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Issue 1178903003: Add script context with context-allocated "const this" (Closed) Base URL: https://chromium.googlesource.com/v8/v8@master
Patch Set: Add test Created 5 years, 6 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "src/v8.h" 5 #include "src/v8.h"
6 6
7 #if V8_TARGET_ARCH_MIPS64 7 #if V8_TARGET_ARCH_MIPS64
8 8
9 // Note on Mips implementation: 9 // Note on Mips implementation:
10 // 10 //
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3074 // by the vector above. 3074 // by the vector above.
3075 CallIC(ic); 3075 CallIC(ic);
3076 RecordJSReturnSite(expr); 3076 RecordJSReturnSite(expr);
3077 // Restore context register. 3077 // Restore context register.
3078 __ ld(cp, MemOperand(fp, StandardFrameConstants::kContextOffset)); 3078 __ ld(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
3079 context()->DropAndPlug(1, v0); 3079 context()->DropAndPlug(1, v0);
3080 } 3080 }
3081 3081
3082 3082
3083 void FullCodeGenerator::EmitResolvePossiblyDirectEval(int arg_count) { 3083 void FullCodeGenerator::EmitResolvePossiblyDirectEval(int arg_count) {
3084 // a7: copy of the first argument or undefined if it doesn't exist. 3084 // a6: copy of the first argument or undefined if it doesn't exist.
3085 if (arg_count > 0) { 3085 if (arg_count > 0) {
3086 __ ld(a7, MemOperand(sp, arg_count * kPointerSize)); 3086 __ ld(a6, MemOperand(sp, arg_count * kPointerSize));
3087 } else { 3087 } else {
3088 __ LoadRoot(a7, Heap::kUndefinedValueRootIndex); 3088 __ LoadRoot(a6, Heap::kUndefinedValueRootIndex);
3089 } 3089 }
3090 3090
3091 // a6: the receiver of the enclosing function.
3092 __ ld(a6, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
3093
3094 // a5: the receiver of the enclosing function. 3091 // a5: the receiver of the enclosing function.
3095 Variable* this_var = scope()->LookupThis(); 3092 __ ld(a5, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
3096 DCHECK_NOT_NULL(this_var);
3097 __ ld(a5, VarOperand(this_var, a5));
3098 3093
3099 // a4: the language mode. 3094 // a4: the language mode.
3100 __ li(a4, Operand(Smi::FromInt(language_mode()))); 3095 __ li(a4, Operand(Smi::FromInt(language_mode())));
3101 3096
3102 // a1: the start position of the scope the calls resides in. 3097 // a1: the start position of the scope the calls resides in.
3103 __ li(a1, Operand(Smi::FromInt(scope()->start_position()))); 3098 __ li(a1, Operand(Smi::FromInt(scope()->start_position())));
3104 3099
3105 // Do the runtime call. 3100 // Do the runtime call.
3106 __ Push(a7);
3107 __ Push(a6, a5, a4, a1); 3101 __ Push(a6, a5, a4, a1);
3108 __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 6); 3102 __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 5);
3109 } 3103 }
3110 3104
3111 3105
3112 void FullCodeGenerator::EmitInitializeThisAfterSuper( 3106 void FullCodeGenerator::EmitInitializeThisAfterSuper(
3113 SuperCallReference* super_ref, FeedbackVectorICSlot slot) { 3107 SuperCallReference* super_ref, FeedbackVectorICSlot slot) {
3114 Variable* this_var = super_ref->this_var()->var(); 3108 Variable* this_var = super_ref->this_var()->var();
3115 GetVar(a1, this_var); 3109 GetVar(a1, this_var);
3116 __ LoadRoot(at, Heap::kTheHoleValueRootIndex); 3110 __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
3117 Label uninitialized_this; 3111 Label uninitialized_this;
3118 __ Branch(&uninitialized_this, eq, a1, Operand(at)); 3112 __ Branch(&uninitialized_this, eq, a1, Operand(at));
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3131 // through this function. Avoid early returns. 3125 // through this function. Avoid early returns.
