CreateInvocationFromCommandLine.cpp revision 288943 
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/Basic/DiagnosticOptions.h"
16#include "clang/Driver/Compilation.h"
17#include "clang/Driver/Driver.h"
18#include "clang/Driver/Action.h"
19#include "clang/Driver/Options.h"
20#include "clang/Driver/Tool.h"
21#include "clang/Frontend/CompilerInstance.h"
22#include "clang/Frontend/FrontendDiagnostic.h"
23#include "llvm/Option/ArgList.h"
24#include "llvm/Support/Host.h"
25using namespace clang;
26using namespace llvm::opt;
27
28/// createInvocationFromCommandLine - Construct a compiler invocation object for
29/// a command line argument vector.
30///
31/// \return A CompilerInvocation, or 0 if none was built for the given
32/// argument vector.
33CompilerInvocation *
34clang::createInvocationFromCommandLine(ArrayRef<const char *> ArgList,
35                            IntrusiveRefCntPtr<DiagnosticsEngine> Diags) {
36  if (!Diags.get()) {
37    // No diagnostics engine was provided, so create our own diagnostics object
38    // with the default options.
39    Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions);
40  }
41
42  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.
47  Args.push_back("-fsyntax-only");
48
49  // FIXME: We shouldn't have to pass in the path info.
50  driver::Driver TheDriver("clang", llvm::sys::getDefaultTargetTriple(),
51                           *Diags);
52
53  // Don't check that inputs exist, they may have been remapped.
54  TheDriver.setCheckInputsExist(false);
55
56  std::unique_ptr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
57
58  // Just print the cc1 options if -### was present.
59  if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
60    C->getJobs().Print(llvm::errs(), "\n", true);
61    return nullptr;
62  }
63
64  // We expect to get back exactly one command job, if we didn't something
65  // failed. CUDA compilation is an exception as it creates multiple jobs. If
66  // that's the case, we proceed with the first job. If caller needs particular
67  // CUDA job, it should be controlled via --cuda-{host|device}-only option
68  // passed to the driver.
69  const driver::JobList &Jobs = C->getJobs();
70  bool CudaCompilation = false;
71  if (Jobs.size() > 1) {
72    for (auto &A : C->getActions()){
73      // On MacOSX real actions may end up being wrapped in BindArchAction
74      if (isa<driver::BindArchAction>(A))
75        A = *A->begin();
76      if (isa<driver::CudaDeviceAction>(A)) {
77        CudaCompilation = true;
78        break;
79      }
80    }
81  }
82  if (Jobs.size() == 0 || !isa<driver::Command>(*Jobs.begin()) ||
83      (Jobs.size() > 1 && !CudaCompilation)) {
84    SmallString<256> Msg;
85    llvm::raw_svector_ostream OS(Msg);
86    Jobs.Print(OS, "; ", true);
87    Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
88    return nullptr;
89  }
90
91  const driver::Command &Cmd = cast<driver::Command>(*Jobs.begin());
92  if (StringRef(Cmd.getCreator().getName()) != "clang") {
93    Diags->Report(diag::err_fe_expected_clang_command);
94    return nullptr;
95  }
96
97  const ArgStringList &CCArgs = Cmd.getArguments();
98  std::unique_ptr<CompilerInvocation> CI(new CompilerInvocation());
99  if (!CompilerInvocation::CreateFromArgs(*CI,
100                                     const_cast<const char **>(CCArgs.data()),
101                                     const_cast<const char **>(CCArgs.data()) +
102                                     CCArgs.size(),
103                                     *Diags))
104    return nullptr;
105  return CI.release();
106}
107