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xasm.c
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xasm.c
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/*
* $Id: xasm.c,v 1.22 2007/11/11 22:35:22 khansen Exp $
* $Log: xasm.c,v $
* Revision 1.22 2007/11/11 22:35:22 khansen
* compile on mac
*
* Revision 1.21 2007/08/19 11:18:56 khansen
* --case-insensitive option
*
* Revision 1.20 2007/08/12 18:58:12 khansen
* ability to generate pure 6502 binary (--pure-binary switch)
*
* Revision 1.19 2007/08/11 01:24:36 khansen
* includepaths support (-I option)
*
* Revision 1.18 2007/08/10 20:21:02 khansen
* *** empty log message ***
*
* Revision 1.17 2007/08/07 22:42:53 khansen
* version
*
* Revision 1.16 2007/07/22 14:49:40 khansen
* don't crash in change_extension()
*
* Revision 1.15 2007/07/22 13:33:26 khansen
* convert tabs to whitespaces
*
* Revision 1.14 2005/01/09 11:19:23 kenth
* xorcyst 1.4.5
*
* Revision 1.13 2005/01/05 09:37:32 kenth
* xorcyst 1.4.4
*
* Revision 1.12 2005/01/05 01:52:13 kenth
* xorcyst 1.4.3
*
* Revision 1.11 2005/01/04 21:35:10 kenth
* return error code from main() when error count > 0
*
* Revision 1.10 2004/12/29 21:43:50 kenth
* xorcyst 1.4.2
*
* Revision 1.9 2004/12/25 02:23:19 kenth
* xorcyst 1.4.1
*
* Revision 1.8 2004/12/19 19:58:46 kenth
* xorcyst 1.4.0
*
* Revision 1.7 2004/12/18 17:01:21 kenth
* --debug switch, multiple verbose levels
*
* Revision 1.6 2004/12/16 13:20:35 kenth
* xorcyst 1.3.5
*
* Revision 1.5 2004/12/14 01:50:12 kenth
* xorcyst 1.3.0
*
* Revision 1.4 2004/12/11 02:06:27 kenth
* xorcyst 1.2.0
*
* Revision 1.3 2004/12/06 04:53:02 kenth
* xorcyst 1.1.0
*
* Revision 1.2 2004/06/30 23:37:54 kenth
* replaced argp with something else
*
* Revision 1.1 2004/06/30 07:56:02 kenth
* Initial revision
*
*/
/**
* (C) 2004 Kent Hansen
*
* The XORcyst 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.
*
* The XORcyst 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 The XORcyst; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* The main program.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "getopt.h"
#include "astnode.h"
#include "astproc.h"
#include "symtab.h"
#include "codegen.h"
#include "xasm.h"
/*---------------------------------------------------------------------------*/
/* Parser stuff we need. */
int yyparse(void);
extern int yydebug;
extern int yynerrs;
/* Scanner stuff we need. */
int yybegin(const char *, int, int);
/* Other. */
astnode *root_node;
static symtab *symbol_table;
char *xasm_path;
/*---------------------------------------------------------------------------*/
/* Argument parsing stuff. */
static char program_version[] = "xasm 1.5.2";
/* Argument variables set by arg parser. */
xasm_arguments xasm_args;
/* Long options for getopt_long(). */
static struct option long_options[] = {
{ "define", required_argument, 0, 'D' },
{ "include-path", required_argument, 0, 'I' },
{ "output", required_argument, 0, 'o' },
{ "quiet", no_argument, 0, 'q' },
{ "silent", no_argument, 0, 's' },
{ "verbose", no_argument, 0, 'v' },
{ "debug", no_argument, 0, 'g' },
{ "help", no_argument, 0, 0 },
{ "usage", no_argument, 0, 0 },
{ "version", no_argument, 0, 'V' },
{ "swap-parens", no_argument, 0, 0 },
{ "pure-binary", no_argument, 0, 0 },
{ "case-insensitive", no_argument, 0, 0 },
{ "no-warn", no_argument, 0, 0 },
{ 0 }
};
/* Prints usage message and exits. */
static void usage()
{
printf("\
Usage: xasm [-gqsvV] [-D IDENT[=VALUE]] [--define=IDENT]\n\
[-o FILE] [--output=FILE] [--pure-binary]\n\
[--include-path=DIR] [-I DIR] [--swap-parens]\n\
[--case-insensitive]\n\
[--no-warn] [--verbose] [--quiet] [--silent] \n\
[--debug] [--help] [--usage] [--version]\n\
FILE\n\
");
exit(0);
}
/* Prints help message and exits. */
static void help()
{
printf("\
Usage: xasm [OPTION...] FILE\n\
The XORcyst Assembler -- it kicks the 6502's ass\n\
\n\
-D, --define=IDENT[=VALUE] Define IDENT\n\
-I, --include-path=DIR Specify a search path for include files\n\
-o, --output=FILE Output to FILE instead of standard output\n\
--pure-binary Output pure 6502 binary\n\
--swap-parens Use ( ) instead of [ ] for indirection\n\
--case-insensitive Case-insensitive identifiers\n\
--no-warn Suppress warnings\n\
-q, -s, --quiet, --silent Don't produce any output\n\
-v, --verbose Produce verbose output\n\
-g, --debug Retain file locations\n\
--help Give this help list\n\
--usage Give a short usage message\n\
-V, --version Print program version\n\
\n\
Mandatory or optional arguments to long options are also mandatory or optional\n\
for any corresponding short options.\n\
\n\
Report bugs to <kentmhan@gmail.com>.\n\
");
exit(0);
}
/* Prints version and exits. */
static void version()
{
printf("%s\n", program_version);
exit(0);
}
/**
* Checks if a character is alpha (a-z, A-Z).
