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9747a7c562
FunctionDecl already hashes most of the information in the function's type. Add hashing of the return type, and skip hashing the function's type to avoid redundancy and extra work when computing the hash. llvm-svn: 307986
631 lines
16 KiB
C++
631 lines
16 KiB
C++
//===-- ODRHash.cpp - 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 implements the ODRHash class, which calculates a hash based
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/// on AST nodes, which is stable across different runs.
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///
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//===----------------------------------------------------------------------===//
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#include "clang/AST/ODRHash.h"
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#include "clang/AST/DeclVisitor.h"
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#include "clang/AST/NestedNameSpecifier.h"
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#include "clang/AST/StmtVisitor.h"
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#include "clang/AST/TypeVisitor.h"
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using namespace clang;
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void ODRHash::AddStmt(const Stmt *S) {
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assert(S && "Expecting non-null pointer.");
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S->ProcessODRHash(ID, *this);
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}
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void ODRHash::AddIdentifierInfo(const IdentifierInfo *II) {
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assert(II && "Expecting non-null pointer.");
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ID.AddString(II->getName());
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}
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void ODRHash::AddDeclarationName(DeclarationName Name) {
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AddBoolean(Name.isEmpty());
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if (Name.isEmpty())
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return;
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auto Kind = Name.getNameKind();
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ID.AddInteger(Kind);
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switch (Kind) {
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case DeclarationName::Identifier:
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AddIdentifierInfo(Name.getAsIdentifierInfo());
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break;
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case DeclarationName::ObjCZeroArgSelector:
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case DeclarationName::ObjCOneArgSelector:
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case DeclarationName::ObjCMultiArgSelector: {
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Selector S = Name.getObjCSelector();
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AddBoolean(S.isNull());
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AddBoolean(S.isKeywordSelector());
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AddBoolean(S.isUnarySelector());
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unsigned NumArgs = S.getNumArgs();
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for (unsigned i = 0; i < NumArgs; ++i) {
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AddIdentifierInfo(S.getIdentifierInfoForSlot(i));
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}
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break;
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}
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case DeclarationName::CXXConstructorName:
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case DeclarationName::CXXDestructorName:
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AddQualType(Name.getCXXNameType());
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break;
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case DeclarationName::CXXOperatorName:
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ID.AddInteger(Name.getCXXOverloadedOperator());
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break;
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case DeclarationName::CXXLiteralOperatorName:
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AddIdentifierInfo(Name.getCXXLiteralIdentifier());
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break;
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case DeclarationName::CXXConversionFunctionName:
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AddQualType(Name.getCXXNameType());
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break;
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case DeclarationName::CXXUsingDirective:
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break;
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case DeclarationName::CXXDeductionGuideName: {
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auto *Template = Name.getCXXDeductionGuideTemplate();
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AddBoolean(Template);
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if (Template) {
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AddDecl(Template);
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}
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}
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}
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}
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void ODRHash::AddNestedNameSpecifier(const NestedNameSpecifier *NNS) {
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assert(NNS && "Expecting non-null pointer.");
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const auto *Prefix = NNS->getPrefix();
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AddBoolean(Prefix);
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if (Prefix) {
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AddNestedNameSpecifier(Prefix);
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}
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auto Kind = NNS->getKind();
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ID.AddInteger(Kind);
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switch (Kind) {
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case NestedNameSpecifier::Identifier:
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AddIdentifierInfo(NNS->getAsIdentifier());
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break;
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case NestedNameSpecifier::Namespace:
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AddDecl(NNS->getAsNamespace());
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break;
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case NestedNameSpecifier::NamespaceAlias:
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AddDecl(NNS->getAsNamespaceAlias());
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break;
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case NestedNameSpecifier::TypeSpec:
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case NestedNameSpecifier::TypeSpecWithTemplate:
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AddType(NNS->getAsType());
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break;
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case NestedNameSpecifier::Global:
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case NestedNameSpecifier::Super:
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break;
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}
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}
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void ODRHash::AddTemplateName(TemplateName Name) {
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auto Kind = Name.getKind();
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ID.AddInteger(Kind);
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switch (Kind) {
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case TemplateName::Template:
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AddDecl(Name.getAsTemplateDecl());
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break;
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// TODO: Support these cases.
