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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* 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/.
*/
//TODO: Make this a shared plugin for Clang 12 (and possibly even for older Clang) again.
#include <cassert>
#include <limits>
#include <stack>
#include "clang/Basic/Builtins.h"
#include "check.hxx"
#include "compat.hxx"
#include "plugin.hxx"
// Find implicit conversions from non-'bool' constants (e.g., 'sal_False') to 'bool'.
namespace
{
class ConstToBool final : public loplugin::FilteringPlugin<ConstToBool>
{
public:
explicit ConstToBool(loplugin::InstantiationData const& data)
: FilteringPlugin(data)
{
}
bool PreTraverseLinkageSpecDecl(LinkageSpecDecl*)
{
assert(externCContexts_ != std::numeric_limits<unsigned int>::max()); //TODO
++externCContexts_;
return true;
}
bool PostTraverseLinkageSpecDecl(LinkageSpecDecl*, bool)
{
assert(externCContexts_ != 0);
--externCContexts_;
return true;
}
bool TraverseLinkageSpecDecl(LinkageSpecDecl* decl)
{
bool ret = true;
if (PreTraverseLinkageSpecDecl(decl))
{
ret = FilteringPlugin::TraverseLinkageSpecDecl(decl);
PostTraverseLinkageSpecDecl(decl, ret);
}
return ret;
}
bool PreTraverseUnaryOperator(UnaryOperator* expr)
{
if (expr->getOpcode() == UO_LNot)
{
ignoredInAssert_.push(expr->getSubExpr());
}
return true;
}
bool PostTraverseUnaryOperator(UnaryOperator* expr, bool)
{
if (expr->getOpcode() == UO_LNot)
{
assert(!ignoredInAssert_.empty());
ignoredInAssert_.pop();
}
return true;
}
bool TraverseUnaryOperator(UnaryOperator* expr)
{
bool ret = true;
if (PreTraverseUnaryOperator(expr))
{
ret = FilteringPlugin::TraverseUnaryOperator(expr);
PostTraverseUnaryOperator(expr, ret);
}
return ret;
}
bool PreTraverseBinaryOperator(BinaryOperator* expr)
{
if (expr->getOpcode() == BO_LAnd)
{
ignoredInAssert_.push(expr->getRHS());
}
return true;
}
bool PostTraverseBinaryOperator(BinaryOperator* expr, bool)
{
if (expr->getOpcode() == BO_LAnd)
{
assert(!ignoredInAssert_.empty());
ignoredInAssert_.pop();
}
return true;
}
bool TraverseBinaryOperator(BinaryOperator* expr)
{
bool ret = true;
if (PreTraverseBinaryOperator(expr))
{
ret = FilteringPlugin::TraverseBinaryOperator(expr);
PostTraverseBinaryOperator(expr, ret);
}
return ret;
}
bool VisitImplicitCastExpr(ImplicitCastExpr const* expr)
{
if (ignoreLocation(expr))
{
return true;
}
if (!expr->getType()->isBooleanType())
{
return true;
}
auto const sub = expr->getSubExpr();
auto const t = sub->getType();
if (t->isBooleanType())
{
return true;
}
if (sub->isValueDependent())
{
return true;
}
APValue res;
if (!sub->isCXX11ConstantExpr(compiler.getASTContext(), &res))
{
return true;
}
auto const l = expr->getExprLoc();
if (!ignoredInAssert_.empty() && expr == ignoredInAssert_.top())
{
if (auto const e = dyn_cast<clang::StringLiteral>(sub->IgnoreParenImpCasts()))
{
if (compat::isOrdinary(e)) // somewhat randomly restrict to plain literals
{
if (compiler.getSourceManager().isMacroArgExpansion(l)
&& Lexer::getImmediateMacroName(l, compiler.getSourceManager(),
compiler.getLangOpts())
== "assert")
{
//TODO: only ignore outermost '!"..."' or '... && "..."'
