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Revert r301089 "[builtins] Implement emulated TLS on Windows." 

This broke the self-host build on Windows (PR32777).

Original commit message:

> [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: 301274
This commit is contained in:
Hans Wennborg 2017-04-24 23:16:49 +00:00
parent c02a1c0312
commit ac4799b3fc
2 changed files with 67 additions and 222 deletions
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9
compiler-rt/lib/builtins/CMakeLists.txt
View File

@ -164,8 +164,7 @@ set(GENERIC_SOURCES
udivti3.c
umoddi3.c
umodsi3.c
umodti3.c
emutls.c)
umodti3.c)
option(COMPILER_RT_EXCLUDE_ATOMIC_BUILTIN
"Skip the atomic builtin (this may be needed if system headers are unavailable)"
@ -188,6 +187,12 @@ 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}

280
compiler-rt/lib/builtins/emutls.c
View File

@ -7,7 +7,7 @@
*
* ===----------------------------------------------------------------------===
*/
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
@ -15,23 +15,6 @@
#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.
*/
@ -39,6 +22,26 @@ typedef unsigned int gcc_pointer __attribute__((mode(pointer)));
#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
@ -47,7 +50,7 @@ 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 = (char*)malloc(EXTRA_ALIGN_PTR_BYTES + size)) == NULL)
if ((object = malloc(EXTRA_ALIGN_PTR_BYTES + size)) == NULL)
abort();
base = (void*)(((uintptr_t)(object + EXTRA_ALIGN_PTR_BYTES))
& ~(uintptr_t)(align - 1));
@ -66,192 +69,10 @@ 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*));
@ -272,19 +93,45 @@ 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) {
emutls_init_once();
emutls_lock();
static pthread_once_t once = PTHREAD_ONCE_INIT;
pthread_once(&once, emutls_init);
pthread_mutex_lock(&emutls_mutex);
index = control->object.index;
if (!index) {
index = ++emutls_num_object;
__atomic_store_n(&control->object.index, index, __ATOMIC_RELEASE);
}
emutls_unlock();
pthread_mutex_unlock(&emutls_mutex);
}
return index;
}
@ -295,7 +142,7 @@ static __inline void emutls_check_array_set_size(emutls_address_array *array,
if (array == NULL)
abort();
array->size = size;
emutls_setspecific(array);
pthread_setspecific(emutls_pthread_key, (void*)array);
}
/* Returns the new 'data' array size, number of elements,
@ -309,29 +156,22 @@ 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 = emutls_getspecific();
emutls_address_array* array = pthread_getspecific(emutls_pthread_key);
if (array == NULL) {
uintptr_t new_size = emutls_new_data_array_size(index);
array = (emutls_address_array*) malloc(emutls_asize(new_size));
array = malloc(new_size * sizeof(void *) + sizeof(emutls_address_array));
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 = (emutls_address_array*) realloc(array, emutls_asize(new_size));
array = realloc(array, new_size * sizeof(void *) + sizeof(emutls_address_array));
if (array)
memset(array->data + orig_size, 0,
(new_size - orig_size) * sizeof(void*));
@ -342,8 +182,8 @@ 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] == NULL)
array->data[index] = emutls_allocate_object(control);
return array->data[index];
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];
}