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From: "gprocida+abigail at google dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug default/27552] New: libandroid.so missing symbol type information
Date: Tue, 09 Mar 2021 16:20:17 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27552

            Bug ID: 27552
           Summary: libandroid.so missing symbol type information
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: gprocida+abigail at google dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

The libandroid.so library is now part of the libabigail test suite, as is an
ABI extracted from this.

I noticed that the names used of the ELF symbols and the names of declared
variables and functions, as found in the ABI, are disjoint.

I verified that:
1. if a symbol is added or removed, this is reported
2. if any type information changes, this is not reported

An examination of libandroid.so with nm -o and dwarfdump confirms that symb=
ol
names are properly present in the DWARF.

For example, from the dwarfdump:

< 1><0x00024873>    DW_TAG_subprogram
                      DW_AT_low_pc                0x0000ce62
                      DW_AT_high_pc               <offset-from-lowpc>38
                      DW_AT_frame_base            len 0x0001: 0x5d:=20
                          DW_OP_reg13
                      DW_AT_GNU_all_call_sites    yes(1)
                      DW_AT_name                  AAssetDir_close
                      DW_AT_decl_file             0x00000034
frameworks/base/native/android/asset_manager.cpp
                      DW_AT_decl_line             0x0000008c
                      DW_AT_external              yes(1)
< 2><0x00024885>      DW_TAG_formal_parameter
                        DW_AT_location              0x00001332
      .debug_loc      offset  : 0x00001332
      <loclist at offset 0x00001332 with 4 entries follows>
   [ 0]<base address       0x0000ce62>
   [ 1]<low,hi addrs       0x0000ce62 , 0x0000ce68>
                            DW_OP_reg0
   [ 2]<low,hi addrs       0x0000ce68 , 0x0000ce82>
                            DW_OP_reg4
   [ 3]<low,hi addrs       0x0000ce86 , 0x0000ce88>
                            DW_OP_reg0
                        DW_AT_name                  assetDir
                        DW_AT_decl_file             0x00000034
frameworks/base/native/android/asset_manager.cpp
                        DW_AT_decl_line             0x0000008c
                        DW_AT_type                  <0x00024e40>
< 2><0x00024894>      DW_TAG_inlined_subroutine
...


If I discover anything further, I'll follow up here.

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