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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 <cassert>
#include "plugin.hxx"
namespace {
clang::Expr const * ignoreParenImplicitComma(clang::Expr const * expr) {
for (;;) {
auto const e1 = expr->IgnoreParens()->IgnoreImplicit();
if (e1 != expr) {
expr = e1;
continue;
}
// auto const e1 = dyn_cast<clang::ExprWithCleanups>(expr);
// if (e1 != nullptr) {
// expr = e1->getSubExpr();
// continue;
// }
auto const e2 = dyn_cast<clang::BinaryOperator>(expr);
if (e2 != nullptr && e2->getOpcode() == clang::BO_Comma) {
expr = e2->getRHS();
continue;
}
return expr;
}
}
bool isPlainChar(clang::QualType type) {
return type->isSpecificBuiltinType(clang::BuiltinType::Char_S)
|| type->isSpecificBuiltinType(clang::BuiltinType::Char_U);
}
bool overridesXServiceInfo(clang::CXXMethodDecl const * decl) {
for (auto i = decl->begin_overridden_methods();
i != decl->end_overridden_methods(); ++i)
{
if (((*i)->getParent()->getQualifiedNameAsString()
== "com::sun::star::lang::XServiceInfo")
|| overridesXServiceInfo(*i))
{
return true;
}
}
return false;
}
class GetImplementationName:
public clang::RecursiveASTVisitor<GetImplementationName>,
public loplugin::Plugin
{
public:
explicit GetImplementationName(InstantiationData const & data): Plugin(data)
{}
void run() override;
bool VisitCXXMethodDecl(clang::CXXMethodDecl const * decl);
private:
bool isStringConstant(Expr const * expr, clang::StringRef * string);
bool returnsStringConstant(
FunctionDecl const * decl, clang::StringRef * string);
};
void GetImplementationName::run() {
if (compiler.getLangOpts().CPlusPlus) {
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
}
bool GetImplementationName::VisitCXXMethodDecl(
clang::CXXMethodDecl const * decl)
{
if (ignoreLocation(decl) || !decl->doesThisDeclarationHaveABody()
|| !decl->isVirtual())
{
return true;
}
auto const id = decl->getIdentifier();
if (id == nullptr || id->getName() != "getImplementationName"
|| !overridesXServiceInfo(decl))
{
return true;
}
clang::StringRef str;
if (!returnsStringConstant(decl, &str)) {
report(
clang::DiagnosticsEngine::Warning,
"cannot determine returned string", decl->getLocation())
<< decl->getSourceRange();
return true;
}
report(
clang::DiagnosticsEngine::Warning, "\"%0\" implemented by %1",
decl->getLocation())
<< str << decl->getParent()->getQualifiedNameAsString()
<< decl->getSourceRange();
return true;
}
bool GetImplementationName::isStringConstant(
Expr const * expr, clang::StringRef * string)
{
QualType t = expr->getType();
if (!(t->isConstantArrayType() && t.isConstQualified()
&& isPlainChar(t->getAsArrayTypeUnsafe()->getElementType())))
{
return false;
}
DeclRefExpr const * dre = dyn_cast<DeclRefExpr>(expr);
if (dre != nullptr) {
VarDecl const * var = dyn_cast<VarDecl>(dre->getDecl());
if (var != nullptr) {
Expr const * init = var->getAnyInitializer();
if (init != nullptr) {
expr = ignoreParenImplicitComma(init);
}
}
}
StringLiteral const * lit = dyn_cast<StringLiteral>(expr);
if (lit != nullptr) {
if (!lit->isAscii()) {
return false;
}
*string = lit->getString();
return true;
}
APValue v;
if (!expr->isCXX11ConstantExpr(compiler.getASTContext(), &v)) {
return false;
}
switch (v.getKind()) {
case APValue::LValue:
return false; //TODO
case APValue::Array:
{
if (v.hasArrayFiller()) { //TODO: handle final NUL filler?
return false;
}
unsigned n = v.getArraySize();
assert(n != 0);
for (unsigned i = 0; i != n; ++i) {
APValue e(v.getArrayInitializedElt(i));
if (!e.isInt()) { //TODO: assert?
return false;
}
APSInt iv = e.getInt();
if (iv == 0) {
if (i == n -1) {
continue;
}
return false;
} else if (iv.uge(0x80)) {
return false;
}
//TODO
}
return false;//TODO
}
default:
assert(false); //TODO???
return "BAD11";
}
}
bool GetImplementationName::returnsStringConstant(
FunctionDecl const * decl, clang::StringRef * string)
{
auto s1 = decl->getBody();
if (s1 == nullptr) {
return false;
}
for (;;) {
auto s2 = dyn_cast<clang::CompoundStmt>(s1);
if (s2 == nullptr) {
auto const s3 = dyn_cast<clang::CXXTryStmt>(s1);
if (s3 == nullptr) {
break;
}
s2 = s3->getTryBlock();
}
if (s2->size() != 1) {
break;
}
s1 = s2->body_front();
}
auto const s4 = dyn_cast<clang::ReturnStmt>(s1);
if (s4 == nullptr) {
return false;
}
for (auto e1 = ignoreParenImplicitComma(s4->getRetValue());;) {
auto const e2 = dyn_cast<clang::CallExpr>(e1);
if (e2 != nullptr) {
auto const d = e2->getDirectCallee();
return d != nullptr && returnsStringConstant(d, string);
}
auto const e3 = dyn_cast<clang::CXXFunctionalCastExpr>(e1);
if (e3 != nullptr) {
e1 = ignoreParenImplicitComma(e3->getSubExpr());
continue;
}
auto const e4 = dyn_cast<clang::CXXConstructExpr>(e1);
if (e4 != nullptr) {
if (e4->getNumArgs() < 1) {
return false;
}
e1 = ignoreParenImplicitComma(e4->getArg(0));
continue;
}
return isStringConstant(e1, string);
}
}
loplugin::Plugin::Registration<GetImplementationName> X(
"getimplementationname");
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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