external/bsd/llvm/dist/clang/tools/driver/cc1_main.cpp

   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>
  37 using namespace clang;
  38 using namespace llvm::opt;
  39
  40 //===----------------------------------------------------------------------===//
  41 // Main driver
  42 //===----------------------------------------------------------------------===//
  43
  44 static 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
  61 namespace polly {
  62 void initializePollyPasses(llvm::PassRegistry &Registry);
  63 }
  64 #endif
  65
  66 int 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 }