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/Record.h"
26 #include "llvm/TableGen/TableGenAction.h"
33 OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"),
37 DependFilename("d", cl::desc("Dependency filename"), cl::value_desc("filename"),
41 InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
44 IncludeDirs("I", cl::desc("Directory of include files"),
45 cl::value_desc("directory"), cl::Prefix);
50 int TableGenMain(char *argv0, TableGenAction &Action) {
54 // Parse the input file.
55 OwningPtr<MemoryBuffer> File;
56 if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), File)) {
57 errs() << "Could not open input file '" << InputFilename << "': "
58 << ec.message() <<"\n";
61 MemoryBuffer *F = File.take();
63 // Tell SrcMgr about this buffer, which is what TGParser will pick up.
64 SrcMgr.AddNewSourceBuffer(F, SMLoc());
66 // Record the location of the include directory so that the lexer can find
68 SrcMgr.setIncludeDirs(IncludeDirs);
70 TGParser Parser(SrcMgr, Records);
72 if (Parser.ParseFile())
76 tool_output_file Out(OutputFilename.c_str(), Error);
78 errs() << argv0 << ": error opening " << OutputFilename
79 << ":" << Error << "\n";
82 if (!DependFilename.empty()) {
83 if (OutputFilename == "-") {
84 errs() << argv0 << ": the option -d must be used together with -o\n";
87 tool_output_file DepOut(DependFilename.c_str(), Error);
89 errs() << argv0 << ": error opening " << DependFilename
90 << ":" << Error << "\n";
93 DepOut.os() << OutputFilename << ":";
94 const std::vector<std::string> &Dependencies = Parser.getDependencies();
95 for (std::vector<std::string>::const_iterator I = Dependencies.begin(),
96 E = Dependencies.end();
98 DepOut.os() << " " << (*I);
104 if (Action(Out.os(), Records))
111 } catch (const TGError &Error) {
113 } catch (const std::string &Error) {
115 } catch (const char *Error) {
118 errs() << argv0 << ": Unknown unexpected exception occurred.\n";