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implemented type alignment, size and fixed cycling definition checking

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This commit is contained in:
Lorenzo Torres 2025-12-05 14:16:22 +01:00
parent 135baed51e
commit 9d6498637f
3 changed files with 51 additions and 3 deletions
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50
sema.c
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@ -29,7 +29,8 @@ static void error(ast_node *n, char *msg)
static char *intern_string(sema *s, char *str, usize len)
{
char *ptr = arena_alloc(s->allocator, len + 1);
(void) s;
char *ptr = malloc(len + 1);
memcpy(ptr, str, len);
ptr[len] = '\0';
return ptr;
@ -119,14 +120,57 @@ static void order_type(sema *s, ast_node *node)
}
}
static type *get_type(sema *s, ast_node *n)
{
switch (n->type) {
case NODE_IDENTIFIER:
char *name = intern_string(s, n->expr.string.start, n->expr.string.len);
type *t = shget(type_reg, name);
free(name);
return t;
default:
error(n, "expected type.");
return NULL;
}
}
static void register_struct(sema *s, char *name, type *t)
{
usize alignment = 0;
member *m = t->data.structure.members;
while (m) {
//if (alignment < m->
type *m_type = get_type(s, m->type);
if (alignment < m_type->alignment) {
alignment = m_type->alignment;
}
m = m->next;
}
t->alignment = alignment;
m = t->data.structure.members;
usize offset = 0;
type *m_type = NULL;
while (m) {
m_type = get_type(s, m->type);
usize padding = (m_type->alignment - (offset % m_type->alignment)) % m_type->alignment;
offset += padding;
m->offset = offset;
offset += m_type->size;
m = m->next;
}
if (t->alignment > 0) {
usize trailing_padding = (t->alignment - (offset % t->alignment)) % t->alignment;
offset += trailing_padding;
}
t->size = offset;
printf("size: %ld\n", t->size);
}
static void register_union(sema *s, char *name, type *t)
@ -216,7 +260,7 @@ end:
}
}
if (arrlen(ordered) != node_count) {
if (arrlen(ordered) < node_count) {
error(NULL, "cycling struct definition.");
}