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main_repo / deps / v8 / src / platform-macos.cc @ f230a1cf
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// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Platform specific code for MacOS goes here. For the POSIX comaptible parts
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// the implementation is in platform-posix.cc.
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#include <dlfcn.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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#include <mach/mach_init.h> |
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#include <mach-o/dyld.h> |
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#include <mach-o/getsect.h> |
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#include <AvailabilityMacros.h> |
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#include <pthread.h> |
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#include <semaphore.h> |
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#include <signal.h> |
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#include <libkern/OSAtomic.h> |
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#include <mach/mach.h> |
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#include <mach/semaphore.h> |
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#include <mach/task.h> |
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#include <mach/vm_statistics.h> |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <sys/types.h> |
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#include <sys/sysctl.h> |
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#include <stdarg.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <errno.h> |
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#undef MAP_TYPE
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#include "v8.h" |
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#include "platform.h" |
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#include "simulator.h" |
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#include "vm-state-inl.h" |
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namespace v8 {
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namespace internal {
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// Constants used for mmap.
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// kMmapFd is used to pass vm_alloc flags to tag the region with the user
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// defined tag 255 This helps identify V8-allocated regions in memory analysis
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// tools like vmmap(1).
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static const int kMmapFd = VM_MAKE_TAG(255); |
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static const off_t kMmapFdOffset = 0; |
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void* OS::Allocate(const size_t requested, |
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size_t* allocated, |
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bool is_executable) {
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const size_t msize = RoundUp(requested, getpagesize());
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int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
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void* mbase = mmap(OS::GetRandomMmapAddr(),
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msize, |
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prot, |
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MAP_PRIVATE | MAP_ANON, |
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kMmapFd, |
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kMmapFdOffset); |
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if (mbase == MAP_FAILED) {
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LOG(Isolate::Current(), StringEvent("OS::Allocate", "mmap failed")); |
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return NULL; |
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} |
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*allocated = msize; |
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return mbase;
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} |
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class PosixMemoryMappedFile : public OS::MemoryMappedFile { |
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public:
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PosixMemoryMappedFile(FILE* file, void* memory, int size) |
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: file_(file), memory_(memory), size_(size) { } |
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virtual ~PosixMemoryMappedFile();
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virtual void* memory() { return memory_; } |
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virtual int size() { return size_; } |
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private:
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FILE* file_; |
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void* memory_;
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int size_;
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}; |
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OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { |
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FILE* file = fopen(name, "r+");
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if (file == NULL) return NULL; |
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fseek(file, 0, SEEK_END);
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int size = ftell(file);
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void* memory =
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mmap(OS::GetRandomMmapAddr(), |
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size, |
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PROT_READ | PROT_WRITE, |
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MAP_SHARED, |
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fileno(file), |
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0);
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return new PosixMemoryMappedFile(file, memory, size); |
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} |
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OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, |
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void* initial) {
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FILE* file = fopen(name, "w+");
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if (file == NULL) return NULL; |
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int result = fwrite(initial, size, 1, file); |
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if (result < 1) { |
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fclose(file); |
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return NULL; |
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} |
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void* memory =
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mmap(OS::GetRandomMmapAddr(), |
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size, |
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PROT_READ | PROT_WRITE, |
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MAP_SHARED, |
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fileno(file), |
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0);
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return new PosixMemoryMappedFile(file, memory, size); |
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} |
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PosixMemoryMappedFile::~PosixMemoryMappedFile() { |
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if (memory_) OS::Free(memory_, size_);
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fclose(file_); |
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} |
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void OS::LogSharedLibraryAddresses(Isolate* isolate) {
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unsigned int images_count = _dyld_image_count(); |
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for (unsigned int i = 0; i < images_count; ++i) { |
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const mach_header* header = _dyld_get_image_header(i);
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if (header == NULL) continue; |
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#if V8_HOST_ARCH_X64
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uint64_t size; |
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char* code_ptr = getsectdatafromheader_64(
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reinterpret_cast<const mach_header_64*>(header), |
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SEG_TEXT, |
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SECT_TEXT, |
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&size); |
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#else
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unsigned int size; |
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char* code_ptr = getsectdatafromheader(header, SEG_TEXT, SECT_TEXT, &size);
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#endif
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if (code_ptr == NULL) continue; |
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const uintptr_t slide = _dyld_get_image_vmaddr_slide(i);
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const uintptr_t start = reinterpret_cast<uintptr_t>(code_ptr) + slide; |
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LOG(isolate, |
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SharedLibraryEvent(_dyld_get_image_name(i), start, start + size)); |
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} |
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} |
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void OS::SignalCodeMovingGC() {
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} |
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const char* OS::LocalTimezone(double time) { |
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if (std::isnan(time)) return ""; |
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time_t tv = static_cast<time_t>(floor(time/msPerSecond));
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struct tm* t = localtime(&tv);
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if (NULL == t) return ""; |
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return t->tm_zone;
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} |
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double OS::LocalTimeOffset() {
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time_t tv = time(NULL);
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struct tm* t = localtime(&tv);
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// tm_gmtoff includes any daylight savings offset, so subtract it.
