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/*
This file is part of the clazy static checker.
Copyright (C) 2017 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 "PreProcessorVisitor.h"
#include "MacroUtils.h"
#include <clang/Frontend/CompilerInstance.h>
#include <clang/Lex/Preprocessor.h>
#include <clang/Lex/MacroInfo.h>
#include <clang/Basic/IdentifierTable.h>
#include <clang/Basic/SourceLocation.h>
#include <clang/Basic/SourceManager.h>
#include <clang/Lex/PPCallbacks.h>
#include <clang/Lex/Token.h>
#include <llvm/ADT/ArrayRef.h>
#include <stdlib.h>
#include <memory>
using namespace clang;
using namespace std;
PreProcessorVisitor::PreProcessorVisitor(const clang::CompilerInstance &ci)
: clang::PPCallbacks()
, m_ci(ci)
, m_sm(ci.getSourceManager())
{
Preprocessor &pi = m_ci.getPreprocessor();
pi.addPPCallbacks(std::unique_ptr<PPCallbacks>(this));
// This catches -DQT_NO_KEYWORDS passed to compiler. In MacroExpands() we catch when defined via in code
m_isQtNoKeywords = clazy::isPredefined(ci.getPreprocessorOpts(), "QT_NO_KEYWORDS");
}
bool PreProcessorVisitor::isBetweenQtNamespaceMacros(SourceLocation loc)
{
if (loc.isInvalid())
return false;
if (loc.isMacroID())
loc = m_sm.getExpansionLoc(loc);
uint fileId = m_sm.getFileID(loc).getHashValue();
vector<SourceRange> &pairs = m_q_namespace_macro_locations[fileId];
for (SourceRange &pair : pairs) {
if (pair.getBegin().isInvalid() || pair.getEnd().isInvalid()) {
//llvm::errs() << "PreProcessorVisitor::isBetweenQtNamespaceMacros Found invalid location\n";
continue; // shouldn't happen
}
if (m_sm.isBeforeInSLocAddrSpace(pair.getBegin(), loc) &&
m_sm.isBeforeInSLocAddrSpace(loc, pair.getEnd()))
return true;
}
return false;
}
bool PreProcessorVisitor::hasInclude(const std::string &fileName, bool IsAngled) const
{
auto it = std::find_if(m_includeInfo.cbegin(), m_includeInfo.cend(), [&] (const IncludeInfo& info) {
return info.fileName == fileName && info.IsAngled == IsAngled;
});
return (it != m_includeInfo.cend());
}
SourceLocation PreProcessorVisitor::endOfIncludeSection() const
{
if (m_includeInfo.empty())
return {};
return m_includeInfo.back().filenameRange.getEnd();
}
std::string PreProcessorVisitor::getTokenSpelling(const MacroDefinition &def) const
{
if (!def)
return {};
MacroInfo *info = def.getMacroInfo();
if (!info)
return {};
const Preprocessor &pp = m_ci.getPreprocessor();
string result;
for (const auto &tok : info->tokens())
result += pp.getSpelling(tok);
return result;
}
void PreProcessorVisitor::updateQtVersion()
{
if (m_qtMajorVersion == -1 || m_qtPatchVersion == -1 || m_qtMinorVersion == -1) {
m_qtVersion = -1;
} else {
m_qtVersion = m_qtPatchVersion + m_qtMinorVersion * 100 + m_qtMajorVersion * 10000;
}
}
void PreProcessorVisitor::handleQtNamespaceMacro(SourceLocation loc, StringRef name)
{
const bool isBegin = name == "QT_BEGIN_NAMESPACE";
uint fileId = m_sm.getFileID(loc).getHashValue();
vector<SourceRange> &pairs = m_q_namespace_macro_locations[fileId];
if (isBegin) {
pairs.push_back(SourceRange(loc, {}));
} else {
if (pairs.empty()) {
// llvm::errs() << "FOO Received end!!";
} else {
SourceRange &range = pairs[pairs.size() - 1];
if (range.getBegin().isInvalid()) {
// llvm::errs() << "FOO Error received end before a begin\n";
} else {
range.setEnd(loc);
}
}
}
}
static int stringToNumber(const string &str)
{
if (str.empty())
return -1;
return atoi(str.c_str());
}
void PreProcessorVisitor::MacroExpands(const Token &MacroNameTok, const MacroDefinition &def,
SourceRange range, const MacroArgs *)
{
IdentifierInfo *ii = MacroNameTok.getIdentifierInfo();
if (!ii)
return;
if (ii->getName() == "QT_BEGIN_NAMESPACE" || ii->getName() == "QT_END_NAMESPACE") {
handleQtNamespaceMacro(range.getBegin(), ii->getName());
return;
}
if (!m_isQtNoKeywords && ii->getName() == "QT_NO_KEYWORDS") {
m_isQtNoKeywords = true;
return;
}
if (m_qtVersion != -1)
return;
auto name = ii->getName();
if (name == "QT_VERSION_MAJOR") {
m_qtMajorVersion = stringToNumber(getTokenSpelling(def));
updateQtVersion();
}
if (name == "QT_VERSION_MINOR") {
m_qtMinorVersion = stringToNumber(getTokenSpelling(def));
updateQtVersion();
}
if (name == "QT_VERSION_PATCH") {
m_qtPatchVersion = stringToNumber(getTokenSpelling(def));
updateQtVersion();
}
}
void PreProcessorVisitor::InclusionDirective (clang::SourceLocation, const clang::Token &,
clang::StringRef FileName, bool IsAngled, clang::CharSourceRange FilenameRange,
clazy::OptionalFileEntryRef, clang::StringRef, clang::StringRef,
const clang::Module *, clang::SrcMgr::CharacteristicKind)
{
if (m_ci.getPreprocessor().isInPrimaryFile() && !clazy::endsWith(FileName.str(), ".moc")) {
m_includeInfo.push_back(IncludeInfo{FileName, IsAngled, FilenameRange});
}
}
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