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+//===-- ODRHash.h - Hashing to diagnose ODR failures ------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file contains the declaration of the ODRHash class, which calculates
+/// a hash based on AST nodes, which is stable across different runs.
+///
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/DeclarationName.h"
+#include "clang/AST/Type.h"
+#include "clang/AST/TemplateBase.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/PointerUnion.h"
+#include "llvm/ADT/SmallVector.h"
+
+namespace clang {
+
+class Decl;
+class IdentifierInfo;
+class NestedNameSpecifer;
+class Stmt;
+class TemplateParameterList;
+
+// ODRHash is used to calculate a hash based on AST node contents that
+// does not rely on pointer addresses. This allows the hash to not vary
+// between runs and is usable to detect ODR problems in modules. To use,
+// construct an ODRHash object, then call Add* methods over the nodes that
+// need to be hashed. Then call CalculateHash to get the hash value.
+// Typically, only one Add* call is needed. clear can be called to reuse the
+// object.
+class ODRHash {
+ // Use DenseMaps to convert between Decl and Type pointers and an index value.
+ llvm::DenseMap<const Decl*, unsigned> DeclMap;
+ llvm::DenseMap<const Type*, unsigned> TypeMap;
+
+ // Save space by processing bools at the end.
+ llvm::SmallVector<bool, 128> Bools;
+
+ llvm::FoldingSetNodeID ID;
+
+public:
+ ODRHash() {}
+
+ // Use this for ODR checking classes between modules. This method compares
+ // more information than the AddDecl class.
+ void AddCXXRecordDecl(const CXXRecordDecl *Record);
+
+ // Process SubDecls of the main Decl. This method calls the DeclVisitor
+ // while AddDecl does not.
+ void AddSubDecl(const Decl *D);
+
+ // Reset the object for reuse.
+ void clear();
+
+ // Add booleans to ID and uses it to calculate the hash.
+ unsigned CalculateHash();
+
+ // Add AST nodes that need to be processed.
+ void AddDecl(const Decl *D);
+ void AddType(const Type *T);
+ void AddQualType(QualType T);
+ void AddStmt(const Stmt *S);
+ void AddIdentifierInfo(const IdentifierInfo *II);
+ void AddNestedNameSpecifier(const NestedNameSpecifier *NNS);
+ void AddTemplateName(TemplateName Name);
+ void AddDeclarationName(DeclarationName Name);
+ void AddTemplateArgument(TemplateArgument TA);
+ void AddTemplateParameterList(const TemplateParameterList *TPL);
+
+ // Save booleans until the end to lower the size of data to process.
+ void AddBoolean(bool value);
+
+ static bool isWhitelistedDecl(const Decl* D, const CXXRecordDecl *Record);
+};
+
+} // end namespace clang
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