Line data    Source code

       1             : // Copyright 2018 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             : #ifndef V8_AST_SOURCE_RANGE_AST_VISITOR_H_
       6             : #define V8_AST_SOURCE_RANGE_AST_VISITOR_H_
       7             : 
       8             : #include <unordered_set>
       9             : 
      10             : #include "src/ast/ast-traversal-visitor.h"
      11             : 
      12             : namespace v8 {
      13             : namespace internal {
      14             : 
      15             : class SourceRangeMap;
      16             : 
      17             : // Post-processes generated source ranges while the AST structure still exists.
      18             : //
      19             : // In particular, SourceRangeAstVisitor
      20             : //
      21             : // 1. deduplicates continuation source ranges, only keeping the outermost one.
      22             : // See also: https://crbug.com/v8/8539.
      23             : //
      24             : // 2. removes the source range associated with the final statement in a block
      25             : // or function body if the parent itself has a source range associated with it.
      26             : // See also: https://crbug.com/v8/8381.
      27         676 : class SourceRangeAstVisitor final
      28             :     : public AstTraversalVisitor<SourceRangeAstVisitor> {
      29             :  public:
      30             :   SourceRangeAstVisitor(uintptr_t stack_limit, Expression* root,
      31             :                         SourceRangeMap* source_range_map);
      32             : 
      33             :  private:
      34             :   friend class AstTraversalVisitor<SourceRangeAstVisitor>;
      35             : 
      36             :   void VisitBlock(Block* stmt);
      37             :   void VisitFunctionLiteral(FunctionLiteral* expr);
      38             :   bool VisitNode(AstNode* node);
      39             : 
      40             :   void MaybeRemoveLastContinuationRange(ZonePtrList<Statement>* stmts);
      41             : 
      42             :   SourceRangeMap* source_range_map_ = nullptr;
      43             :   std::unordered_set<int> continuation_positions_;
      44             : };
      45             : 
      46             : }  // namespace internal
      47             : }  // namespace v8
      48             : 
      49             : #endif  // V8_AST_SOURCE_RANGE_AST_VISITOR_H_