//===- Main.cpp - Top-Level TableGen implementation -----------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // TableGen is a tool which can be used to build up a description of something, // then invoke one or more "tablegen backends" to emit information about the // description in some predefined format. In practice, this is used by the LLVM // code generators to automate generation of a code generator through a // high-level description of the target. // //===----------------------------------------------------------------------===// #include "TGParser.h" #include "llvm/Support/CommandLine.h" #include "llvm/Support/FileSystem.h" #include "llvm/Support/MemoryBuffer.h" #include "llvm/Support/ToolOutputFile.h" #include "llvm/TableGen/Error.h" #include "llvm/TableGen/Main.h" #include "llvm/TableGen/Record.h" #include <algorithm> #include <cstdio> #include <system_error> using namespace llvm; namespace { cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"), cl::init("-")); cl::opt<std::string> DependFilename("d", cl::desc("Dependency filename"), cl::value_desc("filename"), cl::init("")); cl::opt<std::string> InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-")); cl::list<std::string> IncludeDirs("I", cl::desc("Directory of include files"), cl::value_desc("directory"), cl::Prefix); } /// \brief Create a dependency file for `-d` option. /// /// This functionality is really only for the benefit of the build system. /// It is similar to GCC's `-M*` family of options. static int createDependencyFile(const TGParser &Parser, const char *argv0) { if (OutputFilename == "-") { errs() << argv0 << ": the option -d must be used together with -o\n"; return 1; } std::error_code EC; tool_output_file DepOut(DependFilename, EC, sys::fs::F_Text); if (EC) { errs() << argv0 << ": error opening " << DependFilename << ":" << EC.message() << "\n"; return 1; } DepOut.os() << OutputFilename << ":"; const TGLexer::DependenciesMapTy &Dependencies = Parser.getDependencies(); for (TGLexer::DependenciesMapTy::const_iterator I = Dependencies.begin(), E = Dependencies.end(); I != E; ++I) { DepOut.os() << " " << I->first; } DepOut.os() << "\n"; DepOut.keep(); return 0; } namespace llvm { int TableGenMain(char *argv0, TableGenMainFn *MainFn) { RecordKeeper Records; // Parse the input file. ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr = MemoryBuffer::getFileOrSTDIN(InputFilename); if (std::error_code EC = FileOrErr.getError()) { errs() << "Could not open input file '" << InputFilename << "': " << EC.message() << "\n"; return 1; } // Tell SrcMgr about this buffer, which is what TGParser will pick up. SrcMgr.AddNewSourceBuffer(std::move(*FileOrErr), SMLoc()); // Record the location of the include directory so that the lexer can find // it later. SrcMgr.setIncludeDirs(IncludeDirs); TGParser Parser(SrcMgr, Records); if (Parser.ParseFile()) return 1; std::error_code EC; tool_output_file Out(OutputFilename, EC, sys::fs::F_Text); if (EC) { errs() << argv0 << ": error opening " << OutputFilename << ":" << EC.message() << "\n"; return 1; } if (!DependFilename.empty()) { if (int Ret = createDependencyFile(Parser, argv0)) return Ret; } if (MainFn(Out.os(), Records)) return 1; if (ErrorsPrinted > 0) { errs() << argv0 << ": " << ErrorsPrinted << " errors.\n"; return 1; } // Declare success. Out.keep(); return 0; } }