/* * Copyright (c) 2008 Apple Inc. All Rights Reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #import "objc-auto.h" #ifndef OBJC_NO_GC #import <auto_zone.h> #import <objc/objc.h> #import <objc/runtime.h> #import "objc-auto-dump.h" #import "objc-private.h" #import <strings.h> /* * Utilities */ static char myType() { char type = 0; if (sizeof(void *) == 8) type |= SixtyFour; #if __LITTLE_ENDIAN__ type |= Little; #endif return type; } /* * Sigh, a mutable set. */ typedef struct { long *items; long count; long capacity; } pointer_set_t; static pointer_set_t *new_pointer_set() { pointer_set_t *result = malloc_zone_malloc(_objc_internal_zone(), sizeof(pointer_set_t)); result->items = calloc(64, sizeof(long)); result->count = 0; result->capacity = 63; // last valid ptr, also mask return result; } static void pointer_set_grow(pointer_set_t *set); static void pointer_set_add(pointer_set_t *set, long ptr) { long hash = ptr & set->capacity; while (1) { if (!set->items[hash]) { set->items[hash] = ptr; ++set->count; if (set->count*3 > set->capacity*2) pointer_set_grow(set); return; } if (set->items[hash] == ptr) return; hash = (hash + 1) & set->capacity; } } static void pointer_set_grow(pointer_set_t *set) { long oldCapacity = set->capacity; long *oldItems = set->items; long i; set->count = 0; set->capacity = 2*(oldCapacity+1)-1; set->items = malloc_zone_calloc(_objc_internal_zone(), 2*(oldCapacity+1), sizeof(long)); for (i = 0; i < oldCapacity; ++i) if (oldItems[i]) pointer_set_add(set, oldItems[i]); free(oldItems); } static void pointer_set_iterate(pointer_set_t *set, void (^block)(long item)) { long i; for (i = 0; i < set->capacity; ++i) if (set->items[i]) block(set->items[i]); } static void pointer_set_dispose(pointer_set_t *set) { free(set->items); free(set); } /* Quickly dump heap to a named file in a pretty raw format. */ PRIVATE_EXTERN BOOL _objc_dumpHeap(auto_zone_t *zone, const char *filename) { // just write interesting info to disk int fd = secure_open(filename, O_WRONLY|O_CREAT, geteuid()); if (fd < 0) return NO; FILE *fp = fdopen(fd, "w"); if (fp == NULL) { return NO; } fwrite(HEADER, strlen(HEADER), 1, fp); char type = myType(); fwrite(&type, 1, 1, fp); // for each thread... // do registers first auto_zone_register_dump dump_registers = ^(const void *base, unsigned long byte_size) { char type = REGISTER; fwrite(&type, 1, 1, fp); //fwrite(REGISTER, strlen(REGISTER), 1, fp); fwrite(&byte_size, sizeof(byte_size), 1, fp); fwrite(base, byte_size, 1, fp); }; // then stacks auto_zone_stack_dump dump_stack = ^(const void *base, unsigned long byte_size) { char type = THREAD; fwrite(&type, 1, 1, fp); //fwrite(THREAD, strlen(THREAD), 1, fp); fwrite(&byte_size, sizeof(byte_size), 1, fp); fwrite(base, byte_size, 1, fp); }; // then locals void (^dump_local)(const void *, unsigned long, unsigned int, unsigned long) = ^(const void *address, unsigned long size, unsigned int layout, unsigned long refcount) { // just write the value - rely on it showing up again as a node later char type = LOCAL; fwrite(&type, 1, 1, fp); fwrite(&address, sizeof(address), 1, fp); }; // roots auto_zone_root_dump dump_root = ^(const void **address) { char type = ROOT; fwrite(&type, 1, 1, fp); // write the address so that we can catch misregistered globals fwrite(&address, sizeof(address), 1, fp); // write content, even (?) if zero fwrite(address, sizeof(*address), 1, fp); }; // the nodes pointer_set_t *classes = new_pointer_set(); auto_zone_node_dump dump_node = ^(const void *address, unsigned long size, unsigned int layout, unsigned long refcount) { char type = NODE; fwrite(&type, 1, 1, fp); fwrite(&address, sizeof(address), 1, fp); fwrite(&size, sizeof(size), 1, fp); fwrite(&layout, sizeof(layout), 1, fp); fwrite(&refcount, sizeof(refcount), 1, fp); if ((layout & AUTO_UNSCANNED) != AUTO_UNSCANNED) { // now the nodes unfiltered content fwrite(address, size, 1, fp); } if ((layout & AUTO_OBJECT) == AUTO_OBJECT) { long theClass = *(long *)address; if (theClass) pointer_set_add(classes, theClass); } }; // weak auto_zone_weak_dump dump_weak = ^(const void **address, const void *item) { char type = WEAK; fwrite(&type, 1, 1, fp); fwrite(&address, sizeof(address), 1, fp); fwrite(&item, sizeof(item), 1, fp); }; auto_zone_dump(zone, dump_stack, dump_registers, dump_local, dump_root, dump_node, dump_weak); pointer_set_iterate(classes, ^(long class) { char type = CLASS; fwrite(&type, 1, 1, fp); fwrite(&class, sizeof(class), 1, fp); // write address so that we can map it from node isa's // classname (for grins) const char *className = class_getName((Class)class); unsigned int length = (int)strlen(className); fwrite(&length, sizeof(length), 1, fp); // n fwrite(className, length, 1, fp); // n bytes // strong layout const uint8_t *layout = class_getIvarLayout((Class)class); length = layout ? (int)strlen((char *)layout)+1 : 0; // format is <skipnibble><count nibble> ending with <0><0> fwrite(&length, sizeof(length), 1, fp); // n fwrite(layout, length, 1, fp); // n bytes // weak layout layout = class_getWeakIvarLayout((Class)class); length = layout ? (int)strlen((char *)layout)+1 : 0; // format is <skipnibble><count nibble> ending with <0><0> fwrite(&length, sizeof(length), 1, fp); // n fwrite(layout, length, 1, fp); // n bytes }); { // end char type = END; fwrite(&type, 1, 1, fp); fclose(fp); pointer_set_dispose(classes); } return YES; } #endif