/* -*-C-*-

$Id: comutl.c,v 1.39 2007/06/06 19:42:40 cph Exp $

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme 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.

MIT/GNU Scheme 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 MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

*/

/* Compiled Code Utilities */

#include "scheme.h"
#include "osscheme.h"
#include "prims.h"

#ifdef CC_IS_C
extern unsigned long liarc_n_compiled_blocks (void);
extern void get_liarc_compiled_block_data
  (unsigned long, const char **, void **, void **, void **);
#endif

DEFINE_PRIMITIVE ("COMPILED-CODE-ADDRESS->BLOCK", Prim_comp_code_address_block,
		  1, 1, "(ADDRESS)\n\
Given a compiled-code entry ADDRESS, return its block.")
{
  PRIMITIVE_HEADER (1);
  CHECK_ARG (1, CC_ENTRY_P);
  PRIMITIVE_RETURN (cc_entry_to_block (ARG_REF (1)));
}

DEFINE_PRIMITIVE ("COMPILED-CODE-ADDRESS->OFFSET",
		  Prim_comp_code_address_offset, 1, 1, "(ADDRESS)\n\
Given a compiled-code entry ADDRESS, return its offset into its block.")
{
  PRIMITIVE_HEADER (1);
  CHECK_ARG (1, CC_ENTRY_P);
  PRIMITIVE_RETURN (ULONG_TO_FIXNUM (cc_entry_to_block_offset (ARG_REF (1))));
}

DEFINE_PRIMITIVE ("STACK-TOP-ADDRESS", Prim_stack_top_address, 0, 0, 0)
{
  PRIMITIVE_HEADER (0);
  PRIMITIVE_RETURN (ulong_to_integer (ADDRESS_TO_DATUM (STACK_BOTTOM)));
}

DEFINE_PRIMITIVE ("STACK-ADDRESS-OFFSET", Prim_stack_address_offset, 1, 1, 0)
{
  PRIMITIVE_HEADER (1);

  CHECK_ARG (1, CC_STACK_ENV_P);
  {
    SCHEME_OBJECT * address = (OBJECT_ADDRESS (ARG_REF (1)));
    if (!ADDRESS_IN_STACK_P (address))
      error_bad_range_arg (1);
    PRIMITIVE_RETURN
      (ulong_to_integer (SP_TO_N_PUSHED (address, stack_start, stack_end)));
  }
}

DEFINE_PRIMITIVE ("COMPILED-ENTRY-KIND", Prim_compiled_entry_kind, 1, 1, 0)
{
  PRIMITIVE_HEADER (1);
  CHECK_ARG (1, CC_ENTRY_P);
  {
    cc_entry_type_t cet;
    unsigned long kind = 4;
    unsigned long field1 = 0;
    long field2 = 0;

    if (!read_cc_entry_type ((&cet), (CC_ENTRY_ADDRESS (ARG_REF (1)))))
      switch (cet.marker)
	{
	case CET_PROCEDURE:
	  kind = 0;
	  field1 = (1 + (cet.args.for_procedure.n_required));
	  field2 = (field1 + (cet.args.for_procedure.n_optional));
	  if (cet.args.for_procedure.rest_p)
	    field2 = (- (field2 + 1));
	  break;

	case CET_CONTINUATION:
	  kind = 1;
	  field1 = 0;
	  field2 = (cet.args.for_continuation.offset);
	  break;

	case CET_EXPRESSION:
	  kind = 2;
	  field1 = 0;
	  field2 = 0;
	  break;

	case CET_INTERNAL_CONTINUATION:
	  kind = 1;
	  field1 = 1;
	  field2 = (-1);
	  break;

	case CET_INTERNAL_PROCEDURE:
	case CET_TRAMPOLINE:
	  kind = 3;
	  field1 = 1;
	  field2 = 0;
	  break;

	case CET_RETURN_TO_INTERPRETER:
	  kind = 1;
	  field1 = 2;
	  field2 = ((ARG_REF (1)) != return_to_interpreter);
	  break;

	case CET_CLOSURE:
	  kind = 3;
	  field1 = 0;
	  field2 = 0;
	  break;
	}
    PRIMITIVE_RETURN
      (hunk3_cons ((ULONG_TO_FIXNUM (kind)),
		   (ULONG_TO_FIXNUM (field1)),
		   (LONG_TO_FIXNUM (field2))));
  }
}

