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ODRHash.cpp
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ODRHash.cpp
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//===-- ODRHash.cpp - Hashing to diagnose ODR failures ----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements the ODRHash class, which calculates a hash based
/// on AST nodes, which is stable across different runs.
///
//===----------------------------------------------------------------------===//
#include "clang/AST/ODRHash.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/NestedNameSpecifier.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/AST/TypeVisitor.h"
using namespace clang;
void ODRHash::AddStmt(const Stmt *S) {
assert(S && "Expecting non-null pointer.");
S->ProcessODRHash(ID, *this);
}
void ODRHash::AddIdentifierInfo(const IdentifierInfo *II) {
assert(II && "Expecting non-null pointer.");
ID.AddString(II->getName());
}
void ODRHash::AddDeclarationName(DeclarationName Name, bool TreatAsDecl) {
if (TreatAsDecl)
// Matches the NamedDecl check in AddDecl
AddBoolean(true);
AddDeclarationNameImpl(Name);
if (TreatAsDecl)
// Matches the ClassTemplateSpecializationDecl check in AddDecl
AddBoolean(false);
}
void ODRHash::AddDeclarationNameImpl(DeclarationName Name) {
// Index all DeclarationName and use index numbers to refer to them.
auto Result = DeclNameMap.insert(std::make_pair(Name, DeclNameMap.size()));
ID.AddInteger(Result.first->second);
if (!Result.second) {
// If found in map, the DeclarationName has previously been processed.
return;
}
// First time processing each DeclarationName, also process its details.
AddBoolean(Name.isEmpty());
if (Name.isEmpty())
return;
auto Kind = Name.getNameKind();
ID.AddInteger(Kind);
switch (Kind) {
case DeclarationName::Identifier:
AddIdentifierInfo(Name.getAsIdentifierInfo());
break;
case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCMultiArgSelector: {
Selector S = Name.getObjCSelector();
AddBoolean(S.isNull());
AddBoolean(S.isKeywordSelector());
AddBoolean(S.isUnarySelector());
unsigned NumArgs = S.getNumArgs();
ID.AddInteger(NumArgs);
// Compare all selector slots. For selectors with arguments it means all arg
// slots. And if there are no arguments, compare the first-and-only slot.
unsigned SlotsToCheck = NumArgs > 0 ? NumArgs : 1;
for (unsigned i = 0; i < SlotsToCheck; ++i) {
const IdentifierInfo *II = S.getIdentifierInfoForSlot(i);
AddBoolean(II);
if (II) {
AddIdentifierInfo(II);
}
}
break;
}
case DeclarationName::CXXConstructorName:
case DeclarationName::CXXDestructorName:
AddQualType(Name.getCXXNameType());
break;
case DeclarationName::CXXOperatorName:
ID.AddInteger(Name.getCXXOverloadedOperator());
break;
case DeclarationName::CXXLiteralOperatorName:
AddIdentifierInfo(Name.getCXXLiteralIdentifier());
break;
case DeclarationName::CXXConversionFunctionName:
AddQualType(Name.getCXXNameType());
break;
case DeclarationName::CXXUsingDirective:
break;
case DeclarationName::CXXDeductionGuideName: {
auto *Template = Name.getCXXDeductionGuideTemplate();
AddBoolean(Template);
if (Template) {
AddDecl(Template);
}
}
}
}
void ODRHash::AddNestedNameSpecifier(const NestedNameSpecifier *NNS) {
assert(NNS && "Expecting non-null pointer.");
const auto *Prefix = NNS->getPrefix();
AddBoolean(Prefix);
if (Prefix) {
AddNestedNameSpecifier(Prefix);
}
auto Kind = NNS->getKind();
ID.AddInteger(Kind);
switch (Kind) {
case NestedNameSpecifier::Identifier:
AddIdentifierInfo(NNS->getAsIdentifier());
break;
case NestedNameSpecifier::Namespace:
AddDecl(NNS->getAsNamespace());
break;
case NestedNameSpecifier::NamespaceAlias:
AddDecl(NNS->getAsNamespaceAlias());
break;
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate:
AddType(NNS->getAsType());
break;
case NestedNameSpecifier::Global:
case NestedNameSpecifier::Super:
break;
}
}
void ODRHash::AddTemplateName(TemplateName Name) {
auto Kind = Name.getKind();
ID.AddInteger(Kind);
switch (Kind) {
case TemplateName::Template:
AddDecl(Name.getAsTemplateDecl());
break;
// TODO: Support these cases.
