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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include "clang/Lex/Lexer.h"
#include "compat.hxx"
#include "plugin.hxx"
namespace {
class LiteralToBoolConversion:
public RecursiveASTVisitor<LiteralToBoolConversion>,
public loplugin::RewritePlugin
{
public:
explicit LiteralToBoolConversion(InstantiationData const & data):
RewritePlugin(data) {}
virtual void run() override
{ TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool VisitImplicitCastExpr(ImplicitCastExpr const * expr);
private:
bool isFromCIncludeFile(SourceLocation spellingLocation) const;
bool isMacroBodyExpansion(SourceLocation location) const;
};
bool LiteralToBoolConversion::VisitImplicitCastExpr(
ImplicitCastExpr const * expr)
{
if (ignoreLocation(expr)) {
return true;
}
if (!expr->getType()->isBooleanType()) {
return true;
}
Expr const * sub = expr->getSubExpr()->IgnoreParenCasts();
Expr const * expr2 = expr;
for (;;) {
BinaryOperator const * op = dyn_cast<BinaryOperator>(sub);
if (op == nullptr || op->getOpcode() != BO_Comma) {
break;
}
expr2 = op->getRHS()->IgnoreParenCasts();
sub = expr2;
}
if (sub->getType()->isBooleanType()) {
return true;
}
APSInt res;
if (!sub->isValueDependent()
&& sub->isIntegerConstantExpr(res, compiler.getASTContext())
&& res.getLimitedValue() <= 1)
{
SourceLocation loc { sub->getLocStart() };
while (compiler.getSourceManager().isMacroArgExpansion(loc)) {
loc = compiler.getSourceManager().getImmediateMacroCallerLoc(loc);
}
if (isMacroBodyExpansion(loc)) {
StringRef name { Lexer::getImmediateMacroName(
loc, compiler.getSourceManager(), compiler.getLangOpts()) };
if (name == "sal_False" || name == "sal_True") {
loc = compiler.getSourceManager().getImmediateExpansionRange(
loc).first;
}
if (isFromCIncludeFile(
compiler.getSourceManager().getSpellingLoc(loc)))
{
return true;
}
}
}
if (isa<StringLiteral>(sub)) {
SourceLocation loc { sub->getLocStart() };
if (compiler.getSourceManager().isMacroArgExpansion(loc)
&& (Lexer::getImmediateMacroName(
loc, compiler.getSourceManager(), compiler.getLangOpts())
== "assert"))
{
return true;
}
}
if (isa<IntegerLiteral>(sub) || isa<CharacterLiteral>(sub)
|| isa<FloatingLiteral>(sub) || isa<ImaginaryLiteral>(sub)
|| isa<StringLiteral>(sub))
{
bool rewritten = false;
if (rewriter != nullptr) {
SourceLocation loc { compiler.getSourceManager().getExpansionLoc(
expr->getLocStart()) };
if (compiler.getSourceManager().getExpansionLoc(expr->getLocEnd())
== loc)
{
char const * s = compiler.getSourceManager().getCharacterData(
loc);
unsigned n = Lexer::MeasureTokenLength(
expr->getLocEnd(), compiler.getSourceManager(),
compiler.getLangOpts());
std::string tok { s, n };
if (tok == "sal_False" || tok == "0") {
rewritten = replaceText(
compiler.getSourceManager().getExpansionLoc(
expr->getLocStart()),
n, "false");
} else if (tok == "sal_True" || tok == "1") {
rewritten = replaceText(
compiler.getSourceManager().getExpansionLoc(
expr->getLocStart()),
n, "true");
}
}
}
if (!rewritten) {
report(
DiagnosticsEngine::Warning,
"implicit conversion (%0) of literal of type %1 to %2",
expr2->getLocStart())
<< expr->getCastKindName() << expr->getSubExpr()->getType()
<< expr->getType() << expr2->getSourceRange();
}
} else if (sub->isNullPointerConstant(
compiler.getASTContext(), Expr::NPC_ValueDependentIsNull)
> Expr::NPCK_ZeroExpression)
{
// The test above originally checked for != Expr::NPCK_NotNull, but in non-C++11
// mode we can get also Expr::NPCK_ZeroExpression inside templates, even though
// the expression is actually not a null pointer. Clang bug or C++98 misfeature?
// See Clang's NPCK_ZeroExpression declaration and beginning of isNullPointerConstant().
static_assert( Expr::NPCK_NotNull == 0 && Expr::NPCK_ZeroExpression == 1, "Clang API change" );
report(
DiagnosticsEngine::Warning,
("implicit conversion (%0) of null pointer constant of type %1 to"
" %2"),
expr2->getLocStart())
<< expr->getCastKindName() << expr->getSubExpr()->getType()
<< expr->getType() << expr2->getSourceRange();
} else if (!sub->isValueDependent()
&& sub->isIntegerConstantExpr(res, compiler.getASTContext()))
{
report(
DiagnosticsEngine::Warning,
("implicit conversion (%0) of integer constant expression of type"
" %1 with value %2 to %3"),
expr2->getLocStart())
<< expr->getCastKindName() << expr->getSubExpr()->getType()
<< res.toString(10) << expr->getType() << expr2->getSourceRange();
}
return true;
}
bool LiteralToBoolConversion::isFromCIncludeFile(
SourceLocation spellingLocation) const
{
return !compat::isInMainFile(compiler.getSourceManager(), spellingLocation)
&& (StringRef(
compiler.getSourceManager().getPresumedLoc(spellingLocation)
.getFilename())
.endswith(".h"));
}
bool LiteralToBoolConversion::isMacroBodyExpansion(SourceLocation location)
const
{
#if (__clang_major__ == 3 && __clang_minor__ >= 3) || __clang_major__ > 3
return compiler.getSourceManager().isMacroBodyExpansion(location);
#else
return location.isMacroID()
&& !compiler.getSourceManager().isMacroArgExpansion(location);
#endif
}
loplugin::Plugin::Registration<LiteralToBoolConversion> X(
"literaltoboolconversion", true);
}
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