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lex.c
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/****************************************************************
Copyright 1990, 1992, 1993 by AT&T Bell Laboratories and Bellcore.
Permission to use, copy, modify, and distribute this software
and its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the names of AT&T Bell Laboratories or
Bellcore or any of their entities not be used in advertising or
publicity pertaining to distribution of the software without
specific, written prior permission.
AT&T and Bellcore disclaim all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall AT&T or Bellcore be liable for
any special, indirect or consequential damages or any damages
whatsoever resulting from loss of use, data or profits, whether
in an action of contract, negligence or other tortious action,
arising out of or in connection with the use or performance of
this software.
****************************************************************/
#include "defs.h"
#include "tokdefs.h"
#include "p1defs.h"
#ifdef NO_EOF_CHAR_CHECK
#undef EOF_CHAR
#else
#ifndef EOF_CHAR
#define EOF_CHAR 26 /* ASCII control-Z */
#endif
#endif
#define BLANK ' '
#define MYQUOTE (2)
#define SEOF 0
/* card types */
#define STEOF 1
#define STINITIAL 2
#define STCONTINUE 3
/* lex states */
#define NEWSTMT 1
#define FIRSTTOKEN 2
#define OTHERTOKEN 3
#define RETEOS 4
LOCAL int stkey; /* Type of the current statement (DO, END, IF, etc) */
extern char token[]; /* holds the actual token text */
static int needwkey;
ftnint yystno;
flag intonly;
extern int new_dcl;
LOCAL long int stno;
LOCAL long int nxtstno; /* Statement label */
LOCAL int parlev; /* Parentheses level */
LOCAL int parseen;
LOCAL int expcom;
LOCAL int expeql;
LOCAL char *nextch;
LOCAL char *lastch;
LOCAL char *nextcd = NULL;
LOCAL char *endcd;
LOCAL long prevlin;
LOCAL long thislin;
LOCAL int code; /* Card type; INITIAL, CONTINUE or EOF */
LOCAL int lexstate = NEWSTMT;
LOCAL char *sbuf; /* Main buffer for Fortran source input. */
LOCAL char *send; /* Was = sbuf+20*66 with sbuf[1390]. */
LOCAL int maxcont;
LOCAL int nincl = 0; /* Current number of include files */
LOCAL long firstline;
LOCAL char *laststb, *stb0;
extern int addftnsrc;
static char **linestart;
LOCAL int ncont;
LOCAL char comstart[Table_size];
#define USC (unsigned char *)
static char anum_buf[Table_size];
#define isalnum_(x) anum_buf[x]
#define isalpha_(x) (anum_buf[x] == 1)
#define COMMENT_BUF_STORE 4088
typedef struct comment_buf {
struct comment_buf *next;
char *last;
char buf[COMMENT_BUF_STORE];
} comment_buf;
static comment_buf *cbfirst, *cbcur;
static char *cbinit, *cbnext, *cblast;
static void flush_comments();
extern flag use_bs;
/* Comment buffering data
Comments are kept in a list until the statement before them has
been parsed. This list is implemented with the above comment_buf
structure and the pointers cbnext and cblast.
The comments are stored with terminating NULL, and no other
intervening space. The last few bytes of each block are likely to
remain unused.
