//===-- tsan_interceptors_libdispatch.cpp ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
// Support for intercepting libdispatch (GCD).
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_common.h"
#include "interception/interception.h"
#include "tsan_interceptors.h"
#include "tsan_rtl.h"
#include "BlocksRuntime/Block.h"
#include "tsan_dispatch_defs.h"
namespace __tsan {
typedef u16 uint16_t;
typedef struct {
dispatch_queue_t queue;
void *orig_context;
dispatch_function_t orig_work;
bool free_context_in_callback;
bool submitted_synchronously;
bool is_barrier_block;
uptr non_queue_sync_object;
} block_context_t;
// The offsets of different fields of the dispatch_queue_t structure, exported
// by libdispatch.dylib.
extern "C" struct dispatch_queue_offsets_s {
const uint16_t dqo_version;
const uint16_t dqo_label;
const uint16_t dqo_label_size;
const uint16_t dqo_flags;
const uint16_t dqo_flags_size;
const uint16_t dqo_serialnum;
const uint16_t dqo_serialnum_size;
const uint16_t dqo_width;
const uint16_t dqo_width_size;
const uint16_t dqo_running;
const uint16_t dqo_running_size;
const uint16_t dqo_suspend_cnt;
const uint16_t dqo_suspend_cnt_size;
const uint16_t dqo_target_queue;
const uint16_t dqo_target_queue_size;
const uint16_t dqo_priority;
const uint16_t dqo_priority_size;
} dispatch_queue_offsets;
static bool IsQueueSerial(dispatch_queue_t q) {
CHECK_EQ(dispatch_queue_offsets.dqo_width_size, 2);
uptr width = *(uint16_t *)(((uptr)q) + dispatch_queue_offsets.dqo_width);
CHECK_NE(width, 0);
return width == 1;
}
static dispatch_queue_t GetTargetQueueFromQueue(dispatch_queue_t q) {
CHECK_EQ(dispatch_queue_offsets.dqo_target_queue_size, 8);
dispatch_queue_t tq = *(
dispatch_queue_t *)(((uptr)q) + dispatch_queue_offsets.dqo_target_queue);
return tq;
}
static dispatch_queue_t GetTargetQueueFromSource(dispatch_source_t source) {
dispatch_queue_t tq = GetTargetQueueFromQueue((dispatch_queue_t)source);
CHECK_NE(tq, 0);
return tq;
}
static block_context_t *AllocContext(ThreadState *thr, uptr pc,
dispatch_queue_t queue, void *orig_context,
dispatch_function_t orig_work) {
block_context_t *new_context =
(block_context_t *)user_alloc_internal(thr, pc, sizeof(block_context_t));
new_context->queue = queue;
new_context->orig_context = orig_context;
new_context->orig_work = orig_work;
new_context->free_context_in_callback = true;
new_context->submitted_synchronously = false;
new_context->is_barrier_block = false;
new_context->non_queue_sync_object = 0;
return new_context;
}
#define GET_QUEUE_SYNC_VARS(context, q) \
bool is_queue_serial = q && IsQueueSerial(q); \
uptr sync_ptr = (uptr)q ?: context->non_queue_sync_object; \
uptr serial_sync = (uptr)sync_ptr; \
uptr concurrent_sync = sync_ptr ? ((uptr)sync_ptr) + sizeof(uptr) : 0; \
bool serial_task = context->is_barrier_block || is_queue_serial
static void dispatch_sync_pre_execute(ThreadState *thr, uptr pc,
block_context_t *context) {
uptr submit_sync = (uptr)context;
Acquire(thr, pc, submit_sync);
dispatch_queue_t q = context->queue;
do {
GET_QUEUE_SYNC_VARS(context, q);
if (serial_sync) Acquire(thr, pc, serial_sync);
if (serial_task && concurrent_sync) Acquire(thr, pc, concurrent_sync);
if (q) q = GetTargetQueueFromQueue(q);
} while (q);
}
static void dispatch_sync_post_execute(ThreadState *thr, uptr pc,
block_context_t *context) {
uptr submit_sync = (uptr)context;
if (context->submitted_synchronously) Release(thr, pc, submit_sync);
dispatch_queue_t q = context->queue;
do {
GET_QUEUE_SYNC_VARS(context, q);
if (serial_task && serial_sync) Release(thr, pc, serial_sync);
