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lex.c
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lex.c
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/* vim: set ts=8 : */
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <math.h>
#include <float.h>
#include "config.h"
#include "instrs.h"
#include "lint.h"
#include "lang.h"
#include "string.h"
#include "interpret.h"
#include "exec.h"
#include "lex.h"
#include "mstring.h"
#include "mudstat.h"
#include "simulate.h"
#include "efun_table.h"
#include "backend.h"
#include "hash.h"
#define isalunum(c) (isalnum(c) || (c) == '_')
#define NELEM(a) (sizeof (a) / sizeof((a)[0]))
#define WARNING 0
#define ERROR 1
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_no_clone;
int pragma_no_inherit;
int pragma_no_shadow;
int pragma_resident;
extern void smart_log (char *, int, char *);
struct lpc_predef_s *lpc_predefs=NULL;
static void handle_define (char *);
static void free_defines (void), add_define (char *, int, char *);
static int expand_define (void);
static void add_input (char *);
static void myungetc (int);
static int lookup_resword (char *);
static int cond_get_exp (int);
static int exgetc (void);
static void refill (void);
static int cmygetc (void);
static int yylex1 (void);
static void skip_comment (void);
static void skip_comment2 (void);
static INLINE int mygetc (void);
static int number (const long long);
static int real (const double);
static int ident (const char *);
static int string (const char *);
static FILE *yyin;
static int lex_fatal;
static char **inc_list;
static int inc_list_size;
struct allocation_pool lex_allocations = EMPTY_ALLOCATION_POOL;
#define EXPANDMAX 25000
static int nexpands;
extern int s_flag;
#ifndef tolower
extern int tolower (int);
#endif
void yyerror(char *);
int yylex (void);
#define MAXLINE 1024
static char yytext[MAXLINE];
static int slast, lastchar;
static int num_incfiles, current_incfile, incdepth;
struct defn {
struct defn *next;
char *name;
int undef;
char *exps;
int nargs;
};
struct defn *lookup_define(char *);
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 incfnum;
int line;
char *file;
int slast, lastchar;
int pragma_strict_types;
int nbuf;
char *outp;
} *inctop = 0;
/* DEFMAX must be even. We divide it by 2 in mygetc(). */
#define DEFMAX 20000
static char defbuf[DEFMAX];
static int nbuf;
static char *outp;
static struct {
int token;
int line;
YYSTYPE lval;
} keep1, keep2, keep3, keep4;
static void
calculate_include_path(char *name, char *dest)
{
char *current;
if ( (current = strrchr(dest, '/')) == NULL) /* strip filename */
{
/* current_file is in the root directory */
current = dest;
}
*current = '\0';
while (*name == '/')
{
name++;
current = dest;
*current = '\0'; /* absolute path */
}
while (*name)
{
if (strncmp(name, "../", 3) == 0)
{
if (*dest == '\0') /* including from above mudlib is NOT allowed */
break;
/* Remove previous path element */
while (current > dest)
{
*current-- = '\0';
if (*current == '/')
break;
}
if (current == dest)
{
*current = '\0';
}
name += 3; /* skip "../" */
}
else if (strncmp(name, "./", 2) == 0)
{
name += 2;
}
else
{ /* append first component to dest */
if (*dest)
*current++ = '/'; /* only if dest is not empty !! */
while (*name != '\0' && *name != '/')
*current++ = *name++;
if (*name == '/')
name++;
else
*current = '\0'; /* Last element */
}
}
}
static INLINE int
mygetc(void)
{
if (!nbuf)
{
char buffer[(DEFMAX / 2) + 1];
if (feof(yyin))
{
return EOF;
}
nbuf = (int)fread(buffer, sizeof(char), (DEFMAX / 2), yyin);
if (!nbuf)
{
return EOF;
}
outp -= nbuf;
memcpy(outp, buffer, nbuf);
}
lastchar = slast;
slast = *outp;
nbuf--;
outp++;
return slast;
}
static INLINE int
gobble(int c)
{
int d;
d = mygetc();
if (c == d)
return 1;
*--outp = d;
nbuf++;
return 0;
}
__attribute__((format(printf, 1, 2)))
static void
lexerror(char *fmt, ...)