*/
/* struct Inclfile holds the state information for each include file */
struct Inclfile
{
struct Inclfile *inclnext;
FILEP inclfp;
char *inclname;
int incllno;
char *incllinp;
int incllen;
int inclcode;
ftnint inclstno;
};
LOCAL struct Inclfile *inclp = NULL;
struct Keylist {
char *keyname;
int keyval;
char notinf66;
};
struct Punctlist {
char punchar;
int punval;
};
struct Fmtlist {
char fmtchar;
int fmtval;
};
struct Dotlist {
char *dotname;
int dotval;
};
LOCAL struct Keylist *keystart[26], *keyend[26];
/* KEYWORD AND SPECIAL CHARACTER TABLES
*/
static struct Punctlist puncts[ ] =
{
'(', SLPAR,
')', SRPAR,
'=', SEQUALS,
',', SCOMMA,
'+', SPLUS,
'-', SMINUS,
'*', SSTAR,
'/', SSLASH,
'$', SCURRENCY,
':', SCOLON,
'<', SLT,
'>', SGT,
0, 0 };
LOCAL struct Dotlist dots[ ] =
{
"and.", SAND,
"or.", SOR,
"not.", SNOT,
"true.", STRUE,
"false.", SFALSE,
"eq.", SEQ,
"ne.", SNE,
"lt.", SLT,
"le.", SLE,
"gt.", SGT,
"ge.", SGE,
"neqv.", SNEQV,
"eqv.", SEQV,
0, 0 };
LOCAL struct Keylist keys[ ] =
{
{ "assign", SASSIGN },
{ "automatic", SAUTOMATIC, YES },
{ "backspace", SBACKSPACE },
{ "blockdata", SBLOCK },
{ "call", SCALL },
{ "character", SCHARACTER, YES },
{ "close", SCLOSE, YES },
{ "common", SCOMMON },
{ "complex", SCOMPLEX },
{ "continue", SCONTINUE },
{ "data", SDATA },
{ "dimension", SDIMENSION },
{ "doubleprecision", SDOUBLE },
{ "doublecomplex", SDCOMPLEX, YES },
{ "elseif", SELSEIF, YES },
{ "else", SELSE, YES },
{ "endfile", SENDFILE },
{ "endif", SENDIF, YES },
{ "enddo", SENDDO, YES },
{ "end", SEND },
{ "entry", SENTRY, YES },
{ "equivalence", SEQUIV },
{ "external", SEXTERNAL },
{ "format", SFORMAT },
{ "function", SFUNCTION },
{ "goto", SGOTO },
{ "implicit", SIMPLICIT, YES },
{ "include", SINCLUDE, YES },
{ "inquire", SINQUIRE, YES },
{ "intrinsic", SINTRINSIC, YES },
{ "integer", SINTEGER },
{ "logical", SLOGICAL },
{ "namelist", SNAMELIST, YES },
{ "none", SUNDEFINED, YES },
{ "open", SOPEN, YES },
{ "parameter", SPARAM, YES },
{ "pause", SPAUSE },
{ "print", SPRINT },
{ "program", SPROGRAM, YES },
{ "punch", SPUNCH, YES },
{ "read", SREAD },
{ "real", SREAL },
{ "return", SRETURN },
{ "rewind", SREWIND },
{ "save", SSAVE, YES },
{ "static", SSTATIC, YES },
{ "stop", SSTOP },
{ "subroutine", SSUBROUTINE },
{ "then", STHEN, YES },
{ "undefined", SUNDEFINED, YES },
{ "while", SWHILE, YES },
{ "write", SWRITE },
{ 0, 0 }
};
LOCAL void analyz(), crunch(), store_comment();
LOCAL int getcd(), getcds(), getkwd(), gettok();
LOCAL char *stbuf[3];
inilex(name)
char *name;
{
stbuf[0] = Alloc(3*P1_STMTBUFSIZE);
stbuf[1] = stbuf[0] + P1_STMTBUFSIZE;
stbuf[2] = stbuf[1] + P1_STMTBUFSIZE;
nincl = 0;
inclp = NULL;
doinclude(name);
lexstate = NEWSTMT;
return(NO);
}
/* throw away the rest of the current line */
flline()
{
lexstate = RETEOS;
}
char *lexline(n)
int *n;
{
*n = (lastch - nextch) + 1;
return(nextch);
}
doinclude(name)
char *name;
{
FILEP fp;
struct Inclfile *t;
char *lastslash, *s, *s0, *temp;
int k;
if(inclp)
{
inclp->incllno = thislin;
inclp->inclcode = code;
inclp->inclstno = nxtstno;
if(nextcd)
inclp->incllinp = copyn(inclp->incllen = endcd-nextcd , nextcd);
else
inclp->incllinp = 0;
}
nextcd = NULL;
if(++nincl >= MAXINCLUDES)
Fatal("includes nested too deep");
