op_control.hc

来自「专业汽车级嵌入式操作系统OSEK的源代码」· HC 代码 · 共 127 行

/**
 * This is included inside a switch statement.
 */

case OP_IF_ICMPEQ:
case OP_IF_ACMPEQ:
  // Arguments: 2
  // Stack: -2
  do_isub();
  // Fall through!
case OP_IFEQ:
case OP_IFNULL:
  // Arguments: 2
  // Stack: -1
  do_goto (pop_word() == 0);
  goto LABEL_ENGINELOOP;
case OP_IF_ICMPNE:
case OP_IF_ACMPNE:
  do_isub();
  // Fall through!
case OP_IFNE:
case OP_IFNONNULL:
  do_goto (pop_word() != 0);
  goto LABEL_ENGINELOOP;
case OP_IF_ICMPLT:
  do_isub();
  // Fall through!
case OP_IFLT:
  do_goto (pop_jint() < 0);
  goto LABEL_ENGINELOOP;
case OP_IF_ICMPLE:
  do_isub();
  // Fall through!
case OP_IFLE:
  do_goto (pop_jint() <= 0);
  goto LABEL_ENGINELOOP;
case OP_IF_ICMPGE:
  do_isub();
  // Fall through!
case OP_IFGE:
  do_goto (pop_jint() >= 0);
  goto LABEL_ENGINELOOP;
case OP_IF_ICMPGT:
  do_isub();
  // Fall through!
case OP_IFGT:
  do_goto (pop_jint() > 0);
  goto LABEL_ENGINELOOP;


case OP_JSR:
  // Arguments: 2
  // Stack: +1
  push_word (ptr2word (pc + 2));
  // Fall through!
case OP_GOTO:
  // Arguments: 2
  // Stack: +0
  do_goto (true);
  // No pc increment!
  goto LABEL_ENGINELOOP;
case OP_RET:
  // Arguments: 1
  // Stack: +0
  pc = word2ptr (get_local_word (pc[0]));
  #if DEBUG_BYTECODE
  printf ("\n  OP_RET: returning to %d\n", (int) pc);
  #endif
  // No pc increment!
  goto LABEL_ENGINELOOP;

#if FP_ARITHMETIC

case OP_DCMPL:
case OP_DCMPG:
  // TBD: no distinction between opcodes
  {
    STACKWORD wrd1;
    STACKWORD wrd2;

    wrd2 = pop_word();
    just_pop_word();
    wrd1 = pop_word();
    just_pop_word();
    do_fcmp (word2jfloat(wrd1), word2jfloat (wrd2), 0);
  }
  goto LABEL_ENGINELOOP;

case OP_FCMPL:
case OP_FCMPG:
  // TBD: no distinction between opcodes
  tempStackWord = pop_word();
  do_fcmp (word2jfloat(pop_word()), word2jfloat(tempStackWord), 0);
  goto LABEL_ENGINELOOP;
  
#endif // FP_ARITHMETIC

#if 0
  
case OP_LCMP:
  // Arguments: 0
  // Stack: -4 + 1
  {
    JLONG l1, l2;
    JINT c;

    pop_jlong (&l2);
    pop_jlong (&l1);
    c = jlong_compare (l1, l2);
    push_word ((c == 0) ? 0 : ((c < 0) ? -1 : +1));
  }
  goto LABEL_ENGINELOOP;    

#endif // 0

// Notes:
// - Not supported: TABLESWITCH, LOOKUPSWITCH, GOTO_W, JSR_W, LCMP

/*end*/