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d4310edb LC |
1 | /* Scheme/Guile language support routines for GDB, the GNU debugger. |
2 | ||
9b254dd1 | 3 | Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007, |
4c38e0a4 | 4 | 2008, 2009, 2010 Free Software Foundation, Inc. |
d4310edb LC |
5 | |
6 | This file is part of GDB. | |
7 | ||
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
d4310edb LC |
11 | (at your option) any later version. |
12 | ||
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. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
d4310edb LC |
20 | |
21 | #include "defs.h" | |
22 | #include "symtab.h" | |
23 | #include "gdbtypes.h" | |
24 | #include "expression.h" | |
25 | #include "parser-defs.h" | |
26 | #include "language.h" | |
27 | #include "value.h" | |
28 | #include "c-lang.h" | |
29 | #include "scm-lang.h" | |
30 | #include "scm-tags.h" | |
31 | #include "source.h" | |
32 | #include "gdb_string.h" | |
33 | #include "gdbcore.h" | |
34 | #include "infcall.h" | |
3e3b026f | 35 | #include "objfiles.h" |
d4310edb LC |
36 | |
37 | extern void _initialize_scheme_language (void); | |
6ceaaae5 | 38 | static struct value *scm_lookup_name (struct gdbarch *, char *); |
d4310edb LC |
39 | static int in_eval_c (void); |
40 | ||
d4310edb | 41 | void |
6c7a06a3 | 42 | scm_printchar (int c, struct type *type, struct ui_file *stream) |
d4310edb LC |
43 | { |
44 | fprintf_filtered (stream, "#\\%c", c); | |
45 | } | |
46 | ||
47 | static void | |
6c7a06a3 | 48 | scm_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string, |
be759fcf | 49 | unsigned int length, const char *encoding, int force_ellipses, |
79a45b7d | 50 | const struct value_print_options *options) |
d4310edb LC |
51 | { |
52 | fprintf_filtered (stream, "\"%s\"", string); | |
53 | } | |
54 | ||
55 | int | |
56 | is_scmvalue_type (struct type *type) | |
57 | { | |
58 | if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) | |
59 | { | |
60 | return 1; | |
61 | } | |
62 | return 0; | |
63 | } | |
64 | ||
65 | /* Get the INDEX'th SCM value, assuming SVALUE is the address | |
66 | of the 0'th one. */ | |
67 | ||
68 | LONGEST | |
e17a4113 UW |
69 | scm_get_field (LONGEST svalue, int index, int size, |
70 | enum bfd_endian byte_order) | |
d4310edb LC |
71 | { |
72 | gdb_byte buffer[20]; | |
433759f7 | 73 | |
6ceaaae5 | 74 | read_memory (SCM2PTR (svalue) + index * size, buffer, size); |
e17a4113 | 75 | return extract_signed_integer (buffer, size, byte_order); |
d4310edb LC |
76 | } |
77 | ||
78 | /* Unpack a value of type TYPE in buffer VALADDR as an integer | |
79 | (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), | |
80 | or Boolean (CONTEXT == TYPE_CODE_BOOL). */ | |
81 | ||
82 | LONGEST | |
83 | scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context) | |
84 | { | |
85 | if (is_scmvalue_type (type)) | |
86 | { | |
e17a4113 UW |
87 | enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type)); |
88 | LONGEST svalue | |
89 | = extract_signed_integer (valaddr, TYPE_LENGTH (type), byte_order); | |
90 | ||
d4310edb LC |
91 | if (context == TYPE_CODE_BOOL) |
92 | { | |
93 | if (svalue == SCM_BOOL_F) | |
94 | return 0; | |
95 | else | |
96 | return 1; | |
97 | } | |
98 | switch (7 & (int) svalue) | |
99 | { | |
100 | case 2: | |
101 | case 6: /* fixnum */ | |
102 | return svalue >> 2; | |
103 | case 4: /* other immediate value */ | |
104 | if (SCM_ICHRP (svalue)) /* character */ | |
105 | return SCM_ICHR (svalue); | |
106 | else if (SCM_IFLAGP (svalue)) | |
107 | { | |
108 | switch ((int) svalue) | |
109 | { | |
110 | #ifndef SICP | |
111 | case SCM_EOL: | |
112 | #endif | |
113 | case SCM_BOOL_F: | |