if(name[0] == '\0')
fp = stdin;
else if(name[0] == '/' || inclp == NULL
#ifdef MSDOS
|| name[0] == '\\'
|| name[1] == ':'
#endif
)
fp = fopen(name, textread);
else {
lastslash = NULL;
s = s0 = inclp->inclname;
#ifdef MSDOS
if (s[1] == ':')
lastslash = s + 1;
#endif
for(; *s ; ++s)
if(*s == '/'
#ifdef MSDOS
|| *s == '\\'
#endif
)
lastslash = s;
if(lastslash) {
k = lastslash - s0 + 1;
temp = Alloc(k + strlen(name) + 1);
strncpy(temp, s0, k);
strcpy(temp+k, name);
name = temp;
}
fp = fopen(name, textread);
}
if (fp)
{
t = inclp;
inclp = ALLOC(Inclfile);
inclp->inclnext = t;
prevlin = thislin = 0;
infname = inclp->inclname = name;
infile = inclp->inclfp = fp;
}
else
{
fprintf(diagfile, "Cannot open file %s\n", name);
done(1);
}
}
LOCAL popinclude()
{
struct Inclfile *t;
register char *p;
register int k;
if(infile != stdin)
clf(&infile, infname, 1); /* Close the input file */
free(infname);
--nincl;
t = inclp->inclnext;
free( (charptr) inclp);
inclp = t;
if(inclp == NULL) {
infname = 0;
return(NO);
}
infile = inclp->inclfp;
infname = inclp->inclname;
prevlin = thislin = inclp->incllno;
code = inclp->inclcode;
stno = nxtstno = inclp->inclstno;
if(inclp->incllinp)
{
endcd = nextcd = sbuf;
k = inclp->incllen;
p = inclp->incllinp;
while(--k >= 0)
*endcd++ = *p++;
free( (charptr) (inclp->incllinp) );
}
else
nextcd = NULL;
return(YES);
}
static char *lastfile = "??", *lastfile0 = "?";
static char fbuf[P1_FILENAME_MAX];
void p1_line_number (line_number)
long line_number;
{
if (lastfile != lastfile0) {
p1puts(P1_FILENAME, fbuf);
lastfile0 = lastfile;
}
fprintf(pass1_file, "%d: %ld\n", P1_SET_LINE, line_number);
}
static void
putlineno()
{
static long lastline;
extern int gflag;
register char *s0, *s1;
if (gflag) {
if (lastline)
p1_line_number(lastline);
lastline = firstline;
if (lastfile != infname)
if (lastfile = infname) {
strncpy(fbuf, lastfile, sizeof(fbuf));
fbuf[sizeof(fbuf)-1] = 0;
}
else
fbuf[0] = 0;
}
if (addftnsrc) {
if (laststb && *laststb) {
for(s1 = laststb; *s1; s1++) {
for(s0 = s1; *s1 != '\n'; s1++)
if (*s1 == '*' && s1[1] == '/')
*s1 = '+';
*s1 = 0;
p1puts(P1_FORTRAN, s0);
}
*laststb = 0; /* prevent trouble after EOF */
}
laststb = stb0;
}
}
yylex()
{
static int tokno;
int retval;
switch(lexstate)
{
case NEWSTMT : /* need a new statement */
retval = getcds();
putlineno();
if(retval == STEOF) {
retval = SEOF;
break;
} /* if getcds() == STEOF */
crunch();
tokno = 0;
lexstate = FIRSTTOKEN;
yystno = stno;
stno = nxtstno;
toklen = 0;
retval = SLABEL;
break;
first:
case FIRSTTOKEN : /* first step on a statement */
analyz();
lexstate = OTHERTOKEN;
tokno = 1;
retval = stkey;
break;
case OTHERTOKEN : /* return next token */
if(nextch > lastch)
goto reteos;
++tokno;
if( (stkey==SLOGIF || stkey==SELSEIF) && parlev==0 && tokno>3)
goto first;
if(stkey==SASSIGN && tokno==3 && nextch<lastch &&
nextch[0]=='t' && nextch[1]=='o')
{
nextch+=2;
retval = STO;
break;
}
retval = gettok();
break;
reteos:
case RETEOS:
lexstate = NEWSTMT;
retval = SEOS;
break;
default:
fatali("impossible lexstate %d", lexstate);
break;
}
if (retval == SEOF)
flush_comments ();
return retval;
}
LOCAL void
contmax()
{
lineno = thislin;
many("continuation lines", 'C', maxcontin);
}
/* Get Cards.
