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GLASS
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tmgram.c
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C/C++ Source or Header
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1991-02-14
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19KB
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799 lines
# line 2 "tmgram.y"
/* file: tmgram.y
A YACC grammar for Miranda algebraic datatypes
*/
#include "tmdefs.h"
#include <ctype.h>
#include <tmc.h>
#include "tmds.h"
#include "tmstring.h"
#include "debug.h"
#include "tmerror.h"
#include "tmglobal.h"
#include "tmlex.h"
#include "tmmisc.h"
extern void setlexfile();
#define YYDEBUG 1 /* allow compilation of debugging code */
ds_list ans;
# line 26 "tmgram.y"
typedef union {
ds pards;
ds_list pardslist;
constructor parcons;
constructor_list parconslist;
field parfield;
field_list parfieldlist;
char *parstring;
} YYSTYPE;
# define BAR 257
# define COLCOLEQ 258
# define EQEQ 259
# define COLON 260
# define COMMA 261
# define NAME 262
# define SEMI 263
# define LSBRAC 264
# define RSBRAC 265
# define LRBRAC 266
# define RRBRAC 267
#define yyclearin yychar = -1
#define yyerrok yyerrflag = 0
extern int yychar;
extern int yyerrflag;
#ifndef YYMAXDEPTH
#define YYMAXDEPTH 150
#endif
YYSTYPE yylval, yyval;
typedef int yytabelem;
# define YYERRCODE 256
# line 141 "tmgram.y"
static void yyerror( s )
char *s;
{
s = s; /* to stop complaints about unused arguments */
(void) sprintf( errpos, "%s(%d)", dsfilename, dslineno );
error( SYNTAXERR );
}
/* Check a name on underscores and give an error message if one is found */
static void ckunderscore( s )
char *s;
{
if( index( s, '_' ) != NULL ){
(void) sprintf( errpos, "%s(%d)", dsfilename, dslineno );
(void) strcpy( errarg, s );
error( NOUNDERSCORE );
}
}
/* Ensure that name 's' is a proper constructor name. */
static void ckconsname( s )
char *s;
{
if( s[0] == '\0' ) return;
ckunderscore( s );
if( !isupper( s[0] ) ){
(void) sprintf( errpos, "%s(%d)", dsfilename, dslineno );
(void) strcpy( errarg, s );
error( BADCONSNM );
}
}
/* Ensure that name 's' is a proper type name. */
static void cktypename( s )
char *s;
{
if( s[0] == '\0' ) return;
ckunderscore( s );
if( !islower( s[0] ) ){
(void) sprintf( errpos, "%s(%d)", dsfilename, dslineno );
(void) strcpy( errarg, s );
error( BADTYPENM );
}
}
/* Ensure that name 's' is a proper element name. */
static void ckelmname( s )
char *s;
{
if( s[0] == '\0' ) return;
ckunderscore( s );
}
/* Ensure that there are no double names in tuple with name 'nm'
* and fields 'fields'.
*/
static void cktuple( nm, fields )
string nm;
field_list fields;
{
register unsigned int ix; /* index of currently checked field */
register unsigned int iy; /* index of searched subsequent fields */
field fx; /* checked field */
field fy; /* searched field */
string fnm; /* name of currently checked field */
for( ix=0; ix<fields->sz; ix++ ){
fx = fields->arr[ix];
fnm = fx->sename;
iy = ix+1;
for( iy=ix+1; iy<fields->sz; iy++ ){
fy = fields->arr[iy];
if( strcmp( fy->sename, fnm ) == 0 ){
(void) sprintf( errpos, "in type '%s'", nm );
(void) sprintf( errarg, "'%s'", fnm );
error( DOUBLEFIELD );
}
}
}
}
/* Ensure that there are no double names in each of the constructors of
* constructor type with name 'nm' and constructors 'cons'.
