X-Git-Url: http://ftp.carnet.hr/carnet-debian/scm?a=blobdiff_plain;ds=sidebyside;f=src%2Fexternal%2Fpcre2-10.32%2Fsrc%2Fsljit%2FsljitUtils.c;fp=src%2Fexternal%2Fpcre2-10.32%2Fsrc%2Fsljit%2FsljitUtils.c;h=5c2a83893281a4406c0590965018cd0accad3f9b;hb=3f728675941dc69d4e544d3a880a56240a6e394a;hp=0000000000000000000000000000000000000000;hpb=927951d1c1ad45ba9e7325f07d996154a91c911b;p=ossec-hids.git diff --git a/src/external/pcre2-10.32/src/sljit/sljitUtils.c b/src/external/pcre2-10.32/src/sljit/sljitUtils.c new file mode 100644 index 0000000..5c2a838 --- /dev/null +++ b/src/external/pcre2-10.32/src/sljit/sljitUtils.c @@ -0,0 +1,333 @@ +/* + * Stack-less Just-In-Time compiler + * + * Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, are + * permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this list of + * conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, this list + * of conditions and the following disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* ------------------------------------------------------------------------ */ +/* Locks */ +/* ------------------------------------------------------------------------ */ + +#if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR) || (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK) + +#if (defined SLJIT_SINGLE_THREADED && SLJIT_SINGLE_THREADED) + +#if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR) + +static SLJIT_INLINE void allocator_grab_lock(void) +{ + /* Always successful. */ +} + +static SLJIT_INLINE void allocator_release_lock(void) +{ + /* Always successful. */ +} + +#endif /* SLJIT_EXECUTABLE_ALLOCATOR */ + +#if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK) + +SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_grab_lock(void) +{ + /* Always successful. */ +} + +SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_release_lock(void) +{ + /* Always successful. */ +} + +#endif /* SLJIT_UTIL_GLOBAL_LOCK */ + +#elif defined(_WIN32) /* SLJIT_SINGLE_THREADED */ + +#include "windows.h" + +#if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR) + +static HANDLE allocator_mutex = 0; + +static SLJIT_INLINE void allocator_grab_lock(void) +{ + /* No idea what to do if an error occures. Static mutexes should never fail... */ + if (!allocator_mutex) + allocator_mutex = CreateMutex(NULL, TRUE, NULL); + else + WaitForSingleObject(allocator_mutex, INFINITE); +} + +static SLJIT_INLINE void allocator_release_lock(void) +{ + ReleaseMutex(allocator_mutex); +} + +#endif /* SLJIT_EXECUTABLE_ALLOCATOR */ + +#if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK) + +static HANDLE global_mutex = 0; + +SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_grab_lock(void) +{ + /* No idea what to do if an error occures. Static mutexes should never fail... */ + if (!global_mutex) + global_mutex = CreateMutex(NULL, TRUE, NULL); + else + WaitForSingleObject(global_mutex, INFINITE); +} + +SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_release_lock(void) +{ + ReleaseMutex(global_mutex); +} + +#endif /* SLJIT_UTIL_GLOBAL_LOCK */ + +#else /* _WIN32 */ + +#if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR) + +#include + +static pthread_mutex_t allocator_mutex = PTHREAD_MUTEX_INITIALIZER; + +static SLJIT_INLINE void allocator_grab_lock(void) +{ + pthread_mutex_lock(&allocator_mutex); +} + +static SLJIT_INLINE void allocator_release_lock(void) +{ + pthread_mutex_unlock(&allocator_mutex); +} + +#endif /* SLJIT_EXECUTABLE_ALLOCATOR */ + +#if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK) + +#include + +static pthread_mutex_t global_mutex = PTHREAD_MUTEX_INITIALIZER; + +SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_grab_lock(void) +{ + pthread_mutex_lock(&global_mutex); +} + +SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_release_lock(void) +{ + pthread_mutex_unlock(&global_mutex); +} + +#endif /* SLJIT_UTIL_GLOBAL_LOCK */ + +#endif /* _WIN32 */ + +/* ------------------------------------------------------------------------ */ +/* Stack */ +/* ------------------------------------------------------------------------ */ + +#if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK) || (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR) + +#ifdef _WIN32 +#include "windows.h" +#else +/* Provides mmap function. */ +#include +/* For detecting the page size. */ +#include + +#ifndef MAP_ANON + +#include + +/* Some old systems does not have MAP_ANON. */ +static sljit_s32 dev_zero = -1; + +#if (defined