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//===--- FixItRewriter.cpp - Fix-It Rewriter Diagnostic Client --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/Frontend/FixItRewriter.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
#include "llvm/ADT/OwningPtr.h"
#include <cstdio>
using namespace clang;
FixItRewriter::FixItRewriter(Diagnostic &Diags, SourceManager &SourceMgr,
const LangOptions &LangOpts,
FixItPathRewriter *PathRewriter)
: Diags(Diags),
Rewrite(SourceMgr, LangOpts),
PathRewriter(PathRewriter),
NumFailures(0) {
Client = Diags.getClient();
Diags.setClient(this);
}
FixItRewriter::~FixItRewriter() {
Diags.setClient(Client);
}
bool FixItRewriter::WriteFixedFile(FileID ID, llvm::raw_ostream &OS) {
const RewriteBuffer *RewriteBuf = Rewrite.getRewriteBufferFor(ID);
if (!RewriteBuf) return true;
RewriteBuf->write(OS);
OS.flush();
return false;
}
bool FixItRewriter::WriteFixedFiles() {
if (NumFailures > 0) {
Diag(FullSourceLoc(), diag::warn_fixit_no_changes);
return true;
}
for (iterator I = buffer_begin(), E = buffer_end(); I != E; ++I) {
const FileEntry *Entry = Rewrite.getSourceMgr().getFileEntryForID(I->first);
std::string Filename = Entry->getName();
if (PathRewriter)
Filename = PathRewriter->RewriteFilename(Filename);
std::string Err;
llvm::raw_fd_ostream OS(Filename.c_str(), Err,
llvm::raw_fd_ostream::F_Binary);
if (!Err.empty()) {
Diags.Report(clang::diag::err_fe_unable_to_open_output)
<< Filename << Err;
continue;
}
RewriteBuffer &RewriteBuf = I->second;
RewriteBuf.write(OS);
OS.flush();
}
return false;
}
bool FixItRewriter::IncludeInDiagnosticCounts() const {
return Client ? Client->IncludeInDiagnosticCounts() : true;
}
void FixItRewriter::HandleDiagnostic(Diagnostic::Level DiagLevel,
const DiagnosticInfo &Info) {
Client->HandleDiagnostic(DiagLevel, Info);
// Skip over any diagnostics that are ignored or notes.
if (DiagLevel <= Diagnostic::Note)
return;
// Make sure that we can perform all of the modifications we
// in this diagnostic.
bool CanRewrite = Info.getNumFixItHints() > 0;
for (unsigned Idx = 0, Last = Info.getNumFixItHints();
Idx < Last; ++Idx) {
const FixItHint &Hint = Info.getFixItHint(Idx);
if (Hint.RemoveRange.isValid() &&
Rewrite.getRangeSize(Hint.RemoveRange) == -1) {
CanRewrite = false;
break;
}
if (Hint.InsertionLoc.isValid() &&
!Rewrite.isRewritable(Hint.InsertionLoc)) {
CanRewrite = false;
break;
}
}
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 == Diagnostic::Error || DiagLevel == Diagnostic::Fatal) {
if (++NumFailures == 1)
Diag(Info.getLocation(), diag::note_fixit_unfixed_error);
}
return;
}
bool Failed = false;
for (unsigned Idx = 0, Last = Info.getNumFixItHints();
Idx < Last; ++Idx) {
const FixItHint &Hint = Info.getFixItHint(Idx);
if (!Hint.RemoveRange.isValid()) {
// We're adding code.
if (Rewrite.InsertTextBefore(Hint.InsertionLoc, Hint.CodeToInsert))
Failed = true;
continue;
}
if (Hint.CodeToInsert.empty()) {
// We're removing code.
if (Rewrite.RemoveText(Hint.RemoveRange.getBegin(),
Rewrite.getRangeSize(Hint.RemoveRange)))
Failed = true;
continue;
}
// We're replacing code.
if (Rewrite.ReplaceText(Hint.RemoveRange.getBegin(),
Rewrite.getRangeSize(Hint.RemoveRange),
Hint.CodeToInsert))
Failed = true;
}
if (Failed) {
++NumFailures;
Diag(Info.getLocation(), diag::note_fixit_failed);
return;
}
Diag(Info.getLocation(), diag::note_fixit_applied);
}
/// \brief Emit a diagnostic via the adapted diagnostic client.
void FixItRewriter::Diag(FullSourceLoc 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);
Diags.Clear();
Diags.Report(Loc, DiagID);
Diags.setClient(this);
}
FixItPathRewriter::~FixItPathRewriter() {}
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