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#include <assert.h>
#include "boxed_region.h"
#include "rust_internal.h"
// #define DUMP_BOXED_REGION
rust_opaque_box *boxed_region::malloc(type_desc *td) {
size_t header_size = sizeof(rust_opaque_box);
size_t body_size = td->size;
size_t body_align = td->align;
size_t total_size = align_to(header_size, body_align) + body_size;
rust_opaque_box *box =
(rust_opaque_box*)backing_region->malloc(total_size, "@");
box->td = td;
box->ref_count = 1;
box->prev = NULL;
box->next = live_allocs;
if (live_allocs) live_allocs->prev = box;
live_allocs = box;
# ifdef DUMP_BOXED_REGION
fprintf(stderr, "Allocated box %p with td %p,"
" size %lu==%lu+%lu, align %lu, prev %p, next %p\n",
box, td, total_size, header_size, body_size, body_align,
box->prev, box->next);
# endif
return box;
}
rust_opaque_box *boxed_region::calloc(type_desc *td) {
rust_opaque_box *box = malloc(td);
memset(box_body(box), 0, td->size);
return box;
}
void boxed_region::free(rust_opaque_box *box) {
// This turns out to not be true in various situations,
// like when we are unwinding after a failure.
//
// assert(box->ref_count == 0);
// This however should always be true. Helps to detect
// double frees (kind of).
assert(box->td != NULL);
# ifdef DUMP_BOXED_REGION
fprintf(stderr, "Freed box %p with td %p, prev %p, next %p\n",
box, box->td, box->prev, box->next);
# endif
if (box->prev) box->prev->next = box->next;
if (box->next) box->next->prev = box->prev;
if (live_allocs == box) live_allocs = box->next;
box->prev = NULL;
box->next = NULL;
box->td = NULL;
backing_region->free(box);
}
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