+++ /dev/null
-/*
- * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
- * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- */
-
-#include "config.h"
-#include "StackBounds.h"
-
-#if OS(DARWIN)
-
-#include <mach/task.h>
-#include <mach/thread_act.h>
-#include <pthread.h>
-
-#elif OS(WINDOWS)
-
-#include <windows.h>
-
-#elif OS(HAIKU)
-
-#include <OS.h>
-
-#elif OS(SOLARIS)
-
-#include <thread.h>
-
-#elif OS(QNX)
-
-#include <fcntl.h>
-#include <sys/procfs.h>
-#include <stdio.h>
-#include <errno.h>
-
-#elif OS(UNIX)
-
-#include <pthread.h>
-#if HAVE(PTHREAD_NP_H)
-#include <pthread_np.h>
-#endif
-
-#endif
-
-#include <WTFThreadData.h>
-
-namespace WTF {
-
-// Bug 26276 - Need a mechanism to determine stack extent
-//
-// These platforms should now be working correctly:
-// DARWIN, QNX, UNIX, SYMBIAN
-// These platforms are not:
-// WINDOWS, SOLARIS, OPENBSD, HAIKU, WINCE
-//
-// FIXME: remove this! - this code unsafely guesses at stack sizes!
-#if OS(WINDOWS) || OS(SOLARIS) || OS(OPENBSD) || OS(HAIKU)
-// Based on the current limit used by the JSC parser, guess the stack size.
-static const ptrdiff_t estimatedStackSize = 128 * sizeof(void*) * 1024;
-// This method assumes the stack is growing downwards.
-static void* estimateStackBound(void* origin)
-{
- return static_cast<char*>(origin) - estimatedStackSize;
-}
-#endif
-
-#if OS(DARWIN)
-
-void StackBounds::initialize()
-{
- pthread_t thread = pthread_self();
- m_origin = pthread_get_stackaddr_np(thread);
- m_bound = static_cast<char*>(m_origin) - pthread_get_stacksize_np(thread);
-}
-
-void StackBounds::checkConsistency() const
-{
-#if !ASSERT_DISABLED
- // Skip consistency check if this StackBounds was initialized
- // on a different thread than the current thread.
- const StackBounds* stack = &wtfThreadData().stack();
- if (stack != this)
- return;
-
- void* currentPosition = ¤tPosition;
- ASSERT(m_origin != m_bound);
- ASSERT(isGrowingDownward()
- ? (currentPosition < m_origin && currentPosition > m_bound)
- : (currentPosition > m_origin && currentPosition < m_bound));
-#endif
-}
-
-#elif OS(QNX)
-
-void StackBounds::initialize()
-{
- void* stackBase = 0;
- size_t stackSize = 0;
- pthread_t thread = pthread_self();
-
- struct _debug_thread_info threadInfo;
- memset(&threadInfo, 0, sizeof(threadInfo));
- threadInfo.tid = pthread_self();
- int fd = open("/proc/self", O_RDONLY);
- if (fd == -1) {
- LOG_ERROR("Unable to open /proc/self (errno: %d)", errno);
- CRASH();
- }
- devctl(fd, DCMD_PROC_TIDSTATUS, &threadInfo, sizeof(threadInfo), 0);
- close(fd);
- stackBase = reinterpret_cast<void*>(threadInfo.stkbase);
- stackSize = threadInfo.stksize;
- ASSERT(stackBase);
-
- m_bound = stackBase;
- m_origin = static_cast<char*>(stackBase) + stackSize;
-}
-
-#elif OS(SOLARIS)
-
-void StackBounds::initialize()
-{
- stack_t s;
- thr_stksegment(&s);
- m_origin = s.ss_sp;
- m_bound = estimateStackBound(m_origin);
-}
-
-#elif OS(OPENBSD)
-
-void StackBounds::initialize()
-{
- pthread_t thread = pthread_self();
- stack_t stack;
- pthread_stackseg_np(thread, &stack);
- m_origin = stack.ss_sp;
- m_bound = estimateStackBound(m_origin);
-}
-
-#elif OS(SYMBIAN)
-
-void StackBounds::initialize()
-{
- TThreadStackInfo info;
- RThread thread;
- thread.StackInfo(info);
- m_origin = (void*)info.iBase;
- m_bound = (void*)info.iLimit;
-}
-
-#elif OS(HAIKU)
-
-void StackBounds::initialize()
-{
- thread_info threadInfo;
- get_thread_info(find_thread(NULL), &threadInfo);
- m_origin = threadInfo.stack_end;
- m_bound = estimateStackBound(m_origin);
-}
-
-#elif OS(UNIX)
-
-void StackBounds::initialize()
-{
- void* stackBase = 0;
- size_t stackSize = 0;
-
- pthread_t thread = pthread_self();
- pthread_attr_t sattr;
- pthread_attr_init(&sattr);
-#if HAVE(PTHREAD_NP_H) || OS(NETBSD)
- // e.g. on FreeBSD 5.4, neundorf@kde.org
- pthread_attr_get_np(thread, &sattr);
-#else
- // FIXME: this function is non-portable; other POSIX systems may have different np alternatives
- pthread_getattr_np(thread, &sattr);
-#endif
- int rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
- (void)rc; // FIXME: Deal with error code somehow? Seems fatal.
- ASSERT(stackBase);
- pthread_attr_destroy(&sattr);
- m_bound = stackBase;
- m_origin = static_cast<char*>(stackBase) + stackSize;
-}
-
-#elif OS(WINCE)
-
-static bool detectGrowingDownward(void* previousFrame)
-{
- // Find the address of this stack frame by taking the address of a local variable.
- int thisFrame;
- return previousFrame > &thisFrame;
-}
-
-static inline bool isPageWritable(void* page)
-{
- MEMORY_BASIC_INFORMATION memoryInformation;
- DWORD result = VirtualQuery(page, &memoryInformation, sizeof(memoryInformation));
-
- // return false on error, including ptr outside memory
- if (result != sizeof(memoryInformation))
- return false;
-
- DWORD protect = memoryInformation.Protect & ~(PAGE_GUARD | PAGE_NOCACHE);
- return protect == PAGE_READWRITE
- || protect == PAGE_WRITECOPY
- || protect == PAGE_EXECUTE_READWRITE
- || protect == PAGE_EXECUTE_WRITECOPY;
-}
-
-static inline void* getLowerStackBound(char* currentPage, DWORD pageSize)
-{
- while (currentPage > 0) {
- // check for underflow
- if (currentPage >= reinterpret_cast<char*>(pageSize))
- currentPage -= pageSize;
- else
- currentPage = 0;
-
- if (!isPageWritable(currentPage))
- return currentPage + pageSize;
- }
-
- return 0;
-}
-
-static inline void* getUpperStackBound(char* currentPage, DWORD pageSize)
-{
- do {
- // guaranteed to complete because isPageWritable returns false at end of memory
- currentPage += pageSize;
- } while (isPageWritable(currentPage));
-
- return currentPage - pageSize;
-}
-
-void StackBounds::initialize()
-{
- // find the address of this stack frame by taking the address of a local variable
- void* thisFrame = &thisFrame;
- bool isGrowingDownward = detectGrowingDownward(thisFrame);
-
- SYSTEM_INFO systemInfo;
- GetSystemInfo(&systemInfo);
- DWORD pageSize = systemInfo.dwPageSize;
-
- // scan all of memory starting from this frame, and return the last writeable page found
- char* currentPage = reinterpret_cast<char*>(reinterpret_cast<DWORD>(thisFrame) & ~(pageSize - 1));
- void* lowerStackBound = getLowerStackBound(currentPage, pageSize);
- void* upperStackBound = getUpperStackBound(currentPage, pageSize);
-
- m_origin = isGrowingDownward ? upperStackBound : lowerStackBound;
- m_bound = isGrowingDownward ? lowerStackBound : upperStackBound;
-}
-
-#elif OS(WINDOWS)
-
-void StackBounds::initialize()
-{
-#if CPU(X86) && COMPILER(MSVC)
- // offset 0x18 from the FS segment register gives a pointer to
- // the thread information block for the current thread
- NT_TIB* pTib;
- __asm {
- MOV EAX, FS:[18h]
- MOV pTib, EAX
- }
- m_origin = static_cast<void*>(pTib->StackBase);
-#elif CPU(X86) && COMPILER(GCC)
- // offset 0x18 from the FS segment register gives a pointer to
- // the thread information block for the current thread
- NT_TIB* pTib;
- asm ( "movl %%fs:0x18, %0\n"
- : "=r" (pTib)
- );
- m_origin = static_cast<void*>(pTib->StackBase);
-#elif CPU(X86_64)
- PNT_TIB64 pTib = reinterpret_cast<PNT_TIB64>(NtCurrentTeb());
- m_origin = reinterpret_cast<void*>(pTib->StackBase);
-#else
-#error Need a way to get the stack bounds on this platform (Windows)
-#endif
- // Looks like we should be able to get pTib->StackLimit
- m_bound = estimateStackBound(m_origin);
-}
-
-#else
-#error Need a way to get the stack bounds on this platform
-#endif
-
-} // namespace WTF
projects / apple / javascriptcore.git / blobdiff