[deliverable/binutils-gdb.git] / gdb / scm-lang.c

/* 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"

extern struct type ** const (c_builtin_types[]);
extern value_ptr value_allocate_space_in_inferior PARAMS ((int));
extern value_ptr find_function_in_inferior PARAMS ((char*));

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;
{
  value_ptr val;
  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. */

value_ptr
scm_lookup_name (str)
     char *str;
{
  value_ptr args[3];
  int len = strlen (str);
  value_ptr symval, 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);
}
Commit	Line	Data
0e4ca328 PB	1	/* Scheme/Guile language support routines for GDB, the GNU debugger.
	2	Copyright 1995 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	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.
	10
	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.
	15
	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. */
	19
	20	#include "defs.h"
	21	#include "symtab.h"
	22	#include "gdbtypes.h"
	23	#include "expression.h"
	24	#include "parser-defs.h"
	25	#include "language.h"
0e4ca328	26	#include "value.h"
5b4d668a PB	27	#include "c-lang.h"
	28	#include "scm-lang.h"
	29	#include "scm-tags.h"
0e4ca328 PB	30
	31	extern struct type ** const (c_builtin_types[]);
	32	extern value_ptr value_allocate_space_in_inferior PARAMS ((int));
	33	extern value_ptr find_function_in_inferior PARAMS ((char*));
	34
3c02944a	35	struct type *builtin_type_scm;
0e4ca328	36
5b4d668a	37	void
0e4ca328 PB	38	scm_printchar (c, stream)
	39	int c;
	40	GDB_FILE *stream;
	41	{
	42	fprintf_filtered (stream, "#\\%c", c);
	43	}
	44
	45	static void
	46	scm_printstr (stream, string, length, force_ellipses)
	47	GDB_FILE *stream;
	48	char *string;
	49	unsigned int length;
	50	int force_ellipses;
	51	{
	52	fprintf_filtered (stream, "\"%s\"", string);
	53	}
	54
	55	int
5b4d668a	56	is_scmvalue_type (type)
0e4ca328	57	struct type *type;
0e4ca328	58	{
5b4d668a PB	59	if (TYPE_CODE (type) == TYPE_CODE_INT
5b4d668a PB	60	&& TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
0e4ca328	61	{
5b4d668a	62	return 1;
0e4ca328	63	}
5b4d668a	64	return 0;
0e4ca328 PB	65	}
0e4ca328 PB	66
5b4d668a PB	67	/* Get the INDEX'th SCM value, assuming SVALUE is the address
	68	of the 0'th one. */
	69
	70	LONGEST
	71	scm_get_field (svalue, index)
	72	LONGEST svalue;
	73	int index;
0e4ca328	74	{
5b4d668a PB	75	value_ptr val;
5b4d668a PB	76	char buffer[20];
3c02944a PB	77	read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
	78	buffer, TYPE_LENGTH (builtin_type_scm));
	79	return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
	80	}
	81
	82	/* Unpack a value of type TYPE in buffer VALADDR as an integer
	83	(if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
	84	or Boolean (CONTEXT == TYPE_CODE_BOOL). */
	85
	86	LONGEST
	87	scm_unpack (type, valaddr, context)
	88	struct type *type;
	89	char *valaddr;
	90	enum type_code context;
	91	{
	92	if (is_scmvalue_type (type))
	93	{
	94	LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
	95	if (context == TYPE_CODE_BOOL)
	96	{
	97	if (svalue == SCM_BOOL_F)
	98	return 0;
	99	else
	100	return 1;
	101	}
	102	switch (7 & svalue)
	103	{
	104	case 2: case 6: /* fixnum */
	105	return svalue >> 2;
	106	case 4: /* other immediate value */
	107	if (SCM_ICHRP (svalue)) /* character */
	108	return SCM_ICHR (svalue);
	109	else if (SCM_IFLAGP (svalue))
	110	{
	111	switch (svalue)
	112	{
	113	#ifndef SICP
	114	case SCM_EOL:
	115	#endif
	116	case SCM_BOOL_F:
	117	return 0;
	118	case SCM_BOOL_T:
	119	return 1;
	120	}
	121	}
