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Message-ID: <3db9f87f0711300409o7c760c53r7f1b5a5ec66ba8e8@mail.gmail.com>
Date: Fri, 30 Nov 2007 20:09:37 +0800
From: "Simon Chow" <simon.harmony@gmail.com>
To: dev@harmony.apache.org
Subject: Re: [drlvm][gc] initialization of global var: tm_self_tls
In-Reply-To: <0vqprxs2gkl.fsf@gmail.com>
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References: <3db9f87f0711292321y4217b4dbh38865c41d5a4f717@mail.gmail.com>
	 <0vqprxs2gkl.fsf@gmail.com>

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Thanks for that, I considered it as a global variable as well
but when I step into
hy_inline hythread_t VMCALL hythread_self() {
     return tm_self_tls;
}
I found this


gc_get_tls () at
/home/zhouxun/workspace/Harmony/trunk/working_vm/vm/gc_gen/src/thread/gc_thread.h:35
35        void* tls_base = vm_thread_local();
(gdb) s
vm_thread_local () at
/home/zhouxun/workspace/Harmony/trunk/working_vm/vm/gc_gen/src/thread/../common/gc_platform.h:107
107     {  return hythread_self();  }
(gdb) s
hythread_self () at
/home/zhouxun/workspace/Harmony/trunk/working_vm/vm/include/open/hythread.h:515
515         return tm_self_tls;
(gdb) display /i $pc // I do not know where the asm codes below come from
1: x/i $pc  0xb679a513 <hythread_self+15>:      lea
0xffffff80(,%ebx,1),%eax
(gdb) si
0xb679a51a      515         return tm_self_tls;
1: x/i $pc  0xb679a51a <hythread_self+22>:      call   0xb677985c
<___tls_get_addr@plt>
(gdb)
0xb677985c in ___tls_get_addr@plt () from
/home/zhouxun/workspace/Harmony/trunk/working_vm/build/deploy/jdk/jre/bin/default/libgc_gen.so
1: x/i $pc  0xb677985c <___tls_get_addr@plt>:   jmp    *0xb0(%ebx)
(gdb)
0xb7fb1e50 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e50 <___tls_get_addr>:       push   %ebp
(gdb)
0xb7fb1e51 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e51 <___tls_get_addr+1>:     mov    %esp,%ebp
(gdb)
0xb7fb1e53 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e53 <___tls_get_addr+3>:     sub    $0x28,%esp
(gdb)
0xb7fb1e56 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e56 <___tls_get_addr+6>:     mov    %ebx,0xfffffff4(%ebp)
(gdb)
0xb7fb1e59 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e59 <___tls_get_addr+9>:     mov    %esi,0xfffffff8(%ebp)
(gdb)
0xb7fb1e5c in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e5c <___tls_get_addr+12>:    mov    %edi,0xfffffffc(%ebp)
(gdb)
0xb7fb1e5f in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e5f <___tls_get_addr+15>:    call   0xb7fb6cfb
<icudt34_dat+23157435>
(gdb)
0xb7fb6cfb in ?? () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb6cfb <icudt34_dat+23157435>:  mov    (%esp),%ebx
(gdb)
0xb7fb6cfe in ?? () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb6cfe <icudt34_dat+23157438>:  ret
(gdb)
0xb7fb1e64 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e64 <___tls_get_addr+20>:    add    $0xa190,%ebx
(gdb)
0xb7fb1e6a in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e6a <___tls_get_addr+26>:    mov    %eax,0xffffffe4(%ebp)
(gdb)
0xb7fb1e6d in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e6d <___tls_get_addr+29>:    mov    %gs:0x4,%esi
(gdb)
0xb7fb1e74 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e74 <___tls_get_addr+36>:    mov    (%esi),%eax
(gdb)
0xb7fb1e76 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e76 <___tls_get_addr+38>:    cmp    0x628(%ebx),%eax
(gdb)
0xb7fb1e7c in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e7c <___tls_get_addr+44>:    movl   $0x0,0xffffffec(%ebp)
