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freebsd-skq/sys/dev/aic7xxx/aicasm/aicasm_scan.l
Justin T. Gibbs 7ce72dbaec Add macro functionality. 
Staticize and allow unique naming of data structures so that more
than on sequencer program can be statically compiled into the kernel
at a time.
2002-04-24 16:24:43 +00:00

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%{
/*
* Lexical Analyzer for the Aic7xxx SCSI Host adapter sequencer assembler.
*
* Copyright (c) 1997, 1998, 2000 Justin T. Gibbs.
* Copyright (c) 2001 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#10 $
*
* $FreeBSD$
*/
#include <sys/types.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; }
"/*" { 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>[^()\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++;
}
}
VERSION { return T_VERSION; }
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; }
access_mode { return T_ACCESS_MODE; }
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;
}
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; }
bit { return T_BIT; }
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; }
/* 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; }
else { return T_ELSE; }
/* 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>\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;
yptr = yytext;
while (*yptr)
*string_buf_ptr++ = *yptr++;
}
{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);
}
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