Category : C Source Code
Archive   : F2CSRC.ZIP
Filename : GRAM.HEA

/****************************************************************
Copyright 1990 by AT&T Bell Laboratories, 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 "p1defs.h"

static int nstars; /* Number of labels in an
alternate return CALL */
static int ndim;
static int vartype;
int new_dcl;
static ftnint varleng;
static struct Dims dims[MAXDIM+1];
static struct Labelblock *labarray[MAXLABLIST]; /* Labels in an alternate
return CALL */

/* The next two variables are used to verify that each statement might be reached
during runtime. lastwasbranch is tested only in the defintion of the
stat: nonterminal. */

int lastwasbranch = NO;
static int thiswasbranch = NO;
extern ftnint yystno;
extern flag intonly;
static chainp datastack;
extern long laststfcn, thisstno;
extern int can_include; /* for netlib */

ftnint convci();
Addrp nextdata();
expptr mklogcon(), mkaddcon(), mkrealcon(), mkstrcon(), mkbitcon();
expptr mkcxcon();
struct Listblock *mklist();
struct Listblock *mklist();
struct Impldoblock *mkiodo();
Extsym *comblock();
#define ESNULL (Extsym *)0
#define NPNULL (Namep)0
#define LBNULL (struct Listblock *)0
extern void freetemps(), make_param();

static void
pop_datastack() {
chainp d0 = datastack;
if (d0->datap)
curdtp = (chainp)d0->datap;
datastack = d0->nextp;
d0->nextp = 0;
frchain(&d0);
}

%}

/* Specify precedences and associativities. */

%union {
int ival;
ftnint lval;
char *charpval;
chainp chval;
tagptr tagval;
expptr expval;
struct Labelblock *labval;
struct Nameblock *namval;
struct Eqvchain *eqvval;
Extsym *extval;
}

%left SCOMMA
%nonassoc SCOLON
%right SEQUALS
%left SEQV SNEQV
%left SOR
%left SAND
%left SNOT
%nonassoc SLT SGT SLE SGE SEQ SNE
%left SCONCAT
%left SPLUS SMINUS
%left SSTAR SSLASH
%right SPOWER

%start program
%type thislabel label assignlabel
%type other inelt
%type type typespec typename dcl letter addop relop stop nameeq
%type lengspec
%type filename
%type datavar datavarlist namelistlist funarglist funargs
%type dospec dospecw
%type callarglist arglist args exprlist inlist outlist out2 substring
%type name arg call var
%type lhs expr uexpr opt_expr fexpr unpar_fexpr
%type ubound simple value callarg complex_const simple_const bit_const
%type common comblock entryname progname
%type equivlist

%%

program:
| program stat SEOS
;

stat: thislabel entry
{
/* stat: is the nonterminal for Fortran statements */

lastwasbranch = NO; }
| thislabel spec
| thislabel exec
{ /* forbid further statement function definitions... */
if (parstate == INDATA && laststfcn != thisstno)
parstate = INEXEC;
thisstno++;
if($1 && ($1->labelno==dorange))
enddo($1->labelno);
if(lastwasbranch && thislabel==NULL)
warn("statement cannot be reached");
lastwasbranch = thiswasbranch;
thiswasbranch = NO;
if($1)
{
if($1->labtype == LABFORMAT)
err("label already that of a format");
else
$1->labtype = LABEXEC;
}
freetemps();
}
| thislabel SINCLUDE filename
{ if (can_include)
doinclude( $3 );
else {
fprintf(diagfile, "Cannot open file %s\n", $3);
done(1);
}
}
| thislabel SEND end_spec
{ if ($1)
lastwasbranch = NO;
endproc(); /* lastwasbranch = NO; -- set in endproc() */
}
| thislabel SUNKNOWN
{ extern void unclassifiable();
unclassifiable();

/* flline flushes the current line, ignoring the rest of the text there */

flline(); };
| error
{ flline(); needkwd = NO; inioctl = NO;
yyerrok; yyclearin; }
;

thislabel: SLABEL
{
if(yystno != 0)
{
$$ = thislabel = mklabel(yystno);
if( ! headerdone ) {
if (procclass == CLUNKNOWN)
procclass = CLMAIN;
puthead(CNULL, procclass);
}
if(thislabel->labdefined)
execerr("label %s already defined",
convic(thislabel->stateno) );
else {
if(thislabel->blklevel!=0 && thislabel->blklevel && thislabel->labtype!=LABFORMAT)
warn1("there is a branch to label %s from outside block",
convic( (ftnint) (thislabel->stateno) ) );
thislabel->blklevel = blklevel;
thislabel->labdefined = YES;
if(thislabel->labtype != LABFORMAT)
p1_label((long)(thislabel - labeltab));
}
}
else $$ = thislabel = NULL;
}
;

entry: SPROGRAM new_proc progname
{startproc($3, CLMAIN); }
| SPROGRAM new_proc progname progarglist
{ warn("ignoring arguments to main program");
/* hashclear(); */
startproc($3, CLMAIN); }
| SBLOCK new_proc progname
{ if($3) NO66("named BLOCKDATA");
startproc($3, CLBLOCK); }
| SSUBROUTINE new_proc entryname arglist
{ entrypt(CLPROC, TYSUBR, (ftnint) 0, $3, $4); }
| SFUNCTION new_proc entryname arglist
{ entrypt(CLPROC, TYUNKNOWN, (ftnint) 0, $3, $4); }
| type SFUNCTION new_proc entryname arglist
{ entrypt(CLPROC, $1, varleng, $4, $5); }
| SENTRY entryname arglist
{ if(parstate==OUTSIDE || procclass==CLMAIN
|| procclass==CLBLOCK)
execerr("misplaced entry statement", CNULL);
entrypt(CLENTRY, 0, (ftnint) 0, $2, $3);
}
;

new_proc:
{ newproc(); }
;

entryname: name
{ $$ = newentry($1, 1); }
;

name: SNAME
{ $$ = mkname(token); }
;

progname: { $$ = NULL; }
| entryname
;

progarglist:
SLPAR SRPAR
| SLPAR progargs SRPAR
;

progargs: progarg
| progargs SCOMMA progarg
;

progarg: SNAME
| SNAME SEQUALS SNAME
;

arglist:
{ $$ = 0; }
| SLPAR SRPAR
{ NO66(" () argument list");
$$ = 0; }
| SLPAR args SRPAR
{$$ = $2; }
;

args: arg
{ $$ = ($1 ? mkchain((char *)$1,CHNULL) : CHNULL ); }
| args SCOMMA arg
{ if($3) $1 = $$ = mkchain((char *)$3, $1); }
;

arg: name
{ if($1->vstg!=STGUNKNOWN && $1->vstg!=STGARG)
dclerr("name declared as argument after use", $1);
$1->vstg = STGARG;
}
| SSTAR
{ NO66("altenate return argument");

/* substars means that '*'ed formal parameters should be replaced.
This is used to specify alternate return labels; in theory, only
parameter slots which have '*' should accept the statement labels.
This compiler chooses to ignore the '*'s in the formal declaration, and
always return the proper value anyway.

This variable is only referred to in proc.c */

$$ = 0; substars = YES; }
;



filename: SHOLLERITH
{
char *s;
s = copyn(toklen+1, token);
s[toklen] = '\0';
$$ = s;
}
;