	122	error ("Value can't be converted to integer.");
	123	default:
	124	return svalue;
	125	}
	126	}
	127	else
	128	return unpack_long (type, valaddr);
	129	}
	130
	131	/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
	132
	133	static int
	134	in_eval_c ()
	135	{
	136	if (current_source_symtab && current_source_symtab->filename)
	137	{
	138	char *filename = current_source_symtab->filename;
	139	int len = strlen (filename);
	140	if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
141	return 1;
142	}
143	return 0;
144	}
145
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. */
149
150	value_ptr
151	scm_lookup_name (str)
152	char *str;
153	{
154	value_ptr args[3];
155	int len = strlen (str);
156	value_ptr symval, func, val;
157	struct symbol *sym;
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);
161
162	if (in_eval_c ()
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);
168	else
169	/* FIXME in this case, we should try lookup_symbol first */
170	args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
171
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);
176
177	sym = lookup_symbol (str,
178	expression_context_block,
179	VAR_NAMESPACE, (int *) NULL,
180	(struct symtab **) NULL);
181	if (sym)
182	return value_of_variable (sym, NULL);
183	error ("No symbol \"%s\" in current context.");
184	}
185
186	value_ptr
187	scm_evaluate_string (str, len)
188	char *str; int len;
189	{
190	value_ptr func;
191	value_ptr addr = value_allocate_space_in_inferior (len + 1);
192	LONGEST iaddr = value_as_long (addr);
193	write_memory (iaddr, str, len);
194	/* FIXME - should find and pass env */
195	write_memory (iaddr + len, "", 1);
196	func = find_function_in_inferior ("scm_evstr");
197	return call_function_by_hand (func, 1, &addr);
0e4ca328 PB	198	}
	199
	200	static value_ptr
	201	evaluate_subexp_scm (expect_type, exp, pos, noside)
	202	struct type *expect_type;
	203	register struct expression *exp;
	204	register int *pos;
	205	enum noside noside;
	206	{
	207	enum exp_opcode op = exp->elts[*pos].opcode;
0e4ca328 PB	208	int len, pc; char *str;
	209	switch (op)
	210	{
3c02944a PB	211	case OP_NAME:
	212	pc = (*pos)++;
	213	len = longest_to_int (exp->elts[pc + 1].longconst);
	214	(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
	215	if (noside == EVAL_SKIP)
	216	goto nosideret;
	217	str = &exp->elts[pc + 2].string;
	218	return scm_lookup_name (str);
0e4ca328 PB	219	case OP_EXPRSTRING:
	220	pc = (*pos)++;
	221	len = longest_to_int (exp->elts[pc + 1].longconst);
	222	(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
	223	if (noside == EVAL_SKIP)
	224	goto nosideret;
3c02944a PB	225	str = &exp->elts[pc + 2].string;
3c02944a PB	226	return scm_evaluate_string (str, len);
0e4ca328 PB	227	default: ;
	228	}
	229	return evaluate_subexp_standard (expect_type, exp, pos, noside);
	230	nosideret:
	231	return value_from_longest (builtin_type_long, (LONGEST) 1);
	232	}
	233
	234	const struct language_defn scm_language_defn = {
	235	"scheme", /* Language name */
	236	language_scm,
	237	c_builtin_types,
	238	range_check_off,
	239	type_check_off,
	240	scm_parse,
	241	c_error,
	242	evaluate_subexp_scm,
	243	scm_printchar, /* Print a character constant */
	244	scm_printstr, /* Function to print string constant */
	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 */
	257	LANG_MAGIC
	258	};
	259
	260	void
	261	_initialize_scheme_language ()
	262	{
	263	add_language (&scm_language_defn);
3c02944a PB	264	builtin_type_scm = init_type (TYPE_CODE_INT,
	265	TARGET_LONG_BIT / TARGET_CHAR_BIT,
	266	0, "SCM", (struct objfile *) NULL);
0e4ca328	267	}