[builtins] Implement emulated TLS on Windows.
Summary: LLVM JIT needs to be able to use emulated TLS on all platforms, and this provides a reference one can compile to enable emutls for Linux/Mac/Windows. Reviewers: chh, howard.hinnant Reviewed By: chh Subscribers: mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D30787 llvm-svn: 301089
This commit is contained in:
Frederich Munch
parent
3b863f8a1e
commit
5de7f2d7b8
|
|
@ -164,7 +164,8 @@ set(GENERIC_SOURCES
|
|||
udivti3.c
|
||||
umoddi3.c
|
||||
umodsi3.c
|
||||
umodti3.c)
|
||||
umodti3.c
|
||||
emutls.c)
|
||||
|
||||
option(COMPILER_RT_EXCLUDE_ATOMIC_BUILTIN
|
||||
"Skip the atomic builtin (this may be needed if system headers are unavailable)"
|
||||
|
|
@ -187,12 +188,6 @@ if(APPLE)
|
|||
atomic_thread_fence.c)
|
||||
endif()
|
||||
|
||||
if(NOT WIN32 OR MINGW)
|
||||
set(GENERIC_SOURCES
|
||||
${GENERIC_SOURCES}
|
||||
emutls.c)
|
||||
endif()
|
||||
|
||||
if (HAVE_UNWIND_H)
|
||||
set(GENERIC_SOURCES
|
||||
${GENERIC_SOURCES}
|
||||
|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
|||
*
|
||||
* ===----------------------------------------------------------------------===
|
||||
*/
|
||||
#include <pthread.h>
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
|
@ -15,6 +15,23 @@
|
|||
#include "int_lib.h"
|
||||
#include "int_util.h"
|
||||
|
||||
typedef struct emutls_address_array {
|
||||
uintptr_t size; /* number of elements in the 'data' array */
|
||||
void* data[];
|
||||
} emutls_address_array;
|
||||
|
||||
static void emutls_shutdown(emutls_address_array *array);
|
||||
|
||||
#ifndef _WIN32
|
||||
|
||||
#include <pthread.h>
|
||||
|
||||
static pthread_mutex_t emutls_mutex = PTHREAD_MUTEX_INITIALIZER;
|
||||
static pthread_key_t emutls_pthread_key;
|
||||
|
||||
typedef unsigned int gcc_word __attribute__((mode(word)));
|
||||
typedef unsigned int gcc_pointer __attribute__((mode(pointer)));
|
||||
|
||||
/* Default is not to use posix_memalign, so systems like Android
|
||||
* can use thread local data without heavier POSIX memory allocators.
|
||||
*/
|
||||
|
|
@ -22,26 +39,6 @@
|
|||
#define EMUTLS_USE_POSIX_MEMALIGN 0
|
||||
#endif
|
||||
|
||||
/* For every TLS variable xyz,
|
||||
* there is one __emutls_control variable named __emutls_v.xyz.
|
||||
* If xyz has non-zero initial value, __emutls_v.xyz's "value"
|
||||
* will point to __emutls_t.xyz, which has the initial value.
|
||||
*/
|
||||
typedef unsigned int gcc_word __attribute__((mode(word)));
|
||||
typedef struct __emutls_control {
|
||||
/* Must use gcc_word here, instead of size_t, to match GCC. When
|
||||
gcc_word is larger than size_t, the upper extra bits are all
|
||||
zeros. We can use variables of size_t to operate on size and
|
||||
align. */
|
||||
gcc_word size; /* size of the object in bytes */
|
||||
gcc_word align; /* alignment of the object in bytes */
|
||||
union {
|
||||
uintptr_t index; /* data[index-1] is the object address */
|
||||
void* address; /* object address, when in single thread env */
|
||||
} object;
|
||||
void* value; /* null or non-zero initial value for the object */
|
||||
} __emutls_control;
|
||||
|
||||
static __inline void *emutls_memalign_alloc(size_t align, size_t size) {
|
||||
void *base;
|
||||
#if EMUTLS_USE_POSIX_MEMALIGN
|
||||
|
|
@ -50,7 +47,7 @@ static __inline void *emutls_memalign_alloc(size_t align, size_t size) {
|
|||
#else
|
||||
#define EXTRA_ALIGN_PTR_BYTES (align - 1 + sizeof(void*))
|
||||
char* object;
|
||||
if ((object = malloc(EXTRA_ALIGN_PTR_BYTES + size)) == NULL)
|
||||
if ((object = (char*)malloc(EXTRA_ALIGN_PTR_BYTES + size)) == NULL)
|
||||
abort();
|
||||
base = (void*)(((uintptr_t)(object + EXTRA_ALIGN_PTR_BYTES))
