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lex.c
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lex.c
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#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "instrs.h"
#include "lint.h"
#include "lang.h"
#include "string.h"
#include "config.h"
#include "interpret.h"
#include "exec.h"
#include "lex.h"
#if defined(__GNUC__) && !defined(lint)
#define INLINE inline
#else
#define INLINE
#endif
#define isalunum(c) (isalnum(c) || (c) == '_')
#define NELEM(a) (sizeof (a) / sizeof (a)[0])
int current_line;
int total_lines; /* Used to compute average compiled lines/s */
char *current_file;
int pragma_strict_types; /* Force usage of strict types. */
int pragma_save_types; /* Save argument types after compilation */
struct lpc_predef_s *lpc_predefs=NULL;
extern char *argument_name;
extern char *xalloc();
static int number PROT((int)), ident PROT((char *)), string PROT((char *));
static int islocal PROT((char *));
static void handle_define PROT((char *));
static void free_defines PROT((void)), add_define PROT((char *, int, char *));
static int expand_define PROT((void));
static void add_input PROT((char *));
static void myungetc PROT((int));
static int lookup_resword PROT((char *));
static int cond_get_exp PROT((int));
static int exgetc();
static FILE *yyin;
static int lex_fatal;
static char **inc_list;
static int inc_list_size;
#define EXPANDMAX 25000
static int nexpands;
extern char *local_names[];
extern int current_number_of_locals;
extern char *string_copy();
#ifndef tolower
extern int tolower PROT((int));
#endif
void yyerror(), error(), free();
#define MAXLINE 1024
static char yytext[MAXLINE];
static int slast, lastchar;
struct defn {
struct defn *next;
char *name;
int undef;
char *exps;
int nargs;
};
struct defn *lookup_define();
static struct ifstate {
struct ifstate *next;
int state;
} *iftop = 0;
#define EXPECT_ELSE 1
#define EXPECT_ENDIF 2
static struct incstate {
struct incstate *next;
FILE *yyin;
int line;
char *file;
int slast, lastchar;
int pragma_strict_types;
} *inctop = 0;
#define DEFMAX 10000
static char defbuf[DEFMAX];
static int nbuf;
static char *outp;
void merge(name, dest)
char *name, *dest;
{
char *from;
strcpy(dest, current_file);
if (from = strrchr(dest, '/')) /* strip filename */
*from = 0;
else
/* current_file was the file_name */
/* include from the root directory */
*dest = 0;
from = name;
while (*from == '/') {
from++;
*dest=0; /* absolute path */
}
while(*from) {
if(!strncmp(from, "../", 3)) {
char *tmp;
if(*dest == 0) /* including from above mudlib is NOT allowed */
break;
tmp = strrchr(dest, '/');
if(tmp == NULL) /* 1 component in dest */
*dest = 0;
else
*tmp = 0;
from +=3; /* skip "../" */
}
else if(!strncmp(from, "./", 2)) {
from += 2;
}
else { /* append first component to dest */
char *q;
if(*dest)
strcat(dest, "/"); /* only if dest is not empty !! */
q = strchr(from, '/');
if(q) { /* from has 2 or more components */
while(*from=='/') /* find the start */
from++;
strncat(dest, from, q - from);
for(from = q+1;*from=='/';from++)
;
}
else {
/* this was the last component */
strcat(dest, from);
break;
}
}
}
}
static INLINE int
mygetc()
{
int c;
if (nbuf) {
nbuf--;
c = *outp++;
} else {
c = getc(yyin);
}
lastchar = slast;
slast = c;
/*fprintf(stderr, "c='%c'", c);*/
return c;
}
static INLINE int
gobble(c)
int c;
{
int d;
d = mygetc();
if (c == d)
return 1;
*--outp = d;
nbuf++;
return 0;
}
static void
lexerror(s)
char *s;
{
yyerror(s);
lex_fatal++;
}
static int
skip_to(token, atoken)
char *token, *atoken;
{
char b[20], *p;
int c;
int nest;
for(nest = 0;;) {
c = mygetc();
if (c == '#') {
do {
c = mygetc();
} while(isspace(c));
for(p = b; c != '\n' && c != EOF; ) {
if (p < b+sizeof b-1)
*p++ = c;
c = mygetc();
}
*p++ = 0;
for(p = b; *p && !isspace(*p); p++)
;
*p = 0;
/*fprintf(stderr, "skip checks %s\n", b);*/
if (strcmp(b, "if") == 0 || strcmp(b, "ifdef") == 0 ||
strcmp(b, "ifndef") == 0) {
nest++;
} else if (nest > 0) {
if (strcmp(b, "endif") == 0)
nest--;
} else {
if (strcmp(b, token) == 0)
return 1;
else if (atoken && strcmp(b, atoken) == 0)
return 0;
}
} else {
/*fprintf(stderr, "skipping (%d) %c", c, c);*/
while (c != '\n' && c != EOF) {
c = mygetc();
/*fprintf(stderr, "%c", c);*/
}
if (c == EOF) {
lexerror("Unexpected end of file while skipping");
return 1;
}
}
if (inctop == 0)
store_line_number_info();
current_line++;
total_lines++;
}
}
static void
handle_cond(c)
int c;
{
struct ifstate *p;
/*fprintf(stderr, "cond %d\n", c);*/
if (c || skip_to("else", "endif")) {
p = (struct ifstate *)xalloc(sizeof(struct ifstate));
p->next = iftop;
iftop = p;
p->state = c ? EXPECT_ELSE : EXPECT_ENDIF;
}
if (!c) {
if (inctop == 0)
store_line_number_info();
current_line++;
total_lines++;
}
}
static FILE *
inc_open(buf, name)
char *buf, *name;
{
FILE *f;
int i;
char *p;
merge(name, buf);
if ((f = fopen(buf, "r")) != NULL)
return f;
/*
* Search all include dirs specified.
