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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,
19 Boston, MA 02111-1307, USA. */
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 "gdb_string.h"
32 #include "gdbcore.h"
33
34 extern void _initialize_scheme_language PARAMS ((void));
35 static value_ptr evaluate_subexp_scm PARAMS ((struct type *, struct expression *,
36 int *, enum noside));
37 static value_ptr scm_lookup_name PARAMS ((char *));
38 static int in_eval_c PARAMS ((void));
39 static void scm_printstr PARAMS ((GDB_FILE * stream, char *string, unsigned int length, int width, int force_ellipses));
40
41 extern struct type **CONST_PTR (c_builtin_types[]);
42
43 struct type *builtin_type_scm;
44
45 void
46 scm_printchar (c, stream)
47 int c;
48 GDB_FILE *stream;
49 {
50 fprintf_filtered (stream, "#\\%c", c);
51 }
52
53 static void
54 scm_printstr (stream, string, length, width, force_ellipses)
55 GDB_FILE *stream;
56 char *string;
57 unsigned int length;
58 int width;
59 int force_ellipses;
60 {
61 fprintf_filtered (stream, "\"%s\"", string);
62 }
63
64 int
65 is_scmvalue_type (type)
66 struct type *type;
67 {
68 if (TYPE_CODE (type) == TYPE_CODE_INT
69 && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
70 {
71 return 1;
72 }
73 return 0;
74 }
75
76 /* Get the INDEX'th SCM value, assuming SVALUE is the address
77 of the 0'th one. */
78
79 LONGEST
80 scm_get_field (svalue, index)
81 LONGEST svalue;
82 int index;
83 {
84 char buffer[20];
85 read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
86 buffer, TYPE_LENGTH (builtin_type_scm));
87 return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
88 }
89
90 /* Unpack a value of type TYPE in buffer VALADDR as an integer
91 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
92 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
93
94 LONGEST
95 scm_unpack (type, valaddr, context)
96 struct type *type;
97 char *valaddr;
98 enum type_code context;
99 {
100 if (is_scmvalue_type (type))
101 {
102 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
103 if (context == TYPE_CODE_BOOL)
104 {
105 if (svalue == SCM_BOOL_F)
106 return 0;
107 else
108 return 1;
109 }
110 switch (7 & (int) svalue)
111 {
112 case 2:
113 case 6: /* fixnum */
114 return svalue >> 2;
115 case 4: /* other immediate value */
116 if (SCM_ICHRP (svalue)) /* character */
117 return SCM_ICHR (svalue);
118 else if (SCM_IFLAGP (svalue))
119 {
120 switch ((int) svalue)
121 {
122 #ifndef SICP
123 case SCM_EOL:
124 #endif
125 case SCM_BOOL_F:
126 return 0;
127 case SCM_BOOL_T:
128 return 1;
129 }
130 }
131 error ("Value can't be converted to integer.");
132 default:
133 return svalue;
134 }
135 }
136 else
137 return unpack_long (type, valaddr);
138 }
139
140 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
141
142 static int
143 in_eval_c ()
144 {
145 if (current_source_symtab && current_source_symtab->filename)
146 {
147 char *filename = current_source_symtab->filename;
148 int len = strlen (filename);
149 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
150 return 1;
151 }
152 return 0;
153 }
154
155 /* Lookup a value for the variable named STR.