Returns STEOF or STINITIAL, never STCONTINUE. Any continuation cards get
merged into one long card (hence the size of the buffer named sbuf) */
LOCAL int
getcds()
{
register char *p, *q;
flush_comments ();
top:
if(nextcd == NULL)
{
code = getcd( nextcd = sbuf, 1 );
stno = nxtstno;
prevlin = thislin;
}
if(code == STEOF)
if( popinclude() )
goto top;
else
return(STEOF);
if(code == STCONTINUE)
{
lineno = thislin;
nextcd = NULL;
goto top;
}
/* Get rid of unused space at the head of the buffer */
if(nextcd > sbuf)
{
q = nextcd;
p = sbuf;
while(q < endcd)
*p++ = *q++;
endcd = p;
}
/* Be aware that the input (i.e. the string at the address nextcd) is NOT
NULL-terminated */
/* This loop merges all continuations into one long statement, AND puts the next
card to be read at the end of the buffer (i.e. it stores the look-ahead card
when there's room) */
ncont = 0;
for(;;) {
nextcd = endcd;
if (ncont >= maxcont || nextcd+66 > send)
contmax();
linestart[ncont++] = nextcd;
if ((code = getcd(nextcd,0)) != STCONTINUE)
break;
if (ncont == 20 && noextflag) {
lineno = thislin;
errext("more than 19 continuation lines");
}
}
nextch = sbuf;
lastch = nextcd - 1;
lineno = prevlin;
prevlin = thislin;
return(STINITIAL);
}
static void
bang(a,b,c,d,e) /* save ! comments */
char *a, *b, *c;
register char *d, *e;
{
char buf[COMMENT_BUFFER_SIZE + 1];
register char *p, *pe;
p = buf;
pe = buf + COMMENT_BUFFER_SIZE;
*pe = 0;
while(a < b)
if (!(*p++ = *a++))
p[-1] = 0;
if (b < c)
*p++ = '\t';
while(d < e) {
if (!(*p++ = *d++))
p[-1] = ' ';
if (p == pe) {
store_comment(buf);
p = buf;
}
}
if (p > buf) {
while(--p >= buf && *p == ' ');
p[1] = 0;
store_comment(buf);
}
}
/* getcd - Get next input card
This function reads the next input card from global file pointer infile.
