On 04/10/2018 08:32 PM, Wuweijia wrote:
Hi John：
I follow your instruction that upgrade the valgrind from 3.12 to 3.13.
It seem to be okay, Thank you. I did not find any change in the vg_preload.c
vg_redir.c . Can you tell me why the error do not occur.
But there is some mistake, I still need to find out why.
I run the aarch64 Application, with valgrind 3.13..
It show me this error:
==23233== Mismatched free() / delete / delete []
==23233== at 0x582144C: operator delete[](void*) (vg_replace_malloc.c:620)
==23233== by 0x531351B: android::List<android::sp<android::IVPBuffer>
>::~List() (List.h:174)
==23233== Address 0x4ae91c0 is 0 bytes inside a block of size 24 alloc'd
==23233== at 0x582082C: operator new(unsigned long)
(vg_replace_malloc.c:333)----------------show me I call new() function not
new[]
==23233== by 0x531349F: android::List<android::sp<android::IVPBuffer>
>::prep() (List.h:294)
And then I objdump the so , the machine code show me as below:
000000000000446c <android::List<android::sp<android::IVPBuffer> >::prep()>:
_ZN7android4ListINS_2spINS_9IVPBufferEEEE4prepEv():
system/core/libutils/include/utils/List.h:293
446c: d10083ff sub sp, sp, #0x20
4470: a9017bfd stp x29, x30, [sp,#16]
4474: 910043fd add x29, sp, #0x10
4478: b27d07e8 orr x8, xzr, #0x18
447c: f90007e0 str x0, [sp,#8]
4480: f94007e0 ldr x0, [sp,#8]
system/core/libutils/include/utils/List.h:294
4484: f90003e0 str x0, [sp]
4488: aa0803e0 mov x0, x8
448c: 97fffb8b bl 32b8 <operator new[](unsigned
long)@plt> -------------------It show me I used the new[] function not the
new(),but valgrind show me I used the new()
Now we need to see the details of the redirections that valgrind performs:
intercepting calls to 'operator new' and 'operator new[]',
and calling their replacements in vg_replace_malloc.c instead.
Please run
valgrind -v ./my_app
and report the REDIR lines, such as:
--9315-- REDIR: 0x4ec9b40 (libstdc++.so.6:operator new[](unsigned long))
redirected to 0x4c2e87b (operator new[](unsigned long))
We want to see if both 'operator new' and 'operator new[]' are intercepted
separately.
Also, please show the difference between the address of the 'operator new'
subroutine
and the address of the 'operator new[]' subroutine. There may be low-level
optimizations
where 'operator new[]' tail merges into 'opeartor new' such that it is difficult
to track the difference.
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