drivers/scsi/aic7xxx/aicasm/aicasm_scan.l - third_party/linux - Git at Google

 %{
 /*
  * Lexical Analyzer for the Aic7xxx SCSI Host adapter sequencer assembler.
  *
  * Copyright (c) 1997, 1998, 2000 Justin T. Gibbs.
  * Copyright (c) 2001, 2002 Adaptec Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions, and the following disclaimer,
  *    without modification.
  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  *    substantially similar to the "NO WARRANTY" disclaimer below
  *    ("Disclaimer") and any redistribution must be conditioned upon
  *    including a substantially similar Disclaimer requirement for further
  *    binary redistribution.
  * 3. Neither the names of the above-listed copyright holders nor the names
  *    of any contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * Alternatively, this software may be distributed under the terms of the
  * GNU General Public License ("GPL") version 2 as published by the Free
  * Software Foundation.
  *
  * NO WARRANTY
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  *
  * $Id: //depot/aic7xxx/aic7xxx/aicasm/aicasm_scan.l#20 $
  *
  * $FreeBSD$
  */

 #include <sys/types.h>

 #include <inttypes.h>
 #include <limits.h>
 #include <regex.h>
 #include <stdio.h>
 #include <string.h>
 #include <sysexits.h>
 #ifdef __linux__
 #include "../queue.h"
 #else
 #include <sys/queue.h>
 #endif

 #include "aicasm.h"
 #include "aicasm_symbol.h"
 #include "aicasm_gram.h"

 /* This is used for macro body capture too, so err on the large size. */
 #define MAX_STR_CONST 4096
 static char string_buf[MAX_STR_CONST];
 static char *string_buf_ptr;
 static int  parren_count;
 static int  quote_count;
 static char buf[255];
 %}

 PATH		([/]*[-A-Za-z0-9_.])+
 WORD		[A-Za-z_][-A-Za-z_0-9]*
 SPACE		[ \t]+
 MCARG		[^(), \t]+
 MBODY		((\\[^\n])*[^\n\\]*)+

 %x COMMENT
 %x CEXPR
 %x INCLUDE
 %x STRING
 %x MACRODEF
 %x MACROARGLIST
 %x MACROCALLARGS
 %x MACROBODY

 %%
 \n			{ ++yylineno; }
 \r			;
 "/*"			{ BEGIN COMMENT;  /* Enter comment eating state */ }
 <COMMENT>"/*"		{ fprintf(stderr, "Warning! Comment within comment."); }
 <COMMENT>\n		{ ++yylineno; }
 <COMMENT>[^*/\n]*	;
 <COMMENT>"*"+[^*/\n]*	;
 <COMMENT>"/"+[^*/\n]*	;
 <COMMENT>"*"+"/"	{ BEGIN INITIAL; }
 if[ \t]*\(		{
 				string_buf_ptr = string_buf;
 				parren_count = 1;
 				BEGIN CEXPR;
 				return T_IF;
 			}
 <CEXPR>\(		{	*string_buf_ptr++ = '('; parren_count++; }
 <CEXPR>\)		{
 				parren_count--;
 				if (parren_count == 0) {
 					/* All done */
 					BEGIN INITIAL;
 					*string_buf_ptr = '\0';
 					yylval.sym = symtable_get(string_buf);
 					return T_CEXPR;
 				} else {
 					*string_buf_ptr++ = ')';
 				}
 			}
 <CEXPR>\n		{ ++yylineno; }
 <CEXPR>\r		;
 <CEXPR>[^()\n]+	{
 				char *yptr;

 				yptr = yytext;
 				while (*yptr != '\0') {
 					/* Remove duplicate spaces */
 					if (*yptr == '\t')
 						*yptr = ' ';
 					if (*yptr == ' '
 					 && string_buf_ptr != string_buf
 					 && string_buf_ptr[-1] == ' ')
 						yptr++;
 					else
 						*string_buf_ptr++ = *yptr++;
 				}
 			}
 else			{ return T_ELSE; }
 VERSION			{ return T_VERSION; }
 PREFIX			{ return T_PREFIX; }
 PATCH_ARG_LIST		{ return T_PATCH_ARG_LIST; }
 \"			{
 				string_buf_ptr = string_buf;
 				BEGIN STRING;
 			}
 <STRING>[^"]+		{
 				char *yptr;

 				yptr = yytext;
 				while (*yptr)
 					*string_buf_ptr++ = *yptr++;
 			}
 <STRING>\"		{
 				/* All done */
 				BEGIN INITIAL;
 				*string_buf_ptr = '\0';
 				yylval.str = string_buf;
 				return T_STRING;
 			}
 {SPACE}			 ;

