MultiSource/Benchmarks/MallocBench/gs/zgeneric.c

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/* zgeneric.c */
/* Array/string/dictionary generic operators for PostScript */
#include "memory_.h"
#include "ghost.h"
#include "errors.h"
#include "oper.h"
#include "dict.h"
#include "estack.h"	/* for forall */
#include "store.h"

/* This file implements copy, get, put, getinterval, putinterval, */
/* length, and forall, which apply generically to */
/* arrays, strings, and dictionaries.  (Copy also has a special */
/* meaning for copying the top N elements of the stack.) */

/* Forward references */
private int copy_interval(P3(ref *, uint, ref*));

/* copy */
/* Note that this implements copy for arrays and strings, */
/* but not for dictionaries (see zcopy_dict in zdict.c). */
int
zcopy(register ref *op)
{	int code;
	switch ( r_type(op) )
	   {
	case t_integer:
	   {	int count;
		if ( (ulong)op->value.intval > op - osbot )
			return e_rangecheck;
		count = op->value.intval;
		if ( op - 1 + count > ostop )
			return e_stackoverflow;
		memcpy((char *)op, (char *)(op - count), count * sizeof(ref));
		push(count - 1);
		return 0;
	   }
	case t_array:
	case t_packedarray:
	case t_string:
		code = copy_interval(op, 0, op - 1);
		break;
	case t_dictionary:
		return zcopy_dict(op);
	default:
		return e_typecheck;
	   }
	if ( code ) return code;	/* error */
	op->size = op[-1].size;
	op[-1] = *op;
	r_set_attrs(op - 1, a_subrange);
	pop(1);
	return 0;
}

/* length */
int
zlength(register ref *op)
{	switch ( r_type(op) )
	   {
	case t_array:
	case t_packedarray:
	case t_string:
		check_read(*op);
		make_int(op, op->size);
		return 0;
	case t_dictionary:
		check_dict_read(*op);
		make_int(op, dict_length(op));
		return 0;
	case t_name:
	   {	/* The PostScript manual doesn't allow length on names, */
		/* but the implementations apparently do. */
		ref str;
		name_string_ref(op, &str);
		make_int(op, str.size);
	   }
		return 0;
	default:
		return e_typecheck;
	   }
}

/* get */
int
zget(register ref *op)
{	ref *op1 = op - 1;
	ref *pvalue;
	switch ( r_type(op1) )
	   {
	case t_dictionary:
		check_dict_read(*op1);
		if ( dict_find(op1, op, &pvalue) <= 0 ) return e_undefined;
		break;
	case t_array:
	case t_packedarray:
		check_type(*op, t_integer);
		check_read(*op1);
		if ( (ulong)(op->value.intval) >= op1->size )
			return e_rangecheck;
		pvalue = op1->value.refs + (uint)op->value.intval;
		break;
	case t_string:
		check_type(*op, t_integer);
		check_read(*op1);
		if ( (ulong)(op->value.intval) >= op1->size )
			return e_rangecheck;
	   {	int element = op1->value.bytes[(uint)op->value.intval];
		make_int(op1, element);
		pop(1);
	   }
		return 0;
	default:
		return e_typecheck;
	   }
	op[-1] = *pvalue;
	pop(1);
	return 0;
}

/* put */
int
zput(register ref *op)
{	ref *op1 = op - 1;
	ref *op2 = op1 - 1;
	switch ( r_type(op2) )
	   {
	case t_dictionary:
		check_dict_write(*op2);
	   {	int code = dict_put(op2, op1, op);
		if ( code ) return code;	/* error */
	   }
		break;
	case t_array:
		check_type(*op1, t_integer);
		check_write(*op2);
		if ( op1->value.intval < 0 || op1->value.intval >= op2->size )
			return e_rangecheck;
		store_i(op2->value.refs + (uint)op1->value.intval, op);
		break;
	case t_packedarray:		/* packed arrays are read-only */
		return e_invalidaccess;
	case t_string:
		check_type(*op1, t_integer);
		check_write(*op2);
		if ( op1->value.intval < 0 || op1->value.intval >= op2->size )
			return e_rangecheck;
		check_type(*op, t_integer);
		if ( (ulong)op->value.intval > 0xff )
			return e_rangecheck;
		op2->value.bytes[(uint)op1->value.intval] = (byte)op->value.intval;
		break;
	default:
		return e_typecheck;
	   }
	pop(3);
	return 0;
}

/* getinterval */
int
zgetinterval(register ref *op)
{	ref *op1 = op - 1;
	ref *op2 = op1 - 1;
	uint index;
	uint count;
	check_type(*op1, t_integer);
	check_type(*op, t_integer);
	switch ( r_type(op2) )
	   {
	default: return e_typecheck;
	case t_array: case t_packedarray: case t_string: ;
	   }
	check_read(*op2);
	if ( (ulong)op1->value.intval > op2->size ) return e_rangecheck;
	index = op1->value.intval;
	if ( (ulong)op->value.intval > op2->size - index ) return e_rangecheck;
	count = op->value.intval;
	switch ( r_type(op2) )
	   {
	case t_array:
	case t_packedarray: op2->value.refs += index; break;
	case t_string: op2->value.bytes += index; break;
	   }
	op2->size = count;
	r_set_attrs(op2, a_subrange);
	pop(2);
	return 0;
}

