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      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>
     36 using namespace clang;
     37 using namespace llvm::opt;
     38 
     39 //===----------------------------------------------------------------------===//
     40 // Main driver
     41 //===----------------------------------------------------------------------===//
     42 
     43 static 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 
     59 int 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