 	/* Register/SCB/SRAM definition keywords */
 export			{ return T_EXPORT; }
 register		{ return T_REGISTER; }
 const			{ yylval.value = FALSE; return T_CONST; }
 download		{ return T_DOWNLOAD; }
 address			{ return T_ADDRESS; }
 count			{ return T_COUNT; }
 access_mode		{ return T_ACCESS_MODE; }
 dont_generate_debug_code { return T_DONT_GENERATE_DEBUG_CODE; }
 modes			{ return T_MODES; }
 RW|RO|WO		{
 				 if (strcmp(yytext, "RW") == 0)
 					yylval.value = RW;
 				 else if (strcmp(yytext, "RO") == 0)
 					yylval.value = RO;
 				 else
 					yylval.value = WO;
 				 return T_MODE;
 			}
 field			{ return T_FIELD; }
 enum			{ return T_ENUM; }
 mask			{ return T_MASK; }
 alias			{ return T_ALIAS; }
 size			{ return T_SIZE; }
 scb			{ return T_SCB; }
 scratch_ram		{ return T_SRAM; }
 accumulator		{ return T_ACCUM; }
 mode_pointer		{ return T_MODE_PTR; }
 allones			{ return T_ALLONES; }
 allzeros		{ return T_ALLZEROS; }
 none			{ return T_NONE; }
 sindex			{ return T_SINDEX; }
 A			{ return T_A; }

 	/* Instruction Formatting */
 PAD_PAGE		{ return T_PAD_PAGE; }
 BEGIN_CRITICAL		{ return T_BEGIN_CS; }
 END_CRITICAL		{ return T_END_CS; }
 SET_SRC_MODE		{ return T_SET_SRC_MODE; }
 SET_DST_MODE		{ return T_SET_DST_MODE; }

 	/* Opcodes */
 shl			{ return T_SHL; }
 shr			{ return T_SHR; }
 ror			{ return T_ROR; }
 rol			{ return T_ROL; }
 mvi			{ return T_MVI; }
 mov			{ return T_MOV; }
 clr			{ return T_CLR; }
 jmp			{ return T_JMP; }
 jc			{ return T_JC;	}
 jnc			{ return T_JNC;	}
 je			{ return T_JE;	}
 jne			{ return T_JNE;	}
 jz			{ return T_JZ;	}
 jnz			{ return T_JNZ;	}
 call			{ return T_CALL; }
 add			{ return T_ADD; }
 adc			{ return T_ADC; }
 bmov			{ return T_BMOV; }
 inc			{ return T_INC; }
 dec			{ return T_DEC; }
 stc			{ return T_STC;	}
 clc			{ return T_CLC; }
 cmp			{ return T_CMP;	}
 not			{ return T_NOT;	}
 xor			{ return T_XOR;	}
 test			{ return T_TEST;}
 and			{ return T_AND;	}
 or			{ return T_OR;	}
 ret			{ return T_RET; }
 nop			{ return T_NOP; }

 	/* ARP2 16bit extensions */
 	/* or16			{ return T_OR16; } */
 	/* and16			{ return T_AND16; }*/
 	/* xor16			{ return T_XOR16; }*/
 	/* add16			{ return T_ADD16; }*/
 	/* adc16			{ return T_ADC16; }*/
 	/* mvi16			{ return T_MVI16; }*/
 	/* test16			{ return T_TEST16; }*/
 	/* cmp16			{ return T_CMP16; }*/
 	/* cmpxchg			{ return T_CMPXCHG; }*/

 	/* Allowed Symbols */
 \<\<			{ return T_EXPR_LSHIFT; }
 \>\>			{ return T_EXPR_RSHIFT; }
 [-+,:()~|&."{};<>[\]/*!=] { return yytext[0]; }

 	/* Number processing */
 0[0-7]*			{
 				yylval.value = strtol(yytext, NULL, 8);
 				return T_NUMBER;
 			}

 0[xX][0-9a-fA-F]+	{
 				yylval.value = strtoul(yytext + 2, NULL, 16);
 				return T_NUMBER;
 			}

 [1-9][0-9]*		{
 				yylval.value = strtol(yytext, NULL, 10);
 				return T_NUMBER;
 			}
 	/* Include Files */
 #include{SPACE}		{
 				BEGIN INCLUDE;
 				quote_count = 0;
 				return T_INCLUDE;
 			}
 <INCLUDE>[<]		{ return yytext[0]; }
 <INCLUDE>[>]		{ BEGIN INITIAL; return yytext[0]; }
 <INCLUDE>[\"]		{
 				if (quote_count != 0)
 					BEGIN INITIAL;
 				quote_count++;
 				return yytext[0];
 			}
 <INCLUDE>{PATH}		{
 				char *yptr;

 				yptr = yytext;
 				string_buf_ptr = string_buf;
 				while (*yptr)
 					*string_buf_ptr++ = *yptr++;
 				yylval.str = string_buf;
 				*string_buf_ptr = '\0';
 				return T_PATH;
 			}
 <INCLUDE>.		{ stop("Invalid include line", EX_DATAERR); }
 #define{SPACE}		{
 				BEGIN MACRODEF;
 				return T_DEFINE;
 			}
 <MACRODEF>{WORD}{SPACE}	{
 				char *yptr;

