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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 "ReplaceDerivedClass.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/SourceManager.h"
#include "CommonRenameClassRewriteVisitor.h"
#include "TransformationManager.h"
using namespace clang;
using namespace llvm;
using namespace clang_delta_common_visitor;
static const char *DescriptionMsg =
"Replace a derived class with one of its base classes if \n\
* the derived class is empty; \n\
* and if the base class and the derived class are both class templates, \
they require the same number of arguments for instantiation. \n";
static RegisterTransformation<ReplaceDerivedClass>
Trans("replace-derived-class", DescriptionMsg);
class ReplaceDerivedClassASTVisitor : public
RecursiveASTVisitor<ReplaceDerivedClassASTVisitor> {
public:
explicit ReplaceDerivedClassASTVisitor(ReplaceDerivedClass *Instance)
: ConsumerInstance(Instance)
{ }
bool VisitCXXRecordDecl(CXXRecordDecl *CXXRD);
private:
ReplaceDerivedClass *ConsumerInstance;
};
class ReplaceDerivedClassRewriteVisitor : public
CommonRenameClassRewriteVisitor<ReplaceDerivedClassRewriteVisitor>
{
public:
ReplaceDerivedClassRewriteVisitor(Rewriter *RT,
RewriteUtils *Helper,
const CXXRecordDecl *CXXRD,
const std::string &Name)
: CommonRenameClassRewriteVisitor<ReplaceDerivedClassRewriteVisitor>
(RT, Helper, CXXRD, Name)
{ }
};
bool ReplaceDerivedClassASTVisitor::VisitCXXRecordDecl(CXXRecordDecl *CXXRD)
{
ConsumerInstance->handleOneCXXRecordDecl(CXXRD);
return true;
}
void ReplaceDerivedClass::Initialize(ASTContext &context)
{
Transformation::Initialize(context);
CollectionVisitor = new ReplaceDerivedClassASTVisitor(this);
}
void ReplaceDerivedClass::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(TheDerivedClass && "TheDerivedClass is NULL!");
TransAssert(TheBaseClass && "TheBaseClass is NULL!");
Ctx.getDiagnostics().setSuppressAllDiagnostics(false);
RewriteVisitor =
new ReplaceDerivedClassRewriteVisitor(&TheRewriter, RewriteHelper,
TheDerivedClass->getCanonicalDecl(),
TheBaseClass->getNameAsString());
TransAssert(RewriteVisitor && "NULL RewriteVisitor!");
RewriteVisitor->TraverseDecl(Ctx.getTranslationUnitDecl());
doRewrite();
if (Ctx.getDiagnostics().hasErrorOccurred() ||
Ctx.getDiagnostics().hasFatalErrorOccurred())
TransError = TransInternalError;
}
bool ReplaceDerivedClass::isValidBaseDerivedPair(const CXXRecordDecl *Base,
const CXXRecordDecl *Derived)
{
const ClassTemplateDecl *BaseTmplD = Base->getDescribedClassTemplate();
const ClassTemplateDecl *DerivedTmplD = Derived->getDescribedClassTemplate();
if (!BaseTmplD && !DerivedTmplD) {
return true;
}
else if (BaseTmplD && DerivedTmplD) {
return (BaseTmplD->getTemplateParameters()->getMinRequiredArguments() ==
DerivedTmplD->getTemplateParameters()->getMinRequiredArguments());
}
return false;
}
bool ReplaceDerivedClass::isEmptyClass(const CXXRecordDecl *CXXDef)
{
TransAssert(CXXDef->isThisDeclarationADefinition() &&
"CXXDef must be a definition!");
const DeclContext *Ctx = dyn_cast<DeclContext>(CXXDef);
TransAssert(Ctx && "Invalid DeclContext!");
for (DeclContext::decl_iterator I = Ctx->decls_begin(),
E = Ctx->decls_end(); I != E; ++I) {
if (!(*I)->isImplicit())
return false;
}
return true;
}
void ReplaceDerivedClass::handleOneCXXRecordDecl(const CXXRecordDecl *CXXRD)
{
if (isInIncludedFile(CXXRD))
return;
const CXXRecordDecl *CXXDef = CXXRD->getDefinition();
if (!CXXDef)
return;
if (dyn_cast<ClassTemplateSpecializationDecl>(CXXRD))
return;
if ((CXXDef->getNumBases() == 0) || !isEmptyClass(CXXDef))
return;
const CXXRecordDecl *CanonicalRD = CXXRD->getCanonicalDecl();
if (VisitedCXXRecordDecls.count(CanonicalRD))
return;
VisitedCXXRecordDecls.insert(CanonicalRD);
for (CXXRecordDecl::base_class_const_iterator I =
CanonicalRD->bases_begin(), E = CanonicalRD->bases_end(); I != E; ++I) {
const CXXBaseSpecifier *BS = I;
const Type *Ty = BS->getType().getTypePtr();
const CXXRecordDecl *Base = getBaseDeclFromType(Ty);
if (!Base || !isValidBaseDerivedPair(Base, CanonicalRD))
continue;
ValidInstanceNum++;
if (ValidInstanceNum == TransformationCounter) {
TheBaseClass = Base;
TheDerivedClass = CanonicalRD;
}
}
}
void ReplaceDerivedClass::doRewrite(void)
{
if (const ClassTemplateDecl *TmplD =
TheDerivedClass->getDescribedClassTemplate()) {
RewriteHelper->removeClassTemplateDecls(TmplD);
}
else {
RewriteHelper->removeClassDecls(TheDerivedClass);
}
}
ReplaceDerivedClass::~ReplaceDerivedClass(void)
{
delete CollectionVisitor;
delete RewriteVisitor;
}
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