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 "AsmWriterInst.h"
#include "CodeGenTarget.h"
#include "llvm/MC/EDInstInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <string>
#include <vector>

using namespace llvm;

// TODO: There's a suspiciously large amount of "table" data in this
// backend which should probably be in the TableGen file itself.

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

// TODO: These classes are probably generally useful to other backends;
// add them to TableGen's "helper" API's.

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";
  }
};
} // End anonymous namespace

namespace {
class ConstantEmitter {
public:
  virtual ~ConstantEmitter() { }
  virtual void emit(raw_ostream &o, unsigned int &i) = 0;
};
} // End anonymous namespace

namespace {
class LiteralConstantEmitter : public ConstantEmitter {
private:
  bool IsNumber;
  union {
    int Number;
    const char* String;
  };
public:
  LiteralConstantEmitter(int number = 0) :
    IsNumber(true),
    Number(number) {
  }
  void set(const char *string) {
    IsNumber = false;
    Number = 0;
    String = string;
  }
  bool is(const char *string) {
    return !strcmp(String, string);
  }
  void emit(raw_ostream &o, unsigned int &i) {
    if (IsNumber)
      o << Number;
    else
      o