blob: 30e96d16881bac384d67a951c78b5bbd7b4804a8 [file] [log] [blame]
// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/parsing/expression-scope-reparenter.h"
#include "src/ast/ast-traversal-visitor.h"
#include "src/ast/ast.h"
#include "src/ast/scopes.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
namespace {
class Reparenter final : public AstTraversalVisitor<Reparenter> {
public:
Reparenter(uintptr_t stack_limit, Expression* initializer, Scope* scope)
: AstTraversalVisitor(stack_limit, initializer), scope_(scope) {}
private:
// This is required so that the overriden Visit* methods can be
// called by the base class (template).
friend class AstTraversalVisitor<Reparenter>;
void VisitFunctionLiteral(FunctionLiteral* expr);
void VisitClassLiteral(ClassLiteral* expr);
void VisitVariableProxy(VariableProxy* expr);
void VisitRewritableExpression(RewritableExpression* expr);
void VisitBlock(Block* stmt);
void VisitTryCatchStatement(TryCatchStatement* stmt);
void VisitWithStatement(WithStatement* stmt);
Scope* scope_;
};
void Reparenter::VisitFunctionLiteral(FunctionLiteral* function_literal) {
function_literal->scope()->ReplaceOuterScope(scope_);
}
void Reparenter::VisitClassLiteral(ClassLiteral* class_literal) {
class_literal->scope()->ReplaceOuterScope(scope_);
// No need to visit the constructor since it will have the class
// scope on its scope chain.
DCHECK_EQ(class_literal->constructor()->scope()->outer_scope(),
class_literal->scope());
if (class_literal->static_fields_initializer() != nullptr) {
DCHECK_EQ(
class_literal->static_fields_initializer()->scope()->outer_scope(),
class_literal->scope());
}
#if DEBUG
// The same goes for the rest of the class, but we do some
// sanity checking in debug mode.
ZonePtrList<ClassLiteralProperty>* props = class_literal->properties();
for (int i = 0; i < props->length(); ++i) {
ClassLiteralProperty* prop = props->at(i);
// No need to visit the values, since all values are functions with
// the class scope on their scope chain.
DCHECK(prop->value()->IsFunctionLiteral());
DCHECK_EQ(prop->value()->AsFunctionLiteral()->scope()->outer_scope(),
class_literal->scope());
}
#endif
}
void Reparenter::VisitVariableProxy(VariableProxy* proxy) {
if (!proxy->is_resolved()) {
if (scope_->outer_scope()->RemoveUnresolved(proxy)) {
scope_->AddUnresolved(proxy);
}
} else {
// Ensure that temporaries we find are already in the correct scope.
DCHECK(proxy->var()->mode() != VariableMode::kTemporary ||
proxy->var()->scope() == scope_->GetClosureScope());
}
}
void Reparenter::VisitRewritableExpression(RewritableExpression* expr) {
Visit(expr->expression());
expr->set_scope(scope_);
}
void Reparenter::VisitBlock(Block* stmt) {
if (stmt->scope())
stmt->scope()->ReplaceOuterScope(scope_);
else
VisitStatements(stmt->statements());
}
void Reparenter::VisitTryCatchStatement(TryCatchStatement* stmt) {
Visit(stmt->try_block());
if (stmt->scope()) {
stmt->scope()->ReplaceOuterScope(scope_);
} else {
Visit(stmt->catch_block());
}
}
void Reparenter::VisitWithStatement(WithStatement* stmt) {
Visit(stmt->expression());
stmt->scope()->ReplaceOuterScope(scope_);
}
} // anonymous namespace
void ReparentExpressionScope(uintptr_t stack_limit, Expression* expr,
Scope* scope) {
// The only case that uses this code is block scopes for parameters containing
// sloppy eval.
DCHECK(scope->is_block_scope());
DCHECK(scope->is_declaration_scope());
DCHECK(scope->AsDeclarationScope()->calls_sloppy_eval());
DCHECK(scope->outer_scope()->is_function_scope());
Reparenter r(stack_limit, expr, scope);
r.Run();
}
} // namespace internal
} // namespace v8