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Digital-Research-Source-Code/CPM OPERATING SYSTEMS/CPM 68K/1.0X SOURCES/v101/c/fparser/decl.c
Sepp J Morris 31738079c4 Upload 
Digital Research
2020-11-06 18:50:37 +01:00

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/*
Copyright 1982
Alcyon Corporation
8716 Production Ave.
San Diego, Ca. 92121
*/
#include "parser.h"
#define DTSIZE 077 /*data size in bytes*/
#define DREG 0100 /*data loadable into D-register?*/
char dinfo[] {
0, /*TYPELESS=0*/
1|DREG, /*CHAR=1*/
2|DREG, /*SHORT=2*/
2|DREG, /*INT=3*/
4|DREG, /*LONG=4*/
1|DREG, /*UCHAR=5*/
2|DREG, /*USHORT=6*/
2|DREG, /*UNSIGNED=7*/
4|DREG, /*ULONG=8*/
4|DREG, /*FLOAT=9[vlh]*/
4|DREG, /*DOUBLE=10[vlh]*/
0, /*STRUCT=11*/
0, /*FRSTRUCT=12*/
0, /*LLABEL=13*/
0, /*INVALID=14*/
0, /*INVALID=15*/
};
char aregtab[] { AREG5, AREG4, AREG3, 0 };
char dregtab[] { DREG7, DREG6, DREG5, DREG4, DREG3, 0 };
int inittype;
/*
* doextdef - external definition syntax
* This is fairly complicated since you do not know if you are
* parsing a external function declaration or a real function
* until after you've already scanned the argument list for the
* function. Basically you start off scanning an external declaration
* or function in the same way by collecting attributes, scanning
* the declarator, then scanning the function arguments if a function.
* At that point you look at the next token and if its a '{', keyword
* proceed accordingly.
* The C Syntax handled by this routine is (roughly):
* external_definition:
* function_definition
* data_definition
* function_definition:
* type_specifier function_declarator function_body
* function_declarator:
* declarator ( parameter_list )
* data_definition:
* EXTERNAL type_specifier init_declarator_list ;
* STATIC type_specifier init_declarator_list ;
*/
doextdef() /* returns 0 for EOF or 1*/
{
register struct symbol *sp;
register int dflag;
int sc, type;
long size;
if(!next(SEMI)) {
opap = exprp = exprarea;
sc = EXTERNAL;
type = (xflag?LONG:INT);
dflag = gettype(&sc,&type,&size);
if(type==STRUCT) /* deal with forward ref structures */
chksyms();
while( dodecl(sc,type,0,size), (sp=dsp) != 0 ) {
if( !dflag && notfunction(sp->s_type) ) {
synerr("external definition syntax");
return;
}
if( !stypedef(sp) && sc != STATIC )
if (notfunction(sp->s_type)) /*[vlh] .globl ext. vars*/
outextdef(sp->s_symbol);
if( notfunction(sp->s_type) ) { /*not function, check init*/
if( !stypedef(sp) ) {
doinit(sp);
if (sc == STATIC)
chksyms();
}
}
else if( peek(RESWORD) || peek(LCURBR) ||
(peek(SYMBOL) && stypedef(csp)) ) {
if(!stypedef(sp) && sc!=STATIC) /*[vlh] .globl local proc*/
outextdef(sp->s_symbol);
funcbody(sp);
return;
}
dsp = 0;
if( !next(COMMA) )
break;
}
if( gettok() != SEMI )
synerr("external definition syntax");
}
}
/*
* gettype - get attribute types in attribute list
* Handles single word keywords, such as int, char, etc. and also
* handles the declarations of structures and unions.
