| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Platform-specific code for FreeBSD goes here. For the POSIX-compatible |
| // parts, the implementation is in platform-posix.cc. |
| |
| #include <pthread.h> |
| #include <semaphore.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <sys/resource.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/ucontext.h> |
| |
| #include <sys/fcntl.h> // open |
| #include <sys/mman.h> // mmap & munmap |
| #include <sys/stat.h> // open |
| #include <unistd.h> // getpagesize |
| // If you don't have execinfo.h then you need devel/libexecinfo from ports. |
| #include <errno.h> |
| #include <limits.h> |
| #include <stdarg.h> |
| #include <strings.h> // index |
| |
| #include <cmath> |
| |
| #undef MAP_TYPE |
| |
| #include "src/base/macros.h" |
| #include "src/base/platform/platform.h" |
| |
| |
| namespace v8 { |
| namespace base { |
| |
| |
| const char* OS::LocalTimezone(double time, TimezoneCache* cache) { |
| if (std::isnan(time)) return ""; |
| time_t tv = static_cast<time_t>(std::floor(time/msPerSecond)); |
| struct tm* t = localtime(&tv); // NOLINT(runtime/threadsafe_fn) |
| if (NULL == t) return ""; |
| return t->tm_zone; |
| } |
| |
| |
| double OS::LocalTimeOffset(TimezoneCache* cache) { |
| time_t tv = time(NULL); |
| struct tm* t = localtime(&tv); // NOLINT(runtime/threadsafe_fn) |
| // tm_gmtoff includes any daylight savings offset, so subtract it. |
| return static_cast<double>(t->tm_gmtoff * msPerSecond - |
| (t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); |
| } |
| |
| |
| void* OS::Allocate(const size_t requested, |
| size_t* allocated, |
| bool executable) { |
| const size_t msize = RoundUp(requested, getpagesize()); |
| int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0); |
| void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0); |
| |
| if (mbase == MAP_FAILED) return NULL; |
| *allocated = msize; |
| return mbase; |
| } |
| |
| |
| static unsigned StringToLong(char* buffer) { |
| return static_cast<unsigned>(strtol(buffer, NULL, 16)); // NOLINT |
| } |
| |
| |
| std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() { |
| std::vector<SharedLibraryAddress> result; |
| static const int MAP_LENGTH = 1024; |
| int fd = open("/proc/self/maps", O_RDONLY); |
| if (fd < 0) return result; |
| while (true) { |
| char addr_buffer[11]; |
| addr_buffer[0] = '0'; |
| addr_buffer[1] = 'x'; |
| addr_buffer[10] = 0; |
| ssize_t bytes_read = read(fd, addr_buffer + 2, 8); |
| if (bytes_read < 8) break; |
| unsigned start = StringToLong(addr_buffer); |
| bytes_read = read(fd, addr_buffer + 2, 1); |
| if (bytes_read < 1) break; |
| if (addr_buffer[2] != '-') break; |
| bytes_read = read(fd, addr_buffer + 2, 8); |
| if (bytes_read < 8) break; |
| unsigned end = StringToLong(addr_buffer); |
| char buffer[MAP_LENGTH]; |
| bytes_read = -1; |
| do { |
| bytes_read++; |
| if (bytes_read >= MAP_LENGTH - 1) |
| break; |
| bytes_read = read(fd, buffer + bytes_read, 1); |
| if (bytes_read < 1) break; |
| } while (buffer[bytes_read] != '\n'); |
| buffer[bytes_read] = 0; |
| // Ignore mappings that are not executable. |
| if (buffer[3] != 'x') continue; |
| char* start_of_path = index(buffer, '/'); |
| // There may be no filename in this line. Skip to next. |
| if (start_of_path == NULL) continue; |
| buffer[bytes_read] = 0; |
| result.push_back(SharedLibraryAddress(start_of_path, start, end)); |
| } |
| close(fd); |