*/
static int __isalpha(char c)
{
return ( ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')) );
}
/**
* Checks if a character is alpha (a-z, A-Z) or numeric (0-9).
*/
static int __isalnum(char c)
{
return ( __isalpha(c) || ((c >= '0') && (c <= '9')) );
}
/**
* Checks that an identifier matches the regexp [a-zA-Z_][a-zA-Z0-9_]*
* @param id Identifier to validate
* @return 1 if OK, 0 otherwise
*/
static int validate_ident(char *id)
{
int i;
char c;
c = id[0];
if ( !__isalpha(c) && (c != '_') ) {
return 0;
}
for (i=1; i<strlen(id); i++) {
c = id[i];
if ( !__isalnum(c) && (c != '_') ) {
return 0;
}
}
return 1; /* OK */
}
/* Parses program arguments. */
static void
parse_arguments (int argc, char **argv)
{
int key;
/* getopt_long stores the option index here. */
int index = 0;
/* Set default values. */
xasm_args.debug = 0;
xasm_args.silent = 0;
xasm_args.verbose = 0;
xasm_args.swap_parens = 0;
xasm_args.pure_binary = 0;
xasm_args.case_insensitive = 0;
xasm_args.input_file = NULL;
xasm_args.output_file = NULL;
xasm_args.include_paths = NULL;
xasm_args.include_path_count = 0;
/* Parse options. */
while ((key = getopt_long(argc, argv, "D:I:o:qsvV", long_options, &index)) != -1) {
switch (key) {
case 'g':
xasm_args.debug = 1;
break;
case 'q': case 's':
xasm_args.silent = 1;
break;
case 'v':
xasm_args.verbose++;
break;
case 'o':
xasm_args.output_file = optarg;
break;
case 'D': {
char *id;
char *str;
astnode *val;
static location loc = { 0, 0, 0, 0, NULL };
if (strchr(optarg, '=') != NULL) {
/* IDENT=VALUE */
id = strtok(optarg, "=");
str = strtok(NULL, "\0");
if (str) {
/* Parse the value */
if (str[0] == '\"') {
/* Assume string */
str = strtok(&str[1], "\"");
val = astnode_create_string(str, loc);
} else {
/* Assume integer */
val = astnode_create_integer(strtol(str, NULL, 0), loc);
}
} else {
/* No value given -- use empty string */
val = astnode_create_string("", loc);
}
} else {
id = optarg;
val = astnode_create_integer(0, loc);
}
if (validate_ident(id)) {
symtab_entry *e;
e = symtab_lookup(id);
if (e == NULL) {
symtab_enter(id, CONSTANT_SYMBOL, val, 0);
} else {
/* Error, redefinition */
fprintf(stderr, "--ident: `%s' already defined\n", id);
}
} else {
/* Error, bad identifier */
fprintf(stderr, "--ident: `%s' is not a valid identifier\n", id);
}
}
break;
case 'I': {
char *p;
int count = xasm_args.include_path_count + 1;
xasm_args.include_paths = (char **)realloc(
xasm_args.include_paths, sizeof(const char *) * count);
p = (char *)malloc(strlen(optarg) + 1);
strcpy(p, optarg);
xasm_args.include_paths[count-1] = p;
xasm_args.include_path_count = count;
}
break;
case 0:
/* Use index to differentiate between options */
if (strcmp(long_options[index].name, "usage") == 0) {
usage();
} else if (strcmp(long_options[index].name, "help") == 0) {
help();
} else if (strcmp(long_options[index].name, "swap-parens") == 0) {
xasm_args.swap_parens = 1;
} else if (strcmp(long_options[index].name, "pure-binary") == 0) {
xasm_args.pure_binary = 1;
} else if (strcmp(long_options[index].name, "case-insensitive") == 0) {
xasm_args.case_insensitive = 1;
} else if (strcmp(long_options[index].name, "no-warn") == 0) {
xasm_args.no_warn = 1;
}
break;
case 'V':
version();
break;
case '?':
/* Error message has been printed by getopt_long */
exit(1);
break;
default:
/* Forgot to handle a short option, most likely */
fprintf(stderr, "internal error: unhandled option `%c'\n", key);
exit(1);
break;
}
}
/* Must be one additional argument, which is the input file. */
if (argc-1 != optind) {
printf("Usage: xasm [OPTION...] FILE\nTry `xasm --help' or `xasm --usage' for more information.\n");
exit(1);
}
else {
xasm_args.input_file = argv[optind];
}
}
/*---------------------------------------------------------------------------*/
/**
* Changes the extension of a filename.
