| 1 | /* Support for printing Go values for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 2012-2016 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | |
| 20 | NOTE: This currently only provides special support for printing gccgo |
| 21 | strings. 6g objects are handled in Python. |
| 22 | The remaining gccgo types may also be handled in Python. |
| 23 | Strings are handled specially here, at least for now, in case the Python |
| 24 | support is unavailable. */ |
| 25 | |
| 26 | #include "defs.h" |
| 27 | #include "gdbtypes.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "go-lang.h" |
| 30 | #include "c-lang.h" |
| 31 | #include "valprint.h" |
| 32 | |
| 33 | /* Print a Go string. |
| 34 | |
| 35 | Note: We assume |
| 36 | gdb_assert (go_classify_struct_type (type) == GO_TYPE_STRING). */ |
| 37 | |
| 38 | static void |
| 39 | print_go_string (struct type *type, const gdb_byte *valaddr, |
| 40 | int embedded_offset, CORE_ADDR address, |
| 41 | struct ui_file *stream, int recurse, |
| 42 | const struct value *val, |
| 43 | const struct value_print_options *options) |
| 44 | { |
| 45 | struct gdbarch *gdbarch = get_type_arch (type); |
| 46 | struct type *elt_ptr_type = TYPE_FIELD_TYPE (type, 0); |
| 47 | struct type *elt_type = TYPE_TARGET_TYPE (elt_ptr_type); |
| 48 | LONGEST length; |
| 49 | /* TODO(dje): The encapsulation of what a pointer is belongs in value.c. |
| 50 | I.e. If there's going to be unpack_pointer, there should be |
| 51 | unpack_value_field_as_pointer. Do this until we can get |
| 52 | unpack_value_field_as_pointer. */ |
| 53 | LONGEST addr; |
| 54 | |
| 55 | gdb_assert (valaddr == value_contents_for_printing_const (val)); |
| 56 | |
| 57 | if (! unpack_value_field_as_long (type, valaddr, embedded_offset, 0, |
| 58 | val, &addr)) |
| 59 | error (_("Unable to read string address")); |
| 60 | |
| 61 | if (! unpack_value_field_as_long (type, valaddr, embedded_offset, 1, |
| 62 | val, &length)) |
| 63 | error (_("Unable to read string length")); |
| 64 | |
| 65 | /* TODO(dje): Print address of struct or actual string? */ |
| 66 | if (options->addressprint) |
| 67 | { |
| 68 | fputs_filtered (paddress (gdbarch, addr), stream); |
| 69 | fputs_filtered (" ", stream); |
| 70 | } |
| 71 | |
| 72 | if (length < 0) |
| 73 | { |
| 74 | fputs_filtered (_("<invalid length: "), stream); |
| 75 | fputs_filtered (plongest (addr), stream); |
| 76 | fputs_filtered (">", stream); |
| 77 | return; |
| 78 | } |
| 79 | |
| 80 | /* TODO(dje): Perhaps we should pass "UTF8" for ENCODING. |
| 81 | The target encoding is a global switch. |
| 82 | Either choice is problematic. */ |
| 83 | val_print_string (elt_type, NULL, addr, length, stream, options); |
| 84 | } |
| 85 | |
| 86 | /* Implements the la_val_print routine for language Go. */ |
| 87 | |
| 88 | void |
| 89 | go_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset, |
| 90 | CORE_ADDR address, struct ui_file *stream, int recurse, |
| 91 | const struct value *val, |
| 92 | const struct value_print_options *options) |
| 93 | { |
| 94 | type = check_typedef (type); |
| 95 | |
| 96 | switch (TYPE_CODE (type)) |
| 97 | { |
| 98 | case TYPE_CODE_STRUCT: |
| 99 | { |
| 100 | enum go_type go_type = go_classify_struct_type (type); |
| 101 | |
| 102 | switch (go_type) |
| 103 | { |
| 104 | case GO_TYPE_STRING: |
| 105 | if (! options->raw) |
| 106 | { |
| 107 | print_go_string (type, valaddr, embedded_offset, address, |
| 108 | stream, recurse, val, options); |
| 109 | return; |
| 110 | } |
| 111 | break; |
| 112 | default: |
| 113 | break; |
| 114 | } |
| 115 | } |
| 116 | /* Fall through. */ |
| 117 | |
| 118 | default: |
| 119 | c_val_print (type, valaddr, embedded_offset, address, stream, |
| 120 | recurse, val, options); |
| 121 | break; |
| 122 | } |
| 123 | } |