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From: "jan.kratochvil at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/15391] New: DW_OP_GNU_implicit_pointer bug
Date: Tue, 23 Apr 2013 12:25:00 -0000
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X-Bugzilla-Who: jan.kratochvil at redhat dot com
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http://sourceware.org/bugzilla/show_bug.cgi?id=15391

             Bug #: 15391
           Summary: DW_OP_GNU_implicit_pointer bug
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
                CC: tromey@redhat.com
    Classification: Unclassified
            Target: x86_64-unknown-linux-gnu


struct S { short a; char b, c; };
volatile int v;
void foo (int x)
{
  struct S s = { x, x + 2, x + 3 };
  char *p = &s.b;
  s.a++;
  v++; /* line 8 */
}
int main ()
{
  foo (1);
  return 0;
}

gcc-4.8.0-2.fc19.x86_64
gcc -g -O2 -fno-inline -fno-ipa-cp -o implptr implptr.c -Wall

gdb ./implptr -ex 'b 8' -ex r -ex 'p p[-1]' -ex c -ex q -q

Actual:
$1 = 3 '\003'

Expected:
$1 = 0 '\000'

Bugreported by Jakub Jelinek.


Abbrev Number: 7 (DW_TAG_variable)
 DW_AT_name     : s  
 DW_AT_location : (DW_OP_breg5 (rdi): 1; DW_OP_stack_value; DW_OP_piece: 2;
DW_OP_breg5 (rdi): 2; DW_OP_stack_value; DW_OP_piece: 1; DW_OP_breg5 (rdi): 3;
DW_OP_stack_value; DW_OP_piece: 1)

Abbrev Number: 7 (DW_TAG_variable)
 DW_AT_name     : p  
 DW_AT_location : (DW_OP_GNU_implicit_pointer: <0x88> 2)

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