1 //===--- ExecuteCompilerInvocation.cpp ------------------------------------===//
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 // This file holds ExecuteCompilerInvocation(). It is split into its own file to
10 // minimize the impact of pulling in essentially everything else in Flang.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "flang/Frontend/CompilerInstance.h"
15 #include "flang/Frontend/FrontendActions.h"
16 #include "clang/Driver/Options.h"
17 #include "llvm/Option/OptTable.h"
18 #include "llvm/Option/Option.h"
19 #include "llvm/Support/BuryPointer.h"
20 #include "llvm/Support/CommandLine.h"
21 
22 namespace Fortran::frontend {
23 
24 static std::unique_ptr<FrontendAction> CreateFrontendBaseAction(
25     CompilerInstance &ci) {
26 
27   ActionKind ak = ci.frontendOpts().programAction_;
28   switch (ak) {
29   case InputOutputTest:
30     return std::make_unique<InputOutputTestAction>();
31     break;
32   case PrintPreprocessedInput:
33     return std::make_unique<PrintPreprocessedAction>();
34     break;
35   case ParseSyntaxOnly:
36     return std::make_unique<ParseSyntaxOnlyAction>();
37     break;
38   default:
39     break;
40     // TODO:
41     // case RunPreprocessor:
42     // case ParserSyntaxOnly:
43     // case EmitLLVM:
44     // case EmitLLVMOnly:
45     // case EmitCodeGenOnly:
46     // (...)
47   }
48   return 0;
49 }
50 
51 std::unique_ptr<FrontendAction> CreateFrontendAction(CompilerInstance &ci) {
52   // Create the underlying action.
53   std::unique_ptr<FrontendAction> act = CreateFrontendBaseAction(ci);
54   if (!act)
55     return nullptr;
56 
57   return act;
58 }
59 bool ExecuteCompilerInvocation(CompilerInstance *flang) {
60   // Honor -help.
61   if (flang->frontendOpts().showHelp_) {
62     clang::driver::getDriverOptTable().PrintHelp(llvm::outs(),
63         "flang-new -fc1 [options] file...", "LLVM 'Flang' Compiler",
64         /*Include=*/clang::driver::options::FC1Option,
65         /*Exclude=*/llvm::opt::DriverFlag::HelpHidden,
66         /*ShowAllAliases=*/false);
67     return true;
68   }
69 
70   // Honor -version.
71   if (flang->frontendOpts().showVersion_) {
72     llvm::cl::PrintVersionMessage();
73     return true;
74   }
75 
76   // Create and execute the frontend action.
77   std::unique_ptr<FrontendAction> act(CreateFrontendAction(*flang));
78   if (!act)
79     return false;
80 
81   bool success = flang->ExecuteAction(*act);
82   return success;
83 }
84 
85 } // namespace Fortran::frontend
86