Initial import
This commit is contained in:
Justine Tunney
412
third_party/duktape/duk_heap_memory.c
vendored
Normal file
412
third_party/duktape/duk_heap_memory.c
vendored
Normal file
@@ -0,0 +1,412 @@
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/*
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* Memory allocation handling.
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*/
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#include "third_party/duktape/duk_internal.h"
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/*
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* Allocate memory with garbage collection.
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*/
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/* Slow path: voluntary GC triggered, first alloc attempt failed, or zero size. */
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DUK_LOCAL DUK_NOINLINE_PERF DUK_COLD void *duk__heap_mem_alloc_slowpath(duk_heap *heap, duk_size_t size) {
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void *res;
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duk_small_int_t i;
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DUK_ASSERT(heap != NULL);
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DUK_ASSERT(heap->alloc_func != NULL);
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DUK_ASSERT_DISABLE(size >= 0);
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if (size == 0) {
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DUK_D(DUK_DPRINT("zero size alloc in slow path, return NULL"));
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return NULL;
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}
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DUK_D(DUK_DPRINT("first alloc attempt failed or voluntary GC limit reached, attempt to gc and retry"));
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#if 0
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/*
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* If GC is already running there is no point in attempting a GC
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* because it will be skipped. This could be checked for explicitly,
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* but it isn't actually needed: the loop below will eventually
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* fail resulting in a NULL.
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*/
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if (heap->ms_prevent_count != 0) {
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DUK_D(DUK_DPRINT("duk_heap_mem_alloc() failed, gc in progress (gc skipped), alloc size %ld", (long) size));
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return NULL;
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}
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#endif
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/*
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* Retry with several GC attempts. Initial attempts are made without
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* emergency mode; later attempts use emergency mode which minimizes
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* memory allocations forcibly.
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*/
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for (i = 0; i < DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_LIMIT; i++) {
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duk_small_uint_t flags;
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flags = 0;
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if (i >= DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_EMERGENCY_LIMIT - 1) {
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flags |= DUK_MS_FLAG_EMERGENCY;
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}
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duk_heap_mark_and_sweep(heap, flags);
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DUK_ASSERT(size > 0);
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res = heap->alloc_func(heap->heap_udata, size);
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if (res != NULL) {
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DUK_D(DUK_DPRINT("duk_heap_mem_alloc() succeeded after gc (pass %ld), alloc size %ld",
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(long) (i + 1), (long) size));
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return res;
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}
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}
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DUK_D(DUK_DPRINT("duk_heap_mem_alloc() failed even after gc, alloc size %ld", (long) size));
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return NULL;
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}
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DUK_INTERNAL DUK_INLINE_PERF DUK_HOT void *duk_heap_mem_alloc(duk_heap *heap, duk_size_t size) {
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void *res;
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DUK_ASSERT(heap != NULL);
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DUK_ASSERT(heap->alloc_func != NULL);
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DUK_ASSERT_DISABLE(size >= 0);
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#if defined(DUK_USE_VOLUNTARY_GC)
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/* Voluntary periodic GC (if enabled). */
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if (DUK_UNLIKELY(--(heap)->ms_trigger_counter < 0)) {
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goto slowpath;
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}
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#endif
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#if defined(DUK_USE_GC_TORTURE)
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/* Simulate alloc failure on every alloc, except when mark-and-sweep
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* is running.
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*/
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if (heap->ms_prevent_count == 0) {
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DUK_DDD(DUK_DDDPRINT("gc torture enabled, pretend that first alloc attempt fails"));
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res = NULL;
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DUK_UNREF(res);
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goto slowpath;
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}
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#endif
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/* Zero-size allocation should happen very rarely (if at all), so
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* don't check zero size on NULL; handle it in the slow path
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* instead. This reduces size of inlined code.
