[LLVMdev] Getting the Debugging JIT-ed Code with GDB example to work
Keno Fischer
kfischer at college.harvard.edu
Tue Mar 25 21:41:14 PDT 2014
That bug was fixed this January in r199350, so you may need to update LLVM.
On Tue, Mar 25, 2014 at 9:44 PM, Zach Devito <zdevito at stanford.edu> wrote:
> I tested it with the symbols enabled for lli and it still doesn't work.
> Below is the assembly for GDBJITRegistrar::registerObject containing the
> inlined body of NotifyDebugger. It looks like the call to
> __jit_debug_register_code was inlined away despite being marked with
> LLVM_ATTRIBUTE_NOINLINE. LLVM was compiled with the following GCC:
>
> zdevito at derp:~/terra/tests$ gcc --version
>> gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
>> Copyright (C) 2011 Free Software Foundation, Inc.
>> This is free software; see the source for copying conditions. There is NO
>> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
>> PURPOSE.
>
>
> Maybe the LLVM_ATTRIBUTE_NOINLINE macro is defined wrong, or the compiler
> is ignoring it?
>
> Zach
>
>
> Dump of assembler code for function (anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&):
>> 0x0000000000b1eba0 <+0>: push rbp
>> 0x0000000000b1eba1 <+1>: push r15
>> 0x0000000000b1eba3 <+3>: push r14
>> 0x0000000000b1eba5 <+5>: push r13
>> 0x0000000000b1eba7 <+7>: push r12
>> 0x0000000000b1eba9 <+9>: push rbx
>> 0x0000000000b1ebaa <+10>: sub rsp,0x28
>> 0x0000000000b1ebae <+14>: mov r14,rdi
>> 0x0000000000b1ebb1 <+17>: mov rax,QWORD PTR [rsi+0x8]
>> 0x0000000000b1ebb5 <+21>: mov r13,QWORD PTR [rax+0x8]
>> 0x0000000000b1ebb9 <+25>: mov QWORD PTR [rsp+0x8],r13
>> 0x0000000000b1ebbe <+30>: test r13,r13
>> 0x0000000000b1ebc1 <+33>: je 0xb1edcf <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+559>
>> 0x0000000000b1ebc7 <+39>: mov rax,QWORD PTR [rax+0x10]
>> 0x0000000000b1ebcb <+43>: sub rax,r13
>> 0x0000000000b1ebce <+46>: mov QWORD PTR [rsp],rax
>> 0x0000000000b1ebd2 <+50>: mov r15,QWORD PTR [r14+0x8]
>> 0x0000000000b1ebd6 <+54>: mov ebp,DWORD PTR [r14+0x18]
>> 0x0000000000b1ebda <+58>: add r14,0x8
>> 0x0000000000b1ebde <+62>: test rbp,rbp
>> 0x0000000000b1ebe1 <+65>: je 0xb1ec3f <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+159>
>> 0x0000000000b1ebe3 <+67>: mov rax,r13
>> 0x0000000000b1ebe6 <+70>: or rax,0x4
>> 0x0000000000b1ebea <+74>: cmp rax,0xfffffffffffffffc
>> 0x0000000000b1ebee <+78>: je 0xb1ee1e <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+638>
>> 0x0000000000b1ebf4 <+84>: mov ecx,r13d
>> 0x0000000000b1ebf7 <+87>: shr ecx,0x9
>> 0x0000000000b1ebfa <+90>: mov eax,r13d
>> 0x0000000000b1ebfd <+93>: shr eax,0x4
>> 0x0000000000b1ec00 <+96>: xor eax,ecx
>> 0x0000000000b1ec02 <+98>: lea ecx,[rbp-0x1]