*/
gettype(defsc,deftype,size) /* returns 0 for no type, 1 otherwise*/
int *defsc; /* default storage class*/
int *deftype; /* default data type*/
long *size; /* size of data element 3.4 int=>long*/
{
register int dtype, sc;
register int sflag, uflag, lflag, decflag;
register int token, stdflag, sbits;
long tsize;
register struct symbol *sp, *parent;
tdp = 0; tdflag = uflag = decflag = lflag = sflag = 0; tsize = 0L;
dtype = TYPELESS;
sc = *defsc;
for( ; ; decflag++ ) {
if( (token=gettok()) == SYMBOL && stypedef(csp) ) {
dtype = 0;
tdp = csp;
continue;
}
if( token != RESWORD )
break;
switch( cvalue ) {
case R_TYPEDEF:
if( tdflag )
error("invalid typedef statement");
tdflag++;
continue;
case R_STATIC:
if( sc && sc != STATIC && sc != EXTERNAL )
error("invalid storage class");
sc = STATIC;
continue;
case R_AUTO:
if( sc && sc != AUTO )
error("invalid storage class");
sc = AUTO;
continue;
case R_EXTERNAL:
if( sc && sc != EXTERNAL )
error("invalid storage class");
sc = EXTERNAL;
continue;
case R_REGISTER:
if( sc && sc != REGISTER && sc != PDECLIST )
error("invalid register specification");
sc = REGISTER;
continue;
case R_LONG:
lflag++;
continue;
case R_SHORT:
sflag++;
continue;
case R_UNSIGNED:
uflag++;
continue;
case R_STRUCT:
cvalue = STRUCT;
case R_UNION:
stdflag = tdflag;
tdflag = 0; sp = 0;
token = cvalue;
smember++;
if( next(SYMBOL) ) { /*struct [symbol] { ... }*/
sp = csp;
parent = csp;
strucptr[smember+instruct] = sp;
if( !sp->s_sc ) {
sp->s_attrib =| SDEFINED;
if(!infunc)
sp->s_attrib =| SGLOBAL;
sp->s_sc = STRPROTO;
sp->s_type = STRUCT;
sp->s_ssp = dalloc(0L);
}
if( sp->s_sc != STRPROTO )
error("redeclaration: %.8s",sp->s_symbol);
}
else parent = 0;
smember = 0;
if( next(LCURBR) ) {
instruct++;
strucptr[smember+instruct] = sp;
sbits = boffset;
boffset = 0;
tsize = dlist(token==STRUCT?STELCL:UNELCL);
boffset = sbits;
if(!next(RCURBR))
synerr("structure declaration syntax");
else if( sp ) {
if( dtab[sp->s_ssp] )
error("redeclaration: %.8s",sp->s_symbol);
dtab[sp->s_ssp] = tsize;
}
instruct--;
}
else if( !sp )
error("no structure name");
else if( sp->s_sc != STRPROTO )
error("invalid structure prototype: %.8s",sp->s_symbol);
else if( !dtab[sp->s_ssp] ) { /* FRSTRUCT */
token = FRSTRUCT;
if( ++frstp >= NFRSTR )
ferror("structure table overflow");
frstab[frstp] = sp;
}
else
tsize = dtab[sp->s_ssp];
tdflag = stdflag;
if( dtype != TYPELESS )
error("invalid type declaration");
dtype = (token == R_UNION) ? STRUCT : token;
continue;
case R_INT:
if( dtype != TYPELESS )
error("invalid type declaration");
dtype = INT;
continue;
case R_CHAR:
if( dtype != TYPELESS )
error("invalid type declaration");
dtype = CHAR;
continue;
case R_FLOAT: /*[vlh] ver. 3.4*/
case R_DOUBLE:
if( dtype != TYPELESS )
error("invalid type declaration");
dtype = FLOAT;
continue;
}
break;
}
pbtok(token);
if( dtype == TYPELESS )
dtype = INT;
if(!sc)
sc = AUTO;
if( lflag ) { /*allow: long float, long int*/
if( dtype == INT )
dtype = LONG;
/* else if( dtype == FLOAT ) */
/* dtype = DOUBLE; */
else
error("invalid long declaration");
}
if( sflag ) {
if( dtype != INT )
error("invalid short declaration");
}
if( uflag ) {
if( dtype != INT ) /*allow: unsigned int*/
error("invalid unsigned declaration");
else
dtype = UNSIGNED;
}
if( !sflag && xflag && dtype == INT )
dtype = LONG;
*defsc = sc;
*deftype = dtype;
*size = tsize;
if (dtype == STRUCT || dtype == FRSTRUCT)
csp->s_struc = parent;
return(decflag);
}
/*
* dodecl - process a single declarator
* This does all the grubby handling of a single declarator given
* the attributes for the declarator. Handles typedef attributes
* adjusts offsets for structure elements, allocates register
* variables, etc.