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*/
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res = heap->alloc_func(heap->heap_udata, size);
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if (DUK_LIKELY(res != NULL)) {
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return res;
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}
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slowpath:
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if (size == 0) {
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DUK_D(DUK_DPRINT("first alloc attempt returned NULL for zero size alloc, use slow path to deal with it"));
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} else {
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DUK_D(DUK_DPRINT("first alloc attempt failed, attempt to gc and retry"));
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}
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return duk__heap_mem_alloc_slowpath(heap, size);
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}
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DUK_INTERNAL DUK_INLINE_PERF DUK_HOT void *duk_heap_mem_alloc_zeroed(duk_heap *heap, duk_size_t size) {
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void *res;
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DUK_ASSERT(heap != NULL);
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DUK_ASSERT(heap->alloc_func != NULL);
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DUK_ASSERT_DISABLE(size >= 0);
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res = DUK_ALLOC(heap, size);
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if (DUK_LIKELY(res != NULL)) {
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duk_memzero(res, size);
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}
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return res;
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}
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DUK_INTERNAL DUK_INLINE_PERF DUK_HOT void *duk_heap_mem_alloc_checked(duk_hthread *thr, duk_size_t size) {
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void *res;
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DUK_ASSERT(thr != NULL);
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DUK_ASSERT(thr->heap != NULL);
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DUK_ASSERT(thr->heap->alloc_func != NULL);
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res = duk_heap_mem_alloc(thr->heap, size);
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if (DUK_LIKELY(res != NULL)) {
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return res;
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} else if (size == 0) {
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DUK_ASSERT(res == NULL);
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return res;
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}
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DUK_ERROR_ALLOC_FAILED(thr);
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DUK_WO_NORETURN(return NULL;);
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}
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DUK_INTERNAL DUK_INLINE_PERF DUK_HOT void *duk_heap_mem_alloc_checked_zeroed(duk_hthread *thr, duk_size_t size) {
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void *res;
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DUK_ASSERT(thr != NULL);
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DUK_ASSERT(thr->heap != NULL);
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DUK_ASSERT(thr->heap->alloc_func != NULL);
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res = duk_heap_mem_alloc(thr->heap, size);
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if (DUK_LIKELY(res != NULL)) {
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duk_memzero(res, size);
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return res;
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} else if (size == 0) {
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DUK_ASSERT(res == NULL);
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return res;
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}
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DUK_ERROR_ALLOC_FAILED(thr);
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DUK_WO_NORETURN(return NULL;);
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}
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/*
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* Reallocate memory with garbage collection.
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*/
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/* Slow path: voluntary GC triggered, first realloc attempt failed, or zero size. */
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DUK_LOCAL DUK_NOINLINE_PERF DUK_COLD void *duk__heap_mem_realloc_slowpath(duk_heap *heap, void *ptr, duk_size_t newsize) {
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void *res;
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duk_small_int_t i;
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DUK_ASSERT(heap != NULL);
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DUK_ASSERT(heap->realloc_func != NULL);
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/* ptr may be NULL */
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DUK_ASSERT_DISABLE(newsize >= 0);
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/* Newsize was 0 and realloc() returned NULL, this has the semantics
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* of free(oldptr), i.e. memory was successfully freed.
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*/
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if (newsize == 0) {
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DUK_D(DUK_DPRINT("zero size realloc in slow path, return NULL"));
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return NULL;
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}
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DUK_D(DUK_DPRINT("first realloc attempt failed, attempt to gc and retry"));
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#if 0
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/*
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* Avoid a GC if GC is already running. See duk_heap_mem_alloc().
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*/
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if (heap->ms_prevent_count != 0) {
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DUK_D(DUK_DPRINT("duk_heap_mem_realloc() failed, gc in progress (gc skipped), alloc size %ld", (long) newsize));
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return NULL;
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}
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#endif
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/*
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* Retry with several GC attempts. Initial attempts are made without
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* emergency mode; later attempts use emergency mode which minimizes
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* memory allocations forcibly.
