[llvm-bugs] [Bug 50576] New: lld/mac's LC_FUNCTION_STARTS section is all wrong

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50576

            Bug ID: 50576
           Summary: lld/mac's LC_FUNCTION_STARTS section is all wrong
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: MachO
          Assignee: unassignedbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: gkm at fb.com, jezreel at gmail.com,
                    llvm-bugs at lists.llvm.org, smeenai at fb.com

1. Download repro zip from https://bugs.llvm.org/show_bug.cgi?id=48657#c0

2. Link

3. `xcrun dyldinfo -function_starts Chromium.app/Contents/Frameworks/Chromium\
Framework.framework/Versions/Current/Chromium\ Framework | head -1`

Works fine when linking with ld64, prints garbage with lld. ld64:

% xcrun dyldinfo -function_starts Chromium.app/Contents/Frameworks/Chromium\
Framework.framework/Versions/Current/Chromium\ Framework | head -10
0x3B00   _ChromeAppModeStart_v6
0x4880   _ChromeMain
0x49E0   __ZN25ChromeCrashReporterClient6CreateEv
0x4B80   __ZN25ChromeCrashReporterClientD1Ev
0x4B90   __ZN25ChromeCrashReporterClientD0Ev
0x4BB0  
__ZN25ChromeCrashReporterClient20GetCrashDumpLocationEPN4base8FilePathE
0x4BC0  
__ZN25ChromeCrashReporterClient23GetCrashMetricsLocationEPN4base8FilePathE
0x4BD0   __ZN25ChromeCrashReporterClient19IsRunningUnattendedEv
0x4C40   __ZN25ChromeCrashReporterClient22GetCollectStatsConsentEv
0x4CD0  
__ZN25ChromeCrashReporterClient24EnableBreakpadForProcessERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEE

lld:

0x10B2460   __ZN14crash_reporter19CrashReporterClient12GetUploadUrlEv
0x10B2458   ?
0x10B2450  
__ZN14crash_reporter19CrashReporterClient27ReportingIsEnforcedByPolicyEPb
0x10B2460   __ZN14crash_reporter19CrashReporterClient12GetUploadUrlEv
0x10B2458   ?
0x10B2450  
__ZN14crash_reporter19CrashReporterClient27ReportingIsEnforcedByPolicyEPb
0x10B2510   ?
0x4239830   ?
0x423E8E0   ?
0x4274C90   ?



Also, the section is over 1 MB smaller with ld64:

% otool -l Chromium.app/Contents/Frameworks/Chromium\
Framework.framework/Versions/Current/Chromium\ Framework | grep -A3 LC_FUN
      cmd LC_FUNCTION_STARTS
  cmdsize 16
  dataoff 171232496
 datasize 838208

vs with lld:

% otool -l Chromium.app/Contents/Frameworks/Chromium\
Framework.framework/Versions/Current/Chromium\ Framework | grep -A3 LC_FUN
      cmd LC_FUNCTION_STARTS
  cmdsize 16
  dataoff 183842744
 datasize 2003880

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