Remove unused variables

This patch removes set-but-unused variables.  This holds all the
removals I consider to be simple and relatively uncontroversial.

2016-07-14  Tom Tromey  <tom@tromey.com>

	* mips-tdep.c (micromips_scan_prologue): Remove "frame_addr".
	(mips_o32_push_dummy_call): Remove "stack_used_p".
	* aarch64-tdep.c (aarch64_record_data_proc_imm): Remove
	"insn_bit28".
	* rust-lang.c (rust_print_type): Remove "len".
	* rust-exp.y (super_name): Remove "current_len".
	* python/py-framefilter.c (py_print_type): Remove "type".
	* mdebugread.c (parse_partial_symbols): Remove
	"past_first_source_file".
	<N_SO>: Remove "valu", "first_so_symnum", "prev_textlow_not_set".
	* m2-valprint.c (m2_print_unbounded_array): Remove
	"content_type".
	(m2_val_print): Remove "i".
	* linespec.c (unexpected_linespec_error): Remove "cleanup".
	* f-valprint.c (f_val_print): Remove "i".
	* elfread.c (elf_symtab_read): Remove "offset".
	* dwarf2-frame.c (dwarf2_fetch_cfa_info): Remove "addr_size".
	* jit.c (jit_dealloc_cache): Remove "i" and "frame_arch".

gdb/ChangeLog

@@ -1,3 +1,24 @@
+2016-07-14  Tom Tromey  <tom@tromey.com>
+
+	* mips-tdep.c (micromips_scan_prologue): Remove "frame_addr".
+	(mips_o32_push_dummy_call): Remove "stack_used_p".
+	* aarch64-tdep.c (aarch64_record_data_proc_imm): Remove
+	"insn_bit28".
+	* rust-lang.c (rust_print_type): Remove "len".
+	* rust-exp.y (super_name): Remove "current_len".
+	* python/py-framefilter.c (py_print_type): Remove "type".
+	* mdebugread.c (parse_partial_symbols): Remove
+	"past_first_source_file".
+	<N_SO>: Remove "valu", "first_so_symnum", "prev_textlow_not_set".
+	* m2-valprint.c (m2_print_unbounded_array): Remove
+	"content_type".
+	(m2_val_print): Remove "i".
+	* linespec.c (unexpected_linespec_error): Remove "cleanup".
+	* f-valprint.c (f_val_print): Remove "i".
+	* elfread.c (elf_symtab_read): Remove "offset".
+	* dwarf2-frame.c (dwarf2_fetch_cfa_info): Remove "addr_size".
+	* jit.c (jit_dealloc_cache): Remove "i" and "frame_arch".
+
 2016-07-14  Tom Tromey  <tom@tromey.com>
 
 	* arch-utils.c (default_skip_permanent_breakpoint): Remove

gdb/aarch64-tdep.c

@@ -2981,11 +2981,10 @@ aarch64_record_data_proc_reg (insn_decode_record *aarch64_insn_r)
 static unsigned int
 aarch64_record_data_proc_imm (insn_decode_record *aarch64_insn_r)
 {
-  uint8_t reg_rd, insn_bit28, insn_bit23, insn_bits24_27, setflags;
+  uint8_t reg_rd, insn_bit23, insn_bits24_27, setflags;
   uint32_t record_buf[4];
 
   reg_rd = bits (aarch64_insn_r->aarch64_insn, 0, 4);
-  insn_bit28 = bit (aarch64_insn_r->aarch64_insn, 28);
   insn_bit23 = bit (aarch64_insn_r->aarch64_insn, 23);
   insn_bits24_27 = bits (aarch64_insn_r->aarch64_insn, 24, 27);
 

gdb/dwarf2-frame.c

@@ -908,7 +908,6 @@ dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc,
   struct dwarf2_fde *fde;
   CORE_ADDR text_offset;
   struct dwarf2_frame_state fs;
-  int addr_size;
 
   memset (&fs, 0, sizeof (struct dwarf2_frame_state));
 
@@ -923,7 +922,6 @@ dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc,
   fs.data_align = fde->cie->data_alignment_factor;
   fs.code_align = fde->cie->code_alignment_factor;
   fs.retaddr_column = fde->cie->return_address_register;
-  addr_size = fde->cie->addr_size;
 
   /* Check for "quirks" - known bugs in producers.  */
   dwarf2_frame_find_quirks (&fs, fde);

gdb/elfread.c

@@ -233,7 +233,6 @@ elf_symtab_read (struct objfile *objfile, int type,
   asymbol *sym;
   long i;
   CORE_ADDR symaddr;
-  CORE_ADDR offset;
   enum minimal_symbol_type ms_type;
   /* Name of the last file symbol.  This is either a constant string or is
      saved on the objfile's filename cache.  */
@@ -263,8 +262,6 @@ elf_symtab_read (struct objfile *objfile, int type,
 	  continue;
 	}
 