if (!serial_task && concurrent_sync) Release(thr, pc, concurrent_sync);
if (q) q = GetTargetQueueFromQueue(q);
} while (q);
}
static void dispatch_callback_wrap(void *param) {
SCOPED_INTERCEPTOR_RAW(dispatch_callback_wrap);
block_context_t *context = (block_context_t *)param;
dispatch_sync_pre_execute(thr, pc, context);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
context->orig_work(context->orig_context);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
dispatch_sync_post_execute(thr, pc, context);
if (context->free_context_in_callback) user_free(thr, pc, context);
}
static void invoke_block(void *param) {
dispatch_block_t block = (dispatch_block_t)param;
block();
}
static void invoke_and_release_block(void *param) {
dispatch_block_t block = (dispatch_block_t)param;
block();
Block_release(block);
}
#define DISPATCH_INTERCEPT_ASYNC_B(name, barrier) \
TSAN_INTERCEPTOR(void, name, dispatch_queue_t q, dispatch_block_t block) { \
SCOPED_TSAN_INTERCEPTOR(name, q, block); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START(); \
dispatch_block_t heap_block = Block_copy(block); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END(); \
block_context_t *new_context = \
AllocContext(thr, pc, q, heap_block, &invoke_and_release_block); \
new_context->is_barrier_block = barrier; \
Release(thr, pc, (uptr)new_context); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START(); \
REAL(name##_f)(q, new_context, dispatch_callback_wrap); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END(); \
}
#define DISPATCH_INTERCEPT_SYNC_B(name, barrier) \
TSAN_INTERCEPTOR(void, name, dispatch_queue_t q, \
DISPATCH_NOESCAPE dispatch_block_t block) { \
SCOPED_TSAN_INTERCEPTOR(name, q, block); \
block_context_t new_context = { \
q, block, &invoke_block, false, true, barrier, 0}; \
Release(thr, pc, (uptr)&new_context); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START(); \
REAL(name##_f)(q, &new_context, dispatch_callback_wrap); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END(); \
Acquire(thr, pc, (uptr)&new_context); \
}
#define DISPATCH_INTERCEPT_ASYNC_F(name, barrier) \
TSAN_INTERCEPTOR(void, name, dispatch_queue_t q, void *context, \
dispatch_function_t work) { \
SCOPED_TSAN_INTERCEPTOR(name, q, context, work); \
block_context_t *new_context = \
AllocContext(thr, pc, q, context, work); \
new_context->is_barrier_block = barrier; \
Release(thr, pc, (uptr)new_context); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START(); \
REAL(name)(q, new_context, dispatch_callback_wrap); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END(); \
}
#define DISPATCH_INTERCEPT_SYNC_F(name, barrier) \
TSAN_INTERCEPTOR(void, name, dispatch_queue_t q, void *context, \
dispatch_function_t work) { \
SCOPED_TSAN_INTERCEPTOR(name, q, context, work); \
block_context_t new_context = { \
q, context, work, false, true, barrier, 0}; \
Release(thr, pc, (uptr)&new_context); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START(); \
REAL(name)(q, &new_context, dispatch_callback_wrap); \
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END(); \
Acquire(thr, pc, (uptr)&new_context); \
}
#define DISPATCH_INTERCEPT(name, barrier) \
DISPATCH_INTERCEPT_ASYNC_F(name##_async_f, barrier) \
DISPATCH_INTERCEPT_ASYNC_B(name##_async, barrier) \
DISPATCH_INTERCEPT_SYNC_F(name##_sync_f, barrier) \
DISPATCH_INTERCEPT_SYNC_B(name##_sync, barrier)
// We wrap dispatch_async, dispatch_sync and friends where we allocate a new
// context, which is used to synchronize (we release the context before
// submitting, and the callback acquires it before executing the original
// callback).
