I have a class which has many members in it
int latest_encode_usage_ = 67;
int perf_target_framerate_ = 0;
std::map<uint8_t, uint16_t> pre_dlbitrate_;
#if defined(WEBRTC_TRANSCODE_CASE)
bool is_screen_share_;
#endif
and I have defined WEBRTC_TRANSCODE_CASE in build.gn
defines += ["WEBRTC_TRANSCODE_CASE"]
so the is_screen_share_ is visible in the class, I compile this code with RelWithDebInfo and got a shared library called liba.so, then I remove the preprocessor directives
bool is_perf_adaption_avalaible_;
int latest_encode_usage_ = 67;
int perf_target_framerate_ = 0;
std::map<uint8_t, uint16_t> pre_dlbitrate_;
bool is_screen_share_
and compile the code with RelWithDebInfo got libb.so, when I execute the command diff <(objdump -d liba.so) <(objdump -d libb.so) and got
1714248c1714248
< 7225b9: bf b8 0f 00 00 mov $0xfb8,%edi
---
> 7225b9: bf c0 0f 00 00 mov $0xfc0,%edi
, it seems 8 bytes different, but why ? I just don't understand. It's part of liba.so's objdump:
0000000000722580 <_ZN6webrtc24CreateVideoStreamEncoderEjPNS_26VideoStreamEncoderObserverERKNS_26VideoStreamEncoderSettingsENS_18VideoEncoderConfig11ContentTypeE>:
722580: 55 push %rbp
722581: 48 89 e5 mov %rsp,%rbp
722584: 41 57 push %r15
722586: 41 56 push %r14
722588: 41 55 push %r13
72258a: 41 54 push %r12
72258c: 49 89 d5 mov %rdx,%r13
72258f: 53 push %rbx
722590: 48 89 fb mov %rdi,%rbx
722593: bf 90 00 00 00 mov $0x90,%edi
722598: 49 89 cf mov %rcx,%r15
72259b: 41 89 f6 mov %esi,%r14d
72259e: 48 83 ec 28 sub $0x28,%rsp
7225a2: 44 89 45 bc mov %r8d,-0x44(%rbp)
7225a6: e8 e5 0a 61 00 callq d33090 <_Znwm>
7225ab: 4c 89 ee mov %r13,%rsi
7225ae: 48 89 c7 mov %rax,%rdi
7225b1: 49 89 c4 mov %rax,%r12
7225b4: e8 17 0a 00 00 callq 722fd0 <_ZN6webrtc20OveruseFrameDetectorC1EPNS_25CpuOveruseMetricsObserverE>
7225b9: bf b8 0f 00 00 mov $0xfb8,%edi
7225be: 4c 89 65 c8 mov %r12,-0x38(%rbp)
7225c2: e8 c9 0a 61 00 callq d33090 <_Znwm>
7225c7: 44 8b 45 bc mov -0x44(%rbp),%r8d
7225cb: 48 89 c7 mov %rax,%rdi
7225ce: 4c 89 f9 mov %r15,%rcx
7225d1: 4c 89 ea mov %r13,%rdx
7225d4: 44 89 f6 mov %r14d,%esi
7225d7: 49 89 c4 mov %rax,%r12
7225da: 45 89 c1 mov %r8d,%r9d
7225dd: 4c 8d 45 c8 lea -0x38(%rbp),%r8
7225e1: e8 3a 3f 00 00 callq 726520 <_ZN6webrtc18VideoStreamEncoderC1EjPNS_26VideoStreamEncoderObserverERKNS_26VideoStreamEncoderSettingsESt10unique_ptrINS_20OveruseFra
7225e6: 48 8b 7d c8 mov -0x38(%rbp),%rdi
7225ea: 48 85 ff test %rdi,%rdi
7225ed: 74 06 je 7225f5 <_ZN6webrtc24CreateVideoStreamEncoderEjPNS_26VideoStreamEncoderObserverERKNS_26VideoStreamEncoderSettingsENS_18VideoEncoderConfig11C
it's part of libb.so's objdump:
0000000000722580 <_ZN6webrtc24CreateVideoStreamEncoderEjPNS_26VideoStreamEncoderObserverERKNS_26VideoStreamEncoderSettingsENS_18VideoEncoderConfig11ContentTypeE>:
722580: 55 push %rbp
722581: 48 89 e5 mov %rsp,%rbp
722584: 41 57 push %r15
722586: 41 56 push %r14
722588: 41 55 push %r13
72258a: 41 54 push %r12
72258c: 49 89 d5 mov %rdx,%r13
72258f: 53 push %rbx
722590: 48 89 fb mov %rdi,%rbx
722593: bf 90 00 00 00 mov $0x90,%edi
722598: 49 89 cf mov %rcx,%r15
72259b: 41 89 f6 mov %esi,%r14d
72259e: 48 83 ec 28 sub $0x28,%rsp
7225a2: 44 89 45 bc mov %r8d,-0x44(%rbp)
7225a6: e8 e5 0a 61 00 callq d33090 <_Znwm>
7225ab: 4c 89 ee mov %r13,%rsi
7225ae: 48 89 c7 mov %rax,%rdi
7225b1: 49 89 c4 mov %rax,%r12
7225b4: e8 17 0a 00 00 callq 722fd0 <_ZN6webrtc20OveruseFrameDetectorC1EPNS_25CpuOveruseMetricsObserverE>
7225b9: bf c0 0f 00 00 mov $0xfc0,%edi
7225be: 4c 89 65 c8 mov %r12,-0x38(%rbp)
7225c2: e8 c9 0a 61 00 callq d33090 <_Znwm>
7225c7: 44 8b 45 bc mov -0x44(%rbp),%r8d
7225cb: 48 89 c7 mov %rax,%rdi
7225ce: 4c 89 f9 mov %r15,%rcx
7225d1: 4c 89 ea mov %r13,%rdx
7225d4: 44 89 f6 mov %r14d,%esi
7225d7: 49 89 c4 mov %rax,%r12
7225da: 45 89 c1 mov %r8d,%r9d
7225dd: 4c 8d 45 c8 lea -0x38(%rbp),%r8
7225e1: e8 3a 3f 00 00 callq 726520 <_ZN6webrtc18VideoStreamEncoderC1EjPNS_26VideoStreamEncoderObserverERKNS_26VideoStreamEncoderSettingsESt10unique_ptrINS_20OveruseFra
7225e6: 48 8b 7d c8 mov -0x38(%rbp),%rdi
7225ea: 48 85 ff test %rdi,%rdi
7225ed: 74 06 je 7225f5 <_ZN6webrtc24CreateVideoStreamEncoderEjPNS_26VideoStreamEncoderObserverERKNS_26VideoStreamEncoderSettingsENS_18VideoEncoderConfig11C.
Any help will be appreciateed!