*/
long /* [vlh] 3.4 int => long */
dodecl(sc,type,offset,size) /* returns size of declarator*/
int sc; /* storage class*/
int type; /* data type*/
int offset; /* offset if in structure or union*/
long size; /* size of single data item 3.4 i=> l*/
{
register struct symbol *sp;
register int redecf, stype, dtype, i, j;
if( peek(SEMI) || peek(RPAREN) )
return(0);
if( instruct && next(COLON) ) { /*handle bit filler field*/
if(!(i=cexpr()))
size = salign(INT,offset);
else
size = falign(type,i);
}
else if( (type=|declarator(0)) >= 0 && (sp=dsp) != 0 ) {
if( tdp ) /*typedef name in declaration*/
type = addtdtype(tdp,type,sp->s_dp,&(sp->s_ssp));
else if( btype(type) == STRUCT ) {
if( size )
sp->s_ssp = dalloc(size);
else
error("invalid structure declaration: %.8s",sp->s_symbol);
}
else if( btype(type) == FRSTRUCT )
sp->s_ssp = frstp;
redecf = 0;
switch( sp->s_sc ) { /*check for redeclarations.*/
case 0:
break;
case PARMLIST:
if( sc != PDECLIST && sc != REGISTER )
goto redec;
break;
case BFIELDCL:
if( sc != STELCL && sc != UNELCL )
goto redec;
break;
case STELCL:
case UNELCL:
redecf++;
break; /* [vlh] get rid of redecf entirely ?? */
case EXTERNAL:
if (sp->s_type == type) {
if (sc == sp->s_sc) break;
if (sc == AUTO && suptype(type) == FUNCTION) {
sc = EXTERNAL;
break;
}
}
default:
redec:
error("redeclaration: %.8s",sp->s_symbol);
return(size);
}
sp->s_type = type;
dtype = suptype(type);
type = btype(type);
if( tdflag ) /*we are declaring typedef?*/
sp->s_attrib =| STYPEDEF;
if( instruct ) {
if( next(COLON) ) { /*handle bit field*/
sc = BFIELDCL;
i = cexpr();
j = (boffset<<8)|i;
if( redecf && sp->s_dp != j ) /* ??? */
goto redec;
sp->s_dp = j;
size = j = falign(type,i);
}
else
size = dsize(sp->s_type,sp->s_dp,sp->s_ssp) +
(j=salign(type,offset));
offset =+ j;
/* if( redecf && sp->s_offset != offset )
goto redec; */ /* [vlh] */
sp->s_offset = offset;
}
if( dtype == FUNCTION ) {
if( sc != AUTO && sc != EXTERNAL && sc != STATIC )
error("illegal function declaration");
if( sc != STATIC )
sc = EXTERNAL;
}
else if( sc == REGISTER ) {
if( !dtype ) {
if( !(dinfo[type]&DREG) ) { /* ignore reg specification */
/* error("illegal register specification"); */
sc = AUTO;
}
else if( !dregtab[ndregs] )
sc = AUTO;
else
sp->s_offset = dregtab[ndregs++];
}
else if( dtype != POINTER ) {
error("illegal register specification");
sc = AUTO; /*no more regs, make it auto*/
}
else if( !aregtab[naregs] )
sc = AUTO;
else
sp->s_offset = aregtab[naregs++];
}
if( sc == AUTO ) {
localsize =+ walign(dsize(sp->s_type,sp->s_dp,sp->s_ssp));
sp->s_offset = -localsize;
}
else if( sc == STATIC )
sp->s_offset = nextlabel++;
sp->s_sc = sc;
sp->s_attrib =| SDEFINED;
if(!infunc)
sp->s_attrib =| SGLOBAL;
}
return(size);
}
/*
* doinit - do external definition initialization
* Handles following C syntax:
* initializer:
* = constant_expression
* = { initializer_list }
* = { initializer_list , }
* initializer_list:
* constant_expression
* initializer_list , initializer_list
* { initializer_list }
*/
doinit(sp) /* returns number of elements init'ed*/
struct symbol *sp; /* pointer to symbol to init*/
{
register int type;
long isize, datasize, elsize;
type = sp->s_type;
datasize = dsize(type,sp->s_dp,sp->s_ssp);