It assumes that b points to currently empty storage somewhere in sbuf */
LOCAL int
getcd(b, nocont)
register char *b;
{
register int c;
register char *p, *bend;
int speclin; /* Special line - true when the line is allowed
to have more than 66 characters (e.g. the
"&" shorthand for continuation, use of a "\t"
to skip part of the label columns) */
static char a[6]; /* Statement label buffer */
static char *aend = a+6;
static char *stb, *stbend;
static int nst;
char *atend, *endcd0;
extern int warn72;
char buf72[24];
int amp, i;
char storage[COMMENT_BUFFER_SIZE + 1];
char *pointer;
long L;
top:
endcd = b;
bend = b+66;
amp = speclin = NO;
atend = aend;
/* Handle the continuation shorthand of "&" in the first column, which stands
for " x" */
if( (c = getc(infile)) == '&')
{
a[0] = c;
a[1] = 0;
a[5] = 'x';
amp = speclin = YES;
bend = send;
p = aend;
}
/* Handle the Comment cards (a 'C', 'c', '*', or '!' in the first column). */
else if(comstart[c & 0xfff])
{
if (feof (infile)
#ifdef EOF_CHAR
|| c == EOF_CHAR
#endif
)
return STEOF;
if (c == '#') {
*endcd++ = c;
while((c = getc(infile)) != '\n')
if (c == EOF)
return STEOF;
else if (endcd < bend)
*endcd++ = c;
++thislin;
*endcd = 0;
if (b[1] == ' ')
p = b + 2;
else if (!strncmp(b,"#line ",6))
p = b + 6;
else {
bad_cpp:
errstr("Bad # line: \"%s\"", b);
goto top;
}
if (*p < '1' || *p > '9')
goto bad_cpp;
L = *p - '1'; /* bias down 1 */
while((c = *++p) >= '0' && c <= '9')
L = 10*L + c - '0';
if (c != ' ' || *++p != '"')
goto bad_cpp;
bend = p;
while(*++p != '"')
if (!*p)
goto bad_cpp;
*p = 0;
i = p - bend++;
thislin = L;
if (!infname || strcmp(infname, bend)) {
if (infname)
free(infname);
infname = Alloc(i);
strcpy(infname, bend);
if (inclp)
inclp->inclname = infname;
}
goto top;
}
storage[COMMENT_BUFFER_SIZE] = c = '\0';
pointer = storage;
while( !feof (infile) && (*pointer++ = c = getc(infile)) != '\n') {
/* Handle obscure end of file conditions on many machines */
if (feof (infile) && (c == '\377' || c == EOF)) {
pointer--;
break;
} /* if (feof (infile)) */
if (c == '\0')
*(pointer - 1) = ' ';
if (pointer == &storage[COMMENT_BUFFER_SIZE]) {
store_comment (storage);
pointer = storage;
} /* if (pointer == BUFFER_SIZE) */
} /* while */
if (pointer > storage) {
if (c == '\n')
/* Get rid of the newline */
pointer[-1] = 0;
else
*pointer = 0;
store_comment (storage);
} /* if */
if (feof (infile))
if (c != '\n') /* To allow the line index to
increment correctly */
return STEOF;
++thislin;
goto top;
}
else if(c != EOF)
{
/* Load buffer a with the statement label */
/* a tab in columns 1-6 skips to column 7 */
ungetc(c, infile);
for(p=a; p<aend && (c=getc(infile)) != '\n' && c!=EOF; )
if(c == '\t')
/* The tab character translates into blank characters in the statement label */
{
atend = p;
while(p < aend)
*p++ = BLANK;
speclin = YES;
bend = send;
}
else
*p++ = c;
}
/* By now we've read either a continuation character or the statement label
field */
if(c == EOF)
return(STEOF);
/* The next 'if' block handles lines that have fewer than 7 characters */
if(c == '\n')
{
while(p < aend)
*p++ = BLANK;
/* Blank out the buffer on lines which are not longer than 66 characters */
endcd0 = endcd;
if( ! speclin )
while(endcd < bend)
*endcd++ = BLANK;
}
else { /* read body of line */
if (warn72 & 2) {
speclin = YES;
bend = send;
}
while( endcd<bend && (c=getc(infile)) != '\n' && c!=EOF )
*endcd++ = c;
if(c == EOF)
return(STEOF);
/* Drop any extra characters on the input card; this usually means those after
column 72 */
if(c != '\n')
{
i = 0;
while( (c=getc(infile)) != '\n' && c != EOF)
if (i < 23)
buf72[i++] = c;
if (warn72 && i && !speclin) {
buf72[i] = 0;
if (i >= 23)
strcpy(buf72+20, "...");
lineno = thislin + 1;
errstr("text after column 72: %s", buf72);
}
if(c == EOF)
return(STEOF);
}
endcd0 = endcd;
if( ! speclin )
while(endcd < bend)
*endcd++ = BLANK;
}
/* The flow of control usually gets to this line (unless an earlier RETURN has
been taken) */
++thislin;
/* Fortran 77 specifies that a 0 in column 6 */
/* does not signify continuation */
if( !isspace(a[5]) && a[5]!='0') {
if (!amp)
for(p = a; p < aend;)
if (*p++ == '!' && p != aend)
goto initcheck;
if (addftnsrc && stb) {
if (stbend > stb + 7) { /* otherwise forget col 1-6 */
/* kludge around funny p1gets behavior */
*stb++ = '$';
if (amp)
*stb++ = '&';
else
for(p = a; p < atend;)
*stb++ = *p++;
}
if (endcd0 - b > stbend - stb) {
if (stb > stbend)
stb = stbend;
endcd0 = b + (stbend - stb);
}
for(p = b; p < endcd0;)
*stb++ = *p++;
*stb++ = '\n';
*stb = 0;
}
if (nocont) {
lineno = thislin;
errstr("illegal continuation card (starts \"%.6s\")",a);
}
else if (!amp && strncmp(a," ",5)) {
lineno = thislin;
errstr("labeled continuation line (starts \"%.6s\")",a);
}
return(STCONTINUE);
}
initcheck:
for(p=a; p<atend; ++p)
if( !isspace(*p) ) {
if (*p++ != '!')
