1 //===- Main.cpp - Top-Level TableGen implementation -----------------------===// 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 // 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. 15 // 16 //===----------------------------------------------------------------------===// 17 18 #include "llvm/TableGen/Main.h" 19 #include "TGParser.h" 20 #include "llvm/ADT/StringExtras.h" 21 #include "llvm/Support/CommandLine.h" 22 #include "llvm/Support/FileSystem.h" 23 #include "llvm/Support/MemoryBuffer.h" 24 #include "llvm/Support/ToolOutputFile.h" 25 #include "llvm/TableGen/Error.h" 26 #include "llvm/TableGen/Record.h" 27 #include <algorithm> 28 #include <cstdio> 29 #include <system_error> 30 using namespace llvm; 31 32 static cl::opt<std::string> 33 OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"), 34 cl::init("-")); 35 36 static cl::opt<std::string> 37 DependFilename("d", 38 cl::desc("Dependency filename"), 39 cl::value_desc("filename"), 40 cl::init("")); 41 42 static cl::opt<std::string> 43 InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-")); 44 45 static cl::list<std::string> 46 IncludeDirs("I", cl::desc("Directory of include files"), 47 cl::value_desc("directory"), cl::Prefix); 48 49 static int reportError(const char *ProgName, Twine Msg) { 50 errs() << ProgName << ": " << Msg; 51 errs().flush(); 52 return 1; 53 } 54 55 /// Create a dependency file for `-d` option. 56 /// 57 /// This functionality is really only for the benefit of the build system. 58 /// It is similar to GCC's `-M*` family of options. 59 static int createDependencyFile(const TGParser &Parser, const char *argv0) { 60 if (OutputFilename == "-") 61 return reportError(argv0, "the option -d must be used together with -o\n"); 62 63 std::error_code EC; 64 ToolOutputFile DepOut(DependFilename, EC, sys::fs::F_Text); 65 if (EC) 66 return reportError(argv0, "error opening " + DependFilename + ":" + 67 EC.message() + "\n"); 68 DepOut.os() << OutputFilename << ":"; 69 for (const auto &Dep : Parser.getDependencies()) { 70 DepOut.os() << ' ' << Dep.first; 71 } 72 DepOut.os() << "\n"; 73 DepOut.keep(); 74 return 0; 75 } 76 77 int llvm::TableGenMain(char *argv0, TableGenMainFn *MainFn) { 78 RecordKeeper Records; 79 80 // Parse the input file. 81 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr = 82 MemoryBuffer::getFileOrSTDIN(InputFilename); 83 if (std::error_code EC = FileOrErr.getError()) 84 return reportError(argv0, "Could not open input file '" + InputFilename + 85 "': " + EC.message() + "\n"); 86 87 // Tell SrcMgr about this buffer, which is what TGParser will pick up. 88 SrcMgr.AddNewSourceBuffer(std::move(*FileOrErr), SMLoc()); 89 90 // Record the location of the include directory so that the lexer can find 91 // it later. 92 SrcMgr.setIncludeDirs(IncludeDirs); 93 94 TGParser Parser(SrcMgr, Records); 95 96 if (Parser.ParseFile()) 97 return 1; 98 99 std::error_code EC; 100 ToolOutputFile Out(OutputFilename, EC, sys::fs::F_Text); 101 if (EC) 102 return reportError(argv0, "error opening " + OutputFilename + ":" + 103 EC.message() + "\n"); 104 if (!DependFilename.empty()) { 105 if (int Ret = createDependencyFile(Parser, argv0)) 106 return Ret; 107 } 108 109 if (MainFn(Out.os(), Records)) 110 return 1; 111 112 if (ErrorsPrinted > 0) 113 return reportError(argv0, Twine(ErrorsPrinted) + " errors.\n"); 114 115 // Declare success. 116 Out.keep(); 117 return 0; 118 } 119