*/
static void ckconstructor( nm, cons )
string nm;
constructor_list cons;
{
constructor conx;
constructor cony;
field_list fields;
register unsigned int cix; /* index in constructor list */
register unsigned int ix; /* index of currently checked field */
register unsigned int six; /* index for searching of fields/constr. */
field fx; /* checked field */
field fy; /* searched field */
string fnm; /* name of currently checked field */
string connm; /* name of current constructor */
for( cix=0; cix<cons->sz; cix++ ){
conx = cons->arr[cix];
fields = conx->confields;
connm = conx->conname;
for( six=cix+1; six<cons->sz; six++ ){
cony = cons->arr[six];
if( strcmp( cony->conname, connm ) == 0 ){
(void) sprintf( errpos, "in type '%s'", nm );
(void) sprintf( errarg, "'%s'", connm );
error( DOUBLECONS );
}
}
for( ix=0; ix<fields->sz; ix++ ){
fx = fields->arr[ix];
fnm = fx->sename;
six = ix+1;
for( six=ix+1; six<fields->sz; six++ ){
fy = fields->arr[six];
if( strcmp( fy->sename, fnm ) == 0 ){
(void) sprintf(
errpos,
"in type '%s', constructor '%s'",
nm,
connm
);
(void) sprintf( errarg, "'%s'", fnm );
error( DOUBLEFIELD );
}
}
}
}
}
/* top level of parser. */
ds_list parse( f )
FILE *f;
{
setlexfile( f );
(void) yyparse();
return( ans );
}
yytabelem yyexca[] ={
-1, 1,
0, -1,
-2, 0,
-1, 2,
0, 1,
-2, 0,
};
# define YYNPROD 19
# define YYLAST 45
yytabelem yyact[]={
25, 14, 32, 29, 16, 30, 24, 27, 9, 5,
15, 31, 21, 13, 26, 6, 7, 8, 19, 20,
11, 12, 4, 17, 18, 10, 3, 2, 1, 0,
0, 0, 0, 0, 0, 0, 23, 22, 0, 0,
0, 0, 0, 0, 28 };
yytabelem yypact[]={
-1000, -1000, -247, -1000, -242, -255, -1000, -249, -265, -1000,
-253, -1000, -1000, -1000, -250, -1000, -249, -250, -261, -1000,
-246, -1000, -1000, -1000, -256, -250, -259, -1000, -1000, -1000,
-251, -263, -1000 };
yytabelem yypgo[]={
0, 28, 27, 26, 25, 20, 24, 23, 18, 22,
21, 19 };
yytabelem yyr1[]={
0, 1, 2, 2, 3, 3, 3, 6, 6, 4,
4, 5, 7, 7, 8, 8, 9, 10, 11 };
yytabelem yyr2[]={
0, 3, 1, 5, 9, 13, 5, 3, 7, 3,
7, 5, 1, 5, 7, 11, 3, 3, 3 };
yytabelem yychk[]={
-1000, -1, -2, -3, -9, 256, 262, 258, 259, 263,
-4, -5, -10, 262, 266, 263, 257, -7, -6, -8,
-11, 262, -5, -8, 267, 261, 260, 263, -8, 262,
264, 262, 265 };
yytabelem yydef[]={
2, -2, -2, 3, 0, 0, 16, 0, 0, 6,
0, 9, 12, 17, 0, 4, 0, 11, 0, 7,
0, 18, 10, 13, 0, 0, 0, 5, 8, 14,
0, 0, 15 };
typedef struct { char *t_name; int t_val; } yytoktype;
#ifndef YYDEBUG
# define YYDEBUG 0 /* don't allow debugging */
#endif
#if YYDEBUG
yytoktype yytoks[] =
{
"BAR", 257,
"COLCOLEQ", 258,
"EQEQ", 259,
"COLON", 260,
"COMMA", 261,
"NAME", 262,
"SEMI", 263,
"LSBRAC", 264,
"RSBRAC", 265,
"LRBRAC", 266,
"RRBRAC", 267,
"-unknown-", -1 /* ends search */
};
char * yyreds[] =
{
"-no such reduction-",
"top : typelist",
"typelist : /* empty */",
"typelist : typelist type",
"type : typename COLCOLEQ constructorlist SEMI",
"type : typename EQEQ LRBRAC tuplebody RRBRAC SEMI",
"type : error SEMI",
"tuplebody : field",
"tuplebody : tuplebody COMMA field",
"constructorlist : constructor",
"constructorlist : constructorlist BAR constructor",
"constructor : consname fieldlist",
"fieldlist : /* empty */",
"fieldlist : fieldlist field",
"field : elmname COLON NAME",
"field : elmname COLON LSBRAC NAME RSBRAC",
"typename : NAME",
"consname : NAME",
"elmname : NAME",
};
#endif /* YYDEBUG */
/**********************************************************
* Copyright (C) Data General Corporation, 1984 - 1988 *
* All Rights Reserved. *
