/* Copyright (C) 1989, 1995, 1996, 1997, 1998, 1999 Aladdin Enterprises.  All rights reserved.
  
  This file is part of AFPL Ghostscript.
  
  AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  distributor accepts any responsibility for the consequences of using it, or
  for whether it serves any particular purpose or works at all, unless he or
  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
  to copy, modify and redistribute AFPL Ghostscript, but only under certain
  conditions described in the License.  Among other things, the License
  requires that the copyright notice and this notice be preserved on all
  copies.
*/

/*$Id: idebug.c,v 1.2 2000/09/19 19:00:43 lpd Exp $ */
/* Debugging support for Ghostscript interpreter */
/* This file must always be compiled with DEBUG set. */
#undef DEBUG
#define DEBUG
#include "string_.h"
#include "ghost.h"
#include "gxalloc.h"		/* for procs for getting struct type */
#include "idebug.h"		/* defines interface */
#include "idict.h"
#include "iname.h"
#include "ipacked.h"
#include "istack.h"
#include "iutil.h"
#include "ivmspace.h"
#include "opdef.h"

/* Table of type name strings */
static const char *const type_strings[] = {
    REF_TYPE_DEBUG_PRINT_STRINGS
};

/* First unassigned type index */
extern const int tx_next_index;	/* in interp.c */

/* Print a name. */
void
debug_print_name(const ref * pnref)
{
    ref sref;

    name_string_ref(pnref, &sref);
    debug_print_string(sref.value.const_bytes, r_size(&sref));
}
void
debug_print_name_index(name_index_t nidx)
{
    ref nref;

    name_index_ref(nidx, &nref);
    debug_print_name(&nref);
}

/* Print a ref. */
private void
debug_print_full_ref(const ref * pref)
{
    uint size = r_size(pref);
    ref nref;

    dprintf1("(%x)", r_type_attrs(pref));
    switch (r_type(pref)) {
	case t_array:
	    dprintf2("array(%u)0x%lx", size, (ulong) pref->value.refs);
	    break;
	case t_astruct:
	    goto strct;
	case t_boolean:
	    dprintf1("boolean %x", pref->value.boolval);
	    break;
	case t_device:
	    dprintf1("device 0x%lx", (ulong) pref->value.pdevice);
	    break;
	case t_dictionary:
	    dprintf3("dict(%u/%u)0x%lx",
		     dict_length(pref), dict_maxlength(pref),
		     (ulong) pref->value.pdict);
	    break;
	case t_file:
	    dprintf1("file 0x%lx", (ulong) pref->value.pfile);
	    break;
	case t_fontID:
	    goto strct;
	case t_integer:
	    dprintf1("int %ld", pref->value.intval);
	    break;
	case t_mark:
	    dprintf("mark");
	    break;
	case t_mixedarray:
	    dprintf2("mixed packedarray(%u)0x%lx", size,
		     (ulong) pref->value.packed);
	    break;
	case t_name:
	    dprintf2("name(0x%lx#%u)", (ulong) pref->value.pname,
		     name_index(pref));
	    debug_print_name(pref);
	    break;
	case t_null:
	    dprintf("null");
	    break;
	case t_oparray:
	    dprintf2("op_array(%u)0x%lx:", size, (ulong) pref->value.const_refs);
	    {
		const op_array_table *opt = op_index_op_array_table(size);

		name_index_ref(opt->nx_table[size - opt->base_index], &nref);
	    }
	    debug_print_name(&nref);
	    break;
	case t_operator:
	    dprintf1("op(%u", size);
	    if (size > 0 && size < op_def_count)	/* just in case */
		dprintf1(":%s", (const char *)(op_index_def(size)->oname + 1));
	    dprintf1(")0x%lx", (ulong) pref->value.opproc);
	    break;
	case t_real:
	    dprintf1("real %f", pref->value.realval);
	    break;
	case t_save:
	    dprintf1("save %lu", pref->value.saveid);
	    break;
	case t_shortarray:
	    dprintf2("short packedarray(%u)0x%lx", size,
		     (ulong) pref->value.packed);
	    break;
	case t_string:
	    dprintf2("string(%u)0x%lx", size, (ulong) pref->value.bytes);
	    break;
	case t_struct:
	  strct:{
		obj_header_t *obj = (obj_header_t *) pref->value.pstruct;
		/* HACK: We know this object was allocated with gsalloc.c. */
		gs_memory_type_ptr_t otype =
		    gs_ref_memory_procs.object_type(NULL, obj);

		dprintf2("struct %s 0x%lx",
			 (r_is_foreign(pref) ? "-foreign-" :
			  gs_struct_type_name_string(otype)),
			 (ulong) obj);
	    }
	    break;
	default:
	    dprintf1("type 0x%x", r_type(pref));
    }
}
private void
debug_print_packed_ref(const ref_packed * pref)
{
    ushort elt = *pref & packed_value_mask;
    ref nref;

