cc1_main.cpp revision 309124 
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/CodeGen/ObjectFilePCHContainerOperations.h"
18#include "clang/Driver/DriverDiagnostic.h"
19#include "clang/Driver/Options.h"
20#include "clang/Frontend/CompilerInstance.h"
21#include "clang/Frontend/CompilerInvocation.h"
22#include "clang/Frontend/FrontendDiagnostic.h"
23#include "clang/Frontend/TextDiagnosticBuffer.h"
24#include "clang/Frontend/TextDiagnosticPrinter.h"
25#include "clang/Frontend/Utils.h"
26#include "clang/FrontendTool/Utils.h"
27#include "llvm/ADT/Statistic.h"
28#include "llvm/LinkAllPasses.h"
29#include "llvm/Option/ArgList.h"
30#include "llvm/Option/OptTable.h"
31#include "llvm/Support/ErrorHandling.h"
32#include "llvm/Support/ManagedStatic.h"
33#include "llvm/Support/Signals.h"
34#include "llvm/Support/TargetSelect.h"
35#include "llvm/Support/Timer.h"
36#include "llvm/Support/raw_ostream.h"
37#include <cstdio>
38using namespace clang;
39using namespace llvm::opt;
40
41//===----------------------------------------------------------------------===//
42// Main driver
43//===----------------------------------------------------------------------===//
44
45static void LLVMErrorHandler(void *UserData, const std::string &Message,
46                             bool GenCrashDiag) {
47  DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
48
49  Diags.Report(diag::err_fe_error_backend) << Message;
50
51  // Run the interrupt handlers to make sure any special cleanups get done, in
52  // particular that we remove files registered with RemoveFileOnSignal.
53  llvm::sys::RunInterruptHandlers();
54
55  // We cannot recover from llvm errors.  When reporting a fatal error, exit
56  // with status 70 to generate crash diagnostics.  For BSD systems this is
57  // defined as an internal software error.  Otherwise, exit with status 1.
58  exit(GenCrashDiag ? 70 : 1);
59}
60
61#ifdef LINK_POLLY_INTO_TOOLS
62namespace polly {
63void initializePollyPasses(llvm::PassRegistry &Registry);
64}
65#endif
66
67int cc1_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
68  std::unique_ptr<CompilerInstance> Clang(new CompilerInstance());
69  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
70
71  // Register the support for object-file-wrapped Clang modules.
72  auto PCHOps = Clang->getPCHContainerOperations();
73  PCHOps->registerWriter(llvm::make_unique<ObjectFilePCHContainerWriter>());
74  PCHOps->registerReader(llvm::make_unique<ObjectFilePCHContainerReader>());
75
76  // Initialize targets first, so that --version shows registered targets.
77  llvm::InitializeAllTargets();
78  llvm::InitializeAllTargetMCs();
79  llvm::InitializeAllAsmPrinters();
80  llvm::InitializeAllAsmParsers();
81
82#ifdef LINK_POLLY_INTO_TOOLS
83  llvm::PassRegistry &Registry = *llvm::PassRegistry::getPassRegistry();
84  polly::initializePollyPasses(Registry);
85#endif
86
87  // Buffer diagnostics from argument parsing so that we can output them using a
88  // well formed diagnostic object.
89  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
90  TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
91  DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer);
92  bool Success = CompilerInvocation::CreateFromArgs(
93      Clang->getInvocation(), Argv.begin(), Argv.end(), Diags);
94
95  // Infer the builtin include path if unspecified.
96  if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
97      Clang->getHeaderSearchOpts().ResourceDir.empty())
98    Clang->getHeaderSearchOpts().ResourceDir =
99      CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
100
101  // Create the actual diagnostics engine.
102  Clang->createDiagnostics();
103  if (!Clang->hasDiagnostics())
104    return 1;
105
106  // Set an error handler, so that any LLVM backend diagnostics go through our
107  // error handler.
108  llvm::install_fatal_error_handler(LLVMErrorHandler,
109                                  static_cast<void*>(&Clang->getDiagnostics()));
110
111  DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
112  if (!Success)
113    return 1;
114
115  // Execute the frontend actions.
116  Success = ExecuteCompilerInvocation(Clang.get());
117
118  // If any timers were active but haven't been destroyed yet, print their
119  // results now.  This happens in -disable-free mode.
120  llvm::TimerGroup::printAll(llvm::errs());
121
122  // Our error handler depends on the Diagnostics object, which we're
123  // potentially about to delete. Uninstall the handler now so that any
124  // later errors use the default handling behavior instead.
125  llvm::remove_fatal_error_handler();
126
127  // When running with -disable-free, don't do any destruction or shutdown.
128  if (Clang->getFrontendOpts().DisableFree) {
129    BuryPointer(std::move(Clang));
130    return !Success;
131  }
132
133  return !Success;
134}
135