|
||||
& ~(uintptr_t)(align - 1));
|
||||
|
|
@ -69,10 +66,192 @@ static __inline void emutls_memalign_free(void *base) {
|
|||
#endif
|
||||
}
|
||||
|
||||
static void emutls_key_destructor(void* ptr) {
|
||||
emutls_shutdown((emutls_address_array*)ptr);
|
||||
free(ptr);
|
||||
}
|
||||
|
||||
static __inline void emutls_init(void) {
|
||||
if (pthread_key_create(&emutls_pthread_key, emutls_key_destructor) != 0)
|
||||
abort();
|
||||
}
|
||||
|
||||
static __inline void emutls_init_once(void) {
|
||||
static pthread_once_t once = PTHREAD_ONCE_INIT;
|
||||
pthread_once(&once, emutls_init);
|
||||
}
|
||||
|
||||
static __inline void emutls_lock() {
|
||||
pthread_mutex_lock(&emutls_mutex);
|
||||
}
|
||||
|
||||
static __inline void emutls_unlock() {
|
||||
pthread_mutex_unlock(&emutls_mutex);
|
||||
}
|
||||
|
||||
static __inline void emutls_setspecific(emutls_address_array *value) {
|
||||
pthread_setspecific(emutls_pthread_key, (void*) value);
|
||||
}
|
||||
|
||||
static __inline emutls_address_array* emutls_getspecific() {
|
||||
return (emutls_address_array*) pthread_getspecific(emutls_pthread_key);
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
#include <Windows.h>
|
||||
#include <malloc.h>
|
||||
#include <stdio.h>
|
||||
#include <assert.h>
|
||||
#include <immintrin.h>
|
||||
|
||||
static LPCRITICAL_SECTION emutls_mutex;
|
||||
static DWORD emutls_tls_index = TLS_OUT_OF_INDEXES;
|
||||
|
||||
typedef uintptr_t gcc_word;
|
||||
typedef void * gcc_pointer;
|
||||
|
||||
static void win_error(DWORD last_err, const char *hint) {
|
||||
char *buffer = NULL;
|
||||
if (FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
|
||||
FORMAT_MESSAGE_FROM_SYSTEM |
|
||||
FORMAT_MESSAGE_MAX_WIDTH_MASK,
|
||||
NULL, last_err, 0, (LPSTR)&buffer, 1, NULL)) {
|
||||
fprintf(stderr, "Windows error: %s\n", buffer);
|
||||
} else {
|
||||
fprintf(stderr, "Unkown Windows error: %s\n", hint);
|
||||
}
|
||||
LocalFree(buffer);
|
||||
}
|
||||
|
||||
static __inline void win_abort(DWORD last_err, const char *hint) {
|
||||
win_error(last_err, hint);
|
||||
abort();
|
||||
}
|
||||
|
||||
static __inline void *emutls_memalign_alloc(size_t align, size_t size) {
|
||||
void *base = _aligned_malloc(size, align);
|
||||
if (!base)
|
||||
win_abort(GetLastError(), "_aligned_malloc");
|
||||
return base;
|
||||
}
|
||||
|
||||
static __inline void emutls_memalign_free(void *base) {
|
||||
_aligned_free(base);
|
||||
}
|
||||
|
||||
static void emutls_exit(void) {
|
||||
if (emutls_mutex) {
|
||||
DeleteCriticalSection(emutls_mutex);
|
||||
_aligned_free(emutls_mutex);
|
||||
emutls_mutex = NULL;
|
||||
}
|
||||
if (emutls_tls_index != TLS_OUT_OF_INDEXES) {
|
||||
emutls_shutdown((emutls_address_array*)TlsGetValue(emutls_tls_index));
|
||||
TlsFree(emutls_tls_index);
|
||||
emutls_tls_index = TLS_OUT_OF_INDEXES;
|
||||
}
|
||||
}
|
||||
|
||||
#pragma warning (push)
|
||||
#pragma warning (disable : 4100)
|
||||
static BOOL CALLBACK emutls_init(PINIT_ONCE p0, PVOID p1, PVOID *p2) {
|
||||
emutls_mutex = (LPCRITICAL_SECTION)_aligned_malloc(sizeof(CRITICAL_SECTION), 16);
|
||||
if (!emutls_mutex) {
|
||||
win_error(GetLastError(), "_aligned_malloc");
|
||||
return FALSE;
|
||||
}
|
||||
InitializeCriticalSection(emutls_mutex);
|
||||
|
||||
emutls_tls_index = TlsAlloc();
|
||||
if (emutls_tls_index == TLS_OUT_OF_INDEXES) {
|
||||
emutls_exit();
|
||||
win_error(GetLastError(), "TlsAlloc");
|
||||
return FALSE;
|
||||
}
|
||||
atexit(&emutls_exit);
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
static __inline void emutls_init_once(void) {
|
||||
static INIT_ONCE once;
|
||||