| return result; |
| } |
| |
| |
| void OS::SignalCodeMovingGC() { |
| } |
| |
| |
| |
| // Constants used for mmap. |
| static const int kMmapFd = -1; |
| static const int kMmapFdOffset = 0; |
| |
| |
| VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { } |
| |
| |
| VirtualMemory::VirtualMemory(size_t size) |
| : address_(ReserveRegion(size)), size_(size) { } |
| |
| |
| VirtualMemory::VirtualMemory(size_t size, size_t alignment) |
| : address_(NULL), size_(0) { |
| DCHECK((alignment % OS::AllocateAlignment()) == 0); |
| size_t request_size = RoundUp(size + alignment, |
| static_cast<intptr_t>(OS::AllocateAlignment())); |
| void* reservation = mmap(OS::GetRandomMmapAddr(), |
| request_size, |
| PROT_NONE, |
| MAP_PRIVATE | MAP_ANON, |
| kMmapFd, |
| kMmapFdOffset); |
| if (reservation == MAP_FAILED) return; |
| |
| uint8_t* base = static_cast<uint8_t*>(reservation); |
| uint8_t* aligned_base = RoundUp(base, alignment); |
| DCHECK_LE(base, aligned_base); |
| |
| // Unmap extra memory reserved before and after the desired block. |
| if (aligned_base != base) { |
| size_t prefix_size = static_cast<size_t>(aligned_base - base); |
| OS::Free(base, prefix_size); |
| request_size -= prefix_size; |
| } |
| |
| size_t aligned_size = RoundUp(size, OS::AllocateAlignment()); |
| DCHECK_LE(aligned_size, request_size); |
| |
| if (aligned_size != request_size) { |
| size_t suffix_size = request_size - aligned_size; |
| OS::Free(aligned_base + aligned_size, suffix_size); |
| request_size -= suffix_size; |
| } |
| |
| DCHECK(aligned_size == request_size); |
| |
| address_ = static_cast<void*>(aligned_base); |
| size_ = aligned_size; |
| } |
| |
| |
| VirtualMemory::~VirtualMemory() { |
| if (IsReserved()) { |
| bool result = ReleaseRegion(address(), size()); |
| DCHECK(result); |
| USE(result); |
| } |
| } |
| |
| |
| bool VirtualMemory::IsReserved() { |
| return address_ != NULL; |
| } |
| |
| |
| void VirtualMemory::Reset() { |
| address_ = NULL; |
| size_ = 0; |
| } |
| |
| |
| bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { |
| return CommitRegion(address, size, is_executable); |
| } |
| |
| |
| bool VirtualMemory::Uncommit(void* address, size_t size) { |
| return UncommitRegion(address, size); |
| } |
| |
| |
| bool VirtualMemory::Guard(void* address) { |
| OS::Guard(address, OS::CommitPageSize()); |
| return true; |
| } |
| |
| |
| void* VirtualMemory::ReserveRegion(size_t size) { |
| void* result = mmap(OS::GetRandomMmapAddr(), |
| size, |
| PROT_NONE, |
| MAP_PRIVATE | MAP_ANON, |
| kMmapFd, |
| kMmapFdOffset); |
| |
| if (result == MAP_FAILED) return NULL; |
| |
| return result; |
| } |
| |
| |
| bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { |
| int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| if (MAP_FAILED == mmap(base, |
| size, |
| prot, |
| MAP_PRIVATE | MAP_ANON | MAP_FIXED, |
| kMmapFd, |
| kMmapFdOffset)) { |
| return false; |
| } |
| return true; |
| } |
| |
| |
| bool VirtualMemory::UncommitRegion(void* base, size_t size) { |
| return mmap(base, |
| size, |
| PROT_NONE, |
| MAP_PRIVATE | MAP_ANON | MAP_FIXED, |
| kMmapFd, |
| kMmapFdOffset) != MAP_FAILED; |
| } |
| |
| |
| bool VirtualMemory::ReleaseRegion(void* base, size_t size) { |
| return munmap(base, size) == 0; |
| } |
| |
| |
| bool VirtualMemory::HasLazyCommits() { |
| // TODO(alph): implement for the platform. |
| return false; |
| } |
| |
| } // namespace base |
| } // namespace v8 |