shithub: rgbds

ref: 77546e9c58436a23ebc0d4489af114592ca41390
dir: /src/link/parser.y/

/*
 * Copyright (C) 2017 Antonio Nino Diaz <[email protected]>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

%{
#include <stdio.h>

#include "extern/err.h"
#include "link/script.h"

int yylex();
void yyerror(char *);

static int nline = 1;
%}

%union { int i; char s[512]; }

%token<i> INTEGER
%token<s> STRING

%token<s> SECTION_NONBANKED
%token<s> SECTION_BANKED

%token COMMAND_ALIGN
%token COMMAND_ORG

%token NEWLINE

%start lines

%%

lines:
	  /* empty */
	| lines line NEWLINE
	;

line:
	  /* empty */	   { nline++; }
	| statement		 { nline++; }
	;

statement:
	/* Statements to set the current section */
	  SECTION_NONBANKED {
		script_SetCurrentSectionType($1, 0);
	}
	| SECTION_NONBANKED INTEGER {
		errx(1, "%d:Trying to assign a bank to a non-banked section.\n", nline);
	}

	| SECTION_BANKED {
		errx(1, "%d:Banked section without assigned bank.\n", nline);
	}
	| SECTION_BANKED INTEGER {
		script_SetCurrentSectionType($1, $2);
	}

	/* Commands to adjust the address inside the current section */
	| COMMAND_ALIGN INTEGER {
		script_SetAlignment($2);
	}
	| COMMAND_ALIGN {
		errx(1, "%d:ALIGN keyword needs an argument.\n", nline);
	}
	| COMMAND_ORG INTEGER {
		script_SetAddress($2);
	}
	| COMMAND_ORG {
		errx(1, "%d:ORG keyword needs an argument.\n", nline);
	}

	/* Section name */
	| STRING {
		script_OutputSection($1);
	}

	/* End */
	;

%%

extern int yylex();
extern int yyparse();

extern FILE *yyin;

int yywrap (void)
{
	return 1;
}

void yyerror(char *s)
{
	errx(1, "%d:Linkerscript parse error: \"%s\"\n", nline, s);
}

void script_Parse(const char *path)
{
	script_InitSections();

	FILE *f = fopen(path, "r");

	if (!f)
		errx(1, "Error opening file! \"%s\"\n", path);

	yyin = f;

	do {
		yyparse();
	} while (!feof(yyin));

	fclose(f);
}