 				/* Strip space and return as a normal symbol */
 				yptr = yytext;
 				while (*yptr != ' ' && *yptr != '\t')
 					yptr++;
 				*yptr = '\0';
 				yylval.sym = symtable_get(yytext);
 				string_buf_ptr = string_buf;
 				BEGIN MACROBODY;
 				return T_SYMBOL;
 			}
 <MACRODEF>{WORD}\(	{
 				/*
 				 * We store the symbol with its opening
 				 * parren so we can differentiate macros
 				 * that take args from macros with the
 				 * same name that do not take args as
 				 * is allowed in C.
 				 */
 				BEGIN MACROARGLIST;
 				yylval.sym = symtable_get(yytext);
 				unput('(');
 				return T_SYMBOL;
 			}
 <MACROARGLIST>{WORD}	{
 				yylval.str = yytext;
 				return T_ARG;
 			}
 <MACROARGLIST>{SPACE}   ;
 <MACROARGLIST>[(,]	{
 				return yytext[0];
 			}
 <MACROARGLIST>[)]	{
 				string_buf_ptr = string_buf;
 				BEGIN MACROBODY;
 				return ')';
 			}
 <MACROARGLIST>.		{
 				snprintf(buf, sizeof(buf), "Invalid character "
 					 "'%c' in macro argument list",
 					 yytext[0]);
 				stop(buf, EX_DATAERR);
 			}
 <MACROCALLARGS>{SPACE}  ;
 <MACROCALLARGS>\(	{
 				parren_count++;
 				if (parren_count == 1)
 					return ('(');
 				*string_buf_ptr++ = '(';
 			}
 <MACROCALLARGS>\)	{
 				parren_count--;
 				if (parren_count == 0) {
 					BEGIN INITIAL;
 					return (')');
 				}
 				*string_buf_ptr++ = ')';
 			}
 <MACROCALLARGS>{MCARG}	{
 				char *yptr;

 				yptr = yytext;
 				while (*yptr)
 					*string_buf_ptr++ = *yptr++;
 			}
 <MACROCALLARGS>\,	{
 				if (string_buf_ptr != string_buf) {
 					/*
 					 * Return an argument and
 					 * rescan this comma so we
 					 * can return it as well.
 					 */
 					*string_buf_ptr = '\0';
 					yylval.str = string_buf;
 					string_buf_ptr = string_buf;
 					unput(',');
 					return T_ARG;
 				}
 				return ',';
 			}
 <MACROBODY>\\\n		{
 				/* Eat escaped newlines. */
 				++yylineno;
 			}
 <MACROBODY>\r		;
 <MACROBODY>\n		{
 				/* Macros end on the first unescaped newline. */
 				BEGIN INITIAL;
 				*string_buf_ptr = '\0';
 				yylval.str = string_buf;
 				++yylineno;
 				return T_MACROBODY;
 			}
 <MACROBODY>{MBODY}	{
 				char *yptr;
 				char c;

 				yptr = yytext;
 				while (c = *yptr++) {
 					/*
 					 * Strip carriage returns.
 					 */
 					if (c == '\r')
 						continue;
 					*string_buf_ptr++ = c;
 				}
 			}
 {WORD}\(		{
 				char *yptr;
 				char *ycopy;

 				/* May be a symbol or a macro invocation. */
 				yylval.sym = symtable_get(yytext);
 				if (yylval.sym->type == MACRO) {
 					YY_BUFFER_STATE old_state;
 					YY_BUFFER_STATE temp_state;

 					ycopy = strdup(yytext);
 					yptr = ycopy + yyleng;
 					while (yptr > ycopy)
 						unput(*--yptr);
 					old_state = YY_CURRENT_BUFFER;
 					temp_state =
 					    yy_create_buffer(stdin,
 							     YY_BUF_SIZE);
 					yy_switch_to_buffer(temp_state);
 					mm_switch_to_buffer(old_state);
 					mmparse();
 					mm_switch_to_buffer(temp_state);
 					yy_switch_to_buffer(old_state);
 					mm_delete_buffer(temp_state);
 					expand_macro(yylval.sym);
 				} else {
 					if (yylval.sym->type == UNINITIALIZED) {
 						/* Try without the '(' */
 						symbol_delete(yylval.sym);
 						yytext[yyleng-1] = '\0';
 						yylval.sym =
 						    symtable_get(yytext);
 					}
 					unput('(');
 					return T_SYMBOL;
 				}
 			}
 {WORD}			{
 				yylval.sym = symtable_get(yytext);
 				if (yylval.sym->type == MACRO) {
 					expand_macro(yylval.sym);
 				} else {
 					return T_SYMBOL;
 				}
 			}
 .			{
 				snprintf(buf, sizeof(buf), "Invalid character "
 					 "'%c'", yytext[0]);
 				stop(buf, EX_DATAERR);
 			}
 %%

 typedef struct include {
         YY_BUFFER_STATE  buffer;
         int              lineno;
         char            *filename;
 	SLIST_ENTRY(include) links;
 }include_t;

