| File: | src/gnu/usr.bin/binutils/gdb/std-regs.c |
| Warning: | line 69, column 3 Value stored to 'buf' is never read |
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| 1 | /* Builtin frame register, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 2002 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Red Hat. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 22 | Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "user-regs.h" |
| 26 | #include "frame.h" |
| 27 | #include "gdbtypes.h" |
| 28 | #include "value.h" |
| 29 | #include "gdb_string.h" |
| 30 | |
| 31 | /* Types that describe the various builtin registers. */ |
| 32 | |
| 33 | static struct type *builtin_type_frame_reg; |
| 34 | |
| 35 | /* Constructors for those types. */ |
| 36 | |
| 37 | static void |
| 38 | build_builtin_type_frame_reg (void) |
| 39 | { |
| 40 | /* $frame. */ |
| 41 | if (builtin_type_frame_reg == NULL((void*)0)) |
| 42 | { |
| 43 | #if 0 |
| 44 | struct frame |
| 45 | { |
| 46 | void *base; |
| 47 | }; |
| 48 | #endif |
| 49 | builtin_type_frame_reg = init_composite_type ("frame", TYPE_CODE_STRUCT); |
| 50 | append_composite_type_field (builtin_type_frame_reg, "base", |
| 51 | builtin_type_void_data_ptr); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | static struct value * |
| 56 | value_of_builtin_frame_reg (struct frame_info *frame) |
| 57 | { |
| 58 | struct value *val; |
| 59 | char *buf; |
| 60 | build_builtin_type_frame_reg (); |
| 61 | val = allocate_value (builtin_type_frame_reg); |
| 62 | VALUE_LVAL (val)(val)->lval = not_lval; |
| 63 | buf = VALUE_CONTENTS_RAW (val)((char *) (val)->aligner.contents + (val)->embedded_offset ); |
| 64 | memset (buf, 0, TYPE_LENGTH (VALUE_TYPE (val))((val)->type)->length); |
| 65 | /* frame.base. */ |
| 66 | if (frame != NULL((void*)0)) |
| 67 | ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,(gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr , buf, get_frame_base (frame))) |
| 68 | get_frame_base (frame))(gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr , buf, get_frame_base (frame))); |
| 69 | buf += TYPE_LENGTH (builtin_type_void_data_ptr)(builtin_type_void_data_ptr)->length; |
Value stored to 'buf' is never read | |
| 70 | /* frame.XXX. */ |
| 71 | return val; |
| 72 | } |
| 73 | |
| 74 | static struct value * |
| 75 | value_of_builtin_frame_fp_reg (struct frame_info *frame) |
| 76 | { |
| 77 | if (DEPRECATED_FP_REGNUM(gdbarch_deprecated_fp_regnum (current_gdbarch)) >= 0) |
| 78 | /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the |
| 79 | register name table overrides this built-in $fp register, there |
| 80 | is no real reason for this DEPRECATED_FP_REGNUM trickery here. |
| 81 | An architecture wanting to implement "$fp" as alias for a raw |
| 82 | register can do so by adding "fp" to register name table (mind |
| 83 | you, doing this is probably a dangerous thing). */ |
| 84 | return value_of_register (DEPRECATED_FP_REGNUM(gdbarch_deprecated_fp_regnum (current_gdbarch)), frame); |
| 85 | else |
| 86 | { |
| 87 | struct value *val = allocate_value (builtin_type_void_data_ptr); |
| 88 | char *buf = VALUE_CONTENTS_RAW (val)((char *) (val)->aligner.contents + (val)->embedded_offset ); |
| 89 | if (frame == NULL((void*)0)) |
| 90 | memset (buf, 0, TYPE_LENGTH (VALUE_TYPE (val))((val)->type)->length); |
| 91 | else |
| 92 | ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,(gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr , buf, get_frame_base_address (frame))) |
| 93 | get_frame_base_address (frame))(gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr , buf, get_frame_base_address (frame))); |
| 94 | return val; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | static struct value * |
| 99 | value_of_builtin_frame_pc_reg (struct frame_info *frame) |
| 100 | { |
| 101 | if (PC_REGNUM(gdbarch_pc_regnum (current_gdbarch)) >= 0) |
| 102 | return value_of_register (PC_REGNUM(gdbarch_pc_regnum (current_gdbarch)), frame); |
| 103 | else |
| 104 | { |
| 105 | struct value *val = allocate_value (builtin_type_void_data_ptr); |
| 106 | char *buf = VALUE_CONTENTS_RAW (val)((char *) (val)->aligner.contents + (val)->embedded_offset ); |
| 107 | if (frame == NULL((void*)0)) |
| 108 | memset (buf, 0, TYPE_LENGTH (VALUE_TYPE (val))((val)->type)->length); |
| 109 | else |
| 110 | ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,(gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr , buf, get_frame_pc (frame))) |
| 111 | get_frame_pc (frame))(gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr , buf, get_frame_pc (frame))); |
| 112 | return val; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static struct value * |
| 117 | value_of_builtin_frame_sp_reg (struct frame_info *frame) |
| 118 | { |
| 119 | #ifdef SP_REGNUM(gdbarch_sp_regnum (current_gdbarch)) |
| 120 | if (SP_REGNUM(gdbarch_sp_regnum (current_gdbarch)) >= 0) |
| 121 | return value_of_register (SP_REGNUM(gdbarch_sp_regnum (current_gdbarch)), frame); |
| 122 | #endif |
| 123 | error ("Standard register ``$sp'' is not available for this target"); |
| 124 | } |
| 125 | |
| 126 | static struct value * |
| 127 | value_of_builtin_frame_ps_reg (struct frame_info *frame) |
| 128 | { |
| 129 | #ifdef PS_REGNUM(gdbarch_ps_regnum (current_gdbarch)) |
| 130 | if (PS_REGNUM(gdbarch_ps_regnum (current_gdbarch)) >= 0) |
| 131 | return value_of_register (PS_REGNUM(gdbarch_ps_regnum (current_gdbarch)), frame); |
| 132 | #endif |
| 133 | error ("Standard register ``$ps'' is not available for this target"); |
| 134 | } |
| 135 | |
| 136 | extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */ |
| 137 | |
| 138 | void |
| 139 | _initialize_frame_reg (void) |
| 140 | { |
| 141 | /* FIXME: cagney/2002-02-08: At present the local builtin types |
| 142 | can't be initialized using _initialize*() or gdbarch. Due mainly |
| 143 | to non-multi-arch targets, GDB initializes things piece meal and, |
| 144 | as a consequence can leave these types NULL. */ |
| 145 | DEPRECATED_REGISTER_GDBARCH_SWAP (builtin_type_frame_reg)deprecated_register_gdbarch_swap (&(builtin_type_frame_reg ), sizeof ((builtin_type_frame_reg)), ((void*)0)); |
| 146 | |
| 147 | /* Frame based $fp, $pc, $sp and $ps. These only come into play |
| 148 | when the target does not define its own version of these |
| 149 | registers. */ |
| 150 | user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg); |
| 151 | user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg); |
| 152 | user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg); |
| 153 | user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg); |
| 154 | |
| 155 | /* NOTE: cagney/2002-04-05: For moment leave the $frame / $gdbframe |
| 156 | / $gdb.frame disabled. It isn't yet clear which of the many |
| 157 | options is the best. */ |
| 158 | if (0) |
| 159 | user_reg_add_builtin ("frame", value_of_builtin_frame_reg); |
| 160 | } |