You can change the configure script. I don't know if there's any
concerns with using libiberty.a. That's possibly a legal question (GNU
GPL). You might want to ask that on jdk-dev and/or build-dev.
Chris
On 10/30/19 7:14 PM, Yasumasa Suenaga wrote:
Hi Chris,
Thanks for quick reply!
If we convert LinuxDebuggerLocal.c to C++ code, we have to convert a
lot of JNI calls to C++ style.
For example:
(*env)->FindClass(env, "java/lang/String")
to
env->FindClass("java/lang/String")
Can it be accepted?
OTOH I said in my email, to use cplus_demangle(), we need to link
libiberty.a which is provided by binutils. Thus I think we need to
check libiberty.a in configure script. Is it ok?
I prefer to use cplus_demangle() if we can change configure script.
Yasumasa
On 2019/10/31 11:03, Chris Plummer wrote:
Hi Yasumasa,
I don't have concerns with adding C++ source to SA, but in order to
do so you've put the new native code in its own file rather than in
LinuxDebuggerLocal.c. I'd like to see that resolved. So either
convert LinuxDebuggerLocal.c to C++, or use cplus_demangle().
thanks,
Chris
On 10/30/19 6:54 PM, Yasumasa Suenaga wrote:
Hi all,
I saw C++ frames in `jhsdb jstack --mixed`, and they were mangled as
below:
0x00007ff255a8fa4c
_ZN9JavaCalls11call_helperEP9JavaValueRK12methodHandleP17JavaCallArgumentsP6Thread
+ 0x6ac
0x00007ff255a8cc1d
_ZN9JavaCalls12call_virtualEP9JavaValueP5KlassP6SymbolS5_P17JavaCallArgumentsP6Thread
+ 0x33d
We can demangle them via c++filt, but I think it is more convenience
if jstack can show demangling symbols.
I think we can demangle in jstack with this patch. If it is
accepted, I will file it to JBS and send review request.
What do you think?
http://cr.openjdk.java.net/~ysuenaga/sa-demangle/
We can get the stack as below after applying this patch:
0x00007ff1aba20a4c JavaCalls::call_helper(JavaValue*,
methodHandle const&, JavaCallArguments*, Thread*) + 0x6ac
0x00007ff1aba1dc1d JavaCalls::call_virtual(JavaValue*, Klass*,
Symbol*, Symbol*, JavaCallArguments*, Thread*) + 0x33d
I use abi::__cxa_demangle() for demangling, so this patch adds C++
source to SA.
If it is not comfortable, we can use cplus_demangle().
But this function is provided by libiberty.a, so we need to link it
to libsaproc and need to check libiberty.a in configure script.
Thanks,
Yasumasa
