Comment cmnt(masm_, var->IsContextSlot()
? "Context variable"
: "Stack variable");
- if (var->binding_needs_init()) {
- // var->scope() may be NULL when the proxy is located in eval code and
- // refers to a potential outside binding. Currently those bindings are
- // always looked up dynamically, i.e. in that case
- // var->location() == LOOKUP.
- // always holds.
- ASSERT(var->scope() != NULL);
-
- // Check if the binding really needs an initialization check. The check
- // can be skipped in the following situation: we have a LET or CONST
- // binding in harmony mode, both the Variable and the VariableProxy have
- // the same declaration scope (i.e. they are both in global code, in the
- // same function or in the same eval code) and the VariableProxy is in
- // the source physically located after the initializer of the variable.
- //
- // We cannot skip any initialization checks for CONST in non-harmony
- // mode because const variables may be declared but never initialized:
- // if (false) { const x; }; var y = x;
- //
- // The condition on the declaration scopes is a conservative check for
- // nested functions that access a binding and are called before the
- // binding is initialized:
- // function() { f(); let x = 1; function f() { x = 2; } }
- //
- // Check that we always have valid source position.
- ASSERT(var->initializer_position() != RelocInfo::kNoPosition);
- ASSERT(proxy->position() != RelocInfo::kNoPosition);
- bool skip_init_check =
- var->mode() != CONST &&
- var->scope()->DeclarationScope() == scope()->DeclarationScope() &&
- var->initializer_position() < proxy->position();
- if (!skip_init_check) {
- // Let and const need a read barrier.
- GetVar(r0, var);
- __ CompareRoot(r0, Heap::kTheHoleValueRootIndex);
- if (var->mode() == LET || var->mode() == CONST_HARMONY) {
- // Throw a reference error when using an uninitialized let/const
- // binding in harmony mode.
- Label done;
- __ b(ne, &done);
- __ mov(r0, Operand(var->name()));
- __ push(r0);
- __ CallRuntime(Runtime::kThrowReferenceError, 1);
- __ bind(&done);
- } else {
- // Uninitalized const bindings outside of harmony mode are unholed.
- ASSERT(var->mode() == CONST);
- __ LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq);
- }
- context()->Plug(r0);
- break;
+ if (!var->binding_needs_init()) {
+ context()->Plug(var);
+ } else {
+ // Let and const need a read barrier.
+ GetVar(r0, var);
+ __ CompareRoot(r0, Heap::kTheHoleValueRootIndex);
+ if (var->mode() == LET || var->mode() == CONST_HARMONY) {
+ // Throw a reference error when using an uninitialized let/const
+ // binding in harmony mode.
+ Label done;
+ __ b(ne, &done);
+ __ mov(r0, Operand(var->name()));
+ __ push(r0);
+ __ CallRuntime(Runtime::kThrowReferenceError, 1);
+ __ bind(&done);
+ } else {
+ // Uninitalized const bindings outside of harmony mode are unholed.
+ ASSERT(var->mode() == CONST);
+ __ LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq);
}
+ context()->Plug(r0);
}
- context()->Plug(var);
break;
}
Comment cmnt(masm_, var->IsContextSlot()
? "Context variable"
: "Stack variable");
- if (var->binding_needs_init()) {
- // var->scope() may be NULL when the proxy is located in eval code and
- // refers to a potential outside binding. Currently those bindings are
- // always looked up dynamically, i.e. in that case
- // var->location() == LOOKUP.
- // always holds.
- ASSERT(var->scope() != NULL);
-
- // Check if the binding really needs an initialization check. The check
- // can be skipped in the following situation: we have a LET or CONST
- // binding in harmony mode, both the Variable and the VariableProxy have
- // the same declaration scope (i.e. they are both in global code, in the
- // same function or in the same eval code) and the VariableProxy is in
- // the source physically located after the initializer of the variable.
- //
- // We cannot skip any initialization checks for CONST in non-harmony
- // mode because const variables may be declared but never initialized:
- // if (false) { const x; }; var y = x;
- //
- // The condition on the declaration scopes is a conservative check for
- // nested functions that access a binding and are called before the
- // binding is initialized:
- // function() { f(); let x = 1; function f() { x = 2; } }
- //
- // Check that we always have valid source position.
- ASSERT(var->initializer_position() != RelocInfo::kNoPosition);
- ASSERT(proxy->position() != RelocInfo::kNoPosition);
- bool skip_init_check =
- var->mode() != CONST &&
- var->scope()->DeclarationScope() == scope()->DeclarationScope() &&
- var->initializer_position() < proxy->position();
- if (!skip_init_check) {
- // Let and const need a read barrier.
- Label done;
- GetVar(eax, var);
- __ cmp(eax, isolate()->factory()->the_hole_value());
- __ j(not_equal, &done, Label::kNear);
- if (var->mode() == LET || var->mode() == CONST_HARMONY) {
- // Throw a reference error when using an uninitialized let/const
- // binding in harmony mode.
- __ push(Immediate(var->name()));
- __ CallRuntime(Runtime::kThrowReferenceError, 1);
- } else {
- // Uninitalized const bindings outside of harmony mode are unholed.
- ASSERT(var->mode() == CONST);
- __ mov(eax, isolate()->factory()->undefined_value());
- }
- __ bind(&done);
- context()->Plug(eax);
- break;
+ if (!var->binding_needs_init()) {
+ context()->Plug(var);
+ } else {
+ // Let and const need a read barrier.
