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Diffstat (limited to 'third_party/abseil_cpp/absl/base/internal/low_level_alloc.cc')
| -rw-r--r-- | third_party/abseil_cpp/absl/base/internal/low_level_alloc.cc | 620 |
1 files changed, 0 insertions, 620 deletions
diff --git a/third_party/abseil_cpp/absl/base/internal/low_level_alloc.cc b/third_party/abseil_cpp/absl/base/internal/low_level_alloc.cc deleted file mode 100644 index 1bf94438d6..0000000000 --- a/third_party/abseil_cpp/absl/base/internal/low_level_alloc.cc +++ /dev/null @@ -1,620 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// A low-level allocator that can be used by other low-level -// modules without introducing dependency cycles. -// This allocator is slow and wasteful of memory; -// it should not be used when performance is key. - -#include "absl/base/internal/low_level_alloc.h" - -#include <type_traits> - -#include "absl/base/call_once.h" -#include "absl/base/config.h" -#include "absl/base/internal/direct_mmap.h" -#include "absl/base/internal/scheduling_mode.h" -#include "absl/base/macros.h" -#include "absl/base/thread_annotations.h" - -// LowLevelAlloc requires that the platform support low-level -// allocation of virtual memory. Platforms lacking this cannot use -// LowLevelAlloc. -#ifndef ABSL_LOW_LEVEL_ALLOC_MISSING - -#ifndef _WIN32 -#include <pthread.h> -#include <signal.h> -#include <sys/mman.h> -#include <unistd.h> -#else -#include <windows.h> -#endif - -#include <string.h> -#include <algorithm> -#include <atomic> -#include <cerrno> -#include <cstddef> -#include <new> // for placement-new - -#include "absl/base/dynamic_annotations.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/base/internal/spinlock.h" - -// MAP_ANONYMOUS -#if defined(__APPLE__) -// For mmap, Linux defines both MAP_ANONYMOUS and MAP_ANON and says MAP_ANON is -// deprecated. In Darwin, MAP_ANON is all there is. -#if !defined MAP_ANONYMOUS -#define MAP_ANONYMOUS MAP_ANON -#endif // !MAP_ANONYMOUS -#endif // __APPLE__ - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace base_internal { - -// A first-fit allocator with amortized logarithmic free() time. - -// --------------------------------------------------------------------------- -static const int kMaxLevel = 30; - -namespace { -// This struct describes one allocated block, or one free block. -struct AllocList { - struct Header { - // Size of entire region, including this field. Must be - // first. Valid in both allocated and unallocated blocks. - uintptr_t size; - - // kMagicAllocated or kMagicUnallocated xor this. - uintptr_t magic; - - // Pointer to parent arena. - LowLevelAlloc::Arena *arena; - - // Aligns regions to 0 mod 2*sizeof(void*). - void *dummy_for_alignment; - } header; - - // Next two fields: in unallocated blocks: freelist skiplist data - // in allocated blocks: overlaps with client data - - // Levels in skiplist used. - int levels; - - // Actually has levels elements. The AllocList node may not have room - // for all kMaxLevel entries. See max_fit in LLA_SkiplistLevels(). - AllocList *next[kMaxLevel]; -}; -} // namespace - -// --------------------------------------------------------------------------- -// A trivial skiplist implementation. This is used to keep the freelist -// in address order while taking only logarithmic time per insert and delete. - -// An integer approximation of log2(size/base) -// Requires size >= base. -static int IntLog2(size_t size, size_t base) { - int result = 0; - for (size_t i = size; i > base; i >>= 1) { // i == floor(size/2**result) - result++; - } - // floor(size / 2**result) <= base < floor(size / 2**(result-1)) - // => log2(size/(base+1)) <= result < 1+log2(size/base) - // => result ~= log2(size/base) - return result; -} - -// Return a random integer n: p(n)=1/(2**n) if 1 <= n; p(n)=0 if n < 1. -static int Random(uint32_t *state) { - uint32_t r = *state; - int result = 1; - while ((((r = r*1103515245 + 12345) >> 30) & 1) == 0) { - result++; - } - *state = r; - return result; -} - -// Return a number of skiplist levels for a node of size bytes, where -// base is the minimum node size. Compute level=log2(size / base)+n -// where n is 1 if random is false and otherwise a random number generated with -// the standard distribution for a skiplist: See Random() above. -// Bigger nodes tend to have more skiplist levels due to the log2(size / base) -// term, so first-fit searches touch fewer nodes. "level" is clipped so -// level<kMaxLevel and next[level-1] will fit in the node. -// 0 < LLA_SkiplistLevels(x,y,false) <= LLA_SkiplistLevels(x,y,true) < kMaxLevel -static int LLA_SkiplistLevels(size_t size, size_t base, uint32_t *random) { - // max_fit is the maximum number of levels that will fit in a node for the - // given size. We can't return more than max_fit, no matter what the - // random number generator says. - size_t max_fit = (size - offsetof(AllocList, next)) / sizeof(AllocList *); - int level = IntLog2(size, base) + (random != nullptr ? Random(random) : 1); - if (static_cast<size_t>(level) > max_fit) level = static_cast<int>(max_fit); - if (level > kMaxLevel-1) level = kMaxLevel - 1; - ABSL_RAW_CHECK(level >= 1, "block not big enough for even one level"); - return level; -} - -// Return "atleast", the first element of AllocList *head s.t. *atleast >= *e. -// For 0 <= i < head->levels, set prev[i] to "no_greater", where no_greater -// points to the last element at level i in the AllocList less than *e, or is -// head if no such element exists. -static AllocList *LLA_SkiplistSearch(AllocList *head, - AllocList *e, AllocList **prev) { - AllocList *p = head; - for (int level = head->levels - 1; level >= 0; level--) { - for (AllocList *n; (n = p->next[level]) != nullptr && n < e; p = n) { - } - prev[level] = p; - } - return (head->levels == 0) ? nullptr : prev[0]->next[0]; -} - -// Insert element *e into AllocList *head. Set prev[] as LLA_SkiplistSearch. -// Requires that e->levels be previously set by the caller (using -// LLA_SkiplistLevels()) -static void LLA_SkiplistInsert(AllocList *head, AllocList *e, - AllocList **prev) { - LLA_SkiplistSearch(head, e, prev); - for (; head->levels < e->levels; head->levels++) { // extend prev pointers - prev[head->levels] = head; // to all *e's levels - } - for (int i = 0; i != e->levels; i++) { // add element to list - e->next[i] = prev[i]->next[i]; - prev[i]->next[i] = e; - } -} - -// Remove element *e from AllocList *head. Set prev[] as LLA_SkiplistSearch(). -// Requires that e->levels be previous set by the caller (using -// LLA_SkiplistLevels()) -static void LLA_SkiplistDelete(AllocList *head, AllocList *e, - AllocList **prev) { - AllocList *found = LLA_SkiplistSearch(head, e, prev); - ABSL_RAW_CHECK(e == found, "element not in freelist"); - for (int i = 0; i != e->levels && prev[i]->next[i] == e; i++) { - prev[i]->next[i] = e->next[i]; - } - while (head->levels > 0 && head->next[head->levels - 1] == nullptr) { - head->levels--; // reduce head->levels if level unused - } -} - -// --------------------------------------------------------------------------- -// Arena implementation - -// Metadata for an LowLevelAlloc arena instance. -struct LowLevelAlloc::Arena { - // Constructs an