1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
3 Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007 Free
4 Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "expression.h"
25 #include "parser-defs.h"
32 #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);
42 struct type
*builtin_type_scm
;
45 scm_printchar (int c
, struct ui_file
*stream
)
47 fprintf_filtered (stream
, "#\\%c", c
);
51 scm_printstr (struct ui_file
*stream
, const gdb_byte
*string
,
52 unsigned int length
, int width
, int force_ellipses
)
54 fprintf_filtered (stream
, "\"%s\"", string
);
58 is_scmvalue_type (struct type
*type
)
60 if (TYPE_NAME (type
) && strcmp (TYPE_NAME (type
), "SCM") == 0)
67 /* Get the INDEX'th SCM value, assuming SVALUE is the address
71 scm_get_field (LONGEST svalue
, int index
)
74 read_memory (SCM2PTR (svalue
) + index
* TYPE_LENGTH (builtin_type_scm
),
75 buffer
, TYPE_LENGTH (builtin_type_scm
));
76 return extract_signed_integer (buffer
, TYPE_LENGTH (builtin_type_scm
));
79 /* Unpack a value of type TYPE in buffer VALADDR as an integer
80 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
81 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
84 scm_unpack (struct type
*type
, const gdb_byte
*valaddr
, enum type_code context
)
86 if (is_scmvalue_type (type
))
88 LONGEST svalue
= extract_signed_integer (valaddr
, TYPE_LENGTH (type
));
89 if (context
== TYPE_CODE_BOOL
)
91 if (svalue
== SCM_BOOL_F
)
96 switch (7 & (int) svalue
)
101 case 4: /* other immediate value */
102 if (SCM_ICHRP (svalue
)) /* character */
103 return SCM_ICHR (svalue
);
104 else if (SCM_IFLAGP (svalue
))
106 switch ((int) svalue
)
117 error (_("Value can't be converted to integer."));
123 return unpack_long (type
, valaddr
);
126 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
131 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
133 if (cursal
.symtab
&& cursal
.symtab
->filename
)
135 char *filename
= cursal
.symtab
->filename
;
136 int len
= strlen (filename
);
137 if (len
>= 6 && strcmp (filename
+ len
- 6, "eval.c") == 0)
143 /* Lookup a value for the variable named STR.
144 First lookup in Scheme context (using the scm_lookup_cstr inferior
145 function), then try lookup_symbol for compiled variables. */
147 static struct value
*
148 scm_lookup_name (char *str
)
150 struct value
*args
[3];
151 int len
= strlen (str
);
155 args
[0] = value_allocate_space_in_inferior (len
);
156 args
[1] = value_from_longest (builtin_type_int
, len
);
157 write_memory (value_as_long (args
[0]), (gdb_byte
*) str
, len
);
160 && (sym
= lookup_symbol ("env",
161 expression_context_block
,
162 VAR_DOMAIN
, (int *) NULL
,
163 (struct symtab
**) NULL
)) != NULL
)
164 args
[2] = value_of_variable (sym
, expression_context_block
);
166 /* FIXME in this case, we should try lookup_symbol first */
167 args
[2] = value_from_longest (builtin_type_scm
, SCM_EOL
);
169 func
= find_function_in_inferior ("scm_lookup_cstr");
170 val
= call_function_by_hand (func
, 3, args
);
171 if (!value_logical_not (val
))
172 return value_ind (val
);
174 sym
= lookup_symbol (str
,
175 expression_context_block
,
176 VAR_DOMAIN
, (int *) NULL
,
177 (struct symtab
**) NULL
);
179 return value_of_variable (sym
, NULL
);
180 error (_("No symbol \"%s\" in current context."), str
);
184 scm_evaluate_string (char *str
, int len
)
187 struct value
*addr
= value_allocate_space_in_inferior (len
+ 1);
188 LONGEST iaddr
= value_as_long (addr
);
189 write_memory (iaddr
, (gdb_byte
*) str
, len
);
190 /* FIXME - should find and pass env */
191 write_memory (iaddr
+ len
, (gdb_byte
*) "", 1);
192 func
= find_function_in_inferior ("scm_evstr");
193 return call_function_by_hand (func
, 1, &addr
);
196 static struct value
*
197 evaluate_exp (struct type
*expect_type
, struct expression
*exp
,
198 int *pos
, enum noside noside
)
200 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
207 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
208 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
209 if (noside
== EVAL_SKIP
)
211 str
= &exp
->elts
[pc
+ 2].string
;
212 return scm_lookup_name (str
);
215 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
216 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
217 if (noside
== EVAL_SKIP
)
219 str
= &exp
->elts
[pc
+ 2].string
;
220 return scm_evaluate_string (str
, len
);
223 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
225 return value_from_longest (builtin_type_long
, (LONGEST
) 1);
228 const struct exp_descriptor exp_descriptor_scm
=
230 print_subexp_standard
,
231 operator_length_standard
,
233 dump_subexp_body_standard
,
237 const struct language_defn scm_language_defn
=
239 "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 NULL
, /* Language specific skip_trampoline */
258 value_of_this
, /* value_of_this */
259 basic_lookup_symbol_nonlocal
, /* lookup_symbol_nonlocal */
260 basic_lookup_transparent_type
,/* lookup_transparent_type */
261 NULL
, /* Language specific symbol demangler */
262 NULL
, /* Language specific class_name_from_physname */
263 NULL
, /* expression operators for printing */
264 1, /* c-style arrays */
265 0, /* String lower bound */
267 default_word_break_characters
,
268 c_language_arch_info
,
269 default_print_array_index
,
270 default_pass_by_reference
,
275 _initialize_scheme_language (void)
277 add_language (&scm_language_defn
);
279 init_type (TYPE_CODE_INT
,
280 gdbarch_long_bit (current_gdbarch
) / TARGET_CHAR_BIT
,
281 0, "SCM", (struct objfile
*) NULL
);