Function je_xallocx

deps/jemalloc/src/jemalloc.c:3389–3457

}

JEMALLOC_EXPORT size_t JEMALLOC_NOTHROW
je_xallocx(void *ptr, size_t size, size_t extra, int flags) {
	tsd_t *tsd;
	size_t usize, old_usize;
	size_t alignment = MALLOCX_ALIGN_GET(flags);
	bool zero = flags & MALLOCX_ZERO;

	LOG("core.xallocx.entry", "ptr: %p, size: %zu, extra: %zu, "
	    "flags: %d", ptr, size, extra, flags);

	assert(ptr != NULL);
	assert(size != 0);
	assert(SIZE_T_MAX - size >= extra);
	assert(malloc_initialized() || IS_INITIALIZER);
	tsd = tsd_fetch();
	check_entry_exit_locking(tsd_tsdn(tsd));

	alloc_ctx_t alloc_ctx;
	rtree_ctx_t *rtree_ctx = tsd_rtree_ctx(tsd);
	rtree_szind_slab_read(tsd_tsdn(tsd), &extents_rtree, rtree_ctx,
	    (uintptr_t)ptr, true, &alloc_ctx.szind, &alloc_ctx.slab);
	assert(alloc_ctx.szind != SC_NSIZES);
	old_usize = sz_index2size(alloc_ctx.szind);
	assert(old_usize == isalloc(tsd_tsdn(tsd), ptr));
	/*
	 * The API explicitly absolves itself of protecting against (size +
	 * extra) numerical overflow, but we may need to clamp extra to avoid
	 * exceeding SC_LARGE_MAXCLASS.
	 *
	 * Ordinarily, size limit checking is handled deeper down, but here we
	 * have to check as part of (size + extra) clamping, since we need the
	 * clamped value in the above helper functions.
	 */
	if (unlikely(size > SC_LARGE_MAXCLASS)) {
		usize = old_usize;
		goto label_not_resized;
	}
	if (unlikely(SC_LARGE_MAXCLASS - size < extra)) {
		extra = SC_LARGE_MAXCLASS - size;
	}

	if (config_prof && opt_prof) {
		usize = ixallocx_prof(tsd, ptr, old_usize, size, extra,
		    alignment, zero, &alloc_ctx);
	} else {
		usize = ixallocx_helper(tsd_tsdn(tsd), ptr, old_usize, size,
		    extra, alignment, zero);
	}
	if (unlikely(usize == old_usize)) {
		goto label_not_resized;
	}

	if (config_stats) {
		*tsd_thread_allocatedp_get(tsd) += usize;
		*tsd_thread_deallocatedp_get(tsd) += old_usize;
	}
label_not_resized:
	if (unlikely(!tsd_fast(tsd))) {