>> 0x0000000000b1ec05 <+101>: and eax,ecx
>> 0x0000000000b1ec07 <+103>: lea rdx,[rax+rax*2]
>> 0x0000000000b1ec0b <+107>: mov rsi,QWORD PTR [r15+rdx*8]
>> 0x0000000000b1ec0f <+111>: cmp r13,rsi
>> 0x0000000000b1ec12 <+114>: je 0xb1ec4a <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+170>
>> 0x0000000000b1ec14 <+116>: mov edx,0x1
>> 0x0000000000b1ec19 <+121>: nop DWORD PTR [rax+0x0]
>> 0x0000000000b1ec20 <+128>: cmp rsi,0xfffffffffffffffc
>> 0x0000000000b1ec24 <+132>: je 0xb1ec3f <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+159>
>> 0x0000000000b1ec26 <+134>: add eax,edx
>> 0x0000000000b1ec28 <+136>: and eax,ecx
>> 0x0000000000b1ec2a <+138>: lea rdi,[rax+rax*2]
>> 0x0000000000b1ec2e <+142>: mov rsi,QWORD PTR [r15+rdi*8]
>> 0x0000000000b1ec32 <+146>: inc edx
>> 0x0000000000b1ec34 <+148>: cmp r13,rsi
>> 0x0000000000b1ec37 <+151>: jne 0xb1ec20 <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+128>
>> 0x0000000000b1ec39 <+153>: lea rax,[r15+rdi*8]
>> 0x0000000000b1ec3d <+157>: jmp 0xb1ec4e <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+174>
>> 0x0000000000b1ec3f <+159>: lea rax,[rbp+rbp*2+0x0]
>> 0x0000000000b1ec44 <+164>: lea rax,[r15+rax*8]
>> 0x0000000000b1ec48 <+168>: jmp 0xb1ec4e <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+174>
>> 0x0000000000b1ec4a <+170>: lea rax,[r15+rdx*8]
>> 0x0000000000b1ec4e <+174>: lea rcx,[rbp+rbp*2+0x0]
>> 0x0000000000b1ec53 <+179>: lea rcx,[r15+rcx*8]
>> 0x0000000000b1ec57 <+183>: cmp rax,rcx
>> 0x0000000000b1ec5a <+186>: jne 0xb1edee <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+590>
>> 0x0000000000b1ec60 <+192>: mov edi,0x20
>> 0x0000000000b1ec65 <+197>: call 0x4e8120 <_Znwm at plt>
>> 0x0000000000b1ec6a <+202>: mov r12,rax
>> 0x0000000000b1ec6d <+205>: mov QWORD PTR [r12+0x18],0x0
>> 0x0000000000b1ec76 <+214>: mov QWORD PTR [r12+0x10],0x0
>> 0x0000000000b1ec7f <+223>: mov QWORD PTR [r12+0x8],0x0
>> 0x0000000000b1ec88 <+232>: mov QWORD PTR [r12],0x0
>> 0x0000000000b1ec90 <+240>: test r12,r12
>> 0x0000000000b1ec93 <+243>: je 0xb1ee0d <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+621>
>> 0x0000000000b1ec99 <+249>: mov QWORD PTR [r12+0x10],r13
>> 0x0000000000b1ec9e <+254>: mov rax,QWORD PTR [rsp]
>> 0x0000000000b1eca2 <+258>: mov QWORD PTR [r12+0x18],rax
>> 0x0000000000b1eca7 <+263>: xor eax,eax
>> 0x0000000000b1eca9 <+265>: test ebp,ebp
>> 0x0000000000b1ecab <+267>: je 0xb1ed2b <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+395>
>> 0x0000000000b1ecad <+269>: mov rax,r13
>> 0x0000000000b1ecb0 <+272>: or rax,0x4
>> 0x0000000000b1ecb4 <+276>: cmp rax,0xfffffffffffffffc
>> 0x0000000000b1ecb8 <+280>: je 0xb1ee1e <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+638>
>> 0x0000000000b1ecbe <+286>: mov eax,r13d