*/
for (p=strchr(name, '.'); p; p = strchr(p+1, '.')) {
if (p[1] == '.')
return NULL;
}
for (i=0; i < inc_list_size; i++) {
sprintf(buf, inc_list[i], name);
f = fopen(buf, "r");
if (f)
return f;
}
return NULL;
}
static void
handle_include(name)
char *name;
{
char *p;
char buf[1024];
FILE *f;
struct incstate *is;
int delim;
/*fprintf(stderr, "handle include '%s'\n", name);*/
if (nbuf) {
lexerror("Internal preprocessor error");
return;
}
if (*name != '"' && *name != '<') {
struct defn *d;
if ((d = lookup_define(name)) && d->nargs == -1) {
char *q;
q = d->exps;
while(isspace(*q))
q++;
handle_include(q);
} else {
yyerror("Missing leading \" or < in #include");
}
return;
}
delim = *name++ == '"' ? '"' : '>';
for(p = name; *p && *p != delim; p++)
;
if (!*p) {
yyerror("Missing trailing \" or > in #include");
return;
}
if (strlen(name) > sizeof(buf) - 100) {
yyerror("Include name too long.");
return;
}
*p = 0;
if ((f = inc_open(buf, name)) != NULL) {
is = (struct incstate *)xalloc(sizeof(struct incstate));
is->yyin = yyin;
is->line = current_line;
is->file = current_file;
is->slast = slast;
is->lastchar = lastchar;
is->next = inctop;
is->pragma_strict_types = pragma_strict_types;
pragma_strict_types = 0;
inctop = is;
current_line = 1;
current_file = xalloc(strlen(buf)+1);
strcpy(current_file, buf);
slast = lastchar = '\n';
yyin = f;
/*fprintf(stderr, "pushed to %s\n", buf);*/
} else {
sprintf(buf, "Cannot #include %s\n", name);
yyerror(buf);
}
}
static void
skip_comment()
{
int c;
for(;;) {
while((c = mygetc()) != '*') {
if (c == EOF) {
lexerror("End of file in a comment");
return;
}
if (c == '\n') {
if (inctop == 0)
store_line_number_info();
nexpands=0;
current_line++;
}
}
do {
if ((c = mygetc()) == '/')
return;
if (c == '\n') {
if (inctop == 0)
store_line_number_info();
nexpands=0;
current_line++;
}
} while(c == '*');
}
}
#define TRY(c, t) if (gobble(c)) return t
static void
deltrail(sp)
char *sp;
{
char *p;
p = sp;
if (!*p) {
lexerror("Illegal # command");
} else {
while(*p && !isspace(*p))
p++;
*p = 0;
}
}
#define SAVEC \
if (yyp < yytext+MAXLINE-5)\
*yyp++ = c;\
else {\
lexerror("Line too long");\
break;\
}
static void handle_pragma(str)
char *str;
{
if (strcmp(str, "strict_types") == 0) {
pragma_strict_types = 1;
} else if (strcmp(str, "save_types") == 0) {
pragma_save_types = 1;
}
}
static int
yylex1()
{
register char *yyp;
register int c;
for(;;) {
if (lex_fatal) {
return -1;
}
switch(c = mygetc()) {
case EOF:
if (inctop) {
struct incstate *p;
p = inctop;
fclose(yyin);
/*fprintf(stderr, "popping to %s\n", p->file);*/
free(current_file);
nexpands=0;
current_file = p->file;
current_line = p->line + 1;
pragma_strict_types = p->pragma_strict_types;
yyin = p->yyin;
slast = p->slast;
lastchar = p->lastchar;
inctop = p->next;
if (inctop == 0)
store_line_number_info();
free((char *)p);
break;
}
if (iftop) {
struct ifstate *p = iftop;
yyerror(p->state == EXPECT_ENDIF ? "Missing #endif" : "Missing #else");
while(iftop) {
p = iftop;
iftop = p->next;
free((char *)p);
}
}
return -1;
case '\n':
{
if (inctop == 0)
store_line_number_info();
nexpands=0;
current_line++;
total_lines++;
}
case ' ':
case '\t':
case '\f':
case '\v':
break;
case '+':
TRY('+', F_INC);
TRY('=', F_ADD_EQ);
return c;
case '-':
TRY('>', F_ARROW);
TRY('-', F_DEC);
TRY('=', F_SUB_EQ);
return c;
case '&':
TRY('&', F_LAND);
TRY('=', F_AND_EQ);
return c;
