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Added and implemented OP_JUMP_(STACK|REGISTER)

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Uses the stack and register, respectively, to jump to an absolute
address.  The stack based jump pops a word off the stack to perform a
jump, while the register based one uses the operand to figure out
which register to use.
This commit is contained in:
Aryadev Chavali
2023-10-22 20:57:29 +01:00
parent d8e45fce04
commit 7f1994c7aa
3 changed files with 39 additions and 10 deletions
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14
src/runtime.c
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@@ -19,7 +19,7 @@
void vm_execute(vm_t *vm)
{
static_assert(NUMBER_OF_OPCODES == 32, "vm_execute: Out of date");
static_assert(NUMBER_OF_OPCODES == 34, "vm_execute: Out of date");
struct Program *prog = &vm->program;
if (prog->ptr >= prog->max)
// TODO: Error (Went past end of program)
@@ -96,6 +96,18 @@ void vm_execute(vm_t *vm)
// Set prog->ptr to the jump point requested
prog->ptr = instruction.operand.as_word;
}
else if (instruction.opcode == OP_JUMP_STACK)
{
// Set prog->ptr to the word on top of the stack
prog->ptr = vm_pop_word(vm).as_word;
}
else if (instruction.opcode == OP_JUMP_REGISTER)
{
if (instruction.operand.as_byte >= 8)
// TODO: Error register is not a valid word register
return;
prog->ptr = vm->registers.reg[instruction.operand.as_byte];
}
else if (instruction.opcode == OP_HALT)
{
// Do nothing here. Should be caught by callers of vm_execute