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case TemplateName::OverloadedTemplate:
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case TemplateName::QualifiedTemplate:
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case TemplateName::DependentTemplate:
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case TemplateName::SubstTemplateTemplateParm:
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case TemplateName::SubstTemplateTemplateParmPack:
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break;
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}
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}
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void ODRHash::AddTemplateArgument(TemplateArgument TA) {
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const auto Kind = TA.getKind();
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ID.AddInteger(Kind);
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switch (Kind) {
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case TemplateArgument::Null:
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llvm_unreachable("Expected valid TemplateArgument");
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case TemplateArgument::Type:
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AddQualType(TA.getAsType());
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break;
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case TemplateArgument::Declaration:
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case TemplateArgument::NullPtr:
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case TemplateArgument::Integral:
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break;
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case TemplateArgument::Template:
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case TemplateArgument::TemplateExpansion:
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AddTemplateName(TA.getAsTemplateOrTemplatePattern());
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break;
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case TemplateArgument::Expression:
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AddStmt(TA.getAsExpr());
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break;
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case TemplateArgument::Pack:
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ID.AddInteger(TA.pack_size());
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for (auto SubTA : TA.pack_elements()) {
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AddTemplateArgument(SubTA);
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}
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break;
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}
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}
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void ODRHash::AddTemplateParameterList(const TemplateParameterList *TPL) {}
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void ODRHash::clear() {
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DeclMap.clear();
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TypeMap.clear();
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Bools.clear();
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ID.clear();
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}
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unsigned ODRHash::CalculateHash() {
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// Append the bools to the end of the data segment backwards. This allows
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// for the bools data to be compressed 32 times smaller compared to using
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// ID.AddBoolean
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const unsigned unsigned_bits = sizeof(unsigned) * CHAR_BIT;
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const unsigned size = Bools.size();
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const unsigned remainder = size % unsigned_bits;
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const unsigned loops = size / unsigned_bits;
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auto I = Bools.rbegin();
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unsigned value = 0;
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for (unsigned i = 0; i < remainder; ++i) {
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value <<= 1;
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value |= *I;
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++I;
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}
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ID.AddInteger(value);
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for (unsigned i = 0; i < loops; ++i) {
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value = 0;
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for (unsigned j = 0; j < unsigned_bits; ++j) {
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value <<= 1;
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value |= *I;
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++I;
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}
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ID.AddInteger(value);
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}
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assert(I == Bools.rend());
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Bools.clear();
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return ID.ComputeHash();
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}
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// Process a Decl pointer. Add* methods call back into ODRHash while Visit*
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// methods process the relevant parts of the Decl.
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class ODRDeclVisitor : public ConstDeclVisitor<ODRDeclVisitor> {
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typedef ConstDeclVisitor<ODRDeclVisitor> Inherited;
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llvm::FoldingSetNodeID &ID;
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ODRHash &Hash;
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public:
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ODRDeclVisitor(llvm::FoldingSetNodeID &ID, ODRHash &Hash)
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: ID(ID), Hash(Hash) {}
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void AddStmt(const Stmt *S) {
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Hash.AddBoolean(S);
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if (S) {
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Hash.AddStmt(S);
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}
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}
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void AddIdentifierInfo(const IdentifierInfo *II) {
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Hash.AddBoolean(II);
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if (II) {
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Hash.AddIdentifierInfo(II);
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}
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}
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void AddQualType(QualType T) {
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Hash.AddQualType(T);
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}
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void AddDecl(const Decl *D) {
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Hash.AddBoolean(D);
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if (D) {
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Hash.AddDecl(D);
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}
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}
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void Visit(const Decl *D) {
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ID.AddInteger(D->getKind());
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Inherited::Visit(D);
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}
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void VisitNamedDecl(const NamedDecl *D) {
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Hash.AddDeclarationName(D->getDeclName());
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Inherited::VisitNamedDecl(D);
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}
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void VisitValueDecl(const ValueDecl *D) {
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if (!isa<FunctionDecl>(D)) {
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AddQualType(D->getType());
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}
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Inherited::VisitValueDecl(D);
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}
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void VisitVarDecl(const VarDecl *D) {
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Hash.AddBoolean(D->isStaticLocal());
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Hash.AddBoolean(D->isConstexpr());
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const bool HasInit = D->hasInit();
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Hash.AddBoolean(HasInit);
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if (HasInit) {
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AddStmt(D->getInit());
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}
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Inherited::VisitVarDecl(D);
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}
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void VisitParmVarDecl(const ParmVarDecl *D) {
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// TODO: Handle default arguments.