goto initline;
bang(p, atend, aend, b, endcd);
goto top;
}
for(p = b ; p<endcd ; ++p)
if( !isspace(*p) ) {
if (*p++ != '!')
goto initline;
bang(a, a, a, p, endcd);
goto top;
}
/* Skip over blank cards by reading the next one right away */
goto top;
initline:
if (addftnsrc) {
nst = (nst+1)%3;
if (!laststb && stb0)
laststb = stb0;
stb0 = stb = stbuf[nst];
*stb++ = '$'; /* kludge around funny p1gets behavior */
stbend = stb + sizeof(stbuf[0])-2;
for(p = a; p < atend;)
*stb++ = *p++;
if (atend < aend)
*stb++ = '\t';
for(p = b; p < endcd0;)
*stb++ = *p++;
*stb++ = '\n';
*stb = 0;
}
/* Set nxtstno equal to the integer value of the statement label */
nxtstno = 0;
bend = a + 5;
for(p = a ; p < bend ; ++p)
if( !isspace(*p) )
if(isdigit(*p))
nxtstno = 10*nxtstno + (*p - '0');
else if (*p == '!') {
if (!addftnsrc)
bang(p+1,atend,aend,b,endcd);
endcd = b;
break;
}
else {
lineno = thislin;
errstr(
"nondigit in statement label field \"%.5s\"", a);
nxtstno = 0;
break;
}
firstline = thislin;
return(STINITIAL);
}
/* crunch -- deletes all space characters, folds the backslash chars and
Hollerith strings, quotes the Fortran strings */
LOCAL void
crunch()
{
register char *i, *j, *j0, *j1, *prvstr;
int k, ten, nh, nh0, quote;
/* i is the next input character to be looked at
j is the next output character */
new_dcl = needwkey = parlev = parseen = 0;
expcom = 0; /* exposed ','s */
expeql = 0; /* exposed equal signs */
j = sbuf;
prvstr = sbuf;
k = 0;
for(i=sbuf ; i<=lastch ; ++i)
{
if(isspace(*i) )
continue;
if (*i == '!') {
while(i >= linestart[k])
if (++k >= maxcont)
contmax();
j0 = linestart[k];
if (!addftnsrc)
bang(sbuf,sbuf,sbuf,i+1,j0);
i = j0-1;
continue;
}
/* Keep everything in a quoted string */
if(*i=='\'' || *i=='"')
{
int len = 0;
quote = *i;
*j = MYQUOTE; /* special marker */
for(;;)
{
if(++i > lastch)
{
err("unbalanced quotes; closing quote supplied");
if (j >= lastch)
j = lastch - 1;
break;
}
if(*i == quote)
if(i<lastch && i[1]==quote) ++i;
else break;
else if(*i=='\\' && i<lastch && use_bs) {
++i;
*i = escapes[*(unsigned char *)i];
}
if (len < MAXTOKENLEN)
*++j = *i;
else if (len == MAXTOKENLEN)
erri
("String too long, truncating to %d chars", MAXTOKENLEN);
len++;