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a62f08e050
Add SWIFT_DEBUG_ENABLE_TASK_SLAB_ALLOCATOR, which is on by default. When turned off, async stack allocations call through to malloc/free. This allows memory debugging tools to be used on async stack allocations.
92 lines
2.5 KiB
C++
92 lines
2.5 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 <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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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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void *swift::swift_job_allocate(Job *job, size_t size) {
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if (!job->isAsyncTask())
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return nullptr;
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return allocator(static_cast<AsyncTask *>(job)).alloc(size);
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}
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void swift::swift_job_deallocate(Job *job, void *ptr) {
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if (!job->isAsyncTask())
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return;
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allocator(static_cast<AsyncTask *>(job)).dealloc(ptr);
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}
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#if !SWIFT_CONCURRENCY_EMBEDDED
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std::atomic<TaskAllocatorConfiguration::EnableState>
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TaskAllocatorConfiguration::enableState = {EnableState::Uninitialized};
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#endif
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