cc1_main.cpp revision f59edb96b2d0bfe612b732f19519ab84bb995bd4 
1//===-- cc1_main.cpp - Clang CC1 Compiler Frontend ------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This is the entry point to the clang -cc1 functionality, which implements the
11// core compiler functionality along with a number of additional tools for
12// demonstration and testing purposes.
13//
14//===----------------------------------------------------------------------===//
15
16#include "clang/Driver/Arg.h"
17#include "clang/Driver/ArgList.h"
18#include "clang/Driver/DriverDiagnostic.h"
19#include "clang/Driver/OptTable.h"
20#include "clang/Driver/Options.h"
21#include "clang/Frontend/CompilerInstance.h"
22#include "clang/Frontend/CompilerInvocation.h"
23#include "clang/Frontend/FrontendDiagnostic.h"
24#include "clang/Frontend/TextDiagnosticBuffer.h"
25#include "clang/Frontend/TextDiagnosticPrinter.h"
26#include "clang/FrontendTool/Utils.h"
27#include "llvm/ADT/Statistic.h"
28#include "llvm/LinkAllPasses.h"
29#include "llvm/Support/ErrorHandling.h"
30#include "llvm/Support/ManagedStatic.h"
31#include "llvm/Support/Signals.h"
32#include "llvm/Support/TargetSelect.h"
33#include "llvm/Support/Timer.h"
34#include "llvm/Support/raw_ostream.h"
35#include <cstdio>
36using namespace clang;
37
38//===----------------------------------------------------------------------===//
39// Main driver
40//===----------------------------------------------------------------------===//
41
42static void LLVMErrorHandler(void *UserData, const std::string &Message) {
43  DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
44
45  Diags.Report(diag::err_fe_error_backend) << Message;
46
47  // Run the interrupt handlers to make sure any special cleanups get done, in
48  // particular that we remove files registered with RemoveFileOnSignal.
49  llvm::sys::RunInterruptHandlers();
50
51  // We cannot recover from llvm errors.  When reporting a fatal error, exit
52  // with status 70.  For BSD systems this is defined as an internal software
53  // error.  This notifies the driver to report diagnostics information.
54  exit(70);
55}
56
57int cc1_main(const char **ArgBegin, const char **ArgEnd,
58             const char *Argv0, void *MainAddr) {
59  OwningPtr<CompilerInstance> Clang(new CompilerInstance());
60  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
61
62  // Initialize targets first, so that --version shows registered targets.
63  llvm::InitializeAllTargets();
64  llvm::InitializeAllTargetMCs();
65  llvm::InitializeAllAsmPrinters();
66  llvm::InitializeAllAsmParsers();
67
68  // Buffer diagnostics from argument parsing so that we can output them using a
69  // well formed diagnostic object.
70  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
71  TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
72  DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer);
73  bool Success;
74  Success = CompilerInvocation::CreateFromArgs(Clang->getInvocation(),
75                                               ArgBegin, ArgEnd, Diags);
76
77  // Infer the builtin include path if unspecified.
78  if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
79      Clang->getHeaderSearchOpts().ResourceDir.empty())
80    Clang->getHeaderSearchOpts().ResourceDir =
81      CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
82
83  // Create the actual diagnostics engine.
84  Clang->createDiagnostics(ArgEnd - ArgBegin, const_cast<char**>(ArgBegin));
85  if (!Clang->hasDiagnostics())
86    return 1;
87
88  // Set an error handler, so that any LLVM backend diagnostics go through our
89  // error handler.
90  llvm::install_fatal_error_handler(LLVMErrorHandler,
91                                  static_cast<void*>(&Clang->getDiagnostics()));
92
93  DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
94  if (!Success)
95    return 1;
96
97  // Execute the frontend actions.
98  Success = ExecuteCompilerInvocation(Clang.get());
99
100  // If any timers were active but haven't been destroyed yet, print their
101  // results now.  This happens in -disable-free mode.
102  llvm::TimerGroup::printAll(llvm::errs());
103
104  // Our error handler depends on the Diagnostics object, which we're
105  // potentially about to delete. Uninstall the handler now so that any
106  // later errors use the default handling behavior instead.
107  llvm::remove_fatal_error_handler();
108
109  // When running with -disable-free, don't do any destruction or shutdown.
110  if (Clang->getFrontendOpts().DisableFree) {
111    if (llvm::AreStatisticsEnabled() || Clang->getFrontendOpts().ShowStats)
112      llvm::PrintStatistics();
113    Clang.take();
114    return !Success;
115  }
116
117  // Managed static deconstruction. Useful for making things like
118  // -time-passes usable.
119  llvm::llvm_shutdown();
120
121  return !Success;
122}
123