| // Copyright 2014 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 AIX goes here. For the POSIX comaptible parts |
| // the implementation is in platform-posix.cc. |
| |
| #include <pthread.h> |
| #include <semaphore.h> |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/resource.h> |
| #include <sys/time.h> |
| #include <sys/ucontext.h> |
| |
| #include <errno.h> |
| #include <fcntl.h> // open |
| #include <limits.h> |
| #include <stdarg.h> |
| #include <strings.h> // index |
| #include <sys/mman.h> // mmap & munmap |
| #include <sys/stat.h> // open |
| #include <sys/types.h> // mmap & munmap |
| #include <unistd.h> // getpagesize |
| |
| #include <cmath> |
| |
| #undef MAP_TYPE |
| |
| #include "src/base/macros.h" |
| #include "src/base/platform/platform.h" |
| |
| |
| namespace v8 { |
| namespace base { |
| |
| |
| static inline void* mmapHelper(size_t len, int prot, int flags, int fildes, |
| off_t off) { |
| void* addr = OS::GetRandomMmapAddr(); |
| return mmap(addr, len, prot, flags, fildes, off); |
| } |
| |
| |
| const char* OS::LocalTimezone(double time, TimezoneCache* cache) { |
| if (std::isnan(time)) return ""; |
| time_t tv = static_cast<time_t>(floor(time / msPerSecond)); |
| struct tm* t = localtime(&tv); // NOLINT(runtime/threadsafe_fn) |
| if (NULL == t) return ""; |
| return tzname[0]; // The location of the timezone string on AIX. |
| } |
| |
| |
| double OS::LocalTimeOffset(TimezoneCache* cache) { |
| // On AIX, struct tm does not contain a tm_gmtoff field. |
| time_t utc = time(NULL); |
| DCHECK(utc != -1); |
| struct tm* loc = localtime(&utc); // NOLINT(runtime/threadsafe_fn) |
| DCHECK(loc != NULL); |
| return static_cast<double>((mktime(loc) - utc) * msPerSecond); |
| } |
| |
| |
| 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 = mmapHelper(msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -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 rc = read(fd, addr_buffer + 2, 8); |
| if (rc < 8) break; |
| unsigned start = StringToLong(addr_buffer); |
| rc = read(fd, addr_buffer + 2, 1); |
| if (rc < 1) break; |
| if (addr_buffer[2] != '-') break; |
| rc = read(fd, addr_buffer + 2, 8); |
| if (rc < 8) break; |
| unsigned end = StringToLong(addr_buffer); |
| char buffer[MAP_LENGTH]; |
| int bytes_read = -1; |
| do { |
| bytes_read++; |
| if (bytes_read >= MAP_LENGTH - 1) break; |
| rc = read(fd, buffer + bytes_read, 1); |
| if (rc < 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 = |
| mmapHelper(request_size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, 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 = mmapHelper(size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, |
| kMmapFd, kMmapFdOffset); |
| |
| if (result == MAP_FAILED) return NULL; |
| |
| return result; |
| } |
| |
| |
| bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { |
| #if defined(__native_client__) |
| // The Native Client port of V8 uses an interpreter, |
| // so code pages don't need PROT_EXEC. |
| int prot = PROT_READ | PROT_WRITE; |
| #else |
| int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| #endif |
| if (mprotect(base, size, prot) == -1) return false; |
| |
| return true; |
| } |
| |
| |
| bool VirtualMemory::UncommitRegion(void* base, size_t size) { |
| return mprotect(base, size, PROT_NONE) != -1; |
| } |
| |
| |
| bool VirtualMemory::ReleaseRegion(void* base, size_t size) { |
| return munmap(base, size) == 0; |
| } |
| |
| |
| bool VirtualMemory::HasLazyCommits() { return true; } |
| } // namespace base |
| } // namespace v8 |