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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /memory/volatile/VolatileBufferOSX.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'memory/volatile/VolatileBufferOSX.cpp')
-rw-r--r--memory/volatile/VolatileBufferOSX.cpp129
1 files changed, 129 insertions, 0 deletions
diff --git a/memory/volatile/VolatileBufferOSX.cpp b/memory/volatile/VolatileBufferOSX.cpp
new file mode 100644
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+++ b/memory/volatile/VolatileBufferOSX.cpp
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+/* 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)moz_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