src->vm, Makefile is now a bit more abstracted and pretty colours

Changed folder names for sake of clarity (will be introducing a new
build target soon), and Makefile can now easily support more targets.

1 files changed, 0 insertions, 777 deletions

diff --git a/src/runtime.c b/src/runtime.c
deleted file mode 100644
index ccda9d0..0000000
--- a/src/runtime.c
+++ /dev/null
@@ -1,777 +0,0 @@
-/* Copyright (C) 2023 Aryadev Chavali
-
- * You may distribute and modify this code under the terms of the
- * GPLv2 license.  You should have received a copy of the GPLv2
- * license with this file.  If not, please write to:
- * aryadev@aryadevchavali.com.
-
- * Created: 2023-10-15
- * Author: Aryadev Chavali
- * Description: Virtual machine implementation
- */
-
-#include <assert.h>
-#include <inttypes.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "./runtime.h"
-
-const char *err_as_cstr(err_t err)
-{
-  switch (err)
-  {
-  case ERR_OK:
-    return "OK";
-    break;
-  case ERR_STACK_UNDERFLOW:
-    return "STACK_UNDERFLOW";
-    break;
-  case ERR_STACK_OVERFLOW:
-    return "STACK_OVERFLOW";
-    break;
-  case ERR_INVALID_OPCODE:
-    return "INVALID_OPCODE";
-    break;
-  case ERR_INVALID_REGISTER_BYTE:
-    return "INVALID_REGISTER_BYTE";
-    break;
-  case ERR_INVALID_REGISTER_HWORD:
-    return "INVALID_REGISTER_HWORD";
-    break;
-  case ERR_INVALID_REGISTER_WORD:
-    return "INVALID_REGISTER_WORD";
-    break;
-  case ERR_INVALID_PROGRAM_ADDRESS:
-    return "INVALID_PROGRAM_ADDRESS";
-  case ERR_END_OF_PROGRAM:
-    return "END_OF_PROGRAM";
-    break;
-  default:
-    return "";
-  }
-}
-
-err_t vm_execute(vm_t *vm)
-{
-  static_assert(NUMBER_OF_OPCODES == 46, "vm_execute: Out of date");
-  struct Program *prog = &vm->program;
-  if (prog->ptr >= prog->max)
-    return ERR_END_OF_PROGRAM;
-  inst_t instruction = prog->instructions[prog->ptr];
-
-  if (OPCODE_IS_TYPE(instruction.opcode, OP_PUSH))
-  {
-    prog->ptr++;
-    return PUSH_ROUTINES[instruction.opcode](vm, instruction.operand);
-  }
-  else if (OPCODE_IS_TYPE(instruction.opcode, OP_MOV) ||
-           OPCODE_IS_TYPE(instruction.opcode, OP_PUSH_REGISTER))
-  {
-    prog->ptr++;
-    return REG_ROUTINES[instruction.opcode](vm, instruction.operand.as_byte);
-  }
-  else if (OPCODE_IS_TYPE(instruction.opcode, OP_POP))
-  {
-    // NOTE: We use the first register to hold the result of this pop
-    data_type_t type = OPCODE_DATA_TYPE(instruction.opcode, OP_POP);
-    prog->ptr++;
-    switch (type)
-    {
-    case DATA_TYPE_NIL:
-      break;
-    case DATA_TYPE_BYTE:
-      return vm_mov_byte(vm, 0);
-      break;
-    case DATA_TYPE_HWORD:
-      return vm_mov_hword(vm, 0);
-      break;
-    case DATA_TYPE_WORD:
-      return vm_mov_word(vm, 0);
-      break;
-    }
-    return ERR_OK;
-  }
-  else if (OPCODE_IS_TYPE(instruction.opcode, OP_DUP))
-  {
-    prog->ptr++;
-    return DUP_ROUTINES[instruction.opcode](vm, instruction.operand.as_word);
-  }
-  else if (OPCODE_IS_TYPE(instruction.opcode, OP_NOT) ||
-           OPCODE_IS_TYPE(instruction.opcode, OP_OR) ||
-           OPCODE_IS_TYPE(instruction.opcode, OP_AND) ||
-           OPCODE_IS_TYPE(instruction.opcode, OP_XOR) ||
-           OPCODE_IS_TYPE(instruction.opcode, OP_EQ) ||
-           OPCODE_IS_TYPE(instruction.opcode, OP_PLUS))
-  {
