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

/* Scheme/Guile language support routines for GDB, the GNU debugger.
   Copyright 1995, 2000 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"

extern void _initialize_scheme_language PARAMS ((void));
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 (struct ui_file * stream, char *string,
			  unsigned int length, int width,
			  int force_ellipses);

extern struct type **CONST_PTR (c_builtin_types[]);

struct type *builtin_type_scm;

void
scm_printchar (c, stream)
     int c;
     struct ui_file *stream;
{
  fprintf_filtered (stream, "#\\%c", c);
}

static void
scm_printstr (stream, string, length, width, force_ellipses)
     struct ui_file *stream;
     char *string;
     unsigned int length;
     int width;
     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 & (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 ()
{
  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,				/* 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 */
  {"", "", "", ""},		/* 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
c906108c	1	/* Scheme/Guile language support routines for GDB, the GNU debugger.
d9fcf2fb	2	Copyright 1995, 2000 Free Software Foundation, Inc.
c906108c	3
c5aa993b	4	This file is part of GDB.
c906108c	5
c5aa993b JM	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.
c906108c	10
c5aa993b JM	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.
c906108c	15
c5aa993b JM	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,
	19	Boston, MA 02111-1307, USA. */
c906108c SS	20
	21	#include "defs.h"
	22	#include "symtab.h"
	23	#include "gdbtypes.h"
	24	#include "expression.h"
	25	#include "parser-defs.h"
	26	#include "language.h"
	27	#include "value.h"
	28	#include "c-lang.h"
	29	#include "scm-lang.h"
	30	#include "scm-tags.h"
	31	#include "gdb_string.h"
	32	#include "gdbcore.h"
	33
392a587b	34	extern void _initialize_scheme_language PARAMS ((void));
c906108c SS	35	static value_ptr evaluate_subexp_scm PARAMS ((struct type , struct expression ,
	36	int *, enum noside));
	37	static value_ptr scm_lookup_name PARAMS ((char *));
	38	static int in_eval_c PARAMS ((void));
d9fcf2fb JM	39	static void scm_printstr (struct ui_file * stream, char *string,
	40	unsigned int length, int width,
	41	int force_ellipses);
c906108c	42
c5aa993b	43	extern struct type **CONST_PTR (c_builtin_types[]);
c906108c SS	44
	45	struct type *builtin_type_scm;
	46
	47	void
	48	scm_printchar (c, stream)
	49	int c;
d9fcf2fb	50	struct ui_file *stream;
c906108c SS	51	{
	52	fprintf_filtered (stream, "#\\%c", c);
	53	}
	54
	55	static void
	56	scm_printstr (stream, string, length, width, force_ellipses)
d9fcf2fb	57	struct ui_file *stream;
c906108c SS	58	char *string;
	59	unsigned int length;
	60	int width;
	61	int force_ellipses;
	62	{
	63	fprintf_filtered (stream, "\"%s\"", string);
	64	}
	65
	66	int
	67	is_scmvalue_type (type)
	68	struct type *type;
	69	{
	70	if (TYPE_CODE (type) == TYPE_CODE_INT
	71	&& TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
	72	{
	73	return 1;
	74	}
	75	return 0;
	76	}
	77
	78	/* Get the INDEX'th SCM value, assuming SVALUE is the address
	79	of the 0'th one. */
	80
	81	LONGEST
	82	scm_get_field (svalue, index)
	83	LONGEST svalue;
	84	int index;
	85	{
	86	char buffer[20];
	87	read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
	88	buffer, TYPE_LENGTH (builtin_type_scm));
	89	return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
	90	}
	91
	92	/* Unpack a value of type TYPE in buffer VALADDR as an integer
	93	(if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
	94	or Boolean (CONTEXT == TYPE_CODE_BOOL). */
	95
	96	LONGEST
	97	scm_unpack (type, valaddr, context)
	98	struct type *type;
	99	char *valaddr;
	100	enum type_code context;
	101	{
	102	if (is_scmvalue_type (type))
	103	{
	104	LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
	105	if (context == TYPE_CODE_BOOL)
	106	{
	107	if (svalue == SCM_BOOL_F)
	108	return 0;
	109	else
	110	return 1;
	111	}
	112	switch (7 & (int) svalue)
	113	{
c5aa993b JM	114	case 2:
c5aa993b JM	115	case 6: /* fixnum */
c906108c	116	return svalue >> 2;
c5aa993b JM	117	case 4: /* other immediate value */
c5aa993b JM	118	if (SCM_ICHRP (svalue)) /* character */
c906108c SS	119	return SCM_ICHR (svalue);
	120	else if (SCM_IFLAGP (svalue))
	121	{
	122	switch ((int) svalue)
	123	{
	124	#ifndef SICP
	125	case SCM_EOL:
	126	#endif
	127	case SCM_BOOL_F:
	128	return 0;
	129	case SCM_BOOL_T:
	130	return 1;
	131	}
	132	}
	133	error ("Value can't be converted to integer.");
	134	default:
	135	return svalue;
	136	}
	137	}
	138	else
	139	return unpack_long (type, valaddr);
	140	}
	141
