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