{
char buffer[1024];
va_list ap;
va_start(ap, fmt);
vsnprintf(buffer, sizeof(buffer), fmt, ap);
yyerror(buffer);
va_end(ap);
lex_fatal++;
}
static void
lexwarning(char *str)
{
(void)fprintf(stderr, "/%s: Warning: %s line %d\n", current_file, str,
current_line);
(void)fflush(stderr);
smart_log(current_file, current_line, str);
}
static int
skip_to(char *token, char *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;
/*(void)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
{
/*(void)fprintf(stderr, "skipping (%d) %c", c, c);*/
while (c != '\n' && c != EOF)
{
c = mygetc();
/*(void)fprintf(stderr, "%c", c);*/
}
if (c == EOF)
{
lexerror("Unexpected end of file while skipping");
return 1;
}
}
store_line_number_info(current_incfile, current_line);
current_line++;
total_lines++;
}
}
static void
handle_cond(int c)
{
struct ifstate *p;
/*(void)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)
{
store_line_number_info(current_incfile, current_line);
current_line++;
total_lines++;
}
}
/* Make sure the path does not have any ".." elements. */
char *
check_valid_compile_path(char *path, char *file_name, char *calling_function)
{
#if 0
struct svalue *ret;
#endif
char *p = path;
while (*p)
{
if (p[0] == '.' && p[1] == '.')
return NULL;
p++;
}
#if 0
push_string(path, STRING_MSTRING);
push_string(file_name, STRING_MSTRING);
push_string(calling_function, STRING_MSTRING);
ret = apply_master_ob(M_VALID_COMPILE_PATH, 3);
if (ret)
path = tmpstring_copy(ret->u.string);
#endif
return path;
}
/* Try to load the file who's full path is specified in buf */
static INLINE FILE *
inc_try(char *buf)
{
struct incstate *inc;
char errbuf[1024];
char *new_name;
FILE *f;
extern void remember_include(char *);
extern char *current_loaded_file;
new_name = check_valid_compile_path(buf, current_loaded_file, "include");
if (!new_name)
{
lexerror("Invalid include.");
return NULL;
}
if (new_name && (f = fopen(new_name, "r")) != NULL)
{
#ifdef WARN_INCLUDES
for (inc = inctop ; inc ; inc = inc->next)
if (strcmp(inc->file, new_name) == 0)
{
(void)snprintf(errbuf, sizeof(errbuf), "File /%s already included,", buf);
lexwarning(errbuf);
}
#endif
if (s_flag)
num_fileread++;
remember_include(new_name);
return f;
}
return NULL;
}
/* Find and open a file that has been specified in a "#include <file>" */
static INLINE FILE *
inc_open(char *buf, size_t len, char *name)
{
int i;
FILE *f;
if (incdepth >= MAX_INCLUDE)
{
lexerror("To deep recursion of includes.");
return NULL;
}
(void)strcpy(buf, current_file);
calculate_include_path(name, buf);
if ((f = inc_try(buf)) != NULL)
return f;
/*
* Search all include dirs specified.
*/
for (i = 0; i < inc_list_size; i++)
{
(void)snprintf(buf, len, "%s%s", inc_list[i], name);
if ((f = inc_try(buf)) != NULL)
return f;
}
return NULL;
}
int
handle_include(char *name, int ignore_errors)
{
char *p;
char buf[1024];
FILE *f;
struct incstate *is;
int delim;
if (*name != '"' && *name != '<')
{
struct defn *d;
if ((d = lookup_define(name)) && d->nargs == -1)
{
char *q;
q = d->exps;
while (isspace(*q))
q++;
return handle_include(q, ignore_errors);
}
else
{
if (!ignore_errors)
lexerror("Missing leading \" or < in #include");
return 0;
}
}
delim = *name++ == '"' ? '"' : '>';
for (p = name; *p && *p != delim; p++)
;
if (!*p)
{
if (!ignore_errors)
lexerror("Missing trailing \" or > in #include");
return 0;
}
if (strlen(name) > sizeof(buf) - 100)
{
if (!ignore_errors)
lexerror("Include name too long.");
