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Remove JUMP_STACK and CALL_STACK

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Any program that generates addresses at runtime can be easily
expressed through fixed address jumps and calls.  No need for them.
This commit is contained in:
Aryadev Chavali
2024-07-07 02:57:19 +01:00
parent ebdb1a948d
commit edf90780af
3 changed files with 5 additions and 31 deletions
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22
vm/runtime.c
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@@ -61,7 +61,7 @@ const char *err_as_cstr(err_t err)
}
}
static_assert(NUMBER_OF_OPCODES == 117, "vm_execute: Out of date");
static_assert(NUMBER_OF_OPCODES == 115, "vm_execute: Out of date");
err_t vm_execute(vm_t *vm)
{
@@ -135,15 +135,6 @@ err_t vm_execute(vm_t *vm)
// Opcodes defined in loop
else if (instruction.opcode == OP_JUMP_ABS)
return vm_jump(vm, instruction.operand.as_word);
else if (instruction.opcode == OP_JUMP_STACK)
{
data_t ret = {0};
// Set prog->ptr to the word on top of the stack
err_t err = vm_pop_word(vm, &ret);
if (err)
return err;
return vm_jump(vm, ret.as_word);
}
else if (UNSIGNED_OPCODE_IS_TYPE(instruction.opcode, OP_JUMP_IF))
{
static_assert(DATA_TYPE_NIL == -1 && DATA_TYPE_WORD == 3,
@@ -172,17 +163,6 @@ err_t vm_execute(vm_t *vm)
vm->call_stack.address_pointers[vm->call_stack.ptr++] = vm->program.ptr + 1;
return vm_jump(vm, instruction.operand.as_word);
}
else if (instruction.opcode == OP_CALL_STACK)
{
if (vm->call_stack.ptr >= vm->call_stack.max)
return ERR_CALL_STACK_OVERFLOW;
vm->call_stack.address_pointers[vm->call_stack.ptr++] = vm->program.ptr + 1;
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_RET)
{
if (vm->call_stack.ptr == 0)