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Add macro for size of a word

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Smaller number of changes necessary to change types.
This commit is contained in:
Aryadev Chavali
2023-10-15 05:03:09 +01:00
parent cfc9edebba
commit 54b836ba64
1 changed files with 17 additions and 15 deletions
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32
src/main.c
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@@ -24,6 +24,17 @@ typedef double f64;
typedef uint8_t byte;
typedef u64 word;
#define WORD_SIZE sizeof(word)
typedef union
{
byte as_byte;
word as_word;
} data_t;
#define DBYTE(BYTE) ((data_t){.as_byte = (BYTE)})
#define DWORD(WORD) ((data_t){.as_word = (WORD)})
#define VM_STACK_MAX 1024
typedef struct
@@ -35,15 +46,6 @@ typedef struct
} stack;
} vm_t;
typedef union
{
byte as_byte;
word as_word;
} data_t;
#define DBYTE(BYTE) ((data_t){.as_byte = (BYTE)})
#define DWORD(WORD) ((data_t){.as_word = (WORD)})
void vm_push_byte(vm_t *vm, data_t b)
{
if (vm->stack.pointer >= VM_STACK_MAX)
@@ -55,11 +57,11 @@ void vm_push_byte(vm_t *vm, data_t b)
void vm_push_word(vm_t *vm, data_t w)
{
// NOTE: Relies on sizeof measuring in bytes
if (vm->stack.pointer + sizeof(w) >= VM_STACK_MAX)
if (vm->stack.pointer + WORD_SIZE >= VM_STACK_MAX)
// TODO: Error STACK_OVERFLOW
return;
memcpy(vm->stack.data + vm->stack.pointer, &w.as_word, sizeof(w.as_word));
vm->stack.pointer += sizeof(w.as_word);
memcpy(vm->stack.data + vm->stack.pointer, &w.as_word, WORD_SIZE);
vm->stack.pointer += WORD_SIZE;
}
byte vm_pop_byte(vm_t *vm)
@@ -72,12 +74,12 @@ byte vm_pop_byte(vm_t *vm)
word vm_pop_word(vm_t *vm)
{
if (vm->stack.pointer < sizeof(word))
if (vm->stack.pointer < WORD_SIZE)
// 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);
memcpy(&w, vm->stack.data + vm->stack.pointer - WORD_SIZE, WORD_SIZE);
vm->stack.pointer -= WORD_SIZE;
return w;
}