[RFA 13/14] Use std::vector in find_instruction_backward

[Tom Tromey <tom@tromey.com>]

This changes find_instruction_backward to use std::vector, removing a
cleanup.

2017-04-07  Tom Tromey  <tom@tromey.com>

	* printcmd.c (find_instruction_backward): Use std::vector.
---
 gdb/ChangeLog  |  4 ++++
 gdb/printcmd.c | 16 ++++++----------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0a481c2..e46f99d 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,9 @@
 2017-04-07  Tom Tromey  <tom@tromey.com>
 
+	* printcmd.c (find_instruction_backward): Use std::vector.
+
+2017-04-07  Tom Tromey  <tom@tromey.com>
+
 	* symfile.c (objfilep): Remove typedef.
 	(reread_symbols): Use a std::vector.
 
diff --git a/gdb/printcmd.c b/gdb/printcmd.c
index f09f18a..02d6e1c 100644
--- a/gdb/printcmd.c
+++ b/gdb/printcmd.c
@@ -806,9 +806,8 @@ find_instruction_backward (struct gdbarch *gdbarch, CORE_ADDR addr,
   /* The vector PCS is used to store instruction addresses within
      a pc range.  */
   CORE_ADDR loop_start, loop_end, p;
-  VEC (CORE_ADDR) *pcs = NULL;
+  std::vector<CORE_ADDR> pcs;
   struct symtab_and_line sal;
-  struct cleanup *cleanup = make_cleanup (VEC_cleanup (CORE_ADDR), &pcs);
 
   *inst_read = 0;
   loop_start = loop_end = addr;
@@ -822,7 +821,7 @@ find_instruction_backward (struct gdbarch *gdbarch, CORE_ADDR addr,
      instructions from INST_COUNT, and go to the next iteration.  */
   do
     {
-      VEC_truncate (CORE_ADDR, pcs, 0);
+      pcs.clear ();
       sal = find_pc_sect_line (loop_start, NULL, 1);
       if (sal.line <= 0)
         {
@@ -844,12 +843,12 @@ find_instruction_backward (struct gdbarch *gdbarch, CORE_ADDR addr,
          LOOP_START to LOOP_END.  */
       for (p = loop_start; p < loop_end;)
         {
-          VEC_safe_push (CORE_ADDR, pcs, p);
+	  pcs.push_back (p);
           p += gdb_insn_length (gdbarch, p);
         }
 
-      inst_count -= VEC_length (CORE_ADDR, pcs);
-      *inst_read += VEC_length (CORE_ADDR, pcs);
+      inst_count -= pcs.size ();
+      *inst_read += pcs.size ();
     }
   while (inst_count > 0);
 
@@ -875,9 +874,7 @@ find_instruction_backward (struct gdbarch *gdbarch, CORE_ADDR addr,
      The case when the length of PCS is 0 means that we reached an area for
      which line info is not available.  In such case, we return LOOP_START,
      which was the lowest instruction address that had line info.  */
-  p = VEC_length (CORE_ADDR, pcs) > 0
-    ? VEC_index (CORE_ADDR, pcs, -inst_count)
-    : loop_start;
+  p = pcs.size () > 0 ? pcs[-inst_count] : loop_start;
 
   /* INST_READ includes all instruction addresses in a pc range.  Need to
      exclude the beginning part up to the address we're returning.  That
@@ -885,7 +882,6 @@ find_instruction_backward (struct gdbarch *gdbarch, CORE_ADDR addr,
   if (inst_count < 0)
     *inst_read += inst_count;
 
-  do_cleanups (cleanup);
   return p;
 }
 
-- 
2.9.3