js/src/jsnativestack.cpp@b8a032363ba2 (annotated)
js/src/jsnativestack.cpp
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * vim: set ts=8 sts=4 et sw=4 tw=99: |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "jsnativestack.h" |
| michael@0 | 8 | |
| michael@0 | 9 | #ifdef XP_WIN |
| michael@0 | 10 | # include "jswin.h" |
| michael@0 | 11 | |
| michael@0 | 12 | #elif defined(XP_MACOSX) || defined(DARWIN) || defined(XP_UNIX) |
| michael@0 | 13 | # include <pthread.h> |
| michael@0 | 14 | |
| michael@0 | 15 | # if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) |
| michael@0 | 16 | # include <pthread_np.h> |
| michael@0 | 17 | # endif |
| michael@0 | 18 | |
| michael@0 | 19 | # if defined(ANDROID) |
| michael@0 | 20 | # include <sys/types.h> |
| michael@0 | 21 | # include <unistd.h> |
| michael@0 | 22 | # endif |
| michael@0 | 23 | |
| michael@0 | 24 | #else |
| michael@0 | 25 | # error "Unsupported platform" |
| michael@0 | 26 | |
| michael@0 | 27 | #endif |
| michael@0 | 28 | |
| michael@0 | 29 | #if defined(XP_WIN) |
| michael@0 | 30 | |
| michael@0 | 31 | void * |
| michael@0 | 32 | js::GetNativeStackBaseImpl() |
| michael@0 | 33 | { |
| michael@0 | 34 | # if defined(_M_IX86) && defined(_MSC_VER) |
| michael@0 | 35 | /* |
| michael@0 | 36 | * offset 0x18 from the FS segment register gives a pointer to |
| michael@0 | 37 | * the thread information block for the current thread |
| michael@0 | 38 | */ |
| michael@0 | 39 | NT_TIB* pTib; |
| michael@0 | 40 | __asm { |
| michael@0 | 41 | MOV EAX, FS:[18h] |
| michael@0 | 42 | MOV pTib, EAX |
| michael@0 | 43 | } |
| michael@0 | 44 | return static_cast<void*>(pTib->StackBase); |
| michael@0 | 45 | |
| michael@0 | 46 | # elif defined(_M_X64) |
| michael@0 | 47 | PNT_TIB64 pTib = reinterpret_cast<PNT_TIB64>(NtCurrentTeb()); |
| michael@0 | 48 | return reinterpret_cast<void*>(pTib->StackBase); |
| michael@0 | 49 | |
| michael@0 | 50 | # elif defined(_WIN32) && defined(__GNUC__) |
| michael@0 | 51 | NT_TIB* pTib; |
| michael@0 | 52 | asm ("movl %%fs:0x18, %0\n" : "=r" (pTib)); |
| michael@0 | 53 | return static_cast<void*>(pTib->StackBase); |
| michael@0 | 54 | |
| michael@0 | 55 | # endif |
| michael@0 | 56 | } |
| michael@0 | 57 | |
| michael@0 | 58 | #elif defined(SOLARIS) |
| michael@0 | 59 | |
| michael@0 | 60 | #include <ucontext.h> |
| michael@0 | 61 | |
| michael@0 | 62 | JS_STATIC_ASSERT(JS_STACK_GROWTH_DIRECTION < 0); |
| michael@0 | 63 | |
| michael@0 | 64 | void * |
| michael@0 | 65 | js::GetNativeStackBaseImpl() |
| michael@0 | 66 | { |
| michael@0 | 67 | stack_t st; |
| michael@0 | 68 | stack_getbounds(&st); |
| michael@0 | 69 | return static_cast<char*>(st.ss_sp) + st.ss_size; |
| michael@0 | 70 | } |
| michael@0 | 71 | |
| michael@0 | 72 | #elif defined(AIX) |
| michael@0 | 73 | |
| michael@0 | 74 | #include <ucontext.h> |
| michael@0 | 75 | |
| michael@0 | 76 | JS_STATIC_ASSERT(JS_STACK_GROWTH_DIRECTION < 0); |
| michael@0 | 77 | |
| michael@0 | 78 | void * |
| michael@0 | 79 | js::GetNativeStackBaseImpl() |
| michael@0 | 80 | { |
| michael@0 | 81 | ucontext_t context; |
| michael@0 | 82 | getcontext(&context); |
| michael@0 | 83 | return static_cast<char*>(context.uc_stack.ss_sp) + |
| michael@0 | 84 | context.uc_stack.ss_size; |
| michael@0 | 85 | } |
| michael@0 | 86 | |
| michael@0 | 87 | #else /* XP_UNIX */ |
| michael@0 | 88 | |
| michael@0 | 89 | void * |
| michael@0 | 90 | js::GetNativeStackBaseImpl() |
