[Bug gas/29451] New: gas-2.39 started adding 0-sized DIEs to functions without .size

[slyich at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29451

            Bug ID: 29451
           Summary: gas-2.39 started adding 0-sized DIEs to functions
                    without .size
           Product: binutils
           Version: 2.39
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: slyich at gmail dot com
  Target Milestone: ---

Discovered in https://sourceware.org/PR29450 where gas-2.38 did not attach
0-sized DIE for glibc's _init assembly-written function and gas-2.39 did.

Simple reproducer:

$ cat crti.S.S

 .section .init,"ax",@progbits
 .p2align 2
 .globl _init
 .hidden _init
 .type _init, @function
_init:
  .section
.text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
    .globl __x86.get_pc_thunk.bx
    .hidden __x86.get_pc_thunk.bx
    .p2align 4
    .type __x86.get_pc_thunk.bx,@function
    __x86.get_pc_thunk.bx:
      ud2
    .size __x86.get_pc_thunk.bx, . - __x86.get_pc_thunk.bx
    .previous
  ud2

$ as-2.39 --gdwarf2 --32 -o crti.o crti.S.S
$ readelf -aW --debug-dump crti.o

 <0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <c>   DW_AT_stmt_list   : (data4) 0x0
    <10>   DW_AT_ranges      : (data4) 0x0
    <14>   DW_AT_name        : (strp) (offset: 0x0): crti.S.S
    <18>   DW_AT_comp_dir    : (strp) (offset: 0x9):
/home/slyfox/dev/bugs/binutils-2.39-crti-size/delta
    <1c>   DW_AT_producer    : (strp) (offset: 0x3d): GNU AS 2.39
    <20>   DW_AT_language    : (data2) 32769    (MIPS assembler)
 <1><22>: Abbrev Number: 2 (DW_TAG_subprogram)
    <23>   DW_AT_name        : (strp) (offset: 0x49): _init
    <27>   DW_AT_external    : (flag) 1
    <28>   DW_AT_low_pc      : (addr) 0x0
    <2c>   DW_AT_high_pc     : (addr) 0x0
 <1><30>: Abbrev Number: 2 (DW_TAG_subprogram)
    <31>   DW_AT_name        : (strp) (offset: 0x4f): __x86.get_pc_thunk.bx
    <35>   DW_AT_external    : (flag) 1
    <36>   DW_AT_low_pc      : (addr) 0x0
    <3a>   DW_AT_high_pc     : (addr) 0x2
 <1><3e>: Abbrev Number: 0

$ as-2.38 --gdwarf2 --32 -o crti.o crti.S.S
$ readelf -aW --debug-dump crti.o

 <0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <c>   DW_AT_stmt_list   : (data4) 0x0
    <10>   DW_AT_ranges      : (data4) 0x0
    <14>   DW_AT_name        : (strp) (offset: 0x0): crti.S.S
    <18>   DW_AT_comp_dir    : (strp) (offset: 0x9):
/home/slyfox/dev/bugs/binutils-2.39-crti-size/delta
    <1c>   DW_AT_producer    : (strp) (offset: 0x3d): GNU AS 2.38
    <20>   DW_AT_language    : (data2) 32769    (MIPS assembler)

Would it be fair to say it's a bug to assign zero size here via DW_AT_low_pc /
DW_AT_high_pc?

-- 
You are receiving this mail because:
You are on the CC list for the bug.