return true;
}
}
}
}
auto l1 = l;
if (compiler.getSourceManager().isMacroBodyExpansion(l1))
{
auto const n = Lexer::getImmediateMacroName(l1, compiler.getSourceManager(),
compiler.getLangOpts());
if (n == "FALSE" || n == "TRUE" || n == "sal_False" || n == "sal_True")
{
l1 = compiler.getSourceManager().getImmediateMacroCallerLoc(l1);
}
// For example, /usr/include/glib-2.0/glib/gmacros.h from
// glib2-devel-2.62.1-1.fc31.x86_64 has
//
// #define TRUE (!FALSE)
//
// so handle that wrapped macro body expansion, too:
if (compiler.getSourceManager().isMacroBodyExpansion(l1)
&& Lexer::getImmediateMacroName(l1, compiler.getSourceManager(),
compiler.getLangOpts())
== "TRUE")
{
l1 = compiler.getSourceManager().getImmediateMacroCallerLoc(l1);
}
}
if (isSharedCAndCppCode(l1))
{
// Cover just enough cases to handle things like `while (0)` or the use of `sal_True` in
//
// #define OSL_FAIL(m) SAL_DETAIL_WARN_IF_FORMAT(sal_True, "legacy.osl", "%s", m)
//
// in include/osl/diagnose.h:
if (auto const t1 = t->getAs<BuiltinType>())
{
if (t1->getKind() == BuiltinType::Int)
{
auto const& v = res.getInt();
if (v == 0 || v == 1)
{
return true;
}
}
}
if (loplugin::TypeCheck(t).Typedef("sal_Bool").GlobalNamespace())
{
return true;
}
}
if (auto const e = dyn_cast<CallExpr>(sub->IgnoreParenImpCasts()))
{
// Ignore use of `long __builtin_expect(long, long)`, as found in the definition of
// `assert` on macOS:
if (e->getBuiltinCallee() == Builtin::BI__builtin_expect)
{
return true;
}
}
bool suggestion;
bool replacement = {};
if (res.isInt())
{
suggestion = true;
replacement = res.getInt() != 0;
}
else if (res.isFloat())
{
suggestion = true;
replacement = !res.getFloat().isZero();
}
else if (res.isNullPointer())
{
suggestion = true;
replacement = false;
}
else if (res.isLValue())
{
suggestion = true;
replacement = true;
}
else
{
suggestion = false;
}
report(DiagnosticsEngine::Warning,
"implicit conversion of constant %0 of type %1 to 'bool'%select{|; use "
"'%select{false|true}3' instead}2",
l)
<< res.getAsString(compiler.getASTContext(), t) << t << suggestion << replacement
<< expr->getSourceRange();
return true;
}
bool preRun() override { return compiler.getLangOpts().CPlusPlus; }
private:
std::stack<Expr const*> ignoredInAssert_;
unsigned int externCContexts_ = 0;
void run() override
{
if (preRun())
{
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
}
bool isFromCIncludeFile(SourceLocation spellingLocation) const
{
return !compiler.getSourceManager().isInMainFile(spellingLocation)
&& compat::ends_with(StringRef(compiler.getSourceManager()
.getPresumedLoc(spellingLocation)
.getFilename()),
".h");
}
bool isSharedCAndCppCode(SourceLocation location) const
{
while (compiler.getSourceManager().isMacroArgExpansion(location))
{
location = compiler.getSourceManager().getImmediateMacroCallerLoc(location);
}
// Assume that code is intended to be shared between C and C++ if it comes from an include
// file ending in .h, and is either in an extern "C" context or the body of a macro
// definition:
return isFromCIncludeFile(compiler.getSourceManager().getSpellingLoc(location))
&& (externCContexts_ != 0
|| compiler.getSourceManager().isMacroBodyExpansion(location));
}
};
loplugin::Plugin::Registration<ConstToBool> consttobool("consttobool");
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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