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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /memory/volatile/VolatileBufferOSX.cpp | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'memory/volatile/VolatileBufferOSX.cpp')
-rw-r--r-- | memory/volatile/VolatileBufferOSX.cpp | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/memory/volatile/VolatileBufferOSX.cpp b/memory/volatile/VolatileBufferOSX.cpp new file mode 100644 index 0000000000..c6299d1db0 --- /dev/null +++ b/memory/volatile/VolatileBufferOSX.cpp @@ -0,0 +1,105 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "VolatileBuffer.h" +#include "mozilla/Assertions.h" +#include "mozilla/DebugOnly.h" +#include "mozilla/mozalloc.h" + +#include <mach/mach.h> +#include <sys/mman.h> +#include <unistd.h> + +#define MIN_VOLATILE_ALLOC_SIZE 8192 + +namespace mozilla { + +VolatileBuffer::VolatileBuffer() + : mMutex("VolatileBuffer"), + mBuf(nullptr), + mSize(0), + mLockCount(0), + mHeap(false) {} + +bool VolatileBuffer::Init(size_t aSize, size_t aAlignment) { + MOZ_ASSERT(!mSize && !mBuf, "Init called twice"); + MOZ_ASSERT(!(aAlignment % sizeof(void*)), + "Alignment must be multiple of pointer size"); + + mSize = aSize; + + kern_return_t ret = 0; + if (aSize < MIN_VOLATILE_ALLOC_SIZE) { + goto heap_alloc; + } + + ret = vm_allocate(mach_task_self(), (vm_address_t*)&mBuf, mSize, + VM_FLAGS_PURGABLE | VM_FLAGS_ANYWHERE); + if (ret == KERN_SUCCESS) { + return true; + } + +heap_alloc: + (void)posix_memalign(&mBuf, aAlignment, aSize); + mHeap = true; + return !!mBuf; +} + +VolatileBuffer::~VolatileBuffer() { + MOZ_ASSERT(mLockCount == 0, "Being destroyed with non-zero lock count?"); + + if (OnHeap()) { + free(mBuf); + } else { + vm_deallocate(mach_task_self(), (vm_address_t)mBuf, mSize); + } +} + +bool VolatileBuffer::Lock(void** aBuf) { + MutexAutoLock lock(mMutex); + + MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer"); + + *aBuf = mBuf; + if (++mLockCount > 1 || OnHeap()) { + return true; + } + + int state = VM_PURGABLE_NONVOLATILE; + kern_return_t ret = vm_purgable_control(mach_task_self(), (vm_address_t)mBuf, + VM_PURGABLE_SET_STATE, &state); + return ret == KERN_SUCCESS && !(state & VM_PURGABLE_EMPTY); +} + +void VolatileBuffer::Unlock() { + MutexAutoLock lock(mMutex); + + MOZ_ASSERT(mLockCount > 0, "VolatileBuffer unlocked too many times!"); + if (--mLockCount || OnHeap()) { + return; + } + + int state = VM_PURGABLE_VOLATILE | VM_VOLATILE_GROUP_DEFAULT; + DebugOnly<kern_return_t> ret = vm_purgable_control( + mach_task_self(), (vm_address_t)mBuf, VM_PURGABLE_SET_STATE, &state); + MOZ_ASSERT(ret == KERN_SUCCESS, "Failed to set buffer as purgable"); +} + +bool VolatileBuffer::OnHeap() const { return mHeap; } + +size_t VolatileBuffer::HeapSizeOfExcludingThis( + MallocSizeOf aMallocSizeOf) const { + return OnHeap() ? aMallocSizeOf(mBuf) : 0; +} + +size_t VolatileBuffer::NonHeapSizeOfExcludingThis() const { + if (OnHeap()) { + return 0; + } + + unsigned long pagemask = getpagesize() - 1; + return (mSize + pagemask) & ~pagemask; +} + +} // namespace mozilla |