DISPATCH_INTERCEPT(dispatch, false)
DISPATCH_INTERCEPT(dispatch_barrier, true)
DECLARE_REAL(void, dispatch_after_f, dispatch_time_t when,
dispatch_queue_t queue, void *context, dispatch_function_t work)
TSAN_INTERCEPTOR(void, dispatch_after, dispatch_time_t when,
dispatch_queue_t queue, dispatch_block_t block) {
SCOPED_TSAN_INTERCEPTOR(dispatch_after, when, queue, block);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
dispatch_block_t heap_block = Block_copy(block);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
block_context_t *new_context =
AllocContext(thr, pc, queue, heap_block, &invoke_and_release_block);
Release(thr, pc, (uptr)new_context);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
REAL(dispatch_after_f)(when, queue, new_context, dispatch_callback_wrap);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
}
TSAN_INTERCEPTOR(void, dispatch_after_f, dispatch_time_t when,
dispatch_queue_t queue, void *context,
dispatch_function_t work) {
SCOPED_TSAN_INTERCEPTOR(dispatch_after_f, when, queue, context, work);
WRAP(dispatch_after)(when, queue, ^(void) {
work(context);
});
}
// GCD's dispatch_once implementation has a fast path that contains a racy read
// and it's inlined into user's code. Furthermore, this fast path doesn't
// establish a proper happens-before relations between the initialization and
// code following the call to dispatch_once. We could deal with this in
// instrumented code, but there's not much we can do about it in system
// libraries. Let's disable the fast path (by never storing the value ~0 to
// predicate), so the interceptor is always called, and let's add proper release
// and acquire semantics. Since TSan does not see its own atomic stores, the
// race on predicate won't be reported - the only accesses to it that TSan sees
// are the loads on the fast path. Loads don't race. Secondly, dispatch_once is
// both a macro and a real function, we want to intercept the function, so we
// need to undefine the macro.
#undef dispatch_once
TSAN_INTERCEPTOR(void, dispatch_once, dispatch_once_t *predicate,
DISPATCH_NOESCAPE dispatch_block_t block) {
SCOPED_INTERCEPTOR_RAW(dispatch_once, predicate, block);
atomic_uint32_t *a = reinterpret_cast<atomic_uint32_t *>(predicate);
u32 v = atomic_load(a, memory_order_acquire);
if (v == 0 &&
atomic_compare_exchange_strong(a, &v, 1, memory_order_relaxed)) {
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
block();
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
Release(thr, pc, (uptr)a);
atomic_store(a, 2, memory_order_release);
} else {
while (v != 2) {
internal_sched_yield();
v = atomic_load(a, memory_order_acquire);
}
Acquire(thr, pc, (uptr)a);
}
}
#undef dispatch_once_f
TSAN_INTERCEPTOR(void, dispatch_once_f, dispatch_once_t *predicate,
void *context, dispatch_function_t function) {
SCOPED_INTERCEPTOR_RAW(dispatch_once_f, predicate, context, function);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
WRAP(dispatch_once)(predicate, ^(void) {
function(context);
});
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
}
TSAN_INTERCEPTOR(long_t, dispatch_semaphore_signal,
dispatch_semaphore_t dsema) {
SCOPED_TSAN_INTERCEPTOR(dispatch_semaphore_signal, dsema);
Release(thr, pc, (uptr)dsema);
return REAL(dispatch_semaphore_signal)(dsema);
}
TSAN_INTERCEPTOR(long_t, dispatch_semaphore_wait, dispatch_semaphore_t dsema,
dispatch_time_t timeout) {
SCOPED_TSAN_INTERCEPTOR(dispatch_semaphore_wait, dsema, timeout);
long_t result = REAL(dispatch_semaphore_wait)(dsema, timeout);
if (result == 0) Acquire(thr, pc, (uptr)dsema);
return result;
}
TSAN_INTERCEPTOR(long_t, dispatch_group_wait, dispatch_group_t group,
dispatch_time_t timeout) {
SCOPED_TSAN_INTERCEPTOR(dispatch_group_wait, group, timeout);
long_t result = REAL(dispatch_group_wait)(group, timeout);
if (result == 0) Acquire(thr, pc, (uptr)group);
return result;
}
// Used, but not intercepted.
extern "C" void dispatch_group_enter(dispatch_group_t group);
TSAN_INTERCEPTOR(void, dispatch_group_leave, dispatch_group_t group) {
SCOPED_TSAN_INTERCEPTOR(dispatch_group_leave, group);
// Acquired in the group notification callback in dispatch_group_notify[_f].
