From: Joel Brobecker <brobecker@gnat.com>
Date: Tue, 2 Jul 2002 19:08:55 +0000 (+0000)
Subject:         * frame.h (frame_address_in_block): New function.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=42f99ac23d53ee64774126aa640be47c2cbbd998;p=binutils-gdb.git

    * frame.h (frame_address_in_block): New function.

        * blockframe.c (frame_address_in_block): New function extracted
        from get_frame_block().
        (get_frame_block): Use frame_address_in_block().
        (block_innermost_frame): Use frame_address_in_block() to match
        the frame pc address against the block boundaries rather than
        the frame pc directly. This prevents a failure when a frame pc
        is actually a return-address pointing immediately after the end
        of the given block.
---

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a6576bd65ae..591e7fe6e42 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,16 @@
+2002-07-02  Joel Brobecker  <brobecker@gnat.com>
+
+	* frame.h (frame_address_in_block): New function.
+
+	* blockframe.c (frame_address_in_block): New function extracted
+	from get_frame_block().
+	(get_frame_block): Use frame_address_in_block().
+	(block_innermost_frame): Use frame_address_in_block() to match
+	the frame pc address against the block boundaries rather than
+	the frame pc directly. This prevents a failure when a frame pc
+	is actually a return-address pointing immediately after the end
+	of the given block. 
+
 2002-07-02  Grace Sainsbury  <graces@redhat.com>
 
 	* MAINTAINERS: Add self under write after approval. 
diff --git a/gdb/blockframe.c b/gdb/blockframe.c
index 9971e5dff33..8f95a891291 100644
--- a/gdb/blockframe.c
+++ b/gdb/blockframe.c
@@ -528,6 +528,26 @@ get_frame_pc (struct frame_info *frame)
   return frame->pc;
 }
 
+/* return the address of the PC for the given FRAME, ie the current PC value
+   if FRAME is the innermost frame, or the address adjusted to point to the
+   call instruction if not.  */
+
+CORE_ADDR
+frame_address_in_block (struct frame_info *frame)
+{
+  CORE_ADDR pc = frame->pc;
+
+  /* If we are not in the innermost frame, and we are not interrupted
+     by a signal, frame->pc points to the instruction following the
+     call. As a consequence, we need to get the address of the previous
+     instruction. Unfortunately, this is not straightforward to do, so
+     we just use the address minus one, which is a good enough
+     approximation.  */
+  if (frame->next != 0 && frame->next->signal_handler_caller == 0)
+    --pc;
+
+  return pc;
+}
 
 #ifdef FRAME_FIND_SAVED_REGS
 /* XXX - deprecated.  This is a compatibility function for targets
@@ -576,17 +596,7 @@ get_frame_saved_regs (struct frame_info *frame,
 struct block *
 get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
 {
-  CORE_ADDR pc;
-
-  pc = frame->pc;
-  if (frame->next != 0 && frame->next->signal_handler_caller == 0)
-    /* We are not in the innermost frame and we were not interrupted
-       by a signal.  We need to subtract one to get the correct block,
-       in case the call instruction was the last instruction of the block.
-       If there are any machines on which the saved pc does not point to
-       after the call insn, we probably want to make frame->pc point after
-       the call insn anyway.  */
-    --pc;
+  const CORE_ADDR pc = frame_address_in_block (frame);
 
   if (addr_in_block)
     *addr_in_block = pc;
@@ -970,6 +980,7 @@ block_innermost_frame (struct block *block)
   struct frame_info *frame;
   register CORE_ADDR start;
   register CORE_ADDR end;
+  CORE_ADDR calling_pc;
 
   if (block == NULL)
     return NULL;
@@ -983,7 +994,8 @@ block_innermost_frame (struct block *block)
       frame = get_prev_frame (frame);
       if (frame == NULL)
 	return NULL;
-      if (frame->pc >= start && frame->pc < end)
+      calling_pc = frame_address_in_block (frame);
+      if (calling_pc >= start && calling_pc < end)
 	return frame;
     }
 }
diff --git a/gdb/frame.h b/gdb/frame.h
index d3bd2ab4d51..20ffff00daf 100644
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -250,6 +250,8 @@ extern struct symbol *get_frame_function (struct frame_info *);
 
 extern CORE_ADDR get_frame_pc (struct frame_info *);
 
+extern CORE_ADDR frame_address_in_block (struct frame_info *);
+
 extern CORE_ADDR get_pc_function_start (CORE_ADDR);
 
 extern struct block *block_for_pc (CORE_ADDR);