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Inherited::VisitParmVarDecl(D);
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}
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void VisitAccessSpecDecl(const AccessSpecDecl *D) {
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ID.AddInteger(D->getAccess());
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Inherited::VisitAccessSpecDecl(D);
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}
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void VisitStaticAssertDecl(const StaticAssertDecl *D) {
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AddStmt(D->getAssertExpr());
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AddStmt(D->getMessage());
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Inherited::VisitStaticAssertDecl(D);
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}
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void VisitFieldDecl(const FieldDecl *D) {
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const bool IsBitfield = D->isBitField();
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Hash.AddBoolean(IsBitfield);
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if (IsBitfield) {
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AddStmt(D->getBitWidth());
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}
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Hash.AddBoolean(D->isMutable());
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AddStmt(D->getInClassInitializer());
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Inherited::VisitFieldDecl(D);
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}
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void VisitFunctionDecl(const FunctionDecl *D) {
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ID.AddInteger(D->getStorageClass());
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Hash.AddBoolean(D->isInlineSpecified());
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Hash.AddBoolean(D->isVirtualAsWritten());
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Hash.AddBoolean(D->isPure());
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Hash.AddBoolean(D->isDeletedAsWritten());
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ID.AddInteger(D->param_size());
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for (auto *Param : D->parameters()) {
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Hash.AddSubDecl(Param);
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}
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AddQualType(D->getReturnType());
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Inherited::VisitFunctionDecl(D);
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}
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void VisitCXXMethodDecl(const CXXMethodDecl *D) {
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Hash.AddBoolean(D->isConst());
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Hash.AddBoolean(D->isVolatile());
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Inherited::VisitCXXMethodDecl(D);
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}
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void VisitTypedefNameDecl(const TypedefNameDecl *D) {
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AddQualType(D->getUnderlyingType());
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Inherited::VisitTypedefNameDecl(D);
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}
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void VisitTypedefDecl(const TypedefDecl *D) {
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Inherited::VisitTypedefDecl(D);
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}
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void VisitTypeAliasDecl(const TypeAliasDecl *D) {
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Inherited::VisitTypeAliasDecl(D);
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}
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void VisitFriendDecl(const FriendDecl *D) {
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TypeSourceInfo *TSI = D->getFriendType();
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Hash.AddBoolean(TSI);
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if (TSI) {
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AddQualType(TSI->getType());
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} else {
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AddDecl(D->getFriendDecl());
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}
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}
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};
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// Only allow a small portion of Decl's to be processed. Remove this once
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// all Decl's can be handled.
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bool ODRHash::isWhitelistedDecl(const Decl *D, const CXXRecordDecl *Parent) {
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if (D->isImplicit()) return false;
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if (D->getDeclContext() != Parent) return false;
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switch (D->getKind()) {
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default:
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return false;
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case Decl::AccessSpec:
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case Decl::CXXMethod:
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case Decl::Field:
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case Decl::Friend:
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case Decl::StaticAssert:
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case Decl::TypeAlias:
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case Decl::Typedef:
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case Decl::Var:
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return true;
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}
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}
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void ODRHash::AddSubDecl(const Decl *D) {
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assert(D && "Expecting non-null pointer.");
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AddDecl(D);
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ODRDeclVisitor(ID, *this).Visit(D);
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}
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void ODRHash::AddCXXRecordDecl(const CXXRecordDecl *Record) {
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assert(Record && Record->hasDefinition() &&
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"Expected non-null record to be a definition.");
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if (isa<ClassTemplateSpecializationDecl>(Record)) {
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return;
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}
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AddDecl(Record);
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// Filter out sub-Decls which will not be processed in order to get an
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// accurate count of Decl's.