return 0;
}
*p = 0;
if ((f = inc_open(buf, sizeof(buf), name)) == NULL)
{
if (!ignore_errors) {
lexerror("Cannot #include %s\n", name);
}
return 0;
}
is = (struct incstate *)xalloc(sizeof(struct incstate));
is->yyin = yyin;
is->line = current_line;
is->file = current_file;
is->incfnum = current_incfile;
is->slast = slast;
is->lastchar = lastchar;
is->next = inctop;
is->pragma_strict_types = pragma_strict_types;
if (nbuf)
{
memcpy(is->outp = (char *)xalloc(nbuf + 1), outp, nbuf);
is->nbuf = nbuf;
nbuf = 0;
outp = defbuf + DEFMAX;
}
else
{
is->nbuf = 0;
is->outp = NULL;
}
pragma_strict_types = 0;
inctop = is;
current_line = 1;
current_file = xalloc(strlen(buf)+1);
current_incfile = ++num_incfiles;
(void)strcpy(current_file, buf);
slast = lastchar = '\n';
yyin = f;
incdepth++;
return 1;
}
static void
handle_exception(int action, char *message)
{
char buf[1024];
(void)strcpy(buf, "\"");
if (strlen(message) < 2)
(void)strcat(buf, "Unspecified condition");
else
(void)strcat(buf, message);
(void)strcat(buf, "\"");
push_number(action);
push_string(buf, STRING_MSTRING);
push_number(current_line);
push_string(current_file, STRING_MSTRING);
(void)apply_master_ob(M_PARSE_EXCEPTION, 4);
if (action == ERROR)
lexerror("Parse aborted on #error statement,");
}
static void
skip_comment(void)
{
int c;
for (;;)
{
while ((c = mygetc()) != '*')
{
if (c == EOF)
{
lexerror("End of file in a comment");
return;
}
if (c == '\n')
{
nexpands=0;
store_line_number_info(current_incfile, current_line);
current_line++;
}
}
do
{
if ((c = mygetc()) == '/')
return;
if (c == '\n')
{
nexpands=0;
store_line_number_info(current_incfile, current_line);
current_line++;
}
} while (c == '*');
}
}
static void
skip_comment2(void)
{
int c;
while ((c = mygetc()) != '\n' && c != EOF)
;
if (c == EOF) {
lexerror("End of file in a // comment");
return;
}
nexpands=0;
store_line_number_info(current_incfile, current_line);
current_line++;
}
#define TRY(c, t) if (gobble(c)) return t
static void
deltrail(char *ap)
{
char *p = ap;
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(char *str)
{
if (strcmp(str, "strict_types") == 0)
pragma_strict_types = 1;
else if (strcmp(str, "save_binary") == 0)
;
else if (strcmp(str, "no_clone") == 0)
pragma_no_clone = 1;
else if (strcmp(str, "no_inherit") == 0)
pragma_no_inherit = 1;
else if (strcmp(str, "no_shadow") == 0)
pragma_no_shadow = 1;
else if (strcmp(str, "resident") == 0)
pragma_resident = 1;
else
handle_exception(WARNING, "Unknown pragma");
}
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. */
unsigned char arg_type1; /* Type of argument 1 */
unsigned char arg_type2; /* Type of argument 2 */
unsigned 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, },
{ "float", F_FLOAT, },
{ "for", F_FOR, },
{ "foreach", F_FOREACH, },
{ "function", F_FUNCTION, },
{ "if", F_IF, },
{ "inherit", F_INHERIT, },
{ "int", F_INT, },
{ "mapping", F_MAPPING, },
{ "mixed", F_MIXED, },
{ "nomask", F_NO_MASK, },
{ "object", F_OBJECT, },
{ "operator", F_OPERATOR, },
{ "parse_command", F_PARSE_COMMAND, },
{ "private", F_PRIVATE, },
{ "public", F_PUBLIC, },
{ "return", F_RETURN, },
{ "sscanf", F_SSCANF, },
{ "static", F_STATIC, },
{ "status", F_STATUS, },
{ "string", F_STRING_DECL, },
{ "switch", F_SWITCH, },
{ "throw", F_THROW },
{ "try", F_TRY, },
{ "varargs", F_VARARGS, },
{ "void", F_VOID, },
{ "while", F_WHILE, },
};
struct instr instrs[EFUN_LAST - EFUN_FIRST + 1];
static int
lookupword(char *s, struct keyword *words, int h)
