Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/parsing/parameter-initializer-rewriter.h" |
| 6 | |
| 7 | #include "src/ast/ast.h" |
| 8 | #include "src/ast/ast-expression-visitor.h" |
| 9 | #include "src/ast/scopes.h" |
| 10 | |
| 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | |
| 14 | namespace { |
| 15 | |
| 16 | |
| 17 | class Rewriter final : public AstExpressionVisitor { |
| 18 | public: |
| 19 | Rewriter(uintptr_t stack_limit, Expression* initializer, Scope* old_scope, |
| 20 | Scope* new_scope) |
| 21 | : AstExpressionVisitor(stack_limit, initializer), |
| 22 | old_scope_(old_scope), |
| 23 | new_scope_(new_scope) {} |
| 24 | |
| 25 | private: |
| 26 | void VisitExpression(Expression* expr) override {} |
| 27 | |
| 28 | void VisitFunctionLiteral(FunctionLiteral* expr) override; |
| 29 | void VisitClassLiteral(ClassLiteral* expr) override; |
| 30 | void VisitVariableProxy(VariableProxy* expr) override; |
| 31 | |
| 32 | Scope* old_scope_; |
| 33 | Scope* new_scope_; |
| 34 | }; |
| 35 | |
| 36 | |
| 37 | void Rewriter::VisitFunctionLiteral(FunctionLiteral* function_literal) { |
| 38 | function_literal->scope()->ReplaceOuterScope(new_scope_); |
| 39 | } |
| 40 | |
| 41 | |
| 42 | void Rewriter::VisitClassLiteral(ClassLiteral* class_literal) { |
| 43 | class_literal->scope()->ReplaceOuterScope(new_scope_); |
| 44 | if (class_literal->extends() != nullptr) { |
| 45 | Visit(class_literal->extends()); |
| 46 | } |
| 47 | // No need to visit the constructor since it will have the class |
| 48 | // scope on its scope chain. |
| 49 | ZoneList<ObjectLiteralProperty*>* props = class_literal->properties(); |
| 50 | for (int i = 0; i < props->length(); ++i) { |
| 51 | ObjectLiteralProperty* prop = props->at(i); |
| 52 | if (!prop->key()->IsLiteral()) { |
| 53 | Visit(prop->key()); |
| 54 | } |
| 55 | // No need to visit the values, since all values are functions with |
| 56 | // the class scope on their scope chain. |
| 57 | DCHECK(prop->value()->IsFunctionLiteral()); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | |
| 62 | void Rewriter::VisitVariableProxy(VariableProxy* proxy) { |
| 63 | if (proxy->is_resolved()) { |
| 64 | Variable* var = proxy->var(); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 65 | if (var->mode() != TEMPORARY) return; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 66 | if (old_scope_->RemoveTemporary(var)) { |
| 67 | var->set_scope(new_scope_); |
| 68 | new_scope_->AddTemporary(var); |
| 69 | } |
| 70 | } else if (old_scope_->RemoveUnresolved(proxy)) { |
| 71 | new_scope_->AddUnresolved(proxy); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | |
| 76 | } // anonymous namespace |
| 77 | |
| 78 | |
| 79 | void RewriteParameterInitializerScope(uintptr_t stack_limit, |
| 80 | Expression* initializer, Scope* old_scope, |
| 81 | Scope* new_scope) { |
| 82 | Rewriter rewriter(stack_limit, initializer, old_scope, new_scope); |
| 83 | rewriter.Run(); |
| 84 | } |
| 85 | |
| 86 | |
| 87 | } // namespace internal |
| 88 | } // namespace v8 |