Simple -Wshadow=local fixes

This fixes all the straightforward -Wshadow=local warnings in gdb.  A
few standard approaches are used here:

* Renaming an inner (or outer, but more commonly inner) variable;
* Lowering a declaration to avoid a clash;
* Moving a declaration into a more inner scope to avoid a clash,
  including the special case of moving a declaration into a loop header.

I did not consider any of the changes in this patch to be particularly
noteworthy, though of course they should all still be examined.

gdb/ChangeLog
2018-10-04  Tom Tromey  <tom@tromey.com>

	* ctf.c (SET_ARRAY_FIELD): Rename "u32".
	* p-valprint.c (pascal_val_print): Split inner "i" variable.
	* xtensa-tdep.c (xtensa_push_dummy_call): Declare "i" in loop
	header.
	* xstormy16-tdep.c (xstormy16_push_dummy_call): Declare "val" in
	more inner scope.
	* xcoffread.c (read_xcoff_symtab): Rename inner "symbol".
	* varobj.c (varobj_update): Rename inner "newobj",
	"type_changed".
	* valprint.c (generic_emit_char): Rename inner "buf".
	* valops.c (find_overload_match): Rename inner "temp".
	(value_struct_elt_for_reference): Declare "v" in more inner
	scope.
	* v850-tdep.c (v850_push_dummy_call): Rename "len".
	* unittests/array-view-selftests.c (run_tests): Rename inner
	"vec".
	* tui/tui-stack.c (tui_show_frame_info): Declare "i" in loop
	header.
	* tracepoint.c (merge_uploaded_trace_state_variables): Declare
	"tsv" in more inner scope.
	(print_one_static_tracepoint_marker): Rename inner
	"tuple_emitter".
	* tic6x-tdep.c (tic6x_analyze_prologue): Declare "inst" lower.
	(tic6x_push_dummy_call): Don't redeclare "addr".
	* target-float.c: Declare "dto" lower.
	* symtab.c (lookup_local_symbol): Rename inner "sym".
	(find_pc_sect_line): Rename inner "pc".
	* stack.c (print_frame): Don't redeclare "gdbarch".
	(return_command): Rename inner "gdbarch".
	* s390-tdep.c (s390_prologue_frame_unwind_cache): Renam inner
	"sp".
	* rust-lang.c (rust_internal_print_type): Declare "i" in loop
	header.
	* rs6000-tdep.c (ppc_process_record): Rename inner "addr".
	* riscv-tdep.c (riscv_push_dummy_call): Declare "info" in inner
	scope.
	* remote.c (remote_target::update_thread_list): Don't redeclare
	"tp".
	(remote_target::process_initial_stop_replies): Rename inner
	"thread".
	(remote_target::remote_parse_stop_reply): Don't redeclare "p".
	(remote_target::wait_as): Don't redeclare "stop_reply".
	(remote_target::get_thread_local_address): Rename inner
	"result".
	(remote_target::get_tib_address): Likewise.

1 files changed, 12 insertions, 9 deletions

diff --git a/gdb/regcache.c b/gdb/regcache.c
index f3f845a..b2f9b05 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -1609,19 +1609,21 @@ cooked_read_test (struct gdbarch *gdbarch)
 
   /* Test that read one raw register from regcache_no_target will go
      to the target layer.  */
-  int regnum;
 
   /* Find a raw register which size isn't zero.  */
-  for (regnum = 0; regnum < gdbarch_num_regs (gdbarch); regnum++)
+  int nonzero_regnum;
+  for (nonzero_regnum = 0;
+       nonzero_regnum < gdbarch_num_regs (gdbarch);
+       nonzero_regnum++)
     {
-      if (register_size (gdbarch, regnum) != 0)
+      if (register_size (gdbarch, nonzero_regnum) != 0)
 	break;
     }
 
   readwrite_regcache readwrite (gdbarch);
-  gdb::def_vector<gdb_byte> buf (register_size (gdbarch, regnum));
+  gdb::def_vector<gdb_byte> buf (register_size (gdbarch, nonzero_regnum));
 
-  readwrite.raw_read (regnum, buf.data ());
+  readwrite.raw_read (nonzero_regnum, buf.data ());
 
   /* raw_read calls target_fetch_registers.  */
   SELF_CHECK (mock_target.fetch_registers_called > 0);
@@ -1642,9 +1644,10 @@ cooked_read_test (struct gdbarch *gdbarch)
       if (register_size (gdbarch, regnum) == 0)
 	continue;
 
-      gdb::def_vector<gdb_byte> buf (register_size (gdbarch, regnum));
+      gdb::def_vector<gdb_byte> inner_buf (register_size (gdbarch, regnum));
 
-      SELF_CHECK (REG_VALID == readwrite.cooked_read (regnum, buf.data ()));
+      SELF_CHECK (REG_VALID == readwrite.cooked_read (regnum,
+						      inner_buf.data ()));
 
       SELF_CHECK (mock_target.fetch_registers_called == 0);
       SELF_CHECK (mock_target.store_registers_called == 0);
@@ -1669,9 +1672,9 @@ cooked_read_test (struct gdbarch *gdbarch)
       if (register_size (gdbarch, regnum) == 0)
 	continue;
 
-      gdb::def_vector<gdb_byte> buf (register_size (gdbarch, regnum));
+      gdb::def_vector<gdb_byte> inner_buf (register_size (gdbarch, regnum));
       enum register_status status = readonly.cooked_read (regnum,
-							  buf.data ());
+							  inner_buf.data ());
 
       if (regnum < gdbarch_num_regs (gdbarch))
 	{