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//===- FixItRewriter.cpp - Fix-It Rewriter Diagnostic Client --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This is a diagnostic client adaptor that performs rewrites as
// suggested by code modification hints attached to diagnostics. It
// then forwards any diagnostics to the adapted diagnostic client.
//
//===----------------------------------------------------------------------===//
#include "clang/Rewrite/Frontend/FixItRewriter.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Edit/Commit.h"
#include "clang/Edit/EditsReceiver.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Rewrite/Core/RewriteBuffer.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdio>
#include <memory>
#include <string>
#include <system_error>
#include <utility>
using namespace clang;
FixItRewriter::FixItRewriter(DiagnosticsEngine &Diags, SourceManager &SourceMgr,
const LangOptions &LangOpts,
FixItOptions *FixItOpts)
: Diags(Diags), Editor(SourceMgr, LangOpts), Rewrite(SourceMgr, LangOpts),
FixItOpts(FixItOpts) {
Owner = Diags.takeClient();
Client = Diags.getClient();
Diags.setClient(this, false);
}
FixItRewriter::~FixItRewriter() {
Diags.setClient(Client, Owner.release() != nullptr);
}
bool FixItRewriter::WriteFixedFile(FileID ID, raw_ostream &OS) {
const RewriteBuffer *RewriteBuf = Rewrite.getRewriteBufferFor(ID);
if (!RewriteBuf) return true;
RewriteBuf->write(OS);
OS.flush();
return false;
}
namespace {
class RewritesReceiver : public edit::EditsReceiver {
Rewriter &Rewrite;
public:
RewritesReceiver(Rewriter &Rewrite) : Rewrite(Rewrite) {}
void insert(SourceLocation loc, StringRef text) override {
Rewrite.InsertText(loc, text);
}
void replace(CharSourceRange range, StringRef text) override {
Rewrite.ReplaceText(range.getBegin(), Rewrite.getRangeSize(range), text);
}
};
} // namespace
bool FixItRewriter::WriteFixedFiles(
std::vector<std::pair<std::string, std::string>> *RewrittenFiles) {
if (NumFailures > 0 && !FixItOpts->FixWhatYouCan) {
Diag(FullSourceLoc(), diag::warn_fixit_no_changes);
return true;
}
RewritesReceiver Rec(Rewrite);
Editor.applyRewrites(Rec);
if (FixItOpts->InPlace) {
// Overwriting open files on Windows is tricky, but the rewriter can do it
// for us.
Rewrite.overwriteChangedFiles();
return false;
}
for (iterator I = buffer_begin(), E = buffer_end(); I != E; ++I) {
const FileEntry *Entry = Rewrite.getSourceMgr().getFileEntryForID(I->first);
int fd;
std::string Filename =
FixItOpts->RewriteFilename(std::string(Entry->getName()), fd);
std::error_code EC;
std::unique_ptr<llvm::raw_fd_ostream> OS;
if (fd != -1) {
OS.reset(new llvm::raw_fd_ostream(fd, /*shouldClose=*/true));
} else {
OS.reset(new llvm::raw_fd_ostream(Filename, EC, llvm::sys::fs::OF_None));
}
if (EC) {
Diags.Report(clang::diag::err_fe_unable_to_open_output) << Filename
<< EC.message();
continue;
}
RewriteBuffer &RewriteBuf = I->second;
RewriteBuf.write(*OS);
OS->flush();
if (RewrittenFiles)
RewrittenFiles->push_back(
std::make_pair(std::string(Entry->getName()), Filename));
}
return false;
}
bool FixItRewriter::IncludeInDiagnosticCounts() const {
return Client ? Client->IncludeInDiagnosticCounts() : true;
}
void FixItRewriter::HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
const Diagnostic &Info) {
// Default implementation (Warnings/errors count).
DiagnosticConsumer::HandleDiagnostic(DiagLevel, Info);
if (!FixItOpts->Silent ||
DiagLevel >= DiagnosticsEngine::Error ||
(DiagLevel == DiagnosticsEngine::Note && !PrevDiagSilenced) ||
(DiagLevel > DiagnosticsEngine::Note && Info.getNumFixItHints())) {
Client->HandleDiagnostic(DiagLevel, Info);
PrevDiagSilenced = false;
} else {
PrevDiagSilenced = true;
}
// Skip over any diagnostics that are ignored or notes.
if (DiagLevel <= DiagnosticsEngine::Note)
return;
// Skip over errors if we are only fixing warnings.
if (DiagLevel >= DiagnosticsEngine::Error && FixItOpts->FixOnlyWarnings) {
++NumFailures;
return;
}
// Make sure that we can perform all of the modifications we
// in this diagnostic.
edit::Commit commit(Editor);
for (unsigned Idx = 0, Last = Info.getNumFixItHints();
Idx < Last; ++Idx) {
const FixItHint &Hint = Info.getFixItHint(Idx);
if (Hint.CodeToInsert.empty()) {
if (Hint.InsertFromRange.isValid())
commit.insertFromRange(Hint.RemoveRange.getBegin(),
Hint.InsertFromRange, /*afterToken=*/false,
Hint.BeforePreviousInsertions);
else
commit.remove(Hint.RemoveRange);
} else {
if (Hint.RemoveRange.isTokenRange() ||
Hint.RemoveRange.getBegin() != Hint.RemoveRange.getEnd())
commit.replace(Hint.RemoveRange, Hint.CodeToInsert);
else
commit.insert(Hint.RemoveRange.getBegin(), Hint.CodeToInsert,
/*afterToken=*/false, Hint.BeforePreviousInsertions);
}
}
bool CanRewrite = Info.getNumFixItHints() > 0 && commit.isCommitable();
if (!CanRewrite) {
if (Info.getNumFixItHints() > 0)
Diag(Info.getLocation(), diag::note_fixit_in_macro);
// If this was an error, refuse to perform any rewriting.
if (DiagLevel >= DiagnosticsEngine::Error) {
if (++NumFailures == 1)
Diag(Info.getLocation(), diag::note_fixit_unfixed_error);
}
return;
}
if (!Editor.commit(commit)) {
++NumFailures;
Diag(Info.getLocation(), diag::note_fixit_failed);
return;
}
Diag(Info.getLocation(), diag::note_fixit_applied);
}
/// Emit a diagnostic via the adapted diagnostic client.
void FixItRewriter::Diag(SourceLocation Loc, unsigned DiagID) {
// When producing this diagnostic, we temporarily bypass ourselves,
// clear out any current diagnostic, and let the downstream client
// format the diagnostic.
Diags.setClient(Client, false);
Diags.Clear();
Diags.Report(Loc, DiagID);
Diags.setClient(this, false);
}
FixItOptions::~FixItOptions() = default;
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