* @param infile Filename whose extension to change
* @param ext New extension
* @param outfile Destination filename
*/
static void change_extension(const char *infile, const char *ext, char *outfile)
{
char *p;
/* Find the last dot. */
p = strrchr(infile, '.');
if (p == NULL) {
/* There is no dot, simply concatenate extension. */
sprintf(outfile, "%s.%s", infile, ext);
}
else {
/* Copy the name up to and including the last dot */
strncpy(outfile, infile, p - infile + 1);
outfile[p - infile + 1] = '\0';
/* Then concatenate the extension. */
strcat(outfile, ext);
}
}
/*---------------------------------------------------------------------------*/
/**
* Prints message only if --verbose option was given to assembler.
*/
static void verbose(const char *s)
{
if (xasm_args.verbose) {
printf("%s\n", s);
}
}
/**
* Gets total number of errors (parsing + semantics).
*/
static int total_errors()
{
return yynerrs + astproc_err_count();
}
/**
* Program entrypoint.
*/
int main(int argc, char *argv[]) {
FILE *output_fp;
char *default_outfile = 0;
/* Working directory is needed for include statements */
xasm_path = getcwd(NULL, 0);
/* Create global symbol table (auto-pushed on stack) */
symbol_table = symtab_create();
/* Parse our arguments. */
parse_arguments (argc, argv);
/* Open input for scanning */
if (!yybegin(xasm_args.input_file,
xasm_args.swap_parens,
xasm_args.case_insensitive)) {
fprintf(stderr, "error: could not open `%s' for reading\n", xasm_args.input_file);
symtab_finalize(symbol_table);
return(1);
}
/* Parse it into a syntax tree */
//yydebug = -1;
verbose("Parsing input...");
yyparse();
if (root_node == NULL) {
symtab_finalize(symbol_table);
return(0);
}
/* First pass does a lot of stuff. */
verbose("First pass...");
astproc_first_pass(root_node);
/* Second pass does more stuff. */
verbose("Second pass...");
astproc_second_pass(root_node);
/* Third pass is fun. */
verbose("Third pass...");
astproc_third_pass(root_node);
if (xasm_args.pure_binary) {
/* Do another pass to prepare for writing pure 6502 */
verbose("Fourth pass...");
astproc_fourth_pass(root_node);
}
/* Print the final AST (debugging) */
// astnode_print(root_node, 0);
/* If no errors, proceed with code generation. */
if (total_errors() == 0) {
if (xasm_args.output_file == NULL) {
/* Create default name of output */
const char *default_ext = "o";
int default_outfile_len = strlen(xasm_args.input_file)
+ /*dot*/1 + strlen(default_ext) + 1;
default_outfile = (char *)malloc(default_outfile_len);
change_extension(xasm_args.input_file, default_ext, default_outfile);
xasm_args.output_file = default_outfile;
}
/* Attempt to open file for writing */
output_fp = fopen(xasm_args.output_file, "wb");
if (output_fp == NULL) {
fprintf(stderr, "error: could not open `%s' for writing\n", xasm_args.output_file);
} else {
verbose("Generating final output...");
if (xasm_args.pure_binary) {
astproc_fifth_pass(root_node, output_fp);
} else {
codegen_write(root_node, output_fp);
}
fclose(output_fp);
}
}
/* Cleanup */
verbose("cleaning up...");
symtab_pop();
symtab_finalize(symbol_table);
astnode_finalize(root_node);
if (default_outfile)
free(default_outfile);
if (xasm_args.include_path_count > 0) {
int i;
for (i = 0; i < xasm_args.include_path_count; ++i)
free(xasm_args.include_paths[i]);
free(xasm_args.include_paths);
}
free(xasm_path);
return (total_errors() == 0) ? 0 : 1;
}