| // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "vm/globals.h" |
| #if defined(TARGET_OS_FUCHSIA) |
| |
| #include "vm/virtual_memory.h" |
| |
| #include <magenta/syscalls.h> |
| #include <unistd.h> // NOLINT |
| |
| #include "platform/assert.h" |
| #include "vm/memory_region.h" |
| #include "vm/os.h" |
| |
| namespace dart { |
| |
| uword VirtualMemory::page_size_ = 0; |
| |
| |
| void VirtualMemory::InitOnce() { |
| page_size_ = getpagesize(); |
| } |
| |
| |
| VirtualMemory* VirtualMemory::ReserveInternal(intptr_t size) { |
| mx_handle_t vmo = MX_HANDLE_INVALID; |
| mx_status_t status = mx_vmo_create(size, 0u, &vmo); |
| if (status != NO_ERROR) { |
| return NULL; |
| } |
| |
| // TODO(zra): map with PERM_NONE, when that works, and relax with |
| // Commit and Protect when they are implemented. |
| // Issue MG-161. |
| const int prot = MX_VM_FLAG_PERM_READ | |
| MX_VM_FLAG_PERM_WRITE | |
| MX_VM_FLAG_PERM_EXECUTE; |
| uintptr_t addr; |
| status = mx_process_map_vm( |
| mx_process_self(), vmo, 0, size, &addr, prot); |
| if (status != NO_ERROR) { |
| mx_handle_close(vmo); |
| FATAL("VirtualMemory::ReserveInternal FAILED"); |
| return NULL; |
| } |
| |
| MemoryRegion region(reinterpret_cast<void*>(addr), size); |
| return new VirtualMemory(region, vmo); |
| } |
| |
| |
| VirtualMemory::~VirtualMemory() { |
| if (!embedder_allocated()) { |
| // TODO(zra): Use reserved_size_. |
| // Issue MG-162. |
| uintptr_t addr = reinterpret_cast<uintptr_t>(address()); |
| mx_status_t status = mx_process_unmap_vm( |
| mx_process_self(), addr, 0 /*reserved_size_*/); |
| if (status != NO_ERROR) { |
| FATAL("VirtualMemory::~VirtualMemory: unamp FAILED"); |
| } |
| |
| status = mx_handle_close(handle()); |
| if (status != NO_ERROR) { |
| FATAL("VirtualMemory::~VirtualMemory: handle_close FAILED"); |
| } |
| } |
| } |
| |
| |
| bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) { |
| // TODO(zra): It should be possible to free a subsegment after |
| // Issue MG-162 is addressed. |
| return false; |
| } |
| |
| |
| bool VirtualMemory::Commit(uword addr, intptr_t size, bool executable) { |
| // TODO(zra): Implement when the protections for a mapping can be changed. |
| // Issue MG-133. |
| return true; |
| } |
| |
| |
| bool VirtualMemory::Protect(void* address, intptr_t size, Protection mode) { |
| // TODO(zra): Implement when Fuchsia has an mprotect-like call. |
| return true; |
| } |
| |
| } // namespace dart |
| |
| #endif // defined(TARGET_OS_FUCHSIA) |