case '|':
TRY('|', F_LOR);
TRY('=', F_OR_EQ);
return c;
case '^':
TRY('=', F_XOR_EQ);
return c;
case '<':
if (gobble('<')) {
TRY('=', F_LSH_EQ);
return F_LSH;
}
TRY('=', F_LE);
return c;
case '>':
if (gobble('>')) {
TRY('=', F_RSH_EQ);
return F_RSH;
}
TRY('=', F_GE);
return c;
case '*':
TRY('=', F_MULT_EQ);
return c;
case '%':
TRY('=', F_MOD_EQ);
return c;
case '/':
if (gobble('*')) {
skip_comment();
break;
}
TRY('=', F_DIV_EQ);
return c;
case '=':
TRY('=', F_EQ);
return c;
case ';':
case '(':
case ')':
case ',':
case '{':
case '}':
case '~':
case '[':
case ']':
case '?':
return c;
case '!':
TRY('=', F_NE);
return F_NOT;
case ':':
TRY(':', F_COLON_COLON);
return ':';
case '.':
TRY('.',F_RANGE);
goto badlex;
case '#':
if (lastchar == '\n') {
char *sp = 0;
int quote;
yyp = yytext;
do {
c = mygetc();
} while (isspace(c));
for(quote = 0;;) {
if (c == '"')
quote ^= 1;
while(!quote && c == '/') { /*gc - handle comments cpp-like! 1.6.91 @@@*/
if(gobble('*')) {
skip_comment();
c=mygetc();
} else
break;
}
if (!sp && isspace(c))
sp = yyp;
if (c == '\n' || c == EOF)
break;
SAVEC;
c = mygetc();
}
if (sp) {
*sp++ = 0;
while(isspace(*sp))
sp++;
} else {
sp = yyp;
}
*yyp = 0;
if (strcmp("define", yytext) == 0) {
handle_define(sp);
} else if (strcmp("if", yytext) == 0) {
#if 0
short int nega=0; /*@@@ allow #if !VAR gc 1.6.91*/
if (*sp=='!'){ sp++; nega=1;}
if (isdigit(*sp)) {
char *p;
long l;
l = strtol(sp, &p, 10);
while(isspace(*p))
p++;
if (*p)
yyerror("Condition too complex in #if");
else
handle_cond(nega?!(int)l:(int)l);
} else if (isalunum(*sp)) {
char *p = sp;
while(isalunum(*p))
p++;
if (*p) {
*p++ = 0;
while(isspace(*p))
p++;
}
if (*p)
yyerror("Condition too complex in #if");
else {
struct defn *d;
d = lookup_define(sp);
if (d) {
handle_cond(nega?!atoi(d->exps):atoi(d->exps));/* a hack! */
} else {
handle_cond(nega?1:0); /* cpp-like gc*/
}
}
} else
yyerror("Condition too complex in #if");
#else
int cond;
myungetc(0);
add_input(sp);
cond=cond_get_exp(0);
if (mygetc()) {
yyerror("Condition too complex in #if");
while ( mygetc() ) ;
} else
handle_cond(cond);
#endif
} else if (strcmp("ifdef", yytext) == 0) {
deltrail(sp);
handle_cond(lookup_define(sp) != 0);
} else if (strcmp("ifndef", yytext) == 0) {
deltrail(sp);
handle_cond(lookup_define(sp) == 0);
} else if (strcmp("else", yytext) == 0) {
if (iftop && iftop->state == EXPECT_ELSE) {
struct ifstate *p = iftop;
/*fprintf(stderr, "found else\n");*/
iftop = p->next;
free((char *)p);
skip_to("endif", (char *)0);
current_line++;
total_lines++;
} else {
yyerror("Unexpected #else");
}
} else if (strcmp("endif", yytext) == 0) {
if (iftop && (iftop->state == EXPECT_ENDIF ||
iftop->state == EXPECT_ELSE)) {
struct ifstate *p = iftop;
/*fprintf(stderr, "found endif\n");*/
iftop = p->next;
free((char *)p);
} else {
yyerror("Unexpected #endif");
}
} else if (strcmp("undef", yytext) == 0) {
struct defn *d;
deltrail(sp);
if (d = lookup_define(sp))
d->undef++;
} else if (strcmp("echo", yytext) == 0) {
fprintf(stderr, "%s\n", sp);
} else if (strcmp("include", yytext) == 0) {
/*fprintf(stderr, "including %s\n", sp); */
handle_include(sp);
} else if (strcmp("pragma", yytext) == 0) {
handle_pragma(sp);
} else {
yyerror("Unrecognised # directive");
}
myungetc('\n');
break;
} else
goto badlex;
case '\'':
yylval.number = mygetc();
if (yylval.number == '\\')
yylval.number = mygetc();
