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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/.
*/
#include <algorithm>
#include <functional>
#include "clang/AST/Comment.h"
#include "plugin.hxx"
// Remove dynamic exception specifications. See the mail thread starting at
// <https://lists.freedesktop.org/archives/libreoffice/2017-January/076665.html>
// "Dynamic Exception Specifications" for details.
namespace {
bool isOverriding(FunctionDecl const * decl) {
return decl->hasAttr<OverrideAttr>();
}
class DynExcSpec:
public RecursiveASTVisitor<DynExcSpec>, public loplugin::RewritePlugin
{
public:
explicit DynExcSpec(InstantiationData const & data): RewritePlugin(data) {}
void run() override {
// See the mail thread mentioned above for why !LIBO_INTERNAL_ONLY is
// excluded for now:
if (!compiler.getPreprocessor().getIdentifierInfo("LIBO_INTERNAL_ONLY")
->hasMacroDefinition())
{
return;
}
if (compiler.getLangOpts().CPlusPlus) {
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
}
bool VisitFunctionDecl(FunctionDecl const * decl) {
if (ignoreLocation(decl)) {
return true;
}
auto proto = decl->getType()->getAs<FunctionProtoType>();
if (proto == nullptr || proto->getExceptionSpecType() != EST_Dynamic) {
return true;
}
if (decl->isCanonicalDecl() && !isOverriding(decl)
&& !anyRedeclHasThrowsDocumentation(decl))
{
report(
DiagnosticsEngine::Warning,
("function declaration has dynamic exception specification but"
" no corresponding documentation comment"),
decl->getLocation())
<< decl->getSourceRange();
return true;
}
#if 0 // will be enabled later
bool dtor = isa<CXXDestructorDecl>(decl);
auto source = decl->getExceptionSpecSourceRange();
if (rewriter != nullptr && source.isValid()) {
if (dtor) {
if (replaceText(source, "noexcept(false)")) {
return true;
}
} else {
auto beg = source.getBegin();
if (beg.isFileID()) {
for (;;) {
auto prev = Lexer::GetBeginningOfToken(
beg.getLocWithOffset(-1),
compiler.getSourceManager(),
compiler.getLangOpts());
auto n = Lexer::MeasureTokenLength(
prev, compiler.getSourceManager(),
compiler.getLangOpts());
auto s = StringRef(
compiler.getSourceManager().getCharacterData(prev),
n);
while (s.startswith("\\\n")) {
s = s.drop_front(2);
while (!s.empty()
&& (s.front() == ' ' || s.front() == '\t'
|| s.front() == '\n' || s.front() == '\v'
|| s.front() == '\f'))
{
s = s.drop_front(1);
}
}
if (!s.empty() && s != "\\") {
break;
}
beg = prev;
}
}
if (removeText(SourceRange(beg, source.getEnd()))) {
return true;
}
}
}
report(
DiagnosticsEngine::Warning,
(dtor
? "replace dynamic exception specification with 'noexcept(false)'"
: "remove dynamic exception specification"),
source.isValid() ? source.getBegin() : decl->getLocation())
<< (source.isValid() ? source : decl->getSourceRange());
#endif
return true;
}
private:
bool hasThrowsDocumentation(FunctionDecl const * decl) {
if (auto cmt = compiler.getASTContext().getCommentForDecl(
decl, &compiler.getPreprocessor()))
{
for (auto i = cmt->child_begin(); i != cmt->child_end(); ++i) {
if (auto bcc = dyn_cast<comments::BlockCommandComment>(*i)) {
if (compiler.getASTContext().getCommentCommandTraits()
.getCommandInfo(bcc->getCommandID())->IsThrowsCommand)
{
return true;
}
}
}
}
return false;
}
bool anyRedeclHasThrowsDocumentation(FunctionDecl const * decl) {
return std::any_of(
decl->redecls_begin(), decl->redecls_end(),
[this](FunctionDecl * d) { return hasThrowsDocumentation(d); });
// std::bind(
// &DynExcSpec::hasThrowsDocumentation, this,
// std::placeholders::_1));
}
};
loplugin::Plugin::Registration<DynExcSpec> X("dynexcspec", true);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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