334  STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsLength == 3);
335  __ push(name);
336  __ push(receiver);
337  __ push(holder);
338}
339
340
341static void CompileCallLoadPropertyWithInterceptor(
342    MacroAssembler* masm, Register receiver, Register holder, Register name,
343    Handle<JSObject> holder_obj, Runtime::FunctionId id) {
344  DCHECK(NamedLoadHandlerCompiler::kInterceptorArgsLength ==
345         Runtime::FunctionForId(id)->nargs);
346  PushInterceptorArguments(masm, receiver, holder, name, holder_obj);
347  __ CallRuntime(id);
348}
349
350#undef __
351#define __ ACCESS_MASM(masm())
352
353
354void NamedStoreHandlerCompiler::GenerateRestoreName(Label* label,
355                                                    Handle<Name> name) {
356  if (!label->is_unused()) {
357    __ bind(label);
358    __ mov(this->name(), Immediate(name));
359  }
360}
361
362
363void NamedStoreHandlerCompiler::GenerateRestoreName(Handle<Name> name) {
364  __ mov(this->name(), Immediate(name));
365}
366
367
368void NamedStoreHandlerCompiler::GenerateRestoreMap(Handle<Map> transition,
369                                                   Register map_reg,
370                                                   Register scratch,
371                                                   Label* miss) {
372  Handle<WeakCell> cell = Map::WeakCellForMap(transition);
373  DCHECK(!map_reg.is(scratch));
374  __ LoadWeakValue(map_reg, cell, miss);
375  if (transition->CanBeDeprecated()) {
376    __ mov(scratch, FieldOperand(map_reg, Map::kBitField3Offset));
377    __ and_(scratch, Immediate(Map::Deprecated::kMask));
378    __ j(not_zero, miss);
379  }
380}
381
382
383void NamedStoreHandlerCompiler::GenerateConstantCheck(Register map_reg,
384                                                      int descriptor,
385                                                      Register value_reg,
386                                                      Register scratch,
387                                                      Label* miss_label) {
388  DCHECK(!map_reg.is(scratch));
389  DCHECK(!map_reg.is(value_reg));
390  DCHECK(!value_reg.is(scratch));
391  __ LoadInstanceDescriptors(map_reg, scratch);
392  __ mov(scratch,
393         FieldOperand(scratch, DescriptorArray::GetValueOffset(descriptor)));
394  __ cmp(value_reg, scratch);
395  __ j(not_equal, miss_label);
396}
397
398void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(FieldType* field_type,
399                                                        Register value_reg,
400                                                        Label* miss_label) {
401  Register map_reg = scratch1();
402  Register scratch = scratch2();
403  DCHECK(!value_reg.is(map_reg));
404  DCHECK(!value_reg.is(scratch));
405  __ JumpIfSmi(value_reg, miss_label);
406  if (field_type->IsClass()) {
407    __ mov(map_reg, FieldOperand(value_reg, HeapObject::kMapOffset));
408    __ CmpWeakValue(map_reg, Map::WeakCellForMap(field_type->AsClass()),
409                    scratch);
410    __ j(not_equal, miss_label);
411  }
412}
413
414void PropertyHandlerCompiler::GenerateAccessCheck(
415    Handle<WeakCell> native_context_cell, Register scratch1, Register scratch2,
416    Label* miss, bool compare_native_contexts_only) {
417  Label done;
418  // Load current native context.
419  __ mov(scratch1, NativeContextOperand());
420  // Load expected native context.
421  __ LoadWeakValue(scratch2, native_context_cell, miss);
422  __ cmp(scratch1, scratch2);
423
424  if (!compare_native_contexts_only) {
425    __ j(equal, &done);
426
427    // Compare security tokens of current and expected native contexts.
428    __ mov(scratch1, ContextOperand(scratch1, Context::SECURITY_TOKEN_INDEX));
429    __ mov(scratch2, ContextOperand(scratch2, Context::SECURITY_TOKEN_INDEX));
430    __ cmp(scratch1, scratch2);
431  }
432  __ j(not_equal, miss);
433
434  __ bind(&done);
435}
436
437Register PropertyHandlerCompiler::CheckPrototypes(
438    Register object_reg, Register holder_reg, Register scratch1,
439    Register scratch2, Handle<Name> name, Label* miss,
440    ReturnHolder return_what) {
441  Handle<Map> receiver_map = map();
442
443  // Make sure there's no overlap between holder and object registers.
