ack/lang/cem/cemcom.ansi/label.c

/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
/* $Id$ */
/*		L A B E L   H A N D L I N G		*/

#include    "parameters.h"
#include    "idf.h"
#include	"Lpars.h"
#include	"level.h"
#include	"label.h"
#include	"arith.h"
#include	"def.h"
#include	"type.h"
#include	"stack.h"
#include    "error.h"


extern char options[];

void enter_label(register struct idf *idf, int defining)
{
	/*	The identifier idf is entered as a label. If it is new,
		it is entered into the idf list with the largest possible
		scope, i.e., on the lowest possible level.
		If defining, the label comes from a label statement.
	*/
	register struct def *def = idf->id_label;

	if (def)	{
		if (defining && def->df_initialized)
			error("redeclaration of label %s", idf->id_text);
	}
	else	{
		stack_idf(idf, stack_level_of(L_LOCAL));
		def = new_def();
		def->df_sc = LABEL;
		idf->id_label = def;
		def->df_file = idf->id_file;
		def->df_line = idf->id_line;
	}
	if (def->df_address == 0)
		def->df_address = (arith) text_label();
	if (defining)
		def->df_initialized = 1;
}

void unstack_label(register struct idf *idf)
{
	/*	The scope in which the label idf occurred is left.
	*/
	if (!idf->id_label->df_initialized && !is_anon_idf(idf))
		error("label %s not defined", idf->id_text);
}