CreateInvocationFromCommandLine.cpp revision 239462 
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"
24using 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.
31CompilerInvocation *
32clang::createInvocationFromCommandLine(ArrayRef<const char *> ArgList,
33                            IntrusiveRefCntPtr<DiagnosticsEngine> 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  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                           "a.out", false, *Diags);
52  // Force driver to use clang.
53  // FIXME: This seems like a hack. Maybe the "Clang" tool subclass should be
54  // available for using it to get the arguments, thus avoiding the overkill
55  // of using the driver.
56  TheDriver.setForcedClangUse();
57
58  // Don't check that inputs exist, they may have been remapped.
59  TheDriver.setCheckInputsExist(false);
60
61  OwningPtr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
62
63  // Just print the cc1 options if -### was present.
64  if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
65    C->PrintJob(llvm::errs(), C->getJobs(), "\n", true);
66    return 0;
67  }
68
69  // We expect to get back exactly one command job, if we didn't something
70  // failed.
71  const driver::JobList &Jobs = C->getJobs();
72  if (Jobs.size() != 1 || !isa<driver::Command>(*Jobs.begin())) {
73    SmallString<256> Msg;
74    llvm::raw_svector_ostream OS(Msg);
75    C->PrintJob(OS, C->getJobs(), "; ", true);
76    Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
77    return 0;
78  }
79
80  const driver::Command *Cmd = cast<driver::Command>(*Jobs.begin());
81  if (StringRef(Cmd->getCreator().getName()) != "clang") {
82    Diags->Report(diag::err_fe_expected_clang_command);
83    return 0;
84  }
85
86  const driver::ArgStringList &CCArgs = Cmd->getArguments();
87  OwningPtr<CompilerInvocation> CI(new CompilerInvocation());
88  if (!CompilerInvocation::CreateFromArgs(*CI,
89                                     const_cast<const char **>(CCArgs.data()),
90                                     const_cast<const char **>(CCArgs.data()) +
91                                     CCArgs.size(),
92                                     *Diags))
93    return 0;
94  return CI.take();
95}
96