case TemplateName::OverloadedTemplate:
case TemplateName::AssumedTemplate:
case TemplateName::QualifiedTemplate:
case TemplateName::DependentTemplate:
case TemplateName::SubstTemplateTemplateParm:
case TemplateName::SubstTemplateTemplateParmPack:
case TemplateName::UsingTemplate:
break;
}
}
void ODRHash::AddTemplateArgument(TemplateArgument TA) {
const auto Kind = TA.getKind();
ID.AddInteger(Kind);
switch (Kind) {
case TemplateArgument::Null:
llvm_unreachable("Expected valid TemplateArgument");
case TemplateArgument::Type:
AddQualType(TA.getAsType());
break;
case TemplateArgument::Declaration:
AddDecl(TA.getAsDecl());
break;
case TemplateArgument::NullPtr:
ID.AddPointer(nullptr);
break;
case TemplateArgument::Integral: {
// There are integrals (e.g.: _BitInt(128)) that cannot be represented as
// any builtin integral type, so we use the hash of APSInt instead.
TA.getAsIntegral().Profile(ID);
break;
}
case TemplateArgument::Template:
case TemplateArgument::TemplateExpansion:
AddTemplateName(TA.getAsTemplateOrTemplatePattern());
break;
case TemplateArgument::Expression:
AddStmt(TA.getAsExpr());
break;
case TemplateArgument::Pack:
ID.AddInteger(TA.pack_size());
for (auto SubTA : TA.pack_elements()) {
AddTemplateArgument(SubTA);
}
break;
}
}
void ODRHash::AddTemplateParameterList(const TemplateParameterList *TPL) {
assert(TPL && "Expecting non-null pointer.");
ID.AddInteger(TPL->size());
for (auto *ND : TPL->asArray()) {
AddSubDecl(ND);
}
}
void ODRHash::clear() {
DeclNameMap.clear();
Bools.clear();
ID.clear();
}
unsigned ODRHash::CalculateHash() {
// Append the bools to the end of the data segment backwards. This allows
// for the bools data to be compressed 32 times smaller compared to using
// ID.AddBoolean
const unsigned unsigned_bits = sizeof(unsigned) * CHAR_BIT;
const unsigned size = Bools.size();
const unsigned remainder = size % unsigned_bits;
const unsigned loops = size / unsigned_bits;
auto I = Bools.rbegin();
unsigned value = 0;
for (unsigned i = 0; i < remainder; ++i) {
value <<= 1;
value |= *I;
++I;
}
ID.AddInteger(value);
for (unsigned i = 0; i < loops; ++i) {
value = 0;
for (unsigned j = 0; j < unsigned_bits; ++j) {
value <<= 1;
value |= *I;
++I;
}
ID.AddInteger(value);
}
assert(I == Bools.rend());
Bools.clear();
return ID.ComputeHash();
}
namespace {
// Process a Decl pointer. Add* methods call back into ODRHash while Visit*
// methods process the relevant parts of the Decl.