>> 0x0000000000b1ecc1 <+289>: shr eax,0x9
>> 0x0000000000b1ecc4 <+292>: mov ecx,r13d
>> 0x0000000000b1ecc7 <+295>: shr ecx,0x4
>> 0x0000000000b1ecca <+298>: xor ecx,eax
>> 0x0000000000b1eccc <+300>: dec ebp
>> 0x0000000000b1ecce <+302>: and ecx,ebp
>> 0x0000000000b1ecd0 <+304>: lea rdx,[rcx+rcx*2]
>> 0x0000000000b1ecd4 <+308>: lea rax,[r15+rdx*8]
>> 0x0000000000b1ecd8 <+312>: mov rdi,QWORD PTR [r15+rdx*8]
>> 0x0000000000b1ecdc <+316>: cmp r13,rdi
>> 0x0000000000b1ecdf <+319>: je 0xb1ed65 <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+453>
>> 0x0000000000b1ece5 <+325>: xor edx,edx
>> 0x0000000000b1ece7 <+327>: mov esi,0x1
>> 0x0000000000b1ecec <+332>: nop DWORD PTR [rax+0x0]
>> 0x0000000000b1ecf0 <+336>: cmp rdi,0xfffffffffffffffc
>> 0x0000000000b1ecf4 <+340>: je 0xb1ed24 <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+388>
>> 0x0000000000b1ecf6 <+342>: add ecx,esi
>> 0x0000000000b1ecf8 <+344>: and ecx,ebp
>> 0x0000000000b1ecfa <+346>: test rdx,rdx
>> 0x0000000000b1ecfd <+349>: sete r8b
>> 0x0000000000b1ed01 <+353>: cmp rdi,0xfffffffffffffff8
>> 0x0000000000b1ed05 <+357>: sete bl
>> 0x0000000000b1ed08 <+360>: test r8b,bl
>> 0x0000000000b1ed0b <+363>: cmovne rdx,rax
>> 0x0000000000b1ed0f <+367>: lea rdi,[rcx+rcx*2]
>> 0x0000000000b1ed13 <+371>: lea rax,[r15+rdi*8]
>> 0x0000000000b1ed17 <+375>: mov rdi,QWORD PTR [r15+rdi*8]
>> 0x0000000000b1ed1b <+379>: inc esi
>> 0x0000000000b1ed1d <+381>: cmp r13,rdi
>> 0x0000000000b1ed20 <+384>: jne 0xb1ecf0 <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+336>
>> 0x0000000000b1ed22 <+386>: jmp 0xb1ed65 <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+453>
>> 0x0000000000b1ed24 <+388>: test rdx,rdx
>> 0x0000000000b1ed27 <+391>: cmovne rax,rdx
>> 0x0000000000b1ed2b <+395>: xorps xmm0,xmm0
>> 0x0000000000b1ed2e <+398>: movaps XMMWORD PTR [rsp+0x10],xmm0
>> 0x0000000000b1ed33 <+403>: lea rsi,[rsp+0x8]
>> 0x0000000000b1ed38 <+408>: mov rdi,r14
>> 0x0000000000b1ed3b <+411>: mov rdx,rax
>> 0x0000000000b1ed3e <+414>: call 0xb1f150
>> <llvm::DenseMapBase<llvm::DenseMap<char const*, std::pair<unsigned long,
>> jit_code_entry*>, llvm::DenseMapInfo<char const*> >, char const*,
>> std::pair<unsigned long, jit_code_entry*>, llvm::DenseMapInfo<char const*>
>> >::InsertIntoBucketImpl(char const* const&, std::pair<char const*,
>> std::pair<unsigned long, jit_code_entry*> >*)>
>> 0x0000000000b1ed43 <+419>: mov rcx,QWORD PTR [rsp+0x8]
>> 0x0000000000b1ed48 <+424>: mov QWORD PTR [rax],rcx
>> 0x0000000000b1ed4b <+427>: mov rcx,rax
>> 0x0000000000b1ed4e <+430>: add rcx,0x8
>> 0x0000000000b1ed52 <+434>: je 0xb1ed65 <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+453>
>> 0x0000000000b1ed54 <+436>: mov rdx,QWORD PTR [rsp+0x10]
