lib/Frontend/CreateInvocationFromCommandLine.cpp

   1 //===--- CreateInvocationFromCommandLine.cpp - CompilerInvocation from Args ==//
   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 // Construct a compiler invocation object for command line driver arguments
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "clang/Frontend/Utils.h"
  15 #include "clang/Frontend/CompilerInstance.h"
  16 #include "clang/Frontend/DiagnosticOptions.h"
  17 #include "clang/Frontend/FrontendDiagnostic.h"
  18 #include "clang/Driver/Compilation.h"
  19 #include "clang/Driver/Driver.h"
  20 #include "clang/Driver/ArgList.h"
  21 #include "clang/Driver/Options.h"
  22 #include "clang/Driver/Tool.h"
  23 #include "llvm/Support/Host.h"
  24 using namespace clang;
  25
  26 /// createInvocationFromCommandLine - Construct a compiler invocation object for
  27 /// a command line argument vector.
  28 ///
  29 /// \return A CompilerInvocation, or 0 if none was built for the given
  30 /// argument vector.
  31 CompilerInvocation *
  32 clang::createInvocationFromCommandLine(llvm::ArrayRef<const char *> ArgList,
  33                                    llvm::IntrusiveRefCntPtr<Diagnostic> Diags) {
  34   if (!Diags.getPtr()) {
  35     // No diagnostics engine was provided, so create our own diagnostics object
  36     // with the default options.
  37     DiagnosticOptions DiagOpts;
  38     Diags = CompilerInstance::createDiagnostics(DiagOpts, ArgList.size(),
  39                                                 ArgList.begin());
  40   }
  41
  42   llvm::SmallVector<const char *, 16> Args;
  43   Args.push_back("<clang>"); // FIXME: Remove dummy argument.
  44   Args.insert(Args.end(), ArgList.begin(), ArgList.end());
  45
  46   // FIXME: Find a cleaner way to force the driver into restricted modes. We
  47   // also want to force it to use clang.
  48   Args.push_back("-fsyntax-only");
  49
  50   // FIXME: We shouldn't have to pass in the path info.
  51   driver::Driver TheDriver("clang", llvm::sys::getHostTriple(),
  52                            "a.out", false, false, *Diags);
  53
  54   // Don't check that inputs exist, they may have been remapped.
  55   TheDriver.setCheckInputsExist(false);
  56
  57   llvm::OwningPtr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
  58
  59   // Just print the cc1 options if -### was present.
  60   if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
  61     C->PrintJob(llvm::errs(), C->getJobs(), "\n", true);
  62     return 0;
  63   }
  64
  65   // We expect to get back exactly one command job, if we didn't something
  66   // failed.
  67   const driver::JobList &Jobs = C->getJobs();
  68   if (Jobs.size() != 1 || !isa<driver::Command>(Jobs.begin())) {
  69     llvm::SmallString<256> Msg;
  70     llvm::raw_svector_ostream OS(Msg);
  71     C->PrintJob(OS, C->getJobs(), "; ", true);
  72     Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
  73     return 0;
  74   }
  75
  76   const driver::Command *Cmd = cast<driver::Command>(*Jobs.begin());
  77   if (llvm::StringRef(Cmd->getCreator().getName()) != "clang") {
  78     Diags->Report(diag::err_fe_expected_clang_command);
  79     return 0;
  80   }
  81
  82   const driver::ArgStringList &CCArgs = Cmd->getArguments();
  83   CompilerInvocation *CI = new CompilerInvocation();
  84   CompilerInvocation::CreateFromArgs(*CI,
  85                                      const_cast<const char **>(CCArgs.data()),
  86                                      const_cast<const char **>(CCArgs.data()) +
  87                                      CCArgs.size(),
  88                                      *Diags);
  89   return CI;
  90 }