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d4310edb LC |
1 | /* Scheme/Guile language support routines for GDB, the GNU debugger. |
2 | ||
9b254dd1 DJ |
3 | Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007, |
4 | 2008 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); | |
38 | static struct value *evaluate_subexp_scm (struct type *, struct expression *, | |
39 | int *, enum noside); | |
40 | static struct value *scm_lookup_name (char *); | |
41 | static int in_eval_c (void); | |
42 | ||
43 | struct type *builtin_type_scm; | |
44 | ||
45 | void | |
46 | scm_printchar (int c, struct ui_file *stream) | |
47 | { | |
48 | fprintf_filtered (stream, "#\\%c", c); | |
49 | } | |
50 | ||
51 | static void | |
52 | scm_printstr (struct ui_file *stream, const gdb_byte *string, | |
53 | unsigned int length, int width, int force_ellipses) | |
54 | { | |
55 | fprintf_filtered (stream, "\"%s\"", string); | |
56 | } | |
57 | ||
58 | int | |
59 | is_scmvalue_type (struct type *type) | |
60 | { | |
61 | if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) | |
62 | { | |
63 | return 1; | |
64 | } | |
65 | return 0; | |
66 | } | |
67 | ||
68 | /* Get the INDEX'th SCM value, assuming SVALUE is the address | |
69 | of the 0'th one. */ | |
70 | ||
71 | LONGEST | |
72 | scm_get_field (LONGEST svalue, int index) | |
73 | { | |
74 | gdb_byte buffer[20]; | |
75 | read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm), | |
76 | buffer, TYPE_LENGTH (builtin_type_scm)); | |
77 | return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm)); | |
78 | } | |
79 | ||
80 | /* Unpack a value of type TYPE in buffer VALADDR as an integer | |
81 | (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), | |
82 | or Boolean (CONTEXT == TYPE_CODE_BOOL). */ | |
83 | ||
84 | LONGEST | |
85 | scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context) | |
86 | { | |
87 | if (is_scmvalue_type (type)) | |
88 | { | |
89 | LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type)); | |
90 | if (context == TYPE_CODE_BOOL) | |
91 | { | |
92 | if (svalue == SCM_BOOL_F) | |
93 | return 0; | |
94 | else | |
95 | return 1; | |
96 | } | |
97 | switch (7 & (int) svalue) | |
98 | { | |
99 | case 2: | |
100 | case 6: /* fixnum */ | |
101 | return svalue >> 2; | |
102 | case 4: /* other immediate value */ | |
103 | if (SCM_ICHRP (svalue)) /* character */ | |
104 | return SCM_ICHR (svalue); | |
105 | else if (SCM_IFLAGP (svalue)) | |
106 | { | |
107 | switch ((int) svalue) | |
108 | { | |
109 | #ifndef SICP | |
110 | case SCM_EOL: | |
111 | #endif | |
112 | case SCM_BOOL_F: | |
113 | return 0; | |
114 | case SCM_BOOL_T: | |
115 | return 1; | |
116 | } | |
117 | } | |
118 | error (_("Value can't be converted to integer.")); | |
119 | default: | |
120 | return svalue; | |
121 | } | |
122 | } | |
123 | else | |
124 | return unpack_long (type, valaddr); | |
125 | } | |
126 | ||
127 | /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ | |
128 | ||
129 | static int | |
130 | in_eval_c (void) | |
131 | { | |
132 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
133 | ||
134 | if (cursal.symtab && cursal.symtab->filename) | |
135 | { | |
136 | char *filename = cursal.symtab->filename; | |
137 | int len = strlen (filename); | |
138 | if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) | |
139 | return 1; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
144 | /* Lookup a value for the variable named STR. | |
145 | First lookup in Scheme context (using the scm_lookup_cstr inferior | |
146 | function), then try lookup_symbol for compiled variables. */ | |
147 | ||
148 | static struct value * | |
149 | scm_lookup_name (char *str) | |
150 | { | |
3e3b026f UW |
151 | struct objfile *objf; |
152 | struct gdbarch *gdbarch; | |
d4310edb LC |
153 | struct value *args[3]; |
154 | int len = strlen (str); | |
155 | struct value *func; | |
156 | struct value *val; | |
157 | struct symbol *sym; | |
3e3b026f UW |
158 | |
159 | func = find_function_in_inferior ("scm_lookup_cstr", &objf); | |
160 | gdbarch = get_objfile_arch (objf); | |
161 | ||
d4310edb | 162 | args[0] = value_allocate_space_in_inferior (len); |
