/*

 * Copyright (C) 2012 David Anderson

 *

 * This file is part of JITCraft.

 *

 * JITCraft is free software: you can redistribute it and/or modify it under

 * the terms of the GNU General Public License as published by the Free

 * Software Foundation, either version 3 of the License, or (at your option)

 * any later version.

 * 

 * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY

 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * JITCraft. If not, see http://www.gnu.org/licenses/.

 */

#include "Opcodes.h"

#include "Utility.h"

#include "Code.h"

using namespace jc;

OpInfo jc::OpcodeInfo[] =

{

#define OPDEF(name, number, text, length, uses, defs) \

    {text, length, uses, defs},

#include "Opcodes.tbl"

#undef OPDEF

};

// All jumps must be the same length.

STATIC_ASSERT(OP_JL_LENGTH == OP_JUMP_LENGTH);

STATIC_ASSERT(OP_JLE_LENGTH == OP_JUMP_LENGTH);

STATIC_ASSERT(OP_JG_LENGTH == OP_JUMP_LENGTH);

STATIC_ASSERT(OP_JGE_LENGTH == OP_JUMP_LENGTH);

STATIC_ASSERT(OP_JEQ_LENGTH == OP_JUMP_LENGTH);

STATIC_ASSERT(OP_JNE_LENGTH == OP_JUMP_LENGTH);

STATIC_ASSERT(OP_JT_LENGTH == OP_JUMP_LENGTH);

STATIC_ASSERT(OP_JF_LENGTH == OP_JUMP_LENGTH);

void

jc::Disassemble(Code *code, FILE *fp)

{

    bytecode *pc = code->start();

    for (;;) {

        Opcode op = Opcode(*pc);

        fprintf(fp, "%-4d %s ", int(pc - code->start()), OpcodeInfo[op].name);

        switch (op) {

          case OP_NOP:

          case OP_RETURN:

          case OP_ADD:

          case OP_SUB:

          case OP_MUL:

          case OP_DIV:

          case OP_POP:

          case OP_LD_STA_I:

          case OP_LD_STA_P:

          case OP_ST_STA_I:

          case OP_BOUNDS_STA:

            break;

          case OP_STOP:

            fprintf(fp, "\n");

            return;

          case OP_INT:

            fprintf(fp, "%d", READ_INT32(pc));

            break;

          case OP_JL:

          case OP_JLE:

          case OP_JG:

          case OP_JGE:

          case OP_JEQ:

          case OP_JNE:

          case OP_JT:

          case OP_JF:

          case OP_JUMP:

            fprintf(fp, "%d (%u)", READ_INT32(pc), unsigned((pc + READ_INT32(pc)) - code->start()));

            break;

          case OP_STACKARRAY:

          {

            unsigned width = pc[1];

            unsigned dims = pc[2];

            for (unsigned i = 0; i < dims; i++)

                fprintf(fp, "[%u]", READ_UINT32(pc + 2 + (i * sizeof(unsigned))));

            fprintf(fp, " ; (width = %s)\n", (width == 1 ? "char" : "cell"));

            pc += 3 + dims * sizeof(unsigned);

            continue;

          }

          case OP_GETLOCAL:

          case OP_SETLOCAL:

          case OP_GETARG:

          case OP_SETARG:

            fprintf(fp, "%u", READ_UINT32(pc));

            break;

          case OP_CALLGLOBAL:

            fprintf(fp, "%u", READ_UINT32(pc));

            break;

          default:

            // Unknown opcode!

            assert(false);

            return;

        }

        fprintf(fp, "\n");

        pc += OpcodeInfo[op].length;

    }

}