llvm-project

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//===--- CreateInvocationFromCommandLine.cpp - CompilerInvocation from Args ==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Construct a compiler invocation object for command line driver arguments
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/DiagnosticOptions.h"
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#include "clang/Driver/Action.h"
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#include "clang/Driver/Compilation.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/Options.h"
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#include "clang/Driver/Tool.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Frontend/Utils.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/TargetParser/Host.h"
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using namespace clang;
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using namespace llvm::opt;
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std::unique_ptr<CompilerInvocation>
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clang::createInvocation(ArrayRef<const char *> ArgList,
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                        CreateInvocationOptions Opts) {
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  assert(!ArgList.empty());
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  auto Diags = Opts.Diags
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                   ? std::move(Opts.Diags)
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                   : CompilerInstance::createDiagnostics(new DiagnosticOptions);
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  SmallVector<const char *, 16> Args(ArgList.begin(), ArgList.end());
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  // FIXME: Find a cleaner way to force the driver into restricted modes.
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  Args.insert(
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      llvm::find_if(
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          Args, [](const char *Elem) { return llvm::StringRef(Elem) == "--"; }),
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      "-fsyntax-only");
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  // FIXME: We shouldn't have to pass in the path info.
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  driver::Driver TheDriver(Args[0], llvm::sys::getDefaultTargetTriple(), *Diags,
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                           "clang LLVM compiler", Opts.VFS);
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  // Don't check that inputs exist, they may have been remapped.
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  TheDriver.setCheckInputsExist(false);
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  TheDriver.setProbePrecompiled(Opts.ProbePrecompiled);
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  std::unique_ptr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
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  if (!C)
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    return nullptr;
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  if (C->getArgs().hasArg(driver::options::OPT_fdriver_only))
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    return nullptr;
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  // Just print the cc1 options if -### was present.
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  if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
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    C->getJobs().Print(llvm::errs(), "\n", true);
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    return nullptr;
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  }
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  // We expect to get back exactly one command job, if we didn't something
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  // failed. Offload compilation is an exception as it creates multiple jobs. If
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  // that's the case, we proceed with the first job. If caller needs a
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  // particular job, it should be controlled via options (e.g.
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  // --cuda-{host|device}-only for CUDA) passed to the driver.
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  const driver::JobList &Jobs = C->getJobs();
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  bool OffloadCompilation = false;
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  if (Jobs.size() > 1) {
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    for (auto &A : C->getActions()){
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      // On MacOSX real actions may end up being wrapped in BindArchAction
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      if (isa<driver::BindArchAction>(A))
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        A = *A->input_begin();
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      if (isa<driver::OffloadAction>(A)) {
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        OffloadCompilation = true;
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        break;
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      }
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    }
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  }
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  bool PickFirstOfMany = OffloadCompilation || Opts.RecoverOnError;
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  if (Jobs.size() == 0 || (Jobs.size() > 1 && !PickFirstOfMany)) {
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    SmallString<256> Msg;
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    llvm::raw_svector_ostream OS(Msg);
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    Jobs.Print(OS, "; ", true);
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    Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
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    return nullptr;
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  }
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  auto Cmd = llvm::find_if(Jobs, [](const driver::Command &Cmd) {
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    return StringRef(Cmd.getCreator().getName()) == "clang";
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  });
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  if (Cmd == Jobs.end()) {
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    Diags->Report(diag::err_fe_expected_clang_command);
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    return nullptr;
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  }
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  const ArgStringList &CCArgs = Cmd->getArguments();
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  if (Opts.CC1Args)
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    *Opts.CC1Args = {CCArgs.begin(), CCArgs.end()};
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  auto CI = std::make_unique<CompilerInvocation>();
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  if (!CompilerInvocation::CreateFromArgs(*CI, CCArgs, *Diags, Args[0]) &&
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      !Opts.RecoverOnError)
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    return nullptr;
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  return CI;
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}
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