InitOnceExecuteOnce(&once, emutls_init, NULL, NULL);
|
||||
}
|
||||
|
||||
static __inline void emutls_lock() {
|
||||
EnterCriticalSection(emutls_mutex);
|
||||
}
|
||||
|
||||
static __inline void emutls_unlock() {
|
||||
LeaveCriticalSection(emutls_mutex);
|
||||
}
|
||||
|
||||
static __inline void emutls_setspecific(emutls_address_array *value) {
|
||||
if (TlsSetValue(emutls_tls_index, (LPVOID) value) == 0)
|
||||
win_abort(GetLastError(), "TlsSetValue");
|
||||
}
|
||||
|
||||
static __inline emutls_address_array* emutls_getspecific() {
|
||||
LPVOID value = TlsGetValue(emutls_tls_index);
|
||||
if (value == NULL) {
|
||||
const DWORD err = GetLastError();
|
||||
if (err != ERROR_SUCCESS)
|
||||
win_abort(err, "TlsGetValue");
|
||||
}
|
||||
return (emutls_address_array*) value;
|
||||
}
|
||||
|
||||
enum { __ATOMIC_ACQUIRE, __ATOMIC_RELEASE };
|
||||
|
||||
static __inline uintptr_t __atomic_load_n(void *ptr, unsigned type) {
|
||||
assert(type == __ATOMIC_ACQUIRE);
|
||||
return (uintptr_t) _load_be_u64(ptr);
|
||||
}
|
||||
|
||||
static __inline void __atomic_store_n(void *ptr, uintptr_t val, unsigned type) {
|
||||
assert(type == __ATOMIC_RELEASE);
|
||||
_store_be_u64(ptr, val);
|
||||
}
|
||||
#pragma warning (pop)
|
||||
|
||||
#endif
|
||||
|
||||
static size_t emutls_num_object = 0; /* number of allocated TLS objects */
|
||||
|
||||
/* Free the allocated TLS data
|
||||
*/
|
||||
static void emutls_shutdown(emutls_address_array *array) {
|
||||
if (array) {
|
||||
uintptr_t i;
|
||||
for (i = 0; i < array->size; ++i) {
|
||||
if (array->data[i])
|
||||
emutls_memalign_free(array->data[i]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* For every TLS variable xyz,
|
||||
* there is one __emutls_control variable named __emutls_v.xyz.
|
||||
* If xyz has non-zero initial value, __emutls_v.xyz's "value"
|
||||
* will point to __emutls_t.xyz, which has the initial value.
|
||||
*/
|
||||
typedef struct __emutls_control {
|
||||
/* Must use gcc_word here, instead of size_t, to match GCC. When
|
||||
gcc_word is larger than size_t, the upper extra bits are all
|
||||
zeros. We can use variables of size_t to operate on size and
|
||||
align. */
|
||||
gcc_word size; /* size of the object in bytes */
|
||||
gcc_word align; /* alignment of the object in bytes */
|
||||
union {
|
||||
uintptr_t index; /* data[index-1] is the object address */
|
||||
void* address; /* object address, when in single thread env */
|
||||
} object;
|
||||
void* value; /* null or non-zero initial value for the object */
|
||||
} __emutls_control;
|
||||
|
||||
/* Emulated TLS objects are always allocated at run-time. */
|
||||
static __inline void *emutls_allocate_object(__emutls_control *control) {
|
||||
/* Use standard C types, check with gcc's emutls.o. */
|
||||
typedef unsigned int gcc_pointer __attribute__((mode(pointer)));
|
||||
COMPILE_TIME_ASSERT(sizeof(uintptr_t) == sizeof(gcc_pointer));
|
||||
COMPILE_TIME_ASSERT(sizeof(uintptr_t) == sizeof(void*));
|
||||
|
||||
|
|
@ -93,45 +272,19 @@ static __inline void *emutls_allocate_object(__emutls_control *control) {
|
|||
return base;
|
||||
}
|
||||
|
||||
static pthread_mutex_t emutls_mutex = PTHREAD_MUTEX_INITIALIZER;
|
||||
|
||||
static size_t emutls_num_object = 0; /* number of allocated TLS objects */
|
||||
|
||||
typedef struct emutls_address_array {
|
||||
uintptr_t size; /* number of elements in the 'data' array */
|
||||
void* data[];
|
||||
} emutls_address_array;
|
||||
|
||||
static pthread_key_t emutls_pthread_key;
|
||||
|
||||
static void emutls_key_destructor(void* ptr) {
|
||||
emutls_address_array* array = (emutls_address_array*)ptr;
|
||||
uintptr_t i;
