* alpha-mdebug-tdep.c (alpha_mdebug_frame_p): Reject prologues.kettenis_i386newframe-20030419-branch

        (alpha_mdebug_frame_unwind_cache): Don't call the heuristic unwinder.
        (alpha_mdebug_frame_this_id): Likewise.
        (alpha_mdebug_frame_prev_register): Likewise.
        (alpha_mdebug_frame_base_address): Likewise.
        (alpha_mdebug_frame_locals_address): Likewise.
        (alpha_mdebug_frame_args_address): Likewise.
        (struct alpha_mdebug_unwind_cache): Remove in_prologue_cache.
        * alpha-tdep.c (alpha_heuristic_proc_start): Use get_pc_function_start.
        (alpha_heuristic_frame_unwind_cache): Make static; add missing
        loop increment.
        (alpha_heuristic_frame_this_id): Make static.
        (alpha_heuristic_frame_prev_register): Likewise.
        (alpha_heuristic_frame_base_address): Likewise.
        * alpha-tdep.h: Update.

4 files changed, 44 insertions, 69 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9df7396..e699aab 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,21 @@
+2003-05-30  Richard Henderson  <rth@redhat.com>
+
+        * alpha-mdebug-tdep.c (alpha_mdebug_frame_p): Reject prologues.
+        (alpha_mdebug_frame_unwind_cache): Don't call the heuristic unwinder.
+        (alpha_mdebug_frame_this_id): Likewise.
+        (alpha_mdebug_frame_prev_register): Likewise.
+        (alpha_mdebug_frame_base_address): Likewise.
+        (alpha_mdebug_frame_locals_address): Likewise.
+        (alpha_mdebug_frame_args_address): Likewise.
+        (struct alpha_mdebug_unwind_cache): Remove in_prologue_cache.
+        * alpha-tdep.c (alpha_heuristic_proc_start): Use get_pc_function_start.
+        (alpha_heuristic_frame_unwind_cache): Make static; add missing
+        loop increment.
+        (alpha_heuristic_frame_this_id): Make static.
+        (alpha_heuristic_frame_prev_register): Likewise.
+        (alpha_heuristic_frame_base_address): Likewise.
+        * alpha-tdep.h: Update.
+
 2003-05-29  Richard Henderson  <rth@redhat.com>
 
 	* alpha-linux-tdep.c (alpha_linux_sigtramp_offset_1): New.
diff --git a/gdb/alpha-mdebug-tdep.c b/gdb/alpha-mdebug-tdep.c
index 2f84d6d..2f49e08 100644
--- a/gdb/alpha-mdebug-tdep.c
+++ b/gdb/alpha-mdebug-tdep.c
@@ -174,7 +174,6 @@ struct alpha_mdebug_unwind_cache
   alpha_extra_func_info_t proc_desc;
   CORE_ADDR vfp;
   CORE_ADDR *saved_regs;
-  void *in_prologue_cache;
 };
 
 /* Extract all of the information about the frame from PROC_DESC
@@ -205,21 +204,6 @@ alpha_mdebug_frame_unwind_cache (struct frame_info *next_frame,
   info->proc_desc = proc_desc;
   gdb_assert (proc_desc != NULL);
 
-  /* If we're in the prologue, the PDR for this frame is not yet valid.  */
-  /* ??? We could have said "no" in alpha_mdebug_frame_p, and we'd
-     walk down the list of unwinders and try the heuristic unwinder
-     and things would have been fine. However, since we have the PDR,
-     we know how to skip the search for the start of the procedure,
-     and all the uncertainty involved there.  So instead, arrange for
-     us to defer to the heuristic unwinder directly.  */
-  if (alpha_mdebug_in_prologue (pc, proc_desc))
-    {
-      alpha_heuristic_frame_unwind_cache (next_frame,
-      					  &info->in_prologue_cache,
-					  PROC_LOW_ADDR (proc_desc));
-      return info;
-    }
-
   info->saved_regs = frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);
 
   /* The VFP of the frame is at FRAME_REG+FRAME_OFFSET.  */
@@ -275,12 +259,7 @@ alpha_mdebug_frame_this_id (struct frame_info *next_frame,
   struct alpha_mdebug_unwind_cache *info
     = alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
 
-  /* If we're in the prologue, defer to the heuristic unwinder.  */
-  if (info->in_prologue_cache)
-    alpha_heuristic_frame_this_id (next_frame, &info->in_prologue_cache,
-    				   this_id);
-  else
-    *this_id = frame_id_build (info->vfp, frame_func_unwind (next_frame));
+  *this_id = frame_id_build (info->vfp, frame_func_unwind (next_frame));
 }
 
 /* Retrieve the value of REGNUM in FRAME.  Don't give up!  */
@@ -295,16 +274,6 @@ alpha_mdebug_frame_prev_register (struct frame_info *next_frame,
   struct alpha_mdebug_unwind_cache *info
     = alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
 
-  /* If we're in the prologue, defer to the heuristic unwinder.  */
-  if (info->in_prologue_cache)
-    {
-      alpha_heuristic_frame_prev_register (next_frame,
-      					   &info->in_prologue_cache,
-					   regnum, optimizedp, lvalp,
-					   addrp, realnump, bufferp);
-      return;
-    }
-
   /* The PC of the previous frame is stored in the link register of
      the current frame.  Frob regnum so that we pull the value from
      the correct place.  */
@@ -359,6 +328,11 @@ alpha_mdebug_frame_p (CORE_ADDR pc)
   if (proc_desc == NULL)
     return NULL;
 
