1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
2 Copyright 1995 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, Boston, MA 02111-1307, USA. */
23 #include "expression.h"
24 #include "parser-defs.h"
30 #include "gdb_string.h"
33 extern void _initialize_scheme_language PARAMS ((void));
34 static value_ptr evaluate_subexp_scm PARAMS ((struct type *, struct expression *,
36 static value_ptr scm_lookup_name PARAMS ((char *));
37 static int in_eval_c PARAMS ((void));
38 static void scm_printstr PARAMS ((GDB_FILE *stream, char *string, unsigned int length, int width, int force_ellipses));
40 extern struct type ** CONST_PTR (c_builtin_types[]);
42 struct type *builtin_type_scm;
45 scm_printchar (c, stream)
49 fprintf_filtered (stream, "#\\%c", c);
53 scm_printstr (stream, string, length, width, force_ellipses)
60 fprintf_filtered (stream, "\"%s\"", string);
64 is_scmvalue_type (type)
67 if (TYPE_CODE (type) == TYPE_CODE_INT
68 && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
75 /* Get the INDEX'th SCM value, assuming SVALUE is the address
79 scm_get_field (svalue, index)
84 read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
85 buffer, TYPE_LENGTH (builtin_type_scm));
86 return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
89 /* Unpack a value of type TYPE in buffer VALADDR as an integer
90 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
91 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
94 scm_unpack (type, valaddr, context)
97 enum type_code context;
99 if (is_scmvalue_type (type))
101 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
102 if (context == TYPE_CODE_BOOL)
104 if (svalue == SCM_BOOL_F)
109 switch (7 & (int) svalue)
111 case 2: case 6: /* fixnum */
113 case 4: /* other immediate value */
114 if (SCM_ICHRP (svalue)) /* character */
115 return SCM_ICHR (svalue);
116 else if (SCM_IFLAGP (svalue))
118 switch ((int) svalue)
129 error ("Value can't be converted to integer.");
135 return unpack_long (type, valaddr);
138 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
143 if (current_source_symtab && current_source_symtab->filename)
145 char *filename = current_source_symtab->filename;
146 int len = strlen (filename);
147 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
153 /* Lookup a value for the variable named STR.
154 First lookup in Scheme context (using the scm_lookup_cstr inferior
155 function), then try lookup_symbol for compiled variables. */
158 scm_lookup_name (str)
162 int len = strlen (str);
165 args[0] = value_allocate_space_in_inferior (len);
166 args[1] = value_from_longest (builtin_type_int, len);
167 write_memory (value_as_long (args[0]), str, len);
170 && (sym = lookup_symbol ("env",
171 expression_context_block,
172 VAR_NAMESPACE, (int *) NULL,
173 (struct symtab **) NULL)) != NULL)
174 args[2] = value_of_variable (sym, expression_context_block);
176 /* FIXME in this case, we should try lookup_symbol first */
177 args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
179 func = find_function_in_inferior ("scm_lookup_cstr");
180 val = call_function_by_hand (func, 3, args);
181 if (!value_logical_not (val))
182 return value_ind (val);
184 sym = lookup_symbol (str,
185 expression_context_block,
186 VAR_NAMESPACE, (int *) NULL,
187 (struct symtab **) NULL);
189 return value_of_variable (sym, NULL);
190 error ("No symbol \"%s\" in current context.");
194 scm_evaluate_string (str, len)
198 value_ptr addr = value_allocate_space_in_inferior (len + 1);
199 LONGEST iaddr = value_as_long (addr);
200 write_memory (iaddr, str, len);
201 /* FIXME - should find and pass env */
202 write_memory (iaddr + len, "", 1);
203 func = find_function_in_inferior ("scm_evstr");
204 return call_function_by_hand (func, 1, &addr);
208 evaluate_subexp_scm (expect_type, exp, pos, noside)
209 struct type *expect_type;
210 register struct expression *exp;
214 enum exp_opcode op = exp->elts[*pos].opcode;
215 int len, pc; char *str;
220 len = longest_to_int (exp->elts[pc + 1].longconst);
221 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
222 if (noside == EVAL_SKIP)
224 str = &exp->elts[pc + 2].string;
225 return scm_lookup_name (str);
228 len = longest_to_int (exp->elts[pc + 1].longconst);
229 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
230 if (noside == EVAL_SKIP)
232 str = &exp->elts[pc + 2].string;
233 return scm_evaluate_string (str, len);
236 return evaluate_subexp_standard (expect_type, exp, pos, noside);
238 return value_from_longest (builtin_type_long, (LONGEST) 1);
241 const struct language_defn scm_language_defn = {
242 "scheme", /* Language name */
250 scm_printchar, /* Print a character constant */
251 scm_printstr, /* Function to print string constant */
252 NULL, /* Function to print a single character */
253 NULL, /* Create fundamental type in this language */
254 c_print_type, /* Print a type using appropriate syntax */
255 scm_val_print, /* Print a value using appropriate syntax */
256 scm_value_print, /* Print a top-level value */
257 {"", "", "", ""}, /* Binary format info */
258 {"#o%lo", "#o", "o", ""}, /* Octal format info */
259 {"%ld", "", "d", ""}, /* Decimal format info */
260 {"#x%lX", "#X", "X", ""}, /* Hex format info */
261 NULL, /* expression operators for printing */
262 1, /* c-style arrays */
263 0, /* String lower bound */
264 &builtin_type_char, /* Type of string elements */
269 _initialize_scheme_language ()
271 add_language (&scm_language_defn);
272 builtin_type_scm = init_type (TYPE_CODE_INT,
273 TARGET_LONG_BIT / TARGET_CHAR_BIT,
274 0, "SCM", (struct objfile *) NULL);