class ODRDeclVisitor : public ConstDeclVisitor<ODRDeclVisitor> {
typedef ConstDeclVisitor<ODRDeclVisitor> Inherited;
llvm::FoldingSetNodeID &ID;
ODRHash &Hash;
public:
ODRDeclVisitor(llvm::FoldingSetNodeID &ID, ODRHash &Hash)
: ID(ID), Hash(Hash) {}
void AddStmt(const Stmt *S) {
Hash.AddBoolean(S);
if (S) {
Hash.AddStmt(S);
}
}
void AddIdentifierInfo(const IdentifierInfo *II) {
Hash.AddBoolean(II);
if (II) {
Hash.AddIdentifierInfo(II);
}
}
void AddQualType(QualType T) {
Hash.AddQualType(T);
}
void AddDecl(const Decl *D) {
Hash.AddBoolean(D);
if (D) {
Hash.AddDecl(D);
}
}
void AddTemplateArgument(TemplateArgument TA) {
Hash.AddTemplateArgument(TA);
}
void Visit(const Decl *D) {
ID.AddInteger(D->getKind());
Inherited::Visit(D);
}
void VisitNamedDecl(const NamedDecl *D) {
Hash.AddDeclarationName(D->getDeclName());
Inherited::VisitNamedDecl(D);
}
void VisitValueDecl(const ValueDecl *D) {
if (!isa<FunctionDecl>(D)) {
AddQualType(D->getType());
}
Inherited::VisitValueDecl(D);
}
void VisitVarDecl(const VarDecl *D) {
Hash.AddBoolean(D->isStaticLocal());
Hash.AddBoolean(D->isConstexpr());
const bool HasInit = D->hasInit();
Hash.AddBoolean(HasInit);
if (HasInit) {
AddStmt(D->getInit());
}
Inherited::VisitVarDecl(D);
}
void VisitParmVarDecl(const ParmVarDecl *D) {
// TODO: Handle default arguments.
Inherited::VisitParmVarDecl(D);
}
void VisitAccessSpecDecl(const AccessSpecDecl *D) {
ID.AddInteger(D->getAccess());
Inherited::VisitAccessSpecDecl(D);
}
void VisitStaticAssertDecl(const StaticAssertDecl *D) {
AddStmt(D->getAssertExpr());
AddStmt(D->getMessage());
Inherited::VisitStaticAssertDecl(D);
}
void VisitFieldDecl(const FieldDecl *D) {
const bool IsBitfield = D->isBitField();
Hash.AddBoolean(IsBitfield);
if (IsBitfield) {
AddStmt(D->getBitWidth());
}
Hash.AddBoolean(D->isMutable());
AddStmt(D->getInClassInitializer());
Inherited::VisitFieldDecl(D);
}
void VisitObjCIvarDecl(const ObjCIvarDecl *D) {
ID.AddInteger(D->getCanonicalAccessControl());
Inherited::VisitObjCIvarDecl(D);
}
void VisitObjCPropertyDecl(const ObjCPropertyDecl *D) {
ID.AddInteger(D->getPropertyAttributes());
ID.AddInteger(D->getPropertyImplementation());
AddQualType(D->getType());
AddDecl(D);
Inherited::VisitObjCPropertyDecl(D);
}
void VisitFunctionDecl(const FunctionDecl *D) {
// Handled by the ODRHash for FunctionDecl
ID.AddInteger(D->getODRHash());
Inherited::VisitFunctionDecl(D);
}
void VisitCXXMethodDecl(const CXXMethodDecl *D) {
// Handled by the ODRHash for FunctionDecl
Inherited::VisitCXXMethodDecl(D);
}
void VisitObjCMethodDecl(const ObjCMethodDecl *Method) {
ID.AddInteger(Method->getDeclKind());
Hash.AddBoolean(Method->isInstanceMethod()); // false if class method
Hash.AddBoolean(Method->isVariadic());
Hash.AddBoolean(Method->isSynthesizedAccessorStub());
Hash.AddBoolean(Method->isDefined());
Hash.AddBoolean(Method->isDirectMethod());
Hash.AddBoolean(Method->isThisDeclarationADesignatedInitializer());
Hash.AddBoolean(Method->hasSkippedBody());
ID.AddInteger(Method->getImplementationControl());
ID.AddInteger(Method->getMethodFamily());
ImplicitParamDecl *Cmd = Method->getCmdDecl();
Hash.AddBoolean(Cmd);
if (Cmd)
ID.AddInteger(Cmd->getParameterKind());
ImplicitParamDecl *Self = Method->getSelfDecl();
Hash.AddBoolean(Self);
if (Self)
ID.AddInteger(Self->getParameterKind());
AddDecl(Method);
AddQualType(Method->getReturnType());
ID.AddInteger(Method->param_size());
for (auto Param : Method->parameters())
Hash.AddSubDecl(Param);
if (Method->hasBody()) {
const bool IsDefinition = Method->isThisDeclarationADefinition();
Hash.AddBoolean(IsDefinition);
if (IsDefinition) {
Stmt *Body = Method->getBody();
Hash.AddBoolean(Body);
if (Body)
AddStmt(Body);
// Filter out sub-Decls which will not be processed in order to get an
// accurate count of Decl's.
