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#include "Core/Transform.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
namespace {
using namespace tooling;
using namespace ast_matchers;
/// \brief Custom FrontendActionFactory to produce FrontendActions that handle
/// overriding source file contents before parsing.
///
/// The nested class FactoryAdaptor overrides BeginSourceFileAction to override
/// source file contents before parsing happens. Both Begin and
/// EndSourceFileAction call corresponding callbacks provided by
/// SourceFileCallbacks.
class ActionFactory : public clang::tooling::FrontendActionFactory {
public:
ActionFactory(MatchFinder &Finder, const FileContentsByPath &Overrides,
SourceFileCallbacks &Callbacks)
: Finder(Finder), Overrides(Overrides), Callbacks(Callbacks) {}
virtual FrontendAction *create() LLVM_OVERRIDE {
return new FactoryAdaptor(Finder, Overrides, Callbacks);
}
private:
class FactoryAdaptor : public ASTFrontendAction {
public:
FactoryAdaptor(MatchFinder &Finder, const FileContentsByPath &Overrides,
SourceFileCallbacks &Callbacks)
: Finder(Finder), Overrides(Overrides), Callbacks(Callbacks) {}
ASTConsumer *CreateASTConsumer(CompilerInstance &, StringRef) {
return Finder.newASTConsumer();
}
virtual bool BeginSourceFileAction(CompilerInstance &CI,
StringRef Filename) LLVM_OVERRIDE {
if (!ASTFrontendAction::BeginSourceFileAction(CI, Filename))
return false;
FileContentsByPath::const_iterator I = Overrides.find(Filename.str());
if (I != Overrides.end())
// If an override exists, use it.
CI.getSourceManager()
.overrideFileContents(CI.getFileManager().getFile(I->first),
llvm::MemoryBuffer::getMemBuffer(I->second));
return Callbacks.handleBeginSource(CI, Filename);
}
virtual void EndSourceFileAction() LLVM_OVERRIDE {
Callbacks.handleEndSource();
return ASTFrontendAction::EndSourceFileAction();
}
private:
MatchFinder &Finder;
const FileContentsByPath &Overrides;
SourceFileCallbacks &Callbacks;
};
MatchFinder &Finder;
const FileContentsByPath &Overrides;
SourceFileCallbacks &Callbacks;
};
} // namespace
RewriterContainer::RewriterContainer(clang::FileManager &Files,
const FileContentsByPath &InputStates)
: DiagOpts(new clang::DiagnosticOptions()),
DiagnosticPrinter(llvm::errs(), DiagOpts.getPtr()),
Diagnostics(llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs>(
new clang::DiagnosticIDs()),
DiagOpts.getPtr(), &DiagnosticPrinter, false),
Sources(Diagnostics, Files), Rewrite(Sources, DefaultLangOptions) {
// Overwrite source manager's file contents with data from InputStates
for (FileContentsByPath::const_iterator I = InputStates.begin(),
E = InputStates.end();
I != E; ++I) {
Sources.overrideFileContents(Files.getFile(I->first),
llvm::MemoryBuffer::getMemBuffer(I->second));
}
}
void collectResults(clang::Rewriter &Rewrite,
const FileContentsByPath &InputStates,
FileContentsByPath &Results) {
// Copy the contents of InputStates to be modified.
Results = InputStates;
for (Rewriter::buffer_iterator I = Rewrite.buffer_begin(),
E = Rewrite.buffer_end();
I != E; ++I) {
const FileEntry *Entry = Rewrite.getSourceMgr().getFileEntryForID(I->first);
assert(Entry != 0 && "Expected a FileEntry");
assert(Entry->getName() != 0 &&
"Unexpected NULL return from FileEntry::getName()");
std::string ResultBuf;
// Get a copy of the rewritten buffer from the Rewriter.
llvm::raw_string_ostream StringStream(ResultBuf);
I->second.write(StringStream);
// Cause results to be written to ResultBuf.
StringStream.str();
// FIXME: Use move semantics to avoid copies of the buffer contents if
// benchmarking shows the copies are expensive, especially for large source
// files.
Results[Entry->getName()] = ResultBuf;
}
}
bool Transform::handleBeginSource(CompilerInstance &CI, StringRef Filename) {
if (!Options().EnableTiming)
return true;
Timings.push_back(std::make_pair(Filename.str(), llvm::TimeRecord()));
Timings.back().second -= llvm::TimeRecord::getCurrentTime(true);
return true;
}
void Transform::handleEndSource() {
if (!Options().EnableTiming)
return;
Timings.back().second += llvm::TimeRecord::getCurrentTime(false);
}
void Transform::addTiming(llvm::StringRef Label, llvm::TimeRecord Duration) {
Timings.push_back(std::make_pair(Label.str(), Duration));
}
FrontendActionFactory *
Transform::createActionFactory(MatchFinder &Finder,
const FileContentsByPath &InputStates) {
return new ActionFactory(Finder, InputStates, *this);
}
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