>> 0x0000000000b1ed59 <+441>: mov rsi,QWORD PTR [rsp+0x18]
>> 0x0000000000b1ed5e <+446>: mov QWORD PTR [rcx+0x8],rsi
>> 0x0000000000b1ed62 <+450>: mov QWORD PTR [rcx],rdx
>> 0x0000000000b1ed65 <+453>: mov rcx,QWORD PTR [rsp]
>> 0x0000000000b1ed69 <+457>: mov QWORD PTR [rax+0x8],rcx
>> 0x0000000000b1ed6d <+461>: mov QWORD PTR [rax+0x10],r12
>> => 0x0000000000b1ed71 <+465>: lea rdi,[rip+0x707310] #
>> 0x1226088 <_ZN12_GLOBAL__N_112JITDebugLockE>
>> 0x0000000000b1ed78 <+472>: call 0xca3810
>> <llvm::sys::MutexImpl::acquire()>
>> 0x0000000000b1ed7d <+477>: mov rax,QWORD PTR [rip+0x6fdeb4]
>> # 0x121cc38
>> 0x0000000000b1ed84 <+484>: mov DWORD PTR [rax+0x4],0x1
>> 0x0000000000b1ed8b <+491>: mov QWORD PTR [r12+0x8],0x0
>> 0x0000000000b1ed94 <+500>: mov rax,QWORD PTR [rax+0x10]
>> 0x0000000000b1ed98 <+504>: mov QWORD PTR [r12],rax
>> 0x0000000000b1ed9c <+508>: test rax,rax
>> 0x0000000000b1ed9f <+511>: je 0xb1eda5 <(anonymous
>> namespace)::GDBJITRegistrar::registerObject(llvm::ObjectBuffer const&)+517>
>> 0x0000000000b1eda1 <+513>: mov QWORD PTR [rax+0x8],r12
>> 0x0000000000b1eda5 <+517>: mov rax,QWORD PTR [rip+0x6fde8c]
>> # 0x121cc38
>> 0x0000000000b1edac <+524>: mov QWORD PTR [rax+0x10],r12
>> 0x0000000000b1edb0 <+528>: mov QWORD PTR [rax+0x8],r12
>> 0x0000000000b1edb4 <+532>: lea rdi,[rip+0x7072cd] #
>> 0x1226088 <_ZN12_GLOBAL__N_112JITDebugLockE>
>> 0x0000000000b1edbb <+539>: call 0xca3850
>> <llvm::sys::MutexImpl::release()>
>> 0x0000000000b1edc0 <+544>: add rsp,0x28
>> 0x0000000000b1edc4 <+548>: pop rbx
>> 0x0000000000b1edc5 <+549>: pop r12
>> 0x0000000000b1edc7 <+551>: pop r13
>> 0x0000000000b1edc9 <+553>: pop r14
>> 0x0000000000b1edcb <+555>: pop r15
>> 0x0000000000b1edcd <+557>: pop rbp
>> 0x0000000000b1edce <+558>: ret
>> 0x0000000000b1edcf <+559>: lea rdi,[rip+0x35f9a9] # 0xe7e77f
>> 0x0000000000b1edd6 <+566>: lea rsi,[rip+0x35f6fc] # 0xe7e4d9
>> 0x0000000000b1eddd <+573>: lea rcx,[rip+0x35f9da] # 0xe7e7be
>> 0x0000000000b1ede4 <+580>: mov edx,0x84
>> 0x0000000000b1ede9 <+585>: call 0x4e7ef0 <__assert_fail at plt>
>> 0x0000000000b1edee <+590>: lea rdi,[rip+0x35fa29] # 0xe7e81e
>> 0x0000000000b1edf5 <+597>: lea rsi,[rip+0x35f6dd] # 0xe7e4d9
>> 0x0000000000b1edfc <+604>: lea rcx,[rip+0x35f9bb] # 0xe7e7be
>> 0x0000000000b1ee03 <+611>: mov edx,0x86
>> 0x0000000000b1ee08 <+616>: call 0x4e7ef0 <__assert_fail at plt>
>> 0x0000000000b1ee0d <+621>: lea rdi,[rip+0x35fa73] # 0xe7e887
>> 0x0000000000b1ee14 <+628>: mov esi,0x1
>> 0x0000000000b1ee19 <+633>: call 0xc9dbe0
>> <llvm::report_fatal_error(char const*, bool)>
>> 0x0000000000b1ee1e <+638>: lea rdi,[rip+0x1a8998] # 0xcc77bd
>> 0x0000000000b1ee25 <+645>: lea rsi,[rip+0x1a8045] # 0xcc6e71
>> 0x0000000000b1ee2c <+652>: lea rcx,[rip+0x35f722] # 0xe7e555
