switch-coreboot/util/dtc/dtc-parser.y

/*
 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
 *
 * 
 * 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 
 */

%glr-parser
%locations

%{
#include "dtc.h"
int yylex (void);
void yyerror (char const *);

extern struct boot_info *the_boot_info;

%}

%union {
	cell_t cval;
	u8 byte;
	char *str;
	struct data data;
	struct property *prop;
	struct property *proplist;
	struct node *node;
	struct node *nodelist;
	int datalen;
	int hexlen;
	u64 addr;
	struct reserve_info *re;
}

%token <str> DT_MEMRESERVE
%token <addr> DT_ADDR
%token <str> DT_PROPNAME
%token <str> DT_NODENAME
%token <cval> DT_CELL
%token <byte> DT_BYTE
%token <data> DT_STRING
%token <str> DT_UNIT
%token <str> DT_LABEL
%token <str> DT_REF
%token <str> DT_FILENAME
%token <proplist> DT_CONFIG

%type <data> propdata
%type <re> memreserve
%type <re> memreserves
%type <data> celllist
%type <data> bytestring
%type <prop> propdef
%type <proplist> proplist

%type <node> devicetree
%type <node> nodedef
%type <node> subnode
%type <proplist> config
%type <nodelist> subnodes
%type <str> label
%type <str> nodename
%type <data> includepath
%type <data> structname
%%

/*sourcefile:	memreserves devicetree {*/
sourcefile:	devicetree {
/*			the_boot_info = build_boot_info($1, $2);*/
			the_boot_info = build_boot_info(0, $1);
		}
	;

memreserves:	memreserve memreserves {
			$$ = chain_reserve_entry($1, $2);
		}
	|	/* empty */	{
			$$ = NULL;
		}
	;

memreserve:	DT_MEMRESERVE DT_ADDR DT_ADDR ';' {
			$$ = build_reserve_entry($2, $3, NULL);
		}
	|	DT_MEMRESERVE DT_ADDR '-' DT_ADDR ';' {
			$$ = build_reserve_entry($2, $4 - $2 + 1, NULL);
		}
	;

devicetree:	'/' nodedef {
			$$ = name_node($2, "", NULL);
		}
	;

nodedef:	'{' config proplist subnodes '}' ';' {
			$$ = build_node($2, $3, $4);
		}
	;

proplist:	propdef proplist {
			$$ = chain_property($1, $2);
		}
	|	/* empty */	{
			$$ = NULL;
		}
	;

config:        DT_CONFIG '(' 
		includepath {
			void switchin(FILE *f);
			FILE *f;
			/* The need for a cast here is silly */
			char *name = (char *)$3.val;

			/* TODO: keep track of which of these we have read in. If we have already done it, then 
			  * don't do it twice. 
			  */
			f  = fopenfile(name);
			if (! f){
				perror(name);
				exit(1);
			}
			switchin(f);
		}  '{' proplist '}' ';' {
			void	switchback(void);
			switchback();
			
		}
		')' ';' {
				int namelen;
				char *name = strdup((char *)$3.val);
				/* convention: first property is labeled with path */
				$6->label = name;

				/* convention: if it ends in .dts, strip that off	*/
				namelen = strlen($6->label);
				if ((namelen > 4) && (! strncmp(&name[namelen-4], ".dts", 4)))
					$6->label[namelen-4] = '\0';

				$$ = $6;
			}
	|
	;

includepath:	DT_STRING  { $$ = $1; }
	;

structname: 	DT_FILENAME {$$ = $1; }
	;

propdef:	label DT_PROPNAME '=' propdata ';' {
			$$ = build_property($2, $4, $1);
		}
	|	label DT_PROPNAME ';' {
			$$ = build_property($2, empty_data, $1);
		}
	;

propdata:	DT_STRING { $$ = $1; }
	|	'<' celllist '>' { $$ = $2; }
	|	'[' bytestring ']' { $$ = $2; }
	;

celllist:	celllist DT_CELL { $$ = data_append_cell($1, $2); }
	|	celllist DT_REF	{
			$$ = data_append_cell(data_add_fixup($1, $2), -1);
		}
	|	/* empty */ { $$ = empty_data; }
	;

bytestring:	bytestring DT_BYTE { $$ = data_append_byte($1, $2); }
	|	/* empty */ { $$ = empty_data; }
	;

subnodes:	subnode subnodes {
			$$ = chain_node($1, $2);
		}
	|	/* empty */ { $$ = NULL; }
	;

subnode:	label nodename nodedef { $$ = name_node($3, $2, $1); }
	;

nodename:	DT_NODENAME	{ $$ = $1; }
	|	DT_PROPNAME	{ $$ = $1; }
	;

label:		DT_LABEL	{ $$ = $1; }
	|	/* empty */	{ $$ = NULL; }
	;

%%

void yyerror (char const *s)
{
	fprintf (stderr, "%s at line %d\n", s, yylloc.first_line);
}