[compiler-rt] r301089 - [builtins] Implement emulated TLS on Windows.
Frederich Munch via llvm-commits
llvm-commits at lists.llvm.org
Sat Apr 22 11:45:18 PDT 2017
Author: marsupial
Date: Sat Apr 22 13:45:17 2017
New Revision: 301089
URL: http://llvm.org/viewvc/llvm-project?rev=301089&view=rev
Log:
[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
Modified:
compiler-rt/trunk/lib/builtins/CMakeLists.txt
compiler-rt/trunk/lib/builtins/emutls.c
Modified: compiler-rt/trunk/lib/builtins/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/builtins/CMakeLists.txt?rev=301089&r1=301088&r2=301089&view=diff
==============================================================================
--- compiler-rt/trunk/lib/builtins/CMakeLists.txt (original)
+++ compiler-rt/trunk/lib/builtins/CMakeLists.txt Sat Apr 22 13:45:17 2017
@@ -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}
Modified: compiler-rt/trunk/lib/builtins/emutls.c
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/builtins/emutls.c?rev=301089&r1=301088&r2=301089&view=diff
==============================================================================
--- compiler-rt/trunk/lib/builtins/emutls.c (original)
+++ compiler-rt/trunk/lib/builtins/emutls.c Sat Apr 22 13:45:17 2017
@@ -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_al
#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_fre
#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_ob
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_
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_dat
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];
}
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