Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 1 | /* Frame object implementation */ |
| 2 | |
| 3 | #include "allobjects.h" |
| 4 | |
| 5 | #include "compile.h" |
| 6 | #include "frameobject.h" |
| 7 | #include "opcode.h" |
| 8 | #include "structmember.h" |
| 9 | |
| 10 | #define OFF(x) offsetof(frameobject, x) |
| 11 | |
| 12 | static struct memberlist frame_memberlist[] = { |
| 13 | {"f_back", T_OBJECT, OFF(f_back)}, |
| 14 | {"f_code", T_OBJECT, OFF(f_code)}, |
| 15 | {"f_globals", T_OBJECT, OFF(f_globals)}, |
| 16 | {"f_locals", T_OBJECT, OFF(f_locals)}, |
| 17 | {NULL} /* Sentinel */ |
| 18 | }; |
| 19 | |
| 20 | static object * |
| 21 | frame_getattr(f, name) |
| 22 | frameobject *f; |
| 23 | char *name; |
| 24 | { |
| 25 | return getmember((char *)f, frame_memberlist, name); |
| 26 | } |
| 27 | |
| 28 | static void |
| 29 | frame_dealloc(f) |
| 30 | frameobject *f; |
| 31 | { |
| 32 | XDECREF(f->f_back); |
| 33 | XDECREF(f->f_code); |
| 34 | XDECREF(f->f_globals); |
| 35 | XDECREF(f->f_locals); |
| 36 | XDEL(f->f_valuestack); |
| 37 | XDEL(f->f_blockstack); |
| 38 | DEL(f); |
| 39 | } |
| 40 | |
| 41 | typeobject Frametype = { |
| 42 | OB_HEAD_INIT(&Typetype) |
| 43 | 0, |
| 44 | "frame", |
| 45 | sizeof(frameobject), |
| 46 | 0, |
| 47 | frame_dealloc, /*tp_dealloc*/ |
| 48 | 0, /*tp_print*/ |
| 49 | frame_getattr, /*tp_getattr*/ |
| 50 | 0, /*tp_setattr*/ |
| 51 | 0, /*tp_compare*/ |
| 52 | 0, /*tp_repr*/ |
| 53 | 0, /*tp_as_number*/ |
| 54 | 0, /*tp_as_sequence*/ |
| 55 | 0, /*tp_as_mapping*/ |
| 56 | }; |
| 57 | |
| 58 | frameobject * |
| 59 | newframeobject(back, code, globals, locals, nvalues, nblocks) |
| 60 | frameobject *back; |
| 61 | codeobject *code; |
| 62 | object *globals; |
| 63 | object *locals; |
| 64 | int nvalues; |
| 65 | int nblocks; |
| 66 | { |
| 67 | frameobject *f; |
| 68 | if ((back != NULL && !is_frameobject(back)) || |
| 69 | code == NULL || !is_codeobject(code) || |
| 70 | globals == NULL || !is_dictobject(globals) || |
| 71 | locals == NULL || !is_dictobject(locals) || |
| 72 | nvalues < 0 || nblocks < 0) { |
| 73 | err_badcall(); |
| 74 | return NULL; |
| 75 | } |
| 76 | f = NEWOBJ(frameobject, &Frametype); |
| 77 | if (f != NULL) { |
| 78 | if (back) |
| 79 | INCREF(back); |
| 80 | f->f_back = back; |
| 81 | INCREF(code); |
| 82 | f->f_code = code; |
| 83 | INCREF(globals); |
| 84 | f->f_globals = globals; |
| 85 | INCREF(locals); |
| 86 | f->f_locals = locals; |
| 87 | f->f_valuestack = NEW(object *, nvalues+1); |
| 88 | f->f_blockstack = NEW(block, nblocks+1); |
| 89 | f->f_nvalues = nvalues; |
| 90 | f->f_nblocks = nblocks; |
| 91 | f->f_iblock = 0; |
| 92 | if (f->f_valuestack == NULL || f->f_blockstack == NULL) { |
| 93 | err_nomem(); |
| 94 | DECREF(f); |
| 95 | f = NULL; |
| 96 | } |
| 97 | } |
| 98 | return f; |
| 99 | } |
| 100 | |
| 101 | /* Block management */ |
| 102 | |
| 103 | void |
| 104 | setup_block(f, type, handler, level) |
| 105 | frameobject *f; |
| 106 | int type; |
| 107 | int handler; |
| 108 | int level; |
| 109 | { |
| 110 | block *b; |
| 111 | if (f->f_iblock >= f->f_nblocks) { |
| 112 | fprintf(stderr, "XXX block stack overflow\n"); |
| 113 | abort(); |
| 114 | } |
| 115 | b = &f->f_blockstack[f->f_iblock++]; |
| 116 | b->b_type = type; |
| 117 | b->b_level = level; |
| 118 | b->b_handler = handler; |
| 119 | } |
| 120 | |
| 121 | block * |
| 122 | pop_block(f) |
| 123 | frameobject *f; |
| 124 | { |
| 125 | block *b; |
| 126 | if (f->f_iblock <= 0) { |
| 127 | fprintf(stderr, "XXX block stack underflow\n"); |
| 128 | abort(); |
| 129 | } |
| 130 | b = &f->f_blockstack[--f->f_iblock]; |
| 131 | return b; |
| 132 | } |