| // 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-posix.h" |
| #include "src/base/platform/platform.h" |
| |
| namespace v8 { |
| namespace base { |
| |
| |
| int64_t get_gmt_offset(const tm& localtm) { |
| // replacement for tm->tm_gmtoff field in glibc |
| // returns seconds east of UTC, taking DST into account |
| struct timeval tv; |
| struct timezone tz; |
| int ret_code = gettimeofday(&tv, &tz); |
| // 0 = success, -1 = failure |
| DCHECK_NE(ret_code, -1); |
| if (ret_code == -1) { |
| return 0; |
| } |
| return (-tz.tz_minuteswest * 60) + (localtm.tm_isdst > 0 ? 3600 : 0); |
| } |
| |
| class AIXTimezoneCache : public PosixTimezoneCache { |
| const char* LocalTimezone(double time) override; |
| |
| double LocalTimeOffset(double time_ms, bool is_utc) override; |
| |
| ~AIXTimezoneCache() override {} |
| }; |
| |
| const char* AIXTimezoneCache::LocalTimezone(double time_ms) { |
| if (std::isnan(time_ms)) return ""; |
| time_t tv = static_cast<time_t>(floor(time_ms / msPerSecond)); |
| struct tm tm; |
| struct tm* t = localtime_r(&tv, &tm); |
| if (nullptr == t) return ""; |
| return tzname[0]; // The location of the timezone string on AIX. |
| } |
| |
| double AIXTimezoneCache::LocalTimeOffset(double time_ms, bool is_utc) { |
| // On AIX, struct tm does not contain a tm_gmtoff field, use get_gmt_offset |
| // helper function |
| time_t utc = time(nullptr); |
| DCHECK_NE(utc, -1); |
| struct tm tm; |
| struct tm* loc = localtime_r(&utc, &tm); |
| DCHECK_NOT_NULL(loc); |
| return static_cast<double>(get_gmt_offset(*loc) * msPerSecond - |
| (loc->tm_isdst > 0 ? 3600 * msPerSecond : 0)); |
| } |
| |
| TimezoneCache* OS::CreateTimezoneCache() { return new AIXTimezoneCache(); } |
| |
| static unsigned StringToLong(char* buffer) { |
| return static_cast<unsigned>(strtol(buffer, nullptr, 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 == nullptr) continue; |
| buffer[bytes_read] = 0; |
| result.push_back(SharedLibraryAddress(start_of_path, start, end)); |
| } |
| close(fd); |
| return result; |
| } |
| |
| void OS::SignalCodeMovingGC() {} |
| |
| void OS::AdjustSchedulingParams() {} |
| |
| // static |
| Stack::StackSlot Stack::GetStackStart() { |
| // pthread_getthrds_np creates 3 values: |
| // __pi_stackaddr, __pi_stacksize, __pi_stackend |
| |
| // higher address ----- __pi_stackend, stack base |
| // |
| // | |
| // | __pi_stacksize, stack grows downwards |
| // | |
| // V |
| // |
| // lower address ----- __pi_stackaddr, current sp |
| |
| pthread_t tid = pthread_self(); |
| struct __pthrdsinfo buf; |
| // clear buf |
| memset(&buf, 0, sizeof(buf)); |
| char regbuf[1]; |
| int regbufsize = sizeof(regbuf); |
| const int rc = pthread_getthrds_np(&tid, PTHRDSINFO_QUERY_ALL, &buf, |
| sizeof(buf), regbuf, ®bufsize); |
| CHECK(!rc); |
| if (buf.__pi_stackend == NULL || buf.__pi_stackaddr == NULL) { |
| return nullptr; |
| } |
| return reinterpret_cast<void*>(buf.__pi_stackend); |
| } |
| |
| } // namespace base |
| } // namespace v8 |