【移动应用开发技术】解决Android Native内存泄漏系统化的示例分析

【移动应用开发技术】解决AndroidNative内存泄漏系统化的示例分析

一、栈回溯加速/upload/information/20200623/125/118061.jpgtypedef

struct

{

void*

stack[MAX_TRACE_DEEP];

int

current;

}

thread_stack_t;static

pthread_once_t

sBackTraceOnce

=

PTHREAD_ONCE_INIT;

static

void

__attribute__((no_instrument_function))

destructor(void*

ptr)

{

if

(ptr)

{

free(ptr);

}

}

static

void

__attribute__((no_instrument_function))

init_once(void)

{

pthread_key_create(&sBackTraceKey,

destructor);

}get_backtrace_info()

{

thread_stack_t*

ptr

=

(thread_stack_t*)

pthread_getspecific(sBackTraceKey);

if

(ptr)

return

ptr;

ptr

=

(thread_stack_t*)malloc(sizeof(thread_stack_t));

ptr->current

=

MAX_TRACE_DEEP

-

1;

pthread_setspecific(sBackTraceKey,

ptr);

return

ptr;

}void

__attribute__((no_instrument_function))

__cyg_profile_func_enter(void*

this_func,

void*

call_site)

{

pthread_once(&sBackTraceOnce,

init_once);

thread_stack_t*

ptr

=

get_backtrace_info();

if

(ptr->current

>

0)

ptr->stack[ptr->current--]

=

(void*)((long)call_site

-

4);

}

void

__attribute__((no_instrument_function))

__cyg_profile_func_exit(void*

this_func,

void*

call_site)

{

pthread_once(&sBackTraceOnce,

init_once);

thread_stack_t*

ptr

=

get_backtrace_info();

if

(++ptr->current

>=

MAX_TRACE_DEEP)

ptr->current

=

MAX_TRACE_DEEP

-

1;

}

}/upload/information/20200623/125/118062.jpgget_tls_backtrace(void**

backtrace,

int

max)

{

pthread_once(&sBackTraceOnce,

init_once);

int

count

=

max;

thread_stack_t*

ptr

=

get_backtrace_info();

if

(MAX_TRACE_DEEP

-

1

-

ptr->current

<

count)

{

count

=

MAX_TRACE_DEEP

-

1

-

ptr->current;

}

if

(count

>

0)

{

memcpy(backtrace,

&ptr->stack[ptr->current

+

1],

sizeof(void

*)

*

count);

}

return

count;

}/upload/information/20200623/125/118063.jpg/upload/information/20200623/125/118064.jpg/upload/information/20200623/125/118065.jpg/upload/information/20200623/125/118066.jpg二、体系化/upload/information/20200