|
||||
for (i = 0; i < array->size; ++i) {
|
||||
if (array->data[i])
|
||||
emutls_memalign_free(array->data[i]);
|
||||
}
|
||||
free(ptr);
|
||||
}
|
||||
|
||||
static void emutls_init(void) {
|
||||
if (pthread_key_create(&emutls_pthread_key, emutls_key_destructor) != 0)
|
||||
abort();
|
||||
}
|
||||
|
||||
/* Returns control->object.index; set index if not allocated yet. */
|
||||
static __inline uintptr_t emutls_get_index(__emutls_control *control) {
|
||||
uintptr_t index = __atomic_load_n(&control->object.index, __ATOMIC_ACQUIRE);
|
||||
if (!index) {
|
||||
static pthread_once_t once = PTHREAD_ONCE_INIT;
|
||||
pthread_once(&once, emutls_init);
|
||||
pthread_mutex_lock(&emutls_mutex);
|
||||
emutls_init_once();
|
||||
emutls_lock();
|
||||
index = control->object.index;
|
||||
if (!index) {
|
||||
index = ++emutls_num_object;
|
||||
__atomic_store_n(&control->object.index, index, __ATOMIC_RELEASE);
|
||||
}
|
||||
pthread_mutex_unlock(&emutls_mutex);
|
||||
emutls_unlock();
|
||||
}
|
||||
return index;
|
||||
}
|
||||
|
|
@ -142,7 +295,7 @@ static __inline void emutls_check_array_set_size(emutls_address_array *array,
|
|||
if (array == NULL)
|
||||
abort();
|
||||
array->size = size;
|
||||
pthread_setspecific(emutls_pthread_key, (void*)array);
|
||||
emutls_setspecific(array);
|
||||
}
|
||||
|
||||
/* Returns the new 'data' array size, number of elements,
|
||||
|
|
@ -156,22 +309,29 @@ static __inline uintptr_t emutls_new_data_array_size(uintptr_t index) {
|
|||
return ((index + 1 + 15) & ~((uintptr_t)15)) - 1;
|
||||
}
|
||||
|
||||
/* Returns the size in bytes required for an emutls_address_array with
|
||||
* N number of elements for data field.
|
||||
*/
|
||||
static __inline uintptr_t emutls_asize(uintptr_t N) {
|
||||
return N * sizeof(void *) + sizeof(emutls_address_array);
|
||||
}
|
||||
|
||||
/* Returns the thread local emutls_address_array.
|
||||
* Extends its size if necessary to hold address at index.
|
||||
*/
|
||||
static __inline emutls_address_array *
|
||||
emutls_get_address_array(uintptr_t index) {
|
||||
emutls_address_array* array = pthread_getspecific(emutls_pthread_key);
|
||||
emutls_address_array* array = emutls_getspecific();
|
||||
if (array == NULL) {
|
||||
uintptr_t new_size = emutls_new_data_array_size(index);
|
||||
array = malloc(new_size * sizeof(void *) + sizeof(emutls_address_array));
|
||||
array = (emutls_address_array*) malloc(emutls_asize(new_size));
|
||||
if (array)
|
||||
memset(array->data, 0, new_size * sizeof(void*));
|
||||
emutls_check_array_set_size(array, new_size);
|
||||
} else if (index > array->size) {
|
||||
uintptr_t orig_size = array->size;
|
||||
uintptr_t new_size = emutls_new_data_array_size(index);
|
||||
array = realloc(array, new_size * sizeof(void *) + sizeof(emutls_address_array));
|
||||
array = (emutls_address_array*) realloc(array, emutls_asize(new_size));
|
||||
if (array)
|
||||
memset(array->data + orig_size, 0,
|
||||
(new_size - orig_size) * sizeof(void*));
|
||||
|
|
@ -182,8 +342,8 @@ emutls_get_address_array(uintptr_t index) {
|
|||
|
||||
void* __emutls_get_address(__emutls_control* control) {
|
||||
uintptr_t index = emutls_get_index(control);
|
||||
emutls_address_array* array = emutls_get_address_array(index);
|
||||
if (array->data[index - 1] == NULL)
|
||||
array->data[index - 1] = emutls_allocate_object(control);
|
||||
return array->data[index - 1];
|
||||
emutls_address_array* array = emutls_get_address_array(index--);
|
||||
if (array->data[index] == NULL)
|
||||
array->data[index] = emutls_allocate_object(control);
|
||||
return array->data[index];
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue