From 2cf6c8816a73e0132bd8fa3b509d62d7c51b6e47 Mon Sep 17 00:00:00 2001 From: Simon Hausmann Date: Mon, 7 May 2012 11:21:11 +0200 Subject: Imported WebKit commit 7e538425aa020340619e927792f3d895061fb54b (http://svn.webkit.org/repository/webkit/trunk@116286) --- Source/JavaScriptCore/wtf/StackBounds.cpp | 261 ------------------------------ 1 file changed, 261 deletions(-) delete mode 100644 Source/JavaScriptCore/wtf/StackBounds.cpp (limited to 'Source/JavaScriptCore/wtf/StackBounds.cpp') diff --git a/Source/JavaScriptCore/wtf/StackBounds.cpp b/Source/JavaScriptCore/wtf/StackBounds.cpp deleted file mode 100644 index a272ce3de..000000000 --- a/Source/JavaScriptCore/wtf/StackBounds.cpp +++ /dev/null @@ -1,261 +0,0 @@ -/* - * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. - * Copyright (C) 2007 Eric Seidel - * - * 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 -#include -#include - -#elif OS(WINDOWS) - -#include - -#elif OS(SOLARIS) - -#include - -#elif OS(QNX) - -#include -#include -#include -#include -#include -#include - -#elif OS(UNIX) - -#include -#if HAVE(PTHREAD_NP_H) -#include -#endif - -#endif - -namespace WTF { - -// Bug 26276 - Need a mechanism to determine stack extent -// -// These platforms should now be working correctly: -// DARWIN, QNX, UNIX -// These platforms are not: -// WINDOWS, SOLARIS, OPENBSD, WINCE -// -// FIXME: remove this! - this code unsafely guesses at stack sizes! -#if OS(WINDOWS) || OS(SOLARIS) || OS(OPENBSD) -// 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(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(m_origin) - pthread_get_stacksize_np(thread); -} - -#elif OS(QNX) - -void StackBounds::initialize() -{ - void* stackBase = 0; - size_t stackSize = 0; - - 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(threadInfo.stkbase); - stackSize = threadInfo.stksize; - ASSERT(stackBase); - - m_bound = static_cast(stackBase) + 0x1000; // 4kb guard page - m_origin = static_cast(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(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(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(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(reinterpret_cast(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(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(pTib->StackBase); -#elif CPU(X86_64) - PNT_TIB64 pTib = reinterpret_cast(NtCurrentTeb()); - m_origin = reinterpret_cast(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 -- cgit v1.2.1