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/* Frame object implementation */
#include "allobjects.h"
#include "compile.h"
#include "frameobject.h"
#include "opcode.h"
#include "structmember.h"
#define OFF(x) offsetof(frameobject, x)
static struct memberlist frame_memberlist[] = {
{"f_back", T_OBJECT, OFF(f_back)},
{"f_code", T_OBJECT, OFF(f_code)},
{"f_globals", T_OBJECT, OFF(f_globals)},
{"f_locals", T_OBJECT, OFF(f_locals)},
{NULL} /* Sentinel */
};
static object *
frame_getattr(f, name)
frameobject *f;
char *name;
{
return getmember((char *)f, frame_memberlist, name);
}
static void
frame_dealloc(f)
frameobject *f;
{
XDECREF(f->f_back);
XDECREF(f->f_code);
XDECREF(f->f_globals);
XDECREF(f->f_locals);
XDEL(f->f_valuestack);
XDEL(f->f_blockstack);
DEL(f);
}
typeobject Frametype = {
OB_HEAD_INIT(&Typetype)
0,
"frame",
sizeof(frameobject),
0,
frame_dealloc, /*tp_dealloc*/
0, /*tp_print*/
frame_getattr, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
};
frameobject *
newframeobject(back, code, globals, locals, nvalues, nblocks)
frameobject *back;
codeobject *code;
object *globals;
object *locals;
int nvalues;
int nblocks;
{
frameobject *f;
if ((back != NULL && !is_frameobject(back)) ||
code == NULL || !is_codeobject(code) ||
globals == NULL || !is_dictobject(globals) ||
locals == NULL || !is_dictobject(locals) ||
nvalues < 0 || nblocks < 0) {
err_badcall();
return NULL;
}
f = NEWOBJ(frameobject, &Frametype);
if (f != NULL) {
if (back)
INCREF(back);
f->f_back = back;
INCREF(code);
f->f_code = code;
INCREF(globals);
f->f_globals = globals;
INCREF(locals);
f->f_locals = locals;
f->f_valuestack = NEW(object *, nvalues+1);
f->f_blockstack = NEW(block, nblocks+1);
f->f_nvalues = nvalues;
f->f_nblocks = nblocks;
f->f_iblock = 0;
if (f->f_valuestack == NULL || f->f_blockstack == NULL) {
err_nomem();
DECREF(f);
f = NULL;
}
}
return f;
}
/* Block management */
void
setup_block(f, type, handler, level)
frameobject *f;
int type;
int handler;
int level;
{
block *b;
if (f->f_iblock >= f->f_nblocks) {
fprintf(stderr, "XXX block stack overflow\n");
abort();
}
b = &f->f_blockstack[f->f_iblock++];
b->b_type = type;
b->b_level = level;
b->b_handler = handler;
}
block *
pop_block(f)
frameobject *f;
{
block *b;
if (f->f_iblock <= 0) {
fprintf(stderr, "XXX block stack underflow\n");
abort();
}
b = &f->f_blockstack[--f->f_iblock];
return b;
}
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