DEFINE_PRIMITIVE ("COERCE-TO-COMPILED-PROCEDURE", Prim_coerce_to_closure, 2, 2,
		  0)
{
  PRIMITIVE_HEADER (2);
  {
    SCHEME_OBJECT temp;
    long result
      = (coerce_to_compiled ((ARG_REF (1)), (arg_ulong_integer (2)), (&temp)));
    switch (result)
      {
      case PRIM_DONE:
	break;

      case PRIM_INTERRUPT:
	Primitive_GC (10);
	/*NOTREACHED*/
	break;

      default:
	error_bad_range_arg (2);
	/*NOTREACHED*/
	break;
      }
    PRIMITIVE_RETURN (temp);
  }
}

DEFINE_PRIMITIVE ("COMPILED-CLOSURE->ENTRY", Prim_cc_closure_to_entry, 1, 1,
  "Given a compiled closure, return the entry point which it invokes.")
{
  PRIMITIVE_HEADER (1);
  CHECK_ARG (1, CC_ENTRY_P);
  if (!cc_entry_closure_p (ARG_REF (1)))
    error_bad_range_arg (1);
  PRIMITIVE_RETURN (cc_closure_to_entry (ARG_REF (1)));
}

DEFINE_PRIMITIVE ("UTILITY-INDEX->NAME", Prim_utility_index_to_name, 1, 1, 0)
{
  PRIMITIVE_HEADER (1);
  {
    const char * name = (utility_index_to_name (arg_ulong_integer (1)));
    PRIMITIVE_RETURN ((name == 0) ? SHARP_F : (char_pointer_to_string (name)));
  }
}

DEFINE_PRIMITIVE ("BUILTIN-INDEX->NAME", Prim_builtin_index_to_name, 1, 1, 0)
{
  PRIMITIVE_HEADER (1);
  {
    const char * name = (builtin_index_to_name (arg_ulong_integer (1)));
    PRIMITIVE_RETURN ((name == 0) ? SHARP_F : (char_pointer_to_string (name)));
  }
}

DEFINE_PRIMITIVE ("INITIALIZE-C-COMPILED-BLOCK",
		  Prim_initialize_C_compiled_block, 1, 1,
  "Given the tag of a compiled object, return the object.")
{
  PRIMITIVE_HEADER (1);
#ifdef CC_IS_C
  PRIMITIVE_RETURN (initialize_C_compiled_block (STRING_ARG (1)));
#else
  PRIMITIVE_RETURN (SHARP_F);
#endif
}

typedef unsigned long thunk_t (void);
static const char * ilof_prefix = 0;

DEFINE_PRIMITIVE ("INITIALIZE-LIARC-OBJECT-FILE", Prim_initialize_liarc_object_file, 2, 2,
		  "(ADDRESS PREFIX)\n\
Run the object-file initialization thunk specified by ADDRESS,\n\
using PREFIX as the rewriting prefix for the subparts.")
{
  PRIMITIVE_HEADER (2);
  {
    thunk_t * thunk = ((thunk_t *) (arg_ulong_integer (1)));
    const char * prefix = (STRING_ARG (2));
    void * p = dstack_position;
    dstack_bind ((&ilof_prefix), ((void *) prefix));
    {
      unsigned long value = ((*thunk) ());
      dstack_set_position (p);
      PRIMITIVE_RETURN (ulong_to_integer (value));
    }
  }
}

const char *
liarc_object_file_prefix (void)
{
  return (ilof_prefix);
}


DEFINE_PRIMITIVE ("DECLARE-COMPILED-CODE-BLOCK",
		  Prim_declare_compiled_code_block, 1, 1,
  "Ensure cache coherence for a compiled-code block newly constructed.")
{
  PRIMITIVE_HEADER (1);
  {
    SCHEME_OBJECT new_cc_block = (ARG_REF (1));
    if (!CC_BLOCK_P (new_cc_block))
      error_wrong_type_arg (1);
    declare_compiled_code_block (new_cc_block);
    PRIMITIVE_RETURN (SHARP_T);
  }
}