3e3b026f | 163 | args[1] = value_from_longest (builtin_type (gdbarch)->builtin_int, len); |
d4310edb LC |
164 | write_memory (value_as_long (args[0]), (gdb_byte *) str, len); |
165 | ||
166 | if (in_eval_c () | |
167 | && (sym = lookup_symbol ("env", | |
168 | expression_context_block, | |
2570f2b7 | 169 | VAR_DOMAIN, (int *) NULL)) != NULL) |
d4310edb LC |
170 | args[2] = value_of_variable (sym, expression_context_block); |
171 | else | |
172 | /* FIXME in this case, we should try lookup_symbol first */ | |
173 | args[2] = value_from_longest (builtin_type_scm, SCM_EOL); | |
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); | |
193 | write_memory (iaddr, (gdb_byte *) str, len); | |
194 | /* FIXME - should find and pass env */ | |
195 | write_memory (iaddr + len, (gdb_byte *) "", 1); | |
3e3b026f | 196 | func = find_function_in_inferior ("scm_evstr", NULL); |
d4310edb LC |
197 | return call_function_by_hand (func, 1, &addr); |
198 | } | |
199 | ||
200 | static struct value * | |
201 | evaluate_exp (struct type *expect_type, struct expression *exp, | |
202 | int *pos, enum noside noside) | |
203 | { | |
204 | enum exp_opcode op = exp->elts[*pos].opcode; | |
205 | int len, pc; | |
206 | char *str; | |
207 | switch (op) | |
208 | { | |
209 | case OP_NAME: | |
210 | pc = (*pos)++; | |
211 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
212 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
213 | if (noside == EVAL_SKIP) | |
214 | goto nosideret; | |
215 | str = &exp->elts[pc + 2].string; | |
216 | return scm_lookup_name (str); | |
217 | case OP_STRING: | |
218 | pc = (*pos)++; | |
219 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
220 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
221 | if (noside == EVAL_SKIP) | |
222 | goto nosideret; | |
223 | str = &exp->elts[pc + 2].string; | |
224 | return scm_evaluate_string (str, len); | |
225 | default:; | |
226 | } | |
227 | return evaluate_subexp_standard (expect_type, exp, pos, noside); | |
228 | nosideret: | |
cb18ec49 | 229 | return value_from_longest (builtin_type_int8, (LONGEST) 1); |
d4310edb LC |
230 | } |
231 | ||
232 | const struct exp_descriptor exp_descriptor_scm = | |
233 | { | |
234 | print_subexp_standard, | |
235 | operator_length_standard, | |
236 | op_name_standard, | |
237 | dump_subexp_body_standard, | |
238 | evaluate_exp | |
239 | }; | |
240 | ||
241 | const struct language_defn scm_language_defn = | |
242 | { | |
243 | "scheme", /* Language name */ | |
244 | language_scm, | |
d4310edb LC |
245 | range_check_off, |
246 | type_check_off, | |
247 | case_sensitive_off, | |
248 | array_row_major, | |
249 | &exp_descriptor_scm, | |
250 | scm_parse, | |
251 | c_error, | |
252 | null_post_parser, | |
253 | scm_printchar, /* Print a character constant */ | |
254 | scm_printstr, /* Function to print string constant */ | |
255 | NULL, /* Function to print a single character */ | |
d4310edb LC |
256 | c_print_type, /* Print a type using appropriate syntax */ |
257 | scm_val_print, /* Print a value using appropriate syntax */ | |
258 | scm_value_print, /* Print a top-level value */ | |
259 | NULL, /* Language specific skip_trampoline */ | |
2b2d9e11 | 260 | NULL, /* name_of_this */ |
d4310edb LC |
261 | basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ |
262 | basic_lookup_transparent_type,/* lookup_transparent_type */ | |
263 | NULL, /* Language specific symbol demangler */ | |
264 | NULL, /* Language specific class_name_from_physname */ | |
265 | NULL, /* expression operators for printing */ | |
266 | 1, /* c-style arrays */ | |
267 | 0, /* String lower bound */ | |
d4310edb | 268 | default_word_break_characters, |
41d27058 | 269 | default_make_symbol_completion_list, |
d4310edb LC |
270 | c_language_arch_info, |
271 | default_print_array_index, | |
41f1b697 | 272 | default_pass_by_reference, |
d4310edb LC |
273 | LANG_MAGIC |
274 | }; | |
275 | ||
276 | void | |
277 | _initialize_scheme_language (void) | |
278 | { | |
279 | add_language (&scm_language_defn); | |
280 | builtin_type_scm = | |
281 | init_type (TYPE_CODE_INT, | |
282 | gdbarch_long_bit (current_gdbarch) / TARGET_CHAR_BIT, | |
283 | 0, "SCM", (struct objfile *) NULL); | |
284 | } |