| // 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/parameter-initializer-rewriter.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 Rewriter final : public AstTraversalVisitor<Rewriter> { |
| public: |
| Rewriter(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<Rewriter>; |
| |
| void VisitFunctionLiteral(FunctionLiteral* expr); |
| void VisitClassLiteral(ClassLiteral* expr); |
| void VisitVariableProxy(VariableProxy* expr); |
| |
| void VisitBlock(Block* stmt); |
| void VisitTryCatchStatement(TryCatchStatement* stmt); |
| void VisitWithStatement(WithStatement* stmt); |
| |
| Scope* scope_; |
| }; |
| |
| void Rewriter::VisitFunctionLiteral(FunctionLiteral* function_literal) { |
| function_literal->scope()->ReplaceOuterScope(scope_); |
| } |
| |
| |
| void Rewriter::VisitClassLiteral(ClassLiteral* class_literal) { |
| if (class_literal->extends() != nullptr) { |
| Visit(class_literal->extends()); |
| } |
| // No need to visit the constructor since it will have the class |
| // scope on its scope chain. |
| ZoneList<ClassLiteralProperty*>* props = class_literal->properties(); |
| for (int i = 0; i < props->length(); ++i) { |
| ClassLiteralProperty* prop = props->at(i); |
| if (!prop->key()->IsLiteral()) { |
| Visit(prop->key()); |
| } |
| // No need to visit the values, since all values are functions with |
| // the class scope on their scope chain. |
| DCHECK(prop->value()->IsFunctionLiteral()); |
| } |
| } |
| |
| |
| void Rewriter::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() != TEMPORARY || |
| proxy->var()->scope() == scope_->GetClosureScope()); |
| } |
| } |
| |
| |
| void Rewriter::VisitBlock(Block* stmt) { |
| if (stmt->scope() != nullptr) |
| stmt->scope()->ReplaceOuterScope(scope_); |
| else |
| VisitStatements(stmt->statements()); |
| } |
| |
| |
| void Rewriter::VisitTryCatchStatement(TryCatchStatement* stmt) { |
| Visit(stmt->try_block()); |
| stmt->scope()->ReplaceOuterScope(scope_); |
| } |
| |
| |
| void Rewriter::VisitWithStatement(WithStatement* stmt) { |
| Visit(stmt->expression()); |
| stmt->scope()->ReplaceOuterScope(scope_); |
| } |
| |
| |
| } // anonymous namespace |
| |
| void ReparentExpressionScope(uintptr_t stack_limit, Expression* expr, |
| Scope* scope) { |
| // Both uses of this function should pass in a block scope. |
| DCHECK(scope->is_block_scope()); |
| // These hold for the sloppy parameters-with-eval case... |
| DCHECK_IMPLIES(scope->is_declaration_scope(), scope->calls_sloppy_eval()); |
| DCHECK_IMPLIES(scope->is_declaration_scope(), |
| scope->outer_scope()->is_function_scope()); |
| // ...whereas these hold for lexical declarations in for-in/of loops. |
| DCHECK_IMPLIES(!scope->is_declaration_scope(), |
| scope->outer_scope()->is_block_scope()); |
| DCHECK_IMPLIES(!scope->is_declaration_scope(), |
| scope->outer_scope()->is_hidden()); |
| |
| Rewriter rewriter(stack_limit, expr, scope); |
| rewriter.Run(); |
| } |
| |
| |
| } // namespace internal |
| } // namespace v8 |