72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
#include "libc/mem/mem.h"
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#include "third_party/dlmalloc/dlmalloc.h"
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static void internal_inspect_all(mstate m,
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void (*handler)(void* start, void* end,
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size_t used_bytes,
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void* callback_arg),
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void* arg) {
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if (is_initialized(m)) {
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mchunkptr top = m->top;
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msegmentptr s;
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for (s = &m->seg; s != 0; s = s->next) {
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mchunkptr q = align_as_chunk(s->base);
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while (segment_holds(s, q) && q->head != FENCEPOST_HEAD) {
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mchunkptr next = next_chunk(q);
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size_t sz = chunksize(q);
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size_t used;
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void* start;
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if (is_inuse(q)) {
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used = sz - CHUNK_OVERHEAD; /* must not be mmapped */
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start = chunk2mem(q);
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} else {
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used = 0;
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if (is_small(sz)) { /* offset by possible bookkeeping */
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start = (void*)((char*)q + sizeof(struct malloc_chunk));
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} else {
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start = (void*)((char*)q + sizeof(struct malloc_tree_chunk));
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}
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}
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if (start < (void*)next) /* skip if all space is bookkeeping */
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handler(start, next, used, arg);
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if (q == top) break;
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q = next;
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}
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}
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}
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}
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/**
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* Traverses the heap and calls the given handler for each managed
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* region, skipping all bytes that are (or may be) used for bookkeeping
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* purposes. Traversal does not include include chunks that have been
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* directly memory mapped. Each reported region begins at the start
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* address, and continues up to but not including the end address. The
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* first used_bytes of the region contain allocated data. If
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* used_bytes is zero, the region is unallocated. The handler is
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* invoked with the given callback argument. If locks are defined, they
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* are held during the entire traversal. It is a bad idea to invoke
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* other malloc functions from within the handler.
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*
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* For example, to count the number of in-use chunks with size greater
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* than 1000, you could write:
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*
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* static int count = 0;
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* void count_chunks(void* start, void* end, size_t used, void* arg) {
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* if (used >= 1000) ++count;
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* }
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*
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* then,
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*
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* malloc_inspect_all(count_chunks, NULL);
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*/
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void malloc_inspect_all(void (*handler)(void* start, void* end,
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size_t used_bytes, void* callback_arg),
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void* arg) {
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ensure_initialization();
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if (!PREACTION(g_dlmalloc)) {
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internal_inspect_all(g_dlmalloc, handler, arg);
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POSTACTION(g_dlmalloc);
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}
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}
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