| /* Object implementation; and 'noobject' implementation */ |
| |
| #include <stdio.h> |
| |
| #include "PROTO.h" |
| #include "object.h" |
| #include "stringobject.h" |
| #include "objimpl.h" |
| #include "errors.h" |
| |
| int StopPrint; /* Flag to indicate printing must be stopped */ |
| |
| /* Object allocation routines used by NEWOBJ and NEWVAROBJ macros */ |
| |
| object * |
| newobject(tp) |
| typeobject *tp; |
| { |
| object *op = (object *) malloc(tp->tp_basicsize); |
| if (op == NULL) |
| return err_nomem(); |
| NEWREF(op); |
| op->ob_type = tp; |
| return op; |
| } |
| |
| #if 0 /* unused */ |
| |
| varobject * |
| newvarobject(tp, size) |
| typeobject *tp; |
| unsigned int size; |
| { |
| varobject *op = (varobject *) |
| malloc(tp->tp_basicsize + size * tp->tp_itemsize); |
| if (op == NULL) |
| return err_nomem(); |
| NEWREF(op); |
| op->ob_type = tp; |
| op->ob_size = size; |
| return op; |
| } |
| |
| #endif |
| |
| static int prlevel; |
| |
| void |
| printobject(op, fp, flags) |
| object *op; |
| FILE *fp; |
| int flags; |
| { |
| /* Hacks to make printing a long or recursive object interruptible */ |
| prlevel++; |
| if (!StopPrint && intrcheck()) { |
| fprintf(fp, "\n[print interrupted]\n"); |
| StopPrint = 1; |
| } |
| if (!StopPrint) { |
| if (op == NULL) { |
| fprintf(fp, "<nil>"); |
| } |
| else if (op->ob_type->tp_print == NULL) { |
| fprintf(fp, "<%s object at %lx>", |
| op->ob_type->tp_name, (long)op); |
| } |
| else { |
| (*op->ob_type->tp_print)(op, fp, flags); |
| } |
| } |
| prlevel--; |
| if (prlevel == 0) |
| StopPrint = 0; |
| } |
| |
| object * |
| reprobject(v) |
| object *v; |
| { |
| object *w; |
| /* Hacks to make converting a long or recursive object interruptible */ |
| prlevel++; |
| if (!StopPrint && intrcheck()) { |
| StopPrint = 1; |
| w = NULL; |
| err_set(KeyboardInterrupt); |
| } |
| if (!StopPrint) { |
| if (v == NULL) { |
| w = newstringobject("<nil>"); |
| } |
| else if (v->ob_type->tp_repr == NULL) { |
| char buf[100]; |
| sprintf(buf, "<%.80s object at %lx>", |
| v->ob_type->tp_name, (long)v); |
| w = newstringobject(buf); |
| } |
| else { |
| w = (*v->ob_type->tp_repr)(v); |
| } |
| } |
| prlevel--; |
| if (prlevel == 0) |
| StopPrint = 0; |
| return w; |
| } |
| |
| int |
| cmpobject(v, w) |
| object *v, *w; |
| { |
| typeobject *tp; |
| if (v == w) |
| return 0; |
| if (v == NULL) |
| return -1; |
| if (w == NULL) |
| return 1; |
| if ((tp = v->ob_type) != w->ob_type) |
| return strcmp(tp->tp_name, w->ob_type->tp_name); |
| if (tp->tp_compare == NULL) |
| return (v < w) ? -1 : 1; |
| return ((*tp->tp_compare)(v, w)); |
| } |
| |
| |
| /* |
| NoObject is usable as a non-NULL undefined value, used by the macro None. |
| There is (and should be!) no way to create other objects of this type, |
| so there is exactly one. |
| */ |
| |
| static void |
| noprint(op, fp, flags) |
| object *op; |
| FILE *fp; |
| int flags; |
| { |
| fprintf(fp, "<no value>"); |
| } |
| |
| static typeobject Notype = { |
| OB_HEAD_INIT(&Typetype) |
| 0, |
| "novalue", |
| 0, |
| 0, |
| 0, /*tp_dealloc*/ /*never called*/ |
| noprint, /*tp_print*/ |
| }; |
| |
| object NoObject = { |
| OB_HEAD_INIT(&Notype) |
| }; |
| |
| |
| #ifdef TRACE_REFS |
| |
| static object refchain = {&refchain, &refchain}; |
| |
| NEWREF(op) |
| object *op; |
| { |
| ref_total++; |
| op->ob_refcnt = 1; |
| op->_ob_next = refchain._ob_next; |
| op->_ob_prev = &refchain; |
| refchain._ob_next->_ob_prev = op; |
| refchain._ob_next = op; |
| } |
| |
| DELREF(op) |
| object *op; |
| { |
| if (op->ob_refcnt < 0) { |
| fprintf(stderr, "negative refcnt\n"); |
| abort(); |
| } |
| op->_ob_next->_ob_prev = op->_ob_prev; |
| op->_ob_prev->_ob_next = op->_ob_next; |
| (*(op)->ob_type->tp_dealloc)(op); |
| } |
| |
| printrefs(fp) |
| FILE *fp; |
| { |
| object *op; |
| fprintf(fp, "Remaining objects:\n"); |
| for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) { |
| fprintf(fp, "[%d] ", op->ob_refcnt); |
| printobject(op, fp, 0); |
| putc('\n', fp); |
| } |
| } |
| |
| #endif |