Coverage Report

Created: 2018-07-21 08:31

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/tools/clang/include/clang/AST/ODRHash.h
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//===-- ODRHash.h - Hashing to diagnose ODR failures ------------*- C++ -*-===//
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//
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//                     The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file contains the declaration of the ODRHash class, which calculates
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/// a hash based on AST nodes, which is stable across different runs.
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///
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//===----------------------------------------------------------------------===//
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#include "clang/AST/DeclarationName.h"
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#include "clang/AST/Type.h"
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#include "clang/AST/TemplateBase.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "llvm/ADT/SmallVector.h"
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namespace clang {
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class Decl;
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class IdentifierInfo;
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class NestedNameSpecifier;
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class Stmt;
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class TemplateParameterList;
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// ODRHash is used to calculate a hash based on AST node contents that
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// does not rely on pointer addresses.  This allows the hash to not vary
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// between runs and is usable to detect ODR problems in modules.  To use,
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// construct an ODRHash object, then call Add* methods over the nodes that
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// need to be hashed.  Then call CalculateHash to get the hash value.
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// Typically, only one Add* call is needed.  clear can be called to reuse the
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// object.
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class ODRHash {
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  // Use DenseMaps to convert from DeclarationName and Type pointers
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  // to an index value.
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  llvm::DenseMap<DeclarationName, unsigned> DeclNameMap;
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  // Save space by processing bools at the end.
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  llvm::SmallVector<bool, 128> Bools;
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  llvm::FoldingSetNodeID ID;
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public:
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  ODRHash() {}
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  // Use this for ODR checking classes between modules.  This method compares
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  // more information than the AddDecl class.
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  void AddCXXRecordDecl(const CXXRecordDecl *Record);
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  // Use this for ODR checking functions between modules.  This method compares
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  // more information than the AddDecl class.  SkipBody will process the
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  // hash as if the function has no body.
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  void AddFunctionDecl(const FunctionDecl *Function, bool SkipBody = false);
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  // Process SubDecls of the main Decl.  This method calls the DeclVisitor
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  // while AddDecl does not.
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  void AddSubDecl(const Decl *D);
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  // Reset the object for reuse.
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  void clear();
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  // Add booleans to ID and uses it to calculate the hash.
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  unsigned CalculateHash();
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  // Add AST nodes that need to be processed.
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  void AddDecl(const Decl *D);
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  void AddType(const Type *T);
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  void AddQualType(QualType T);
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  void AddStmt(const Stmt *S);
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  void AddIdentifierInfo(const IdentifierInfo *II);
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  void AddNestedNameSpecifier(const NestedNameSpecifier *NNS);
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  void AddTemplateName(TemplateName Name);
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  void AddDeclarationName(DeclarationName Name);
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  void AddTemplateArgument(TemplateArgument TA);
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  void AddTemplateParameterList(const TemplateParameterList *TPL);
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  // Save booleans until the end to lower the size of data to process.
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  void AddBoolean(bool value);
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  static bool isWhitelistedDecl(const Decl* D, const CXXRecordDecl *Record);
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};
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}  // end namespace clang