libcxx/src/memory_resource.cpp

32 static bool is_aligned_to(void* ptr, size_t align) {
35   void* result = std::align(align, 1, p2, space);
41   void* do_allocate(size_t bytes, size_t align) override {
43     return std::__libcpp_allocate(bytes, align);
47     void* result = std::__libcpp_allocate(bytes, align);
48     if (!is_aligned_to(result, align)) {
49       std::__libcpp_deallocate(result, bytes, align);
56   void do_deallocate(void* p, size_t bytes, size_t align) override { std::__libcpp_deallocate(p, bytes, align); }
157 void* unsynchronized_pool_resource::__adhoc_pool::__do_allocate(memory_resource* upstream, size_t bytes, size_t align) {
161   if (align < footer_align)
162     align = footer_align;
166   void* result = upstream->allocate(aligned_capacity, align);
171   h->__align_       = align;
177     memory_resource* upstream, void* p, size_t bytes, size_t align) {
278 int unsynchronized_pool_resource::__pool_index(size_t bytes, size_t align) const {
279   if (align > alignof(std::max_align_t) || bytes > (size_t(1) << __num_fixed_pools_))
283     bytes = (bytes > align) ? bytes : align;
341 void* unsynchronized_pool_resource::do_allocate(size_t bytes, size_t align) {
350   int i = __pool_index(bytes, align);
352     return __adhoc_pool_.__do_allocate(__res_, bytes, align);
395 void unsynchronized_pool_resource::do_deallocate(void* p, size_t bytes, size_t align) {
400   int i = __pool_index(bytes, align);
402     return __adhoc_pool_.__do_deallocate(__res_, p, bytes, align);
413 static void* align_down(size_t align, size_t size, void*& ptr, size_t& space) {
418   char* new_ptr = reinterpret_cast<char*>(reinterpret_cast<uintptr_t>(p1 - size) & ~(align - 1));
429 void* monotonic_buffer_resource::__initial_descriptor::__try_allocate_from_chunk(size_t bytes, size_t align) {
434   void* aligned_ptr   = align_down(align, bytes, new_ptr, new_capacity);
440 void* monotonic_buffer_resource::__chunk_footer::__try_allocate_from_chunk(size_t bytes, size_t align) {
443   void* aligned_ptr   = align_down(align, bytes, new_ptr, new_capacity);
449 void* monotonic_buffer_resource::do_allocate(size_t bytes, size_t align) {
462   if (void* result = __initial_.__try_allocate_from_chunk(bytes, align))
465     if (void* result = __chunks_->__try_allocate_from_chunk(bytes, align))
471   if (align < footer_align)
472     align = footer_align;
482   char* start            = (char*)__res_->allocate(aligned_capacity, align);
488   footer->__align_       = align;
491   return __chunks_->__try_allocate_from_chunk(bytes, align);