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//===----------------------------------------------------------------------===//
//
// Copyright (c) 2012, 2013, 2015 The University of Utah
// All rights reserved.
//
// This file is distributed under the University of Illinois Open Source
// License. See the file COPYING for details.
//
//===----------------------------------------------------------------------===//
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include "ReplaceClassWithBaseTemplateSpec.h"
#include "clang/Basic/SourceManager.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/ASTContext.h"
#include "TransformationManager.h"
using namespace clang;
using namespace llvm;
static const char *DescriptionMsg =
"This pass tries to replace a class with its base class if \n\
* this class has only one base class, and \n\
* this class doesn't have any explicit declaration, and \n\
* the base class is a class template specialization \n\
";
static RegisterTransformation<ReplaceClassWithBaseTemplateSpec>
Trans("replace-class-with-base-template-spec", DescriptionMsg);
class ReplaceClassWithBaseTemplateSpecVisitor : public
RecursiveASTVisitor<ReplaceClassWithBaseTemplateSpecVisitor> {
public:
explicit ReplaceClassWithBaseTemplateSpecVisitor(
ReplaceClassWithBaseTemplateSpec *Instance)
: ConsumerInstance(Instance)
{ }
bool VisitCXXRecordDecl(CXXRecordDecl *CXXRD);
private:
ReplaceClassWithBaseTemplateSpec *ConsumerInstance;
};
bool ReplaceClassWithBaseTemplateSpecVisitor::VisitCXXRecordDecl(
CXXRecordDecl *CXXRD)
{
if (ConsumerInstance->isInIncludedFile(CXXRD) ||
ConsumerInstance->isSpecialRecordDecl(CXXRD) ||
!CXXRD->hasDefinition())
return true;
ConsumerInstance->handleOneCXXRecordDecl(CXXRD->getDefinition());
return true;
}
class ReplaceClassWithBaseTemplateSpecRewriteVisitor : public
RecursiveASTVisitor<ReplaceClassWithBaseTemplateSpecRewriteVisitor> {
public:
explicit ReplaceClassWithBaseTemplateSpecRewriteVisitor(
ReplaceClassWithBaseTemplateSpec *Instance)
: ConsumerInstance(Instance)
{ }
bool VisitRecordTypeLoc(RecordTypeLoc TLoc);
private:
ReplaceClassWithBaseTemplateSpec *ConsumerInstance;
};
bool ReplaceClassWithBaseTemplateSpecRewriteVisitor::VisitRecordTypeLoc(
RecordTypeLoc TLoc)
{
const Type *Ty = TLoc.getTypePtr();
if (Ty->isUnionType())
return true;
const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TLoc.getDecl());
if (!RD || (RD->getCanonicalDecl() != ConsumerInstance->TheCXXRecord))
return true;
ConsumerInstance->RewriteHelper->replaceRecordType(
TLoc, ConsumerInstance->TheBaseName + " ");
return true;
}
void ReplaceClassWithBaseTemplateSpec::Initialize(ASTContext &context)
{
Transformation::Initialize(context);
CollectionVisitor = new ReplaceClassWithBaseTemplateSpecVisitor(this);
RewriteVisitor = new ReplaceClassWithBaseTemplateSpecRewriteVisitor(this);
}
void ReplaceClassWithBaseTemplateSpec::HandleTranslationUnit(ASTContext &Ctx)
{
if (TransformationManager::isCLangOpt() ||
TransformationManager::isOpenCLLangOpt()) {
ValidInstanceNum = 0;
}
else {
CollectionVisitor->TraverseDecl(Ctx.getTranslationUnitDecl());
}
if (QueryInstanceOnly)
return;
if (TransformationCounter > ValidInstanceNum) {
TransError = TransMaxInstanceError;
return;
}
TransAssert(TheCXXRecord && "TheCXXRecord is NULL!");
Ctx.getDiagnostics().setSuppressAllDiagnostics(false);
TransAssert(RewriteVisitor && "NULL RewriteVisitor!");
RewriteVisitor->TraverseDecl(Ctx.getTranslationUnitDecl());
removeBaseSpecifier();
if (Ctx.getDiagnostics().hasErrorOccurred() ||
Ctx.getDiagnostics().hasFatalErrorOccurred())
TransError = TransInternalError;
}
void ReplaceClassWithBaseTemplateSpec::handleOneCXXRecordDecl(
const CXXRecordDecl *CXXRD)
{
TransAssert(CXXRD && "NULL CXXRD!");
TransAssert(CXXRD->isThisDeclarationADefinition() && "Not a definition!");
if (getNumExplicitDecls(CXXRD))
return;
if (CXXRD->getNumBases() != 1)
return;
CXXRecordDecl::base_class_const_iterator I = CXXRD->bases_begin();
const CXXBaseSpecifier *BS = I;
const Type *Ty = BS->getType().getTypePtr();
const CXXRecordDecl *Base = getBaseDeclFromType(Ty);
if (!Base || !Base->hasDefinition() || !Base->getDescribedClassTemplate())
return;
ValidInstanceNum++;
if (ValidInstanceNum == TransformationCounter) {
BS->getType().getAsStringInternal(TheBaseName,
Context->getPrintingPolicy());
TheCXXRecord = CXXRD;
}
}
void ReplaceClassWithBaseTemplateSpec::removeBaseSpecifier(void)
{
unsigned NumBases = TheCXXRecord->getNumBases(); (void)NumBases;
TransAssert((NumBases == 1) && "TheCXXRecord can have only one base!");
SourceLocation StartLoc = TheCXXRecord->getLocation();
StartLoc = RewriteHelper->getLocationUntil(StartLoc, ':');
SourceLocation EndLoc = RewriteHelper->getLocationUntil(StartLoc, '{');
EndLoc = EndLoc.getLocWithOffset(-1);
TheRewriter.RemoveText(SourceRange(StartLoc, EndLoc));
}
ReplaceClassWithBaseTemplateSpec::~ReplaceClassWithBaseTemplateSpec(void)
{
delete CollectionVisitor;
delete RewriteVisitor;
}
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