* Licensed Material-Property of Data General Corporation. *
**********************************************************/
/**************************************************
* This software is made available solely pursuant *
* to the terms of a DGC license *
* agreement which governs its use. *
**************************************************/
/* $What: <@(#) yaccpar.c,v 2.1.1.1> $ */
/* #ident "@(#)yacc:yaccpar 1.10" */
/*
** Skeleton parser driver for yacc output
*/
/*
** yacc user known macros and defines
*/
#define YYERROR goto yyerrlab
#define YYACCEPT return(0)
#define YYABORT return(1)
#define YYBACKUP( newtoken, newvalue )\
{\
if ( yychar >= 0 || ( yyr2[ yytmp ] >> 1 ) != 1 )\
{\
yyerror( "syntax error - cannot backup" );\
goto yyerrlab;\
}\
yychar = newtoken;\
yystate = *yyps;\
yylval = newvalue;\
goto yynewstate;\
}
#define YYRECOVERING() (!!yyerrflag)
#ifndef YYDEBUG
# define YYDEBUG 1 /* make debugging available */
#endif /* #ifndef YYDEBUG */
/*
** user known globals
*/
int yydebug; /* set to 1 to get debugging */
/*
** driver internal defines
*/
#define YYFLAG (-1000)
/*
** global variables used by the parser
*/
YYSTYPE yyv[ YYMAXDEPTH ]; /* value stack */
int yys[ YYMAXDEPTH ]; /* state stack */
YYSTYPE *yypv; /* top of value stack */
int *yyps; /* top of state stack */
int yystate; /* current state */
int yytmp; /* extra var (lasts between blocks) */
int yynerrs; /* number of errors */
int yyerrflag; /* error recovery flag */
int yychar; /* current input token number */
/*
** yyparse - return 0 if worked, 1 if syntax error not recovered from
*/
int
yyparse()
{
register YYSTYPE *yypvt; /* top of value stack for $vars */
/*
** Initialize externals - yyparse may be called more than once
*/
yypv = &yyv[-1];
yyps = &yys[-1];
yystate = 0;
yytmp = 0;
yynerrs = 0;
yyerrflag = 0;
yychar = -1;
goto yystack;
{
register YYSTYPE *yy_pv; /* top of value stack */
register int *yy_ps; /* top of state stack */
register int yy_state; /* current state */
register int yy_n; /* internal state number info */
/*
** get globals into registers.
** branch to here only if YYBACKUP was called.
*/
yynewstate:
yy_pv = yypv;
yy_ps = yyps;
yy_state = yystate;
goto yy_newstate;
/*
** get globals into registers.
** either we just started, or we just finished a reduction
*/
yystack:
yy_pv = yypv;
yy_ps = yyps;
yy_state = yystate;
/*
** top of for (;;) loop while no reductions done
*/
yy_stack:
/*
** put a state and value onto the stacks
*/
#if YYDEBUG
/*
** if debugging, look up token value in list of value vs.
** name pairs. 0 and negative (-1) are special values.
** Note: linear search is used since time is not a real
** consideration while debugging.
*/
if ( yydebug )
{
register int yy_i;
printf( "State %d, token ", yy_state );
if ( yychar == 0 )
printf( "end-of-file\n" );
else if ( yychar < 0 )
printf( "-none-\n" );
else
{
for ( yy_i = 0; yytoks[yy_i].t_val >= 0;
yy_i++ )
{
if ( yytoks[yy_i].t_val == yychar )
break;
}
printf( "%s\n", yytoks[yy_i].t_name );
}
}
#endif /* #if YYDEBUG */
if ( ++yy_ps >= &yys[ YYMAXDEPTH ] ) /* room on stack? */
{
yyerror( "yacc stack overflow" );
YYABORT;
}
*yy_ps = yy_state;
*++yy_pv = yyval;
/*
** we have a new state - find out what to do
*/
yy_newstate:
if ( ( yy_n = yypact[ yy_state ] ) <= YYFLAG )
goto yydefault; /* simple state */
#if YYDEBUG
/*
** if debugging, need to mark whether new token grabbed
*/
yytmp = yychar < 0;
#endif /* #if YYDEBUG */
if ( ( yychar < 0 ) && ( ( yychar = yylex() ) < 0 ) )
