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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
//===-- 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 between Decl and Type pointers and an index value.
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llvm::DenseMap<const Decl*, unsigned> DeclMap;
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llvm::DenseMap<const Type*, unsigned> TypeMap;
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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.
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void AddFunctionDecl(const FunctionDecl *Function);
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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
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