/* putinterval */
int
zputinterval(register ref *op)
{	ref *opindex = op - 1;
	ref *opto = opindex - 1;
	int code;
	check_type(*opindex, t_integer);
	switch ( r_type(opto) )
	   {
	default: return e_typecheck;
	case t_packedarray: return e_invalidaccess;
	case t_array: case t_string: ;
	   }
	check_write(*opto);
	if ( (ulong)opindex->value.intval > opto->size ) return e_rangecheck;
	code = copy_interval(opto, (uint)(opindex->value.intval), op);
	if ( code >= 0 ) pop(3);
	return 0;
}

/* forall */
private int
  array_continue(P1(ref *)),
  string_continue(P1(ref *)),
  dict_continue(P1(ref *));
int
zforall(register ref *op)
{	int (*cproc)(P1(ref *));
	ref *obj = op - 1;
	uint index;
	switch ( r_type(obj) )
	   {
	default:
		return e_typecheck;
	case t_array:
	case t_packedarray:
		check_read(*obj);
		cproc = array_continue;
		index = 0;		/* not used */
		break;
	case t_string:
		check_read(*obj);
		cproc = string_continue;
		index = 0;		/* not used */
		break;
	case t_dictionary:
		check_dict_read(*obj);
		cproc = dict_continue;
		index = dict_first(obj);
		break;
	   }
	/* Push a mark, the composite object, the iteration index, */
	/* and the procedure, and invoke the continuation operator. */
	check_estack(6);
	mark_estack(es_for);
	*++esp = *obj;
	++esp;
	make_int(esp, index);
	*++esp = *op;
	pop(2);  op -= 2;
	return (*cproc)(op);
}
/* Continuation operator for arrays */
private int
array_continue(register ref *op)
{	ref *obj = esp - 2;
	if ( obj->size-- )		/* continue */
	   {	push(1);
		*op = *obj->value.refs;
		obj->value.refs++;
		push_op_estack(array_continue);	/* push continuation */
		*++esp = obj[2];
	   }
	else				/* done */
	   {	esp -= 4;		/* pop mark, object, index, proc */
	   }
	return o_check_estack;
}
/* Continuation operator for strings */
private int
string_continue(register ref *op)
{	ref *obj = esp - 2;
	if ( obj->size-- )		/* continue */
	   {	push(1);
		make_int(op, *obj->value.bytes);
		obj->value.bytes++;
		push_op_estack(string_continue);	/* push continuation */
		*++esp = obj[2];
	   }
	else				/* done */
	   {	esp -= 4;		/* pop mark, object, index, proc */
	   }
	return o_check_estack;
}
/* Continuation operator for dictionaries */
private int
dict_continue(register ref *op)
{	ref *obj = esp - 2;
	int index = (int)esp[-1].value.intval;
	push(2);			/* make room for key and value */
	if ( (index = dict_next(obj, index, op - 1)) >= 0 )	/* continue */
	   {	esp[-1].value.intval = index;
		push_op_estack(dict_continue);	/* push continuation */
		*++esp = obj[2];
	   }
	else				/* done */
	   {	pop(2);			/* undo push */
		esp -= 4;		/* pop mark, object, index, proc */
	   }
	return o_check_estack;
}

/* ------ Initialization procedure ------ */

void
zgeneric_op_init()
{	static op_def my_defs[] = {
		{"1copy", zcopy},
		{"2forall", zforall},
		{"2get", zget},
		{"3getinterval", zgetinterval},
		{"1length", zlength},
		{"3put", zput},
		{"3putinterval", zputinterval},
		op_def_end
	};
	z_op_init(my_defs);
}

/* ------ Shared routines ------ */

/* Copy an interval from one operand to another. */
/* This is used by both putinterval and string/array copy. */
/* One operand is known to be an array or string, */
/* and the starting index is known to be less than or equal to */
/* its length; nothing else has been checked. */
private int
copy_interval(ref *prto, uint index, ref *prfrom)
{	if ( r_type(prfrom) != r_type(prto) ) return e_typecheck;
	check_read(*prfrom);
	check_write(*prto);
	if ( prfrom->size > prto->size - index ) return e_rangecheck;
	switch ( r_type(prto) )
	   {
	case t_array:
	case t_packedarray:
		refcpy(prto->value.refs + index, prfrom->value.refs, prfrom->size);
		break;
	case t_string:
		memcpy(prto->value.bytes + index, prfrom->value.bytes, prfrom->size);
	   }
	return 0;
}