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/* Scheme/Guile language support routines for GDB, the GNU debugger.
Copyright 1995 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "value.h"
#include "c-lang.h"
#include "scm-lang.h"
#include "scm-tags.h"
#include "gdb_string.h"
#include "gdbcore.h"
static value_ptr evaluate_subexp_scm PARAMS ((struct type *, struct expression *,
int *, enum noside));
static value_ptr scm_lookup_name PARAMS ((char *));
static int in_eval_c PARAMS ((void));
static void scm_printstr PARAMS ((GDB_FILE *, char *, unsigned int, int));
extern struct type ** const (c_builtin_types[]);
struct type *builtin_type_scm;
void
scm_printchar (c, stream)
int c;
GDB_FILE *stream;
{
fprintf_filtered (stream, "#\\%c", c);
}
static void
scm_printstr (stream, string, length, force_ellipses)
GDB_FILE *stream;
char *string;
unsigned int length;
int force_ellipses;
{
fprintf_filtered (stream, "\"%s\"", string);
}
int
is_scmvalue_type (type)
struct type *type;
{
if (TYPE_CODE (type) == TYPE_CODE_INT
&& TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
{
return 1;
}
return 0;
}
/* Get the INDEX'th SCM value, assuming SVALUE is the address
of the 0'th one. */
LONGEST
scm_get_field (svalue, index)
LONGEST svalue;
int index;
{
char buffer[20];
read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
buffer, TYPE_LENGTH (builtin_type_scm));
return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
}
/* Unpack a value of type TYPE in buffer VALADDR as an integer
(if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
or Boolean (CONTEXT == TYPE_CODE_BOOL). */
LONGEST
scm_unpack (type, valaddr, context)
struct type *type;
char *valaddr;
enum type_code context;
{
if (is_scmvalue_type (type))
{
LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
if (context == TYPE_CODE_BOOL)
{
if (svalue == SCM_BOOL_F)
return 0;
else
return 1;
}
switch (7 & svalue)
{
case 2: case 6: /* fixnum */
return svalue >> 2;
case 4: /* other immediate value */
if (SCM_ICHRP (svalue)) /* character */
return SCM_ICHR (svalue);
else if (SCM_IFLAGP (svalue))
{
switch (svalue)
{
#ifndef SICP
case SCM_EOL:
#endif
case SCM_BOOL_F:
return 0;
case SCM_BOOL_T:
return 1;
}
}
error ("Value can't be converted to integer.");
default:
return svalue;
}
}
else
return unpack_long (type, valaddr);
}
/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
static int
in_eval_c ()
{
if (current_source_symtab && current_source_symtab->filename)
{
char *filename = current_source_symtab->filename;
int len = strlen (filename);
if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
return 1;
}
return 0;
}
/* Lookup a value for the variable named STR.
First lookup in Scheme context (using the scm_lookup_cstr inferior
function), then try lookup_symbol for compiled variables. */
static value_ptr
scm_lookup_name (str)
char *str;
{
value_ptr args[3];
int len = strlen (str);
value_ptr func, val;
struct symbol *sym;
args[0] = value_allocate_space_in_inferior (len);
args[1] = value_from_longest (builtin_type_int, len);
write_memory (value_as_long (args[0]), str, len);
if (in_eval_c ()
&& (sym = lookup_symbol ("env",
expression_context_block,
VAR_NAMESPACE, (int *) NULL,
(struct symtab **) NULL)) != NULL)
args[2] = value_of_variable (sym, expression_context_block);
else
/* FIXME in this case, we should try lookup_symbol first */
args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
func = find_function_in_inferior ("scm_lookup_cstr");
val = call_function_by_hand (func, 3, args);
if (!value_logical_not (val))
return value_ind (val);
sym = lookup_symbol (str,
expression_context_block,
VAR_NAMESPACE, (int *) NULL,
(struct symtab **) NULL);
if (sym)
return value_of_variable (sym, NULL);
error ("No symbol \"%s\" in current context.");
}
value_ptr
scm_evaluate_string (str, len)
char *str; int len;
{
value_ptr func;
value_ptr addr = value_allocate_space_in_inferior (len + 1);
LONGEST iaddr = value_as_long (addr);
write_memory (iaddr, str, len);
/* FIXME - should find and pass env */
write_memory (iaddr + len, "", 1);
func = find_function_in_inferior ("scm_evstr");
return call_function_by_hand (func, 1, &addr);
}
static value_ptr
evaluate_subexp_scm (expect_type, exp, pos, noside)
struct type *expect_type;
register struct expression *exp;
register int *pos;
enum noside noside;
{
enum exp_opcode op = exp->elts[*pos].opcode;
int len, pc; char *str;
switch (op)
{
case OP_NAME:
pc = (*pos)++;
len = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
if (noside == EVAL_SKIP)
goto nosideret;
str = &exp->elts[pc + 2].string;
return scm_lookup_name (str);
case OP_EXPRSTRING:
pc = (*pos)++;
len = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
if (noside == EVAL_SKIP)
goto nosideret;
str = &exp->elts[pc + 2].string;
return scm_evaluate_string (str, len);
default: ;
}
return evaluate_subexp_standard (expect_type, exp, pos, noside);
nosideret:
return value_from_longest (builtin_type_long, (LONGEST) 1);
}
const struct language_defn scm_language_defn = {
"scheme", /* Language name */
language_scm,
c_builtin_types,
range_check_off,
type_check_off,
scm_parse,
c_error,
evaluate_subexp_scm,
scm_printchar, /* Print a character constant */
scm_printstr, /* Function to print string constant */
NULL, /* Create fundamental type in this language */
c_print_type, /* Print a type using appropriate syntax */
scm_val_print, /* Print a value using appropriate syntax */
scm_value_print, /* Print a top-level value */
{"", "", "", ""}, /* Binary format info */
{"#o%lo", "#o", "o", ""}, /* Octal format info */
{"%ld", "", "d", ""}, /* Decimal format info */
{"#x%lX", "#X", "X", ""}, /* Hex format info */
NULL, /* expression operators for printing */
1, /* c-style arrays */
0, /* String lower bound */
&builtin_type_char, /* Type of string elements */
LANG_MAGIC
};
void
_initialize_scheme_language ()
{
add_language (&scm_language_defn);
builtin_type_scm = init_type (TYPE_CODE_INT,
TARGET_LONG_BIT / TARGET_CHAR_BIT,
0, "SCM", (struct objfile *) NULL);
}
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