-      offset = ANOFFSET (objfile->section_offsets,
-			 gdb_bfd_section_index (objfile->obfd, sym->section));
       if (type == ST_DYNAMIC
 	  && sym->section == bfd_und_section_ptr
 	  && (sym->flags & BSF_FUNCTION))

gdb/f-valprint.c

@@ -218,7 +218,6 @@ f_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 {
   struct gdbarch *gdbarch = get_type_arch (type);
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  unsigned int i = 0;	/* Number of characters printed.  */
   int printed_field = 0; /* Number of fields printed.  */
   struct type *elttype;
   CORE_ADDR addr;
@@ -293,7 +292,7 @@ f_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 	    {
 	      if (want_space)
 		fputs_filtered (" ", stream);
-	      i = val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
+	      val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 				stream, options);
 	    }
 	  return;

gdb/jit.c

@@ -1171,12 +1171,8 @@ static void
 jit_dealloc_cache (struct frame_info *this_frame, void *cache)
 {
   struct jit_unwind_private *priv_data = (struct jit_unwind_private *) cache;
-  struct gdbarch *frame_arch;
-  int i;
 
   gdb_assert (priv_data->regcache != NULL);
-  frame_arch = get_frame_arch (priv_data->this_frame);
-
   regcache_xfree (priv_data->regcache);
   xfree (priv_data);
 }

gdb/linespec.c

@@ -1519,10 +1519,9 @@ unexpected_linespec_error (linespec_parser *parser)
       || token.type == LSTOKEN_KEYWORD)
     {
       char *string;
-      struct cleanup *cleanup;
 
       string = copy_token_string (token);
-      cleanup = make_cleanup (xfree, string);
+      make_cleanup (xfree, string);
       throw_error (GENERIC_ERROR,
 		   _("malformed linespec error: unexpected %s, \"%s\""),
 		   token_type_strings[token.type], string);

gdb/m2-valprint.c

@@ -162,13 +162,11 @@ m2_print_unbounded_array (struct type *type, const gdb_byte *valaddr,
 			  struct ui_file *stream, int recurse,
 			  const struct value_print_options *options)
 {
-  struct type *content_type;
   CORE_ADDR addr;
   LONGEST len;
   struct value *val;
 
   type = check_typedef (type);
-  content_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0));
 
   addr = unpack_pointer (TYPE_FIELD_TYPE (type, 0),
 			 (TYPE_FIELD_BITPOS (type, 0) / 8) +
@@ -316,7 +314,6 @@ m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 	      const struct value_print_options *options)
 {
   struct gdbarch *gdbarch = get_type_arch (type);
-  unsigned int i = 0;	/* Number of characters printed.  */
   unsigned len;
   struct type *elttype;
   CORE_ADDR addr;
@@ -355,7 +352,6 @@ m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 	      LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
 			       valaddr + embedded_offset, len, NULL,
 			       0, options);
-	      i = len;
 	    }
 	  else
 	    {

gdb/mdebugread.c

@@ -2368,7 +2368,6 @@ parse_partial_symbols (struct objfile *objfile)
   SYMR sh;
   struct partial_symtab *pst;
   int textlow_not_set = 1;
-  int past_first_source_file = 0;
 
   /* List of current psymtab's include files.  */
   const char **psymtab_include_list;
@@ -2957,16 +2956,8 @@ parse_partial_symbols (struct objfile *objfile)
 
 		  case N_SO:
 		    {
-		      CORE_ADDR valu;
 		      static int prev_so_symnum = -10;
-		      static int first_so_symnum;
 		      const char *p;
-		      int prev_textlow_not_set;
-
-		      valu = sh.value + ANOFFSET (objfile->section_offsets,
-						  SECT_OFF_TEXT (objfile));
-
-		      prev_textlow_not_set = textlow_not_set;
 
 		      /* A zero value is probably an indication for the
 			 SunPRO 3.0 compiler.  dbx_end_psymtab explicitly tests
@@ -2974,19 +2965,12 @@ parse_partial_symbols (struct objfile *objfile)
 
 		      if (sh.value == 0
 			  && gdbarch_sofun_address_maybe_missing (gdbarch))
-			{
 			textlow_not_set = 1;
-			  valu = 0;
-			}
 		      else
 			textlow_not_set = 0;
 
