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//===----------------------------------------------------------------------===//
//
// Copyright (c) 2016, 2017 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 "ReplaceArrayAccessWithIndex.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/SourceManager.h"
#include "TransformationManager.h"
#include <iostream>
using namespace clang;
static const char *Description =
"Replace array accesses with the index expression.";
static RegisterTransformation<ReplaceArrayAccessWithIndex>
Trans("replace-array-access-with-index", Description);
class ReplaceArrayAccessWithIndex::IndexCollector
: public RecursiveASTVisitor<ReplaceArrayAccessWithIndex::IndexCollector>
{
public:
explicit IndexCollector(ReplaceArrayAccessWithIndex *instance);
bool VisitArraySubscriptExpr(ArraySubscriptExpr *ASE);
private:
const VarDecl *getVarDeclFromExpr(const Expr *E);
ReplaceArrayAccessWithIndex *ConsumerInstance;
};
ReplaceArrayAccessWithIndex::IndexCollector::IndexCollector(
ReplaceArrayAccessWithIndex *instance)
: ConsumerInstance(instance)
{
// No further initialization needed.
}
bool ReplaceArrayAccessWithIndex::IndexCollector::VisitArraySubscriptExpr(
ArraySubscriptExpr *ASE)
{
// Skip expressions in included files.
if (ConsumerInstance->isInIncludedFile(ASE))
return true;
const VarDecl *BaseVD = getVarDeclFromExpr(ASE->getBase());
if (!BaseVD)
return true;
ArrayType const *ArrayTy = dyn_cast<ArrayType>(BaseVD->getType().getTypePtr());
// Only apply the transformation to one-dimensional arrays of scalars.
if (!ArrayTy || !ArrayTy->getElementType().getTypePtr()->isScalarType())
return true;
ConsumerInstance->ASEs.push_back(ASE);
ConsumerInstance->ValidInstanceNum++;
return true;
}
const VarDecl *ReplaceArrayAccessWithIndex::IndexCollector::getVarDeclFromExpr(
const Expr *E)
{
TransAssert(E && "NULL Expr!");
const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
if (!DRE)
return NULL;
const ValueDecl *OrigDecl = DRE->getDecl();
const VarDecl *VD = dyn_cast<VarDecl>(OrigDecl);
if (!VD)
return NULL;
const VarDecl *CanonicalVD = VD->getCanonicalDecl();
return CanonicalVD;
}
ReplaceArrayAccessWithIndex::~ReplaceArrayAccessWithIndex(void)
{
delete Collector;
}
void ReplaceArrayAccessWithIndex::Initialize(clang::ASTContext &context)
{
Transformation::Initialize(context);
Collector = new IndexCollector(this);
}
void ReplaceArrayAccessWithIndex::HandleTranslationUnit(clang::ASTContext &Ctx)
{
TransAssert(Collector && "NULL Collector");
Collector->TraverseDecl(Ctx.getTranslationUnitDecl());
if (QueryInstanceOnly)
return;
if (TransformationCounter > ValidInstanceNum) {
TransError = TransMaxInstanceError;
return;
}
Ctx.getDiagnostics().setSuppressAllDiagnostics(false);
doRewrite();
if (Ctx.getDiagnostics().hasErrorOccurred() ||
Ctx.getDiagnostics().hasFatalErrorOccurred())
TransError = TransInternalError;
}
void ReplaceArrayAccessWithIndex::doRewrite(void)
{
ArraySubscriptExpr const *ASE = ASEs[TransformationCounter - 1];
Expr const *Idx = ASE->getIdx();
TransAssert(Idx && "Bad Idx!");
std::string IdxStr;
RewriteHelper->getExprString(Idx, IdxStr);
QualType ASEType = ASE->getType().getCanonicalType();
QualType IdxType = Idx->getType().getCanonicalType();
if (ASEType != IdxType) {
IdxStr = std::string("(") + ASEType.getAsString() + std::string(")")+
std::string("(") + IdxStr + std::string(")");
}
RewriteHelper->replaceExpr(ASE, IdxStr);
}
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