+ Label done;
+ GetVar(eax, var);
+ __ cmp(eax, isolate()->factory()->the_hole_value());
+ __ j(not_equal, &done, Label::kNear);
+ if (var->mode() == LET || var->mode() == CONST_HARMONY) {
+ // Throw a reference error when using an uninitialized let/const
+ // binding in harmony mode.
+ __ push(Immediate(var->name()));
+ __ CallRuntime(Runtime::kThrowReferenceError, 1);
+ } else {
+ // Uninitalized const bindings outside of harmony mode are unholed.
+ ASSERT(var->mode() == CONST);
+ __ mov(eax, isolate()->factory()->undefined_value());
}
+ __ bind(&done);
+ context()->Plug(eax);
}
- context()->Plug(var);
break;
}
// For let/const declarations in harmony mode, we can also immediately
// pre-resolve the proxy because it resides in the same scope as the
// declaration.
- VariableProxy* proxy = Declare(name, mode, NULL, mode != VAR, CHECK_OK);
+ Declare(name, mode, NULL, mode != VAR, CHECK_OK);
nvars++;
if (declaration_scope->num_var_or_const() > kMaxNumFunctionLocals) {
ReportMessageAt(scanner().location(), "too_many_variables",
if (decl_props != NULL) *decl_props = kHasInitializers;
}
- // Record the end position of the initializer.
- if (proxy->var() != NULL) {
- proxy->var()->set_initializer_position(scanner().location().end_pos);
- }
-
// Make sure that 'const x' and 'let x' initialize 'x' to undefined.
if (value == NULL && needs_init) {
value = GetLiteralUndefined();
kind_(kind),
location_(UNALLOCATED),
index_(-1),
- initializer_position_(RelocInfo::kNoPosition),
local_if_not_shadowed_(NULL),
is_valid_LHS_(is_valid_LHS),
force_context_allocation_(false),
bool is_used() { return is_used_; }
void set_is_used(bool flag) { is_used_ = flag; }
- int initializer_position() { return initializer_position_; }
- void set_initializer_position(int pos) { initializer_position_ = pos; }
-
bool IsVariable(Handle<String> n) const {
return !is_this() && name().is_identical_to(n);
}
Kind kind_;
Location location_;
int index_;
- int initializer_position_;
// If this field is set, this variable references the stored locally bound
// variable, but it might be shadowed by variable bindings introduced by
case Variable::LOCAL:
case Variable::CONTEXT: {
Comment cmnt(masm_, var->IsContextSlot() ? "Context slot" : "Stack slot");
- if (var->binding_needs_init()) {
- // var->scope() may be NULL when the proxy is located in eval code and
- // refers to a potential outside binding. Currently those bindings are
- // always looked up dynamically, i.e. in that case
- // var->location() == LOOKUP.
- // always holds.
- ASSERT(var->scope() != NULL);
-
- // Check if the binding really needs an initialization check. The check
- // can be skipped in the following situation: we have a LET or CONST
- // binding in harmony mode, both the Variable and the VariableProxy have
- // the same declaration scope (i.e. they are both in global code, in the
- // same function or in the same eval code) and the VariableProxy is in
- // the source physically located after the initializer of the variable.
- //
- // We cannot skip any initialization checks for CONST in non-harmony
- // mode because const variables may be declared but never initialized:
- // if (false) { const x; }; var y = x;
- //
- // The condition on the declaration scopes is a conservative check for
- // nested functions that access a binding and are called before the
- // binding is initialized:
- // function() { f(); let x = 1; function f() { x = 2; } }
- //
- // Check that we always have valid source position.
- ASSERT(var->initializer_position() != RelocInfo::kNoPosition);
- ASSERT(proxy->position() != RelocInfo::kNoPosition);
- bool skip_init_check =
- var->mode() != CONST &&
- var->scope()->DeclarationScope() == scope()->DeclarationScope() &&
- var->initializer_position() < proxy->position();
- if (!skip_init_check) {
- // Let and const need a read barrier.
- Label done;
- GetVar(rax, var);
- __ CompareRoot(rax, Heap::kTheHoleValueRootIndex);
- __ j(not_equal, &done, Label::kNear);
- if (var->mode() == LET || var->mode() == CONST_HARMONY) {
- // Throw a reference error when using an uninitialized let/const
- // binding in harmony mode.
- __ Push(var->name());
- __ CallRuntime(Runtime::kThrowReferenceError, 1);
- } else {
- // Uninitalized const bindings outside of harmony mode are unholed.
- ASSERT(var->mode() == CONST);
- __ LoadRoot(rax, Heap::kUndefinedValueRootIndex);
- }
- __ bind(&done);
- context()->Plug(rax);
- break;
+ if (!var->binding_needs_init()) {
+ context()->Plug(var);
+ } else {
+ // Let and const need a read barrier.
+ Label done;
+ GetVar(rax, var);
+ __ CompareRoot(rax, Heap::kTheHoleValueRootIndex);
+ __ j(not_equal, &done, Label::kNear);
+ if (var->mode() == LET || var->mode() == CONST_HARMONY) {
+ // Throw a reference error when using an uninitialized let/const
+ // binding in harmony mode.
+ __ Push(var->name());
+ __ CallRuntime(Runtime::kThrowReferenceError, 1);
+ } else {
+ // Uninitalized const bindings outside of harmony mode are unholed.
+ ASSERT(var->mode() == CONST);
+ __ LoadRoot(rax, Heap::kUndefinedValueRootIndex);
}
+ __ bind(&done);
+ context()->Plug(rax);
}
- context()->Plug(var);
break;
}
projects / platform / upstream / v8.git / commitdiff