[Bug debug/58663] New: entry-value: missing DW_TAG_GNU_call_site for libasan calls

[Bug debug/58663] New: entry-value: missing DW_TAG_GNU_call_site for libasan calls

[jan.kratochvil at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58663

            Bug ID: 58663
           Summary: entry-value: missing DW_TAG_GNU_call_site for libasan
                    calls
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jan.kratochvil at redhat dot com
            Target: x86_64-unknown-linux-gnu

FAIL: gcc (GCC) 4.9.0 20131008 (experimental)

 <1><5b4>: Abbrev Number: 5 (DW_TAG_subprogram)
    <5b5>   DW_AT_name        : (indirect string, offset: 0x2d16): main 
    <5d1>   DW_AT_GNU_all_tail_call_sites: 1    
 <2><5d5>: Abbrev Number: 6 (DW_TAG_variable)
 <2><5e1>: Abbrev Number: 0

.s:
        movq    %rax, %rdi
        call    __asan_report_store1

In practice one does not see the passed values:
#4  0x000000000040f447 in __asan::__asan_report_store1 (addr=<optimized out>)
#5  0x000000000041aafe in main () at old/test9.c:4
(gdb) set debug entry-values 1
(gdb) print addr
DW_OP_GNU_entry_value resolving cannot find DW_TAG_GNU_call_site 0x41aafe in
main

Tried also -static-libasan, it does not / cannot help.

(I am not sure entry-values would be valid here if the call site was present.)

[Bug debug/58663] entry-value: missing DW_TAG_GNU_call_site for libasan calls

[jan.kratochvil at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58663

--- Comment #1 from Jan Kratochvil <jan.kratochvil at redhat dot com> ---
#include <stdlib.h>
int main(void) {
  char *p=malloc(1);
  p[1]=1;
  return 0;
}

[Bug debug/58663] entry-value: missing DW_TAG_GNU_call_site for libasan calls

[jan.kratochvil at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58663

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Jan Kratochvil <jan.kratochvil at redhat dot com> ---
I forgot DW_TAG_GNU_call_site is only generated with -O.

Just in such case it is still not resolved but it is because the value is not
saved in the caller:
(gdb) p addr
Cannot find matching parameter at DW_TAG_GNU_call_site 0x4007c6 at main
$1 = <optimized out>

     0: DW_OP_GNU_entry_value
       2: DW_OP_reg5 [$rdi]
+
 <2><600>: Abbrev Number: 10 (DW_TAG_GNU_call_site)
    <601>   DW_AT_low_pc      : 0x4007c6        
    <609>   DW_AT_abstract_origin: <0x65d>      
[no parameters]