156 First lookup in Scheme context (using the scm_lookup_cstr inferior
157 function), then try lookup_symbol for compiled variables. */
158
159 static value_ptr
160 scm_lookup_name (str)
161 char *str;
162 {
163 value_ptr args[3];
164 int len = strlen (str);
165 value_ptr func, val;
166 struct symbol *sym;
167 args[0] = value_allocate_space_in_inferior (len);
168 args[1] = value_from_longest (builtin_type_int, len);
169 write_memory (value_as_long (args[0]), str, len);
170
171 if (in_eval_c ()
172 && (sym = lookup_symbol ("env",
173 expression_context_block,
174 VAR_NAMESPACE, (int *) NULL,
175 (struct symtab **) NULL)) != NULL)
176 args[2] = value_of_variable (sym, expression_context_block);
177 else
178 /* FIXME in this case, we should try lookup_symbol first */
179 args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
180
181 func = find_function_in_inferior ("scm_lookup_cstr");
182 val = call_function_by_hand (func, 3, args);
183 if (!value_logical_not (val))
184 return value_ind (val);
185
186 sym = lookup_symbol (str,
187 expression_context_block,
188 VAR_NAMESPACE, (int *) NULL,
189 (struct symtab **) NULL);
190 if (sym)
191 return value_of_variable (sym, NULL);
192 error ("No symbol \"%s\" in current context.");
193 }
194
195 value_ptr
196 scm_evaluate_string (str, len)
197 char *str;
198 int len;
199 {
200 value_ptr func;
201 value_ptr addr = value_allocate_space_in_inferior (len + 1);
202 LONGEST iaddr = value_as_long (addr);
203 write_memory (iaddr, str, len);
204 /* FIXME - should find and pass env */
205 write_memory (iaddr + len, "", 1);
206 func = find_function_in_inferior ("scm_evstr");
207 return call_function_by_hand (func, 1, &addr);
208 }
209
210 static value_ptr
211 evaluate_subexp_scm (expect_type, exp, pos, noside)
212 struct type *expect_type;
213 register struct expression *exp;
214 register int *pos;
215 enum noside noside;
216 {
217 enum exp_opcode op = exp->elts[*pos].opcode;
218 int len, pc;
219 char *str;
220 switch (op)
221 {
222 case OP_NAME:
223 pc = (*pos)++;
224 len = longest_to_int (exp->elts[pc + 1].longconst);
225 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
226 if (noside == EVAL_SKIP)
227 goto nosideret;
228 str = &exp->elts[pc + 2].string;
229 return scm_lookup_name (str);
230 case OP_EXPRSTRING:
231 pc = (*pos)++;
232 len = longest_to_int (exp->elts[pc + 1].longconst);
233 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
234 if (noside == EVAL_SKIP)
235 goto nosideret;
236 str = &exp->elts[pc + 2].string;
237 return scm_evaluate_string (str, len);
238 default:;
239 }
240 return evaluate_subexp_standard (expect_type, exp, pos, noside);
241 nosideret:
242 return value_from_longest (builtin_type_long, (LONGEST) 1);
243 }
244
245 const struct language_defn scm_language_defn =
246 {
247 "scheme", /* Language name */
248 language_scm,
249 c_builtin_types,
250 range_check_off,
251 type_check_off,
252 scm_parse,
253 c_error,
254 evaluate_subexp_scm,
255 scm_printchar, /* Print a character constant */
256 scm_printstr, /* Function to print string constant */
257 NULL, /* Function to print a single character */
258 NULL, /* Create fundamental type in this language */
259 c_print_type, /* Print a type using appropriate syntax */
260 scm_val_print, /* Print a value using appropriate syntax */
261 scm_value_print, /* Print a top-level value */
262 {"", "", "", ""}, /* Binary format info */
263 {"#o%lo", "#o", "o", ""}, /* Octal format info */
264 {"%ld", "", "d", ""}, /* Decimal format info */
265 {"#x%lX", "#X", "X", ""}, /* Hex format info */
266 NULL, /* expression operators for printing */
267 1, /* c-style arrays */
268 0, /* String lower bound */
269 &builtin_type_char, /* Type of string elements */
270 LANG_MAGIC
271 };
272
273 void
274 _initialize_scheme_language ()
275 {
276 add_language (&scm_language_defn);
277 builtin_type_scm = init_type (TYPE_CODE_INT,
278 TARGET_LONG_BIT / TARGET_CHAR_BIT,
279 0, "SCM", (struct objfile *) NULL);
280 }