-		      past_first_source_file = 1;
-
 		      if (prev_so_symnum != symnum - 1)
 			{		/* Here if prev stab wasn't N_SO.  */
-			  first_so_symnum = symnum;
-
 			  if (pst)
 			    {
 			      pst = (struct partial_symtab *) 0;

gdb/mips-tdep.c

@@ -2939,7 +2939,6 @@ micromips_scan_prologue (struct gdbarch *gdbarch,
   int non_prologue_insns = 0;
   long frame_offset = 0;	/* Size of stack frame.  */
   long frame_adjust = 0;	/* Offset of FP from SP.  */
-  CORE_ADDR frame_addr = 0;	/* Value of $30, used as frame pointer.  */
   int prev_delay_slot = 0;
   int in_delay_slot;
   CORE_ADDR prev_pc;
@@ -3068,7 +3067,6 @@ micromips_scan_prologue (struct gdbarch *gdbarch,
 	      else if (sreg == MIPS_SP_REGNUM && dreg == 30)
 				/* (D)ADDIU $fp, $sp, imm */
 		{
-		  frame_addr = sp + offset;
 		  frame_adjust = offset;
 		  frame_reg = 30;
 		}
@@ -3144,10 +3142,7 @@ micromips_scan_prologue (struct gdbarch *gdbarch,
 	      dreg = b5s5_reg (insn);
 	      if (sreg == MIPS_SP_REGNUM && dreg == 30)
 				/* MOVE  $fp, $sp */
-		{
-		  frame_addr = sp;
 		frame_reg = 30;
-		}
 	      else if ((sreg & 0x1c) != 0x4)
 				/* MOVE  reg, $a0-$a3 */
 		this_non_prologue_insn = 1;
@@ -5502,8 +5497,6 @@ mips_o32_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
 	    }
 	  while (len > 0)
 	    {
-	      /* Remember if the argument was written to the stack.  */
-	      int stack_used_p = 0;
 	      int partial_len = (len < MIPS32_REGSIZE ? len : MIPS32_REGSIZE);
 
 	      if (mips_debug)
@@ -5518,7 +5511,6 @@ mips_o32_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
 		     promoted to int before being stored?  */
 		  int longword_offset = 0;
 		  CORE_ADDR addr;
-		  stack_used_p = 1;
 
 		  if (mips_debug)
 		    {
@@ -5960,8 +5952,6 @@ mips_o64_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
 				  && len % MIPS64_REGSIZE != 0);
 	  while (len > 0)
 	    {
-	      /* Remember if the argument was written to the stack.  */
-	      int stack_used_p = 0;
 	      int partial_len = (len < MIPS64_REGSIZE ? len : MIPS64_REGSIZE);
 
 	      if (mips_debug)
@@ -5976,7 +5966,6 @@ mips_o64_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
 		     promoted to int before being stored?  */
 		  int longword_offset = 0;
 		  CORE_ADDR addr;
-		  stack_used_p = 1;
 		  if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
 		    {
 		      if ((typecode == TYPE_CODE_INT

gdb/python/py-framefilter.c

@@ -211,13 +211,12 @@ py_print_type (struct ui_out *out, struct value *val)
 
   TRY
     {
-      struct type *type;
       struct ui_file *stb;
       struct cleanup *cleanup;
 
       stb = mem_fileopen ();
       cleanup = make_cleanup_ui_file_delete (stb);
-      type = check_typedef (value_type (val));
+      check_typedef (value_type (val));
       type_print (value_type (val), "", stb, -1);
       ui_out_field_stream (out, "type", stb);
       do_cleanups (cleanup);

gdb/rust-exp.y

@@ -968,17 +968,15 @@ super_name (const struct rust_op *ident, unsigned int n_supers)
       int i;
       int len;
       VEC (int) *offsets = NULL;
-      unsigned int current_len, previous_len;
+      unsigned int current_len;
       struct cleanup *cleanup;
 
       cleanup = make_cleanup (VEC_cleanup (int), &offsets);
       current_len = cp_find_first_component (scope);
-      previous_len = 0;
       while (scope[current_len] != '\0')
 	{
 	  VEC_safe_push (int, offsets, current_len);
 	  gdb_assert (scope[current_len] == ':');
-	  previous_len = current_len;
 	  /* The "::".  */
 	  current_len += 2;
 	  current_len += cp_find_first_component (scope

gdb/rust-lang.c

@@ -888,7 +888,6 @@ rust_print_type (struct type *type, const char *varstring,
 	  {
 	    fputs_filtered (TYPE_TAG_NAME (type), stream);
 	    fputs_filtered (" ", stream);
-	    len = strlen (TYPE_TAG_NAME (type));
 	  }
 	fputs_filtered ("{\n", stream);