llvm::SmallVector<const Decl *, 16> Decls;
for (Decl *SubDecl : Method->decls())
if (ODRHash::isSubDeclToBeProcessed(SubDecl, Method))
Decls.push_back(SubDecl);
ID.AddInteger(Decls.size());
for (auto SubDecl : Decls)
Hash.AddSubDecl(SubDecl);
}
} else {
Hash.AddBoolean(false);
}
Inherited::VisitObjCMethodDecl(Method);
}
void VisitTypedefNameDecl(const TypedefNameDecl *D) {
AddQualType(D->getUnderlyingType());
Inherited::VisitTypedefNameDecl(D);
}
void VisitTypedefDecl(const TypedefDecl *D) {
Inherited::VisitTypedefDecl(D);
}
void VisitTypeAliasDecl(const TypeAliasDecl *D) {
Inherited::VisitTypeAliasDecl(D);
}
void VisitFriendDecl(const FriendDecl *D) {
TypeSourceInfo *TSI = D->getFriendType();
Hash.AddBoolean(TSI);
if (TSI) {
AddQualType(TSI->getType());
} else {
AddDecl(D->getFriendDecl());
}
}
void VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *D) {
// Only care about default arguments as part of the definition.
const bool hasDefaultArgument =
D->hasDefaultArgument() && !D->defaultArgumentWasInherited();
Hash.AddBoolean(hasDefaultArgument);
if (hasDefaultArgument) {
AddTemplateArgument(D->getDefaultArgument());
}
Hash.AddBoolean(D->isParameterPack());
const TypeConstraint *TC = D->getTypeConstraint();
Hash.AddBoolean(TC != nullptr);
if (TC)
AddStmt(TC->getImmediatelyDeclaredConstraint());
Inherited::VisitTemplateTypeParmDecl(D);
}
void VisitNonTypeTemplateParmDecl(const NonTypeTemplateParmDecl *D) {
// Only care about default arguments as part of the definition.
const bool hasDefaultArgument =
D->hasDefaultArgument() && !D->defaultArgumentWasInherited();
Hash.AddBoolean(hasDefaultArgument);
if (hasDefaultArgument) {
AddStmt(D->getDefaultArgument());
}
Hash.AddBoolean(D->isParameterPack());
Inherited::VisitNonTypeTemplateParmDecl(D);
}
void VisitTemplateTemplateParmDecl(const TemplateTemplateParmDecl *D) {
// Only care about default arguments as part of the definition.