| michael@0 | 91 | { |
| michael@0 | 92 | pthread_t thread = pthread_self(); |
| michael@0 | 93 | # if defined(XP_MACOSX) || defined(DARWIN) |
| michael@0 | 94 | return pthread_get_stackaddr_np(thread); |
| michael@0 | 95 | |
| michael@0 | 96 | # else |
| michael@0 | 97 | pthread_attr_t sattr; |
| michael@0 | 98 | pthread_attr_init(&sattr); |
| michael@0 | 99 | # if defined(__OpenBSD__) |
| michael@0 | 100 | stack_t ss; |
| michael@0 | 101 | # elif defined(PTHREAD_NP_H) || defined(_PTHREAD_NP_H_) || defined(NETBSD) |
| michael@0 | 102 | /* e.g. on FreeBSD 4.8 or newer, neundorf@kde.org */ |
| michael@0 | 103 | pthread_attr_get_np(thread, &sattr); |
| michael@0 | 104 | # else |
| michael@0 | 105 | /* |
| michael@0 | 106 | * FIXME: this function is non-portable; |
| michael@0 | 107 | * other POSIX systems may have different np alternatives |
| michael@0 | 108 | */ |
| michael@0 | 109 | pthread_getattr_np(thread, &sattr); |
| michael@0 | 110 | # endif |
| michael@0 | 111 | |
| michael@0 | 112 | void *stackBase = 0; |
| michael@0 | 113 | size_t stackSize = 0; |
| michael@0 | 114 | int rc; |
| michael@0 | 115 | # if defined(__OpenBSD__) |
| michael@0 | 116 | rc = pthread_stackseg_np(pthread_self(), &ss); |
| michael@0 | 117 | stackBase = (void*)((size_t) ss.ss_sp - ss.ss_size); |
| michael@0 | 118 | stackSize = ss.ss_size; |
| michael@0 | 119 | # elif defined(ANDROID) |
| michael@0 | 120 | if (gettid() == getpid()) { |
| michael@0 | 121 | // bionic's pthread_attr_getstack doesn't tell the truth for the main |
| michael@0 | 122 | // thread (see bug 846670). So we scan /proc/self/maps to find the |
| michael@0 | 123 | // segment which contains the stack. |
| michael@0 | 124 | rc = -1; |
| michael@0 | 125 | FILE *fs = fopen("/proc/self/maps", "r"); |
| michael@0 | 126 | if (fs) { |
| michael@0 | 127 | char line[100]; |
| michael@0 | 128 | unsigned long stackAddr = (unsigned long)&sattr; |
| michael@0 | 129 | while (fgets(line, sizeof(line), fs) != nullptr) { |
| michael@0 | 130 | unsigned long stackStart; |
| michael@0 | 131 | unsigned long stackEnd; |
| michael@0 | 132 | if (sscanf(line, "%lx-%lx ", &stackStart, &stackEnd) == 2 && |
| michael@0 | 133 | stackAddr >= stackStart && stackAddr < stackEnd) { |
| michael@0 | 134 | stackBase = (void *)stackStart; |
| michael@0 | 135 | stackSize = stackEnd - stackStart; |
| michael@0 | 136 | rc = 0; |
| michael@0 | 137 | break; |
| michael@0 | 138 | } |
| michael@0 | 139 | } |
| michael@0 | 140 | fclose(fs); |
| michael@0 | 141 | } |
| michael@0 | 142 | } else |
| michael@0 | 143 | // For non main-threads pthread allocates the stack itself so it tells |
| michael@0 | 144 | // the truth. |
| michael@0 | 145 | rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize); |
| michael@0 | 146 | # else |
| michael@0 | 147 | rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize); |
| michael@0 | 148 | # endif |
| michael@0 | 149 | if (rc) |
| michael@0 | 150 | MOZ_CRASH(); |
| michael@0 | 151 | JS_ASSERT(stackBase); |
| michael@0 | 152 | pthread_attr_destroy(&sattr); |
| michael@0 | 153 | |
| michael@0 | 154 | # if JS_STACK_GROWTH_DIRECTION > 0 |
| michael@0 | 155 | return stackBase; |
| michael@0 | 156 | # else |
| michael@0 | 157 | return static_cast<char*>(stackBase) + stackSize; |
| michael@0 | 158 | # endif |
| michael@0 | 159 | # endif |
| michael@0 | 160 | } |
| michael@0 | 161 | |
| michael@0 | 162 | #endif /* !XP_WIN */ |
