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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /ipc/glue/SharedMemoryBasic_mach.mm
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'ipc/glue/SharedMemoryBasic_mach.mm')
-rw-r--r--ipc/glue/SharedMemoryBasic_mach.mm167
1 files changed, 167 insertions, 0 deletions
diff --git a/ipc/glue/SharedMemoryBasic_mach.mm b/ipc/glue/SharedMemoryBasic_mach.mm
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+++ b/ipc/glue/SharedMemoryBasic_mach.mm
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* 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 <map>
+
+#include <mach/vm_map.h>
+#include <mach/mach_port.h>
+#if defined(XP_IOS)
+# include <mach/vm_map.h>
+# define mach_vm_address_t vm_address_t
+# define mach_vm_map vm_map
+# define mach_vm_read vm_read
+# define mach_vm_region_recurse vm_region_recurse_64
+# define mach_vm_size_t vm_size_t
+#else
+# include <mach/mach_vm.h>
+#endif
+#include <pthread.h>
+#include <unistd.h>
+#include "SharedMemoryBasic.h"
+
+#include "mozilla/IntegerPrintfMacros.h"
+#include "mozilla/Printf.h"
+#include "mozilla/StaticMutex.h"
+
+#ifdef DEBUG
+# define LOG_ERROR(str, args...) \
+ PR_BEGIN_MACRO \
+ mozilla::SmprintfPointer msg = mozilla::Smprintf(str, ##args); \
+ NS_WARNING(msg.get()); \
+ PR_END_MACRO
+#else
+# define LOG_ERROR(str, args...) \
+ do { /* nothing */ \
+ } while (0)
+#endif
+
+namespace mozilla {
+namespace ipc {
+
+SharedMemoryBasic::SharedMemoryBasic()
+ : mPort(MACH_PORT_NULL), mMemory(nullptr), mOpenRights(RightsReadWrite) {}
+
+SharedMemoryBasic::~SharedMemoryBasic() {
+ Unmap();
+ CloseHandle();
+}
+
+bool SharedMemoryBasic::SetHandle(Handle aHandle, OpenRights aRights) {
+ MOZ_ASSERT(mPort == MACH_PORT_NULL, "already initialized");
+
+ mPort = std::move(aHandle);
+ mOpenRights = aRights;
+ return true;
+}
+
+static inline void* toPointer(mach_vm_address_t address) {
+ return reinterpret_cast<void*>(static_cast<uintptr_t>(address));
+}
+
+static inline mach_vm_address_t toVMAddress(void* pointer) {
+ return static_cast<mach_vm_address_t>(reinterpret_cast<uintptr_t>(pointer));
+}
+
+bool SharedMemoryBasic::Create(size_t size) {
+ MOZ_ASSERT(mPort == MACH_PORT_NULL, "already initialized");
+
+ memory_object_size_t memoryObjectSize = round_page(size);
+
+ kern_return_t kr = mach_make_memory_entry_64(mach_task_self(), &memoryObjectSize, 0,
+ MAP_MEM_NAMED_CREATE | VM_PROT_DEFAULT,
+ getter_Transfers(mPort), MACH_PORT_NULL);
+ if (kr != KERN_SUCCESS || memoryObjectSize < round_page(size)) {
+ LOG_ERROR("Failed to make memory entry (%zu bytes). %s (%x)\n", size, mach_error_string(kr),
+ kr);
+ CloseHandle();
+ return false;
+ }
+
+ Created(size);
+ return true;
+}
+
+bool SharedMemoryBasic::Map(size_t size, void* fixed_address) {
+ MOZ_ASSERT(mMemory == nullptr);
+
+ if (MACH_PORT_NULL == mPort) {
+ return false;
+ }
+
+ kern_return_t kr;
+ mach_vm_address_t address = toVMAddress(fixed_address);
+
+ vm_prot_t vmProtection = VM_PROT_READ;
+ if (mOpenRights == RightsReadWrite) {
+ vmProtection |= VM_PROT_WRITE;
+ }
+
+ kr = mach_vm_map(mach_task_self(), &address, round_page(size), 0,
+ fixed_address ? VM_FLAGS_FIXED : VM_FLAGS_ANYWHERE, mPort.get(), 0, false,
+ vmProtection, vmProtection, VM_INHERIT_NONE);
+ if (kr != KERN_SUCCESS) {
+ if (!fixed_address) {
+ LOG_ERROR("Failed to map shared memory (%zu bytes) into %x, port %x. %s (%x)\n", size,
+ mach_task_self(), mach_port_t(mPort.get()), mach_error_string(kr), kr);
+ }
+ return false;
+ }
+
+ if (fixed_address && fixed_address != toPointer(address)) {
+ kr = vm_deallocate(mach_task_self(), address, size);
+ if (kr != KERN_SUCCESS) {
+ LOG_ERROR("Failed to unmap shared memory at unsuitable address "
+ "(%zu bytes) from %x, port %x. %s (%x)\n",
+ size, mach_task_self(), mach_port_t(mPort.get()), mach_error_string(kr), kr);
+ }
+ return false;
+ }
+
+ mMemory = toPointer(address);
+ Mapped(size);
+ return true;
+}
+
+void* SharedMemoryBasic::FindFreeAddressSpace(size_t size) {
+ mach_vm_address_t address = 0;
+ size = round_page(size);
+ if (mach_vm_map(mach_task_self(), &address, size, 0, VM_FLAGS_ANYWHERE, MEMORY_OBJECT_NULL, 0,
+ false, VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_NONE) != KERN_SUCCESS ||
+ vm_deallocate(mach_task_self(), address, size) != KERN_SUCCESS) {
+ return nullptr;
+ }
+ return toPointer(address);
+}
+
+auto SharedMemoryBasic::CloneHandle() -> Handle {
+ return mozilla::RetainMachSendRight(mPort.get());
+}
+
+void SharedMemoryBasic::Unmap() {
+ if (!mMemory) {
+ return;
+ }
+ vm_address_t address = toVMAddress(mMemory);
+ kern_return_t kr = vm_deallocate(mach_task_self(), address, round_page(mMappedSize));
+ if (kr != KERN_SUCCESS) {
+ LOG_ERROR("Failed to deallocate shared memory. %s (%x)\n", mach_error_string(kr), kr);
+ return;
+ }
+ mMemory = nullptr;
+}
+
+void SharedMemoryBasic::CloseHandle() {
+ if (mPort) {
+ mPort = nullptr;
+ mOpenRights = RightsReadWrite;
+ }
+}
+
+bool SharedMemoryBasic::IsHandleValid(const Handle& aHandle) const { return aHandle != nullptr; }
+
+} // namespace ipc
+} // namespace mozilla