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1.1 root 1: /*
2: * Copyright (c) 1980 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: #ifndef lint
8: static char sccsid[] = "@(#)flvalue.c 5.1 (Berkeley) 6/5/85";
9: #endif not lint
10:
11: #include "whoami.h"
12: #include "0.h"
13: #include "tree.h"
14: #include "opcode.h"
15: #include "objfmt.h"
16: #include "tree_ty.h"
17: #ifdef PC
18: # include "pc.h"
19: # include <pcc.h>
20: #endif PC
21: #include "tmps.h"
22:
23: /*
24: * flvalue generates the code to either pass on a formal routine,
25: * or construct the structure which is the environment for passing.
26: * it tells the difference by looking at the tree it's given.
27: */
28: struct nl *
29: flvalue( r , formalp )
30: struct tnode *r; /* T_VAR */
31: struct nl *formalp;
32: {
33: struct nl *p;
34: struct nl *tempnlp;
35: char *typename;
36: #ifdef PC
37: char extname[ BUFSIZ ];
38: #endif PC
39:
40: if ( r == TR_NIL ) {
41: return NLNIL;
42: }
43: typename = formalp -> class == FFUNC ? "function":"procedure";
44: if ( r->tag != T_VAR ) {
45: error("Expression given, %s required for %s parameter %s" ,
46: typename , typename , formalp -> symbol );
47: return NLNIL;
48: }
49: p = lookup(r->var_node.cptr);
50: if (p == NLNIL) {
51: return NLNIL;
52: }
53: switch ( p -> class ) {
54: case FFUNC:
55: case FPROC:
56: if ( r->var_node.qual != TR_NIL ) {
57: error("Formal %s %s cannot be qualified" ,
58: typename , p -> symbol );
59: return NLNIL;
60: }
61: # ifdef OBJ
62: (void) put(2, PTR_RV | bn << 8+INDX, (int)p->value[NL_OFFS]);
63: # endif OBJ
64: # ifdef PC
65: putRV( p -> symbol , bn , p -> value[ NL_OFFS ] ,
66: p -> extra_flags ,
67: p2type( p ) );
68: # endif PC
69: return p;
70: case FUNC:
71: case PROC:
72: if ( r->var_node.qual != TR_NIL ) {
73: error("%s %s cannot be qualified" , typename ,
74: p -> symbol );
75: return NLNIL;
76: }
77: if (bn == 0) {
78: error("Built-in %s %s cannot be passed as a parameter" ,
79: typename , p -> symbol );
80: return NLNIL;
81: }
82: /*
83: * allocate space for the thunk
84: */
85: tempnlp = tmpalloc((long) (sizeof(struct formalrtn)), NLNIL, NOREG);
86: # ifdef OBJ
87: (void) put(2 , O_LV | cbn << 8 + INDX ,
88: (int)tempnlp -> value[ NL_OFFS ] );
89: (void) put(2, O_FSAV | bn << 8, (long)p->value[NL_ENTLOC]);
90: # endif OBJ
91: # ifdef PC
92: putleaf( PCC_ICON , 0 , 0 ,
93: PCCM_ADDTYPE( PCCTM_PTR , PCCM_ADDTYPE( PCCTM_FTN , PCCTM_PTR|PCCT_STRTY ) ) ,
94: "_FSAV" );
95: sprintf( extname , "%s" , FORMALPREFIX );
96: sextname( &extname[ strlen( extname ) ] ,
97: p -> symbol , bn );
98: putleaf( PCC_ICON , 0 , 0 , p2type( p ) , extname );
99: putleaf( PCC_ICON , bn , 0 , PCCT_INT , (char *) 0 );
100: putop( PCC_CM , PCCT_INT );
101: putLV( (char *) 0 , cbn , tempnlp -> value[NL_OFFS] ,
102: tempnlp -> extra_flags , PCCT_STRTY );
103: putop( PCC_CM , PCCT_INT );
104: putop( PCC_CALL , PCCTM_PTR | PCCT_STRTY );
105: # endif PC
106: return p;
107: default:
108: error("Variable given, %s required for %s parameter %s" ,
109: typename , typename , formalp -> symbol );
110: return NLNIL;
111: }
112: }
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