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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 <cassert>
#include <string>
#include <iostream>
#include <fstream>
#include <set>
#include <clang/AST/CXXInheritance.h>
#include "plugin.hxx"
#include "check.hxx"
#include "compat.hxx"
/**
Look for calls where the param is bool but the call-site-arg is pointer.
*/
#ifndef LO_CLANG_SHARED_PLUGINS
namespace
{
class PointerBool : public loplugin::FilteringPlugin<PointerBool>
{
public:
explicit PointerBool(loplugin::InstantiationData const& data)
: FilteringPlugin(data)
{
}
virtual void run() override
{
if (preRun())
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
bool shouldVisitTemplateInstantiations() const { return true; }
bool PreTraverseFunctionDecl(FunctionDecl* decl);
bool PostTraverseFunctionDecl(FunctionDecl* decl, bool);
bool TraverseFunctionDecl(FunctionDecl* decl);
bool VisitCallExpr(CallExpr const*);
private:
llvm::Optional<APSInt> getCallValue(const Expr* arg);
std::vector<FunctionDecl*> functions_;
};
bool PointerBool::PreTraverseFunctionDecl(FunctionDecl* decl)
{
functions_.push_back(decl);
return true;
}
bool PointerBool::PostTraverseFunctionDecl(FunctionDecl*, bool)
{
assert(!functions_.empty());
functions_.pop_back();
return true;
}
bool PointerBool::TraverseFunctionDecl(FunctionDecl* decl)
{
bool ret = true;
if (PreTraverseFunctionDecl(decl))
{
ret = FilteringPlugin::TraverseFunctionDecl(decl);
PostTraverseFunctionDecl(decl, ret);
}
return ret;
}
bool PointerBool::VisitCallExpr(CallExpr const* callExpr)
{
if (ignoreLocation(callExpr))
return true;
// TODO this doesn't currently work, the args and the params don't seem to line up
if (isa<CXXOperatorCallExpr>(callExpr))
return true;
const FunctionDecl* functionDecl;
if (isa<CXXMemberCallExpr>(callExpr))
{
functionDecl = dyn_cast<CXXMemberCallExpr>(callExpr)->getMethodDecl();
}
else
{
functionDecl = callExpr->getDirectCallee();
}
if (!functionDecl)
return true;
unsigned len = std::min(callExpr->getNumArgs(), functionDecl->getNumParams());
for (unsigned i = 0; i < len; ++i)
{
auto param = functionDecl->getParamDecl(i);
auto paramTC = loplugin::TypeCheck(param->getType());
if (!paramTC.AnyBoolean())
continue;
auto arg = callExpr->getArg(i)->IgnoreImpCasts();
auto argTC = loplugin::TypeCheck(arg->getType());
if (argTC.AnyBoolean())
continue;
// sal_Bool is sometimes disguised
if (isa<SubstTemplateTypeParmType>(arg->getType()))
if (arg->getType()->getUnqualifiedDesugaredType()->isSpecificBuiltinType(
clang::BuiltinType::UChar))
continue;
if (arg->getType()->isDependentType())
continue;
if (arg->getType()->isIntegerType())
{
auto ret = getCallValue(arg);
if (ret.hasValue() && (ret.getValue() == 1 || ret.getValue() == 0))
continue;
// something like: priv->m_nLOKFeatures & LOK_FEATURE_DOCUMENT_PASSWORD
if (isa<BinaryOperator>(arg->IgnoreParenImpCasts()))
continue;
// something like: pbEmbolden ? FcTrue : FcFalse
if (isa<ConditionalOperator>(arg->IgnoreParenImpCasts()))
continue;
}
report(DiagnosticsEngine::Warning,
"possibly unwanted implicit conversion when calling bool param", arg->getExprLoc())
<< arg->getSourceRange();
report(DiagnosticsEngine::Note, "method here", param->getLocation())
<< param->getSourceRange();
if (!functions_.empty())
{
auto callerFD = functions_.back();
if (callerFD->isTemplateInstantiation())
report(DiagnosticsEngine::Note, "instantiated from here",
callerFD->getPointOfInstantiation());
}
}
return true;
}
llvm::Optional<APSInt> PointerBool::getCallValue(const Expr* arg)
{
arg = arg->IgnoreParenCasts();
if (auto defArg = dyn_cast<CXXDefaultArgExpr>(arg))
{
arg = defArg->getExpr()->IgnoreParenCasts();
}
// ignore this, it seems to trigger an infinite recursion
if (isa<UnaryExprOrTypeTraitExpr>(arg))
{
return llvm::Optional<APSInt>();
}
APSInt x1;
if (compat::EvaluateAsInt(arg, x1, compiler.getASTContext()))
{
return x1;
}
return llvm::Optional<APSInt>();
}
loplugin::Plugin::Registration<PointerBool> pointerbool("pointerbool");
} // namespace
#endif // LO_CLANG_SHARED_PLUGINS
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
