[RFA] Debug info detection.

[Michal Ludvig <mludvig@suse.cz>]

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Hi all,
The attached patch adds new function cfi_have_unwind_info() that I'll 
use for detection, whether a given function has a dwarf2 unwind info 
(from .eh_frame or .debug_frame) or not. I'll use it in the upcomming 
x86_64_frame_p() to detect which set of unwind functions should be 
returned for a given frame.

OK to commit?

Michal Ludvig
-- 
* SuSE CR, s.r.o     * mludvig@suse.cz
* (+420) 296.545.373 * http://www.suse.cz

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2003-03-06  Michal Ludvig  <mludvig@suse.cz>

	* dwarf2cfi.c (cfi_have_unwind_info): New function.
	* dwarf2cfi.h (cfi_have_unwind_info): New prototype.

Index: dwarf2cfi.c
===================================================================
RCS file: /cvs/src/src/gdb/dwarf2cfi.c,v
retrieving revision 1.31
diff -u -p -r1.31 dwarf2cfi.c
--- dwarf2cfi.c	10 Feb 2003 11:50:20 -0000	1.31
+++ dwarf2cfi.c	6 Mar 2003 22:57:56 -0000
@@ -835,6 +835,12 @@ frame_state_for (struct context *context
 		       fde->data + fde->data_length, context, fs);
 }
 
+struct fde_unit *
+cfi_have_unwind_info (CORE_ADDR pc)
+{
+  return get_fde_for_addr (pc);
+}
+
 static void
 get_reg (char *reg, struct context *context, int regnum)
 {
Index: dwarf2cfi.h
===================================================================
RCS file: /cvs/src/src/gdb/dwarf2cfi.h,v
retrieving revision 1.4
diff -u -p -r1.4 dwarf2cfi.h
--- dwarf2cfi.h	9 Dec 2002 02:04:16 -0000	1.4
+++ dwarf2cfi.h	6 Mar 2003 22:57:56 -0000
@@ -75,6 +75,9 @@ void cfi_init_extra_frame_info (int from
 /* Obtain return address of the frame.  */
 CORE_ADDR cfi_get_ra (struct frame_info *fi);
 
+/* Check if there is an unwind info for a given PC.  */
+struct fde_unit *cfi_have_unwind_info (CORE_ADDR pc);
+
 /* Find register number REGNUM relative to FRAME and put its
    (raw) contents in *RAW_BUFFER.  Set *OPTIMIZED if the variable
    was optimized out (and thus can't be fetched).  If the variable