if( peek(COMMA) || peek(SEMI) ) { /*no initialization*/
isize = walign(datasize);
if( sp->s_sc == EXTERNAL )
outcommon(sp->s_symbol,isize);
else {
outbss(); /*bss segment*/
outlab(sp->s_offset);
outresmem(isize);
outtext(); /*resume text segment*/
}
}
else {
next(ASSIGN); /*ignore '=' if there*/
if( type == LONG || pointer(type) )
outldata();
else if(type == DOUBLE || type == FLOAT) /*[vlh] 3.4*/
outfpdata();
else
outdata();
if( sp->s_sc == EXTERNAL )
outdlab(sp->s_symbol);
else
outlab(sp->s_offset);
isize = initlist(sp->s_type,sp->s_dp,sp->s_ssp);
if( isize < datasize ) {
outresmem(datasize-isize);
isize = datasize;
}
if( walign(isize) != isize )
outpad();
if( isize > datasize ) {
if( array(sp->s_type) ) {
for( type = sp->s_type; array(type); type = delsp(type) )
;
dtab[sp->s_dp] = isize / dsize(type,sp->s_dp,sp->s_ssp);
}
else
error("too many initializers");
}
if( sp->s_sc == STATIC )
outtext();
}
}
/*
* initlist - handles initializer lists
* This handles multi-level braces, and a character pointer pointing
* to a string. Most of the work is in keeping track of how many
* bytes are left on the current "row", and outputting padding if
* necessary.
*/
long
initlist(type,dp,sp) /* returns size of initializers in*/
/* bytes*/
int type; /* type of data*/
int dp; /* dimension pointer*/
int sp; /* structure pointer*/
{
register int nrows;
long datasize, i, elsize, nbleft, nbout; /* [vlh] 3.4 int=>long */
register int onetype;
for( onetype = type; array(onetype); onetype = delsp(onetype) )
;
nbout = 0;
datasize = dsize(type,dp,sp);
nbleft = 0; /*keep track of no. of bytes left*/
if( type == (ARRAY|CHAR) && next(STRING) ) {
nbout = cstrsize;
outstr();
if( datasize > nbout )
nbleft = datasize - nbout;
}
else if( array(type) || (btype(type)==STRUCT && notpointer(type)) ) {
elsize = datasize / dsize(delsp(type),dp+1,sp);
elsize = datasize / elsize;
if(!next(LCURBR))
error("missing { in initialization");
if( type == (ARRAY|CHAR) && next(STRING) ) {
nbout = cstrsize;
outstr();
if( datasize > nbout )
nbleft = datasize - nbout;
}
else {
do { /*in current row.*/
if( peek(SEMI) || peek(EOF) )
break;
if( peek(LCURBR) ) { /*recurse down one level?*/
if( nbleft ) {
outresmem(nbleft); /*pad rest of current row*/
nbout =+ nbleft;
nbleft = 0;
}
i = initlist(delsp(type),dp+1,sp);
if( i > elsize )
error("initializer list too long");
else if( i < elsize )
outresmem(elsize-i);
nbout =+ elsize;
}
else if( peek(RCURBR) )
break;
else {
i = oneinit(onetype);
nbout =+ i;
if(!nbleft)
nbleft = elsize;
if( i > nbleft )
error("initializer alignment");
nbleft = (i >= nbleft) ? 0 : nbleft - i;
}
} while( next(COMMA) );
}
if(!next(RCURBR))
synerr("missing }");
}
else {
i = next(LCURBR); /*pull of optional {*/
nbout = oneinit(onetype);
if( i && !next(RCURBR) )
synerr("missing }");
}
if( nbleft ) { /*pad current row*/
outresmem(nbleft);
nbout =+ nbleft;
}
return(nbout);
}
/*
* oneinit - get one initializer expression or constant
* This checks the type of the data item expected against the
* type obtained from expr. Note that there is no attempt to
* match structure initializations against the elements of the
* structure, hence, anything goes in a structure.
