clang/lib/Frontend/CreateInvocationFromCommandLine.cpp

   1 //===--- CreateInvocationFromCommandLine.cpp - CompilerInvocation from Args ==//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Construct a compiler invocation object for command line driver arguments
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "clang/Basic/DiagnosticOptions.h"
  14 #include "clang/Driver/Action.h"
  15 #include "clang/Driver/Compilation.h"
  16 #include "clang/Driver/Driver.h"
  17 #include "clang/Driver/Options.h"
  18 #include "clang/Driver/Tool.h"
  19 #include "clang/Frontend/CompilerInstance.h"
  20 #include "clang/Frontend/FrontendDiagnostic.h"
  21 #include "clang/Frontend/Utils.h"
  22 #include "llvm/ADT/STLExtras.h"
  23 #include "llvm/ADT/StringRef.h"
  24 #include "llvm/Option/ArgList.h"
  25 #include "llvm/TargetParser/Host.h"
  26 using namespace clang;
  27 using namespace llvm::opt;
  28
  29 std::unique_ptr<CompilerInvocation>
  30 clang::createInvocation(ArrayRef<const char *> ArgList,
  31                         CreateInvocationOptions Opts) {
  32   assert(!ArgList.empty());
  33   auto Diags = Opts.Diags
  34                    ? std::move(Opts.Diags)
  35                    : CompilerInstance::createDiagnostics(new DiagnosticOptions);
  36
  37   SmallVector<const char *, 16> Args(ArgList);
  38
  39   // FIXME: Find a cleaner way to force the driver into restricted modes.
  40   Args.insert(
  41       llvm::find_if(
  42           Args, [](const char *Elem) { return llvm::StringRef(Elem) == "--"; }),
  43       "-fsyntax-only");
  44
  45   // FIXME: We shouldn't have to pass in the path info.
  46   driver::Driver TheDriver(Args[0], llvm::sys::getDefaultTargetTriple(), *Diags,
  47                            "clang LLVM compiler", Opts.VFS);
  48
  49   // Don't check that inputs exist, they may have been remapped.
  50   TheDriver.setCheckInputsExist(false);
  51   TheDriver.setProbePrecompiled(Opts.ProbePrecompiled);
  52
  53   std::unique_ptr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
  54   if (!C)
  55     return nullptr;
  56
  57   if (C->getArgs().hasArg(driver::options::OPT_fdriver_only))
  58     return nullptr;
  59
  60   // Just print the cc1 options if -### was present.
  61   if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
  62     C->getJobs().Print(llvm::errs(), "\n", true);
  63     return nullptr;
  64   }
  65
  66   // We expect to get back exactly one command job, if we didn't something
  67   // failed. Offload compilation is an exception as it creates multiple jobs. If
  68   // that's the case, we proceed with the first job. If caller needs a
  69   // particular job, it should be controlled via options (e.g.
  70   // --cuda-{host|device}-only for CUDA) passed to the driver.
  71   const driver::JobList &Jobs = C->getJobs();
  72   bool OffloadCompilation = false;
  73   if (Jobs.size() > 1) {
  74     for (auto &A : C->getActions()){
  75       // On MacOSX real actions may end up being wrapped in BindArchAction
  76       if (isa<driver::BindArchAction>(A))
  77         A = *A->input_begin();
  78       if (isa<driver::OffloadAction>(A)) {
  79         OffloadCompilation = true;
  80         break;
  81       }
  82     }
  83   }
  84
  85   bool PickFirstOfMany = OffloadCompilation || Opts.RecoverOnError;
  86   if (Jobs.size() == 0 || (Jobs.size() > 1 && !PickFirstOfMany)) {
  87     SmallString<256> Msg;
  88     llvm::raw_svector_ostream OS(Msg);
  89     Jobs.Print(OS, "; ", true);
  90     Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
  91     return nullptr;
  92   }
  93   auto Cmd = llvm::find_if(Jobs, [](const driver::Command &Cmd) {
  94     return StringRef(Cmd.getCreator().getName()) == "clang";
  95   });
  96   if (Cmd == Jobs.end()) {
  97     Diags->Report(diag::err_fe_expected_clang_command);
  98     return nullptr;
  99   }
 100
 101   const ArgStringList &CCArgs = Cmd->getArguments();
 102   if (Opts.CC1Args)
 103     *Opts.CC1Args = {CCArgs.begin(), CCArgs.end()};
 104   auto CI = std::make_unique<CompilerInvocation>();
 105   if (!CompilerInvocation::CreateFromArgs(*CI, CCArgs, *Diags, Args[0]) &&
 106       !Opts.RecoverOnError)
 107     return nullptr;
 108   return CI;
 109 }