if (!gobble('\''))
yyerror("Illegal character constant");
return F_NUMBER;
case '"':
yyp = yytext;
*yyp++ = c;
for(;;) {
c = mygetc();
if (c == EOF) {
lexerror("End of file in string");
return string("\"\"");
} else if (c == '\n') {
lexerror("Newline in string");
return string("\"\"");
}
SAVEC;
if (c == '"')
break;
if (c == '\\') {
c = mygetc();
if ( c == '\n' ) {
yyp--;
if (inctop == 0)
store_line_number_info();
current_line++;
total_lines++;
} else if ( c == EOF ) {
myungetc(c); /* some operating systems give EOF only once */
} else *yyp++ = c;
}
}
*yyp = 0;
return string(yytext);
case '0':
c = mygetc();
if ( c == 'X' || c == 'x' ) {
yyp=yytext;
for(;;) {
c = mygetc();
SAVEC;
if (!isxdigit(c))
break;
}
myungetc(c);
return number( (int)strtol(yytext,(char**)NULL,0x10) );
}
myungetc(c);
c = '0';
/* fall through */
case '1':case '2':case '3':case '4':
case '5':case '6':case '7':case '8':case '9':
yyp = yytext;
*yyp++ = c;
for(;;) {
c = mygetc();
if (!isdigit(c))
break;
SAVEC;
}
myungetc(c);
*yyp = 0;
return number(atoi(yytext));
default:
if (isalpha(c) || c == '_') {
int r;
yyp = yytext;
*yyp++ = c;
for(;;) {
c = mygetc();
if (!isalunum(c))
break;
SAVEC;
}
*yyp = 0;
myungetc(c);
if (!expand_define()) {
r = lookup_resword(yytext);
if (r >= 0) {
return r;
} else
return ident(yytext);
}
break;
}
goto badlex;
}
}
badlex:
{ char buff[100]; sprintf(buff, "Illegal character (hex %02x) '%c'", c, c);
yyerror(buff); return ' '; }
}
int
yylex()
{
int r;
yytext[0] = 0;
r = yylex1();
/* fprintf(stderr, "lex=%d(%s) ", r, yytext);*/
return r;
}
extern YYSTYPE yylval;
static int islocal(str)
char *str;
{
int i;
for (i=current_number_of_locals-1; i>=0; i--) {
if (strcmp(local_names[i], str) == 0)
return i;
}
return -1;
}
static int ident(str)
char *str;
{
int i;
i = islocal(str);
if (i >= 0) {
yylval.number = i;
return F_LOCAL_NAME;
}
yylval.string = string_copy(str);
return F_IDENTIFIER;
}
static int string(str)
char *str;
{
char *p;
if (!*str) {
str = "\"\"";
}
p = xalloc(strlen(str));
yylval.string = p;
for (str++; str[0] && str[1] ; str++, p++) {
if (str[0] == '\\') {
if (str[1] == 'n') {
*p = '\n';
} else if (str[1] == 't') {
*p = '\t';
} else if (str[1] == 'r') {
*p = '\r';
} else if (str[1] == 'b') {
*p = '\b';
} else
*p = str[1];
str++;
} else
*p = *str;
}
*p = '\0';
return F_STRING;
}
static int number(i)
int i;
{
yylval.number = i;
return F_NUMBER;
}
void end_new_file()
{
while (inctop) {
struct incstate *p;
p = inctop;
fclose(yyin);
free(current_file);
current_file = p->file;
yyin = p->yyin;
inctop = p->next;
free((char *)p);
}
while(iftop) {
struct ifstate *p;
p = iftop;
iftop = p->next;
free((char *)p);
}
}
void start_new_file(f)
FILE *f;
{
struct lpc_predef_s *tmpf;
free_defines();
add_define("LPC3", -1, "");
#ifdef COMPAT_MODE
add_define("COMPAT_FLAG", -1, "");
#endif
for (tmpf=lpc_predefs; tmpf; tmpf=tmpf->next) {
char namebuf[NSIZE];
char mtext[MLEN];
*mtext='\0';
sscanf(tmpf->flag,"%[^=]=%[ -~=]",namebuf,mtext);
if ( strlen(namebuf) >= NSIZE ) fatal("NSIZE exceeded");
if ( strlen(mtext) >= MLEN ) fatal("MLEN exceeded");
add_define(namebuf,-1,mtext);
}
yyin = f;
slast = '\n';
lastchar = '\n';
current_line = 1;
lex_fatal = 0;
nbuf = 0;
outp = defbuf+DEFMAX;
pragma_strict_types = 0; /* I would prefer !o_flag /Lars */
nexpands = 0;
}
/*
* The number of arguments stated below, are used by the compiler.