const bool hasDefaultArgument =
D->hasDefaultArgument() && !D->defaultArgumentWasInherited();
Hash.AddBoolean(hasDefaultArgument);
if (hasDefaultArgument) {
AddTemplateArgument(D->getDefaultArgument().getArgument());
}
Hash.AddBoolean(D->isParameterPack());
Inherited::VisitTemplateTemplateParmDecl(D);
}
void VisitTemplateDecl(const TemplateDecl *D) {
Hash.AddTemplateParameterList(D->getTemplateParameters());
Inherited::VisitTemplateDecl(D);
}
void VisitRedeclarableTemplateDecl(const RedeclarableTemplateDecl *D) {
Hash.AddBoolean(D->isMemberSpecialization());
Inherited::VisitRedeclarableTemplateDecl(D);
}
void VisitFunctionTemplateDecl(const FunctionTemplateDecl *D) {
AddDecl(D->getTemplatedDecl());
ID.AddInteger(D->getTemplatedDecl()->getODRHash());
Inherited::VisitFunctionTemplateDecl(D);
}
void VisitEnumConstantDecl(const EnumConstantDecl *D) {
AddStmt(D->getInitExpr());
Inherited::VisitEnumConstantDecl(D);
}
};
} // namespace
// Only allow a small portion of Decl's to be processed. Remove this once
// all Decl's can be handled.
bool ODRHash::isSubDeclToBeProcessed(const Decl *D, const DeclContext *Parent) {
if (D->isImplicit()) return false;
if (D->getDeclContext() != Parent) return false;
switch (D->getKind()) {
default:
return false;
case Decl::AccessSpec:
case Decl::CXXConstructor:
case Decl::CXXDestructor:
case Decl::CXXMethod:
case Decl::EnumConstant: // Only found in EnumDecl's.
case Decl::Field:
case Decl::Friend:
case Decl::FunctionTemplate:
case Decl::StaticAssert:
case Decl::TypeAlias:
case Decl::Typedef:
case Decl::Var:
case Decl::ObjCMethod:
case Decl::ObjCIvar:
case Decl::ObjCProperty:
return true;
}
}
void ODRHash::AddSubDecl(const Decl *D) {
assert(D && "Expecting non-null pointer.");
ODRDeclVisitor(ID, *this).Visit(D);
}
void ODRHash::AddCXXRecordDecl(const CXXRecordDecl *Record) {
assert(Record && Record->hasDefinition() &&
"Expected non-null record to be a definition.");
const DeclContext *DC = Record;
while (DC) {
if (isa<ClassTemplateSpecializationDecl>(DC)) {
return;
}
DC = DC->getParent();
}
AddDecl(Record);
// Filter out sub-Decls which will not be processed in order to get an
// accurate count of Decl's.
llvm::SmallVector<const Decl *, 16> Decls;
for (Decl *SubDecl : Record->decls()) {
if (isSubDeclToBeProcessed(SubDecl, Record)) {
Decls.push_back(SubDecl);
if (auto *Function = dyn_cast<FunctionDecl>(SubDecl)) {
// Compute/Preload ODRHash into FunctionDecl.
Function->getODRHash();
}
}
}
ID.AddInteger(Decls.size());
for (auto SubDecl : Decls) {
AddSubDecl(SubDecl);
}
const ClassTemplateDecl *TD = Record->getDescribedClassTemplate();
AddBoolean(TD);
if (TD) {
AddTemplateParameterList(TD->getTemplateParameters());
}
ID.AddInteger(Record->getNumBases());
auto Bases = Record->bases();
for (const auto &Base : Bases) {
AddQualType(Base.getType());
ID.AddInteger(Base.isVirtual());
ID.AddInteger(Base.getAccessSpecifierAsWritten());
}
}
void ODRHash::AddRecordDecl(const RecordDecl *Record) {
assert(!isa<CXXRecordDecl>(Record) &&
"For CXXRecordDecl should call AddCXXRecordDecl.");
AddDecl(Record);
// Filter out sub-Decls which will not be processed in order to get an
// accurate count of Decl's.
llvm::SmallVector<const Decl *, 16> Decls;
for (Decl *SubDecl : Record->decls()) {
if (isSubDeclToBeProcessed(SubDecl, Record))
Decls.push_back(SubDecl);
}
ID.AddInteger(Decls.size());
for (const Decl *SubDecl : Decls)
AddSubDecl(SubDecl);
}
void ODRHash::AddObjCInterfaceDecl(const ObjCInterfaceDecl *IF) {
AddDecl(IF);
auto *SuperClass = IF->getSuperClass();
AddBoolean(SuperClass);
if (SuperClass)
ID.AddInteger(SuperClass->getODRHash());
// Hash referenced protocols.