-    prog->ptr++;
-    return STACK_ROUTINES[instruction.opcode](vm);
-  }
-  else if (instruction.opcode == OP_JUMP_ABS)
-    return vm_jump(vm, instruction.operand.as_word);
-  else if (instruction.opcode == OP_JUMP_STACK)
-  {
-    // Set prog->ptr to the word on top of the stack
-    data_t ret = {0};
-    err_t err  = vm_pop_word(vm, &ret);
-    if (err)
-      return err;
-    return vm_jump(vm, ret.as_word);
-  }
-  else if (instruction.opcode == OP_JUMP_REGISTER)
-  {
-    if (instruction.operand.as_byte >= 8)
-      return ERR_INVALID_REGISTER_WORD;
-    word addr = vm->registers.reg[instruction.operand.as_byte];
-    return vm_jump(vm, addr);
-  }
-  else if (OPCODE_IS_TYPE(instruction.opcode, OP_JUMP_IF))
-  {
-    data_t datum = {0};
-    err_t err    = ERR_OK;
-    if (instruction.opcode == OP_JUMP_IF_BYTE)
-      err = vm_pop_byte(vm, &datum);
-    else if (instruction.opcode == OP_JUMP_IF_HWORD)
-      err = vm_pop_hword(vm, &datum);
-    else if (instruction.opcode == OP_JUMP_IF_WORD)
-      err = vm_pop_word(vm, &datum);
-
-    if (err)
-      return err;
-
-    // If datum != 0 then jump, else go to the next instruction
-    if (datum.as_word != 0)
-      return vm_jump(vm, instruction.operand.as_word);
-    else
-      ++prog->ptr;
-  }
-  else if (instruction.opcode >= OP_PRINT_CHAR &&
-           instruction.opcode <= OP_PRINT_WORD)
-  {
-    data_t datum = {0};
-    enum
-    {
-      TYPE_CHAR,
-      TYPE_BYTE,
-      TYPE_INT,
-      TYPE_HWORD,
-      TYPE_LONG,
-      TYPE_WORD
-    } print_type;
-    err_t err = ERR_OK;
-    if (instruction.opcode == OP_PRINT_BYTE ||
-        instruction.opcode == OP_PRINT_CHAR)
-    {
-      print_type = instruction.opcode == OP_PRINT_BYTE ? TYPE_BYTE : TYPE_CHAR;
-      err        = vm_pop_byte(vm, &datum);
-    }
-    else if (instruction.opcode == OP_PRINT_HWORD ||
-             instruction.opcode == OP_PRINT_INT)
-    {
-      print_type = instruction.opcode == OP_PRINT_HWORD ? TYPE_HWORD : TYPE_INT;
-      err        = vm_pop_hword(vm, &datum);
-    }
-    else if (instruction.opcode == OP_PRINT_WORD ||
-             instruction.opcode == OP_PRINT_LONG)
-    {
-      print_type = instruction.opcode == OP_PRINT_WORD ? TYPE_WORD : TYPE_LONG;
-      err        = vm_pop_word(vm, &datum);
-    }
-
-    if (err)
-      return err;
-
-    switch (print_type)
-    {
-    case TYPE_CHAR: {
-      char c = 0;
-      memcpy(&c, &datum.as_byte, 1);
-      printf("%c", c);
-      break;
-    }
-    case TYPE_BYTE:
-      printf("0x%x", datum.as_byte);
-      break;
-    case TYPE_INT: {
-      int32_t i = 0;
-      memcpy(&i, &datum.as_hword, HWORD_SIZE);
-      printf("%" PRId32, i);
-      break;
-    }
-    case TYPE_HWORD:
-      printf("%" PRIu32, datum.as_hword);
-      break;
-    case TYPE_LONG: {
-      int64_t i = 0;
-      memcpy(&i, &datum.as_word, WORD_SIZE);
-      printf("%" PRId64, i);
-      break;
-    }
-    case TYPE_WORD:
-      printf("%" PRIu64, datum.as_word);
-      break;
-    }
-
-    prog->ptr++;
-  }
-  else if (instruction.opcode == OP_HALT)
-  {
-    // Do nothing here.  Should be caught by callers of vm_execute
-  }
-  else
-    return ERR_INVALID_OPCODE;
-  return ERR_OK;
-}
-
-err_t vm_execute_all(vm_t *vm)
-{
-  struct Program *program = &vm->program;
-  err_t err               = ERR_OK;