444  DCHECK(!scratch1.is(object_reg) && !scratch1.is(holder_reg));
445  DCHECK(!scratch2.is(object_reg) && !scratch2.is(holder_reg) &&
446         !scratch2.is(scratch1));
447
448  Handle<Cell> validity_cell =
449      Map::GetOrCreatePrototypeChainValidityCell(receiver_map, isolate());
450  if (!validity_cell.is_null()) {
451    DCHECK_EQ(Smi::FromInt(Map::kPrototypeChainValid), validity_cell->value());
452    // Operand::ForCell(...) points to the cell's payload!
453    __ cmp(Operand::ForCell(validity_cell),
454           Immediate(Smi::FromInt(Map::kPrototypeChainValid)));
455    __ j(not_equal, miss);
456  }
457
458  // Keep track of the current object in register reg.
459  Register reg = object_reg;
460  int depth = 0;
461
462  Handle<JSObject> current = Handle<JSObject>::null();
463  if (receiver_map->IsJSGlobalObjectMap()) {
464    current = isolate()->global_object();
465  }
466
467  Handle<Map> current_map(receiver_map->GetPrototypeChainRootMap(isolate()),
468                          isolate());
469  Handle<Map> holder_map(holder()->map());
470  // Traverse the prototype chain and check the maps in the prototype chain for
471  // fast and global objects or do negative lookup for normal objects.
472  while (!current_map.is_identical_to(holder_map)) {
473    ++depth;
474
475    if (current_map->IsJSGlobalObjectMap()) {
476      GenerateCheckPropertyCell(masm(), Handle<JSGlobalObject>::cast(current),
477                                name, scratch2, miss);
478    } else if (current_map->is_dictionary_map()) {
479      DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.
480      DCHECK(name->IsUniqueName());
481      DCHECK(current.is_null() ||
482             current->property_dictionary()->FindEntry(name) ==
483                 NameDictionary::kNotFound);
484
485      if (depth > 1) {
486        Handle<WeakCell> weak_cell =
487            Map::GetOrCreatePrototypeWeakCell(current, isolate());
488        __ LoadWeakValue(reg, weak_cell, miss);
489      }
490      GenerateDictionaryNegativeLookup(masm(), miss, reg, name, scratch1,
491                                       scratch2);
492    }
493
494    reg = holder_reg;  // From now on the object will be in holder_reg.
495    // Go to the next object in the prototype chain.
496    current = handle(JSObject::cast(current_map->prototype()));
497    current_map = handle(current->map());
498  }
499
500  DCHECK(!current_map->IsJSGlobalProxyMap());
501
502  // Log the check depth.
503  LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
504
505  bool return_holder = return_what == RETURN_HOLDER;
506  if (return_holder && depth != 0) {
507    Handle<WeakCell> weak_cell =
508        Map::GetOrCreatePrototypeWeakCell(current, isolate());
509    __ LoadWeakValue(reg, weak_cell, miss);
510  }
511
512  // Return the register containing the holder.
513  return return_holder ? reg : no_reg;
514}
515
516
517void NamedLoadHandlerCompiler::FrontendFooter(Handle<Name> name, Label* miss) {
518  if (!miss->is_unused()) {
519    Label success;
520    __ jmp(&success);
521    __ bind(miss);
522    if (IC::ShouldPushPopSlotAndVector(kind())) {
523      DCHECK(kind() == Code::LOAD_IC);
524      PopVectorAndSlot();
525    }
526    TailCallBuiltin(masm(), MissBuiltin(kind()));
527    __ bind(&success);
528  }
529}
530
531
532void NamedStoreHandlerCompiler::FrontendFooter(Handle<Name> name, Label* miss) {
533  if (!miss->is_unused()) {
534    Label success;
535    __ jmp(&success);
536    GenerateRestoreName(miss, name);
537    DCHECK(!IC::ShouldPushPopSlotAndVector(kind()));
538    TailCallBuiltin(masm(), MissBuiltin(kind()));
539    __ bind(&success);
540  }
541}
542
543
544void NamedLoadHandlerCompiler::GenerateLoadConstant(Handle<Object> value) {
545  // Return the constant value.
546  __ LoadObject(eax, value);
547  __ ret(0);
548}
549
550
551void NamedLoadHandlerCompiler::GenerateLoadInterceptorWithFollowup(
552    LookupIterator* it, Register holder_reg) {
553  DCHECK(holder()->HasNamedInterceptor());
554  DCHECK(!holder()->GetNamedInterceptor()->getter()->IsUndefined(isolate()));
555
556  // Compile the interceptor call, followed by inline code to load the
557  // property from further up the prototype chain if the call fails.
