1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
3 Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007,
4 2008 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "expression.h"
25 #include "parser-defs.h"
32 #include "gdb_string.h"
36 extern void _initialize_scheme_language (void);
37 static struct value *evaluate_subexp_scm (struct type *, struct expression *,
39 static struct value *scm_lookup_name (char *);
40 static int in_eval_c (void);
42 struct type *builtin_type_scm;
45 scm_printchar (int c, struct ui_file *stream)
47 fprintf_filtered (stream, "#\\%c", c);
51 scm_printstr (struct ui_file *stream, const gdb_byte *string,
52 unsigned int length, int width, int force_ellipses)
54 fprintf_filtered (stream, "\"%s\"", string);
58 is_scmvalue_type (struct type *type)
60 if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
67 /* Get the INDEX'th SCM value, assuming SVALUE is the address
71 scm_get_field (LONGEST svalue, int index)
74 read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
75 buffer, TYPE_LENGTH (builtin_type_scm));
76 return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
79 /* Unpack a value of type TYPE in buffer VALADDR as an integer
80 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
81 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
84 scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context)
86 if (is_scmvalue_type (type))
88 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
89 if (context == TYPE_CODE_BOOL)
91 if (svalue == SCM_BOOL_F)
96 switch (7 & (int) svalue)
101 case 4: /* other immediate value */
102 if (SCM_ICHRP (svalue)) /* character */
103 return SCM_ICHR (svalue);
104 else if (SCM_IFLAGP (svalue))
106 switch ((int) svalue)
117 error (_("Value can't be converted to integer."));
123 return unpack_long (type, valaddr);
126 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
131 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
133 if (cursal.symtab && cursal.symtab->filename)
135 char *filename = cursal.symtab->filename;
136 int len = strlen (filename);
137 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
143 /* Lookup a value for the variable named STR.
144 First lookup in Scheme context (using the scm_lookup_cstr inferior
145 function), then try lookup_symbol for compiled variables. */
147 static struct value *
148 scm_lookup_name (char *str)
150 struct value *args[3];
151 int len = strlen (str);
155 args[0] = value_allocate_space_in_inferior (len);
156 args[1] = value_from_longest (builtin_type_int, len);
157 write_memory (value_as_long (args[0]), (gdb_byte *) str, len);
160 && (sym = lookup_symbol ("env",
161 expression_context_block,
162 VAR_DOMAIN, (int *) NULL,
163 (struct symtab **) NULL)) != NULL)
164 args[2] = value_of_variable (sym, expression_context_block);
166 /* FIXME in this case, we should try lookup_symbol first */
167 args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
169 func = find_function_in_inferior ("scm_lookup_cstr");
170 val = call_function_by_hand (func, 3, args);
171 if (!value_logical_not (val))
172 return value_ind (val);
174 sym = lookup_symbol (str,
175 expression_context_block,
176 VAR_DOMAIN, (int *) NULL,
177 (struct symtab **) NULL);
179 return value_of_variable (sym, NULL);
180 error (_("No symbol \"%s\" in current context."), str);
184 scm_evaluate_string (char *str, int len)
187 struct value *addr = value_allocate_space_in_inferior (len + 1);
188 LONGEST iaddr = value_as_long (addr);
189 write_memory (iaddr, (gdb_byte *) str, len);
190 /* FIXME - should find and pass env */
191 write_memory (iaddr + len, (gdb_byte *) "", 1);
192 func = find_function_in_inferior ("scm_evstr");
193 return call_function_by_hand (func, 1, &addr);
196 static struct value *
197 evaluate_exp (struct type *expect_type, struct expression *exp,
198 int *pos, enum noside noside)
200 enum exp_opcode op = exp->elts[*pos].opcode;
207 len = longest_to_int (exp->elts[pc + 1].longconst);
208 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
209 if (noside == EVAL_SKIP)
211 str = &exp->elts[pc + 2].string;
212 return scm_lookup_name (str);
215 len = longest_to_int (exp->elts[pc + 1].longconst);
216 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
217 if (noside == EVAL_SKIP)
219 str = &exp->elts[pc + 2].string;
220 return scm_evaluate_string (str, len);
223 return evaluate_subexp_standard (expect_type, exp, pos, noside);
225 return value_from_longest (builtin_type_long, (LONGEST) 1);
228 const struct exp_descriptor exp_descriptor_scm =
230 print_subexp_standard,
231 operator_length_standard,
233 dump_subexp_body_standard,
237 const struct language_defn scm_language_defn =
239 "scheme", /* Language name */
249 scm_printchar, /* Print a character constant */
250 scm_printstr, /* Function to print string constant */
251 NULL, /* Function to print a single character */
252 c_print_type, /* Print a type using appropriate syntax */
253 scm_val_print, /* Print a value using appropriate syntax */
254 scm_value_print, /* Print a top-level value */
255 NULL, /* Language specific skip_trampoline */
256 NULL, /* name_of_this */
257 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
258 basic_lookup_transparent_type,/* lookup_transparent_type */
259 NULL, /* Language specific symbol demangler */
260 NULL, /* Language specific class_name_from_physname */
261 NULL, /* expression operators for printing */
262 1, /* c-style arrays */
263 0, /* String lower bound */
264 default_word_break_characters,
265 default_make_symbol_completion_list,
266 c_language_arch_info,
267 default_print_array_index,
268 default_pass_by_reference,
273 _initialize_scheme_language (void)
275 add_language (&scm_language_defn);
277 init_type (TYPE_CODE_INT,
278 gdbarch_long_bit (current_gdbarch) / TARGET_CHAR_BIT,
279 0, "SCM", (struct objfile *) NULL);