Release(thr, pc, (uptr)group);
REAL(dispatch_group_leave)(group);
}
TSAN_INTERCEPTOR(void, dispatch_group_async, dispatch_group_t group,
dispatch_queue_t queue, dispatch_block_t block) {
SCOPED_TSAN_INTERCEPTOR(dispatch_group_async, group, queue, block);
dispatch_retain(group);
dispatch_group_enter(group);
__block dispatch_block_t block_copy = (dispatch_block_t)Block_copy(block);
WRAP(dispatch_async)(queue, ^(void) {
block_copy();
Block_release(block_copy);
WRAP(dispatch_group_leave)(group);
dispatch_release(group);
});
}
TSAN_INTERCEPTOR(void, dispatch_group_async_f, dispatch_group_t group,
dispatch_queue_t queue, void *context,
dispatch_function_t work) {
SCOPED_TSAN_INTERCEPTOR(dispatch_group_async_f, group, queue, context, work);
dispatch_retain(group);
dispatch_group_enter(group);
WRAP(dispatch_async)(queue, ^(void) {
work(context);
WRAP(dispatch_group_leave)(group);
dispatch_release(group);
});
}
DECLARE_REAL(void, dispatch_group_notify_f, dispatch_group_t group,
dispatch_queue_t q, void *context, dispatch_function_t work)
TSAN_INTERCEPTOR(void, dispatch_group_notify, dispatch_group_t group,
dispatch_queue_t q, dispatch_block_t block) {
SCOPED_TSAN_INTERCEPTOR(dispatch_group_notify, group, q, block);
// To make sure the group is still available in the callback (otherwise
// it can be already destroyed). Will be released in the callback.
dispatch_retain(group);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
dispatch_block_t heap_block = Block_copy(^(void) {
{
SCOPED_INTERCEPTOR_RAW(dispatch_read_callback);
// Released when leaving the group (dispatch_group_leave).
Acquire(thr, pc, (uptr)group);
}
dispatch_release(group);
block();
});
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
block_context_t *new_context =
AllocContext(thr, pc, q, heap_block, &invoke_and_release_block);
new_context->is_barrier_block = true;
Release(thr, pc, (uptr)new_context);
REAL(dispatch_group_notify_f)(group, q, new_context, dispatch_callback_wrap);
}
TSAN_INTERCEPTOR(void, dispatch_group_notify_f, dispatch_group_t group,
dispatch_queue_t q, void *context, dispatch_function_t work) {
WRAP(dispatch_group_notify)(group, q, ^(void) { work(context); });
}
TSAN_INTERCEPTOR(void, dispatch_source_set_event_handler,
dispatch_source_t source, dispatch_block_t handler) {
SCOPED_TSAN_INTERCEPTOR(dispatch_source_set_event_handler, source, handler);
if (handler == nullptr)
return REAL(dispatch_source_set_event_handler)(source, nullptr);
dispatch_queue_t q = GetTargetQueueFromSource(source);
__block block_context_t new_context = {
q, handler, &invoke_block, false, false, false, 0 };
dispatch_block_t new_handler = Block_copy(^(void) {
new_context.orig_context = handler; // To explicitly capture "handler".
