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