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1.1 root 1: /* Copyright (c) 1980 Regents of the University of California */
2:
3: static char sccsid[] = "@(#)flvalue.c 1.2 10/2/80";
4:
5: #include "whoami.h"
6: #include "0.h"
7: #include "tree.h"
8: #include "opcode.h"
9: #include "objfmt.h"
10: #ifdef PC
11: # include "pc.h"
12: # include "pcops.h"
13: #endif PC
14: #ifdef OBJ
15: /*
16: * define the display structure for purposes of allocating
17: * a temporary
18: */
19: struct dispsave {
20: char *ptr;
21: };
22: #endif OBJ
23:
24: /*
25: * flvalue generates the code to either pass on a formal routine,
26: * or construct the structure which is the environment for passing.
27: * it tells the difference by looking at the tree it's given.
28: */
29: struct nl *
30: flvalue( r , formalp )
31: int *r;
32: struct nl *formalp;
33: {
34: struct nl *p;
35: long tempoff;
36: char *typename;
37:
38: if ( r == NIL ) {
39: return NIL;
40: }
41: typename = formalp -> class == FFUNC ? "function":"procedure";
42: if ( r[0] != T_VAR ) {
43: error("Expression given, %s required for %s parameter %s" ,
44: typename , typename , formalp -> symbol );
45: return NIL;
46: }
47: p = lookup(r[2]);
48: if (p == NIL) {
49: return NIL;
50: }
51: switch ( p -> class ) {
52: case FFUNC:
53: case FPROC:
54: if ( r[3] != NIL ) {
55: error("Formal %s %s cannot be qualified" ,
56: typename , p -> symbol );
57: return NIL;
58: }
59: # ifdef OBJ
60: put( 2 , PTR_RV | bn << 8+INDX , p -> value[NL_OFFS] );
61: # endif OBJ
62: # ifdef PC
63: putRV( p -> symbol , bn , p -> value[ NL_OFFS ] ,
64: p2type( p ) );
65: # endif PC
66: return p -> type;
67: case FUNC:
68: case PROC:
69: if ( r[3] != NIL ) {
70: error("%s %s cannot be qualified" , typename ,
71: p -> symbol );
72: return NIL;
73: }
74: if (bn == 0) {
75: error("Built-in %s %s cannot be passed as a parameter" ,
76: typename , p -> symbol );
77: return NIL;
78: }
79: /*
80: * formal routine structure:
81: *
82: * struct formalrtn {
83: * long (*entryaddr)();
84: * long cbn;
85: * struct dispsave disp[2*MAXLVL];
86: * };
87: */
88: sizes[ cbn ].om_off -= sizeof (long (*)())
89: + sizeof (long)
90: + 2*bn*sizeof (struct dispsave);
91: tempoff = sizes[ cbn ].om_off;
92: if ( sizes[ cbn ].om_off < sizes[ cbn ].om_max ) {
93: sizes[ cbn ].om_max = tempoff;
94: }
95: # ifdef OBJ
96: put( 2 , O_LV | cbn << 8 + INDX , tempoff );
97: put( 2 , O_FSAV | bn << 8 + INDX , p -> entloc );
98: # endif OBJ
99: # ifdef PC
100: putlbracket( ftnno , -tempoff );
101: putleaf( P2ICON , 0 , 0 ,
102: ADDTYPE( P2PTR , ADDTYPE( P2FTN , P2PTR|P2STRTY ) ) ,
103: "_FSAV" );
104: {
105: char extname[ BUFSIZ ];
106: char *starthere;
107: int i;
108:
109: starthere = &extname[0];
110: for ( i = 1 ; i < bn ; i++ ) {
111: sprintf( starthere , EXTFORMAT , enclosing[ i ] );
112: starthere += strlen( enclosing[ i ] ) + 1;
113: }
114: sprintf( starthere , EXTFORMAT , p -> symbol );
115: starthere += strlen( p -> symbol ) + 1;
116: if ( starthere >= &extname[ BUFSIZ ] ) {
117: panic( "flvalue namelength" );
118: }
119: putleaf( P2ICON , 0 , 0 , p2type( p ) , extname );
120: }
121: putleaf( P2ICON , bn , 0 , P2INT , 0 );
122: putop( P2LISTOP , P2INT );
123: putLV( 0 , cbn , tempoff , P2STRTY );
124: putop( P2LISTOP , P2INT );
125: putop( P2CALL , P2PTR | P2STRTY );
126: # endif PC
127: return p -> type;
128: default:
129: error("Variable given, %s required for %s parameter %s" ,
130: typename , typename , formalp -> symbol );
131: return NIL;
132: }
133: }
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