*/
oneinit(type) /* returns size of initializer*/
int type; /* type of initializer*/
{
register int op, value;
register struct tnode *tp;
commastop++;
tp = expr();
commastop--;
op = tp->t_op;
value = tp->t_value;
switch( alltype(type) ) {
case CHAR:
case ARRAY|CHAR:
if( op != CINT )
break;
outc(CHAR,value);
return(1);
case INT:
case ARRAY|INT:
case UNSIGNED:
case ARRAY|UNSIGNED:
if( op == CLONG || op == ADDR )
break;
if( op == CINT )
outc(INT,value);
else
outinit(tp,inittype);
return(2);
case LONG:
case ARRAY|LONG:
case POINTER|CHAR:
case POINTER|INT:
case POINTER|LONG:
case POINTER|STRUCT:
case POINTER|UNSIGNED:
if( op == CINT ) {
clvalue = value; /*[vlh] fix ??? MC ??? */
outlong(clvalue);
}
else if( op == CLONG )
outlong(clvalue);
else
outinit(tp,inittype);
return(4);
case DOUBLE: /* [vlh] 3.4 */
case FLOAT:
outfp(clvalue);
return(4);
case STRUCT:
case ARRAY|STRUCT:
if( op == CINT ) {
if( xflag ) {
clvalue = value;
outlong(clvalue);
return(4);
}
outc(INT,value);
return(2);
}
if( op == CLONG ) {
outlong(clvalue);
return(4);
}
outinit(tp,inittype);
if (xflag || op==ADDR) return(4);
if ((op=tp->t_right->t_op)==ADDR || op==CLONG) return(4); /*[vlh]*/
if ((op=tp->t_left->t_op)==ADDR || op==CLONG) return(4); /*[vlh]*/
return(2);
}
error("invalid initializer");
return(0);
}
/*
* funcbody - do function body declaration
* Basically handles function after we have scanned the parameter
* list, which is now set up in fargs array. We now proceed to
* look for any declarations for the function arguments, then the
* function declaration list, followed by the function statement list.
* The C syntax is:
* function_body:
* type_decl_list function_statement
* function_statement:
* { declaration_list statement_list }
*/
funcbody(fsp)
struct symbol *fsp;
{
register int olddp;
register struct symbol *sp;
register struct farg *fp;
register int offset, toff;
infunc++;
sp = fsp;
opap = exprp;
frp = snalloc(delsp(sp->s_type),sp->s_sc,sp->s_type,sp->s_dp,
sp->s_ssp);
exprp = opap;
outtext();
outflab(sp->s_symbol);
olddp = cdp;
dlist(PDECLIST);
rlabel = nextlabel++;
if(!next(LCURBR))
synerr("function body syntax");
else {
localsize = 0; /*end of first auto offset from l.e.p.*/
offset = 8; /*first arg offset from l.e.p.*/
for( fp = &fargtab[0]; sp = fp->f_sp; fp++ ) {
toff = offset;
if( sp->s_type == CHAR ) /*char argument*/
toff++; /*offset of lower byte in word*/
if( sp->s_sc == REGISTER )
fp->f_offset = toff;
else {
fp->f_offset = 0; /*really is auto arg*/
sp->s_offset = toff;
sp->s_sc = AUTO;
}
if( array(sp->s_type) ) { /*change array ref to pointer*/
sp->s_type = addsp(delsp(sp->s_type),POINTER);
sp->s_dp++;
}
offset =+ walign(dsize(sp->s_type,sp->s_dp,sp->s_ssp));
}
dlist(0);
chksyms();
outbentry(localsize,ndregs,naregs);
copyargs(); /*copy args to registers where required*/
while(!next(RCURBR)) {
if( next(EOF) ) {
error("{ not matched by }");
break;
}
stmt();
}
}
outlab(rlabel);
outbexit(ndregs,naregs);
cdp = olddp;
infunc--;
freesyms();
}
/*
* copyargs - copy args to register where required
* fargtab has been set so that args declared to be registers have a
* non-zero offset value and the register number is in the symbol
* table pointed to by symbol.
*/
copyargs() /* returns - none*/
{
register struct symbol *sp;
register struct farg *fp;
for( fp = &fargtab[0]; sp = fp->f_sp; fp++ ) {
if( fp->f_offset ) /*was declared register*/
outassign(snalloc(sp->s_type,sp->s_sc,sp->s_offset,0,0),
snalloc(sp->s_type,AUTO,fp->f_offset,0,0));
}
}
/*
* dlist - declaration list
* Handles declaration lists in the following places:
* function parameter list declarations, structure or union member
* declarations and local declarations in functions.