-#if VERBOSE == 1
-  struct Registers prev_registers = vm->registers;
-  size_t cycles                   = 0;
-  size_t prev_sptr                = 0;
-#endif
-  while (program->instructions[program->ptr].opcode != OP_HALT &&
-         program->ptr < program->max)
-  {
-#if VERBOSE >= 1
-    fprintf(stdout, "[vm_execute_all]: Trace(Cycle %lu)\n", cycles);
-    fputs(
-        "----------------------------------------------------------------------"
-        "----------\n",
-        stdout);
-    vm_print_program(vm, stdout);
-    fputs(
-        "----------------------------------------------------------------------"
-        "----------\n",
-        stdout);
-    if (memcmp(prev_registers.reg, vm->registers.reg,
-               ARR_SIZE(vm->registers.reg)) != 0)
-    {
-      vm_print_registers(vm, stdout);
-      prev_registers = vm->registers;
-      fputs("------------------------------------------------------------------"
-            "----"
-            "----------\n",
-            stdout);
-    }
-    if (prev_sptr != vm->stack.ptr)
-    {
-      vm_print_stack(vm, stdout);
-      prev_sptr = vm->stack.ptr;
-      fputs("------------------------------------------------------------------"
-            "----"
-            "----------\n",
-            stdout);
-    }
-    ++cycles;
-#endif
-    err = vm_execute(vm);
-    if (err)
-      return err;
-  }
-
-#if VERBOSE >= 1
-  fprintf(stdout, "[vm_execute_all]: Final VM state(Cycle %lu)\n", cycles);
-  vm_print_all(vm, stdout);
-#endif
-  return err;
-}
-
-void vm_load_stack(vm_t *vm, byte *bytes, size_t size)
-{
-  vm->stack.data = bytes;
-  vm->stack.max  = size;
-  vm->stack.ptr  = 0;
-}
-
-void vm_load_program(vm_t *vm, inst_t *instructions, size_t size)
-{
-  vm->program.instructions = instructions;
-  vm->program.max          = size;
-  vm->program.ptr          = 0;
-}
-
-void vm_print_registers(vm_t *vm, FILE *fp)
-{
-  struct Registers reg = vm->registers;
-  fprintf(fp, "Registers.reg = [");
-  for (size_t i = 0; i < VM_REGISTERS; ++i)
-  {
-    fprintf(fp, "{%lu:%lX}", i, reg.reg[i]);
-    if (i != VM_REGISTERS - 1)
-      fprintf(fp, ", ");
-  }
-  fprintf(fp, "]\n");
-}
-
-void vm_print_stack(vm_t *vm, FILE *fp)
-{
-  struct Stack stack = vm->stack;
-  fprintf(fp, "Stack.max  = %lu\nStack.ptr  = %lu\nStack.data = [", stack.max,
-          stack.ptr);
-  if (stack.ptr == 0)
-  {
-    fprintf(fp, "]\n");
-    return;
-  }
-  printf("\n");
-  for (size_t i = stack.ptr; i > 0; --i)
-  {
-    byte b = stack.data[i - 1];
-    fprintf(fp, "\t%lu: %X", stack.ptr - i, b);
-    if (i != 1)
-      fprintf(fp, ", ");
-    fprintf(fp, "\n");
-  }
-  fprintf(fp, "]\n");
-}
-
-void vm_print_program(vm_t *vm, FILE *fp)
-{
-  struct Program program = vm->program;
-  fprintf(fp,
-          "Program.max          = %lu\nProgram.ptr          = "
-          "%lu\nProgram.instructions = [\n",
-          program.max, program.ptr);
-  size_t beg = 0;
-  if (program.ptr >= VM_PRINT_PROGRAM_EXCERPT)
-  {
-    fprintf(fp, "\t...\n");
-    beg = program.ptr - VM_PRINT_PROGRAM_EXCERPT;
-  }
-  else
-    beg = 0;
-  size_t end = MIN(program.ptr + VM_PRINT_PROGRAM_EXCERPT, program.max);
-  for (size_t i = beg; i < end; ++i)
-  {
-    fprintf(fp, "\t%lu: ", i);
-    inst_print(program.instructions[i], fp);
-    if (i == program.ptr)
-      fprintf(fp, " <---");
