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Implemented functions to pop a byte and a word

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This commit is contained in:
Aryadev Chavali
2023-10-15 04:40:14 +01:00
parent d52d7ad413
commit 1180833161
1 changed files with 21 additions and 0 deletions
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21
src/main.c
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@@ -44,6 +44,7 @@ typedef union
void vm_push_byte(vm_t *vm, data_t b) void vm_push_byte(vm_t *vm, data_t b)
{ {
if (vm->stack.pointer >= VM_STACK_MAX) if (vm->stack.pointer >= VM_STACK_MAX)
// TODO: Error STACK_OVERFLOW
return; return;
vm->stack.data[vm->stack.pointer++] = b.as_byte; vm->stack.data[vm->stack.pointer++] = b.as_byte;
} }
@@ -52,11 +53,31 @@ void vm_push_word(vm_t *vm, data_t w)
{ {
// NOTE: Relies on sizeof measuring in bytes // NOTE: Relies on sizeof measuring in bytes
if (vm->stack.pointer + sizeof(w) >= VM_STACK_MAX) if (vm->stack.pointer + sizeof(w) >= VM_STACK_MAX)
// TODO: Error STACK_OVERFLOW
return; return;
memcpy(vm->stack.data + vm->stack.pointer, &w.as_word, sizeof(w.as_word)); memcpy(vm->stack.data + vm->stack.pointer, &w.as_word, sizeof(w.as_word));
vm->stack.pointer += sizeof(w.as_word); vm->stack.pointer += sizeof(w.as_word);
} }
byte vm_pop_byte(vm_t *vm)
{
if (vm->stack.pointer == 0)
// TODO: Error STACK_UNDERFLOW
return 0;
return vm->stack.data[--vm->stack.pointer];
}
word vm_pop_word(vm_t *vm)
{
if (vm->stack.pointer < sizeof(word))
// TODO: Error STACK_UNDERFLOW
return 0;
word w = 0;
memcpy(&w, vm->stack.data + vm->stack.pointer - sizeof(w), sizeof(w));
vm->stack.pointer -= sizeof(w);
return w;
}
int main(void) int main(void)
{ {
puts("Hello, world!"); puts("Hello, world!");