arena with the given LowLevelAlloc flags. - explicit Arena(uint32_t flags_value); - - base_internal::SpinLock mu; - // Head of free list, sorted by address - AllocList freelist ABSL_GUARDED_BY(mu); - // Count of allocated blocks - int32_t allocation_count ABSL_GUARDED_BY(mu); - // flags passed to NewArena - const uint32_t flags; - // Result of sysconf(_SC_PAGESIZE) - const size_t pagesize; - // Lowest power of two >= max(16, sizeof(AllocList)) - const size_t round_up; - // Smallest allocation block size - const size_t min_size; - // PRNG state - uint32_t random ABSL_GUARDED_BY(mu); -}; - -namespace { -// Static storage space for the lazily-constructed, default global arena -// instances. We require this space because the whole point of LowLevelAlloc -// is to avoid relying on malloc/new. -alignas(LowLevelAlloc::Arena) unsigned char default_arena_storage[sizeof( - LowLevelAlloc::Arena)]; -alignas(LowLevelAlloc::Arena) unsigned char unhooked_arena_storage[sizeof( - LowLevelAlloc::Arena)]; -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING -alignas( - LowLevelAlloc::Arena) unsigned char unhooked_async_sig_safe_arena_storage - [sizeof(LowLevelAlloc::Arena)]; -#endif - -// We must use LowLevelCallOnce here to construct the global arenas, rather than -// using function-level statics, to avoid recursively invoking the scheduler. -absl::once_flag create_globals_once; - -void CreateGlobalArenas() { - new (&default_arena_storage) - LowLevelAlloc::Arena(LowLevelAlloc::kCallMallocHook); - new (&unhooked_arena_storage) LowLevelAlloc::Arena(0); -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - new (&unhooked_async_sig_safe_arena_storage) - LowLevelAlloc::Arena(LowLevelAlloc::kAsyncSignalSafe); -#endif -} - -// Returns a global arena that does not call into hooks. Used by NewArena() -// when kCallMallocHook is not set. -LowLevelAlloc::Arena* UnhookedArena() { - base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas); - return reinterpret_cast<LowLevelAlloc::Arena*>(&unhooked_arena_storage); -} - -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING -// Returns a global arena that is async-signal safe. Used by NewArena() when -// kAsyncSignalSafe is set. -LowLevelAlloc::Arena *UnhookedAsyncSigSafeArena() { - base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas); - return reinterpret_cast<LowLevelAlloc::Arena *>( - &unhooked_async_sig_safe_arena_storage); -} -#endif - -} // namespace - -// Returns the default arena, as used by LowLevelAlloc::Alloc() and friends. -LowLevelAlloc::Arena *LowLevelAlloc::DefaultArena() { - base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas); - return reinterpret_cast<LowLevelAlloc::Arena*>(&default_arena_storage); -} - -// magic numbers to identify allocated and unallocated blocks -static const uintptr_t kMagicAllocated = 0x4c833e95U; -static const uintptr_t kMagicUnallocated = ~kMagicAllocated; - -namespace { -class ABSL_SCOPED_LOCKABLE ArenaLock { - public: - explicit ArenaLock(LowLevelAlloc::Arena *arena) - ABSL_EXCLUSIVE_LOCK_FUNCTION(arena->mu) - : arena_(arena) { -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) != 0) { - sigset_t all; - sigfillset(&all); - mask_valid_ = pthread_sigmask(SIG_BLOCK, &all, &mask_) == 0; - } -#endif - arena_->mu.Lock(); - } - ~ArenaLock() { ABSL_RAW_CHECK(left_, "haven't left Arena region"); } - void Leave() ABSL_UNLOCK_FUNCTION() { - arena_->mu.Unlock(); -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - if (mask_valid_) { - const int err = pthread_sigmask(SIG_SETMASK, &mask_, nullptr); - if (err != 0) { - ABSL_RAW_LOG(FATAL, "pthread_sigmask failed: %d", err); - } - } -#endif - left_ = true; - } - - private: - bool left_ = false; // whether left region -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - bool mask_valid_ = false; - sigset_t mask_; // old mask of blocked signals -#endif - LowLevelAlloc::Arena *arena_; - ArenaLock(const ArenaLock &) = delete; - ArenaLock &operator=(const ArenaLock &) = delete; -}; -} // namespace - -// create an appropriate magic number for an object at "ptr" -// "magic" should be kMagicAllocated or kMagicUnallocated -inline static uintptr_t Magic(uintptr_t magic, AllocList::Header *ptr) { - return magic ^ reinterpret_cast<uintptr_t>(ptr); -} - -namespace { -size_t GetPageSize() { -#ifdef _WIN32 - SYSTEM_INFO system_info; - GetSystemInfo(&system_info); - return std::max(system_info.dwPageSize, system_info.dwAllocationGranularity); -#elif defined(__wasm__) || defined(__asmjs__) - return getpagesize(); -#else - return sysconf(_SC_PAGESIZE); -#endif -} - -size_t RoundedUpBlockSize() { - // Round up block sizes to a power of two close to the header size. - size_t round_up = 16; - while (round_up < sizeof(AllocList::Header)) { - round_up += round_up; - } - return round_up; -} - -} // namespace - -LowLevelAlloc::Arena::Arena(uint32_t flags_value) - : mu(base_internal::SCHEDULE_KERNEL_ONLY), - allocation_count(0), - flags(flags_value), - pagesize(GetPageSize()), - round_up(RoundedUpBlockSize()), - min_size(2 * round_up), - random(0) { - freelist.header.size = 0; - freelist.header.magic = - Magic(kMagicUnallocated, &freelist.header); - freelist.header.arena = this; - freelist.levels = 0; - memset(freelist.next, 0, sizeof(freelist.next)); -} - -// L < meta_data_arena->mu -LowLevelAlloc::Arena *LowLevelAlloc::NewArena(int32_t flags) { - Arena *meta_data_arena = DefaultArena(); -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - if ((flags & LowLevelAlloc::kAsyncSignalSafe) != 0) { - meta_data_arena = UnhookedAsyncSigSafeArena(); - } else // NOLINT(readability/braces) -#endif - if ((flags & LowLevelAlloc::kCallMallocHook) == 0) { - meta_data_arena = UnhookedArena(); - } - Arena *result = - new (AllocWithArena(sizeof (*result), meta_data_arena)) Arena(flags); - return result; -} - -// L < arena->mu, L < arena->arena->mu -bool LowLevelAlloc::DeleteArena(Arena *arena) { - ABSL_RAW_CHECK( - arena != nullptr && arena != DefaultArena() && arena != UnhookedArena(), - "may not delete default arena"); - ArenaLock section(arena); - if (arena->allocation_count != 0) { - section.Leave(); - return false; - } - while (arena->freelist.next[0] != nullptr) { - AllocList *region = arena->freelist.next[0]; - size_t size = region->header.size; - arena->freelist.next[0] = region->next[0]; - ABSL_RAW_CHECK( - region->header.magic == Magic(kMagicUnallocated, ®ion->header), - "bad magic number in DeleteArena()"); - ABSL_RAW_CHECK(region->header.arena == arena, - "bad arena pointer in DeleteArena()"); - ABSL_RAW_CHECK(size % arena->pagesize == 0, - "empty arena has non-page-aligned block size"); - ABSL_RAW_CHECK(reinterpret_cast<uintptr_t>(region) % arena->pagesize == 0, - "empty arena has non-page-aligned block"); - int munmap_result; -#ifdef _WIN32 - munmap_result = VirtualFree(region, 0, MEM_RELEASE); - ABSL_RAW_CHECK(munmap_result != 0, - "LowLevelAlloc::DeleteArena: VitualFree failed"); -#else -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) == 0) { - munmap_result = munmap(region, size); - } else { - munmap_result = base_internal::DirectMunmap(region, size); - } -#else - munmap_result = munmap(region, size); -#endif // ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - if (munmap_result != 0) { - ABSL_RAW_LOG(FATAL, "LowLevelAlloc::DeleteArena: munmap failed: %d", - errno); - } -#endif // _WIN32 - } - section.Leave(); - arena->~Arena(); - Free(arena); - return true; -} - -// --------------------------------------------------------------------------- - -// Addition, checking for overflow. The intent is to die if an external client -// manages to push through a request that would cause arithmetic to fail. -static inline uintptr_t CheckedAdd(uintptr_t a, uintptr_t b) { - uintptr_t sum = a + b; - ABSL_RAW_CHECK(sum >= a, "LowLevelAlloc arithmetic overflow"); - return sum; -} - -// Return value rounded up to next multiple of align. -// align must be a power of two. -static inline uintptr_t RoundUp(uintptr_t addr, uintptr_t align) { - return CheckedAdd(addr, align - 1) & ~(align - 1); -} - -// Equivalent to "return prev->next[i]" but with sanity checking -// that the freelist is in the correct order, that it -// consists of regions marked "unallocated", and that no two regions -// are adjacent in memory (they should have been coalesced). -// L >= arena->mu -static AllocList *Next(int i, AllocList *prev, LowLevelAlloc::Arena *arena) { - ABSL_RAW_CHECK(i < prev->levels, "too few levels in Next()"); - AllocList *next = prev->next[i]; - if (next != nullptr) { - ABSL_RAW_CHECK( - next->header.magic == Magic(kMagicUnallocated, &next->header), - "bad magic number in Next()"); - ABSL_RAW_CHECK(next->header.arena == arena, "bad arena pointer in Next()"); - if (prev != &arena->freelist) { - ABSL_RAW_CHECK(prev < next, "unordered freelist"); - ABSL_RAW_CHECK(reinterpret_cast<char *>(prev) + prev->header.size < - reinterpret_cast<char *>(next), - "malformed freelist"); - } - } - return next; -} - -// Coalesce list item "a" with its successor if they are adjacent. -static void Coalesce(AllocList *a) { - AllocList *n = a->next[0]; - if (n != nullptr && reinterpret_cast<char *>(a) + a->header.size == - reinterpret_cast<char *>(n)) { - LowLevelAlloc::Arena *arena = a->header.arena; - a->header.size += n->header.size; - n->header.magic = 0; - n->header.arena = nullptr; - AllocList *prev[kMaxLevel]; - LLA_SkiplistDelete(&arena->freelist, n, prev); - LLA_SkiplistDelete(&arena->freelist, a, prev); - a->levels = LLA_SkiplistLevels(a->header.size, arena->min_size, - &arena->random); - LLA_SkiplistInsert(&arena->freelist, a, prev); - } -} - -// Adds block at location "v" to the free list -// L >= arena->mu -static void AddToFreelist(void *v, LowLevelAlloc::Arena *arena) { - AllocList *f = reinterpret_cast<AllocList *>( - reinterpret_cast<char *>(v) - sizeof (f->header)); - ABSL_RAW_CHECK(f->header.magic == Magic(kMagicAllocated, &f->header), - "bad magic number in AddToFreelist()"); - ABSL_RAW_CHECK(f->header.arena == arena, - "bad arena pointer in AddToFreelist()"); - f->levels = LLA_SkiplistLevels(f->header.size, arena->min_size, - &arena->random); - AllocList *prev[kMaxLevel]; - LLA_SkiplistInsert(&arena->freelist, f, prev); - f->header.magic = Magic(kMagicUnallocated, &f->header); - Coalesce(f); // maybe coalesce with successor - Coalesce(prev[0]); // maybe coalesce with predecessor -} - -// Frees storage allocated by LowLevelAlloc::Alloc(). -// L < arena->mu -void LowLevelAlloc::Free(void *v) { - if (v != nullptr) { - AllocList *f = reinterpret_cast<AllocList *>( - reinterpret_cast<char *>(v) - sizeof (f->header)); - LowLevelAlloc::Arena *arena = f->header.arena; - ArenaLock section(arena); - AddToFreelist(v, arena); - ABSL_RAW_CHECK(arena->allocation_count > 0, "nothing in arena to free"); - arena->allocation_count--; - section.Leave(); - } -} - -// allocates