-    fprintf(fp, "\n");
-  }
-  if (end != program.max)
-    fprintf(fp, "\t...\n");
-  fprintf(fp, "]\n");
-}
-
-void vm_print_all(vm_t *vm, FILE *fp)
-{
-  fputs("----------------------------------------------------------------------"
-        "----------\n",
-        fp);
-  vm_print_program(vm, fp);
-  fputs("----------------------------------------------------------------------"
-        "----------\n",
-        fp);
-  vm_print_registers(vm, fp);
-  fputs("----------------------------------------------------------------------"
-        "----------\n",
-        fp);
-  vm_print_stack(vm, fp);
-  fputs("----------------------------------------------------------------------"
-        "----------\n",
-        fp);
-}
-
-err_t vm_jump(vm_t *vm, word w)
-{
-  if (w >= vm->program.max)
-    return ERR_INVALID_PROGRAM_ADDRESS;
-  vm->program.ptr = w;
-  return ERR_OK;
-}
-
-err_t vm_push_byte(vm_t *vm, data_t b)
-{
-  if (vm->stack.ptr >= vm->stack.max)
-    return ERR_STACK_OVERFLOW;
-  vm->stack.data[vm->stack.ptr++] = b.as_byte;
-  return ERR_OK;
-}
-
-err_t vm_push_hword(vm_t *vm, data_t f)
-{
-  if (vm->stack.ptr + HWORD_SIZE >= vm->stack.max)
-    return ERR_STACK_OVERFLOW;
-  byte bytes[HWORD_SIZE] = {0};
-  convert_hword_to_bytes(f.as_hword, bytes);
-  for (size_t i = 0; i < HWORD_SIZE; ++i)
-  {
-    byte b = bytes[HWORD_SIZE - i - 1];
-    vm_push_byte(vm, DBYTE(b));
-  }
-  return ERR_OK;
-}
-
-err_t vm_push_word(vm_t *vm, data_t w)
-{
-  if (vm->stack.ptr + WORD_SIZE >= vm->stack.max)
-    return ERR_STACK_OVERFLOW;
-  byte bytes[WORD_SIZE] = {0};
-  convert_word_to_bytes(w.as_word, bytes);
-  for (size_t i = 0; i < WORD_SIZE; ++i)
-  {
-    byte b = bytes[WORD_SIZE - i - 1];
-    vm_push_byte(vm, DBYTE(b));
-  }
-  return ERR_OK;
-}
-
-err_t vm_push_byte_register(vm_t *vm, byte reg)
-{
-  if (reg >= VM_REGISTERS * 8)
-    return ERR_INVALID_REGISTER_BYTE;
-
-  // Interpret each word based register as 8 byte registers
-  byte b = WORD_NTH_BYTE(vm->registers.reg[reg / 8], reg % 8);
-
-  return vm_push_byte(vm, DBYTE(b));
-}
-
-err_t vm_push_hword_register(vm_t *vm, byte reg)
-{
-  if (reg >= VM_REGISTERS * 2)
-    return ERR_INVALID_REGISTER_HWORD;
-  else if (vm->stack.ptr >= vm->stack.max)
-    return ERR_STACK_OVERFLOW;
-  // Interpret each word based register as 2 hword registers
-  hword hw = WORD_NTH_HWORD(vm->registers.reg[reg / 2], reg % 2);
-  return vm_push_hword(vm, DHWORD(hw));
-}
-
-err_t vm_push_word_register(vm_t *vm, byte reg)
-{
-  if (reg >= VM_REGISTERS)
-    return ERR_INVALID_REGISTER_WORD;
-  else if (vm->stack.ptr >= vm->stack.max)
-    return ERR_STACK_OVERFLOW;
-  return vm_push_word(vm, DWORD(vm->registers.reg[reg]));
-}
-
-err_t vm_mov_byte(vm_t *vm, byte reg)
-{
-  if (reg >= (VM_REGISTERS * 8))
-    return ERR_INVALID_REGISTER_BYTE;
-  data_t ret = {0};
-  err_t err  = vm_pop_byte(vm, &ret);
-  if (err)
-    return err;
-  word *reg_ptr = &vm->registers.reg[reg / 8];
-  size_t shift  = (reg % 8) * 8;
-  // This resets the bits in the specific byte register
-  *reg_ptr = *reg_ptr & ~(0xFF << shift);
-  // This sets the bits
-  *reg_ptr = (*reg_ptr) | (ret.as_word << shift);
-  return ERR_OK;
-}
-
-err_t vm_mov_hword(vm_t *vm, byte reg)
-{
-  if (reg >= (VM_REGISTERS * 2))
-    return ERR_INVALID_REGISTER_HWORD;