{
int i, l, r;
l = 0;
for (;;)
{
i = (l + h) / 2;
r = strcmp(s, words[i].word);
if (r == 0)
return words[i].token;
else if (l == i)
return -1;
else if (r < 0)
h = i;
else
l = i;
}
}
static INLINE int
lookup_resword(char *s)
{
return lookupword(s, reswords, NELEM(reswords));
}
static int
yylex1(void)
{
register char *yyp;
register int c;
register int c1, c2;
for (;;)
{
if (lex_fatal)
{
return -1;
}
switch(c = mygetc())
{
case EOF:
if (inctop)
{
struct incstate *p;
p = inctop;
(void)fclose(yyin);
/*(void)fprintf(stderr, "popping to %s\n", p->file);*/
free(current_file);
nexpands = 0;
current_file = p->file;
current_line = p->line + 1;
current_incfile = p->incfnum;
pragma_strict_types = p->pragma_strict_types;
yyin = p->yyin;
slast = p->slast;
lastchar = p->lastchar;
inctop = p->next;
if (p->nbuf)
{
nbuf = p->nbuf;
outp = defbuf + DEFMAX - nbuf;
memcpy(outp, p->outp, nbuf);
free((char *)p->outp);
}
else
{
nbuf = 0;
outp = defbuf + DEFMAX;
}
store_line_number_info(current_incfile, current_line);
incdepth--;
free((char *)p);
break;
}
if (iftop)
{
struct ifstate *p = iftop;
lexerror(p->state == EXPECT_ENDIF ? "Missing #endif" : "Missing #else");
while (iftop)
{
p = iftop;
iftop = p->next;
free((char *)p);
}
}
return -1;
case '\n':
{
nexpands=0;
store_line_number_info(current_incfile, current_line);
current_line++;
total_lines++;
}
/* FALLTHROUGH */
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 F_MOD;
case '/':
if (gobble('*'))
{
skip_comment();
break;
}
else if (gobble('/'))
{
skip_comment2();
break;
}
TRY('=', F_DIV_EQ);
return c;
case '=':
TRY('=', F_EQ);
return c;
case ';':
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 '.':
if (gobble('.'))
{
if (gobble('.'))
return F_VARARG;
else
return F_RANGE;
}
return c;
case '#':
if (lastchar == '\n')
{
char *ssp = 0;
int quote;
yyp = yytext;
do
{
c = mygetc();
} while (isspace(c));
for (quote = 0;;)
{
if (c == '"')
quote ^= 1;
/*gc - handle comments cpp-like! 1.6.91 @@@*/
while (!quote && c == '/')
{
if (gobble('*'))
{
skip_comment();
c = mygetc();
}
else
break;
}
if (!ssp && isspace(c))
ssp = yyp;
if (c == '\n' || c == EOF)
break;
SAVEC;
c = mygetc();
}
if (ssp)
{
*ssp++ = 0;
while (isspace(*ssp))
ssp++;
}
else
{
ssp = yyp;
}
*yyp = 0;
if (strcmp("define", yytext) == 0)
{
handle_define(ssp);
}
else if (strcmp("if", yytext) == 0)
{
#if 0
short int nega=0; /*@@@ allow #if !VAR gc 1.6.91*/
if (*ssp=='!'){ ssp++; nega=1;}
if (isdigit(*ssp))
{
char *p;
long l;
l = strtol(ssp, &p, 10);
while (isspace(*p))
p++;
if (*p)
lexerror("Condition too complex in #if");
else
handle_cond(nega ? !(int)l : (int)l);
}
else if (isalunum(*ssp))
{
char *p = ssp;
while (isalunum(*p))
p++;
if (*p)
{
*p++ = 0;
while (isspace(*p))
p++;
}
if (*p)
lexerror("Condition too complex in #if");
else
{
struct defn *d;
d = lookup_define(ssp);
if (d)
{
handle_cond(nega ? !atoi(d->exps) : atoi(d->exps));/* a hack! */
}
else
{
handle_cond(nega?1:0); /* cpp-like gc*/
}
}
}
else
lexerror("Condition too complex in #if");
#else
int cond;
myungetc(0);
add_input(ssp);
cond = cond_get_exp(0);
if (mygetc())
{
lexerror("Condition too complex in #if");
while (mygetc())
;
}
else
handle_cond(cond);
#endif
}
else if (strcmp("ifdef", yytext) == 0)
{
deltrail(ssp);
handle_cond(lookup_define(ssp) != 0);
}
else if (strcmp("ifndef", yytext) == 0)
{
deltrail(ssp);
handle_cond(lookup_define(ssp) == 0);
}
else if (strcmp("else", yytext) == 0)
{
if (iftop && iftop->state == EXPECT_ELSE)