SLJIT_SINGLE_THREADED && SLJIT_SINGLE_THREADED) + +static SLJIT_INLINE sljit_s32 open_dev_zero(void) +{ + dev_zero = open("/dev/zero", O_RDWR); + return dev_zero < 0; +} + +#else /* SLJIT_SINGLE_THREADED */ + +#include + +static pthread_mutex_t dev_zero_mutex = PTHREAD_MUTEX_INITIALIZER; + +static SLJIT_INLINE sljit_s32 open_dev_zero(void) +{ + pthread_mutex_lock(&dev_zero_mutex); + /* The dev_zero might be initialized by another thread during the waiting. */ + if (dev_zero < 0) { + dev_zero = open("/dev/zero", O_RDWR); + } + pthread_mutex_unlock(&dev_zero_mutex); + return dev_zero < 0; +} + +#endif /* SLJIT_SINGLE_THREADED */ + +#endif + +#endif + +#endif /* SLJIT_UTIL_STACK || SLJIT_EXECUTABLE_ALLOCATOR */ + +#if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK) + +/* Planning to make it even more clever in the future. */ +static sljit_sw sljit_page_align = 0; + +SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_FUNC sljit_allocate_stack(sljit_uw start_size, sljit_uw max_size, void *allocator_data) +{ + struct sljit_stack *stack; + void *ptr; +#ifdef _WIN32 + SYSTEM_INFO si; +#endif + + SLJIT_UNUSED_ARG(allocator_data); + if (start_size > max_size || start_size < 1) + return NULL; + +#ifdef _WIN32 + if (!sljit_page_align) { + GetSystemInfo(&si); + sljit_page_align = si.dwPageSize - 1; + } +#else + if (!sljit_page_align) { + sljit_page_align = sysconf(_SC_PAGESIZE); + /* Should never happen. */ + if (sljit_page_align < 0) + sljit_page_align = 4096; + sljit_page_align--; + } +#endif + + stack = (struct sljit_stack*)SLJIT_MALLOC(sizeof(struct sljit_stack), allocator_data); + if (!stack) + return NULL; + + /* Align max_size. */ + max_size = (max_size + sljit_page_align) & ~sljit_page_align; + +#ifdef _WIN32 + ptr = VirtualAlloc(NULL, max_size, MEM_RESERVE, PAGE_READWRITE); + if (!ptr) { + SLJIT_FREE(stack, allocator_data); + return NULL; + } + + stack->min_start = (sljit_u8 *)ptr; + stack->end = stack->min_start + max_size; + stack->start = stack->end; + + if (sljit_stack_resize(stack, stack->end - start_size) == NULL) { + sljit_free_stack(stack, allocator_data); + return NULL; + } +#else +#ifdef MAP_ANON + ptr = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); +#else + if (dev_zero < 0) { + if (open_dev_zero()) { + SLJIT_FREE(stack, allocator_data); + return NULL; + } + } + ptr = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0); +#endif + if (ptr == MAP_FAILED) { + SLJIT_FREE(stack, allocator_data); + return NULL; + } + stack->min_start = (sljit_u8 *)ptr; + stack->end = stack->min_start + max_size; + stack->start = stack->end - start_size; +#endif + stack->top = stack->end; + return stack; +} + +#undef PAGE_ALIGN + +SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_free_stack(struct sljit_stack *stack, void *allocator_data) +{ + SLJIT_UNUSED_ARG(allocator_data); +#ifdef _WIN32 + VirtualFree((void*)stack->min_start, 0, MEM_RELEASE); +#else + munmap((void*)stack->min_start, stack->end - stack->min_start); +#endif + SLJIT_FREE(stack, allocator_data); +} + +SLJIT_API_FUNC_ATTRIBUTE sljit_u8 *SLJIT_FUNC sljit_stack_resize(struct sljit_stack *stack, sljit_u8 *new_start) +{ + sljit_uw aligned_old_start; + sljit_uw aligned_new_start; + + if ((new_start < stack->min_start) || (new_start >= stack->end)) + return NULL; + +#ifdef _WIN32 + aligned_new_start = (sljit_uw)new_start & ~sljit_page_align; + aligned_old_start = ((sljit_uw)stack->start) & ~sljit_page_align; + if (aligned_new_start != aligned_old_start) { + if (aligned_new_start < aligned_old_start) { + if (!VirtualAlloc((void*)aligned_new_start, aligned_old_start - aligned_new_start, MEM_COMMIT, PAGE_READWRITE)) + return NULL; + } + else { + if (!VirtualFree((void*)aligned_old_start, aligned_new_start - aligned_old_start, MEM_DECOMMIT)) + return NULL; + } + } +#else + if (stack->start < new_start) { + aligned_new_start = (sljit_uw)new_start & ~sljit_page_align; + aligned_old_start = ((sljit_uw)stack->start) & ~sljit_page_align; + /* If madvise is available, we release the unnecessary space. */ +#if defined(MADV_DONTNEED) + if (aligned_new_start > aligned_old_start) + madvise((void*)aligned_old_start, aligned_new_start - aligned_old_start, MADV_DONTNEED); +#elif defined(POSIX_MADV_DONTNEED) + if (aligned_new_start > aligned_old_start) + posix_madvise((void*)aligned_old_start, aligned_new_start - aligned_old_start, POSIX_MADV_DONTNEED); +#endif + } +#endif + stack->start = new_start; + return new_start; +} + +#endif /* SLJIT_UTIL_STACK */ + +#endif