	142	/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
	143
	144	static int
	145	in_eval_c ()
	146	{
	147	if (current_source_symtab && current_source_symtab->filename)
	148	{
	149	char *filename = current_source_symtab->filename;
	150	int len = strlen (filename);
	151	if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
	152	return 1;
	153	}
	154	return 0;
	155	}
	156
	157	/* Lookup a value for the variable named STR.
	158	First lookup in Scheme context (using the scm_lookup_cstr inferior
	159	function), then try lookup_symbol for compiled variables. */
	160
	161	static value_ptr
	162	scm_lookup_name (str)
	163	char *str;
	164	{
	165	value_ptr args[3];
	166	int len = strlen (str);
	167	value_ptr func, val;
	168	struct symbol *sym;
	169	args[0] = value_allocate_space_in_inferior (len);
	170	args[1] = value_from_longest (builtin_type_int, len);
	171	write_memory (value_as_long (args[0]), str, len);
	172
	173	if (in_eval_c ()
	174	&& (sym = lookup_symbol ("env",
	175	expression_context_block,
	176	VAR_NAMESPACE, (int *) NULL,
	177	(struct symtab **) NULL)) != NULL)
	178	args[2] = value_of_variable (sym, expression_context_block);
	179	else
	180	/* FIXME in this case, we should try lookup_symbol first */
	181	args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
	182
183	func = find_function_in_inferior ("scm_lookup_cstr");
184	val = call_function_by_hand (func, 3, args);
185	if (!value_logical_not (val))
186	return value_ind (val);
187
188	sym = lookup_symbol (str,
189	expression_context_block,
190	VAR_NAMESPACE, (int *) NULL,
191	(struct symtab **) NULL);
192	if (sym)
193	return value_of_variable (sym, NULL);
194	error ("No symbol \"%s\" in current context.");
195	}
196
197	value_ptr
198	scm_evaluate_string (str, len)
c5aa993b JM	199	char *str;
c5aa993b JM	200	int len;
c906108c SS	201	{
	202	value_ptr func;
	203	value_ptr addr = value_allocate_space_in_inferior (len + 1);
	204	LONGEST iaddr = value_as_long (addr);
	205	write_memory (iaddr, str, len);
	206	/* FIXME - should find and pass env */
	207	write_memory (iaddr + len, "", 1);
	208	func = find_function_in_inferior ("scm_evstr");
	209	return call_function_by_hand (func, 1, &addr);
	210	}
	211
	212	static value_ptr
	213	evaluate_subexp_scm (expect_type, exp, pos, noside)
	214	struct type *expect_type;
	215	register struct expression *exp;
	216	register int *pos;
	217	enum noside noside;
	218	{
	219	enum exp_opcode op = exp->elts[*pos].opcode;
c5aa993b JM	220	int len, pc;
c5aa993b JM	221	char *str;
c906108c SS	222	switch (op)
	223	{
	224	case OP_NAME:
	225	pc = (*pos)++;
	226	len = longest_to_int (exp->elts[pc + 1].longconst);
	227	(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
	228	if (noside == EVAL_SKIP)
	229	goto nosideret;
	230	str = &exp->elts[pc + 2].string;
	231	return scm_lookup_name (str);
	232	case OP_EXPRSTRING:
	233	pc = (*pos)++;
	234	len = longest_to_int (exp->elts[pc + 1].longconst);
	235	(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
	236	if (noside == EVAL_SKIP)
	237	goto nosideret;
	238	str = &exp->elts[pc + 2].string;
	239	return scm_evaluate_string (str, len);
c5aa993b	240	default:;
c906108c SS	241	}
c906108c SS	242	return evaluate_subexp_standard (expect_type, exp, pos, noside);
c5aa993b	243	nosideret:
c906108c SS	244	return value_from_longest (builtin_type_long, (LONGEST) 1);
	245	}
	246
c5aa993b JM	247	const struct language_defn scm_language_defn =
c5aa993b JM	248	{
c906108c SS	249	"scheme", /* Language name */
	250	language_scm,
	251	c_builtin_types,
	252	range_check_off,
	253	type_check_off,
	254	scm_parse,
	255	c_error,
	256	evaluate_subexp_scm,
	257	scm_printchar, /* Print a character constant */
	258	scm_printstr, /* Function to print string constant */
	259	NULL, /* Function to print a single character */
	260	NULL, /* Create fundamental type in this language */
	261	c_print_type, /* Print a type using appropriate syntax */
	262	scm_val_print, /* Print a value using appropriate syntax */
	263	scm_value_print, /* Print a top-level value */
c5aa993b JM	264	{"", "", "", ""}, /* Binary format info */
	265	{"#o%lo", "#o", "o", ""}, /* Octal format info */
	266	{"%ld", "", "d", ""}, /* Decimal format info */
	267	{"#x%lX", "#X", "X", ""}, /* Hex format info */
c906108c SS	268	NULL, /* expression operators for printing */
	269	1, /* c-style arrays */
	270	0, /* String lower bound */
c5aa993b	271	&builtin_type_char, /* Type of string elements */
c906108c SS	272	LANG_MAGIC
	273	};
	274
	275	void
	276	_initialize_scheme_language ()
	277	{
	278	add_language (&scm_language_defn);
	279	builtin_type_scm = init_type (TYPE_CODE_INT,
	280	TARGET_LONG_BIT / TARGET_CHAR_BIT,
	281	0, "SCM", (struct objfile *) NULL);
	282	}