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//===----------------------------------------------------------------------===//
//
// Copyright (c) 2012, 2015, 2016 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 "MoveGlobalVar.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/SourceManager.h"
#include "TransformationManager.h"
using namespace clang;
static const char *DescriptionMsg =
"Try to move global var/struct/union declarations above all function \
declarations except printf. Also move the declaration of printf to the top of \
the reduce code if it exists and is not at the top of the code.\n";
static RegisterTransformation<MoveGlobalVar>
Trans("move-global-var", DescriptionMsg);
void MoveGlobalVar::Initialize(ASTContext &context)
{
Transformation::Initialize(context);
}
bool MoveGlobalVar::isSpecialDecl(const std::string &Name)
{
return ((Name == "__va_list_tag") ||
(Name == "__builtin_va_list"));
}
bool MoveGlobalVar::HandleTopLevelDecl(DeclGroupRef D)
{
if (TransformationManager::isCXXLangOpt()) {
ValidInstanceNum = 0;
return true;
}
DeclGroupRef::iterator I = D.begin();
TransAssert((I != D.end()) && "Bad DeclGroupRef!");
if (isInIncludedFile(*I))
return true;
const NamedDecl *ND = dyn_cast<NamedDecl>(*I);
if (!TheFirstDecl && ND && isSpecialDecl(ND->getNameAsString()))
return true;
FunctionDecl *FD = dyn_cast<FunctionDecl>(*I);
if (FD) {
handleFunctionDecl(FD);
}
else {
handleOtherDecl(D);
}
if (!TheFirstDecl)
TheFirstDecl = (*I);
return true;
}
void MoveGlobalVar::HandleTranslationUnit(ASTContext &Ctx)
{
if (QueryInstanceOnly)
return;
if (TransformationCounter > ValidInstanceNum) {
TransError = TransMaxInstanceError;
return;
}
Ctx.getDiagnostics().setSuppressAllDiagnostics(false);
if (ThePrintfDecl)
liftPrintfDecl();
else
liftOtherDecl();
if (Ctx.getDiagnostics().hasErrorOccurred() ||
Ctx.getDiagnostics().hasFatalErrorOccurred())
TransError = TransInternalError;
}
void MoveGlobalVar::handleFunctionDecl(const FunctionDecl *FD)
{
if (FD->getNameAsString() == "printf") {
if (ThePrintfDecl || !TheFirstDecl || FD->isThisDeclarationADefinition())
return;
ValidInstanceNum++;
if (TransformationCounter == ValidInstanceNum)
ThePrintfDecl = FD;
}
else if (!TheFirstFunctionDecl) {
TheFirstFunctionDecl = FD;
}
}
void MoveGlobalVar::handleOtherDecl(DeclGroupRef DGR)
{
if (!TheFirstFunctionDecl)
return;
ValidInstanceNum++;
if (TransformationCounter == ValidInstanceNum)
TheDGRPointer = DGR.getAsOpaquePtr();
}
void MoveGlobalVar::liftPrintfDecl(void)
{
TransAssert(ThePrintfDecl && TheFirstDecl &&
(ThePrintfDecl != TheFirstDecl) && "Invalid printf decl!");
std::string PrintfDeclStr;
RewriteHelper->getFunctionDeclStrAndRemove(ThePrintfDecl, PrintfDeclStr);
SourceRange DeclRange = TheFirstDecl->getSourceRange();
SourceLocation StartLoc = DeclRange.getBegin();
PrintfDeclStr += ";\n";
TheRewriter.InsertTextBefore(StartLoc, PrintfDeclStr);
}
void MoveGlobalVar::liftOtherDecl(void)
{
TransAssert(TheDGRPointer && "NULL DGR pointer!");
TransAssert(TheFirstFunctionDecl && "NULL First Decl!");
DeclGroupRef DGR = DeclGroupRef::getFromOpaquePtr(TheDGRPointer);
std::string DGRStr;
RewriteHelper->getEntireDeclGroupStrAndRemove(DGR, DGRStr);
SourceRange DeclRange = TheFirstFunctionDecl->getSourceRange();
SourceLocation StartLoc = DeclRange.getBegin();
DGRStr += ";\n";
TheRewriter.InsertTextBefore(StartLoc, DGRStr);
}
MoveGlobalVar::~MoveGlobalVar(void)
{
// Nothing to do
}
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