ID.AddInteger(IF->getReferencedProtocols().size());
for (const ObjCProtocolDecl *RefP : IF->protocols()) {
// Hash the name only as a referenced protocol can be a forward declaration.
AddDeclarationName(RefP->getDeclName());
}
// Filter out sub-Decls which will not be processed in order to get an
// accurate count of Decl's.
llvm::SmallVector<const Decl *, 16> Decls;
for (Decl *SubDecl : IF->decls())
if (isSubDeclToBeProcessed(SubDecl, IF))
Decls.push_back(SubDecl);
ID.AddInteger(Decls.size());
for (auto *SubDecl : Decls)
AddSubDecl(SubDecl);
}
void ODRHash::AddFunctionDecl(const FunctionDecl *Function,
bool SkipBody) {
assert(Function && "Expecting non-null pointer.");
// Skip functions that are specializations or in specialization context.
const DeclContext *DC = Function;
while (DC) {
if (isa<ClassTemplateSpecializationDecl>(DC)) return;
if (auto *F = dyn_cast<FunctionDecl>(DC)) {
if (F->isFunctionTemplateSpecialization()) {
if (!isa<CXXMethodDecl>(DC)) return;
if (DC->getLexicalParent()->isFileContext()) return;
// Inline method specializations are the only supported
// specialization for now.
}
}
DC = DC->getParent();
}
ID.AddInteger(Function->getDeclKind());
const auto *SpecializationArgs = Function->getTemplateSpecializationArgs();
AddBoolean(SpecializationArgs);
if (SpecializationArgs) {
ID.AddInteger(SpecializationArgs->size());
for (const TemplateArgument &TA : SpecializationArgs->asArray()) {
AddTemplateArgument(TA);
}
}
if (const auto *Method = dyn_cast<CXXMethodDecl>(Function)) {
AddBoolean(Method->isConst());
AddBoolean(Method->isVolatile());
}
ID.AddInteger(Function->getStorageClass());
AddBoolean(Function->isInlineSpecified());
AddBoolean(Function->isVirtualAsWritten());
AddBoolean(Function->isPure());
AddBoolean(Function->isDeletedAsWritten());
AddBoolean(Function->isExplicitlyDefaulted());
AddDecl(Function);
AddQualType(Function->getReturnType());
ID.AddInteger(Function->param_size());
for (auto *Param : Function->parameters())
AddSubDecl(Param);
if (SkipBody) {
AddBoolean(false);
return;
}
const bool HasBody = Function->isThisDeclarationADefinition() &&
!Function->isDefaulted() && !Function->isDeleted() &&
!Function->isLateTemplateParsed();
AddBoolean(HasBody);
if (!HasBody) {
return;
}
auto *Body = Function->getBody();
AddBoolean(Body);
if (Body)
AddStmt(Body);
// Filter out sub-Decls which will not be processed in order to get an
// accurate count of Decl's.
llvm::SmallVector<const Decl *, 16> Decls;
for (Decl *SubDecl : Function->decls()) {
if (isSubDeclToBeProcessed(SubDecl, Function)) {
Decls.push_back(SubDecl);
}
}
ID.AddInteger(Decls.size());
for (auto SubDecl : Decls) {
AddSubDecl(SubDecl);
}
}
void ODRHash::AddEnumDecl(const EnumDecl *Enum) {
assert(Enum);
AddDeclarationName(Enum->getDeclName());
AddBoolean(Enum->isScoped());
if (Enum->isScoped())
AddBoolean(Enum->isScopedUsingClassTag());
if (Enum->getIntegerTypeSourceInfo())
AddQualType(Enum->getIntegerType());
// Filter out sub-Decls which will not be processed in order to get an
// accurate count of Decl's.
