1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
2 Copyright 1995, 2000 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
24 #include "expression.h"
25 #include "parser-defs.h"
31 #include "gdb_string.h"
34 extern void _initialize_scheme_language (void);
35 static value_ptr evaluate_subexp_scm (struct type *, struct expression *,
37 static value_ptr scm_lookup_name (char *);
38 static int in_eval_c (void);
39 static void scm_printstr (struct ui_file * stream, char *string,
40 unsigned int length, int width,
43 extern struct type **CONST_PTR (c_builtin_types[]);
45 struct type *builtin_type_scm;
48 scm_printchar (int c, struct ui_file *stream)
50 fprintf_filtered (stream, "#\\%c", c);
54 scm_printstr (struct ui_file *stream, char *string, unsigned int length,
55 int width, int force_ellipses)
57 fprintf_filtered (stream, "\"%s\"", string);
61 is_scmvalue_type (struct type *type)
63 if (TYPE_CODE (type) == TYPE_CODE_INT
64 && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
71 /* Get the INDEX'th SCM value, assuming SVALUE is the address
75 scm_get_field (LONGEST svalue, int index)
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));
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). */
88 scm_unpack (struct type *type, char *valaddr, enum type_code context)
90 if (is_scmvalue_type (type))
92 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
93 if (context == TYPE_CODE_BOOL)
95 if (svalue == SCM_BOOL_F)
100 switch (7 & (int) svalue)
105 case 4: /* other immediate value */
106 if (SCM_ICHRP (svalue)) /* character */
107 return SCM_ICHR (svalue);
108 else if (SCM_IFLAGP (svalue))
110 switch ((int) svalue)
121 error ("Value can't be converted to integer.");
127 return unpack_long (type, valaddr);
130 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
135 if (current_source_symtab && current_source_symtab->filename)
137 char *filename = current_source_symtab->filename;
138 int len = strlen (filename);
139 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
145 /* Lookup a value for the variable named STR.
146 First lookup in Scheme context (using the scm_lookup_cstr inferior
147 function), then try lookup_symbol for compiled variables. */
150 scm_lookup_name (char *str)
153 int len = strlen (str);
156 args[0] = value_allocate_space_in_inferior (len);
157 args[1] = value_from_longest (builtin_type_int, len);
158 write_memory (value_as_long (args[0]), str, len);
161 && (sym = lookup_symbol ("env",
162 expression_context_block,
163 VAR_NAMESPACE, (int *) NULL,
164 (struct symtab **) NULL)) != NULL)
165 args[2] = value_of_variable (sym, expression_context_block);
167 /* FIXME in this case, we should try lookup_symbol first */
168 args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
170 func = find_function_in_inferior ("scm_lookup_cstr");
171 val = call_function_by_hand (func, 3, args);
172 if (!value_logical_not (val))
173 return value_ind (val);
175 sym = lookup_symbol (str,
176 expression_context_block,
177 VAR_NAMESPACE, (int *) NULL,
178 (struct symtab **) NULL);
180 return value_of_variable (sym, NULL);
181 error ("No symbol \"%s\" in current context.");
185 scm_evaluate_string (char *str, int len)
188 value_ptr addr = value_allocate_space_in_inferior (len + 1);
189 LONGEST iaddr = value_as_long (addr);
190 write_memory (iaddr, str, len);
191 /* FIXME - should find and pass env */
192 write_memory (iaddr + len, "", 1);
193 func = find_function_in_inferior ("scm_evstr");
194 return call_function_by_hand (func, 1, &addr);
198 evaluate_subexp_scm (struct type *expect_type, register struct expression *exp,
199 register int *pos, enum noside noside)
201 enum exp_opcode op = exp->elts[*pos].opcode;
208 len = longest_to_int (exp->elts[pc + 1].longconst);
209 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
210 if (noside == EVAL_SKIP)
212 str = &exp->elts[pc + 2].string;
213 return scm_lookup_name (str);
216 len = longest_to_int (exp->elts[pc + 1].longconst);
217 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
218 if (noside == EVAL_SKIP)
220 str = &exp->elts[pc + 2].string;
221 return scm_evaluate_string (str, len);
224 return evaluate_subexp_standard (expect_type, exp, pos, noside);
226 return value_from_longest (builtin_type_long, (LONGEST) 1);
229 const struct language_defn scm_language_defn =
231 "scheme", /* Language name */
239 scm_printchar, /* Print a character constant */
240 scm_printstr, /* Function to print string constant */
241 NULL, /* Function to print a single character */
242 NULL, /* Create fundamental type in this language */
243 c_print_type, /* Print a type using appropriate syntax */
244 scm_val_print, /* Print a value using appropriate syntax */
245 scm_value_print, /* Print a top-level value */
246 {"", "", "", ""}, /* Binary format info */
247 {"#o%lo", "#o", "o", ""}, /* Octal format info */
248 {"%ld", "", "d", ""}, /* Decimal format info */
249 {"#x%lX", "#X", "X", ""}, /* Hex format info */
250 NULL, /* expression operators for printing */
251 1, /* c-style arrays */
252 0, /* String lower bound */
253 &builtin_type_char, /* Type of string elements */
258 _initialize_scheme_language (void)
260 add_language (&scm_language_defn);
261 builtin_type_scm = init_type (TYPE_CODE_INT,
262 TARGET_LONG_BIT / TARGET_CHAR_BIT,
263 0, "SCM", (struct objfile *) NULL);