-  else if (vm->stack.ptr < sizeof(f64))
-    return ERR_STACK_UNDERFLOW;
-  data_t ret = {0};
-  err_t err  = vm_pop_hword(vm, &ret);
-  if (err)
-    return err;
-  word *reg_ptr = &vm->registers.reg[reg / 2];
-  size_t shift  = (reg % 2) * 2;
-  // This resets the bits in the specific hword register
-  *reg_ptr = *reg_ptr & ~(0xFFFFFFFF << shift);
-  // This sets the bits
-  *reg_ptr = (*reg_ptr) | (ret.as_word << shift);
-  return ERR_OK;
-}
-
-err_t vm_mov_word(vm_t *vm, byte reg)
-{
-  if (reg >= VM_REGISTERS)
-    return ERR_INVALID_REGISTER_WORD;
-  else if (vm->stack.ptr < sizeof(word))
-    return ERR_STACK_UNDERFLOW;
-  data_t ret = {0};
-  err_t err  = vm_pop_word(vm, &ret);
-  if (err)
-    return err;
-  vm->registers.reg[reg] = ret.as_word;
-  return ERR_OK;
-}
-
-err_t vm_dup_byte(vm_t *vm, word w)
-{
-  if (vm->stack.ptr < w + 1)
-    return ERR_STACK_UNDERFLOW;
-  return vm_push_byte(vm, DBYTE(vm->stack.data[vm->stack.ptr - 1 - w]));
-}
-
-err_t vm_dup_hword(vm_t *vm, word w)
-{
-  if (vm->stack.ptr < HWORD_SIZE * (w + 1))
-    return ERR_STACK_UNDERFLOW;
-  byte bytes[HWORD_SIZE] = {0};
-  for (size_t i = 0; i < HWORD_SIZE; ++i)
-    bytes[HWORD_SIZE - i - 1] =
-        vm->stack.data[vm->stack.ptr - (HWORD_SIZE * (w + 1)) + i];
-  return vm_push_hword(vm, DHWORD(convert_bytes_to_hword(bytes)));
-}
-
-err_t vm_dup_word(vm_t *vm, word w)
-{
-  if (vm->stack.ptr < WORD_SIZE * (w + 1))
-    return ERR_STACK_UNDERFLOW;
-  byte bytes[WORD_SIZE] = {0};
-  for (size_t i = 0; i < WORD_SIZE; ++i)
-    bytes[WORD_SIZE - i - 1] =
-        vm->stack.data[vm->stack.ptr - (WORD_SIZE * (w + 1)) + i];
-  return vm_push_word(vm, DWORD(convert_bytes_to_word(bytes)));
-}
-
-err_t vm_pop_byte(vm_t *vm, data_t *ret)
-{
-  if (vm->stack.ptr == 0)
-    return ERR_STACK_UNDERFLOW;
-  *ret = DBYTE(vm->stack.data[--vm->stack.ptr]);
-  return ERR_OK;
-}
-
-err_t vm_pop_hword(vm_t *vm, data_t *ret)
-{
-  if (vm->stack.ptr < HWORD_SIZE)
-    return ERR_STACK_UNDERFLOW;
-  byte bytes[HWORD_SIZE] = {0};
-  for (size_t i = 0; i < HWORD_SIZE; ++i)
-  {
-    data_t b = {0};
-    vm_pop_byte(vm, &b);
-    bytes[i] = b.as_byte;
-  }
-  *ret = DWORD(convert_bytes_to_hword(bytes));
-  return ERR_OK;
-}
-
-err_t vm_pop_word(vm_t *vm, data_t *ret)
-{
-  if (vm->stack.ptr < WORD_SIZE)
-    return ERR_STACK_UNDERFLOW;
-  byte bytes[WORD_SIZE] = {0};
-  for (size_t i = 0; i < WORD_SIZE; ++i)
-  {
-    data_t b = {0};
-    vm_pop_byte(vm, &b);
-    bytes[i] = b.as_byte;
-  }
-  *ret = DWORD(convert_bytes_to_word(bytes));
-  return ERR_OK;
-}
-
-err_t vm_not_byte(vm_t *vm)
-{
-  data_t a  = {0};
-  err_t err = vm_pop_byte(vm, &a);
-  if (err)
-    return err;
-  return vm_push_byte(vm, DBYTE(!a.as_byte));
-}
-
-err_t vm_not_hword(vm_t *vm)
-{
-  data_t a  = {0};
-  err_t err = vm_pop_hword(vm, &a);
-  if (err)
-    return err;
-  return vm_push_hword(vm, DHWORD(!a.as_hword));
-}
-
-err_t vm_not_word(vm_t *vm)
-{
-  data_t a  = {0};
-  err_t err = vm_pop_word(vm, &a);
-  if (err)
-    return err;
-  return vm_push_word(vm, DWORD(!a.as_word));
-}
-
-err_t vm_or_byte(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_byte(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_byte(vm, &b);
-  if (err)
-    return err;
-  return vm_push_byte(vm, DBYTE(a.as_byte | b.as_byte));
-}
-
