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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 <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) {
if (decl->hasAttr<OverrideAttr>()) {
return true;
}
auto m = dyn_cast<CXXMethodDecl>(decl);
return m != nullptr
&& m->begin_overridden_methods() != m->end_overridden_methods();
}
bool isDtorOrDealloc(FunctionDecl const * decl) {
if (isa<CXXDestructorDecl>(decl)) {
return true;
}
switch (decl->getOverloadedOperator()) {
case OO_Delete:
case OO_Array_Delete:
return true;
default:
return false;
}
}
class DynExcSpec:
public loplugin::FilteringRewritePlugin<DynExcSpec>
{
public:
explicit DynExcSpec(loplugin::InstantiationData const & data):
FilteringRewritePlugin(data) {}
bool preRun() override {
return compiler.getLangOpts().CPlusPlus;
}
void run() override {
if (preRun()) {
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();
}
if (rewriter != nullptr) {
if (!(decl->isDefined() || decl->isPure())) {
return true;
}
if (auto m = dyn_cast<CXXMethodDecl>(decl)) {
for (auto i = m->begin_overridden_methods();
i != m->end_overridden_methods(); ++i)
{
auto proto2 = (*i)->getType()->getAs<FunctionProtoType>();
assert(proto2 != nullptr);
if (proto2->getExceptionSpecType() == EST_Dynamic) {
return true;
}
}
}
}
bool dtorOrDealloc = isDtorOrDealloc(decl);
auto const source = decl->getExceptionSpecSourceRange();
if (rewriter != nullptr && source.isValid()) {
if (dtorOrDealloc) {
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 != "\\") {
if (s.startswith("//")) {
beg = source.getBegin();
}
break;
}
beg = prev;
}
}
if (removeText(SourceRange(beg, source.getEnd()))) {
return true;
}
}
}
report(
DiagnosticsEngine::Warning,
(dtorOrDealloc
? "replace dynamic exception specification with 'noexcept(false)'"
: "remove dynamic exception specification"),
source.isValid() ? source.getBegin() : decl->getLocation())
<< (source.isValid() ? source : decl->getSourceRange());
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> dynexcspec("dynexcspec");
} // 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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