286 lines
7.9 KiB
C
286 lines
7.9 KiB
C
/* Scheme/Guile language support routines for GDB, the GNU debugger.
|
|
|
|
Copyright 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004 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 "source.h"
|
|
#include "gdb_string.h"
|
|
#include "gdbcore.h"
|
|
#include "infcall.h"
|
|
|
|
extern void _initialize_scheme_language (void);
|
|
static struct value *evaluate_subexp_scm (struct type *, struct expression *,
|
|
int *, enum noside);
|
|
static struct value *scm_lookup_name (char *);
|
|
static int in_eval_c (void);
|
|
static void scm_printstr (struct ui_file * stream, char *string,
|
|
unsigned int length, int width,
|
|
int force_ellipses);
|
|
|
|
struct type *builtin_type_scm;
|
|
|
|
void
|
|
scm_printchar (int c, struct ui_file *stream)
|
|
{
|
|
fprintf_filtered (stream, "#\\%c", c);
|
|
}
|
|
|
|
static void
|
|
scm_printstr (struct ui_file *stream, char *string, unsigned int length,
|
|
int width, int force_ellipses)
|
|
{
|
|
fprintf_filtered (stream, "\"%s\"", string);
|
|
}
|
|
|
|
int
|
|
is_scmvalue_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 (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 (struct type *type, const 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 & (int) 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 ((int) 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 (void)
|
|
{
|
|
struct symtab_and_line cursal = get_current_source_symtab_and_line ();
|
|
|
|
if (cursal.symtab && cursal.symtab->filename)
|
|
{
|
|
char *filename = cursal.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 struct value *
|
|
scm_lookup_name (char *str)
|
|
{
|
|
struct value *args[3];
|
|
int len = strlen (str);
|
|
struct value *func;
|
|
struct value *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_DOMAIN, (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_DOMAIN, (int *) NULL,
|
|
(struct symtab **) NULL);
|
|
if (sym)
|
|
return value_of_variable (sym, NULL);
|
|
error ("No symbol \"%s\" in current context.", str);
|
|
}
|
|
|
|
struct value *
|
|
scm_evaluate_string (char *str, int len)
|
|
{
|
|
struct value *func;
|
|
struct value *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 struct value *
|
|
evaluate_subexp_scm (struct type *expect_type, struct expression *exp,
|
|
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 exp_descriptor exp_descriptor_scm =
|
|
{
|
|
print_subexp_standard,
|
|
operator_length_standard,
|
|
op_name_standard,
|
|
dump_subexp_body_standard,
|
|
evaluate_subexp_scm
|
|
};
|
|
|
|
const struct language_defn scm_language_defn =
|
|
{
|
|
"scheme", /* Language name */
|
|
language_scm,
|
|
NULL,
|
|
range_check_off,
|
|
type_check_off,
|
|
case_sensitive_off,
|
|
array_row_major,
|
|
&exp_descriptor_scm,
|
|
scm_parse,
|
|
c_error,
|
|
null_post_parser,
|
|
scm_printchar, /* Print a character constant */
|
|
scm_printstr, /* Function to print string constant */
|
|
NULL, /* Function to print a single character */
|
|
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 */
|
|
NULL, /* Language specific skip_trampoline */
|
|
value_of_this, /* value_of_this */
|
|
basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
|
|
basic_lookup_transparent_type,/* lookup_transparent_type */
|
|
NULL, /* Language specific symbol demangler */
|
|
NULL, /* Language specific class_name_from_physname */
|
|
NULL, /* expression operators for printing */
|
|
1, /* c-style arrays */
|
|
0, /* String lower bound */
|
|
NULL,
|
|
default_word_break_characters,
|
|
c_language_arch_info,
|
|
LANG_MAGIC
|
|
};
|
|
|
|
void
|
|
_initialize_scheme_language (void)
|
|
{
|
|
add_language (&scm_language_defn);
|
|
builtin_type_scm = init_type (TYPE_CODE_INT,
|
|
TARGET_LONG_BIT / TARGET_CHAR_BIT,
|
|
0, "SCM", (struct objfile *) NULL);
|
|
}
|