 SLIST_HEAD(, include) include_stack;

 void
 include_file(char *file_name, include_type type)
 {
 	FILE *newfile;
 	include_t *include;

 	newfile = NULL;
 	/* Try the current directory first */
 	if (includes_search_curdir != 0 || type == SOURCE_FILE)
 		newfile = fopen(file_name, "r");

 	if (newfile == NULL && type != SOURCE_FILE) {
                 path_entry_t include_dir;
                 for (include_dir = search_path.slh_first;
                      include_dir != NULL;
                      include_dir = include_dir->links.sle_next) {
 			char fullname[PATH_MAX];

 			if ((include_dir->quoted_includes_only == TRUE)
 			 && (type != QUOTED_INCLUDE))
 				continue;

 			snprintf(fullname, sizeof(fullname),
 				 "%s/%s", include_dir->directory, file_name);

 			if ((newfile = fopen(fullname, "r")) != NULL)
 				break;
                 }
         }

 	if (newfile == NULL) {
 		perror(file_name);
 		stop("Unable to open input file", EX_SOFTWARE);
 		/* NOTREACHED */
 	}

 	if (type != SOURCE_FILE) {
 		include = (include_t *)malloc(sizeof(include_t));
 		if (include == NULL) {
 			stop("Unable to allocate include stack entry",
 			     EX_SOFTWARE);
 			/* NOTREACHED */
 		}
 		include->buffer = YY_CURRENT_BUFFER;
 		include->lineno = yylineno;
 		include->filename = yyfilename;
 		SLIST_INSERT_HEAD(&include_stack, include, links);
 	}
 	yy_switch_to_buffer(yy_create_buffer(newfile, YY_BUF_SIZE));
 	yylineno = 1;
 	yyfilename = strdup(file_name);
 }

 static void next_substitution(struct symbol *mac_symbol, const char *body_pos,
 			      const char **next_match,
 			      struct macro_arg **match_marg, regmatch_t *match);

 void
 expand_macro(struct symbol *macro_symbol)
 {
 	struct macro_arg *marg;
 	struct macro_arg *match_marg;
 	const char *body_head;
 	const char *body_pos;
 	const char *next_match;

 	/*
 	 * Due to the nature of unput, we must work
 	 * backwards through the macro body performing
 	 * any expansions.
 	 */
 	body_head = macro_symbol->info.macroinfo->body;
 	body_pos = body_head + strlen(body_head);
 	while (body_pos > body_head) {
 		regmatch_t match;

 		next_match = body_head;
 		match_marg = NULL;
 		next_substitution(macro_symbol, body_pos, &next_match,
 				  &match_marg, &match);

 		/* Put back everything up until the replacement. */
 		while (body_pos > next_match)
 			unput(*--body_pos);

 		/* Perform the replacement. */
 		if (match_marg != NULL) {
 			const char *strp;

 			next_match = match_marg->replacement_text;
 			strp = next_match + strlen(next_match);
 			while (strp > next_match)
 				unput(*--strp);

 			/* Skip past the unexpanded macro arg. */
 			body_pos -= match.rm_eo - match.rm_so;
 		}
 	}

 	/* Cleanup replacement text. */
 	STAILQ_FOREACH(marg, &macro_symbol->info.macroinfo->args, links) {
 		free(marg->replacement_text);
 	}
 }

 /*
  * Find the next substitution in the macro working backwards from
  * body_pos until the beginning of the macro buffer.  next_match
  * should be initialized to the beginning of the macro buffer prior
  * to calling this routine.
  */
 static void
 next_substitution(struct symbol *mac_symbol, const char *body_pos,
 		  const char **next_match, struct macro_arg **match_marg,
 		  regmatch_t *match)
 {
 	regmatch_t	  matches[2];
 	struct macro_arg *marg;
 	const char	 *search_pos;
 	int		  retval;

 	do {
 		search_pos = *next_match;

