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0e4ca328 PB |
1 | /* Scheme/Guile language support routines for GDB, the GNU debugger. |
2 | Copyright 1995 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "symtab.h" | |
22 | #include "gdbtypes.h" | |
23 | #include "expression.h" | |
24 | #include "parser-defs.h" | |
25 | #include "language.h" | |
0e4ca328 | 26 | #include "value.h" |
5b4d668a PB |
27 | #include "c-lang.h" |
28 | #include "scm-lang.h" | |
29 | #include "scm-tags.h" | |
5579919f | 30 | #include "gdb_string.h" |
0e4ca328 PB |
31 | |
32 | extern struct type ** const (c_builtin_types[]); | |
33 | extern value_ptr value_allocate_space_in_inferior PARAMS ((int)); | |
34 | extern value_ptr find_function_in_inferior PARAMS ((char*)); | |
35 | ||
3c02944a | 36 | struct type *builtin_type_scm; |
0e4ca328 | 37 | |
5b4d668a | 38 | void |
0e4ca328 PB |
39 | scm_printchar (c, stream) |
40 | int c; | |
41 | GDB_FILE *stream; | |
42 | { | |
43 | fprintf_filtered (stream, "#\\%c", c); | |
44 | } | |
45 | ||
46 | static void | |
47 | scm_printstr (stream, string, length, force_ellipses) | |
48 | GDB_FILE *stream; | |
49 | char *string; | |
50 | unsigned int length; | |
51 | int force_ellipses; | |
52 | { | |
53 | fprintf_filtered (stream, "\"%s\"", string); | |
54 | } | |
55 | ||
56 | int | |
5b4d668a | 57 | is_scmvalue_type (type) |
0e4ca328 | 58 | struct type *type; |
0e4ca328 | 59 | { |
5b4d668a PB |
60 | if (TYPE_CODE (type) == TYPE_CODE_INT |
61 | && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) | |
0e4ca328 | 62 | { |
5b4d668a | 63 | return 1; |
0e4ca328 | 64 | } |
5b4d668a | 65 | return 0; |
0e4ca328 PB |
66 | } |
67 | ||
5b4d668a PB |
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 (svalue, index) | |
73 | LONGEST svalue; | |
74 | int index; | |
0e4ca328 | 75 | { |
5b4d668a PB |
76 | value_ptr val; |
77 | char buffer[20]; | |
3c02944a PB |
78 | read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm), |
79 | buffer, TYPE_LENGTH (builtin_type_scm)); | |
80 | return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm)); | |
81 | } | |
82 | ||
83 | /* Unpack a value of type TYPE in buffer VALADDR as an integer | |
84 | (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), | |
85 | or Boolean (CONTEXT == TYPE_CODE_BOOL). */ | |
86 | ||
87 | LONGEST | |
88 | scm_unpack (type, valaddr, context) | |
89 | struct type *type; | |
90 | char *valaddr; | |
91 | enum type_code context; | |
92 | { | |
93 | if (is_scmvalue_type (type)) | |
94 | { | |
95 | LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type)); | |
96 | if (context == TYPE_CODE_BOOL) | |
97 | { | |
98 | if (svalue == SCM_BOOL_F) | |
99 | return 0; | |
100 | else | |
101 | return 1; | |
102 | } | |
103 | switch (7 & svalue) | |
104 | { | |
105 | case 2: case 6: /* fixnum */ | |
106 | return svalue >> 2; | |
107 | case 4: /* other immediate value */ | |
108 | if (SCM_ICHRP (svalue)) /* character */ | |
109 | return SCM_ICHR (svalue); | |
110 | else if (SCM_IFLAGP (svalue)) | |
111 | { | |
112 | switch (svalue) | |
113 | { | |
114 | #ifndef SICP | |
115 | case SCM_EOL: | |
116 | #endif | |
117 | case SCM_BOOL_F: | |
118 | return 0; | |
119 | case SCM_BOOL_T: | |
120 | return 1; | |
121 | } | |
122 | } | |
123 | error ("Value can't be converted to integer."); | |
124 | default: | |
125 | return svalue; | |
126 | } | |
127 | } | |
128 | else | |
129 | return unpack_long (type, valaddr); | |
130 | } | |
131 | ||
132 | /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ | |
133 | ||
134 | static int | |
135 | in_eval_c () | |
136 | { | |
137 | if (current_source_symtab && current_source_symtab->filename) | |
138 | { | |
139 | char *filename = current_source_symtab->filename; | |
140 | int len = strlen (filename); | |
141 | if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) | |
142 | return 1; | |
143 | } | |
144 | return 0; | |
145 | } | |
146 | ||
147 | /* Lookup a value for the variable named STR. | |
148 | First lookup in Scheme context (using the scm_lookup_cstr inferior | |
149 | function), then try lookup_symbol for compiled variables. */ | |
150 | ||
151 | value_ptr | |
152 | scm_lookup_name (str) | |
153 | char *str; | |
154 | { | |
155 | value_ptr args[3]; | |
156 | int len = strlen (str); | |
157 | value_ptr symval, func, val; | |
158 | struct symbol *sym; | |