114 | return 0; | |
115 | case SCM_BOOL_T: | |
116 | return 1; | |
117 | } | |
118 | } | |
119 | error (_("Value can't be converted to integer.")); | |
120 | default: | |
121 | return svalue; | |
122 | } | |
123 | } | |
124 | else | |
125 | return unpack_long (type, valaddr); | |
126 | } | |
127 | ||
128 | /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ | |
129 | ||
130 | static int | |
131 | in_eval_c (void) | |
132 | { | |
133 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
134 | ||
135 | if (cursal.symtab && cursal.symtab->filename) | |
136 | { | |
137 | char *filename = cursal.symtab->filename; | |
138 | int len = strlen (filename); | |
433759f7 | 139 | |
d4310edb LC |
140 | if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) |
141 | return 1; | |
142 | } | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* Lookup a value for the variable named STR. | |
147 | First lookup in Scheme context (using the scm_lookup_cstr inferior | |
148 | function), then try lookup_symbol for compiled variables. */ | |
149 | ||
150 | static struct value * | |
6ceaaae5 | 151 | scm_lookup_name (struct gdbarch *gdbarch, char *str) |
d4310edb LC |
152 | { |
153 | struct value *args[3]; | |
154 | int len = strlen (str); | |
155 | struct value *func; | |
156 | struct value *val; | |
157 | struct symbol *sym; | |
3e3b026f | 158 | |
6ceaaae5 | 159 | func = find_function_in_inferior ("scm_lookup_cstr", NULL); |
3e3b026f | 160 | |
d4310edb | 161 | args[0] = value_allocate_space_in_inferior (len); |
3e3b026f | 162 | args[1] = value_from_longest (builtin_type (gdbarch)->builtin_int, len); |
d4310edb LC |
163 | write_memory (value_as_long (args[0]), (gdb_byte *) str, len); |
164 | ||
165 | if (in_eval_c () | |
166 | && (sym = lookup_symbol ("env", | |
167 | expression_context_block, | |
2570f2b7 | 168 | VAR_DOMAIN, (int *) NULL)) != NULL) |
d4310edb LC |
169 | args[2] = value_of_variable (sym, expression_context_block); |
170 | else | |
171 | /* FIXME in this case, we should try lookup_symbol first */ | |
6ceaaae5 UW |
172 | args[2] = value_from_longest (builtin_scm_type (gdbarch)->builtin_scm, |
173 | SCM_EOL); | |
d4310edb | 174 | |
d4310edb LC |
175 | val = call_function_by_hand (func, 3, args); |
176 | if (!value_logical_not (val)) | |
177 | return value_ind (val); | |
178 | ||
179 | sym = lookup_symbol (str, | |
180 | expression_context_block, | |
2570f2b7 | 181 | VAR_DOMAIN, (int *) NULL); |
d4310edb LC |
182 | if (sym) |
183 | return value_of_variable (sym, NULL); | |
184 | error (_("No symbol \"%s\" in current context."), str); | |
185 | } | |
186 | ||
187 | struct value * | |
188 | scm_evaluate_string (char *str, int len) | |
189 | { | |
190 | struct value *func; | |
191 | struct value *addr = value_allocate_space_in_inferior (len + 1); | |
192 | LONGEST iaddr = value_as_long (addr); | |
433759f7 | 193 | |
d4310edb LC |
194 | write_memory (iaddr, (gdb_byte *) str, len); |
195 | /* FIXME - should find and pass env */ | |
196 | write_memory (iaddr + len, (gdb_byte *) "", 1); | |
3e3b026f | 197 | func = find_function_in_inferior ("scm_evstr", NULL); |
d4310edb LC |
198 | return call_function_by_hand (func, 1, &addr); |
199 | } | |
200 | ||
201 | static struct value * | |
202 | evaluate_exp (struct type *expect_type, struct expression *exp, | |
203 | int *pos, enum noside noside) | |
204 | { | |
205 | enum exp_opcode op = exp->elts[*pos].opcode; | |
206 | int len, pc; | |
207 | char *str; | |
433759f7 | 208 | |
d4310edb LC |
209 | switch (op) |
210 | { | |
211 | case OP_NAME: | |
212 | pc = (*pos)++; | |
213 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
214 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