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
REAL(dispatch_source_set_event_handler)(source, new_handler);
Block_release(new_handler);
}
TSAN_INTERCEPTOR(void, dispatch_source_set_event_handler_f,
dispatch_source_t source, dispatch_function_t handler) {
SCOPED_TSAN_INTERCEPTOR(dispatch_source_set_event_handler_f, source, handler);
if (handler == nullptr)
return REAL(dispatch_source_set_event_handler)(source, nullptr);
dispatch_block_t block = ^(void) {
handler(dispatch_get_context(source));
};
WRAP(dispatch_source_set_event_handler)(source, block);
}
TSAN_INTERCEPTOR(void, dispatch_source_set_cancel_handler,
dispatch_source_t source, dispatch_block_t handler) {
SCOPED_TSAN_INTERCEPTOR(dispatch_source_set_cancel_handler, source, handler);
if (handler == nullptr)
return REAL(dispatch_source_set_cancel_handler)(source, nullptr);
dispatch_queue_t q = GetTargetQueueFromSource(source);
__block block_context_t new_context = {
q, handler, &invoke_block, false, false, false, 0};
dispatch_block_t new_handler = Block_copy(^(void) {
new_context.orig_context = handler; // To explicitly capture "handler".
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
REAL(dispatch_source_set_cancel_handler)(source, new_handler);
Block_release(new_handler);
}
TSAN_INTERCEPTOR(void, dispatch_source_set_cancel_handler_f,
dispatch_source_t source, dispatch_function_t handler) {
SCOPED_TSAN_INTERCEPTOR(dispatch_source_set_cancel_handler_f, source,
handler);
if (handler == nullptr)
return REAL(dispatch_source_set_cancel_handler)(source, nullptr);
dispatch_block_t block = ^(void) {
handler(dispatch_get_context(source));
};
WRAP(dispatch_source_set_cancel_handler)(source, block);
}
TSAN_INTERCEPTOR(void, dispatch_source_set_registration_handler,
dispatch_source_t source, dispatch_block_t handler) {
SCOPED_TSAN_INTERCEPTOR(dispatch_source_set_registration_handler, source,
handler);
if (handler == nullptr)
return REAL(dispatch_source_set_registration_handler)(source, nullptr);
dispatch_queue_t q = GetTargetQueueFromSource(source);
__block block_context_t new_context = {
q, handler, &invoke_block, false, false, false, 0};
dispatch_block_t new_handler = Block_copy(^(void) {
new_context.orig_context = handler; // To explicitly capture "handler".
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
REAL(dispatch_source_set_registration_handler)(source, new_handler);
Block_release(new_handler);
}
TSAN_INTERCEPTOR(void, dispatch_source_set_registration_handler_f,
dispatch_source_t source, dispatch_function_t handler) {
SCOPED_TSAN_INTERCEPTOR(dispatch_source_set_registration_handler_f, source,
handler);
if (handler == nullptr)
return REAL(dispatch_source_set_registration_handler)(source, nullptr);
dispatch_block_t block = ^(void) {
handler(dispatch_get_context(source));
};
WRAP(dispatch_source_set_registration_handler)(source, block);
}
TSAN_INTERCEPTOR(void, dispatch_apply, size_t iterations,
dispatch_queue_t queue,
DISPATCH_NOESCAPE void (^block)(size_t)) {
SCOPED_TSAN_INTERCEPTOR(dispatch_apply, iterations, queue, block);
u8 sync1, sync2;
uptr parent_to_child_sync = (uptr)&sync1;
uptr child_to_parent_sync = (uptr)&sync2;
Release(thr, pc, parent_to_child_sync);
void (^new_block)(size_t) = ^(size_t iteration) {
SCOPED_INTERCEPTOR_RAW(dispatch_apply);
Acquire(thr, pc, parent_to_child_sync);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
block(iteration);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
Release(thr, pc, child_to_parent_sync);
};
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
REAL(dispatch_apply)(iterations, queue, new_block);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
Acquire(thr, pc, child_to_parent_sync);
}
static void invoke_block_iteration(void *param, size_t iteration) {
auto block = (void (^)(size_t)) param;
block(iteration);
}
TSAN_INTERCEPTOR(void, dispatch_apply_f, size_t iterations,
dispatch_queue_t queue, void *context,
void (*work)(void *, size_t)) {
SCOPED_TSAN_INTERCEPTOR(dispatch_apply_f, iterations, queue, context, work);
// Unfortunately, we cannot delegate to dispatch_apply, since libdispatch
// implements dispatch_apply in terms of dispatch_apply_f.