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llvm::SmallVector<const Decl *, 16> Decls;
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for (const Decl *SubDecl : Record->decls()) {
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if (isWhitelistedDecl(SubDecl, Record)) {
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Decls.push_back(SubDecl);
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}
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}
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ID.AddInteger(Decls.size());
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for (auto SubDecl : Decls) {
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AddSubDecl(SubDecl);
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}
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}
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void ODRHash::AddDecl(const Decl *D) {
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assert(D && "Expecting non-null pointer.");
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auto Result = DeclMap.insert(std::make_pair(D, DeclMap.size()));
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ID.AddInteger(Result.first->second);
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// On first encounter of a Decl pointer, process it. Every time afterwards,
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// only the index value is needed.
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if (!Result.second) {
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return;
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}
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ID.AddInteger(D->getKind());
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if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) {
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AddDeclarationName(ND->getDeclName());
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}
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}
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// Process a Type pointer. Add* methods call back into ODRHash while Visit*
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// methods process the relevant parts of the Type.
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class ODRTypeVisitor : public TypeVisitor<ODRTypeVisitor> {
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typedef TypeVisitor<ODRTypeVisitor> Inherited;
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llvm::FoldingSetNodeID &ID;
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ODRHash &Hash;
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public:
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ODRTypeVisitor(llvm::FoldingSetNodeID &ID, ODRHash &Hash)
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: ID(ID), Hash(Hash) {}
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void AddStmt(Stmt *S) {
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Hash.AddBoolean(S);
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if (S) {
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Hash.AddStmt(S);
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}
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}
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void AddDecl(Decl *D) {
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Hash.AddBoolean(D);
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if (D) {
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Hash.AddDecl(D);
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}
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}
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void AddQualType(QualType T) {
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Hash.AddQualType(T);
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}
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void AddType(const Type *T) {
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Hash.AddBoolean(T);
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if (T) {
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Hash.AddType(T);
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}
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}
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void AddNestedNameSpecifier(const NestedNameSpecifier *NNS) {
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Hash.AddBoolean(NNS);
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if (NNS) {
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Hash.AddNestedNameSpecifier(NNS);
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}
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}
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void AddIdentifierInfo(const IdentifierInfo *II) {
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Hash.AddBoolean(II);
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if (II) {
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Hash.AddIdentifierInfo(II);
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}
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}
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void VisitQualifiers(Qualifiers Quals) {
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ID.AddInteger(Quals.getAsOpaqueValue());
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}
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void Visit(const Type *T) {
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ID.AddInteger(T->getTypeClass());
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Inherited::Visit(T);
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}
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void VisitType(const Type *T) {}
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void VisitAdjustedType(const AdjustedType *T) {
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AddQualType(T->getOriginalType());
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AddQualType(T->getAdjustedType());
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VisitType(T);
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}
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void VisitDecayedType(const DecayedType *T) {
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AddQualType(T->getDecayedType());
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AddQualType(T->getPointeeType());
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VisitAdjustedType(T);
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}
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void VisitArrayType(const ArrayType *T) {
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AddQualType(T->getElementType());
