1 //===-- ODRHash.h - Hashing to diagnose ODR failures ------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// This file contains the declaration of the ODRHash class, which calculates
12 /// a hash based on AST nodes, which is stable across different runs.
14 //===----------------------------------------------------------------------===//
16 #include "clang/AST/DeclarationName.h"
17 #include "clang/AST/Type.h"
18 #include "clang/AST/TemplateBase.h"
19 #include "llvm/ADT/DenseMap.h"
20 #include "llvm/ADT/FoldingSet.h"
21 #include "llvm/ADT/PointerUnion.h"
22 #include "llvm/ADT/SmallVector.h"
28 class NestedNameSpecifier;
30 class TemplateParameterList;
32 // ODRHash is used to calculate a hash based on AST node contents that
33 // does not rely on pointer addresses. This allows the hash to not vary
34 // between runs and is usable to detect ODR problems in modules. To use,
35 // construct an ODRHash object, then call Add* methods over the nodes that
36 // need to be hashed. Then call CalculateHash to get the hash value.
37 // Typically, only one Add* call is needed. clear can be called to reuse the
40 // Use DenseMaps to convert from DeclarationName and Type pointers
42 llvm::DenseMap<DeclarationName, unsigned> DeclNameMap;
44 // Save space by processing bools at the end.
45 llvm::SmallVector<bool, 128> Bools;
47 llvm::FoldingSetNodeID ID;
52 // Use this for ODR checking classes between modules. This method compares
53 // more information than the AddDecl class.
54 void AddCXXRecordDecl(const CXXRecordDecl *Record);
56 // Use this for ODR checking functions between modules. This method compares
57 // more information than the AddDecl class. SkipBody will process the
58 // hash as if the function has no body.
59 void AddFunctionDecl(const FunctionDecl *Function, bool SkipBody = false);
61 // Use this for ODR checking enums between modules. This method compares
62 // more information than the AddDecl class.
63 void AddEnumDecl(const EnumDecl *Enum);
65 // Process SubDecls of the main Decl. This method calls the DeclVisitor
66 // while AddDecl does not.
67 void AddSubDecl(const Decl *D);
69 // Reset the object for reuse.
72 // Add booleans to ID and uses it to calculate the hash.
73 unsigned CalculateHash();
75 // Add AST nodes that need to be processed.
76 void AddDecl(const Decl *D);
77 void AddType(const Type *T);
78 void AddQualType(QualType T);
79 void AddStmt(const Stmt *S);
80 void AddIdentifierInfo(const IdentifierInfo *II);
81 void AddNestedNameSpecifier(const NestedNameSpecifier *NNS);
82 void AddTemplateName(TemplateName Name);
83 void AddDeclarationName(DeclarationName Name);
84 void AddTemplateArgument(TemplateArgument TA);
85 void AddTemplateParameterList(const TemplateParameterList *TPL);
87 // Save booleans until the end to lower the size of data to process.
88 void AddBoolean(bool value);
90 static bool isWhitelistedDecl(const Decl* D, const DeclContext *Parent);
93 } // end namespace clang