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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/.
*/
#ifndef LO_CLANG_SHARED_PLUGINS
#include <cassert>
#include "compat.hxx"
#include "plugin.hxx"
namespace {
class RedundantInline:
public loplugin::FilteringRewritePlugin<RedundantInline>
{
public:
explicit RedundantInline(loplugin::InstantiationData const & data):
FilteringRewritePlugin(data) {}
void run() override {
if (preRun())
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
bool VisitFunctionDecl(FunctionDecl const * decl) {
if (ignoreLocation(decl)) {
return true;
}
if (!decl->isInlineSpecified()) {
return true;
}
handleImplicitInline(decl) || handleNonExternalLinkage(decl);
return true;
}
private:
bool removeInline(FunctionDecl const * decl, SourceLocation * inlineLoc) {
assert(inlineLoc != nullptr);
assert(inlineLoc->isInvalid());
unsigned n = {}; // avoid -Werror=maybe-uninitialized
auto end = Lexer::getLocForEndOfToken(
compiler.getSourceManager().getExpansionLoc(decl->getEndLoc()), 0,
compiler.getSourceManager(), compiler.getLangOpts());
assert(end.isValid());
for (auto loc = compiler.getSourceManager().getExpansionLoc(
decl->getBeginLoc());
loc != end; loc = loc.getLocWithOffset(std::max<unsigned>(n, 1)))
{
n = Lexer::MeasureTokenLength(
loc, compiler.getSourceManager(), compiler.getLangOpts());
StringRef s(compiler.getSourceManager().getCharacterData(loc), n);
//TODO: see compilerplugins/clang/override.cxx:
if (compat::starts_with(s, "\\\n")) {
s = s.drop_front(2);
}
if (s == "inline") {
if (!compiler.getSourceManager().isMacroArgExpansion(loc)) {
*inlineLoc = loc;
}
break;
} else if (s == "#") {
// Hard to pick the right 'inline' in code like
//
// #if 1
// static
// #else
// inline
// #endif
// inline void f() {}
//
// so just give up once a preprocessing directive is seen:
break;
}
}
if (rewriter != nullptr && inlineLoc->isValid()) {
for (auto loc = inlineLoc->getLocWithOffset(
std::max<unsigned>(n, 1));;)
{
assert(loc != end);
unsigned n2 = Lexer::MeasureTokenLength(
loc, compiler.getSourceManager(), compiler.getLangOpts());
StringRef s(
compiler.getSourceManager().getCharacterData(loc), n2);
//TODO: see compilerplugins/clang/override.cxx:
if (compat::starts_with(s, "\\\n")) {
s = s.drop_front(2);
}
if (!s.empty()) {
break;
}
n2 = std::max<unsigned>(n2, 1);
n += n2;
loc = loc.getLocWithOffset(n2);
}
if (removeText(*inlineLoc, n, RewriteOptions(RemoveLineIfEmpty))) {
return true;
}
}
return false;
}
SourceLocation unwindTo(SourceLocation const & loc, StringRef name) {
if (!loc.isMacroID()) {
return SourceLocation();
}
auto l = compiler.getSourceManager().getImmediateMacroCallerLoc(loc);
return
(Lexer::getImmediateMacroName(
loc, compiler.getSourceManager(), compiler.getLangOpts())
== name)
? l : unwindTo(l, name);
}
bool isInMacroExpansion(FunctionDecl const * decl, StringRef name) {
auto loc = unwindTo(decl->getBeginLoc(), name);
return loc.isValid() && loc == unwindTo(decl->getEndLoc(), name);
}
bool handleImplicitInline(FunctionDecl const * decl) {
if (!(decl->doesThisDeclarationHaveABody() || decl->isExplicitlyDefaulted())
|| !(decl->getLexicalDeclContext()->isRecord() || decl->isConstexpr()))
{
return false;
}
if (isInMacroExpansion(decl, "Q_OBJECT")) {
return true;
}
SourceLocation inlineLoc;
if (!removeInline(decl, &inlineLoc)) {
report(
DiagnosticsEngine::Warning,
"function definition redundantly declared 'inline'",
inlineLoc.isValid() ? inlineLoc : decl->getBeginLoc())
<< decl->getSourceRange();
}
return true;
}
bool handleNonExternalLinkage(FunctionDecl const * decl) {
if (decl->getLinkageInternal() >= compat::Linkage::Module) {
return false;
}
if (!compiler.getSourceManager().isInMainFile(decl->getLocation())) {
// There *may* be benefit to "static inline" in include files (esp. in C code, where an
// inline function with external linkage still requires an external definition), so
// just ignore those for now:
return true;
}
if (isInMacroExpansion(decl, "G_DEFINE_TYPE")
|| isInMacroExpansion(decl, "G_DEFINE_TYPE_WITH_CODE")
|| isInMacroExpansion(decl, "G_DEFINE_TYPE_WITH_PRIVATE"))
{
return true;
}
SourceLocation inlineLoc;
if (!removeInline(decl, &inlineLoc)) {
report(
DiagnosticsEngine::Warning,
"function has no external linkage but is explicitly declared 'inline'",
inlineLoc.isValid() ? inlineLoc : decl->getBeginLoc())
<< decl->getSourceRange();
}
return true;
}
};
loplugin::Plugin::Registration<RedundantInline> redundantinline("redundantinline");
} // namespace
#endif // LO_CLANG_SHARED_PLUGINS
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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