 		STAILQ_FOREACH(marg, &mac_symbol->info.macroinfo->args, links) {

 			retval = regexec(&marg->arg_regex, search_pos, 2,
 					 matches, 0);
 			if (retval == 0
 			 && (matches[1].rm_eo + search_pos) <= body_pos
 			 && (matches[1].rm_eo + search_pos) > *next_match) {
 				*match = matches[1];
 				*next_match = match->rm_eo + search_pos;
 				*match_marg = marg;
 			}
 		}
 	} while (search_pos != *next_match);
 }

 int
 yywrap()
 {
 	include_t *include;

 	yy_delete_buffer(YY_CURRENT_BUFFER);
 	(void)fclose(yyin);
 	if (yyfilename != NULL)
 		free(yyfilename);
 	yyfilename = NULL;
 	include = include_stack.slh_first;
 	if (include != NULL) {
 		yy_switch_to_buffer(include->buffer);
 		yylineno = include->lineno;
 		yyfilename = include->filename;
 		SLIST_REMOVE_HEAD(&include_stack, links);
 		free(include);
 		return (0);
 	}
 	return (1);
 }
	%{
	/*
	* Lexical Analyzer for the Aic7xxx SCSI Host adapter sequencer assembler.
	*
	* Copyright (c) 1997, 1998, 2000 Justin T. Gibbs.
	* Copyright (c) 2001, 2002 Adaptec Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions, and the following disclaimer,
	* without modification.
	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	* substantially similar to the "NO WARRANTY" disclaimer below
	* ("Disclaimer") and any redistribution must be conditioned upon
	* including a substantially similar Disclaimer requirement for further
	* binary redistribution.
	* 3. Neither the names of the above-listed copyright holders nor the names
	* of any contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* Alternatively, this software may be distributed under the terms of the
	* GNU General Public License ("GPL") version 2 as published by the Free
	* Software Foundation.
	*
	* NO WARRANTY
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGES.
	*
	* $Id: //depot/aic7xxx/aic7xxx/aicasm/aicasm_scan.l#20 $
	*
	* $FreeBSD$
	*/

	#include <sys/types.h>

	#include <inttypes.h>
	#include <limits.h>
	#include <regex.h>
	#include <stdio.h>
	#include <string.h>
	#include <sysexits.h>
	#ifdef __linux__
	#include "../queue.h"
	#else
	#include <sys/queue.h>
	#endif

	#include "aicasm.h"
	#include "aicasm_symbol.h"
	#include "aicasm_gram.h"

	/* This is used for macro body capture too, so err on the large size. */
	#define MAX_STR_CONST 4096
	static char string_buf[MAX_STR_CONST];
	static char *string_buf_ptr;
	static int parren_count;
	static int quote_count;
	static char buf[255];
	%}

	PATH ([/]*[-A-Za-z0-9_.])+
	WORD [A-Za-z_][-A-Za-z_0-9]*
	SPACE [ \t]+
	MCARG [^(), \t]+
	MBODY ((\\[^\n])[^\n\\])+

	%x COMMENT
	%x CEXPR
	%x INCLUDE
	%x STRING
	%x MACRODEF
	%x MACROARGLIST
	%x MACROCALLARGS
	%x MACROBODY

	%%
	\n { ++yylineno; }
	\r ;
	"/" { BEGIN COMMENT; / Enter comment eating state */ }
	<COMMENT>"/*" { fprintf(stderr, "Warning! Comment within comment."); }
	<COMMENT>\n { ++yylineno; }
	<COMMENT>[^/\n] ;
	<COMMENT>""+[^/\n]* ;
	<COMMENT>"/"+[^/\n] ;
	<COMMENT>"*"+"/" { BEGIN INITIAL; }
	if[ \t]*\( {
	string_buf_ptr = string_buf;
	parren_count = 1;
	BEGIN CEXPR;
	return T_IF;
	}
	<CEXPR>\( { *string_buf_ptr++ = '('; parren_count++; }
	<CEXPR>\) {
	parren_count--;
	if (parren_count == 0) {
	/* All done */
	BEGIN INITIAL;
	*string_buf_ptr = '\0';
	yylval.sym = symtable_get(string_buf);
	return T_CEXPR;
	} else {
	*string_buf_ptr++ = ')';
	}
	}
	<CEXPR>\n { ++yylineno; }
	<CEXPR>\r ;
	<CEXPR>[^()\n]+ {
	char *yptr;

	yptr = yytext;
	while (*yptr != '\0') {
	/* Remove duplicate spaces */
	if (*yptr == '\t')
	*yptr = ' ';
	if (*yptr == ' '
	&& string_buf_ptr != string_buf
	&& string_buf_ptr[-1] == ' ')
	yptr++;
	else
	string_buf_ptr++ = yptr++;
	}
	}
	else { return T_ELSE; }
	VERSION { return T_VERSION; }
	PREFIX { return T_PREFIX; }
	PATCH_ARG_LIST { return T_PATCH_ARG_LIST; }
	\" {
	string_buf_ptr = string_buf;
	BEGIN STRING;
	}
	<STRING>[^"]+ {
	char *yptr;

	yptr = yytext;
	while (*yptr)
	string_buf_ptr++ = yptr++;
	}
	<STRING>\" {
	/* All done */
	BEGIN INITIAL;
	*string_buf_ptr = '\0';
	yylval.str = string_buf;
	return T_STRING;
	}
	{SPACE} ;