llvm::SmallVector<const Decl *, 16> Decls;
for (Decl *SubDecl : Enum->decls()) {
if (isSubDeclToBeProcessed(SubDecl, Enum)) {
assert(isa<EnumConstantDecl>(SubDecl) && "Unexpected Decl");
Decls.push_back(SubDecl);
}
}
ID.AddInteger(Decls.size());
for (auto SubDecl : Decls) {
AddSubDecl(SubDecl);
}
}
void ODRHash::AddObjCProtocolDecl(const ObjCProtocolDecl *P) {
AddDecl(P);
// Hash referenced protocols.
ID.AddInteger(P->getReferencedProtocols().size());
for (const ObjCProtocolDecl *RefP : P->protocols()) {
// Hash the name only as a referenced protocol can be a forward declaration.
AddDeclarationName(RefP->getDeclName());
}
// Filter out sub-Decls which will not be processed in order to get an
// accurate count of Decl's.
llvm::SmallVector<const Decl *, 16> Decls;
for (Decl *SubDecl : P->decls()) {
if (isSubDeclToBeProcessed(SubDecl, P)) {
Decls.push_back(SubDecl);
}
}
ID.AddInteger(Decls.size());
for (auto *SubDecl : Decls) {
AddSubDecl(SubDecl);
}
}
void ODRHash::AddDecl(const Decl *D) {
assert(D && "Expecting non-null pointer.");
D = D->getCanonicalDecl();
const NamedDecl *ND = dyn_cast<NamedDecl>(D);
AddBoolean(ND);
if (!ND) {
ID.AddInteger(D->getKind());
return;
}
AddDeclarationName(ND->getDeclName());
const auto *Specialization =
dyn_cast<ClassTemplateSpecializationDecl>(D);
AddBoolean(Specialization);
if (Specialization) {
const TemplateArgumentList &List = Specialization->getTemplateArgs();
ID.AddInteger(List.size());
for (const TemplateArgument &TA : List.asArray())
AddTemplateArgument(TA);
}
}
namespace {
// Process a Type pointer. Add* methods call back into ODRHash while Visit*
// methods process the relevant parts of the Type.
class ODRTypeVisitor : public TypeVisitor<ODRTypeVisitor> {
typedef TypeVisitor<ODRTypeVisitor> Inherited;
llvm::FoldingSetNodeID &ID;
ODRHash &Hash;
public:
ODRTypeVisitor(llvm::FoldingSetNodeID &ID, ODRHash &Hash)
: ID(ID), Hash(Hash) {}
void AddStmt(Stmt *S) {
Hash.AddBoolean(S);
if (S) {
Hash.AddStmt(S);
}
}
void AddDecl(const Decl *D) {
Hash.AddBoolean(D);
if (D) {
Hash.AddDecl(D);
}
}
void AddQualType(QualType T) {
Hash.AddQualType(T);
}
void AddType(const Type *T) {
Hash.AddBoolean(T);
if (T) {
Hash.AddType(T);
}
}
void AddNestedNameSpecifier(const NestedNameSpecifier *NNS) {
Hash.AddBoolean(NNS);
if (NNS) {
Hash.AddNestedNameSpecifier(NNS);
}
}
void AddIdentifierInfo(const IdentifierInfo *II) {
Hash.AddBoolean(II);
if (II) {
Hash.AddIdentifierInfo(II);
}
}
void VisitQualifiers(Qualifiers Quals) {
ID.AddInteger(Quals.getAsOpaqueValue());
}
// Return the RecordType if the typedef only strips away a keyword.
