From 30abda16129b16f4e2117e7f121ffefcc9d868e4 Mon Sep 17 00:00:00 2001
From: Daniel Jasper <djasper@google.com>
Date: Wed, 3 Oct 2012 13:28:43 +0000
Subject: [PATCH] As opposed to the clang-fixit tool described on
 http://clang.llvm.org/docs/ClangTools.html, this adds -fixit option to
 clang-check. Thus, clang-check can become a general-purpose tool to run clang
 capitalizing on the info stored in a compilation database.

Review: http://llvm-reviews.chandlerc.com/D51
llvm-svn: 165110
---
 clang/tools/clang-check/CMakeLists.txt |  1 +
 clang/tools/clang-check/ClangCheck.cpp | 74 ++++++++++++++++++++++++++++++++--
 clang/tools/clang-check/Makefile       |  4 +-
 3 files changed, 74 insertions(+), 5 deletions(-)

diff --git a/clang/tools/clang-check/CMakeLists.txt b/clang/tools/clang-check/CMakeLists.txt
index 85e229f..f5d7616 100644
--- a/clang/tools/clang-check/CMakeLists.txt
+++ b/clang/tools/clang-check/CMakeLists.txt
@@ -12,6 +12,7 @@ add_clang_executable(clang-check
 target_link_libraries(clang-check
   clangTooling
   clangBasic
+  clangRewriteFrontend
   )
 
 install(TARGETS clang-check
diff --git a/clang/tools/clang-check/ClangCheck.cpp b/clang/tools/clang-check/ClangCheck.cpp
index daa593a..6c081ac 100644
--- a/clang/tools/clang-check/ClangCheck.cpp
+++ b/clang/tools/clang-check/ClangCheck.cpp
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This file implements a clang-check tool that runs the
-//  clang::SyntaxOnlyAction over a number of translation units.
+//  This file implements a clang-check tool that runs clang based on the info
+//  stored in a compilation database.
 //
 //  This tool uses the Clang Tooling infrastructure, see
 //    http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
@@ -20,9 +20,13 @@
 #include "clang/Driver/OptTable.h"
 #include "clang/Driver/Options.h"
 #include "clang/Frontend/ASTConsumers.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Rewrite/Frontend/FixItRewriter.h"
+#include "clang/Rewrite/Frontend/FrontendActions.h"
 #include "clang/Tooling/CommonOptionsParser.h"
 #include "clang/Tooling/Tooling.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Path.h"
 
 using namespace clang::driver;
 using namespace clang::tooling;
@@ -58,6 +62,68 @@ static cl::opt<std::string> ASTDumpFilter(
     "ast-dump-filter",
     cl::desc(Options->getOptionHelpText(options::OPT_ast_dump_filter)));
 
+static cl::opt<bool> Fixit(
+    "fixit",
+    cl::desc(Options->getOptionHelpText(options::OPT_fixit)));
+static cl::opt<bool> FixWhatYouCan(
+    "fix-what-you-can",
+    cl::desc(Options->getOptionHelpText(options::OPT_fix_what_you_can)));
+
+namespace {
+
+// FIXME: Move FixItRewriteInPlace from lib/Rewrite/Frontend/FrontendActions.cpp
+// into a header file and reuse that.
+class FixItOptions : public clang::FixItOptions {
+public:
+  FixItOptions() {
+    FixWhatYouCan = ::FixWhatYouCan;
+  }
+
+  std::string RewriteFilename(const std::string& filename, int &fd) {
+    assert(llvm::sys::path::is_absolute(filename) &&
+           "clang-fixit expects absolute paths only.");
+
+    // We don't need to do permission checking here since clang will diagnose
+    // any I/O errors itself.
+
+    fd = -1;  // No file descriptor for file.
+
+    return filename;
+  }
+};
+
+/// \brief Subclasses \c clang::FixItRewriter to not count fixed errors/warnings
+/// in the final error counts.
+///
+/// This has the side-effect that clang-check -fixit exits with code 0 on
+/// successfully fixing all errors.
+class FixItRewriter : public clang::FixItRewriter {
+public:
+  FixItRewriter(clang::DiagnosticsEngine& Diags,
+                clang::SourceManager& SourceMgr,
+                const clang::LangOptions& LangOpts,
+                clang::FixItOptions* FixItOpts)
+      : clang::FixItRewriter(Diags, SourceMgr, LangOpts, FixItOpts) {
+  }
+
+  virtual bool IncludeInDiagnosticCounts() const { return false; }
+};
+
+/// \brief Subclasses \c clang::FixItAction so that we can install the custom
+/// \c FixItRewriter.
+class FixItAction : public clang::FixItAction {
+public:
+  virtual bool BeginSourceFileAction(clang::CompilerInstance& CI,
+                                     StringRef Filename) {
+    FixItOpts.reset(new FixItOptions);
+    Rewriter.reset(new FixItRewriter(CI.getDiagnostics(), CI.getSourceManager(),
+                                     CI.getLangOpts(), FixItOpts.get()));
+    return true;
+  }
+};
+
+} // namespace
+
 // Anonymous namespace here causes problems with gcc <= 4.4 on MacOS 10.6.
 // "Non-global symbol: ... can't be a weak_definition"
 namespace clang_check {
@@ -76,9 +142,11 @@ public:
 }
 
 int main(int argc, const char **argv) {
-  clang_check::ClangCheckActionFactory Factory;
   CommonOptionsParser OptionsParser(argc, argv);
   ClangTool Tool(OptionsParser.GetCompilations(),
                  OptionsParser.GetSourcePathList());
+  if (Fixit)
+    return Tool.run(newFrontendActionFactory<FixItAction>());
+  clang_check::ClangCheckActionFactory Factory;
   return Tool.run(newFrontendActionFactory(&Factory));
 }
diff --git a/clang/tools/clang-check/Makefile b/clang/tools/clang-check/Makefile
index 6775c65..4262300 100644
--- a/clang/tools/clang-check/Makefile
+++ b/clang/tools/clang-check/Makefile
@@ -18,7 +18,7 @@ include $(CLANG_LEVEL)/../../Makefile.config
 LINK_COMPONENTS := $(TARGETS_TO_BUILD) asmparser support mc
 USEDLIBS = clangFrontend.a clangSerialization.a clangDriver.a \
            clangTooling.a clangParse.a clangSema.a clangAnalysis.a \
-           clangEdit.a clangAST.a clangLex.a clangBasic.a
+           clangEdit.a clangAST.a clangLex.a clangBasic.a \
+           clangRewriteFrontend.a
 
 include $(CLANG_LEVEL)/Makefile
-
-- 
2.7.4