1 //===- Main.cpp - Top-Level TableGen implementation -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // TableGen is a tool which can be used to build up a description of something,
11 // then invoke one or more "tablegen backends" to emit information about the
12 // description in some predefined format. In practice, this is used by the LLVM
13 // code generators to automate generation of a code generator through a
14 // high-level description of the target.
16 //===----------------------------------------------------------------------===//
19 #include "llvm/ADT/OwningPtr.h"
20 #include "llvm/Support/CommandLine.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include "llvm/Support/ToolOutputFile.h"
23 #include "llvm/Support/system_error.h"
24 #include "llvm/TableGen/Error.h"
25 #include "llvm/TableGen/Main.h"
26 #include "llvm/TableGen/Record.h"
33 OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"),
38 cl::desc("Dependency filename"),
39 cl::value_desc("filename"),
43 InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
46 IncludeDirs("I", cl::desc("Directory of include files"),
47 cl::value_desc("directory"), cl::Prefix);
50 /// \brief Create a dependency file for `-d` option.
52 /// This functionality is really only for the benefit of the build system.
53 /// It is similar to GCC's `-M*` family of options.
54 static int handleDependencies(const TGParser &Parser, const char *argv0) {
55 if (OutputFilename == "-") {
56 errs() << argv0 << ": the option -d must be used together with -o\n";
60 tool_output_file DepOut(DependFilename.c_str(), Error);
62 errs() << argv0 << ": error opening " << DependFilename
63 << ":" << Error << "\n";
66 DepOut.os() << OutputFilename << ":";
67 const std::vector<std::string> &Dependencies = Parser.getDependencies();
68 for (std::vector<std::string>::const_iterator I = Dependencies.begin(),
69 E = Dependencies.end();
71 DepOut.os() << " " << (*I);
80 int TableGenMain(char *argv0, TableGenMainFn *MainFn) {
84 // Parse the input file.
85 OwningPtr<MemoryBuffer> File;
87 MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), File)) {
88 errs() << "Could not open input file '" << InputFilename << "': "
89 << ec.message() <<"\n";
92 MemoryBuffer *F = File.take();
94 // Tell SrcMgr about this buffer, which is what TGParser will pick up.
95 SrcMgr.AddNewSourceBuffer(F, SMLoc());
97 // Record the location of the include directory so that the lexer can find
99 SrcMgr.setIncludeDirs(IncludeDirs);
101 TGParser Parser(SrcMgr, Records);
103 if (Parser.ParseFile())
107 tool_output_file Out(OutputFilename.c_str(), Error);
108 if (!Error.empty()) {
109 errs() << argv0 << ": error opening " << OutputFilename
110 << ":" << Error << "\n";
113 if (!DependFilename.empty())
114 if (int Ret = handleDependencies(Parser, argv0))
117 if (MainFn(Out.os(), Records))
124 } catch (const TGError &Error) {
126 } catch (const std::string &Error) {
128 } catch (const char *Error) {
131 errs() << argv0 << ": Unknown unexpected exception occurred.\n";