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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 <algorithm>
#include <cassert>
#include <limits>
#include <string>
#include "plugin.hxx"
namespace {
bool isStdException(QualType type) {
//TODO:
std::string name { type.getAsString() };
return name == "std::exception" || name == "::std::exception";
}
class StdException:
public loplugin::FilteringRewritePlugin<StdException>
{
public:
explicit StdException(InstantiationData const & data): FilteringRewritePlugin(data)
{}
virtual void run() override
{ TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool VisitCXXMethodDecl(CXXMethodDecl const * decl);
};
bool StdException::VisitCXXMethodDecl(CXXMethodDecl const * decl) {
if (ignoreLocation(decl)
|| decl->begin_overridden_methods() == decl->end_overridden_methods())
{
return true;
}
CXXMethodDecl const * over = nullptr;
for (auto i = decl->begin_overridden_methods();
i != decl->end_overridden_methods(); ++i)
{
FunctionProtoType const * t
= (*i)->getType()->getAs<FunctionProtoType>();
switch (t->getExceptionSpecType()) {
case EST_None:
continue;
case EST_DynamicNone:
case EST_BasicNoexcept:
return true;
case EST_Dynamic:
{
unsigned n = t->getNumExceptions();
for (unsigned j = 0; j != n; ++j) {
if (isStdException(t->getExceptionType(j))) {
over = *i;
goto found;
}
}
return true;
}
case EST_ComputedNoexcept:
switch (t->getNoexceptSpec(compiler.getASTContext())) {
case FunctionProtoType::NR_NoNoexcept:
case FunctionProtoType::NR_BadNoexcept:
assert(false);
// fall through
case FunctionProtoType::NR_Dependent:
break;
case FunctionProtoType::NR_Throw:
continue;
case FunctionProtoType::NR_Nothrow:
return true;
}
case EST_MSAny:
case EST_Unevaluated:
case EST_Uninstantiated:
continue; //TODO???
}
}
return true;
found:
FunctionProtoType const * t = decl->getType()->getAs<FunctionProtoType>();
if (!t->hasDynamicExceptionSpec()) {
report(
DiagnosticsEngine::Warning,
"override does not have dynamic exception specification",
decl->getLocStart())
<< decl->getSourceRange();
report(
DiagnosticsEngine::Note,
("overridden declaration with dynamic exception specification"
" including std::exception is here"),
over->getLocStart());
return true;
}
unsigned n = t->getNumExceptions();
for (unsigned i = 0; i != n; ++i) {
if (isStdException(t->getExceptionType(i))) {
return true;
}
}
SourceRange r { decl->getSourceRange() };
SourceLocation l {
compiler.getSourceManager().getExpansionLoc(r.getBegin()) };
SourceLocation end {
compiler.getSourceManager().getExpansionLoc(r.getEnd()) };
assert(
l == end
|| compiler.getSourceManager().isBeforeInTranslationUnit(l, end));
bool seenThrow = false;
unsigned parens = 0;
SourceLocation openParen;
SourceLocation loc;
for (;;) {
unsigned n = Lexer::MeasureTokenLength(
l, compiler.getSourceManager(), compiler.getLangOpts());
std::string s { compiler.getSourceManager().getCharacterData(l), n };
if (s == "{" || s == ";") {
break;
}
if (!seenThrow) {
if (s == "throw") {
seenThrow = true;
}
} else if (s == "(") {
assert(parens < std::numeric_limits<unsigned>::max());
++parens;
if (parens == 1) {
openParen = l;
}
loc = l;
} else if (s == ")") {
assert(parens != 0);
--parens;
if (parens == 0) {
assert(loc.isValid());
// Only rewrite declarations in include files if a definition is
// also seen, to avoid compilation of a definition (in a main
// file only processed later) to fail with a "mismatch" error
// before the rewriter had a chance to act upon the definition
// (but use the heuristic of assuming pure virtual functions do
// not have definitions):
if (rewriter != nullptr
&& (compiler.getSourceManager().isInMainFile(
compiler.getSourceManager().getSpellingLoc(loc))
|| decl->isDefined() || decl->isPure())
&& insertTextAfterToken(
loc,
(loc == openParen
? "std::exception" : ", std::exception")))
{
return true;
}
break;
}
loc = l;
} else if (!s.empty() && s.compare(0, 2, "/*") != 0
&& s.compare(0, 2, "//") != 0)
{
loc = l;
}
if (l == end) {
break;
}
l = l.getLocWithOffset(std::max<unsigned>(n, 1));
}
report(
DiagnosticsEngine::Warning,
"override dropped std::exception from dynamic exception specification",
openParen.isValid() ? openParen : decl->getLocStart())
<< decl->getSourceRange();
report(
DiagnosticsEngine::Note, "overridden declaration is here",
over->getLocStart());
return true;
}
loplugin::Plugin::Registration<StdException> X("stdexception", true);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
