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"
32 #include "gdb_string.h"
35 extern void _initialize_scheme_language (void);
36 static struct value
*evaluate_subexp_scm (struct type
*, struct expression
*,
38 static struct value
*scm_lookup_name (char *);
39 static int in_eval_c (void);
40 static void scm_printstr (struct ui_file
* stream
, char *string
,
41 unsigned int length
, int width
,
44 extern struct type
**const (c_builtin_types
[]);
46 struct type
*builtin_type_scm
;
49 scm_printchar (int c
, struct ui_file
*stream
)
51 fprintf_filtered (stream
, "#\\%c", c
);
55 scm_printstr (struct ui_file
*stream
, char *string
, unsigned int length
,
56 int width
, int force_ellipses
)
58 fprintf_filtered (stream
, "\"%s\"", string
);
62 is_scmvalue_type (struct type
*type
)
64 if (TYPE_CODE (type
) == TYPE_CODE_INT
65 && TYPE_NAME (type
) && strcmp (TYPE_NAME (type
), "SCM") == 0)
72 /* Get the INDEX'th SCM value, assuming SVALUE is the address
76 scm_get_field (LONGEST svalue
, int index
)
79 read_memory (SCM2PTR (svalue
) + index
* TYPE_LENGTH (builtin_type_scm
),
80 buffer
, TYPE_LENGTH (builtin_type_scm
));
81 return extract_signed_integer (buffer
, TYPE_LENGTH (builtin_type_scm
));
84 /* Unpack a value of type TYPE in buffer VALADDR as an integer
85 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
86 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
89 scm_unpack (struct type
*type
, char *valaddr
, enum type_code context
)
91 if (is_scmvalue_type (type
))
93 LONGEST svalue
= extract_signed_integer (valaddr
, TYPE_LENGTH (type
));
94 if (context
== TYPE_CODE_BOOL
)
96 if (svalue
== SCM_BOOL_F
)
101 switch (7 & (int) svalue
)
106 case 4: /* other immediate value */
107 if (SCM_ICHRP (svalue
)) /* character */
108 return SCM_ICHR (svalue
);
109 else if (SCM_IFLAGP (svalue
))
111 switch ((int) svalue
)
122 error ("Value can't be converted to integer.");
128 return unpack_long (type
, valaddr
);
131 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
136 if (current_source_symtab
&& current_source_symtab
->filename
)
138 char *filename
= current_source_symtab
->filename
;
139 int len
= strlen (filename
);
140 if (len
>= 6 && strcmp (filename
+ len
- 6, "eval.c") == 0)
146 /* Lookup a value for the variable named STR.
147 First lookup in Scheme context (using the scm_lookup_cstr inferior
148 function), then try lookup_symbol for compiled variables. */
150 static struct value
*
151 scm_lookup_name (char *str
)
153 struct value
*args
[3];
154 int len
= strlen (str
);
158 args
[0] = value_allocate_space_in_inferior (len
);
159 args
[1] = value_from_longest (builtin_type_int
, len
);
160 write_memory (value_as_long (args
[0]), str
, len
);
163 && (sym
= lookup_symbol ("env",
164 expression_context_block
,
165 VAR_NAMESPACE
, (int *) NULL
,
166 (struct symtab
**) NULL
)) != NULL
)
167 args
[2] = value_of_variable (sym
, expression_context_block
);
169 /* FIXME in this case, we should try lookup_symbol first */
170 args
[2] = value_from_longest (builtin_type_scm
, SCM_EOL
);
172 func
= find_function_in_inferior ("scm_lookup_cstr");
173 val
= call_function_by_hand (func
, 3, args
);
174 if (!value_logical_not (val
))
175 return value_ind (val
);
177 sym
= lookup_symbol (str
,
178 expression_context_block
,
179 VAR_NAMESPACE
, (int *) NULL
,
180 (struct symtab
**) NULL
);
182 return value_of_variable (sym
, NULL
);
183 error ("No symbol \"%s\" in current context.", str
);
187 scm_evaluate_string (char *str
, int len
)
190 struct value
*addr
= value_allocate_space_in_inferior (len
+ 1);
191 LONGEST iaddr
= value_as_long (addr
);
192 write_memory (iaddr
, str
, len
);
193 /* FIXME - should find and pass env */
194 write_memory (iaddr
+ len
, "", 1);
195 func
= find_function_in_inferior ("scm_evstr");
196 return call_function_by_hand (func
, 1, &addr
);
199 static struct value
*
200 evaluate_subexp_scm (struct type
*expect_type
, register struct expression
*exp
,
201 register int *pos
, enum noside noside
)
203 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
210 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
211 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
212 if (noside
== EVAL_SKIP
)
214 str
= &exp
->elts
[pc
+ 2].string
;
215 return scm_lookup_name (str
);
218 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
219 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
220 if (noside
== EVAL_SKIP
)
222 str
= &exp
->elts
[pc
+ 2].string
;
223 return scm_evaluate_string (str
, len
);
226 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
228 return value_from_longest (builtin_type_long
, (LONGEST
) 1);
231 const struct language_defn scm_language_defn
=
233 "scheme", /* Language name */
242 scm_printchar
, /* Print a character constant */
243 scm_printstr
, /* Function to print string constant */
244 NULL
, /* Function to print a single character */
245 NULL
, /* Create fundamental type in this language */
246 c_print_type
, /* Print a type using appropriate syntax */
247 scm_val_print
, /* Print a value using appropriate syntax */
248 scm_value_print
, /* Print a top-level value */
249 {"", "", "", ""}, /* Binary format info */
250 {"#o%lo", "#o", "o", ""}, /* Octal format info */
251 {"%ld", "", "d", ""}, /* Decimal format info */
252 {"#x%lX", "#X", "X", ""}, /* Hex format info */
253 NULL
, /* expression operators for printing */
254 1, /* c-style arrays */
255 0, /* String lower bound */
256 &builtin_type_char
, /* Type of string elements */
261 _initialize_scheme_language (void)
263 add_language (&scm_language_defn
);
264 builtin_type_scm
= init_type (TYPE_CODE_INT
,
265 TARGET_LONG_BIT
/ TARGET_CHAR_BIT
,
266 0, "SCM", (struct objfile
*) NULL
);