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(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