-err_t vm_or_hword(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_hword(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_hword(vm, &b);
-  if (err)
-    return err;
-  return vm_push_hword(vm, DHWORD(a.as_hword | b.as_hword));
-}
-
-err_t vm_or_word(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_word(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_word(vm, &b);
-  if (err)
-    return err;
-  return vm_push_word(vm, DWORD(a.as_word | b.as_word));
-}
-
-err_t vm_and_byte(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_byte(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_byte(vm, &b);
-  if (err)
-    return err;
-  return vm_push_byte(vm, DBYTE(a.as_byte & b.as_byte));
-}
-
-err_t vm_and_hword(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_hword(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_hword(vm, &b);
-  if (err)
-    return err;
-  return vm_push_hword(vm, DHWORD(a.as_hword & b.as_hword));
-}
-
-err_t vm_and_word(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_word(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_word(vm, &b);
-  if (err)
-    return err;
-  return vm_push_word(vm, DWORD(a.as_word & b.as_word));
-}
-
-err_t vm_xor_byte(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_byte(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_byte(vm, &b);
-  if (err)
-    return err;
-  return vm_push_byte(vm, DBYTE(a.as_byte ^ b.as_byte));
-}
-
-err_t vm_xor_hword(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_hword(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_hword(vm, &b);
-  if (err)
-    return err;
-  return vm_push_hword(vm, DHWORD(a.as_hword ^ b.as_hword));
-}
-
-err_t vm_xor_word(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_word(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_word(vm, &b);
-  if (err)
-    return err;
-  return vm_push_word(vm, DWORD(a.as_word ^ b.as_word));
-}
-
-err_t vm_eq_byte(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_byte(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_byte(vm, &b);
-  if (err)
-    return err;
-  return vm_push_byte(vm, DBYTE(a.as_byte == b.as_byte));
-}
-
-err_t vm_eq_hword(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_hword(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_hword(vm, &b);
-  if (err)
-    return err;
-  return vm_push_hword(vm, DHWORD(a.as_hword == b.as_hword));
-}
-
-err_t vm_eq_word(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_word(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_word(vm, &b);
-  if (err)
-    return err;
-  return vm_push_word(vm, DWORD(a.as_word == b.as_word));
-}
-
-err_t vm_plus_byte(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_byte(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_byte(vm, &b);
-  if (err)
-    return err;
-  return vm_push_byte(vm, DBYTE(a.as_byte + b.as_byte));
-}
-
-err_t vm_plus_hword(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_hword(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_hword(vm, &b);
-  if (err)
-    return err;
-  return vm_push_hword(vm, DHWORD(a.as_hword + b.as_hword));
-}
-
-err_t vm_plus_word(vm_t *vm)
-{
-  data_t a = {0}, b = {0};
-  err_t err = vm_pop_word(vm, &a);
-  if (err)
-    return err;
-  err = vm_pop_word(vm, &b);
-  if (err)
-    return err;
-  return vm_push_word(vm, DWORD(a.as_word + b.as_word));
-}