>> 0x0000000000b1ee33 <+659>: mov edx,0x1e0
>> 0x0000000000b1ee38 <+664>: call 0x4e7ef0 <__assert_fail at plt>
>
>
>
> On Tue, Mar 25, 2014 at 4:19 PM, Kaylor, Andrew <andrew.kaylor at intel.com>wrote:
>
>> Actually, put aside what I said in my previous reply for a second.
>>
>>
>>
>> I just noticed in your output below that GDB didn't have symbols for
>> lli. That's probably the heart of your problem. GDB relies on hooking a
>> known function to get the JITed code registration to work. Since it didn't
>> find symbols for lli, it won't find the hook function.
>>
>>
>>
>> You'll need to use a build of lli with symbols to make this work.
>>
>>
>>
>> -Andy
>>
>>
>>
>> *From:* llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] *On
>> Behalf Of *Zach Devito
>> *Sent:* Tuesday, March 25, 2014 1:35 PM
>> *To:* LLVM Developers Mailing List
>> *Subject:* [LLVMdev] Getting the Debugging JIT-ed Code with GDB example
>> to work
>>
>>
>>
>> I'm trying to run the example described at:
>>
>>
>>
>> http://llvm.org/docs/DebuggingJITedCode.html
>>
>>
>>
>> I followed the sample command line session (below, with versions numbers
>> for everything), but gdb doesn't stop at the breakpoints as described. Any
>> idea what is wrong?
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Zach
>>
>>
>>
>>
>>
>> zdevito at derp:~/terra/tests$
>> ~/clang+llvm-3.4-x86_64-unknown-ubuntu12.04/bin/clang -cc1 -O0 -g
>> -emit-llvm showdebug.c
>> zdevito at derp:~/terra/tests$ gdb --args
>> ~/clang+llvm-3.4-x86_64-unknown-ubuntu12.04/bin/lli -use-mcjit showdebug.ll
>> 5
>> GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2) 7.4-2012.04
>> Copyright (C) 2012 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later <
>> http://gnu.org/licenses/gpl.html>
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
>> and "show warranty" for details.
>> This GDB was configured as "x86_64-linux-gnu".
>> For bug reporting instructions, please see:
>> <http://bugs.launchpad.net/gdb-linaro/>...
>> Reading symbols from
>> /home/zdevito/clang+llvm-3.4-x86_64-unknown-ubuntu12.04/bin/lli...(no
>> debugging symbols found)...done.
>> (gdb) b showdebug.c:6
>> No symbol table is loaded. Use the "file" command.
>> Make breakpoint pending on future shared library load? (y or [n]) y
>> Breakpoint 1 (showdebug.c:6) pending.
>> (gdb) r
>> Starting program:
>> /home/zdevito/clang+llvm-3.4-x86_64-unknown-ubuntu12.04/bin/lli -use-mcjit
>> showdebug.ll 5
>> [Thread debugging using libthread_db enabled]
>> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
>> [Inferior 1 (process 8538) exited with code 0170]
>> (gdb)
>>
>>
>>
>
>
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>
>
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