cc1_main.cpp revision 261991
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/FrontendTool/Utils.h" 25#include "llvm/ADT/Statistic.h" 26#include "llvm/LinkAllPasses.h" 27#include "llvm/Option/ArgList.h" 28#include "llvm/Option/OptTable.h" 29#include "llvm/Support/ErrorHandling.h" 30#include "llvm/Support/ManagedStatic.h" 31#include "llvm/Support/Signals.h" 32#include "llvm/Support/TargetSelect.h" 33#include "llvm/Support/Timer.h" 34#include "llvm/Support/raw_ostream.h" 35#include <cstdio> 36using namespace clang; 37using namespace llvm::opt; 38 39//===----------------------------------------------------------------------===// 40// Main driver 41//===----------------------------------------------------------------------===// 42 43static void LLVMErrorHandler(void *UserData, const std::string &Message, 44 bool GenCrashDiag) { 45 DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData); 46 47 Diags.Report(diag::err_fe_error_backend) << Message; 48 49 // Run the interrupt handlers to make sure any special cleanups get done, in 50 // particular that we remove files registered with RemoveFileOnSignal. 51 llvm::sys::RunInterruptHandlers(); 52 53 // We cannot recover from llvm errors. When reporting a fatal error, exit 54 // with status 70 to generate crash diagnostics. For BSD systems this is 55 // defined as an internal software error. Otherwise, exit with status 1. 56 exit(GenCrashDiag ? 70 : 1); 57} 58 59int cc1_main(const char **ArgBegin, const char **ArgEnd, 60 const char *Argv0, void *MainAddr) { 61 OwningPtr<CompilerInstance> Clang(new CompilerInstance()); 62 IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs()); 63 64 // Initialize targets first, so that --version shows registered targets. 65 llvm::InitializeAllTargets(); 66 llvm::InitializeAllTargetMCs(); 67 llvm::InitializeAllAsmPrinters(); 68 llvm::InitializeAllAsmParsers(); 69 70 // Buffer diagnostics from argument parsing so that we can output them using a 71 // well formed diagnostic object. 72 IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions(); 73 TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer; 74 DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer); 75 bool Success; 76 Success = CompilerInvocation::CreateFromArgs(Clang->getInvocation(), 77 ArgBegin, ArgEnd, Diags); 78 79 // Infer the builtin include path if unspecified. 80 if (Clang->getHeaderSearchOpts().UseBuiltinIncludes && 81 Clang->getHeaderSearchOpts().ResourceDir.empty()) 82 Clang->getHeaderSearchOpts().ResourceDir = 83 CompilerInvocation::GetResourcesPath(Argv0, MainAddr); 84 85 // Create the actual diagnostics engine. 86 Clang->createDiagnostics(); 87 if (!Clang->hasDiagnostics()) 88 return 1; 89 90 // Set an error handler, so that any LLVM backend diagnostics go through our 91 // error handler. 92 llvm::install_fatal_error_handler(LLVMErrorHandler, 93 static_cast<void*>(&Clang->getDiagnostics())); 94 95 DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics()); 96 if (!Success) 97 return 1; 98 99 // Execute the frontend actions. 100 Success = ExecuteCompilerInvocation(Clang.get()); 101 102 // If any timers were active but haven't been destroyed yet, print their 103 // results now. This happens in -disable-free mode. 104 llvm::TimerGroup::printAll(llvm::errs()); 105 106 // Our error handler depends on the Diagnostics object, which we're 107 // potentially about to delete. Uninstall the handler now so that any 108 // later errors use the default handling behavior instead. 109 llvm::remove_fatal_error_handler(); 110 111 // When running with -disable-free, don't do any destruction or shutdown. 112 if (Clang->getFrontendOpts().DisableFree) { 113 if (llvm::AreStatisticsEnabled() || Clang->getFrontendOpts().ShowStats) 114 llvm::PrintStatistics(); 115 Clang.take(); 116 return !Success; 117 } 118 119 // Managed static deconstruction. Useful for making things like 120 // -time-passes usable. 121 llvm::llvm_shutdown(); 122 123 return !Success; 124} 125