*/
long
dlist(defsc) /* returns length of declarators*/
int defsc; /* default storage class*/
{
register int offset;
register struct symbol *sp;
register long i, ddsize;
long size; /* [vlh] 3.4 int => long */
int type, sc, isize;
offset = 0; ddsize = 0L;
do {
sc = defsc;
type = INT;
if( !gettype(&sc,&type,&size) )
break;
do {
i = dodecl(sc,type,offset,size);
if( defsc != UNELCL ) {
isize = i;
offset =+ isize;
ddsize =+ i;
}
else if( i > ddsize )
ddsize = i;
if( sc == STATIC && dsp && !stypedef(dsp) )
doinit(dsp); /*process any initializer*/
dsp = 0;
} while ( next(COMMA) );
if(!next(SEMI)) {
synerr("declaration syntax");
break;
}
} while( 1 );
isize = ddsize;
ddsize =+ salign(INT,isize);
return(ddsize);
}
/*
* declarator - get one declarator
* Basically uses getdecl, which returns the declaration types
* reversed in the type word.
*/
declarator(castflg) /* returns type or -1*/
int castflg;
{
register int type, t;
dsp = 0;
if( (type=getdecl(castflg)) >= 0 )
return( revsp(type) );
return(type);
}
/*
* getdecl - get one declarator, handling *, (), etc.
* The significance of the value returned by declarator is: the
* least significant two bits represent the values (POINTER,FUNCTION,
* ARRAY), these values are repeated through the word. For example,
* the declarations result in the following values for declarator:
* *x() => (POINTER,FUNCTION)
* (*x)() => (FUNCTION,POINTER)
* *(*x)() => (POINTER,FUNCTION,POINTER)
* The following C syntax is handled here:
* function_declarator:
* declarator ( parameter_list )
* declarator:
* identifier
* ( declarator )
* * declarator
* declarator [ constant-expression ]
*/
getdecl(castflg) /* returns special type of declarator*/
int castflg; /* casting flag, 1=>allow no declarator*/
{
register int type, i, value, sdp;
register struct symbol *sp, *tsp;
register struct farg *fp;
register char *p;
long lvalue;
type = 0;
if( next(LPAREN) ) { /*( declarator ) ...*/
type = getdecl(castflg);
if(!next(RPAREN))
goto baddec;
}
if( next(MULT) )
return(addsp(getdecl(castflg),POINTER));
sdp = cdp;
if( next(SYMBOL) ) {
sp = dsp = csp;
type = 0;
sp->s_dp = sdp;
}
while( 1 ) {
if( next(LPAREN) ) { /*declarator ( ... )*/
if(!infunc) {
ndregs = naregs = 0;
for( fp = &fargtab[0]; next(SYMBOL); ) {
p = csp;
if( p->s_attrib & SDEFINED )
error("redeclaration: %.8s",p->s_symbol);
else if( fp >= &fargtab[NFARGS-1] ) {
synerr("too many params");
break;
}
else {
p->s_attrib =| SDEFINED;
p->s_sc = PARMLIST;
p->s_type = INT; /*default to int*/
fp->f_sp = p;
fp++;
}
if(!next(COMMA))
break;
}
fp->f_sp = 0;
}
if(!next(RPAREN))
break;
type = addsp(type,FUNCTION);
continue;
}
if( next(LBRACK) ) { /*declarator [ cexpr ]*/
if( next(RBRACK) )
dalloc(1L);
else {
tsp = dsp; /* [vlh] 3.4 save in case of reset */
value = cexpr(); /* recurses on sizeof.... resets dsp */
dsp = tsp; /* [vlh] 3.4 */
lvalue = value; /* [vlh] 3.4 */
for( i = sdp; i < cdp; )
dtab[i++] =* lvalue;
dalloc(lvalue);
if( !next(RBRACK) )
break;
}
type = addsp(type,ARRAY);
continue;
}
if( castflg || dsp )
return(type);
break;
}
baddec:
synerr("invalid declarator");
return(-1);
}
/* dalloc - dimension table allocation*/
/* Allocates an entry in the dimension table.*/
dalloc(dimsize) /* returns ptr to dimension allocated*/
long dimsize; /* dimension size [vlh] 3.4 i=>l*/
{
register int i;
if( (i=cdp++) >= DSIZE-1 )
ferror("dimension table overflow");
dtab[i] = dimsize;
return(i);
}
/* addsp - add special type to special type info*/
/* Takes given special type and adds it into the special type field.*/
addsp(type,nsptype) /* returns resulting type*/
int type; /* old type field*/
int nsptype; /* special type to be added*/
{
register int dtype;
dtype = btype(type);
type =& (~TYPE);
return( (type<<SUTYPLEN) | suptype(nsptype) | dtype );
}
/* delsp - delete one special type info field from special type info*/
/* Takes given special type field and deletes least sign.*/
delsp(type) /* returns resulting type*/
int type; /* old special type*/
{
register int dtype;
dtype = btype(type);
type =& (~(ALLTYPE));
return( (type>>SUTYPLEN) | dtype );
}
/*
* revsp - reverse special type info
* This allows for the processing of the super-type info in
* the reverse order, which is necessary for initializations.