215 | if (noside == EVAL_SKIP) | |
216 | goto nosideret; | |
217 | str = &exp->elts[pc + 2].string; | |
6ceaaae5 | 218 | return scm_lookup_name (exp->gdbarch, str); |
d4310edb LC |
219 | case OP_STRING: |
220 | pc = (*pos)++; | |
221 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
222 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
223 | if (noside == EVAL_SKIP) | |
224 | goto nosideret; | |
225 | str = &exp->elts[pc + 2].string; | |
226 | return scm_evaluate_string (str, len); | |
227 | default:; | |
228 | } | |
229 | return evaluate_subexp_standard (expect_type, exp, pos, noside); | |
230 | nosideret: | |
22601c15 | 231 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); |
d4310edb LC |
232 | } |
233 | ||
234 | const struct exp_descriptor exp_descriptor_scm = | |
235 | { | |
236 | print_subexp_standard, | |
237 | operator_length_standard, | |
c0201579 | 238 | operator_check_standard, |
d4310edb LC |
239 | op_name_standard, |
240 | dump_subexp_body_standard, | |
241 | evaluate_exp | |
242 | }; | |
243 | ||
244 | const struct language_defn scm_language_defn = | |
245 | { | |
246 | "scheme", /* Language name */ | |
247 | language_scm, | |
d4310edb LC |
248 | range_check_off, |
249 | type_check_off, | |
250 | case_sensitive_off, | |
251 | array_row_major, | |
9a044a89 | 252 | macro_expansion_no, |
d4310edb LC |
253 | &exp_descriptor_scm, |
254 | scm_parse, | |
255 | c_error, | |
256 | null_post_parser, | |
257 | scm_printchar, /* Print a character constant */ | |
258 | scm_printstr, /* Function to print string constant */ | |
259 | NULL, /* Function to print a single character */ | |
d4310edb | 260 | c_print_type, /* Print a type using appropriate syntax */ |
5c6ce71d | 261 | default_print_typedef, /* Print a typedef using appropriate syntax */ |
d4310edb LC |
262 | scm_val_print, /* Print a value using appropriate syntax */ |
263 | scm_value_print, /* Print a top-level value */ | |
264 | NULL, /* Language specific skip_trampoline */ | |
2b2d9e11 | 265 | NULL, /* name_of_this */ |
d4310edb LC |
266 | basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ |
267 | basic_lookup_transparent_type,/* lookup_transparent_type */ | |
268 | NULL, /* Language specific symbol demangler */ | |
269 | NULL, /* Language specific class_name_from_physname */ | |
270 | NULL, /* expression operators for printing */ | |
271 | 1, /* c-style arrays */ | |
272 | 0, /* String lower bound */ | |
d4310edb | 273 | default_word_break_characters, |
41d27058 | 274 | default_make_symbol_completion_list, |
d4310edb LC |
275 | c_language_arch_info, |
276 | default_print_array_index, | |
41f1b697 | 277 | default_pass_by_reference, |
ae6a3a4c | 278 | default_get_string, |
d4310edb LC |
279 | LANG_MAGIC |
280 | }; | |
281 | ||
6ceaaae5 UW |
282 | static void * |
283 | build_scm_types (struct gdbarch *gdbarch) | |
284 | { | |
285 | struct builtin_scm_type *builtin_scm_type | |
286 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_scm_type); | |
287 | ||
e9bb382b UW |
288 | builtin_scm_type->builtin_scm |
289 | = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "SCM"); | |
6ceaaae5 UW |
290 | |
291 | return builtin_scm_type; | |
292 | } | |
293 | ||
294 | static struct gdbarch_data *scm_type_data; | |
295 | ||
296 | const struct builtin_scm_type * | |
297 | builtin_scm_type (struct gdbarch *gdbarch) | |
298 | { | |
299 | return gdbarch_data (gdbarch, scm_type_data); | |
300 | } | |
301 | ||
d4310edb LC |
302 | void |
303 | _initialize_scheme_language (void) | |
304 | { | |
6ceaaae5 UW |
305 | scm_type_data = gdbarch_data_register_post_init (build_scm_types); |
306 | ||
d4310edb | 307 | add_language (&scm_language_defn); |
d4310edb | 308 | } |