u8 sync1, sync2;
uptr parent_to_child_sync = (uptr)&sync1;
uptr child_to_parent_sync = (uptr)&sync2;
Release(thr, pc, parent_to_child_sync);
void (^new_block)(size_t) = ^(size_t iteration) {
SCOPED_INTERCEPTOR_RAW(dispatch_apply_f);
Acquire(thr, pc, parent_to_child_sync);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
work(context, iteration);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
Release(thr, pc, child_to_parent_sync);
};
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
REAL(dispatch_apply_f)(iterations, queue, new_block, invoke_block_iteration);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
Acquire(thr, pc, child_to_parent_sync);
}
DECLARE_REAL_AND_INTERCEPTOR(void, free, void *ptr)
DECLARE_REAL_AND_INTERCEPTOR(int, munmap, void *addr, long_t sz)
TSAN_INTERCEPTOR(dispatch_data_t, dispatch_data_create, const void *buffer,
size_t size, dispatch_queue_t q, dispatch_block_t destructor) {
SCOPED_TSAN_INTERCEPTOR(dispatch_data_create, buffer, size, q, destructor);
if ((q == nullptr) || (destructor == DISPATCH_DATA_DESTRUCTOR_DEFAULT))
return REAL(dispatch_data_create)(buffer, size, q, destructor);
if (destructor == DISPATCH_DATA_DESTRUCTOR_FREE)
destructor = ^(void) { WRAP(free)((void *)(uintptr_t)buffer); };
else if (destructor == DISPATCH_DATA_DESTRUCTOR_MUNMAP)
destructor = ^(void) { WRAP(munmap)((void *)(uintptr_t)buffer, size); };
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();
dispatch_block_t heap_block = Block_copy(destructor);
SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END();
block_context_t *new_context =
AllocContext(thr, pc, q, heap_block, &invoke_and_release_block);
uptr submit_sync = (uptr)new_context;
Release(thr, pc, submit_sync);
return REAL(dispatch_data_create)(buffer, size, q, ^(void) {
dispatch_callback_wrap(new_context);
});
}
typedef void (^fd_handler_t)(dispatch_data_t data, int error);
typedef void (^cleanup_handler_t)(int error);
TSAN_INTERCEPTOR(void, dispatch_read, dispatch_fd_t fd, size_t length,
dispatch_queue_t q, fd_handler_t h) {
SCOPED_TSAN_INTERCEPTOR(dispatch_read, fd, length, q, h);
__block block_context_t new_context = {
q, nullptr, &invoke_block, false, false, false, 0};
fd_handler_t new_h = Block_copy(^(dispatch_data_t data, int error) {
new_context.orig_context = ^(void) {
h(data, error);
};
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
REAL(dispatch_read)(fd, length, q, new_h);
Block_release(new_h);
}
TSAN_INTERCEPTOR(void, dispatch_write, dispatch_fd_t fd, dispatch_data_t data,
dispatch_queue_t q, fd_handler_t h) {
SCOPED_TSAN_INTERCEPTOR(dispatch_write, fd, data, q, h);
__block block_context_t new_context = {
q, nullptr, &invoke_block, false, false, false, 0};
fd_handler_t new_h = Block_copy(^(dispatch_data_t data, int error) {
new_context.orig_context = ^(void) {
h(data, error);
};
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
REAL(dispatch_write)(fd, data, q, new_h);
Block_release(new_h);
}
TSAN_INTERCEPTOR(void, dispatch_io_read, dispatch_io_t channel, off_t offset,
size_t length, dispatch_queue_t q, dispatch_io_handler_t h) {
SCOPED_TSAN_INTERCEPTOR(dispatch_io_read, channel, offset, length, q, h);
__block block_context_t new_context = {
q, nullptr, &invoke_block, false, false, false, 0};
dispatch_io_handler_t new_h =
Block_copy(^(bool done, dispatch_data_t data, int error) {
new_context.orig_context = ^(void) {