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*/
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for (i = 0; i < DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_LIMIT; i++) {
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duk_small_uint_t flags;
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flags = 0;
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if (i >= DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_EMERGENCY_LIMIT - 1) {
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flags |= DUK_MS_FLAG_EMERGENCY;
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}
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duk_heap_mark_and_sweep(heap, flags);
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DUK_ASSERT(newsize > 0);
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res = heap->realloc_func(heap->heap_udata, ptr, newsize);
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if (res || newsize == 0) {
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DUK_D(DUK_DPRINT("duk_heap_mem_realloc() succeeded after gc (pass %ld), alloc size %ld",
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(long) (i + 1), (long) newsize));
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return res;
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}
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}
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DUK_D(DUK_DPRINT("duk_heap_mem_realloc() failed even after gc, alloc size %ld", (long) newsize));
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return NULL;
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}
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DUK_INTERNAL DUK_INLINE_PERF DUK_HOT void *duk_heap_mem_realloc(duk_heap *heap, void *ptr, duk_size_t newsize) {
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void *res;
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DUK_ASSERT(heap != NULL);
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DUK_ASSERT(heap->realloc_func != NULL);
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/* ptr may be NULL */
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DUK_ASSERT_DISABLE(newsize >= 0);
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#if defined(DUK_USE_VOLUNTARY_GC)
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/* Voluntary periodic GC (if enabled). */
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if (DUK_UNLIKELY(--(heap)->ms_trigger_counter < 0)) {
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goto slowpath;
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}
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#endif
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#if defined(DUK_USE_GC_TORTURE)
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/* Simulate alloc failure on every realloc, except when mark-and-sweep
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* is running.
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*/
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if (heap->ms_prevent_count == 0) {
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DUK_DDD(DUK_DDDPRINT("gc torture enabled, pretend that first realloc attempt fails"));
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res = NULL;
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DUK_UNREF(res);
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goto slowpath;
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}
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#endif
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res = heap->realloc_func(heap->heap_udata, ptr, newsize);
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if (DUK_LIKELY(res != NULL)) {
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return res;
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}
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slowpath:
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if (newsize == 0) {
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DUK_D(DUK_DPRINT("first realloc attempt returned NULL for zero size realloc, use slow path to deal with it"));
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} else {
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DUK_D(DUK_DPRINT("first realloc attempt failed, attempt to gc and retry"));
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}
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return duk__heap_mem_realloc_slowpath(heap, ptr, newsize);
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}
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/*
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* Reallocate memory with garbage collection, using a callback to provide
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* the current allocated pointer. This variant is used when a mark-and-sweep
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* (e.g. finalizers) might change the original pointer.
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*/
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/* Slow path: voluntary GC triggered, first realloc attempt failed, or zero size. */
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DUK_LOCAL DUK_NOINLINE_PERF DUK_COLD void *duk__heap_mem_realloc_indirect_slowpath(duk_heap *heap, duk_mem_getptr cb, void *ud, duk_size_t newsize) {
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void *res;
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duk_small_int_t i;
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DUK_ASSERT(heap != NULL);
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DUK_ASSERT(heap->realloc_func != NULL);
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DUK_ASSERT_DISABLE(newsize >= 0);
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if (newsize == 0) {
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DUK_D(DUK_DPRINT("zero size indirect realloc in slow path, return NULL"));
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return NULL;
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}
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DUK_D(DUK_DPRINT("first indirect realloc attempt failed, attempt to gc and retry"));
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#if 0
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/*
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* Avoid a GC if GC is already running. See duk_heap_mem_alloc().
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*/
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if (heap->ms_prevent_count != 0) {
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DUK_D(DUK_DPRINT("duk_heap_mem_realloc_indirect() failed, gc in progress (gc skipped), alloc size %ld", (long) newsize));
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return NULL;
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}
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#endif
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/*
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* Retry with several GC attempts. Initial attempts are made without
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* emergency mode; later attempts use emergency mode which minimizes
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* memory allocations forcibly.
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*/
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for (i = 0; i < DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_LIMIT; i++) {
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duk_small_uint_t flags;
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#if defined(DUK_USE_DEBUG)
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void *ptr_pre;
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void *ptr_post;
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#endif
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#if defined(DUK_USE_DEBUG)
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ptr_pre = cb(heap, ud);
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#endif
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flags = 0;
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if (i >= DUK_HEAP_ALLOC_FAIL_MARKANDSWEEP_EMERGENCY_LIMIT - 1) {
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flags |= DUK_MS_FLAG_EMERGENCY;
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}
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duk_heap_mark_and_sweep(heap, flags);
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#if defined(DUK_USE_DEBUG)
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ptr_post = cb(heap, ud);
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if (ptr_pre != ptr_post) {
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DUK_DD(DUK_DDPRINT("realloc base pointer changed by mark-and-sweep: %p -> %p",
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(void *) ptr_pre, (void *) ptr_post));
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}
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#endif
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/* Note: key issue here is to re-lookup the base pointer on every attempt.
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* The pointer being reallocated may change after every mark-and-sweep.
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*/
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DUK_ASSERT(newsize > 0);
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res = heap->realloc_func(heap->heap_udata, cb(heap, ud), newsize);
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if (res || newsize == 0) {
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DUK_D(DUK_DPRINT("duk_heap_mem_realloc_indirect() succeeded after gc (pass %ld), alloc size %ld",
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(long) (i + 1), (long) newsize));
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return res;
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}
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}
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DUK_D(DUK_DPRINT("duk_heap_mem_realloc_indirect() failed even after gc, alloc size %ld", (long) newsize));
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return NULL;
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}
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DUK_INTERNAL DUK_INLINE_PERF DUK_HOT void *duk_heap_mem_realloc_indirect(duk_heap *heap, duk_mem_getptr cb, void *ud, duk_size_t newsize) {
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void *res;
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DUK_ASSERT(heap != NULL);
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DUK_ASSERT(heap->realloc_func != NULL);
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DUK_ASSERT_DISABLE(newsize >= 0);
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#if defined(DUK_USE_VOLUNTARY_GC)
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/* Voluntary periodic GC (if enabled). */
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if (DUK_UNLIKELY(--(heap)->ms_trigger_counter < 0)) {
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goto slowpath;
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}
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#endif
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#if defined(DUK_USE_GC_TORTURE)
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/* Simulate alloc failure on every realloc, except when mark-and-sweep
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* is running.
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*/
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if (heap->ms_prevent_count == 0) {
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DUK_DDD(DUK_DDDPRINT("gc torture enabled, pretend that first indirect realloc attempt fails"));
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res = NULL;
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DUK_UNREF(res);
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goto slowpath;
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}
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#endif
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res = heap->realloc_func(heap->heap_udata, cb(heap, ud), newsize);
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if (DUK_LIKELY(res != NULL)) {
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return res;
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}
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slowpath:
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if (newsize == 0) {
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DUK_D(DUK_DPRINT("first indirect realloc attempt returned NULL for zero size realloc, use slow path to deal with it"));
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} else {
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DUK_D(DUK_DPRINT("first indirect realloc attempt failed, attempt to gc and retry"));
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}
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return duk__heap_mem_realloc_indirect_slowpath(heap, cb, ud, newsize);
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}
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/*
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* Free memory
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*/
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DUK_INTERNAL DUK_INLINE_PERF DUK_HOT void duk_heap_mem_free(duk_heap *heap, void *ptr) {
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DUK_ASSERT(heap != NULL);
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DUK_ASSERT(heap->free_func != NULL);
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/* ptr may be NULL */
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/* Must behave like a no-op with NULL and any pointer returned from
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* malloc/realloc with zero size.
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*/
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heap->free_func(heap->heap_udata, ptr);
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/* Never perform a GC (even voluntary) in a memory free, otherwise
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* all call sites doing frees would need to deal with the side effects.
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* No need to update voluntary GC counter either.
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*/
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}
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