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Fix the semantics of delete on parameters.

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Before, an attempt to delete a parameter in a function that used the
arguments object in any way would succeed with true and delete both
the parameter and the corresponding arguments object property.

Now, an attempt to delete such a parameter does not delete and
evaluates to false.

Parameters can be deleted, as before, from functions that use the
arguments object, by deleting the corresponding arguments object
property (this is a spec violation).

BUG=fixes v8:1136

Review URL: http://codereview.chromium.org/6484023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6745 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
kmillikin@chromium.org 2011-02-11 11:57:11 +00:00
parent bea46a2723
commit 2e08148b06
4 changed files with 68 additions and 50 deletions
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14
src/arm/full-codegen-arm.cc
View File

@ -3053,26 +3053,30 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
// Result of deleting non-global, non-dynamic variables is false.
// The subexpression does not have side effects.
context()->Plug(false);
} else if (prop != NULL) {
if (prop->is_synthetic()) {
// Result of deleting parameters is false, even when they rewrite
// to accesses on the arguments object.
context()->Plug(false);
} else {
// Property or variable reference. Call the delete builtin with
// object and property name as arguments.
if (prop != NULL) {
VisitForStackValue(prop->obj());
VisitForStackValue(prop->key());
__ InvokeBuiltin(Builtins::DELETE, CALL_JS);
context()->Plug(r0);
}
} else if (var->is_global()) {
__ ldr(r1, GlobalObjectOperand());
__ mov(r0, Operand(var->name()));
__ Push(r1, r0);
__ InvokeBuiltin(Builtins::DELETE, CALL_JS);
context()->Plug(r0);
} else {
// Non-global variable. Call the runtime to delete from the
// Non-global variable. Call the runtime to try to delete from the
// context where the variable was introduced.
__ push(context_register());
__ mov(r2, Operand(var->name()));
__ push(r2);
__ CallRuntime(Runtime::kDeleteContextSlot, 2);
}
context()->Plug(r0);
}
break;

10
src/hydrogen.cc
View File

@ -4653,12 +4653,18 @@ void HGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
// The subexpression does not have side effects.
ast_context()->ReturnValue(graph()->GetConstantFalse());
} else if (prop != NULL) {
if (prop->is_synthetic()) {
// Result of deleting parameters is false, even when they rewrite
// to accesses on the arguments object.
ast_context()->ReturnValue(graph()->GetConstantFalse());
} else {
VISIT_FOR_VALUE(prop->obj());
VISIT_FOR_VALUE(prop->key());
HValue* key = Pop();
HValue* obj = Pop();
ast_context()->ReturnInstruction(new HDeleteProperty(obj, key),
expr->id());
HDeleteProperty* instr = new HDeleteProperty(obj, key);
ast_context()->ReturnInstruction(instr, expr->id());
}
} else if (var->is_global()) {
BAILOUT("delete with global variable");
} else {

14
src/ia32/full-codegen-ia32.cc
View File

@ -3721,24 +3721,28 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
// Result of deleting non-global, non-dynamic variables is false.
// The subexpression does not have side effects.
context()->Plug(false);
} else if (prop != NULL) {
if (prop->is_synthetic()) {
// Result of deleting parameters is false, even when they rewrite
// to accesses on the arguments object.
context()->Plug(false);
} else {
// Property or variable reference. Call the delete builtin with
// object and property name as arguments.
if (prop != NULL) {
VisitForStackValue(prop->obj());
VisitForStackValue(prop->key());
__ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
context()->Plug(eax);
}
} else if (var->is_global()) {
__ push(GlobalObjectOperand());
__ push(Immediate(var->name()));
__ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
context()->Plug(eax);
} else {
// Non-global variable. Call the runtime to delete from the
// Non-global variable. Call the runtime to try to delete from the
// context where the variable was introduced.
__ push(context_register());
__ push(Immediate(var->name()));
__ CallRuntime(Runtime::kDeleteContextSlot, 2);
}
context()->Plug(eax);
}
break;

14
src/x64/full-codegen-x64.cc
View File

@ -3060,24 +3060,28 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
// Result of deleting non-global, non-dynamic variables is false.
// The subexpression does not have side effects.
context()->Plug(false);
} else if (prop != NULL) {
if (prop->is_synthetic()) {
// Result of deleting parameters is false, even when they rewrite
// to accesses on the arguments object.
context()->Plug(false);
} else {
// Property or variable reference. Call the delete builtin with
// object and property name as arguments.
if (prop != NULL) {
VisitForStackValue(prop->obj());
VisitForStackValue(prop->key());
__ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
context()->Plug(rax);
}
} else if (var->is_global()) {
__ push(GlobalObjectOperand());
__ Push(var->name());
__ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
context()->Plug(rax);
} else {
// Non-global variable. Call the runtime to delete from the
// Non-global variable. Call the runtime to try to delete from the
// context where the variable was introduced.
__ push(context_register());
__ Push(var->name());
__ CallRuntime(Runtime::kDeleteContextSlot, 2);
}
context()->Plug(rax);
}
break;