Eric Pouech : winedbg: Allow backtraces to properly return address outside functions.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: d49fe171f77a0ff5501efc653d602380d82592a4
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=d49fe171f77a0ff5501efc653d...

Author: Eric Pouech 
Date:   Tue Mar 30 21:37:22 2010 +0200

winedbg: Allow backtraces to properly return address outside functions.

---

programs/winedbg/stack.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/programs/winedbg/stack.c b/programs/winedbg/stack.c
index 4b2286c..7ba2773 100644
--- a/programs/winedbg/stack.c
+++ b/programs/winedbg/stack.c
@@ -83,6 +83,15 @@ static BOOL stack_get_frame(int nf, IMAGEHLP_STACK_FRAME* ihsf)
 {
     memset(ihsf, 0, sizeof(*ihsf));
     ihsf->InstructionOffset = dbg_curr_thread->frames[nf].linear_pc;
+    /* if we're not the first frame, InstructionOffset is the return address
+     * after the call instruction (at least on most processors I know of).
+     * However, there are cases where this address is outside of the current function.
+     * This happens when the called function is marked <NO RETURN>, in which
+     * case the compiler can omit the epilog (gcc 4 does it)
+     * Therefore, we decrement InstructionOffset in order to ensure that
+     * the considered address is really inside the current function.
+     */
+    if (nf) ihsf->InstructionOffset--;
     ihsf->FrameOffset = dbg_curr_thread->frames[nf].linear_frame;
     ihsf->StackOffset = dbg_curr_thread->frames[nf].linear_stack;
     return TRUE;