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