path: root/utils/TableGen/EDEmitter.cpp

//===- EDEmitter.cpp - Generate instruction descriptions for ED -*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend is responsible for emitting a description of each
// instruction in a format that the enhanced disassembler can use to tokenize
// and parse instructions.
//
//===----------------------------------------------------------------------===//

#include "EDEmitter.h"

#include "AsmWriterInst.h"
#include "CodeGenTarget.h"
#include "Record.h"

#include "llvm/MC/EDInstInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"

#include <map>
#include <string>
#include <vector>

using namespace llvm;

///////////////////////////////////////////////////////////
// Support classes for emitting nested C data structures //
///////////////////////////////////////////////////////////

namespace {
  
  class EnumEmitter {
  private:
    std::string Name;
    std::vector<std::string> Entries;
  public:
    EnumEmitter(const char *N) : Name(N) { 
    }
    int addEntry(const char *e) { 
      Entries.push_back(std::string(e));
      return Entries.size() - 1; 
    }
    void emit(raw_ostream &o, unsigned int &i) {
      o.indent(i) << "enum " << Name.c_str() << " {" << "\n";
      i += 2;
      
      unsigned int index = 0;
      unsigned int numEntries = Entries.size();
      for (index = 0; index < numEntries; ++index) {
        o.indent(i) << Entries[index];
        if (index < (numEntries - 1))
          o << ",";
        o << "\n";
      }
      
      i -= 2;
      o.indent(i) << "};" << "\n";
    }
    
    void emitAsFlags(raw_ostream &o, unsigned int &i) {
      o.indent(i) << "enum " << Name.c_str() << " {" << "\n";
      i += 2;
      
      unsigned int index = 0;
      unsigned int numEntries = Entries.size();
      unsigned int flag = 1;
      for (index = 0; index < numEntries; ++index) {
        o.indent(i) << Entries[index] << " = " << format("0x%x", flag);
        if (index < (numEntries - 1))
          o << ",";
        o << "\n";
        flag <<= 1;
      }
      
      i -= 2;
      o.indent(i) << "};" << "\n";
    }
  };

  class StructEmitter {
  private:
    std::string Name;
    typedef std::pair<const char*, const char*> member;
    std::vector< member > Members;
  public:
    StructEmitter(const char *N) : Name(N) {
    }
    void addMember(const char *t, const char *n) {
      member m(t, n);
      Members.push_back(m);
    }
    void emit(raw_ostream &o, unsigned int &i) {
      o.indent(i) << "struct " << Name.c_str() << " {" << "\n";
      i += 2;
      
      unsigned int index = 0;
      unsigned int numMembers = Members.size();
      for (index = 0; index < numMembers; ++index) {
        o.indent(i) << Members[index].first << " ";
        o.indent(i) << Members[index].second << ";" << "\n";
      }
      
      i -= 2;
      o.indent(i) << "};" << "\n";
    }
  };
  
  class ConstantEmitter {
  public:
    virtual ~ConstantEmitter() { }
    virtual void emit(raw_ostream &o, unsigned int &i) = 0;
  };
  
  class LiteralConstantEmitter :