yychar = 0; /* reached EOF */
#if YYDEBUG
if ( yydebug && yytmp )
{
register int yy_i;
printf( "Received token " );
if ( yychar == 0 )
printf( "end-of-file\n" );
else if ( yychar < 0 )
printf( "-none-\n" );
else
{
for ( yy_i = 0; yytoks[yy_i].t_val >= 0;
yy_i++ )
{
if ( yytoks[yy_i].t_val == yychar )
break;
}
printf( "%s\n", yytoks[yy_i].t_name );
}
}
#endif /* #if YYDEBUG */
if ( ( ( yy_n += yychar ) < 0 ) || ( yy_n >= YYLAST ) )
goto yydefault;
if ( yychk[ yy_n = yyact[ yy_n ] ] == yychar ) /*valid shift*/
{
yychar = -1;
yyval = yylval;
yy_state = yy_n;
if ( yyerrflag > 0 )
yyerrflag--;
goto yy_stack;
}
yydefault:
if ( ( yy_n = yydef[ yy_state ] ) == -2 )
{
#if YYDEBUG
yytmp = yychar < 0;
#endif /* #if YYDEBUG */
if ( ( yychar < 0 ) && ( ( yychar = yylex() ) < 0 ) )
yychar = 0; /* reached EOF */
#if YYDEBUG
if ( yydebug && yytmp )
{
register int yy_i;
printf( "Received token " );
if ( yychar == 0 )
printf( "end-of-file\n" );
else if ( yychar < 0 )
printf( "-none-\n" );
else
{
for ( yy_i = 0;
yytoks[yy_i].t_val >= 0;
yy_i++ )
{
if ( yytoks[yy_i].t_val
== yychar )
{
break;
}
}
printf( "%s\n", yytoks[yy_i].t_name );
}
}
#endif /* #if YYDEBUG */
/*
** look through exception table
*/
{
register int *yyxi = yyexca;
while ( ( *yyxi != -1 ) ||
( yyxi[1] != yy_state ) )
{
yyxi += 2;
}
while ( ( *(yyxi += 2) >= 0 ) &&
( *yyxi != yychar ) )
;
if ( ( yy_n = yyxi[1] ) < 0 )
YYACCEPT;
}
}
/*
** check for syntax error
*/
if ( yy_n == 0 ) /* have an error */
{
/* no worry about speed here! */
switch ( yyerrflag )
{
case 0: /* new error */
yyerror( "syntax error" );
goto skip_init;
yyerrlab:
/*
** get globals into registers.
** we have a user generated syntax type error
*/
yy_pv = yypv;
yy_ps = yyps;
yy_state = yystate;
yynerrs++;
skip_init:
case 1:
case 2: /* incompletely recovered error */
/* try again... */
yyerrflag = 3;
/*
** find state where "error" is a legal
** shift action
*/
while ( yy_ps >= yys )
{
yy_n = yypact[ *yy_ps ] + YYERRCODE;
if ( yy_n >= 0 && yy_n < YYLAST &&
yychk[yyact[yy_n]] == YYERRCODE) {
/*
** simulate shift of "error"
*/
yy_state = yyact[ yy_n ];
goto yy_stack;
}
/*
** current state has no shift on
** "error", pop stack
*/
#if YYDEBUG
# define _POP_ "Error recovery pops state %d, uncovers state %d\n"
if ( yydebug )
printf( _POP_, *yy_ps,
yy_ps[-1] );
# undef _POP_
#endif /* #if YYDEBUG */
yy_ps--;
yy_pv--;
}
/*
** there is no state on stack with "error" as
** a valid shift. give up.
*/
YYABORT;
case 3: /* no shift yet; eat a token */
#if YYDEBUG
/*
** if debugging, look up token in list of
** pairs. 0 and negative shouldn't occur,
** but since timing doesn't matter when
** debugging, it doesn't hurt to leave the
** tests here.
*/
if ( yydebug )
{
register int yy_i;
printf( "Error recovery discards " );
if ( yychar == 0 )
printf( "token end-of-file\n" );
else if ( yychar < 0 )
printf( "token -none-\n" );
else
{
for ( yy_i = 0;
yytoks[yy_i].t_val >= 0;
yy_i++ )
{
if ( yytoks[yy_i].t_val
== yychar )
{
break;
}
}
printf( "token %s\n",
yytoks[yy_i].t_name );
}
}
#endif /* #if YYDEBUG */
if ( yychar == 0 ) /* reached EOF. quit */
YYABORT;
yychar = -1;
goto yy_newstate;
}
}/* end if ( yy_n == 0 ) */
/*
** reduction by production yy_n
** put stack tops, etc. so things right after switch
*/
#if YYDEBUG
/*
** if debugging, print the string that is the user's
** specification of the reduction which is just about
** to be done.
*/
if ( yydebug )
printf( "Reduce by (%d) \"%s\"\n",
yy_n, yyreds[ yy_n ] );