* If min == max, then no information has to be coded about the
* actual number of arguments. Otherwise, the actual number of arguments
* will be stored in the byte after the instruction.
* A maximum value of -1 means unlimited maximum value.
*
* If an argument has type 0 (T_INVALID) specified, then no checks will
* be done at run time.
*
* The argument types are currently not checked by the compiler,
* only by the runtime.
*/
static struct keyword {
char *word;
short token;
short min_args; /* Minimum number of arguments. */
short max_args; /* Maximum number of arguments. */
short ret_type; /* The return type used by the compiler. */
char arg_type1; /* Type of argument 1 */
char arg_type2; /* Type of argument 2 */
char arg_index; /* Index pointing to where to find arg type */
short Default; /* an efun to use as default for last argument */
} predefs[] =
#include "efun_defs.c"
static struct keyword reswords[] = {
{ "break", F_BREAK, },
{ "case", F_CASE, },
{ "catch", F_CATCH, },
{ "continue", F_CONTINUE, },
{ "default", F_DEFAULT, },
{ "do", F_DO, },
{ "else", F_ELSE, },
{ "for", F_FOR, },
{ "if", F_IF, },
{ "inherit", F_INHERIT, },
{ "int", F_INT, },
{ "mixed", F_MIXED, },
{ "nomask", F_NO_MASK, },
{ "object", F_OBJECT, },
{ "parse_command", F_PARSE_COMMAND, },
{ "private", F_PRIVATE, },
{ "protected", F_PROTECTED, },
{ "public", F_PUBLIC, },
{ "return", F_RETURN, },
{ "sscanf", F_SSCANF, },
{ "static", F_STATIC, },
{ "status", F_STATUS, },
{ "string", F_STRING_DECL, },
{ "switch", F_SWITCH, },
{ "varargs", F_VARARGS, },
{ "void", F_VOID, },
{ "while", F_WHILE, },
};
struct instr instrs[256];
static void add_instr_name(name, n)
char *name;
int n;
{
instrs[n - F_OFFSET].name = name;
}
void init_num_args()
{
int i, n;
for(i=0; i<NELEM(predefs); i++) {
n = predefs[i].token - F_OFFSET;
if (n < 0 || n > NELEM(instrs))
fatal("Token %s has illegal value %d.\n", predefs[i].word, n);
instrs[n].min_arg = predefs[i].min_args;
instrs[n].max_arg = predefs[i].max_args;
instrs[n].name = predefs[i].word;
instrs[n].type[0] = predefs[i].arg_type1;
instrs[n].type[1] = predefs[i].arg_type2;
instrs[n].Default = predefs[i].Default;
instrs[n].ret_type = predefs[i].ret_type;
instrs[n].arg_index = predefs[i].arg_index;
}
add_instr_name("<", F_LT);
add_instr_name(">", F_GT);
add_instr_name("<=", F_LE);
add_instr_name(">=", F_GE);
add_instr_name("==", F_EQ);
add_instr_name("+=", F_ADD_EQ);
add_instr_name("!", F_NOT);
add_instr_name("index", F_INDEX);
add_instr_name("push_indexed_lvalue", F_PUSH_INDEXED_LVALUE);
add_instr_name("identifier", F_IDENTIFIER);
add_instr_name("local", F_LOCAL_NAME);