Re: More than one stabn for the same PC

[Mark Mitchell <mark@codesourcery.com>]

>>>>> "Jeffrey" == Jeffrey A Law <law@cygnus.com> writes:

    Jeffrey> Though I am curious, how does this happen?

We tend to do this with inlining.  (We're doing it more with
inlining-on-trees, but we used to do it anyhow.)  Consider:

  int i;
  inline int f () {  
    i = 3;
  }
  void g() {
    f();
  }

In `g' we first emit a line note for the line with the curly brace for
`g', then emit a line note for the line with `i = 3' in it.  I think
that's roughly the right thing, but the debugger gets confused.

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com
From law@cygnus.com Mon Nov 29 23:10:00 1999
From: Jeffrey A Law <law@cygnus.com>
To: Mark Mitchell <mark@codesourcery.com>
Cc: gdb@sourceware.cygnus.com, gcc@gcc.gnu.org
Subject: Re: More than one stabn for the same PC 
Date: Mon, 29 Nov 1999 23:10:00 -0000
Message-id: <28295.943945638@upchuck>
References: <19991129223717L.mitchell@codesourcery.com>
X-SW-Source: 1999-q4/msg00362.html
Content-length: 899

  In message < 19991129223717L.mitchell@codesourcery.com >you write:
  > >>>>> "Jeffrey" == Jeffrey A Law <law@cygnus.com> writes:
  > 
  >     Jeffrey> Though I am curious, how does this happen?
  > 
  > We tend to do this with inlining.  (We're doing it more with
  > inlining-on-trees, but we used to do it anyhow.)  Consider:
  > 
  >   int i;
  >   inline int f () {  
  >     i = 3;
  >   }
  >   void g() {
  >     f();
  >   }
  > 
  > In `g' we first emit a line note for the line with the curly brace for
  > `g', then emit a line note for the line with `i = 3' in it.  I think
  > that's roughly the right thing, but the debugger gets confused.
Looking at that I'd claim only one of the line notes should exist (probably
the one of the "i = 3" statement.

But it may be the case that our opinions about what constitutes sane debugging
information for inline function calls differs.
jeff