#endif /* #if YYDEBUG */
yytmp = yy_n; /* value to switch over */
yypvt = yy_pv; /* $vars top of value stack */
/*
** Look in goto table for next state
** Sorry about using yy_state here as temporary
** register variable, but why not, if it works...
** If yyr2[ yy_n ] doesn't have the low order bit
** set, then there is no action to be done for
** this reduction. So, no saving & unsaving of
** registers done. The only difference between the
** code just after the if and the body of the if is
** the goto yy_stack in the body. This way the test
** can be made before the choice of what to do is needed.
*/
{
/* length of production doubled with extra bit */
register int yy_len = yyr2[ yy_n ];
if ( !( yy_len & 01 ) )
{
yy_len >>= 1;
yyval = ( yy_pv -= yy_len )[1]; /* $$ = $1 */
yy_state = yypgo[ yy_n = yyr1[ yy_n ] ] +
*( yy_ps -= yy_len ) + 1;
if ( yy_state >= YYLAST ||
yychk[ yy_state =
yyact[ yy_state ] ] != -yy_n )
{
yy_state = yyact[ yypgo[ yy_n ] ];
}
goto yy_stack;
}
yy_len >>= 1;
yyval = ( yy_pv -= yy_len )[1]; /* $$ = $1 */
yy_state = yypgo[ yy_n = yyr1[ yy_n ] ] +
*( yy_ps -= yy_len ) + 1;
if ( yy_state >= YYLAST ||
yychk[ yy_state = yyact[ yy_state ] ] != -yy_n )
{
yy_state = yyact[ yypgo[ yy_n ] ];
}
}
/* save until reenter driver code */
yystate = yy_state;
yyps = yy_ps;
yypv = yy_pv;
}
/*
** code supplied by user is placed in this switch
*/
switch( yytmp )
{
case 1:
# line 62 "tmgram.y"
{ ans = yypvt[-0].pardslist; } break;
case 2:
# line 65 "tmgram.y"
{ yyval.pardslist = new_ds_list(); } break;
case 3:
# line 66 "tmgram.y"
{ app_ds_list( yypvt[-1].pardslist, yypvt[-0].pards ); yyval.pardslist = yypvt[-1].pardslist; } break;
case 4:
# line 71 "tmgram.y"
{
ckconstructor( yypvt[-3].parstring, yypvt[-1].parconslist );
yyval.pards = new_DsCons( yypvt[-3].parstring, yypvt[-1].parconslist );
} break;
case 5:
# line 76 "tmgram.y"
{
cktuple( yypvt[-5].parstring, yypvt[-2].parfieldlist );
yyval.pards = new_DsTuple( yypvt[-5].parstring, yypvt[-2].parfieldlist );
} break;
case 6:
# line 81 "tmgram.y"
{
yyval.pards = new_DsCons( new_string( "" ), new_constructor_list() );
} break;
case 7:
# line 88 "tmgram.y"
{
yyval.parfieldlist = new_field_list();
app_field_list( yyval.parfieldlist, yypvt[-0].parfield );
} break;
case 8:
# line 93 "tmgram.y"
{
app_field_list( yypvt[-2].parfieldlist, yypvt[-0].parfield );
yyval.parfieldlist = yypvt[-2].parfieldlist;
} break;
case 9:
# line 101 "tmgram.y"
{
yyval.parconslist = new_constructor_list();
app_constructor_list( yyval.parconslist, yypvt[-0].parcons );
} break;
case 10:
# line 106 "tmgram.y"
{
app_constructor_list(yypvt[-2].parconslist, yypvt[-0].parcons);
yyval.parconslist = yypvt[-2].parconslist;
} break;
case 11:
# line 114 "tmgram.y"
{
yyval.parcons = new_constructor(yypvt[-1].parstring, yypvt[-0].parfieldlist);
} break;
case 12:
# line 120 "tmgram.y"
{ yyval.parfieldlist = new_field_list(); } break;
case 13:
# line 121 "tmgram.y"
{ app_field_list(yypvt[-1].parfieldlist, yypvt[-0].parfield); yyval.parfieldlist = yypvt[-1].parfieldlist; } break;
case 14:
# line 125 "tmgram.y"
{ yyval.parfield = new_field( 0, yypvt[-2].parstring, yypvt[-0].parstring ); } break;
case 15:
# line 126 "tmgram.y"
{ yyval.parfield = new_field( 1, yypvt[-4].parstring, yypvt[-1].parstring ); } break;
case 16:
# line 130 "tmgram.y"
{ cktypename( yypvt[-0].parstring ); yyval.parstring = yypvt[-0].parstring; } break;
case 17:
# line 134 "tmgram.y"
{ ckconsname( yypvt[-0].parstring ); yyval.parstring = yypvt[-0].parstring; } break;
case 18:
# line 138 "tmgram.y"
{ ckelmname( yypvt[-0].parstring ); yyval.parstring = yypvt[-0].parstring; } break;
}
goto yystack; /* reset registers in driver code */
}