-static void psi_ffi_type_dtor(void *type) {
- ffi_type *strct = type;
-
- if (strct->elements) {
- ffi_type **ptr;
-
- for (ptr = strct->elements; *ptr; ++ptr) {
- free(*ptr);
- }
- free(strct->elements);
- }
- free(strct);
-}
-
-static size_t psi_ffi_struct_type_pad(ffi_type **els, size_t padding) {
- size_t i;
-
- for (i = 0; i < padding; ++i) {
- ffi_type *pad = pemalloc(sizeof(*pad), 1);
-
- memcpy(pad, &ffi_type_schar, sizeof(*pad));
- *els++ = pad;
- }
-
- return padding;
-}
-
-struct psi_ffi_struct_element_storage {
- ffi_type **els;
- size_t nels;
- size_t argc;
- size_t offset;
- size_t max_align;
- size_t last_arg_pos;
-};
-
-static inline void psi_ffi_struct_type_element(
- struct psi_ffi_struct_element_storage *s, struct psi_decl_arg *darg,
- ffi_type *darg_type) {
-
- ffi_type *type;
- size_t padding;
-
- if (darg->layout->pos == s->last_arg_pos) {
- /* skip bit fields */
- return;
- }
- s->last_arg_pos = darg->layout->pos;
-
- type = pemalloc(sizeof(*type), 1);
- *type = *darg_type;
-
- if (type->alignment > s->max_align) {
- s->max_align = type->alignment;
- }
-
- assert(type->size <= darg->layout->len);
- if ((padding = psi_offset_padding(darg->layout->pos - s->offset, type->alignment))) {
- if (s->nels + padding + 1 > s->argc) {
- s->argc += padding;
- s->els = safe_perealloc(s->els, (s->argc + 1), sizeof(*s->els), 0, 1);
- s->els[s->argc] = NULL;
- }
- psi_ffi_struct_type_pad(&s->els[s->nels], padding);
- s->nels += padding;
- s->offset += padding;
- }
- assert(s->offset == darg->layout->pos);
-
- s->offset = (s->offset + darg->layout->len + type->alignment - 1) & ~(type->alignment - 1);
- s->els[s->nels++] = type;
-}
-
-static ffi_type **psi_ffi_struct_type_elements(struct psi_decl_struct *strct) {
- size_t i = 0;
- struct psi_decl_arg *darg;
- struct psi_ffi_struct_element_storage s = {0};
-
- s.last_arg_pos = -1;
- s.argc = psi_plist_count(strct->args);
- s.els = pecalloc(s.argc + 1, sizeof(*s.els), 1);
-
- while (psi_plist_get(strct->args, i++, &darg)) {
- psi_ffi_struct_type_element(&s, darg, psi_ffi_decl_arg_type(darg));
- }
-
- /* apply struct alignment padding */
- s.offset = (s.offset + s.max_align - 1) & ~(s.max_align - 1);
-
- assert(s.offset <= strct->size);
- if (s.offset < strct->size) { /* WTF? */
- size_t padding = strct->size - s.offset;
-
- s.els = safe_perealloc(s.els, (padding + s.argc + 1), sizeof(*s.els), 0, 1);
- psi_ffi_struct_type_pad(&s.els[s.nels], padding);
- s.els[s.argc + padding] = NULL;
- }