1 files changed, 52 insertions, 0 deletions
diff --git a/deps/jemalloc/include/jemalloc/internal/san_bump.h b/deps/jemalloc/include/jemalloc/internal/san_bump.h
new file mode 100644
index 000000000..8ec4a710d
--- /dev/null
+++ b/deps/jemalloc/include/jemalloc/internal/san_bump.h
@@ -0,0 +1,52 @@
+#ifndef JEMALLOC_INTERNAL_SAN_BUMP_H
+#define JEMALLOC_INTERNAL_SAN_BUMP_H
+
+#include "jemalloc/internal/edata.h"
+#include "jemalloc/internal/exp_grow.h"
+#include "jemalloc/internal/mutex.h"
+
+#define SBA_RETAINED_ALLOC_SIZE ((size_t)4 << 20)
+
+extern bool opt_retain;
+
+typedef struct ehooks_s ehooks_t;
+typedef struct pac_s pac_t;
+
+typedef struct san_bump_alloc_s san_bump_alloc_t;
+struct san_bump_alloc_s {
+	malloc_mutex_t mtx;
+
+	edata_t *curr_reg;
+};
+
+static inline bool
+san_bump_enabled() {
+	/*
+	 * We enable san_bump allocator only when it's possible to break up a
+	 * mapping and unmap a part of it (maps_coalesce). This is needed to
+	 * ensure the arena destruction process can destroy all retained guarded
+	 * extents one by one and to unmap a trailing part of a retained guarded
+	 * region when it's too small to fit a pending allocation.
+	 * opt_retain is required, because this allocator retains a large
+	 * virtual memory mapping and returns smaller parts of it.
+	 */
+	return maps_coalesce && opt_retain;
+}
+
+static inline bool
+san_bump_alloc_init(san_bump_alloc_t* sba) {
+	bool err = malloc_mutex_init(&sba->mtx, "sanitizer_bump_allocator",
+	    WITNESS_RANK_SAN_BUMP_ALLOC, malloc_mutex_rank_exclusive);
+	if (err) {
+		return true;
+	}
+	sba->curr_reg = NULL;
+
+	return false;
+}
+
+edata_t *
+san_bump_alloc(tsdn_t *tsdn, san_bump_alloc_t* sba, pac_t *pac, ehooks_t *ehooks,
+    size_t size, bool zero);
+
+#endif /* JEMALLOC_INTERNAL_SAN_BUMP_H */