3132 expr->return_is_recorded_ = false; 3126 expr->return_is_recorded_ = false;
3133 #endif 3127 #endif
3134 3128
3135 Comment cmnt(masm_, "[ Call"); 3129 Comment cmnt(masm_, "[ Call");
3136 Expression* callee = expr->expression(); 3130 Expression* callee = expr->expression();
3137 Call::CallType call_type = expr->GetCallType(isolate()); 3131 Call::CallType call_type = expr->GetCallType(isolate());
3138 3132
3139 if (call_type == Call::POSSIBLY_EVAL_CALL) { 3133 if (call_type == Call::POSSIBLY_EVAL_CALL) {
3140 // In a call to eval, we first call RuntimeHidden_ResolvePossiblyDirectEval 3134 // In a call to eval, we first call RuntimeHidden_ResolvePossiblyDirectEval
3141 // to resolve the function we need to call and the receiver of the 3135 // to resolve the function we need to call. Then we call the resolved
3142 // call. Then we call the resolved function using the given 3136 // function using the given arguments.
3143 // arguments.
3144 ZoneList<Expression*>* args = expr->arguments(); 3137 ZoneList<Expression*>* args = expr->arguments();
3145 int arg_count = args->length(); 3138 int arg_count = args->length();
3146 3139
3147 { PreservePositionScope pos_scope(masm()->positions_recorder()); 3140 { PreservePositionScope pos_scope(masm()->positions_recorder());
3148 VisitForStackValue(callee); 3141 VisitForStackValue(callee);
3149 __ LoadRoot(a2, Heap::kUndefinedValueRootIndex); 3142 __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
3150 __ push(a2); // Reserved receiver slot. 3143 __ push(a2); // Reserved receiver slot.
3151 3144
3152 // Push the arguments. 3145 // Push the arguments.
3153 for (int i = 0; i < arg_count; i++) { 3146 for (int i = 0; i < arg_count; i++) {
3154 VisitForStackValue(args->at(i)); 3147 VisitForStackValue(args->at(i));
3155 } 3148 }
3156 3149
3157 // Push a copy of the function (found below the arguments) and 3150 // Push a copy of the function (found below the arguments) and
3158 // resolve eval. 3151 // resolve eval.
3159 __ ld(a1, MemOperand(sp, (arg_count + 1) * kPointerSize)); 3152 __ ld(a1, MemOperand(sp, (arg_count + 1) * kPointerSize));
3160 __ push(a1); 3153 __ push(a1);
3161 EmitResolvePossiblyDirectEval(arg_count); 3154 EmitResolvePossiblyDirectEval(arg_count);
3162 3155
3163 // The runtime call returns a pair of values in v0 (function) and 3156 // Touch up the stack with the resolved function.
3164 // v1 (receiver). Touch up the stack with the right values.
3165 __ sd(v0, MemOperand(sp, (arg_count + 1) * kPointerSize)); 3157 __ sd(v0, MemOperand(sp, (arg_count + 1) * kPointerSize));
3166 __ sd(v1, MemOperand(sp, arg_count * kPointerSize));
3167 3158
3168 PrepareForBailoutForId(expr->EvalOrLookupId(), NO_REGISTERS); 3159 PrepareForBailoutForId(expr->EvalOrLookupId(), NO_REGISTERS);
3169 } 3160 }
3170 // Record source position for debugger. 3161 // Record source position for debugger.
3171 SetSourcePosition(expr->position()); 3162 SetSourcePosition(expr->position());
3172 CallFunctionStub stub(isolate(), arg_count, NO_CALL_FUNCTION_FLAGS); 3163 CallFunctionStub stub(isolate(), arg_count, NO_CALL_FUNCTION_FLAGS);
3173 __ ld(a1, MemOperand(sp, (arg_count + 1) * kPointerSize)); 3164 __ ld(a1, MemOperand(sp, (arg_count + 1) * kPointerSize));
3174 __ CallStub(&stub); 3165 __ CallStub(&stub);
3175 RecordJSReturnSite(expr); 3166 RecordJSReturnSite(expr);
3176 // Restore context register. 3167 // Restore context register.
