1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Platform specific code for AIX goes here. For the POSIX comaptible parts
6 // the implementation is in platform-posix.cc.
7
8 #include <pthread.h>
9 #include <semaphore.h>
10 #include <signal.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <sys/resource.h>
14 #include <sys/time.h>
15 #include <sys/ucontext.h>
16
17 #include <errno.h>
18 #include <fcntl.h> // open
19 #include <limits.h>
20 #include <stdarg.h>
21 #include <strings.h> // index
22 #include <sys/mman.h> // mmap & munmap
23 #include <sys/stat.h> // open
24 #include <sys/types.h> // mmap & munmap
25 #include <unistd.h> // getpagesize
26
27 #include <cmath>
28
29 #undef MAP_TYPE
30
31 #include "src/base/macros.h"
32 #include "src/base/platform/platform-posix.h"
33 #include "src/base/platform/platform.h"
34
35 namespace v8 {
36 namespace base {
37
38
39 class AIXTimezoneCache : public PosixTimezoneCache {
40 const char* LocalTimezone(double time) override;
41
42 double LocalTimeOffset(double time_ms, bool is_utc) override;
43
~AIXTimezoneCache()44 ~AIXTimezoneCache() override {}
45 };
46
LocalTimezone(double time_ms)47 const char* AIXTimezoneCache::LocalTimezone(double time_ms) {
48 if (std::isnan(time_ms)) return "";
49 time_t tv = static_cast<time_t>(floor(time_ms / msPerSecond));
50 struct tm tm;
51 struct tm* t = localtime_r(&tv, &tm);
52 if (nullptr == t) return "";
53 return tzname[0]; // The location of the timezone string on AIX.
54 }
55
LocalTimeOffset(double time_ms,bool is_utc)56 double AIXTimezoneCache::LocalTimeOffset(double time_ms, bool is_utc) {
57 // On AIX, struct tm does not contain a tm_gmtoff field.
58 time_t utc = time(nullptr);
59 DCHECK_NE(utc, -1);
60 struct tm tm;
61 struct tm* loc = localtime_r(&utc, &tm);
62 DCHECK_NOT_NULL(loc);
63 return static_cast<double>((mktime(loc) - utc) * msPerSecond);
64 }
65
CreateTimezoneCache()66 TimezoneCache* OS::CreateTimezoneCache() { return new AIXTimezoneCache(); }
67
StringToLong(char * buffer)68 static unsigned StringToLong(char* buffer) {
69 return static_cast<unsigned>(strtol(buffer, nullptr, 16)); // NOLINT
70 }
71
GetSharedLibraryAddresses()72 std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
73 std::vector<SharedLibraryAddress> result;
74 static const int MAP_LENGTH = 1024;
75 int fd = open("/proc/self/maps", O_RDONLY);
76 if (fd < 0) return result;
77 while (true) {
78 char addr_buffer[11];
79 addr_buffer[0] = '0';
80 addr_buffer[1] = 'x';
81 addr_buffer[10] = 0;
82 ssize_t rc = read(fd, addr_buffer + 2, 8);
83 if (rc < 8) break;
84 unsigned start = StringToLong(addr_buffer);
85 rc = read(fd, addr_buffer + 2, 1);
86 if (rc < 1) break;
87 if (addr_buffer[2] != '-') break;
88 rc = read(fd, addr_buffer + 2, 8);
89 if (rc < 8) break;
90 unsigned end = StringToLong(addr_buffer);
91 char buffer[MAP_LENGTH];
92 int bytes_read = -1;
93 do {
94 bytes_read++;
95 if (bytes_read >= MAP_LENGTH - 1) break;
96 rc = read(fd, buffer + bytes_read, 1);
97 if (rc < 1) break;
98 } while (buffer[bytes_read] != '\n');
99 buffer[bytes_read] = 0;
100 // Ignore mappings that are not executable.
101 if (buffer[3] != 'x') continue;
102 char* start_of_path = index(buffer, '/');
103 // There may be no filename in this line. Skip to next.
104 if (start_of_path == nullptr) continue;
105 buffer[bytes_read] = 0;
106 result.push_back(SharedLibraryAddress(start_of_path, start, end));
107 }
108 close(fd);
109 return result;
110 }
111
SignalCodeMovingGC()112 void OS::SignalCodeMovingGC() {}
113
114 } // namespace base
115 } // namespace v8
116