DEFINE_PRIMITIVE ("LIARC-COMPILED-BLOCKS", Prim_liarc_compiled_code_blocks,
		  0, 0,
  "Return a vector containing the names of registered compiled-code blocks.")
{
  PRIMITIVE_HEADER (0);
#ifdef CC_IS_C
  {
    unsigned long n = (liarc_n_compiled_blocks ());
    SCHEME_OBJECT v = (allocate_marked_vector (TC_VECTOR, n, true));
    unsigned long i;
    const char * name;
    void * code_proc;
    void * data_proc;
    void * object_proc;

    for (i = 0; (i < n); i += 1)
      VECTOR_SET (v, i, (allocate_marked_vector (TC_VECTOR, 4, true)));

    for (i = 0; (i < n); i += 1)
      {
	SCHEME_OBJECT vi = (VECTOR_REF (v, i));
	get_liarc_compiled_block_data
	  (i, (&name), (&code_proc), (&data_proc), (&object_proc));
	VECTOR_SET (vi, 0, (char_pointer_to_string (name)));
	VECTOR_SET (vi, 1,
		    ((code_proc == 0)
		     ? SHARP_F
		     : (ulong_to_integer ((unsigned long) code_proc))));
	VECTOR_SET (vi, 2,
		    ((data_proc == 0)
		     ? SHARP_F
		     : (ulong_to_integer ((unsigned long) data_proc))));
	VECTOR_SET (vi, 3,
		    ((object_proc == 0)
		     ? SHARP_F
		     : (ulong_to_integer ((unsigned long) object_proc))));
      }

    PRIMITIVE_RETURN (v);
  }
#else
  error_unimplemented_primitive ();
  PRIMITIVE_RETURN (UNSPECIFIC);
#endif
}

DEFINE_PRIMITIVE ("BKPT/INSTALL", Prim_install_bkpt, 1, 1,
		  "(compiled-entry-object)\n\
Install a breakpoint trap in a compiled code object.\n\
Returns false or a handled needed by REMOVE-BKPT and ONE-STEP-PROCEED.")
{
  PRIMITIVE_HEADER (1);
  CHECK_ARG (1, CC_ENTRY_P);

  {
    SCHEME_OBJECT * entry = (OBJECT_ADDRESS (ARG_REF (1)));
    SCHEME_OBJECT * block;

    if (bkpt_p ((void *) entry))
      error_bad_range_arg (1);

    block = (cc_entry_to_block_address (ARG_REF (1)));
    if ((OBJECT_TYPE (block[0])) == TC_MANIFEST_CLOSURE)
      PRIMITIVE_RETURN (bkpt_closure_install ((void *) entry));
    else
      PRIMITIVE_RETURN (bkpt_install ((void *) entry));
  }
}

DEFINE_PRIMITIVE ("BKPT/REMOVE", Prim_remove_bkpt, 2, 2,
		  "(compiled-entry-object handle)\n\
Remove a breakpoint trap installed by INSTALL-BKPT.")
{
  PRIMITIVE_HEADER (2);
  CHECK_ARG (1, CC_ENTRY_P);
  CHECK_ARG (2, NON_MARKED_VECTOR_P);

  {
    SCHEME_OBJECT * entry = (OBJECT_ADDRESS (ARG_REF (1)));
    SCHEME_OBJECT handle = (ARG_REF (2));

    if (! (bkpt_p ((void *) entry)))
      error_bad_range_arg (1);
    bkpt_remove (((void *) entry), handle);
    PRIMITIVE_RETURN (UNSPECIFIC);
  }
}

DEFINE_PRIMITIVE ("BKPT?", Prim_bkpt_p, 1, 1,
		  "(compiled-entry-object)\n\
True if there is a breakpoint trap in compiled-entry-object.")
{
  PRIMITIVE_HEADER (1);
  CHECK_ARG (1, CC_ENTRY_P);

  PRIMITIVE_RETURN (BOOLEAN_TO_OBJECT
		    (bkpt_p ((void *) (OBJECT_ADDRESS (ARG_REF (1))))));
}

DEFINE_PRIMITIVE ("BKPT/PROCEED", Prim_bkpt_proceed, 3, 3,
		  "(compiled-entry-object handle state)\n\
Proceed the computation from the current breakpoint.")
{
  PRIMITIVE_HEADER (3);
  CHECK_ARG (1, CC_ENTRY_P);
  CHECK_ARG (2, NON_MARKED_VECTOR_P);

  PRIMITIVE_RETURN (bkpt_proceed (((void *) (OBJECT_ADDRESS (ARG_REF (1)))),
				  (ARG_REF (2)),
				  (ARG_REF (3))));
}