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ID.AddInteger(T->getSizeModifier());
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VisitQualifiers(T->getIndexTypeQualifiers());
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VisitType(T);
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}
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void VisitConstantArrayType(const ConstantArrayType *T) {
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T->getSize().Profile(ID);
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VisitArrayType(T);
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}
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void VisitDependentSizedArrayType(const DependentSizedArrayType *T) {
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AddStmt(T->getSizeExpr());
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VisitArrayType(T);
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}
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void VisitIncompleteArrayType(const IncompleteArrayType *T) {
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VisitArrayType(T);
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}
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void VisitVariableArrayType(const VariableArrayType *T) {
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AddStmt(T->getSizeExpr());
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VisitArrayType(T);
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}
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void VisitBuiltinType(const BuiltinType *T) {
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ID.AddInteger(T->getKind());
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VisitType(T);
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}
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void VisitFunctionType(const FunctionType *T) {
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AddQualType(T->getReturnType());
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T->getExtInfo().Profile(ID);
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Hash.AddBoolean(T->isConst());
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Hash.AddBoolean(T->isVolatile());
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Hash.AddBoolean(T->isRestrict());
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VisitType(T);
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}
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void VisitFunctionNoProtoType(const FunctionNoProtoType *T) {
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VisitFunctionType(T);
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}
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void VisitFunctionProtoType(const FunctionProtoType *T) {
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ID.AddInteger(T->getNumParams());
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for (auto ParamType : T->getParamTypes())
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AddQualType(ParamType);
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VisitFunctionType(T);
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}
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void VisitTypedefType(const TypedefType *T) {
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AddDecl(T->getDecl());
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QualType UnderlyingType = T->getDecl()->getUnderlyingType();
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VisitQualifiers(UnderlyingType.getQualifiers());
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while (const TypedefType *Underlying =
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dyn_cast<TypedefType>(UnderlyingType.getTypePtr())) {
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UnderlyingType = Underlying->getDecl()->getUnderlyingType();
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}
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AddType(UnderlyingType.getTypePtr());
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VisitType(T);
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}
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void VisitTagType(const TagType *T) {
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AddDecl(T->getDecl());
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VisitType(T);
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}
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void VisitRecordType(const RecordType *T) { VisitTagType(T); }
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void VisitEnumType(const EnumType *T) { VisitTagType(T); }
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|
|
void VisitTypeWithKeyword(const TypeWithKeyword *T) {
|
|
ID.AddInteger(T->getKeyword());
|
|
VisitType(T);
|
|
};
|
|
|
|
void VisitDependentNameType(const DependentNameType *T) {
|
|
AddNestedNameSpecifier(T->getQualifier());
|
|
AddIdentifierInfo(T->getIdentifier());
|
|
VisitTypeWithKeyword(T);
|
|
}
|
|
|
|
void VisitDependentTemplateSpecializationType(
|
|
const DependentTemplateSpecializationType *T) {
|
|
AddIdentifierInfo(T->getIdentifier());
|
|
AddNestedNameSpecifier(T->getQualifier());
|
|
ID.AddInteger(T->getNumArgs());
|
|
for (const auto &TA : T->template_arguments()) {
|
|
Hash.AddTemplateArgument(TA);
|
|
}
|
|
VisitTypeWithKeyword(T);
|
|
}
|
|
|
|
void VisitElaboratedType(const ElaboratedType *T) {
|
|
AddNestedNameSpecifier(T->getQualifier());
|
|
AddQualType(T->getNamedType());
|
|
VisitTypeWithKeyword(T);
|
|
}
|
|
|
|
void VisitTemplateSpecializationType(const TemplateSpecializationType *T) {
|
|
ID.AddInteger(T->getNumArgs());
|
|
for (const auto &TA : T->template_arguments()) {
|
|
Hash.AddTemplateArgument(TA);
|
|
}
|
|
Hash.AddTemplateName(T->getTemplateName());
|
|
VisitType(T);
|
|
}
|
|
|
|
void VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
|
|
ID.AddInteger(T->getDepth());
|
|
ID.AddInteger(T->getIndex());
|
|
Hash.AddBoolean(T->isParameterPack());
|
|
AddDecl(T->getDecl());
|
|
}
|
|
};
|
|
|
|
void ODRHash::AddType(const Type *T) {
|
|
assert(T && "Expecting non-null pointer.");
|
|
auto Result = TypeMap.insert(std::make_pair(T, TypeMap.size()));
|
|
ID.AddInteger(Result.first->second);
|
|
// On first encounter of a Type pointer, process it. Every time afterwards,
|
|
// only the index value is needed.
|
|
if (!Result.second) {
|
|
return;
|
|
}
|
|
|
|
ODRTypeVisitor(ID, *this).Visit(T);
|
|
}
|
|
|
|
void ODRHash::AddQualType(QualType T) {
|
|
AddBoolean(T.isNull());
|
|
if (T.isNull())
|
|
return;
|
|
SplitQualType split = T.split();
|
|
ID.AddInteger(split.Quals.getAsOpaqueValue());
|
|
AddType(split.Ty);
|
|
}
|
|
|
|
void ODRHash::AddBoolean(bool Value) {
|
|
Bools.push_back(Value);
|
|
}
|