utils/TableGen/InstrEnumEmitter.cpp

   1 //===- InstrEnumEmitter.cpp - Generate Instruction Set Enums --------------===//
   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 // This tablegen backend is responsible for emitting enums for each machine
  11 // instruction.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "InstrEnumEmitter.h"
  16 #include "CodeGenTarget.h"
  17 #include "Record.h"
  18 using namespace llvm;
  19
  20 // runEnums - Print out enum values for all of the instructions.
  21 void InstrEnumEmitter::run(std::ostream &OS) {
  22   EmitSourceFileHeader("Target Instruction Enum Values", OS);
  23   OS << "namespace llvm {\n\n";
  24
  25   CodeGenTarget Target;
  26
  27   // We must emit the PHI opcode first...
  28   std::string Namespace;
  29   for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
  30        E = Target.inst_end(); II != E; ++II) {
  31     if (II->second.Namespace != "TargetInstrInfo") {
  32       Namespace = II->second.Namespace;
  33       break;
  34     }
  35   }
  36
  37   if (Namespace.empty()) {
  38     fprintf(stderr, "No instructions defined!\n");
  39     exit(1);
  40   }
  41
  42   std::vector<const CodeGenInstruction*> NumberedInstructions;
  43   Target.getInstructionsByEnumValue(NumberedInstructions);
  44
  45   OS << "namespace " << Namespace << " {\n";
  46   OS << "  enum {\n";
  47   for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
  48     OS << "    " << NumberedInstructions[i]->TheDef->getName()
  49        << "\t= " << i << ",\n";
  50   }
  51   OS << "    INSTRUCTION_LIST_END = " << NumberedInstructions.size() << "\n";
  52   OS << "  };\n}\n";
  53   OS << "} // End llvm namespace \n";
  54 }