h(done, data, error);
};
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
REAL(dispatch_io_read)(channel, offset, length, q, new_h);
Block_release(new_h);
}
TSAN_INTERCEPTOR(void, dispatch_io_write, dispatch_io_t channel, off_t offset,
dispatch_data_t data, dispatch_queue_t q,
dispatch_io_handler_t h) {
SCOPED_TSAN_INTERCEPTOR(dispatch_io_write, channel, offset, data, q, h);
__block block_context_t new_context = {
q, nullptr, &invoke_block, false, false, false, 0};
dispatch_io_handler_t new_h =
Block_copy(^(bool done, dispatch_data_t data, int error) {
new_context.orig_context = ^(void) {
h(done, data, error);
};
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
REAL(dispatch_io_write)(channel, offset, data, q, new_h);
Block_release(new_h);
}
TSAN_INTERCEPTOR(void, dispatch_io_barrier, dispatch_io_t channel,
dispatch_block_t barrier) {
SCOPED_TSAN_INTERCEPTOR(dispatch_io_barrier, channel, barrier);
__block block_context_t new_context = {
nullptr, nullptr, &invoke_block, false, false, false, 0};
new_context.non_queue_sync_object = (uptr)channel;
new_context.is_barrier_block = true;
dispatch_block_t new_block = Block_copy(^(void) {
new_context.orig_context = ^(void) {
barrier();
};
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
REAL(dispatch_io_barrier)(channel, new_block);
Block_release(new_block);
}
TSAN_INTERCEPTOR(dispatch_io_t, dispatch_io_create, dispatch_io_type_t type,
dispatch_fd_t fd, dispatch_queue_t q, cleanup_handler_t h) {
SCOPED_TSAN_INTERCEPTOR(dispatch_io_create, type, fd, q, h);
__block dispatch_io_t new_channel = nullptr;
__block block_context_t new_context = {
q, nullptr, &invoke_block, false, false, false, 0};
cleanup_handler_t new_h = Block_copy(^(int error) {
{
SCOPED_INTERCEPTOR_RAW(dispatch_io_create_callback);
Acquire(thr, pc, (uptr)new_channel); // Release() in dispatch_io_close.
}
new_context.orig_context = ^(void) {
h(error);
};
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
new_channel = REAL(dispatch_io_create)(type, fd, q, new_h);
Block_release(new_h);
return new_channel;
}
TSAN_INTERCEPTOR(dispatch_io_t, dispatch_io_create_with_path,
dispatch_io_type_t type, const char *path, int oflag,
mode_t mode, dispatch_queue_t q, cleanup_handler_t h) {
SCOPED_TSAN_INTERCEPTOR(dispatch_io_create_with_path, type, path, oflag, mode,
q, h);
__block dispatch_io_t new_channel = nullptr;
__block block_context_t new_context = {
q, nullptr, &invoke_block, false, false, false, 0};
cleanup_handler_t new_h = Block_copy(^(int error) {
{
SCOPED_INTERCEPTOR_RAW(dispatch_io_create_callback);
Acquire(thr, pc, (uptr)new_channel); // Release() in dispatch_io_close.
}
new_context.orig_context = ^(void) {
h(error);
};
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
new_channel =
REAL(dispatch_io_create_with_path)(type, path, oflag, mode, q, new_h);
Block_release(new_h);
return new_channel;
}
TSAN_INTERCEPTOR(dispatch_io_t, dispatch_io_create_with_io,
dispatch_io_type_t type, dispatch_io_t io, dispatch_queue_t q,
cleanup_handler_t h) {
SCOPED_TSAN_INTERCEPTOR(dispatch_io_create_with_io, type, io, q, h);
__block dispatch_io_t new_channel = nullptr;
__block block_context_t new_context = {
q, nullptr, &invoke_block, false, false, false, 0};
cleanup_handler_t new_h = Block_copy(^(int error) {
{
SCOPED_INTERCEPTOR_RAW(dispatch_io_create_callback);
Acquire(thr, pc, (uptr)new_channel); // Release() in dispatch_io_close.
