6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
//===-- ODRHash.h - Hashing to diagnose ODR failures ------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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#ifndef LLVM_CLANG_AST_ODRHASH_H
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#define LLVM_CLANG_AST_ODRHASH_H
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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 APValue;
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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 records in C/Objective-C between modules. This
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// method compares more information than the AddDecl class.
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void AddRecordDecl(const RecordDecl *Record);
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// Use this for ODR checking ObjC interfaces. This
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// method compares more information than the AddDecl class.
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void AddObjCInterfaceDecl(const ObjCInterfaceDecl *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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// Use this for ODR checking enums between modules. This method compares
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// more information than the AddDecl class.
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void AddEnumDecl(const EnumDecl *Enum);
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// Use this for ODR checking ObjC protocols. This
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// method compares more information than the AddDecl class.
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void AddObjCProtocolDecl(const ObjCProtocolDecl *P);
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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, bool TreatAsDecl = false);
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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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void AddStructuralValue(const APValue &);
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static bool isSubDeclToBeProcessed(const Decl *D, const DeclContext *Parent);
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private:
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void AddDeclarationNameImpl(DeclarationName Name);
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};
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} // end namespace clang
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#endif
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