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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /memory/volatile/VolatileBufferOSX.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'memory/volatile/VolatileBufferOSX.cpp')
-rw-r--r--memory/volatile/VolatileBufferOSX.cpp105
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