}
new_context.orig_context = ^(void) {
h(error);
};
dispatch_callback_wrap(&new_context);
});
uptr submit_sync = (uptr)&new_context;
Release(thr, pc, submit_sync);
new_channel = REAL(dispatch_io_create_with_io)(type, io, q, new_h);
Block_release(new_h);
return new_channel;
}
TSAN_INTERCEPTOR(void, dispatch_io_close, dispatch_io_t channel,
dispatch_io_close_flags_t flags) {
SCOPED_TSAN_INTERCEPTOR(dispatch_io_close, channel, flags);
Release(thr, pc, (uptr)channel); // Acquire() in dispatch_io_create[_*].
return REAL(dispatch_io_close)(channel, flags);
}
// Resuming a suspended queue needs to synchronize with all subsequent
// executions of blocks in that queue.
TSAN_INTERCEPTOR(void, dispatch_resume, dispatch_object_t o) {
SCOPED_TSAN_INTERCEPTOR(dispatch_resume, o);
Release(thr, pc, (uptr)o); // Synchronizes with the Acquire() on serial_sync
// in dispatch_sync_pre_execute
return REAL(dispatch_resume)(o);
}
void InitializeLibdispatchInterceptors() {
INTERCEPT_FUNCTION(dispatch_async);
INTERCEPT_FUNCTION(dispatch_async_f);
INTERCEPT_FUNCTION(dispatch_sync);
INTERCEPT_FUNCTION(dispatch_sync_f);
INTERCEPT_FUNCTION(dispatch_barrier_async);
INTERCEPT_FUNCTION(dispatch_barrier_async_f);
INTERCEPT_FUNCTION(dispatch_barrier_sync);
INTERCEPT_FUNCTION(dispatch_barrier_sync_f);
INTERCEPT_FUNCTION(dispatch_after);
INTERCEPT_FUNCTION(dispatch_after_f);
INTERCEPT_FUNCTION(dispatch_once);
INTERCEPT_FUNCTION(dispatch_once_f);
INTERCEPT_FUNCTION(dispatch_semaphore_signal);
INTERCEPT_FUNCTION(dispatch_semaphore_wait);
INTERCEPT_FUNCTION(dispatch_group_wait);
INTERCEPT_FUNCTION(dispatch_group_leave);
INTERCEPT_FUNCTION(dispatch_group_async);
INTERCEPT_FUNCTION(dispatch_group_async_f);
INTERCEPT_FUNCTION(dispatch_group_notify);
INTERCEPT_FUNCTION(dispatch_group_notify_f);
INTERCEPT_FUNCTION(dispatch_source_set_event_handler);
INTERCEPT_FUNCTION(dispatch_source_set_event_handler_f);
INTERCEPT_FUNCTION(dispatch_source_set_cancel_handler);
INTERCEPT_FUNCTION(dispatch_source_set_cancel_handler_f);
INTERCEPT_FUNCTION(dispatch_source_set_registration_handler);
INTERCEPT_FUNCTION(dispatch_source_set_registration_handler_f);
INTERCEPT_FUNCTION(dispatch_apply);
INTERCEPT_FUNCTION(dispatch_apply_f);
INTERCEPT_FUNCTION(dispatch_data_create);
INTERCEPT_FUNCTION(dispatch_read);
INTERCEPT_FUNCTION(dispatch_write);
INTERCEPT_FUNCTION(dispatch_io_read);
INTERCEPT_FUNCTION(dispatch_io_write);
INTERCEPT_FUNCTION(dispatch_io_barrier);
INTERCEPT_FUNCTION(dispatch_io_create);
INTERCEPT_FUNCTION(dispatch_io_create_with_path);
INTERCEPT_FUNCTION(dispatch_io_create_with_io);
INTERCEPT_FUNCTION(dispatch_io_close);
INTERCEPT_FUNCTION(dispatch_resume);
}
} // namespace __tsan