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/* loadexp.c - load expressions for bcc */
/* Copyright (C) 1992 Bruce Evans */
#include "bcc.h"
#include "byteord.h"
#include "gencode.h"
#include "parse.h"
#include "reg.h"
#include "sc.h"
#include "scan.h"
#include "sizes.h"
#include "table.h"
#include "type.h"
PUBLIC value_t constexpression()
{
struct nodestruct *etmark;
struct nodestruct *exp;
struct symstruct *exprmark;
struct symstruct *symptr;
etmark = etptr;
exprmark = exprptr;
exp = assignment_exp();
etptr = etmark;
exprptr = exprmark;
if (exp->tag == LEAF && (symptr = exp->left.symptr)->storage == CONSTANT
&& symptr->type->scalar & ISCALAR)
return symptr->offset.offv;
error("constant expression required");
return 1;
}
PUBLIC void initexpression(type)
struct typestruct *type;
{
struct nodestruct *etmark;
struct nodestruct *exp;
struct symstruct *exprmark;
struct nodestruct *lhs;
struct symstruct *symptr;
uoffset_T value;
if (gvarsymptr->storage != GLOBAL)
reslocals();
exprmark = exprptr;
etmark = etptr;
exp = assignment_exp();
if (gvarsymptr->storage != GLOBAL)
{
lhs = leafnode(exprsym(gvarsymptr));
if (!(lhs->nodetype->constructor & (ARRAY | FUNCTION | VOID)))
lhs->flags = LVALUE;
makeleaf(node(ASSIGNOP, lhs, exp));
}
else if (exp->tag != LEAF ||
((symptr = exp->left.symptr)->storage != CONSTANT &&
(symptr->storage != GLOBAL || symptr->indcount != 0 ||
type->scalar & DLONG)) ||
(type->constructor | (symptr->type->constructor & ~FUNCTION)) &
~(ARRAY | POINTER))
error("initializer too complicated");
else
{
if ((symptr->type->scalar | type->scalar) & RSCALAR)
{
/* Can only afford castnode if result known constant. */
exp = castnode(type, exp);
symptr = exp->left.symptr;
}
if (type->scalar & RSCALAR)
{
if (type->scalar & FLOAT)
{
float val;
val = *symptr->offset.offd;
deflong(((uoffset_T *) &val)[0]);
}
else
{
deflong(((uoffset_T *) symptr->offset.offd)[0]);
deflong(((uoffset_T *) symptr->offset.offd)[1]);
}
etptr = etmark; /* XXX - stuff from end of function */
exprptr = exprmark;
return;
}
if (type->typesize == 1)
defbyte();
else if (type->typesize == 2)
defword();
#ifdef I8088
else if (!(type->scalar & DLONG))
defdword();
#endif
switch (symptr->storage)
{
case CONSTANT:
value = (uoffset_T) symptr->offset.offv;
if (type->scalar & DLONG)
{
deflong(value);
break;
}
/* XXX - put sizes in type struct to avoid tests */
if (type->scalar & CHAR)
value &= CHMASKTO;
else if (type->scalar & SHORT)
value &= shortmaskto;
else if (type->scalar & INT)
value &= intmaskto;
/* XXX - no longmaskto */
outnhex(value);
break;
case GLOBAL:
if (symptr->flags & LABELLED)
{
outlabel(symptr->name.label);
outplus();
outnhex((uoffset_T) symptr->offset.offi);
break;
}
if (*symptr->name.namep == 0) /* constant address */
{
outnhex((uoffset_T) symptr->offset.offi);
break;
}
outccname(symptr->name.namep);
if (symptr->offset.offi != 0)
{
if (symptr->offset.offi > 0)
outplus();
outshex(symptr->offset.offi);
}
outnl();
break;
}
}
etptr = etmark;
exprptr = exprmark;
}
PUBLIC struct typestruct *loadexpression(targreg, targtype)
store_pt targreg;
struct typestruct *targtype;
{
struct nodestruct *etmark;
struct nodestruct *exp;
struct symstruct *exprmark;
etmark = etptr;
exprmark = exprptr;
exp = expression();
if (targtype != NULL)
exp = castnode(targtype, exp);
makeleaf(exp);
if (targtype == NULL) /* this is for a switch */
{
targtype = exp->left.symptr->type;
if (!(targtype->scalar & (CHAR | INT))
&& (targtype->scalar & (LONG | DLONG)) != LONG)
{
if (targtype->scalar & SHORT)
targtype = promote(targtype);
else
{
error("non-integral selector in switch");
targtype = itype;
}
makeleaf(exp = castnode(targtype, exp));
}
}
load(exp->left.symptr, targreg); /* resets stack if value was there */
etptr = etmark;
exprptr = exprmark;
return exp->left.symptr->type;
}
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