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4786 4777
4787 if (property != NULL) { 4778 if (property != NULL) {
4788 VisitForStackValue(property->obj()); 4779 VisitForStackValue(property->obj());
4789 VisitForStackValue(property->key()); 4780 VisitForStackValue(property->key());
4790 __ li(a1, Operand(Smi::FromInt(language_mode()))); 4781 __ li(a1, Operand(Smi::FromInt(language_mode())));
4791 __ push(a1); 4782 __ push(a1);
4792 __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION); 4783 __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
4793 context()->Plug(v0); 4784 context()->Plug(v0);
4794 } else if (proxy != NULL) { 4785 } else if (proxy != NULL) {
4795 Variable* var = proxy->var(); 4786 Variable* var = proxy->var();
4796 // Delete of an unqualified identifier is disallowed in strict mode 4787 // Delete of an unqualified identifier is disallowed in strict mode but
4797 // but "delete this" is allowed. 4788 // "delete this" is allowed.
4798 DCHECK(is_sloppy(language_mode()) || var->is_this()); 4789 bool is_this = var->HasThisName(isolate());
4790 DCHECK(is_sloppy(language_mode()) || is_this);
4799 if (var->IsUnallocated()) { 4791 if (var->IsUnallocated()) {
4800 __ ld(a2, GlobalObjectOperand()); 4792 __ ld(a2, GlobalObjectOperand());
4801 __ li(a1, Operand(var->name())); 4793 __ li(a1, Operand(var->name()));
4802 __ li(a0, Operand(Smi::FromInt(SLOPPY))); 4794 __ li(a0, Operand(Smi::FromInt(SLOPPY)));
4803 __ Push(a2, a1, a0); 4795 __ Push(a2, a1, a0);
4804 __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION); 4796 __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
4805 context()->Plug(v0); 4797 context()->Plug(v0);
4806 } else if (var->IsStackAllocated() || var->IsContextSlot()) { 4798 } else if (var->IsStackAllocated() || var->IsContextSlot()) {
4807 // Result of deleting non-global, non-dynamic variables is false. 4799 // Result of deleting non-global, non-dynamic variables is false.
4808 // The subexpression does not have side effects. 4800 // The subexpression does not have side effects.
4809 context()->Plug(var->is_this()); 4801 context()->Plug(is_this);
4810 } else { 4802 } else {
4811 // Non-global variable. Call the runtime to try to delete from the 4803 // Non-global variable. Call the runtime to try to delete from the
4812 // context where the variable was introduced. 4804 // context where the variable was introduced.
4813 DCHECK(!context_register().is(a2)); 4805 DCHECK(!context_register().is(a2));
4814 __ li(a2, Operand(var->name())); 4806 __ li(a2, Operand(var->name()));
4815 __ Push(context_register(), a2); 4807 __ Push(context_register(), a2);
4816 __ CallRuntime(Runtime::kDeleteLookupSlot, 2); 4808 __ CallRuntime(Runtime::kDeleteLookupSlot, 2);
4817 context()->Plug(v0); 4809 context()->Plug(v0);
4818 } 4810 }
4819 } else { 4811 } else {
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5553 reinterpret_cast<uint64_t>( 5545 reinterpret_cast<uint64_t>(
5554 isolate->builtins()->OsrAfterStackCheck()->entry())); 5546 isolate->builtins()->OsrAfterStackCheck()->entry()));
5555 return OSR_AFTER_STACK_CHECK; 5547 return OSR_AFTER_STACK_CHECK;
5556 } 5548 }
5557 5549
5558 5550
5559 } // namespace internal 5551 } // namespace internal
5560 } // namespace v8 5552 } // namespace v8
5561 5553
5562 #endif // V8_TARGET_ARCH_MIPS64 5554 #endif // V8_TARGET_ARCH_MIPS64
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