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Added opcode OP_DUP_*

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Duplicates the nth datum off the stack, pushing it to the top.  Useful
for operations such as MOV which eat the stack.
This commit is contained in:
Aryadev Chavali
2023-10-22 20:26:17 +01:00
parent 137a6d3b75
commit b20ad511a0
2 changed files with 25 additions and 0 deletions
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18
src/inst.c
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@@ -59,6 +59,15 @@ const char *opcode_as_cstr(opcode_t code)
case OP_MOV_HWORD:
return "MOV_HWORD";
break;
case OP_DUP_BYTE:
return "DUP_BYTE";
break;
case OP_DUP_HWORD:
return "DUP_HWORD";
break;
case OP_DUP_WORD:
return "DUP_WORD";
break;
case OP_NOT_BYTE:
return "NOT_BYTE";
break;
@@ -182,6 +191,11 @@ void inst_print(inst_t instruction, FILE *fp)
fprintf(fp, "reg=0x");
data_print(instruction.operand, DATA_TYPE_BYTE, fp);
}
else if (OPCODE_IS_TYPE(instruction.opcode, OP_DUP))
{
fprintf(fp, "n=");
data_print(instruction.operand, DATA_TYPE_WORD, fp);
}
fprintf(fp, ")");
}
@@ -218,6 +232,8 @@ void inst_write_bytecode(inst_t inst, darr_t *darr)
else if (OPCODE_IS_TYPE(inst.opcode, OP_PUSH_REGISTER) ||
OPCODE_IS_TYPE(inst.opcode, OP_MOV))
to_append = DATA_TYPE_BYTE;
else if (OPCODE_IS_TYPE(inst.opcode, OP_DUP))
to_append = DATA_TYPE_WORD;
switch (to_append)
{
@@ -292,6 +308,8 @@ inst_t inst_read_bytecode(darr_t *darr)
else if (OPCODE_IS_TYPE(opcode, OP_PUSH_REGISTER) ||
OPCODE_IS_TYPE(opcode, OP_MOV))
inst.operand = read_type_from_darr(darr, DATA_TYPE_BYTE);
else if (OPCODE_IS_TYPE(opcode, OP_DUP))
inst.operand = read_type_from_darr(darr, DATA_TYPE_WORD);
// Otherwise opcode doesn't take operands
inst.opcode = opcode;