+  /* If we're in the prologue, the PDR for this frame is not yet valid.
+     Say no here and we'll fall back on the heuristic unwinder.  */
+  if (alpha_mdebug_in_prologue (pc, proc_desc))
+    return NULL;
+
   return &alpha_mdebug_frame_unwind;
 }
 
@@ -369,11 +343,7 @@ alpha_mdebug_frame_base_address (struct frame_info *next_frame,
   struct alpha_mdebug_unwind_cache *info
     = alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
 
-  if (info->in_prologue_cache)
-    return alpha_heuristic_frame_base_address (next_frame,
-    					       &info->in_prologue_cache);
-  else
-    return info->vfp;
+  return info->vfp;
 }
 
 static CORE_ADDR
@@ -382,15 +352,8 @@ alpha_mdebug_frame_locals_address (struct frame_info *next_frame,
 {
   struct alpha_mdebug_unwind_cache *info
     = alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
-  CORE_ADDR vfp;
 
-  if (info->in_prologue_cache)
-    vfp = alpha_heuristic_frame_base_address (next_frame,
-    					      &info->in_prologue_cache);
-  else
-    vfp = info->vfp;
-
-  return vfp - PROC_LOCALOFF (info->proc_desc);
+  return info->vfp - PROC_LOCALOFF (info->proc_desc);
 }
 
 static CORE_ADDR
@@ -399,15 +362,8 @@ alpha_mdebug_frame_args_address (struct frame_info *next_frame,
 {
   struct alpha_mdebug_unwind_cache *info
     = alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
-  CORE_ADDR vfp;
-
-  if (info->in_prologue_cache)
-    vfp = alpha_heuristic_frame_base_address (next_frame,
-    					      &info->in_prologue_cache);
-  else
-    vfp = info->vfp;
 
-  return vfp - ALPHA_NUM_ARG_REGS * 8;
+  return info->vfp - ALPHA_NUM_ARG_REGS * 8;
 }
 
 static const struct frame_base alpha_mdebug_frame_base = {
diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c
index 2bd3b26..cd29c95 100644
--- a/gdb/alpha-tdep.c
+++ b/gdb/alpha-tdep.c
@@ -666,10 +666,18 @@ alpha_heuristic_proc_start (CORE_ADDR pc)
   CORE_ADDR last_non_nop = pc;
   CORE_ADDR fence = pc - heuristic_fence_post;
   CORE_ADDR orig_pc = pc;
+  CORE_ADDR func;
 
   if (pc == 0)
     return 0;
 
+  /* First see if we can find the start of the function from minimal
+     symbol information.  This can succeed with a binary that doesn't
+     have debug info, but hasn't been stripped.  */
+  func = get_pc_function_start (pc);
+  if (func)
+    return func;
+
   if (heuristic_fence_post == UINT_MAX
       || fence < tdep->vm_min_address)
     fence = tdep->vm_min_address;
@@ -725,7 +733,7 @@ Otherwise, you told GDB there was a function where there isn't one, or\n\
   return 0;
 }
 
-struct alpha_heuristic_unwind_cache *
+static struct alpha_heuristic_unwind_cache *
 alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
 				    void **this_prologue_cache,
 				    CORE_ADDR start_pc)
@@ -882,7 +890,7 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
 /* Given a GDB frame, determine the address of the calling function's
    frame.  This will be used to create a new GDB frame struct.  */
 
-void
+static void
 alpha_heuristic_frame_this_id (struct frame_info *next_frame,
 				 void **this_prologue_cache,
 				 struct frame_id *this_id)
@@ -890,12 +898,17 @@ alpha_heuristic_frame_this_id (struct frame_info *next_frame,
   struct alpha_heuristic_unwind_cache *info
     = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);
 
+  /* This is meant to halt the backtrace at "_start".  Make sure we
+     don't halt it at a generic dummy frame. */
+  if (inside_entry_file (info->start_pc))
+    return;
+
   *this_id = frame_id_build (info->vfp, info->start_pc);
 }
 
 /* Retrieve the value of REGNUM in FRAME.  Don't give up!  */
 
-void
+static void
 alpha_heuristic_frame_prev_register (struct frame_info *next_frame,
 				     void **this_prologue_cache,
 				     int regnum, int *optimizedp,
@@ -954,7 +967,7 @@ alpha_heuristic_frame_p (CORE_ADDR pc)
   return &alpha_heuristic_frame_unwind;
 }
 
-CORE_ADDR
+static CORE_ADDR
 alpha_heuristic_frame_base_address (struct frame_info *next_frame,
 				    void **this_prologue_cache)
 {
diff --git a/gdb/alpha-tdep.h b/gdb/alpha-tdep.h
index 412ec37..5def15a 100644
--- a/gdb/alpha-tdep.h
+++ b/gdb/alpha-tdep.h
@@ -99,19 +99,7 @@ struct gdbarch_tdep
 
 extern unsigned int alpha_read_insn (CORE_ADDR pc);
 extern void alpha_software_single_step (enum target_signal, int);
-
-/* Let other files poke at the heuristic unwinder.  */
 extern CORE_ADDR alpha_after_prologue (CORE_ADDR pc);
-extern struct alpha_heuristic_unwind_cache *
-  alpha_heuristic_frame_unwind_cache (struct frame_info *, void **, CORE_ADDR);
-extern void alpha_heuristic_frame_this_id (struct frame_info *, void **,
-					   struct frame_id *);
-extern void alpha_heuristic_frame_prev_register (struct frame_info *,
-						 void **, int, int *,
-						 enum lval_type *,
-						 CORE_ADDR *, int *, void *);
-extern CORE_ADDR alpha_heuristic_frame_base_address (struct frame_info *,
-						     void **);
 
 extern void alpha_mdebug_init_abi (struct gdbarch_info, struct gdbarch *);