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//===-- UseAuto/UseAutoActions.cpp - Matcher callback impl ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file contains the implementation of the UseAutoFixer class.
///
//===----------------------------------------------------------------------===//
#include "UseAutoActions.h"
#include "UseAutoMatchers.h"
#include "clang/AST/ASTContext.h"
using namespace clang::ast_matchers;
using namespace clang::tooling;
using namespace clang;
void UseAutoFixer::run(const MatchFinder::MatchResult &Result) {
const VarDecl *D = Result.Nodes.getNodeAs<VarDecl>(DeclNodeId);
assert(D && "Bad Callback. No node provided");
SourceManager &SM = *Result.SourceManager;
if (!SM.isFromMainFile(D->getLocStart()))
return;
const Expr *ExprInit = D->getInit();
// Skip expressions with cleanups from the initializer expression.
if (const ExprWithCleanups *E = dyn_cast<ExprWithCleanups>(ExprInit))
ExprInit = E->getSubExpr();
const CXXConstructExpr *Construct = cast<CXXConstructExpr>(ExprInit);
assert(Construct->getNumArgs() == 1u &&
"Expected constructor with single argument");
// Drill down to the as-written initializer.
const Expr *E = Construct->arg_begin()->IgnoreParenImpCasts();
if (E != E->IgnoreConversionOperator())
// We hit a conversion operator. Early-out now as they imply an implicit
// conversion from a different type. Could also mean an explicit conversion
// from the same type but that's pretty rare.
return;
if (const CXXConstructExpr *NestedConstruct = dyn_cast<CXXConstructExpr>(E))
// If we ran into an implicit conversion constructor, can't convert.
//
// FIXME: The following only checks if the constructor can be used
// implicitly, not if it actually was. Cases where the converting constructor
// was used explicitly won't get converted.
if (NestedConstruct->getConstructor()->isConvertingConstructor(false))
return;
if (Result.Context->hasSameType(D->getType(), E->getType())) {
TypeLoc TL = D->getTypeSourceInfo()->getTypeLoc();
// WARNING: TypeLoc::getSourceRange() will include the identifier for things
// like function pointers. Not a concern since this action only works with
// iterators but something to keep in mind in the future.
CharSourceRange Range(TL.getSourceRange(), true);
Replace.insert(tooling::Replacement(SM, Range, "auto"));
++AcceptedChanges;
}
}
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