1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
2 Copyright 1995, 1996, 1998, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
25 #include "expression.h"
26 #include "parser-defs.h"
33 #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);
41 static void scm_printstr (struct ui_file * stream, char *string,
42 unsigned int length, int width,
45 extern struct type **const (c_builtin_types[]);
47 struct type *builtin_type_scm;
50 scm_printchar (int c, struct ui_file *stream)
52 fprintf_filtered (stream, "#\\%c", c);
56 scm_printstr (struct ui_file *stream, char *string, unsigned int length,
57 int width, int force_ellipses)
59 fprintf_filtered (stream, "\"%s\"", string);
63 is_scmvalue_type (struct type *type)
65 if (TYPE_CODE (type) == TYPE_CODE_INT
66 && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
73 /* Get the INDEX'th SCM value, assuming SVALUE is the address
77 scm_get_field (LONGEST svalue, int index)
80 read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
81 buffer, TYPE_LENGTH (builtin_type_scm));
82 return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
85 /* Unpack a value of type TYPE in buffer VALADDR as an integer
86 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
87 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
90 scm_unpack (struct type *type, char *valaddr, enum type_code context)
92 if (is_scmvalue_type (type))
94 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
95 if (context == TYPE_CODE_BOOL)
97 if (svalue == SCM_BOOL_F)
102 switch (7 & (int) svalue)
107 case 4: /* other immediate value */
108 if (SCM_ICHRP (svalue)) /* character */
109 return SCM_ICHR (svalue);
110 else if (SCM_IFLAGP (svalue))
112 switch ((int) svalue)
123 error ("Value can't be converted to integer.");
129 return unpack_long (type, valaddr);
132 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
137 struct symtab_and_line cursal =
138 get_current_or_default_source_symtab_and_line ();
140 if (cursal.symtab && cursal.symtab->filename)
142 char *filename = cursal.symtab->filename;
143 int len = strlen (filename);
144 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
150 /* Lookup a value for the variable named STR.
151 First lookup in Scheme context (using the scm_lookup_cstr inferior
152 function), then try lookup_symbol for compiled variables. */
154 static struct value *
155 scm_lookup_name (char *str)
157 struct value *args[3];
158 int len = strlen (str);
162 args[0] = value_allocate_space_in_inferior (len);
163 args[1] = value_from_longest (builtin_type_int, len);
164 write_memory (value_as_long (args[0]), str, len);
167 && (sym = lookup_symbol ("env",
168 expression_context_block,
169 VAR_NAMESPACE, (int *) NULL,
170 (struct symtab **) NULL)) != NULL)
171 args[2] = value_of_variable (sym, expression_context_block);
173 /* FIXME in this case, we should try lookup_symbol first */
174 args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
176 func = find_function_in_inferior ("scm_lookup_cstr");
177 val = call_function_by_hand (func, 3, args);
178 if (!value_logical_not (val))
179 return value_ind (val);
181 sym = lookup_symbol (str,
182 expression_context_block,
183 VAR_NAMESPACE, (int *) NULL,
184 (struct symtab **) NULL);
186 return value_of_variable (sym, NULL);
187 error ("No symbol \"%s\" in current context.", str);
191 scm_evaluate_string (char *str, int len)
194 struct value *addr = value_allocate_space_in_inferior (len + 1);
195 LONGEST iaddr = value_as_long (addr);
196 write_memory (iaddr, str, len);
197 /* FIXME - should find and pass env */
198 write_memory (iaddr + len, "", 1);
199 func = find_function_in_inferior ("scm_evstr");
200 return call_function_by_hand (func, 1, &addr);
203 static struct value *
204 evaluate_subexp_scm (struct type *expect_type, register struct expression *exp,
205 register int *pos, enum noside noside)
207 enum exp_opcode op = exp->elts[*pos].opcode;
214 len = longest_to_int (exp->elts[pc + 1].longconst);
215 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
216 if (noside == EVAL_SKIP)
218 str = &exp->elts[pc + 2].string;
219 return scm_lookup_name (str);
222 len = longest_to_int (exp->elts[pc + 1].longconst);
223 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
224 if (noside == EVAL_SKIP)
226 str = &exp->elts[pc + 2].string;
227 return scm_evaluate_string (str, len);
230 return evaluate_subexp_standard (expect_type, exp, pos, noside);
232 return value_from_longest (builtin_type_long, (LONGEST) 1);
235 const struct language_defn scm_language_defn =
237 "scheme", /* Language name */
246 scm_printchar, /* Print a character constant */
247 scm_printstr, /* Function to print string constant */
248 NULL, /* Function to print a single character */
249 NULL, /* Create fundamental type in this language */
250 c_print_type, /* Print a type using appropriate syntax */
251 scm_val_print, /* Print a value using appropriate syntax */
252 scm_value_print, /* Print a top-level value */
253 {"", "", "", ""}, /* Binary format info */
254 {"#o%lo", "#o", "o", ""}, /* Octal format info */
255 {"%ld", "", "d", ""}, /* Decimal format info */
256 {"#x%lX", "#X", "X", ""}, /* Hex format info */
257 NULL, /* expression operators for printing */
258 1, /* c-style arrays */
259 0, /* String lower bound */
260 &builtin_type_char, /* Type of string elements */
265 _initialize_scheme_language (void)
267 add_language (&scm_language_defn);
268 builtin_type_scm = init_type (TYPE_CODE_INT,
269 TARGET_LONG_BIT / TARGET_CHAR_BIT,
270 0, "SCM", (struct objfile *) NULL);