and returns a block of size bytes, to be freed with Free() -// L < arena->mu -static void *DoAllocWithArena(size_t request, LowLevelAlloc::Arena *arena) { - void *result = nullptr; - if (request != 0) { - AllocList *s; // will point to region that satisfies request - ArenaLock section(arena); - // round up with header - size_t req_rnd = RoundUp(CheckedAdd(request, sizeof (s->header)), - arena->round_up); - for (;;) { // loop until we find a suitable region - // find the minimum levels that a block of this size must have - int i = LLA_SkiplistLevels(req_rnd, arena->min_size, nullptr) - 1; - if (i < arena->freelist.levels) { // potential blocks exist - AllocList *before = &arena->freelist; // predecessor of s - while ((s = Next(i, before, arena)) != nullptr && - s->header.size < req_rnd) { - before = s; - } - if (s != nullptr) { // we found a region - break; - } - } - // we unlock before mmap() both because mmap() may call a callback hook, - // and because it may be slow. - arena->mu.Unlock(); - // mmap generous 64K chunks to decrease - // the chances/impact of fragmentation: - size_t new_pages_size = RoundUp(req_rnd, arena->pagesize * 16); - void *new_pages; -#ifdef _WIN32 - new_pages = VirtualAlloc(0, new_pages_size, - MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE); - ABSL_RAW_CHECK(new_pages != nullptr, "VirtualAlloc failed"); -#else -#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) != 0) { - new_pages = base_internal::DirectMmap(nullptr, new_pages_size, - PROT_WRITE|PROT_READ, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); - } else { - new_pages = mmap(nullptr, new_pages_size, PROT_WRITE | PROT_READ, - MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); - } -#else - new_pages = mmap(nullptr, new_pages_size, PROT_WRITE | PROT_READ, - MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); -#endif // ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING - if (new_pages == MAP_FAILED) { - ABSL_RAW_LOG(FATAL, "mmap error: %d", errno); - } - -#endif // _WIN32 - arena->mu.Lock(); - s = reinterpret_cast<AllocList *>(new_pages); - s->header.size = new_pages_size; - // Pretend the block is allocated; call AddToFreelist() to free it. - s->header.magic = Magic(kMagicAllocated, &s->header); - s->header.arena = arena; - AddToFreelist(&s->levels, arena); // insert new region into free list - } - AllocList *prev[kMaxLevel]; - LLA_SkiplistDelete(&arena->freelist, s, prev); // remove from free list - // s points to the first free region that's big enough - if (CheckedAdd(req_rnd, arena->min_size) <= s->header.size) { - // big enough to split - AllocList *n = reinterpret_cast<AllocList *> - (req_rnd + reinterpret_cast<char *>(s)); - n->header.size = s->header.size - req_rnd; - n->header.magic = Magic(kMagicAllocated, &n->header); - n->header.arena = arena; - s->header.size = req_rnd; - AddToFreelist(&n->levels, arena); - } - s->header.magic = Magic(kMagicAllocated, &s->header); - ABSL_RAW_CHECK(s->header.arena == arena, ""); - arena->allocation_count++; - section.Leave(); - result = &s->levels; - } - ANNOTATE_MEMORY_IS_UNINITIALIZED(result, request); - return result; -} - -void *LowLevelAlloc::Alloc(size_t request) { - void *result = DoAllocWithArena(request, DefaultArena()); - return result; -} - -void *LowLevelAlloc::AllocWithArena(size_t request, Arena *arena) { - ABSL_RAW_CHECK(arena != nullptr, "must pass a valid arena"); - void *result = DoAllocWithArena(request, arena); - return result; -} - -} // namespace base_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_LOW_LEVEL_ALLOC_MISSING |