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 #include <cstdio>
  19 using namespace llvm;
  20
  21 // runEnums - Print out enum values for all of the instructions.
  22 void InstrEnumEmitter::run(std::ostream &OS) {
  23   EmitSourceFileHeader("Target Instruction Enum Values", OS);
  24   OS << "namespace llvm {\n\n";
  25
  26   CodeGenTarget Target;
  27
  28   // We must emit the PHI opcode first...
  29   std::string Namespace;
  30   for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
  31        E = Target.inst_end(); II != E; ++II) {
  32     if (II->second.Namespace != "TargetInstrInfo") {
  33       Namespace = II->second.Namespace;
  34       break;
  35     }
  36   }
  37
  38   if (Namespace.empty()) {
  39     fprintf(stderr, "No instructions defined!\n");
  40     exit(1);
  41   }
  42
  43   std::vector<const CodeGenInstruction*> NumberedInstructions;
  44   Target.getInstructionsByEnumValue(NumberedInstructions);
  45
  46   OS << "namespace " << Namespace << " {\n";
  47   OS << "  enum {\n";
  48   for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
  49     OS << "    " << NumberedInstructions[i]->TheDef->getName()
  50        << "\t= " << i << ",\n";
  51   }
  52   OS << "    INSTRUCTION_LIST_END = " << NumberedInstructions.size() << "\n";
  53   OS << "  };\n}\n";
  54   OS << "} // End llvm namespace \n";
  55 }