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(const char **ArgBegin, const char **ArgEnd,
67             const char *Argv0, void *MainAddr) {
68  std::unique_ptr<CompilerInstance> Clang(new CompilerInstance());
69  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
70
71  // Initialize targets first, so that --version shows registered targets.
72  llvm::InitializeAllTargets();
73  llvm::InitializeAllTargetMCs();
74  llvm::InitializeAllAsmPrinters();
75  llvm::InitializeAllAsmParsers();
76
77#ifdef LINK_POLLY_INTO_TOOLS
78  llvm::PassRegistry &Registry = *llvm::PassRegistry::getPassRegistry();
79  polly::initializePollyPasses(Registry);
80#endif
81
82  // Buffer diagnostics from argument parsing so that we can output them using a
83  // well formed diagnostic object.
84  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
85  TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
86  DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer);
87  bool Success;
88  Success = CompilerInvocation::CreateFromArgs(Clang->getInvocation(),
89                                               ArgBegin, ArgEnd, Diags);
90
91  // Infer the builtin include path if unspecified.
92  if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
93      Clang->getHeaderSearchOpts().ResourceDir.empty())
94    Clang->getHeaderSearchOpts().ResourceDir =
95      CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
96
97  // Create the actual diagnostics engine.
98  Clang->createDiagnostics();
99  if (!Clang->hasDiagnostics())
100    return 1;
101
102  // Set an error handler, so that any LLVM backend diagnostics go through our
103  // error handler.
104  llvm::install_fatal_error_handler(LLVMErrorHandler,
105                                  static_cast<void*>(&Clang->getDiagnostics()));
106
107  DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
108  if (!Success)
109    return 1;
110
111  // Execute the frontend actions.
112  Success = ExecuteCompilerInvocation(Clang.get());
113
114  // If any timers were active but haven't been destroyed yet, print their
115  // results now.  This happens in -disable-free mode.
116  llvm::TimerGroup::printAll(llvm::errs());
117
118  // Our error handler depends on the Diagnostics object, which we're
119  // potentially about to delete. Uninstall the handler now so that any
120  // later errors use the default handling behavior instead.
121  llvm::remove_fatal_error_handler();
122
123  // When running with -disable-free, don't do any destruction or shutdown.
124  if (Clang->getFrontendOpts().DisableFree) {
125    if (llvm::AreStatisticsEnabled() || Clang->getFrontendOpts().ShowStats)
126      llvm::PrintStatistics();
127    BuryPointer(Clang.release());
128    return !Success;
129  }
130
131  // Managed static deconstruction. Useful for making things like
132  // -time-passes usable.
133  llvm::llvm_shutdown();
134
135  return !Success;
136}
137