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124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/* Support for printing Go values for GDB, the GNU debugger.
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Copyright (C) 2012-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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NOTE: This currently only provides special support for printing gccgo
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strings. 6g objects are handled in Python.
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The remaining gccgo types may also be handled in Python.
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Strings are handled specially here, at least for now, in case the Python
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support is unavailable. */
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#include "defs.h"
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#include "gdbtypes.h"
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#include "gdbcore.h"
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#include "go-lang.h"
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#include "c-lang.h"
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#include "valprint.h"
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/* Print a Go string.
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Note: We assume
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gdb_assert (go_classify_struct_type (type) == GO_TYPE_STRING). */
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static void
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print_go_string (struct type *type,
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LONGEST embedded_offset, CORE_ADDR address,
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struct ui_file *stream, int recurse,
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struct value *val,
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const struct value_print_options *options)
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{
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struct gdbarch *gdbarch = get_type_arch (type);
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struct type *elt_ptr_type = TYPE_FIELD_TYPE (type, 0);
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struct type *elt_type = TYPE_TARGET_TYPE (elt_ptr_type);
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LONGEST length;
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/* TODO(dje): The encapsulation of what a pointer is belongs in value.c.
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I.e. If there's going to be unpack_pointer, there should be
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unpack_value_field_as_pointer. Do this until we can get
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unpack_value_field_as_pointer. */
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LONGEST addr;
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const gdb_byte *valaddr = value_contents_for_printing (val);
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if (! unpack_value_field_as_long (type, valaddr, embedded_offset, 0,
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val, &addr))
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error (_("Unable to read string address"));
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if (! unpack_value_field_as_long (type, valaddr, embedded_offset, 1,
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val, &length))
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error (_("Unable to read string length"));
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/* TODO(dje): Print address of struct or actual string? */
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if (options->addressprint)
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{
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fputs_filtered (paddress (gdbarch, addr), stream);
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fputs_filtered (" ", stream);
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}
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if (length < 0)
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{
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fputs_filtered (_("<invalid length: "), stream);
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fputs_filtered (plongest (addr), stream);
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fputs_filtered (">", stream);
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return;
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}
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/* TODO(dje): Perhaps we should pass "UTF8" for ENCODING.
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The target encoding is a global switch.
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Either choice is problematic. */
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val_print_string (elt_type, NULL, addr, length, stream, options);
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}
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/* Implements the la_val_print routine for language Go. */
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void
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go_val_print (struct type *type, int embedded_offset,
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CORE_ADDR address, struct ui_file *stream, int recurse,
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struct value *val,
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const struct value_print_options *options)
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{
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type = check_typedef (type);
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switch (TYPE_CODE (type))
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{
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case TYPE_CODE_STRUCT:
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{
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enum go_type go_type = go_classify_struct_type (type);
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switch (go_type)
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{
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case GO_TYPE_STRING:
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if (! options->raw)
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{
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print_go_string (type, embedded_offset, address,
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stream, recurse, val, options);
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return;
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}
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break;
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default:
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break;
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}
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}
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/* Fall through. */
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default:
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c_val_print (type, embedded_offset, address, stream,
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recurse, val, options);
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break;
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}
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}
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