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//===-- cc1_main.cpp - Clang CC1 Compiler Frontend ------------------------===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This is the entry point to the clang -cc1 functionality, which implements the
// core compiler functionality along with a number of additional tools for
// demonstration and testing purposes.
#include "clang/Driver/Arg.h"
#include "clang/Driver/ArgList.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/OptTable.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/TextDiagnosticBuffer.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/FrontendTool/Utils.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/LinkAllPasses.h"
#include <cstdio>
using namespace clang;
// Main driver
static void LLVMErrorHandler(void *UserData, const std::string &Message) {
DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
Diags.Report(diag::err_fe_error_backend) << Message;
// We cannot recover from llvm errors.
// FIXME: Define the need for this testing away.
static int cc1_test(DiagnosticsEngine &Diags,
const char **ArgBegin, const char **ArgEnd) {
using namespace clang::driver;
llvm::errs() << "cc1 argv:";
for (const char **i = ArgBegin; i != ArgEnd; ++i)
llvm::errs() << " \"" << *i << '"';
llvm::errs() << "\n";
// Parse the arguments.
OptTable *Opts = createDriverOptTable();
unsigned MissingArgIndex, MissingArgCount;
InputArgList *Args = Opts->ParseArgs(ArgBegin, ArgEnd,
MissingArgIndex, MissingArgCount);
// Check for missing argument error.
if (MissingArgCount)
<< Args->getArgString(MissingArgIndex) << MissingArgCount;
// Dump the parsed arguments.
llvm::errs() << "cc1 parsed options:\n";
for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
it != ie; ++it)
// Create a compiler invocation.
llvm::errs() << "cc1 creating invocation.\n";
CompilerInvocation Invocation;
if (!CompilerInvocation::CreateFromArgs(Invocation, ArgBegin, ArgEnd, Diags))
return 1;
// Convert the invocation back to argument strings.
std::vector<std::string> InvocationArgs;
// Dump the converted arguments.
SmallVector<const char*, 32> Invocation2Args;
llvm::errs() << "invocation argv :";
for (unsigned i = 0, e = InvocationArgs.size(); i != e; ++i) {
llvm::errs() << " \"" << InvocationArgs[i] << '"';
llvm::errs() << "\n";
// Convert those arguments to another invocation, and check that we got the
// same thing.
CompilerInvocation Invocation2;
if (!CompilerInvocation::CreateFromArgs(Invocation2, Invocation2Args.begin(),
Invocation2Args.end(), Diags))
return 1;
// FIXME: Implement CompilerInvocation comparison.
if (true) {
//llvm::errs() << "warning: Invocations differ!\n";
std::vector<std::string> Invocation2Args;
llvm::errs() << "invocation2 argv:";
for (unsigned i = 0, e = Invocation2Args.size(); i != e; ++i)
llvm::errs() << " \"" << Invocation2Args[i] << '"';
llvm::errs() << "\n";
return 0;
int cc1_main(const char **ArgBegin, const char **ArgEnd,
const char *Argv0, void *MainAddr) {
OwningPtr<CompilerInstance> Clang(new CompilerInstance());
IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
// Run clang -cc1 test.
if (ArgBegin != ArgEnd && StringRef(ArgBegin[0]) == "-cc1test") {
DiagnosticsEngine Diags(DiagID, new TextDiagnosticPrinter(llvm::errs(),
return cc1_test(Diags, ArgBegin + 1, ArgEnd);
// Initialize targets first, so that --version shows registered targets.
// Buffer diagnostics from argument parsing so that we can output them using a
// well formed diagnostic object.
TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
DiagnosticsEngine Diags(DiagID, DiagsBuffer);
bool Success;
Success = CompilerInvocation::CreateFromArgs(Clang->getInvocation(),
ArgBegin, ArgEnd, Diags);
// Infer the builtin include path if unspecified.
if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
Clang->getHeaderSearchOpts().ResourceDir =
CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
// Create the actual diagnostics engine.
Clang->createDiagnostics(ArgEnd - ArgBegin, const_cast<char**>(ArgBegin));
if (!Clang->hasDiagnostics())
return 1;
// Set an error handler, so that any LLVM backend diagnostics go through our
// error handler.
if (!Success)
return 1;
// Execute the frontend actions.
Success = ExecuteCompilerInvocation(Clang.get());
// If any timers were active but haven't been destroyed yet, print their
// results now. This happens in -disable-free mode.
// Our error handler depends on the Diagnostics object, which we're
// potentially about to delete. Uninstall the handler now so that any
// later errors use the default handling behavior instead.
// When running with -disable-free, don't do any destruction or shutdown.
if (Clang->getFrontendOpts().DisableFree) {
if (llvm::AreStatisticsEnabled() || Clang->getFrontendOpts().ShowStats)
return !Success;
// Managed static deconstruction. Useful for making things like
// -time-passes usable.
return !Success;