	/* Register/SCB/SRAM definition keywords */
	export { return T_EXPORT; }
	register { return T_REGISTER; }
	const { yylval.value = FALSE; return T_CONST; }
	download { return T_DOWNLOAD; }
	address { return T_ADDRESS; }
	count { return T_COUNT; }
	access_mode { return T_ACCESS_MODE; }
	dont_generate_debug_code { return T_DONT_GENERATE_DEBUG_CODE; }
	modes { return T_MODES; }
	RW\|RO\|WO {
	if (strcmp(yytext, "RW") == 0)
	yylval.value = RW;
	else if (strcmp(yytext, "RO") == 0)
	yylval.value = RO;
	else
	yylval.value = WO;
	return T_MODE;
	}
	field { return T_FIELD; }
	enum { return T_ENUM; }
	mask { return T_MASK; }
	alias { return T_ALIAS; }
	size { return T_SIZE; }
	scb { return T_SCB; }
	scratch_ram { return T_SRAM; }
	accumulator { return T_ACCUM; }
	mode_pointer { return T_MODE_PTR; }
	allones { return T_ALLONES; }
	allzeros { return T_ALLZEROS; }
	none { return T_NONE; }
	sindex { return T_SINDEX; }
	A { return T_A; }

	/* Instruction Formatting */
	PAD_PAGE { return T_PAD_PAGE; }
	BEGIN_CRITICAL { return T_BEGIN_CS; }
	END_CRITICAL { return T_END_CS; }
	SET_SRC_MODE { return T_SET_SRC_MODE; }
	SET_DST_MODE { return T_SET_DST_MODE; }

	/* Opcodes */
	shl { return T_SHL; }
	shr { return T_SHR; }
	ror { return T_ROR; }
	rol { return T_ROL; }
	mvi { return T_MVI; }
	mov { return T_MOV; }
	clr { return T_CLR; }
	jmp { return T_JMP; }
	jc { return T_JC; }
	jnc { return T_JNC; }
	je { return T_JE; }
	jne { return T_JNE; }
	jz { return T_JZ; }
	jnz { return T_JNZ; }
	call { return T_CALL; }
	add { return T_ADD; }
	adc { return T_ADC; }
	bmov { return T_BMOV; }
	inc { return T_INC; }
	dec { return T_DEC; }
	stc { return T_STC; }
	clc { return T_CLC; }
	cmp { return T_CMP; }
	not { return T_NOT; }
	xor { return T_XOR; }
	test { return T_TEST;}
	and { return T_AND; }
	or { return T_OR; }
	ret { return T_RET; }
	nop { return T_NOP; }

	/* ARP2 16bit extensions */
	/* or16 { return T_OR16; } */
	/* and16 { return T_AND16; }*/
	/* xor16 { return T_XOR16; }*/
	/* add16 { return T_ADD16; }*/
	/* adc16 { return T_ADC16; }*/
	/* mvi16 { return T_MVI16; }*/
	/* test16 { return T_TEST16; }*/
	/* cmp16 { return T_CMP16; }*/
	/* cmpxchg { return T_CMPXCHG; }*/

	/* Allowed Symbols */
	\<\< { return T_EXPR_LSHIFT; }
	\>\> { return T_EXPR_RSHIFT; }
	[-+,:()~\|&."{};<>[\]/*!=] { return yytext[0]; }

	/* Number processing */
	0[0-7]* {
	yylval.value = strtol(yytext, NULL, 8);
	return T_NUMBER;
	}

	0[xX][0-9a-fA-F]+ {
	yylval.value = strtoul(yytext + 2, NULL, 16);
	return T_NUMBER;
	}

	[1-9][0-9]* {
	yylval.value = strtol(yytext, NULL, 10);
	return T_NUMBER;
	}
	/* Include Files */
	#include{SPACE} {
	BEGIN INCLUDE;
	quote_count = 0;
	return T_INCLUDE;
	}
	<INCLUDE>[<] { return yytext[0]; }
	<INCLUDE>[>] { BEGIN INITIAL; return yytext[0]; }
	<INCLUDE>[\"] {
	if (quote_count != 0)
	BEGIN INITIAL;
	quote_count++;
	return yytext[0];
	}
	<INCLUDE>{PATH} {
	char *yptr;

	yptr = yytext;
	string_buf_ptr = string_buf;
	while (*yptr)
	string_buf_ptr++ = yptr++;
	yylval.str = string_buf;
	*string_buf_ptr = '\0';
	return T_PATH;
	}
	<INCLUDE>. { stop("Invalid include line", EX_DATAERR); }
	#define{SPACE} {
	BEGIN MACRODEF;
	return T_DEFINE;
	}
	<MACRODEF>{WORD}{SPACE} {
	char *yptr;