(gdb)
0xb7fb1e83 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e83 <___tls_get_addr+51>:    jne    0xb7fb1eac
<___tls_get_addr+92>
(gdb)
0xb7fb1e85 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e85 <___tls_get_addr+53>:    mov    0xffffffe4(%ebp),%eax
(gdb)
0xb7fb1e88 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e88 <___tls_get_addr+56>:    mov    (%eax),%edx
(gdb)
0xb7fb1e8a in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e8a <___tls_get_addr+58>:    lea    (%esi,%edx,8),%eax
(gdb)
0xb7fb1e8d in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e8d <___tls_get_addr+61>:    mov    %eax,0xffffffe8(%ebp)
(gdb)
0xb7fb1e90 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e90 <___tls_get_addr+64>:    mov    (%eax),%edi
(gdb)
0xb7fb1e92 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e92 <___tls_get_addr+66>:    cmp    $0xffffffff,%edi
(gdb)
0xb7fb1e95 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e95 <___tls_get_addr+69>:    je     0xb7fb1ebe
<___tls_get_addr+110>
(gdb)
0xb7fb1e97 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e97 <___tls_get_addr+71>:    mov    0xffffffe4(%ebp),%eax
(gdb)
0xb7fb1e9a in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e9a <___tls_get_addr+74>:    mov    0xfffffff4(%ebp),%ebx
(gdb)
0xb7fb1e9d in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1e9d <___tls_get_addr+77>:    mov    0xfffffff8(%ebp),%esi
(gdb)
0xb7fb1ea0 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1ea0 <___tls_get_addr+80>:    add    0x4(%eax),%edi
(gdb)
0xb7fb1ea3 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1ea3 <___tls_get_addr+83>:    mov    %edi,%eax
(gdb)
0xb7fb1ea5 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1ea5 <___tls_get_addr+85>:    mov    0xfffffffc(%ebp),%edi
(gdb)
0xb7fb1ea8 in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1ea8 <___tls_get_addr+88>:    mov    %ebp,%esp
(gdb)
0xb7fb1eaa in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1eaa <___tls_get_addr+90>:    pop    %ebp
(gdb)
0xb7fb1eab in ___tls_get_addr () from /lib/ld-linux.so.2
1: x/i $pc  0xb7fb1eab <___tls_get_addr+91>:    ret //until here, the
function hythread_self() in vm/include/open/hythread.h finishes
(gdb)
0xb679a51f in hythread_self () at
/home/zhouxun/workspace/Harmony/trunk/working_vm/vm/include/open/hythread.h:515
515         return tm_self_tls;
1: x/i $pc  0xb679a51f <hythread_self+27>:      mov    (%eax),%eax
(gdb)


On 30 Nov 2007 13:06:18 +0300, Egor Pasko <egor.pasko@gmail.com> wrote:
>
> On the 0x39E day of Apache Harmony Simon Chow wrote:
> > I am studying Harmony DRLVM code as a beginner.
> > When I was debugging the gc module,
> > This method:
> > hy_inline hythread_t VMCALL hythread_self() {
> >     return tm_self_tls;
> > }
> > in hythread.h:515 is called frequenctly
> >
> > But I am not sure whether tm_self_tls is a global var or a macro defined
> in
> > other file.
>
> I see only one file, where tm_self_tls is defined --
> vm/include/open/hythread.h And it is defined to be a variable that
> resides in Thread Local Storage. AFAIR, it stores a pointer to a
> structure HyThread_public that stores thread state.
>
> > I tried to use "si" of gdb before this method returned, but it seem go
> to
> > some asm code without source information.
> >
> > I am confused here.
> >
> > --
> > From : Simon.Chow@Software School of Fudan University
>
> --
> Egor Pasko
>
>


-- 
>From : Simon.Chow@Software School of Fudan University

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