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/Frontend/Utils.h"
14#include "clang/Basic/DiagnosticOptions.h"
15#include "clang/Driver/Compilation.h"
16#include "clang/Driver/Driver.h"
17#include "clang/Driver/Action.h"
18#include "clang/Driver/Options.h"
19#include "clang/Driver/Tool.h"
20#include "clang/Frontend/CompilerInstance.h"
21#include "clang/Frontend/FrontendDiagnostic.h"
22#include "llvm/Option/ArgList.h"
23#include "llvm/Support/Host.h"
24using namespace clang;
25using namespace llvm::opt;
26
27std::unique_ptr<CompilerInvocation> clang::createInvocationFromCommandLine(
28    ArrayRef<const char *> ArgList, IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
29    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS, bool ShouldRecoverOnErorrs,
30    std::vector<std::string> *CC1Args) {
31  if (!Diags.get()) {
32    // No diagnostics engine was provided, so create our own diagnostics object
33    // with the default options.
34    Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions);
35  }
36
37  SmallVector<const char *, 16> Args(ArgList.begin(), ArgList.end());
38
39  // FIXME: Find a cleaner way to force the driver into restricted modes.
40  Args.push_back("-fsyntax-only");
41
42  // FIXME: We shouldn't have to pass in the path info.
43  driver::Driver TheDriver(Args[0], llvm::sys::getDefaultTargetTriple(),
44                           *Diags, VFS);
45
46  // Don't check that inputs exist, they may have been remapped.
47  TheDriver.setCheckInputsExist(false);
48
49  std::unique_ptr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
50  if (!C)
51    return nullptr;
52
53  // Just print the cc1 options if -### was present.
54  if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
55    C->getJobs().Print(llvm::errs(), "\n", true);
56    return nullptr;
57  }
58
59  // We expect to get back exactly one command job, if we didn't something
60  // failed. Offload compilation is an exception as it creates multiple jobs. If
61  // that's the case, we proceed with the first job. If caller needs a
62  // particular job, it should be controlled via options (e.g.
63  // --cuda-{host|device}-only for CUDA) passed to the driver.
64  const driver::JobList &Jobs = C->getJobs();
65  bool OffloadCompilation = false;
66  if (Jobs.size() > 1) {
67    for (auto &A : C->getActions()){
68      // On MacOSX real actions may end up being wrapped in BindArchAction
69      if (isa<driver::BindArchAction>(A))
70        A = *A->input_begin();
71      if (isa<driver::OffloadAction>(A)) {
72        OffloadCompilation = true;
73        break;
74      }
75    }
76  }
77  if (Jobs.size() == 0 || !isa<driver::Command>(*Jobs.begin()) ||
78      (Jobs.size() > 1 && !OffloadCompilation)) {
79    SmallString<256> Msg;
80    llvm::raw_svector_ostream OS(Msg);
81    Jobs.Print(OS, "; ", true);
82    Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
83    return nullptr;
84  }
85
86  const driver::Command &Cmd = cast<driver::Command>(*Jobs.begin());
87  if (StringRef(Cmd.getCreator().getName()) != "clang") {
88    Diags->Report(diag::err_fe_expected_clang_command);
89    return nullptr;
90  }
91
92  const ArgStringList &CCArgs = Cmd.getArguments();
93  if (CC1Args)
94    *CC1Args = {CCArgs.begin(), CCArgs.end()};
95  auto CI = std::make_unique<CompilerInvocation>();
96  if (!CompilerInvocation::CreateFromArgs(*CI, CCArgs, *Diags) &&
97      !ShouldRecoverOnErorrs)
98    return nullptr;
99  return CI;
100}
101