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191 lines
6.7 KiB
C++
191 lines
6.7 KiB
C++
//===-- lsan_mac.cc -------------------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of LeakSanitizer, a memory leak checker.
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//
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// Mac-specific details.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_MAC
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#include "interception/interception.h"
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#include "lsan.h"
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#include "lsan_allocator.h"
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#include "lsan_thread.h"
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#include <pthread.h>
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namespace __lsan {
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// Support for the following functions from libdispatch on Mac OS:
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// dispatch_async_f()
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// dispatch_async()
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// dispatch_sync_f()
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// dispatch_sync()
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// dispatch_after_f()
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// dispatch_after()
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// dispatch_group_async_f()
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// dispatch_group_async()
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// TODO(glider): libdispatch API contains other functions that we don't support
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// yet.
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//
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// dispatch_sync() and dispatch_sync_f() are synchronous, although chances are
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// they can cause jobs to run on a thread different from the current one.
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// TODO(glider): if so, we need a test for this (otherwise we should remove
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// them).
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//
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// The following functions use dispatch_barrier_async_f() (which isn't a library
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// function but is exported) and are thus supported:
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// dispatch_source_set_cancel_handler_f()
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// dispatch_source_set_cancel_handler()
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// dispatch_source_set_event_handler_f()
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// dispatch_source_set_event_handler()
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//
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// The reference manual for Grand Central Dispatch is available at
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// http://developer.apple.com/library/mac/#documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html
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// The implementation details are at
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// http://libdispatch.macosforge.org/trac/browser/trunk/src/queue.c
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typedef void *dispatch_group_t;
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typedef void *dispatch_queue_t;
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typedef void *dispatch_source_t;
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typedef u64 dispatch_time_t;
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typedef void (*dispatch_function_t)(void *block);
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typedef void *(*worker_t)(void *block);
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// A wrapper for the ObjC blocks used to support libdispatch.
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typedef struct {
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void *block;
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dispatch_function_t func;
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u32 parent_tid;
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} lsan_block_context_t;
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ALWAYS_INLINE
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void lsan_register_worker_thread(int parent_tid) {
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if (GetCurrentThread() == kInvalidTid) {
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u32 tid = ThreadCreate(parent_tid, 0, true);
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ThreadStart(tid, GetTid());
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SetCurrentThread(tid);
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}
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}
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// For use by only those functions that allocated the context via
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// alloc_lsan_context().
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extern "C" void lsan_dispatch_call_block_and_release(void *block) {
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lsan_block_context_t *context = (lsan_block_context_t *)block;
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VReport(2,
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"lsan_dispatch_call_block_and_release(): "
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"context: %p, pthread_self: %p\n",
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block, pthread_self());
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lsan_register_worker_thread(context->parent_tid);
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// Call the original dispatcher for the block.
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context->func(context->block);
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lsan_free(context);
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}
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} // namespace __lsan
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using namespace __lsan; // NOLINT
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// Wrap |ctxt| and |func| into an lsan_block_context_t.
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// The caller retains control of the allocated context.
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extern "C" lsan_block_context_t *alloc_lsan_context(void *ctxt,
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dispatch_function_t func) {
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GET_STACK_TRACE_THREAD;
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lsan_block_context_t *lsan_ctxt =
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(lsan_block_context_t *)lsan_malloc(sizeof(lsan_block_context_t), stack);
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lsan_ctxt->block = ctxt;
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lsan_ctxt->func = func;
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lsan_ctxt->parent_tid = GetCurrentThread();
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return lsan_ctxt;
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}
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// Define interceptor for dispatch_*_f function with the three most common
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// parameters: dispatch_queue_t, context, dispatch_function_t.
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#define INTERCEPT_DISPATCH_X_F_3(dispatch_x_f) \
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INTERCEPTOR(void, dispatch_x_f, dispatch_queue_t dq, void *ctxt, \
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dispatch_function_t func) { \
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lsan_block_context_t *lsan_ctxt = alloc_lsan_context(ctxt, func); \
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return REAL(dispatch_x_f)(dq, (void *)lsan_ctxt, \
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lsan_dispatch_call_block_and_release); \
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}
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INTERCEPT_DISPATCH_X_F_3(dispatch_async_f)
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INTERCEPT_DISPATCH_X_F_3(dispatch_sync_f)
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INTERCEPT_DISPATCH_X_F_3(dispatch_barrier_async_f)
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INTERCEPTOR(void, dispatch_after_f, dispatch_time_t when, dispatch_queue_t dq,
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void *ctxt, dispatch_function_t func) {
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lsan_block_context_t *lsan_ctxt = alloc_lsan_context(ctxt, func);
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return REAL(dispatch_after_f)(when, dq, (void *)lsan_ctxt,
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lsan_dispatch_call_block_and_release);
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}
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INTERCEPTOR(void, dispatch_group_async_f, dispatch_group_t group,
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dispatch_queue_t dq, void *ctxt, dispatch_function_t func) {
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lsan_block_context_t *lsan_ctxt = alloc_lsan_context(ctxt, func);
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REAL(dispatch_group_async_f)
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(group, dq, (void *)lsan_ctxt, lsan_dispatch_call_block_and_release);
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}
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#if !defined(MISSING_BLOCKS_SUPPORT)
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extern "C" {
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void dispatch_async(dispatch_queue_t dq, void (^work)(void));
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void dispatch_group_async(dispatch_group_t dg, dispatch_queue_t dq,
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void (^work)(void));
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void dispatch_after(dispatch_time_t when, dispatch_queue_t queue,
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void (^work)(void));
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void dispatch_source_set_cancel_handler(dispatch_source_t ds,
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void (^work)(void));
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void dispatch_source_set_event_handler(dispatch_source_t ds,
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void (^work)(void));
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}
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#define GET_LSAN_BLOCK(work) \
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void (^lsan_block)(void); \
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int parent_tid = GetCurrentThread(); \
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lsan_block = ^(void) { \
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lsan_register_worker_thread(parent_tid); \
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work(); \
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}
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INTERCEPTOR(void, dispatch_async, dispatch_queue_t dq, void (^work)(void)) {
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GET_LSAN_BLOCK(work);
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REAL(dispatch_async)(dq, lsan_block);
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}
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INTERCEPTOR(void, dispatch_group_async, dispatch_group_t dg,
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dispatch_queue_t dq, void (^work)(void)) {
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GET_LSAN_BLOCK(work);
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REAL(dispatch_group_async)(dg, dq, lsan_block);
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}
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INTERCEPTOR(void, dispatch_after, dispatch_time_t when, dispatch_queue_t queue,
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void (^work)(void)) {
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GET_LSAN_BLOCK(work);
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REAL(dispatch_after)(when, queue, lsan_block);
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}
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INTERCEPTOR(void, dispatch_source_set_cancel_handler, dispatch_source_t ds,
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void (^work)(void)) {
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if (!work) {
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REAL(dispatch_source_set_cancel_handler)(ds, work);
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return;
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}
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GET_LSAN_BLOCK(work);
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REAL(dispatch_source_set_cancel_handler)(ds, lsan_block);
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}
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INTERCEPTOR(void, dispatch_source_set_event_handler, dispatch_source_t ds,
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void (^work)(void)) {
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GET_LSAN_BLOCK(work);
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REAL(dispatch_source_set_event_handler)(ds, lsan_block);
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}
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#endif
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#endif // SANITIZER_MAC
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