cc1_main.cpp revision 263508 
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 "llvm/Option/Arg.h"
17#include "clang/Driver/DriverDiagnostic.h"
18#include "clang/Driver/Options.h"
19#include "clang/Frontend/CompilerInstance.h"
20#include "clang/Frontend/CompilerInvocation.h"
21#include "clang/Frontend/FrontendDiagnostic.h"
22#include "clang/Frontend/TextDiagnosticBuffer.h"
23#include "clang/Frontend/TextDiagnosticPrinter.h"
24#include "clang/FrontendTool/Utils.h"
25#include "llvm/ADT/Statistic.h"
26#include "llvm/LinkAllPasses.h"
27#include "llvm/Option/ArgList.h"
28#include "llvm/Option/OptTable.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;
37using namespace llvm::opt;
38
39//===----------------------------------------------------------------------===//
40// Main driver
41//===----------------------------------------------------------------------===//
42
43static void LLVMErrorHandler(void *UserData, const std::string &Message,
44                             bool GenCrashDiag) {
45  DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
46
47  Diags.Report(diag::err_fe_error_backend) << Message;
48
49  // Run the interrupt handlers to make sure any special cleanups get done, in
50  // particular that we remove files registered with RemoveFileOnSignal.
51  llvm::sys::RunInterruptHandlers();
52
53  // We cannot recover from llvm errors.  When reporting a fatal error, exit
54  // with status 70 to generate crash diagnostics.  For BSD systems this is
55  // defined as an internal software error.  Otherwise, exit with status 1.
56  exit(GenCrashDiag ? 70 : 1);
57}
58
59int cc1_main(const char **ArgBegin, const char **ArgEnd,
60             const char *Argv0, void *MainAddr) {
61  OwningPtr<CompilerInstance> Clang(new CompilerInstance());
62  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
63
64  // Initialize targets first, so that --version shows registered targets.
65  llvm::InitializeAllTargets();
66  llvm::InitializeAllTargetMCs();
67  llvm::InitializeAllAsmPrinters();
68  llvm::InitializeAllAsmParsers();
69
70  // Buffer diagnostics from argument parsing so that we can output them using a
71  // well formed diagnostic object.
72  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
73  TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
74  DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer);
75  bool Success;
76  Success = CompilerInvocation::CreateFromArgs(Clang->getInvocation(),
77                                               ArgBegin, ArgEnd, Diags);
78
79  // Infer the builtin include path if unspecified.
80  if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
81      Clang->getHeaderSearchOpts().ResourceDir.empty())
82    Clang->getHeaderSearchOpts().ResourceDir =
83      CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
84
85  // Create the actual diagnostics engine.
86  Clang->createDiagnostics();
87  if (!Clang->hasDiagnostics())
88    return 1;
89
90  // Set an error handler, so that any LLVM backend diagnostics go through our
91  // error handler.
92  llvm::install_fatal_error_handler(LLVMErrorHandler,
93                                  static_cast<void*>(&Clang->getDiagnostics()));
94
95  DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
96  if (!Success)
97    return 1;
98
99  // Execute the frontend actions.
100  Success = ExecuteCompilerInvocation(Clang.get());
101
102  // If any timers were active but haven't been destroyed yet, print their
103  // results now.  This happens in -disable-free mode.
104  llvm::TimerGroup::printAll(llvm::errs());
105
106  // Our error handler depends on the Diagnostics object, which we're
107  // potentially about to delete. Uninstall the handler now so that any
108  // later errors use the default handling behavior instead.
109  llvm::remove_fatal_error_handler();
110
111  // When running with -disable-free, don't do any destruction or shutdown.
112  if (Clang->getFrontendOpts().DisableFree) {
113    if (llvm::AreStatisticsEnabled() || Clang->getFrontendOpts().ShowStats)
114      llvm::PrintStatistics();
115    Clang.take();
116    return !Success;
117  }
118
119  // Managed static deconstruction. Useful for making things like
120  // -time-passes usable.
121  llvm::llvm_shutdown();
122
123  return !Success;
124}
125