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return static_cast<double>(t->tm_gmtoff * msPerSecond - |
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(t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); |
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} |
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VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { } |
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VirtualMemory::VirtualMemory(size_t size) |
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: address_(ReserveRegion(size)), size_(size) { } |
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VirtualMemory::VirtualMemory(size_t size, size_t alignment) |
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: address_(NULL), size_(0) { |
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ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
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size_t request_size = RoundUp(size + alignment, |
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static_cast<intptr_t>(OS::AllocateAlignment()));
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void* reservation = mmap(OS::GetRandomMmapAddr(),
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request_size, |
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PROT_NONE, |
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MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, |
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kMmapFd, |
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kMmapFdOffset); |
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if (reservation == MAP_FAILED) return; |
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Address base = static_cast<Address>(reservation);
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Address aligned_base = RoundUp(base, alignment); |
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ASSERT_LE(base, aligned_base); |
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// Unmap extra memory reserved before and after the desired block.
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if (aligned_base != base) {
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size_t prefix_size = static_cast<size_t>(aligned_base - base);
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OS::Free(base, prefix_size); |
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request_size -= prefix_size; |
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} |
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size_t aligned_size = RoundUp(size, OS::AllocateAlignment()); |
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ASSERT_LE(aligned_size, request_size); |
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if (aligned_size != request_size) {
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size_t suffix_size = request_size - aligned_size; |
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OS::Free(aligned_base + aligned_size, suffix_size); |
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request_size -= suffix_size; |
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} |
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ASSERT(aligned_size == request_size); |
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address_ = static_cast<void*>(aligned_base); |
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size_ = aligned_size; |
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} |
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VirtualMemory::~VirtualMemory() { |
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if (IsReserved()) {
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bool result = ReleaseRegion(address(), size());
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ASSERT(result); |
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USE(result); |
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} |
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} |
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bool VirtualMemory::IsReserved() {
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return address_ != NULL; |
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} |
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void VirtualMemory::Reset() {
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address_ = NULL;
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size_ = 0;
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} |
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bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { |
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return CommitRegion(address, size, is_executable);
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} |
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bool VirtualMemory::Uncommit(void* address, size_t size) { |
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return UncommitRegion(address, size);
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} |
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bool VirtualMemory::Guard(void* address) { |
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OS::Guard(address, OS::CommitPageSize()); |
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return true; |
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} |
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void* VirtualMemory::ReserveRegion(size_t size) {
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void* result = mmap(OS::GetRandomMmapAddr(),
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size, |
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PROT_NONE, |
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MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, |
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kMmapFd, |
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kMmapFdOffset); |
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if (result == MAP_FAILED) return NULL; |
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return result;
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} |
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bool VirtualMemory::CommitRegion(void* address, |
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size_t size, |
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bool is_executable) {
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int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
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if (MAP_FAILED == mmap(address,
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size, |
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prot, |
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MAP_PRIVATE | MAP_ANON | MAP_FIXED, |
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kMmapFd, |
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kMmapFdOffset)) { |
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return false; |
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} |
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return true; |
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} |
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bool VirtualMemory::UncommitRegion(void* address, size_t size) { |
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return mmap(address,
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size, |
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PROT_NONE, |
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MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_FIXED, |
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kMmapFd, |
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kMmapFdOffset) != MAP_FAILED; |
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} |
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bool VirtualMemory::ReleaseRegion(void* address, size_t size) { |
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return munmap(address, size) == 0; |
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} |
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bool VirtualMemory::HasLazyCommits() {
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return false; |
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} |
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} } // namespace v8::internal
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