libsframe: stop search for SFrame FRE if its start IP is greater than PC

The SFrame FREs for an SFrame FDE are sorted on their start address.
Therefore the linear search for a matching SFrame FRE can be stopped,
if its start address is greater than the searched for PC.

libsframe/
	* sframe.c (sframe_find_fre): Stop search if FRE's start IP is
	greater than PC.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>

diff --git a/libsframe/sframe.c b/libsframe/sframe.c
index d16305d629b469a856a6c57c1eff4c4b1af02f5c..d03dd5fc5fed9ea5ec542a0fbb89b175e286b36e 100644 (file)
--- a/libsframe/sframe.c
+++ b/libsframe/sframe.c
@@ -1096,14 +1096,13 @@ sframe_find_fre (sframe_decoder_ctx *ctx, int32_t pc,
 {
   sframe_frame_row_entry cur_fre;
   sframe_func_desc_entry *fdep;
-  uint32_t fre_type, fde_type, i;
+  uint32_t fre_type, i;
   int32_t start_ip_offset;
   int32_t func_start_addr;
   int32_t end_ip_offset;
   const char *fres;
   size_t size = 0;
   int err = 0;
-  bool mask_p;
 
   if ((ctx == NULL) || (frep == NULL))
     return sframe_set_errno (&err, SFRAME_ERR_INVAL);
@@ -1114,8 +1113,6 @@ sframe_find_fre (sframe_decoder_ctx *ctx, int32_t pc,
     return sframe_set_errno (&err, SFRAME_ERR_DCTX_INVAL);
 
   fre_type = sframe_get_fre_type (fdep);
-  fde_type = sframe_get_fde_type (fdep);
-  mask_p = (fde_type == SFRAME_FDE_TYPE_PCMASK);
 
   fres = ctx->sfd_fres + fdep->sfde_func_start_fre_off;
   func_start_addr = fdep->sfde_func_start_address;
@@ -1129,8 +1126,8 @@ sframe_find_fre (sframe_decoder_ctx *ctx, int32_t pc,
      start_ip_offset = cur_fre.fre_start_addr;
      end_ip_offset = sframe_fre_get_end_ip_offset (fdep, i, fres + size);
 
-     /* First FRE's start_ip must be more than pc for regular SFrame FDEs.  */
-     if (i == 0 && !mask_p && (start_ip_offset + func_start_addr) > pc)
+     /* Stop search if FRE's start_ip is greater than pc.  */
+     if ((start_ip_offset + func_start_addr) > pc)
        return sframe_set_errno (&err, SFRAME_ERR_FRE_INVAL);
 
      if (sframe_fre_check_range_p (fdep, start_ip_offset, end_ip_offset, pc))