558  // Check that the maps haven't changed.
559  DCHECK(holder_reg.is(receiver()) || holder_reg.is(scratch1()));
560
561  // Preserve the receiver register explicitly whenever it is different from the
562  // holder and it is needed should the interceptor return without any result.
563  // The ACCESSOR case needs the receiver to be passed into C++ code, the FIELD
564  // case might cause a miss during the prototype check.
565  bool must_perform_prototype_check =
566      !holder().is_identical_to(it->GetHolder<JSObject>());
567  bool must_preserve_receiver_reg =
568      !receiver().is(holder_reg) &&
569      (it->state() == LookupIterator::ACCESSOR || must_perform_prototype_check);
570
571  // Save necessary data before invoking an interceptor.
572  // Requires a frame to make GC aware of pushed pointers.
573  {
574    FrameScope frame_scope(masm(), StackFrame::INTERNAL);
575
576    if (must_preserve_receiver_reg) {
577      __ push(receiver());
578    }
579    __ push(holder_reg);
580    __ push(this->name());
581    InterceptorVectorSlotPush(holder_reg);
582    // Invoke an interceptor.  Note: map checks from receiver to
583    // interceptor's holder has been compiled before (see a caller
584    // of this method.)
585    CompileCallLoadPropertyWithInterceptor(
586        masm(), receiver(), holder_reg, this->name(), holder(),
587        Runtime::kLoadPropertyWithInterceptorOnly);
588
589    // Check if interceptor provided a value for property.  If it's
590    // the case, return immediately.
591    Label interceptor_failed;
592    __ cmp(eax, factory()->no_interceptor_result_sentinel());
593    __ j(equal, &interceptor_failed);
594    frame_scope.GenerateLeaveFrame();
595    __ ret(0);
596
597    // Clobber registers when generating debug-code to provoke errors.
598    __ bind(&interceptor_failed);
599    if (FLAG_debug_code) {
600      __ mov(receiver(), Immediate(bit_cast<int32_t>(kZapValue)));
601      __ mov(holder_reg, Immediate(bit_cast<int32_t>(kZapValue)));
602      __ mov(this->name(), Immediate(bit_cast<int32_t>(kZapValue)));
603    }
604
605    InterceptorVectorSlotPop(holder_reg);
606    __ pop(this->name());
607    __ pop(holder_reg);
608    if (must_preserve_receiver_reg) {
609      __ pop(receiver());
610    }
611
612    // Leave the internal frame.
613  }
614
615  GenerateLoadPostInterceptor(it, holder_reg);
616}
617
618
619void NamedLoadHandlerCompiler::GenerateLoadInterceptor(Register holder_reg) {
620  DCHECK(holder()->HasNamedInterceptor());
621  DCHECK(!holder()->GetNamedInterceptor()->getter()->IsUndefined(isolate()));
622  // Call the runtime system to load the interceptor.
623  __ pop(scratch2());  // save old return address
624  PushInterceptorArguments(masm(), receiver(), holder_reg, this->name(),
625                           holder());
626  __ push(scratch2());  // restore old return address
627
628  __ TailCallRuntime(Runtime::kLoadPropertyWithInterceptor);
629}
630
631void NamedStoreHandlerCompiler::ZapStackArgumentsRegisterAliases() {
632  // Zap register aliases of the arguments passed on the stack to ensure they
633  // are properly loaded by the handler (debug-only).
634  STATIC_ASSERT(Descriptor::kPassLastArgsOnStack);
635  STATIC_ASSERT(Descriptor::kStackArgumentsCount == 3);
636  __ mov(Descriptor::ValueRegister(), Immediate(kDebugZapValue));
637  __ mov(Descriptor::SlotRegister(), Immediate(kDebugZapValue));
638  __ mov(Descriptor::VectorRegister(), Immediate(kDebugZapValue));
639}
640
641Handle<Code> NamedStoreHandlerCompiler::CompileStoreCallback(
642    Handle<JSObject> object, Handle<Name> name, Handle<AccessorInfo> callback,
643    LanguageMode language_mode) {
644  Register holder_reg = Frontend(name);
645  __ LoadParameterFromStack<Descriptor>(value(), Descriptor::kValue);
646
647  __ pop(scratch1());  // remove the return address
648  // Discard stack arguments.
649  __ add(esp, Immediate(StoreWithVectorDescriptor::kStackArgumentsCount *
650                        kPointerSize));
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::ShouldPushPopSlotAndVector(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::ShouldPushPopSlotAndVector(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