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/*
This file is part of the clazy static checker.
Copyright (C) 2016 Sergio Martins <smartins@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "ContextUtils.h"
#include "clazy_stl.h"
#include "Utils.h"
#include "TypeUtils.h"
#include <clang/AST/ParentMap.h>
#include <clang/Basic/SourceLocation.h>
#include <clang/Basic/SourceManager.h>
#include <clang/AST/DeclCXX.h>
#include <clang/AST/DeclFriend.h>
using namespace clang;
using namespace std;
std::vector<DeclContext *> clazy::contextsForDecl(DeclContext *currentScope)
{
std::vector<DeclContext *> decls;
decls.reserve(20); // jump-start
while (currentScope) {
decls.push_back(currentScope);
currentScope = currentScope->getParent();
}
return decls;
}
static string nameForContext(DeclContext *context)
{
if (auto *ns = dyn_cast<NamespaceDecl>(context)) {
return ns->getNameAsString();
} else if (auto rec = dyn_cast<CXXRecordDecl>(context)) {
return rec->getNameAsString();
} else if (auto *method = dyn_cast<CXXMethodDecl>(context)) {
return method->getNameAsString();
} else if (dyn_cast<TranslationUnitDecl>(context)){
return {};
} else {
llvm::errs() << "Unhandled kind: " << context->getDeclKindName() << "\n";
}
return {};
}
string clazy::getMostNeededQualifiedName(const SourceManager &sourceManager,
CXXMethodDecl *method,
DeclContext *currentScope,
SourceLocation usageLoc, bool honourUsingDirectives)
{
if (!currentScope)
return method->getQualifiedNameAsString();
// All namespaces, classes, inner class qualifications
auto methodContexts = clazy::contextsForDecl(method->getDeclContext());
// Visible scopes in current scope
auto visibleContexts = clazy::contextsForDecl(currentScope);
// Collect using directives
vector<UsingDirectiveDecl*> usings;
if (honourUsingDirectives) {
for (DeclContext *context : visibleContexts) {;
clazy::append(context->using_directives(), usings);
}
}
for (UsingDirectiveDecl *u : usings) {
NamespaceDecl *ns = u->getNominatedNamespace();
if (ns) {
if (sourceManager.isBeforeInSLocAddrSpace(usageLoc, getLocStart(u)))
continue;
visibleContexts.push_back(ns->getOriginalNamespace());
}
}
for (DeclContext *context : visibleContexts) {
if (context != method->getParent()) { // Don't remove the most immediate
auto it = clazy::find_if(methodContexts, [context](DeclContext *c) {
if (c == context)
return true;
auto ns1 = dyn_cast<NamespaceDecl>(c);
auto ns2 = dyn_cast<NamespaceDecl>(context);
return ns1 && ns2 && ns1->getQualifiedNameAsString() == ns2->getQualifiedNameAsString();
});
if (it != methodContexts.end()) {
methodContexts.erase(it, it + 1);
}
}
}
string neededContexts;
for (DeclContext *context : methodContexts) {
neededContexts = nameForContext(context) + "::" + neededContexts;
}
const string result = neededContexts + method->getNameAsString();
return result;
}
bool clazy::canTakeAddressOf(CXXMethodDecl *method, DeclContext *context, bool &isSpecialProtectedCase)
{
isSpecialProtectedCase = false;
if (!method || !method->getParent())
return false;
if (method->getAccess() == clang::AccessSpecifier::AS_public)
return true;
if (!context)
return false;
CXXRecordDecl *contextRecord = nullptr;
do {
contextRecord = dyn_cast<CXXRecordDecl>(context);
context = context->getParent();
} while (contextRecord == nullptr && context);
if (!contextRecord) // If we're not inside a class method we can't take the address of a private/protected method
return false;
CXXRecordDecl *record = method->getParent();
if (record == contextRecord)
return true;
// We're inside a method belonging to a class (contextRecord).
// Is contextRecord a friend of record ? Lets check:
for (auto fr : record->friends()) {
TypeSourceInfo *si = fr->getFriendType();
if (si) {
const Type *t = si->getType().getTypePtrOrNull();
CXXRecordDecl *friendClass = t ? t->getAsCXXRecordDecl() : nullptr;
if (friendClass == contextRecord) {
return true;
}
}
}
// There's still hope, lets see if the context is nested inside the class we're trying to access
// Inner classes can access private members of outter classes.
DeclContext *it = contextRecord;
do {
it = it->getParent();
if (it == record)
return true;
} while (it);
if (method->getAccess() == clang::AccessSpecifier::AS_private)
return false;
if (method->getAccess() != clang::AccessSpecifier::AS_protected) // shouldnt happen, must be protected at this point.
return false;
// For protected there's still hope, since record might be a derived or base class
if (TypeUtils::derivesFrom(record, contextRecord))
return true;
if (TypeUtils::derivesFrom(contextRecord, record)) {
isSpecialProtectedCase = true;
return true;
}
return false;
}
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