	/* Strip space and return as a normal symbol */
	yptr = yytext;
	while (yptr != ' ' && yptr != '\t')
	yptr++;
	*yptr = '\0';
	yylval.sym = symtable_get(yytext);
	string_buf_ptr = string_buf;
	BEGIN MACROBODY;
	return T_SYMBOL;
	}
	<MACRODEF>{WORD}\( {
	/*
	* We store the symbol with its opening
	* parren so we can differentiate macros
	* that take args from macros with the
	* same name that do not take args as
	* is allowed in C.
	*/
	BEGIN MACROARGLIST;
	yylval.sym = symtable_get(yytext);
	unput('(');
	return T_SYMBOL;
	}
	<MACROARGLIST>{WORD} {
	yylval.str = yytext;
	return T_ARG;
	}
	<MACROARGLIST>{SPACE} ;
	<MACROARGLIST>[(,] {
	return yytext[0];
	}
	<MACROARGLIST>[)] {
	string_buf_ptr = string_buf;
	BEGIN MACROBODY;
	return ')';
	}
	<MACROARGLIST>. {
	snprintf(buf, sizeof(buf), "Invalid character "
	"'%c' in macro argument list",
	yytext[0]);
	stop(buf, EX_DATAERR);
	}
	<MACROCALLARGS>{SPACE} ;
	<MACROCALLARGS>\( {
	parren_count++;
	if (parren_count == 1)
	return ('(');
	*string_buf_ptr++ = '(';
	}
	<MACROCALLARGS>\) {
	parren_count--;
	if (parren_count == 0) {
	BEGIN INITIAL;
	return (')');
	}
	*string_buf_ptr++ = ')';
	}
	<MACROCALLARGS>{MCARG} {
	char *yptr;

	yptr = yytext;
	while (*yptr)
	string_buf_ptr++ = yptr++;
	}
	<MACROCALLARGS>\, {
	if (string_buf_ptr != string_buf) {
	/*
	* Return an argument and
	* rescan this comma so we
	* can return it as well.
	*/
	*string_buf_ptr = '\0';
	yylval.str = string_buf;
	string_buf_ptr = string_buf;
	unput(',');
	return T_ARG;
	}
	return ',';
	}
	<MACROBODY>\\\n {
	/* Eat escaped newlines. */
	++yylineno;
	}
	<MACROBODY>\r ;
	<MACROBODY>\n {
	/* Macros end on the first unescaped newline. */
	BEGIN INITIAL;
	*string_buf_ptr = '\0';
	yylval.str = string_buf;
	++yylineno;
	return T_MACROBODY;
	}
	<MACROBODY>{MBODY} {
	char *yptr;
	char c;

	yptr = yytext;
	while (c = *yptr++) {
	/*
	* Strip carriage returns.
	*/
	if (c == '\r')
	continue;
	*string_buf_ptr++ = c;
	}
	}
	{WORD}\( {
	char *yptr;
	char *ycopy;

	/* May be a symbol or a macro invocation. */
	yylval.sym = symtable_get(yytext);
	if (yylval.sym->type == MACRO) {
	YY_BUFFER_STATE old_state;
	YY_BUFFER_STATE temp_state;

	ycopy = strdup(yytext);
	yptr = ycopy + yyleng;
	while (yptr > ycopy)
	unput(*--yptr);
	old_state = YY_CURRENT_BUFFER;
	temp_state =
	yy_create_buffer(stdin,
	YY_BUF_SIZE);
	yy_switch_to_buffer(temp_state);
	mm_switch_to_buffer(old_state);
	mmparse();
	mm_switch_to_buffer(temp_state);
	yy_switch_to_buffer(old_state);
	mm_delete_buffer(temp_state);
	expand_macro(yylval.sym);
	} else {
	if (yylval.sym->type == UNINITIALIZED) {
	/* Try without the '(' */
	symbol_delete(yylval.sym);
	yytext[yyleng-1] = '\0';
	yylval.sym =
	symtable_get(yytext);
	}
	unput('(');
	return T_SYMBOL;
	}
	}
	{WORD} {
	yylval.sym = symtable_get(yytext);
	if (yylval.sym->type == MACRO) {
	expand_macro(yylval.sym);
	} else {
	return T_SYMBOL;
	}
	}
	. {
	snprintf(buf, sizeof(buf), "Invalid character "
	"'%c'", yytext[0]);
	stop(buf, EX_DATAERR);
	}
	%%

	typedef struct include {
	YY_BUFFER_STATE buffer;
	int lineno;
	char *filename;
	SLIST_ENTRY(include) links;
	}include_t;

