| /* Support for printing Go values for GDB, the GNU debugger. |
| |
| Copyright (C) 2012-2015 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. |
| |
| NOTE: This currently only provides special support for printing gccgo |
| strings. 6g objects are handled in Python. |
| The remaining gccgo types may also be handled in Python. |
| Strings are handled specially here, at least for now, in case the Python |
| support is unavailable. */ |
| |
| #include "defs.h" |
| #include "gdbtypes.h" |
| #include "gdbcore.h" |
| #include "go-lang.h" |
| #include "c-lang.h" |
| #include "valprint.h" |
| |
| /* Print a Go string. |
| |
| Note: We assume |
| gdb_assert (go_classify_struct_type (type) == GO_TYPE_STRING). */ |
| |
| static void |
| print_go_string (struct type *type, const gdb_byte *valaddr, |
| int embedded_offset, CORE_ADDR address, |
| struct ui_file *stream, int recurse, |
| const struct value *val, |
| const struct value_print_options *options) |
| { |
| struct gdbarch *gdbarch = get_type_arch (type); |
| struct type *elt_ptr_type = TYPE_FIELD_TYPE (type, 0); |
| struct type *elt_type = TYPE_TARGET_TYPE (elt_ptr_type); |
| LONGEST length; |
| /* TODO(dje): The encapsulation of what a pointer is belongs in value.c. |
| I.e. If there's going to be unpack_pointer, there should be |
| unpack_value_field_as_pointer. Do this until we can get |
| unpack_value_field_as_pointer. */ |
| LONGEST addr; |
| |
| gdb_assert (valaddr == value_contents_for_printing_const (val)); |
| |
| if (! unpack_value_field_as_long (type, valaddr, embedded_offset, 0, |
| val, &addr)) |
| error (_("Unable to read string address")); |
| |
| if (! unpack_value_field_as_long (type, valaddr, embedded_offset, 1, |
| val, &length)) |
| error (_("Unable to read string length")); |
| |
| /* TODO(dje): Print address of struct or actual string? */ |
| if (options->addressprint) |
| { |
| fputs_filtered (paddress (gdbarch, addr), stream); |
| fputs_filtered (" ", stream); |
| } |
| |
| if (length < 0) |
| { |
| fputs_filtered (_("<invalid length: "), stream); |
| fputs_filtered (plongest (addr), stream); |
| fputs_filtered (">", stream); |
| return; |
| } |
| |
| /* TODO(dje): Perhaps we should pass "UTF8" for ENCODING. |
| The target encoding is a global switch. |
| Either choice is problematic. */ |
| val_print_string (elt_type, NULL, addr, length, stream, options); |
| } |
| |
| /* Implements the la_val_print routine for language Go. */ |
| |
| void |
| go_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset, |
| CORE_ADDR address, struct ui_file *stream, int recurse, |
| const struct value *val, |
| const struct value_print_options *options) |
| { |
| type = check_typedef (type); |
| |
| switch (TYPE_CODE (type)) |
| { |
| case TYPE_CODE_STRUCT: |
| { |
| enum go_type go_type = go_classify_struct_type (type); |
| |
| switch (go_type) |
| { |
| case GO_TYPE_STRING: |
| if (! options->raw) |
| { |
| print_go_string (type, valaddr, embedded_offset, address, |
| stream, recurse, val, options); |
| return; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| /* Fall through. */ |
| |
| default: |
| c_val_print (type, valaddr, embedded_offset, address, stream, |
| recurse, val, options); |
| break; |
| } |
| } |