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120 lines
3.5 KiB
C++
120 lines
3.5 KiB
C++
//===--- TaskAlloc.cpp - Task-local stack allocator -----------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// A task-local allocator that obeys a stack discipline.
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//
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// Because allocation is task-local, and there's at most one thread
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// running a task at once, no synchronization is required.
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//
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//===----------------------------------------------------------------------===//
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#include "TaskPrivate.h"
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#include "swift/ABI/Task.h"
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#include "swift/Runtime/Concurrency.h"
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#include "swift/Runtime/Coro.h"
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#include <stdlib.h>
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using namespace swift;
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namespace {
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struct GlobalAllocator {
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TaskAllocator allocator;
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void *spaceForFirstSlab[64];
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GlobalAllocator() : allocator(spaceForFirstSlab, sizeof(spaceForFirstSlab)) {}
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};
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} // end anonymous namespace
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static TaskAllocator &allocator(AsyncTask *task) {
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if (task)
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return task->Private.get().Allocator;
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#if !SWIFT_CONCURRENCY_EMBEDDED
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// FIXME: this fall-back shouldn't be necessary, but it's useful
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// for now, since the current execution tests aren't setting up a task
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// properly.
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static GlobalAllocator global;
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return global.allocator;
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#else
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puts("global allocator fallback not available\n");
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abort();
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#endif
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}
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void *swift::swift_task_alloc(size_t size) {
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return allocator(swift_task_getCurrent()).alloc(size);
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}
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void *swift::_swift_task_alloc_specific(AsyncTask *task, size_t size) {
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return allocator(task).alloc(size);
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}
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void swift::swift_task_dealloc(void *ptr) {
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allocator(swift_task_getCurrent()).dealloc(ptr);
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}
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void swift::_swift_task_dealloc_specific(AsyncTask *task, void *ptr) {
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allocator(task).dealloc(ptr);
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}
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static void *swift_task_alloc_thunk(size_t size) {
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return swift_task_alloc(size);
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}
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static void swift_task_dealloc_thunk(void *ptr) { swift_task_dealloc(ptr); }
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void swift::swift_task_dealloc_through(void *ptr) {
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allocator(swift_task_getCurrent()).deallocThrough(ptr);
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}
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static CoroAllocator CoroTaskAllocatorImpl{
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CoroAllocatorFlags(/*CoroAllocatorKind::Async*/ 1), swift_task_alloc_thunk,
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swift_task_dealloc_thunk};
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CoroAllocator *const swift::_swift_coro_task_allocator = &CoroTaskAllocatorImpl;
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CoroAllocator *swift::swift_coro_getGlobalAllocator(CoroAllocatorFlags flags) {
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switch (flags.getKind()) {
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case CoroAllocatorKind::Stack:
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return nullptr;
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case CoroAllocatorKind::Async:
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return _swift_coro_task_allocator;
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case CoroAllocatorKind::Malloc:
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return _swift_coro_malloc_allocator;
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}
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}
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static CoroAllocator CoroMallocAllocatorImpl{
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CoroAllocatorFlags(/*CoroAllocatorKind::Malloc*/ 2), malloc, free};
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CoroAllocator *const swift::_swift_coro_malloc_allocator =
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&CoroMallocAllocatorImpl;
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void *swift::swift_coro_alloc(CoroAllocator *allocator, size_t size) {
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return allocator->allocate(size);
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}
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void swift::swift_coro_dealloc(CoroAllocator *allocator, void *ptr) {
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if (!allocator)
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return;
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// Calls to swift_coro_dealloc are emitted in resume funclets for every
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// live-across dynamic allocation. Whether such calls immediately deallocate
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// memory depends on the allocator.
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if (!allocator->shouldDeallocateImmediately()) {
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return;
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}
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allocator->deallocate(ptr);
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}
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