| // 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-posix-time.h" |
| #include "src/base/platform/platform-posix.h" |
| #include "src/base/platform/platform.h" |
| |
| namespace v8 { |
| namespace base { |
| |
| TimezoneCache* OS::CreateTimezoneCache() { |
| return new PosixDefaultTimezoneCache(); |
| } |
| |
| // Constants used for mmap. |
| static const int kMmapFd = -1; |
| static const int kMmapFdOffset = 0; |
| |
| void* OS::Allocate(const size_t requested, size_t* allocated, |
| OS::MemoryPermission access, void* hint) { |
| const size_t msize = RoundUp(requested, getpagesize()); |
| int prot = GetProtectionFromMemoryPermission(access); |
| void* mbase = |
| mmap(hint, msize, prot, MAP_PRIVATE | MAP_ANON, kMmapFd, kMmapFdOffset); |
| |
| if (mbase == MAP_FAILED) return NULL; |
| *allocated = msize; |
| return mbase; |
| } |
| |
| // static |
| void* OS::ReserveRegion(size_t size, void* hint) { |
| void* result = mmap(hint, size, PROT_NONE, MAP_PRIVATE | MAP_ANON, kMmapFd, |
| kMmapFdOffset); |
| |
| if (result == MAP_FAILED) return NULL; |
| |
| return result; |
| } |
| |
| // static |
| void* OS::ReserveAlignedRegion(size_t size, size_t alignment, void* hint, |
| size_t* allocated) { |
| hint = AlignedAddress(hint, alignment); |
| DCHECK((alignment % OS::AllocateAlignment()) == 0); |
| size_t request_size = RoundUp(size + alignment, |
| static_cast<intptr_t>(OS::AllocateAlignment())); |
| void* result = ReserveRegion(request_size, hint); |
| if (result == nullptr) { |
| *allocated = 0; |
| return nullptr; |
| } |
| |
| uint8_t* base = static_cast<uint8_t*>(result); |
| 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); |
| |
| *allocated = aligned_size; |
| return static_cast<void*>(aligned_base); |
| } |
| |
| // static |
| bool OS::CommitRegion(void* address, size_t size, bool is_executable) { |
| int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| if (MAP_FAILED == mmap(address, size, prot, |
| MAP_PRIVATE | MAP_ANON | MAP_FIXED, kMmapFd, |
| kMmapFdOffset)) { |
| return false; |
| } |
| return true; |
| } |
| |
| // static |
| bool OS::UncommitRegion(void* address, size_t size) { |
| return mmap(address, size, PROT_NONE, MAP_PRIVATE | MAP_ANON | MAP_FIXED, |
| kMmapFd, kMmapFdOffset) != MAP_FAILED; |
| } |
| |
| // static |
| bool OS::ReleaseRegion(void* address, size_t size) { |
| return munmap(address, size) == 0; |
| } |
| |
| // static |
| bool OS::ReleasePartialRegion(void* address, size_t size) { |
| return munmap(address, size) == 0; |
| } |
| |
| // static |
| bool OS::HasLazyCommits() { |
| // TODO(alph): implement for the platform. |
| return false; |
| } |
| |
| 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(void* hint) {} |
| |
| } // namespace base |
| } // namespace v8 |