utils/TableGen/TableGen.cpp

   1 //===- TableGen.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 "Record.h"
  19 #include "TGParser.h"
  20 #include "llvm/Support/CommandLine.h"
  21 #include "llvm/Support/Streams.h"
  22 #include "llvm/System/Signals.h"
  23 #include "llvm/Support/FileUtilities.h"
  24 #include "llvm/Support/MemoryBuffer.h"
  25 #include "CallingConvEmitter.h"
  26 #include "CodeEmitterGen.h"
  27 #include "RegisterInfoEmitter.h"
  28 #include "InstrInfoEmitter.h"
  29 #include "InstrEnumEmitter.h"
  30 #include "AsmWriterEmitter.h"
  31 #include "DAGISelEmitter.h"
  32 #include "SubtargetEmitter.h"
  33 #include "IntrinsicEmitter.h"
  34 #include <algorithm>
  35 #include <cstdio>
  36 #include <fstream>
  37 #include <ios>
  38 using namespace llvm;
  39
  40 enum ActionType {
  41   PrintRecords,
  42   GenEmitter,
  43   GenRegisterEnums, GenRegister, GenRegisterHeader,
  44   GenInstrEnums, GenInstrs, GenAsmWriter,
  45   GenCallingConv,
  46   GenDAGISel,
  47   GenSubtarget,
  48   GenIntrinsic,
  49   PrintEnums
  50 };
  51
  52 namespace {
  53   cl::opt<ActionType>
  54   Action(cl::desc("Action to perform:"),
  55          cl::values(clEnumValN(PrintRecords, "print-records",
  56                                "Print all records to stdout (default)"),
  57                     clEnumValN(GenEmitter, "gen-emitter",
  58                                "Generate machine code emitter"),
  59                     clEnumValN(GenRegisterEnums, "gen-register-enums",
  60                                "Generate enum values for registers"),
  61                     clEnumValN(GenRegister, "gen-register-desc",
  62                                "Generate a register info description"),
  63                     clEnumValN(GenRegisterHeader, "gen-register-desc-header",
  64                                "Generate a register info description header"),
  65                     clEnumValN(GenInstrEnums, "gen-instr-enums",
  66                                "Generate enum values for instructions"),
  67                     clEnumValN(GenInstrs, "gen-instr-desc",
  68                                "Generate instruction descriptions"),
  69                     clEnumValN(GenCallingConv, "gen-callingconv",
  70                                "Generate calling convention descriptions"),
  71                     clEnumValN(GenAsmWriter, "gen-asm-writer",
  72                                "Generate assembly writer"),
  73                     clEnumValN(GenDAGISel, "gen-dag-isel",
  74                                "Generate a DAG instruction selector"),
  75                     clEnumValN(GenSubtarget, "gen-subtarget",
  76                                "Generate subtarget enumerations"),
  77                     clEnumValN(GenIntrinsic, "gen-intrinsic",
  78                                "Generate intrinsic information"),
  79                     clEnumValN(PrintEnums, "print-enums",
  80                                "Print enum values for a class"),
  81                     clEnumValEnd));
  82
  83   cl::opt<std::string>
  84   Class("class", cl::desc("Print Enum list for this class"),
  85         cl::value_desc("class name"));
  86
  87   cl::opt<std::string>
  88   OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"),
  89                  cl::init("-"));
  90
  91   cl::opt<std::string>
  92   InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
  93
  94   cl::list<std::string>
  95   IncludeDirs("I", cl::desc("Directory of include files"),
  96               cl::value_desc("directory"), cl::Prefix);
  97 }
  98
  99 RecordKeeper llvm::Records;
 100
 101 /// ParseFile - this function begins the parsing of the specified tablegen
 102 /// file.
 103 static bool ParseFile(const std::string &Filename,
 104                       const std::vector<std::string> &IncludeDirs) {
 105   std::string ErrorStr;
 106   MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(&Filename[0], Filename.size(),
 107                                                  &ErrorStr);
 108   if (F == 0) {
 109     cerr << "Could not open input file '" + Filename + "': " << ErrorStr <<"\n";
 110     return true;
 111   }
 112
 113   TGParser Parser(F);
 114
 115   // Record the location of the include directory so that the lexer can find
 116   // it later.
 117   Parser.setIncludeDirs(IncludeDirs);
 118
 119   return Parser.ParseFile();
 120 }
 121
 122 int main(int argc, char **argv) {
 123   cl::ParseCommandLineOptions(argc, argv);
 124
 125   // Parse the input file.
 126   if (ParseFile(InputFilename, IncludeDirs))
 127     return 1;
 128
 129   std::ostream *Out = cout.stream();
 130   if (OutputFilename != "-") {
 131     Out = new std::ofstream(OutputFilename.c_str());
 132
 133     if (!Out->good()) {
 134       cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
 135       return 1;
 136     }
 137
 138     // Make sure the file gets removed if *gasp* tablegen crashes...
 139     sys::RemoveFileOnSignal(sys::Path(OutputFilename));
 140   }
 141
 142   try {
 143     switch (Action) {
 144     case PrintRecords:
 145       *Out << Records;           // No argument, dump all contents
 146       break;
 147     case GenEmitter:
 148       CodeEmitterGen(Records).run(*Out);
 149       break;
 150
 151     case GenRegisterEnums:
 152       RegisterInfoEmitter(Records).runEnums(*Out);
 153       break;
 154     case GenRegister:
 155       RegisterInfoEmitter(Records).run(*Out);
 156       break;
 157     case GenRegisterHeader:
 158       RegisterInfoEmitter(Records).runHeader(*Out);
 159       break;
 160
 161     case GenInstrEnums:
 162       InstrEnumEmitter(Records).run(*Out);
 163       break;
 164     case GenInstrs:
 165       InstrInfoEmitter(Records).run(*Out);
 166       break;
 167     case GenCallingConv:
 168       CallingConvEmitter(Records).run(*Out);
 169       break;
 170     case GenAsmWriter:
 171       AsmWriterEmitter(Records).run(*Out);
 172       break;
 173
 174     case GenDAGISel:
 175       DAGISelEmitter(Records).run(*Out);
 176       break;
 177     case GenSubtarget:
 178       SubtargetEmitter(Records).run(*Out);
 179       break;
 180     case GenIntrinsic:
 181       IntrinsicEmitter(Records).run(*Out);
 182       break;
 183     case PrintEnums:
 184     {
 185       std::vector<Record*> Recs = Records.getAllDerivedDefinitions(Class);
 186       for (unsigned i = 0, e = Recs.size(); i != e; ++i)
 187         *Out << Recs[i]->getName() << ", ";
 188       *Out << "\n";
 189       break;
 190     }
 191     default:
 192       assert(1 && "Invalid Action");
 193       return 1;
 194     }
 195   } catch (const std::string &Error) {
 196     cerr << argv[0] << ": " << Error << "\n";
 197     if (Out != cout.stream()) {
 198       delete Out;                             // Close the file
 199       std::remove(OutputFilename.c_str());    // Remove the file, it's broken
 200     }
 201     return 1;
 202   } catch (...) {
 203     cerr << argv[0] << ": Unknown unexpected exception occurred.\n";
 204     if (Out != cout.stream()) {
 205       delete Out;                             // Close the file
 206       std::remove(OutputFilename.c_str());    // Remove the file, it's broken
 207     }
 208     return 2;
 209   }
 210
 211   if (Out != cout.stream()) {
 212     delete Out;                               // Close the file
 213   }
 214   return 0;
 215 }