// Otherwise, return the original type.
static const Type *RemoveTypedef(const Type *T) {
const auto *TypedefT = dyn_cast<TypedefType>(T);
if (!TypedefT) {
return T;
}
const TypedefNameDecl *D = TypedefT->getDecl();
QualType UnderlyingType = D->getUnderlyingType();
if (UnderlyingType.hasLocalQualifiers()) {
return T;
}
const auto *ElaboratedT = dyn_cast<ElaboratedType>(UnderlyingType);
if (!ElaboratedT) {
return T;
}
if (ElaboratedT->getQualifier() != nullptr) {
return T;
}
QualType NamedType = ElaboratedT->getNamedType();
if (NamedType.hasLocalQualifiers()) {
return T;
}
const auto *RecordT = dyn_cast<RecordType>(NamedType);
if (!RecordT) {
return T;
}
const IdentifierInfo *TypedefII = TypedefT->getDecl()->getIdentifier();
const IdentifierInfo *RecordII = RecordT->getDecl()->getIdentifier();
if (!TypedefII || !RecordII ||
TypedefII->getName() != RecordII->getName()) {
return T;
}
return RecordT;
}
void Visit(const Type *T) {
T = RemoveTypedef(T);
ID.AddInteger(T->getTypeClass());
Inherited::Visit(T);
}
void VisitType(const Type *T) {}
void VisitAdjustedType(const AdjustedType *T) {
QualType Original = T->getOriginalType();
QualType Adjusted = T->getAdjustedType();
// The original type and pointee type can be the same, as in the case of
// function pointers decaying to themselves. Set a bool and only process
// the type once, to prevent doubling the work.
SplitQualType split = Adjusted.split();
if (auto Pointer = dyn_cast<PointerType>(split.Ty)) {
if (Pointer->getPointeeType() == Original) {
Hash.AddBoolean(true);
ID.AddInteger(split.Quals.getAsOpaqueValue());
AddQualType(Original);
VisitType(T);
return;
}
}
// The original type and pointee type are different, such as in the case
// of a array decaying to an element pointer. Set a bool to false and
// process both types.
Hash.AddBoolean(false);
AddQualType(Original);
AddQualType(Adjusted);
VisitType(T);
}
void VisitDecayedType(const DecayedType *T) {
// getDecayedType and getPointeeType are derived from getAdjustedType
// and don't need to be separately processed.
VisitAdjustedType(T);
}
void VisitArrayType(const ArrayType *T) {
AddQualType(T->getElementType());
ID.AddInteger(T->getSizeModifier());
VisitQualifiers(T->getIndexTypeQualifiers());
VisitType(T);
}
void VisitConstantArrayType(const ConstantArrayType *T) {
T->getSize().Profile(ID);
VisitArrayType(T);
}
void VisitDependentSizedArrayType(const DependentSizedArrayType *T) {
AddStmt(T->getSizeExpr());
VisitArrayType(T);
}
void VisitIncompleteArrayType(const IncompleteArrayType *T) {
VisitArrayType(T);
}
void VisitVariableArrayType(const VariableArrayType *T) {
AddStmt(T->getSizeExpr());
VisitArrayType(T);
}
void VisitAttributedType(const AttributedType *T) {
ID.AddInteger(T->getAttrKind());
AddQualType(T->getModifiedType());
AddQualType(T->getEquivalentType());
VisitType(T);
}
void VisitBlockPointerType(const BlockPointerType *T) {
AddQualType(T->getPointeeType());
VisitType(T);
}
void VisitBuiltinType(const BuiltinType *T) {
ID.AddInteger(T->getKind());
VisitType(T);
}
void VisitComplexType(const ComplexType *T) {
AddQualType(T->getElementType());
VisitType(T);
}
void VisitDecltypeType(const DecltypeType *T) {
AddStmt(T->getUnderlyingExpr());
AddQualType(T->getUnderlyingType());
VisitType(T);
}