| /* |
| * Stack-less Just-In-Time compiler |
| * |
| * Copyright 2009-2012 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_CALL sljit_grab_lock(void) |
| { |
| /* Always successful. */ |
| } |
| |
| SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL 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_CALL 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_CALL sljit_release_lock(void) |
| { |
| ReleaseMutex(global_mutex); |
| } |
| |
| #endif /* SLJIT_UTIL_GLOBAL_LOCK */ |
| |
| #else /* _WIN32 */ |
| |
| #if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR) |
| |
| #include <pthread.h> |
| |
| 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 <pthread.h> |
| |
| static pthread_mutex_t global_mutex = PTHREAD_MUTEX_INITIALIZER; |
| |
| SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_grab_lock(void) |
| { |
| pthread_mutex_lock(&global_mutex); |
| } |
| |
| SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL 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 <sys/mman.h> |
| /* For detecting the page size. */ |
| #include <unistd.h> |
| |
| #ifndef MAP_ANON |
| |
| #include <fcntl.h> |
| |
| /* Some old systems does not have MAP_ANON. */ |
| static sljit_si dev_zero = -1; |
| |
| #if (defined SLJIT_SINGLE_THREADED && SLJIT_SINGLE_THREADED) |
| |
| static SLJIT_INLINE sljit_si open_dev_zero(void) |
| { |
| dev_zero = open("/dev/zero", O_RDWR); |
| return dev_zero < 0; |
| } |
| |
| #else /* SLJIT_SINGLE_THREADED */ |
| |
| #include <pthread.h> |
| |
| static pthread_mutex_t dev_zero_mutex = PTHREAD_MUTEX_INITIALIZER; |
| |
| static SLJIT_INLINE sljit_si open_dev_zero(void) |
| { |
| pthread_mutex_lock(&dev_zero_mutex); |
| 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_CALL sljit_allocate_stack(sljit_uw limit, sljit_uw max_limit, void *allocator_data) |
| { |
| struct sljit_stack *stack; |
| union { |
| void *ptr; |
| sljit_uw uw; |
| } base; |
| #ifdef _WIN32 |
| SYSTEM_INFO si; |
| #endif |
| |
| SLJIT_UNUSED_ARG(allocator_data); |
| if (limit > max_limit || limit < 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 |
| |
| /* Align limit and max_limit. */ |
| max_limit = (max_limit + sljit_page_align) & ~sljit_page_align; |
| |
| stack = (struct sljit_stack*)SLJIT_MALLOC(sizeof(struct sljit_stack), allocator_data); |
| if (!stack) |
| return NULL; |
| |
| #ifdef _WIN32 |
| base.ptr = VirtualAlloc(NULL, max_limit, MEM_RESERVE, PAGE_READWRITE); |
| if (!base.ptr) { |
| SLJIT_FREE(stack, allocator_data); |
| return NULL; |
| } |
| stack->base = base.uw; |
| stack->limit = stack->base; |
| stack->max_limit = stack->base + max_limit; |
| if (sljit_stack_resize(stack, stack->base + limit)) { |
| sljit_free_stack(stack, allocator_data); |
| return NULL; |
| } |
| #else |
| #ifdef MAP_ANON |
| base.ptr = mmap(NULL, max_limit, 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; |
| } |
| } |
| base.ptr = mmap(NULL, max_limit, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0); |
| #endif |
| if (base.ptr == MAP_FAILED) { |
| SLJIT_FREE(stack, allocator_data); |
| return NULL; |
| } |
| stack->base = base.uw; |
| stack->limit = stack->base + limit; |
| stack->max_limit = stack->base + max_limit; |
| #endif |
| stack->top = stack->base; |
| return stack; |
| } |
| |
| #undef PAGE_ALIGN |
| |
| SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_free_stack(struct sljit_stack* stack, void *allocator_data) |
| { |
| SLJIT_UNUSED_ARG(allocator_data); |
| #ifdef _WIN32 |
| VirtualFree((void*)stack->base, 0, MEM_RELEASE); |
| #else |
| munmap((void*)stack->base, stack->max_limit - stack->base); |
| #endif |
| SLJIT_FREE(stack, allocator_data); |
| } |
| |
| SLJIT_API_FUNC_ATTRIBUTE sljit_sw SLJIT_CALL sljit_stack_resize(struct sljit_stack* stack, sljit_uw new_limit) |
| { |
| sljit_uw aligned_old_limit; |
| sljit_uw aligned_new_limit; |
| |
| if ((new_limit > stack->max_limit) || (new_limit < stack->base)) |
| return -1; |
| #ifdef _WIN32 |
| aligned_new_limit = (new_limit + sljit_page_align) & ~sljit_page_align; |
| aligned_old_limit = (stack->limit + sljit_page_align) & ~sljit_page_align; |
| if (aligned_new_limit != aligned_old_limit) { |
| if (aligned_new_limit > aligned_old_limit) { |
| if (!VirtualAlloc((void*)aligned_old_limit, aligned_new_limit - aligned_old_limit, MEM_COMMIT, PAGE_READWRITE)) |
| return -1; |
| } |
| else { |
| if (!VirtualFree((void*)aligned_new_limit, aligned_old_limit - aligned_new_limit, MEM_DECOMMIT)) |
| return -1; |
| } |
| } |
| stack->limit = new_limit; |
| return 0; |
| #else |
| if (new_limit >= stack->limit) { |
| stack->limit = new_limit; |
| return 0; |
| } |
| aligned_new_limit = (new_limit + sljit_page_align) & ~sljit_page_align; |
| aligned_old_limit = (stack->limit + sljit_page_align) & ~sljit_page_align; |
| /* If madvise is available, we release the unnecessary space. */ |
| #if defined(MADV_DONTNEED) |
| if (aligned_new_limit < aligned_old_limit) |
| madvise((void*)aligned_new_limit, aligned_old_limit - aligned_new_limit, MADV_DONTNEED); |
| #elif defined(POSIX_MADV_DONTNEED) |
| if (aligned_new_limit < aligned_old_limit) |
| posix_madvise((void*)aligned_new_limit, aligned_old_limit - aligned_new_limit, POSIX_MADV_DONTNEED); |
| #endif |
| stack->limit = new_limit; |
| return 0; |
| #endif |
| } |
| |
| #endif /* SLJIT_UTIL_STACK */ |
| |
| #endif |