    switch (*pref >> r_packed_type_shift) {
	case pt_executable_operator:
	    dprintf("<op_name>");
	    op_index_ref(elt, &nref);
	    debug_print_ref(&nref);
	    break;
	case pt_integer:
	    dprintf1("<int> %d", (int)elt + packed_min_intval);
	    break;
	case pt_literal_name:
	    dprintf("<lit_name>");
	    goto ptn;
	case pt_executable_name:
	    dprintf("<exec_name>");
	  ptn:name_index_ref(elt, &nref);
	    dprintf2("(0x%lx#%u)", (ulong) nref.value.pname, elt);
	    debug_print_name(&nref);
	    break;
	default:
	    dprintf2("<packed_%d?>0x%x", *pref >> r_packed_type_shift, elt);
    }
}
void
debug_print_ref_packed(const ref_packed *rpp)
{
    if (r_is_packed(rpp))
	debug_print_packed_ref(rpp);
    else
	debug_print_full_ref((const ref *)rpp);
    fflush(dstderr);
}
void
debug_print_ref(const ref * pref)
{
    debug_print_ref_packed((const ref_packed *)pref);
}

/* Dump one ref. */
private void print_ref_data(P1(const ref *));
void
debug_dump_one_ref(const ref * p)
{
    uint attrs = r_type_attrs(p);
    uint type = r_type(p);
    static const attr_print_mask apm[] = {
	attr_print_masks,
	{0, 0, 0}
    };
    const attr_print_mask *ap = apm;

    if (type >= tx_next_index)
	dprintf1("0x%02x?? ", type);
    else if (type >= t_next_index)
	dprintf("opr* ");
    else
	dprintf1("%s ", type_strings[type]);
    for (; ap->mask; ++ap)
	if ((attrs & ap->mask) == ap->value)
	    dputc(ap->print);
    dprintf2(" 0x%04x 0x%08lx", r_size(p), *(const ulong *)&p->value);
    print_ref_data(p);
    fflush(dstderr);
}
private void
print_ref_data(const ref *p)
{
#define BUF_SIZE 30
    byte buf[BUF_SIZE + 1];
    const byte *pchars;
    uint plen;

    if (obj_cvs(p, buf, countof(buf) - 1, &plen, &pchars) >= 0 &&
	pchars == buf &&
	((buf[plen] = 0), strcmp((char *)buf, "--nostringval--"))
	)
	dprintf1(" = %s", (char *)buf);
#undef BUF_SIZE
}

/* Dump a region of memory containing refs. */
void
debug_dump_refs(const ref * from, uint size, const char *msg)
{
    const ref *p = from;
    uint count = size;

    if (size && msg)
	dprintf2("%s at 0x%lx:\n", msg, (ulong) from);
    while (count--) {
	dprintf2("0x%lx: 0x%04x ", (ulong)p, r_type_attrs(p));
	debug_dump_one_ref(p);
	dputc('\n');
	p++;
    }
}

/* Dump a stack. */
void
debug_dump_stack(const ref_stack_t * pstack, const char *msg)
{
    uint i;
    const char *m = msg;

    for (i = ref_stack_count(pstack); i != 0;) {
	const ref *p = ref_stack_index(pstack, --i);

	if (m) {
	    dprintf2("%s at 0x%lx:\n", m, (ulong) pstack);
	    m = NULL;
	}
	dprintf2("0x%lx: 0x%02x ", (ulong)p, r_type(p));
	debug_dump_one_ref(p);
	dputc('\n');
    }
}

/* Dump an array. */
void
debug_dump_array(const ref * array)
{
    const ref_packed *pp;
    uint type = r_type(array);
    uint len;

    switch (type) {
	default:
	    dprintf2("%s at 0x%lx isn't an array.\n",
		     (type < countof(type_strings) ?
		      type_strings[type] : "????"),
		     (ulong) array);
	    return;
	case t_oparray:
	    /* This isn't really an array, but we'd like to see */
	    /* its contents anyway. */
	    debug_dump_array(array->value.const_refs);
	    return;
	case t_array:
	case t_mixedarray:
	case t_shortarray:
	    ;
    }

    /* This "packed" loop works for all array-types. */
    for (len = r_size(array), pp = array->value.packed;
	 len > 0;
	 len--, pp = packed_next(pp)) {
	ref temp;

	packed_get(pp, &temp);
	if (r_is_packed(pp)) {
	    dprintf2("0x%lx* 0x%04x ", (ulong)pp, (uint)*pp);
	    print_ref_data(&temp);
	} else {
	    dprintf2("0x%lx: 0x%02x ", (ulong)pp, r_type(&temp));
	    debug_dump_one_ref(&temp);
	}
	dputc('\n');
    }
}
