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/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"
24 using namespace clang;
25 using namespace llvm::opt;
26
27 /// createInvocationFromCommandLine - Construct a compiler invocation object for
28 /// a command line argument vector.
29 ///
30 /// \return A CompilerInvocation, or 0 if none was built for the given
31 /// argument vector.
32 CompilerInvocation *
createInvocationFromCommandLine(ArrayRef<const char * > ArgList,IntrusiveRefCntPtr<DiagnosticsEngine> Diags)33 clang::createInvocationFromCommandLine(ArrayRef<const char *> ArgList,
34 IntrusiveRefCntPtr<DiagnosticsEngine> Diags) {
35 if (!Diags.get()) {
36 // No diagnostics engine was provided, so create our own diagnostics object
37 // with the default options.
38 Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions);
39 }
40
41 SmallVector<const char *, 16> Args;
42 Args.push_back("<clang>"); // FIXME: Remove dummy argument.
43 Args.insert(Args.end(), ArgList.begin(), ArgList.end());
44
45 // FIXME: Find a cleaner way to force the driver into restricted modes.
46 Args.push_back("-fsyntax-only");
47
48 // FIXME: We shouldn't have to pass in the path info.
49 driver::Driver TheDriver("clang", llvm::sys::getDefaultTargetTriple(),
50 *Diags);
51
52 // Don't check that inputs exist, they may have been remapped.
53 TheDriver.setCheckInputsExist(false);
54
55 std::unique_ptr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
56
57 // Just print the cc1 options if -### was present.
58 if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
59 C->getJobs().Print(llvm::errs(), "\n", true);
60 return nullptr;
61 }
62
63 // We expect to get back exactly one command job, if we didn't something
64 // failed.
65 const driver::JobList &Jobs = C->getJobs();
66 if (Jobs.size() != 1 || !isa<driver::Command>(*Jobs.begin())) {
67 SmallString<256> Msg;
68 llvm::raw_svector_ostream OS(Msg);
69 Jobs.Print(OS, "; ", true);
70 Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
71 return nullptr;
72 }
73
74 const driver::Command &Cmd = cast<driver::Command>(*Jobs.begin());
75 if (StringRef(Cmd.getCreator().getName()) != "clang") {
76 Diags->Report(diag::err_fe_expected_clang_command);
77 return nullptr;
78 }
79
80 const ArgStringList &CCArgs = Cmd.getArguments();
81 std::unique_ptr<CompilerInvocation> CI(new CompilerInvocation());
82 if (!CompilerInvocation::CreateFromArgs(*CI,
83 const_cast<const char **>(CCArgs.data()),
84 const_cast<const char **>(CCArgs.data()) +
85 CCArgs.size(),
86 *Diags))
87 return nullptr;
88 return CI.release();
89 }
90