*/
revsp(type) /* returns reversed type info*/
int type; /* type to reverse*/
{
register int t;
for( t = btype(type); suptype(type) != 0; type = delsp(type) )
t = addsp(t,type);
return(t);
}
/* falign - handle bit field alignments*/
falign(type,flen) /* returns number of bytes padded*/
int type; /* data type*/
int flen; /* field length*/
{
register int off;
off = 0;
if( flen <= 0 ) {
error("invalid field size");
flen = 0;
}
switch( type ) {
case INT:
case UNSIGNED:
if( flen > BITSPWORD )
error("field overflows word");
if( flen + boffset > BITSPWORD )
off = CHRSPWORD;
break;
case CHAR:
if( flen > BITSPCHAR )
error("field overflows byte");
if( flen + boffset > BITSPCHAR )
off = 1;
break;
default:
error("invalid field type description");
return(0);
}
if( off )
boffset = 0;
boffset =+ flen;
return(off);
}
/* salign - structure alignment*/
salign(type,offset) /* returns bytes of padding*/
int type; /* data type to align*/
int offset; /* current structure offset*/
{
register int off;
off = offset;
if( boffset ) { /*remaining bit fields, flush 'em*/
off =+ (boffset+(BITSPCHAR-1))/BITSPCHAR;
boffset = 0;
}
while( array(type) ) /*get base type*/
type = delsp(type);
if( type != CHAR ) /*need word boundary*/
off = walign(off);
return( off - offset );
}
/* dsize - returns size of data object in bytes*/
long /* [vlh] 3.4 */
dsize(type,dp,sp) /* returns number of bytes*/
int type; /* type of node*/
int dp; /* dimension pointer*/
int sp; /* size pointer if structure*/
{
register long nel, size;
nel = 1;
for( ; array(type); type = delsp(type) )
nel = dtab[dp];
if( function(type) )
return(0);
size = (pointer(type)) ? PTRSIZE : (type == STRUCT) ?
dtab[sp] : dinfo[type]&DTSIZE;
if(!size)
error("invalid data type");
return( size * nel );
}
/*
* addtdtype - add typedef info into declarator
* here we very carefully add in the dimensions for an array typedef
* declaration. Note that declarator has already allocated the
* declarator-specific dimensions, now we allocate the typedef
* dimensions and adjust the size of the declarator's dimensions.
* Note that this must be done before the dalloc for the structure,
* otherwise we would mix up array and structure sizes.
*/
addtdtype(tddp,type,dp,ssp) /* returns type*/
struct symbol *tddp;
int type;
int dp;
int *ssp;
{
register int ntype, t, i, tdf;
for( tdf = 0, t = tddp->s_type; suptype(t); t = delsp(t) )
if( array(t) ) {
tdf++;
break;
}
ntype = 0;
for( t = type, i = dp; suptype(t); t = delsp(t) ) {
ntype = addsp(ntype,t);
if( tdf && array(t) )
dtab[i++] =* dtab[tddp->s_dp];
}
for( t = tddp->s_type, i = tddp->s_dp; suptype(t); t = delsp(t) )
if( array(t) )
dalloc(dtab[i++]);
for( t = tddp->s_type; suptype(ntype); ntype = delsp(ntype) )
t = addsp(t,ntype);
if( (ntype=btype(t)) == STRUCT )
*ssp = tddp->s_ssp;
else if( ntype == FRSTRUCT )
*ssp = frstp;
return(t);
}
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