159 | args[0] = value_allocate_space_in_inferior (len); | |
160 | args[1] = value_from_longest (builtin_type_int, len); | |
161 | write_memory (value_as_long (args[0]), str, len); | |
162 | ||
163 | if (in_eval_c () | |
164 | && (sym = lookup_symbol ("env", | |
165 | expression_context_block, | |
166 | VAR_NAMESPACE, (int *) NULL, | |
167 | (struct symtab **) NULL)) != NULL) | |
168 | args[2] = value_of_variable (sym, expression_context_block); | |
169 | else | |
170 | /* FIXME in this case, we should try lookup_symbol first */ | |
171 | args[2] = value_from_longest (builtin_type_scm, SCM_EOL); | |
172 | ||
173 | func = find_function_in_inferior ("scm_lookup_cstr"); | |
174 | val = call_function_by_hand (func, 3, args); | |
175 | if (!value_logical_not (val)) | |
176 | return value_ind (val); | |
177 | ||
178 | sym = lookup_symbol (str, | |
179 | expression_context_block, | |
180 | VAR_NAMESPACE, (int *) NULL, | |
181 | (struct symtab **) NULL); | |
182 | if (sym) | |
183 | return value_of_variable (sym, NULL); | |
184 | error ("No symbol \"%s\" in current context."); | |
185 | } | |
186 | ||
187 | value_ptr | |
188 | scm_evaluate_string (str, len) | |
189 | char *str; int len; | |
190 | { | |
191 | value_ptr func; | |
192 | value_ptr addr = value_allocate_space_in_inferior (len + 1); | |
193 | LONGEST iaddr = value_as_long (addr); | |
194 | write_memory (iaddr, str, len); | |
195 | /* FIXME - should find and pass env */ | |
196 | write_memory (iaddr + len, "", 1); | |
197 | func = find_function_in_inferior ("scm_evstr"); | |
198 | return call_function_by_hand (func, 1, &addr); | |
0e4ca328 PB |
199 | } |
200 | ||
201 | static value_ptr | |
202 | evaluate_subexp_scm (expect_type, exp, pos, noside) | |
203 | struct type *expect_type; | |
204 | register struct expression *exp; | |
205 | register int *pos; | |
206 | enum noside noside; | |
207 | { | |
208 | enum exp_opcode op = exp->elts[*pos].opcode; | |
0e4ca328 PB |
209 | int len, pc; char *str; |
210 | switch (op) | |
211 | { | |
3c02944a PB |
212 | case OP_NAME: |
213 | pc = (*pos)++; | |
214 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
215 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
216 | if (noside == EVAL_SKIP) | |
217 | goto nosideret; | |
218 | str = &exp->elts[pc + 2].string; | |
219 | return scm_lookup_name (str); | |
0e4ca328 PB |
220 | case OP_EXPRSTRING: |
221 | pc = (*pos)++; | |
222 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
223 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
224 | if (noside == EVAL_SKIP) | |
225 | goto nosideret; | |
3c02944a PB |
226 | str = &exp->elts[pc + 2].string; |
227 | return scm_evaluate_string (str, len); | |
0e4ca328 PB |
228 | default: ; |
229 | } | |
230 | return evaluate_subexp_standard (expect_type, exp, pos, noside); | |
231 | nosideret: | |
232 | return value_from_longest (builtin_type_long, (LONGEST) 1); | |
233 | } | |
234 | ||
235 | const struct language_defn scm_language_defn = { | |
236 | "scheme", /* Language name */ | |
237 | language_scm, | |
238 | c_builtin_types, | |
239 | range_check_off, | |
240 | type_check_off, | |
241 | scm_parse, | |
242 | c_error, | |
243 | evaluate_subexp_scm, | |
244 | scm_printchar, /* Print a character constant */ | |
245 | scm_printstr, /* Function to print string constant */ | |
246 | NULL, /* Create fundamental type in this language */ | |
247 | c_print_type, /* Print a type using appropriate syntax */ | |
248 | scm_val_print, /* Print a value using appropriate syntax */ | |
249 | scm_value_print, /* Print a top-level value */ | |
250 | {"", "", "", ""}, /* Binary format info */ | |
251 | {"#o%lo", "#o", "o", ""}, /* Octal format info */ | |
252 | {"%ld", "", "d", ""}, /* Decimal format info */ | |
253 | {"#x%lX", "#X", "X", ""}, /* Hex format info */ | |
254 | NULL, /* expression operators for printing */ | |
255 | 1, /* c-style arrays */ | |
256 | 0, /* String lower bound */ | |
257 | &builtin_type_char, /* Type of string elements */ | |
258 | LANG_MAGIC | |
259 | }; | |
260 | ||
261 | void | |
262 | _initialize_scheme_language () | |
263 | { | |
264 | add_language (&scm_language_defn); | |
3c02944a PB |
265 | builtin_type_scm = init_type (TYPE_CODE_INT, |
266 | TARGET_LONG_BIT / TARGET_CHAR_BIT, | |
267 | 0, "SCM", (struct objfile *) NULL); | |
0e4ca328 | 268 | } |