	SLIST_HEAD(, include) include_stack;

	void
	include_file(char *file_name, include_type type)
	{
	FILE *newfile;
	include_t *include;

	newfile = NULL;
	/* Try the current directory first */
	if (includes_search_curdir != 0 \|\| type == SOURCE_FILE)
	newfile = fopen(file_name, "r");

	if (newfile == NULL && type != SOURCE_FILE) {
	path_entry_t include_dir;
	for (include_dir = search_path.slh_first;
	include_dir != NULL;
	include_dir = include_dir->links.sle_next) {
	char fullname[PATH_MAX];

	if ((include_dir->quoted_includes_only == TRUE)
	&& (type != QUOTED_INCLUDE))
	continue;

	snprintf(fullname, sizeof(fullname),
	"%s/%s", include_dir->directory, file_name);

	if ((newfile = fopen(fullname, "r")) != NULL)
	break;
	}
	}

	if (newfile == NULL) {
	perror(file_name);
	stop("Unable to open input file", EX_SOFTWARE);
	/* NOTREACHED */
	}

	if (type != SOURCE_FILE) {
	include = (include_t *)malloc(sizeof(include_t));
	if (include == NULL) {
	stop("Unable to allocate include stack entry",
	EX_SOFTWARE);
	/* NOTREACHED */
	}
	include->buffer = YY_CURRENT_BUFFER;
	include->lineno = yylineno;
	include->filename = yyfilename;
	SLIST_INSERT_HEAD(&include_stack, include, links);
	}
	yy_switch_to_buffer(yy_create_buffer(newfile, YY_BUF_SIZE));
	yylineno = 1;
	yyfilename = strdup(file_name);
	}

	static void next_substitution(struct symbol mac_symbol, const char body_pos,
	const char **next_match,
	struct macro_arg *match_marg, regmatch_t match);

	void
	expand_macro(struct symbol *macro_symbol)
	{
	struct macro_arg *marg;
	struct macro_arg *match_marg;
	const char *body_head;
	const char *body_pos;
	const char *next_match;

	/*
	* Due to the nature of unput, we must work
	* backwards through the macro body performing
	* any expansions.
	*/
	body_head = macro_symbol->info.macroinfo->body;
	body_pos = body_head + strlen(body_head);
	while (body_pos > body_head) {
	regmatch_t match;

	next_match = body_head;
	match_marg = NULL;
	next_substitution(macro_symbol, body_pos, &next_match,
	&match_marg, &match);

	/* Put back everything up until the replacement. */
	while (body_pos > next_match)
	unput(*--body_pos);

	/* Perform the replacement. */
	if (match_marg != NULL) {
	const char *strp;

	next_match = match_marg->replacement_text;
	strp = next_match + strlen(next_match);
	while (strp > next_match)
	unput(*--strp);

	/* Skip past the unexpanded macro arg. */
	body_pos -= match.rm_eo - match.rm_so;
	}
	}

	/* Cleanup replacement text. */
	STAILQ_FOREACH(marg, &macro_symbol->info.macroinfo->args, links) {
	free(marg->replacement_text);
	}
	}

	/*
	* Find the next substitution in the macro working backwards from
	* body_pos until the beginning of the macro buffer. next_match
	* should be initialized to the beginning of the macro buffer prior
	* to calling this routine.
	*/
	static void
	next_substitution(struct symbol mac_symbol, const char body_pos,
	const char next_match, struct macro_arg match_marg,
	regmatch_t *match)
	{
	regmatch_t matches[2];
	struct macro_arg *marg;
	const char *search_pos;
	int retval;

	do {
	search_pos = *next_match;

	STAILQ_FOREACH(marg, &mac_symbol->info.macroinfo->args, links) {

	retval = regexec(&marg->arg_regex, search_pos, 2,
	matches, 0);
	if (retval == 0
	&& (matches[1].rm_eo + search_pos) <= body_pos
	&& (matches[1].rm_eo + search_pos) > *next_match) {
	*match = matches[1];
	*next_match = match->rm_eo + search_pos;
	*match_marg = marg;
	}
	}
	} while (search_pos != *next_match);
	}

	int
	yywrap()
	{
	include_t *include;

	yy_delete_buffer(YY_CURRENT_BUFFER);
	(void)fclose(yyin);
	if (yyfilename != NULL)
	free(yyfilename);
	yyfilename = NULL;
	include = include_stack.slh_first;
	if (include != NULL) {
	yy_switch_to_buffer(include->buffer);
	yylineno = include->lineno;
	yyfilename = include->filename;
	SLIST_REMOVE_HEAD(&include_stack, links);
	free(include);
	return (0);
	}
	return (1);
	}