--- /dev/null
+/*
+ * Copyright (c) 1999-2007 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@
+ */
+
+#if __OBJC2__
+
+#include "objc-private.h"
+#include "objc-file.h"
+
+#if TARGET_IPHONE_SIMULATOR
+// getsectiondata() not yet available
+
+// 1. Find segment with file offset == 0 and file size != 0. This segment's
+// contents span the Mach-O header. (File size of 0 is .bss, for example)
+// 2. Slide is header's address - segment's preferred address
+static ptrdiff_t
+objc_getImageSlide(const struct mach_header *header)
+{
+ unsigned long i;
+ const struct segment_command *sgp = (const struct segment_command *)(header + 1);
+
+ for (i = 0; i < header->ncmds; i++){
+ if (sgp->cmd == LC_SEGMENT) {
+ if (sgp->fileoff == 0 && sgp->filesize != 0) {
+ return (uintptr_t)header - (uintptr_t)sgp->vmaddr;
+ }
+ }
+ sgp = (const struct segment_command *)((char *)sgp + sgp->cmdsize);
+ }
+
+ // uh-oh
+ _objc_fatal("could not calculate VM slide for image");
+ return 0; // not reached
+}
+
+PRIVATE_EXTERN uint8_t *
+objc_getsectiondata(const struct mach_header *mh, const char *segname, const char *sectname, unsigned long *outSize)
+{
+ uint32_t size = 0;
+
+ char *data = getsectdatafromheader(mh, segname, sectname, &size);
+ if (data) {
+ *outSize = size;
+ return (uint8_t *)data + objc_getImageSlide(mh);
+ } else {
+ *outSize = 0;
+ return NULL;
+ }
+}
+
+static const struct segment_command *
+objc_getsegbynamefromheader(const mach_header *head, const char *segname)
+{
+ const struct segment_command *sgp;
+ unsigned long i;
+
+ sgp = (const struct segment_command *) (head + 1);
+ for (i = 0; i < head->ncmds; i++){
+ if (sgp->cmd == LC_SEGMENT) {
+ if (strncmp(sgp->segname, segname, sizeof(sgp->segname)) == 0) {
+ return sgp;
+ }
+ }
+ sgp = (const struct segment_command *)((char *)sgp + sgp->cmdsize);
+ }
+ return NULL;
+}
+
+PRIVATE_EXTERN uint8_t *
+objc_getsegmentdata(const struct mach_header *mh, const char *segname, unsigned long *outSize)
+{
+ const struct segment_command *seg;
+
+ seg = objc_getsegbynamefromheader(mh, segname);
+ if (seg) {
+ *outSize = seg->vmsize;
+ return (uint8_t *)seg->vmaddr + objc_getImageSlide(mh);
+ } else {
+ *outSize = 0;
+ return NULL;
+ }
+}
+
+// TARGET_IPHONE_SIMULATOR
+#endif
+
+#define GETSECT(name, type, sectname) \
+ PRIVATE_EXTERN type *name(const header_info *hi, size_t *outCount) \
+ { \
+ unsigned long byteCount = 0; \
+ type *data = (type *) \
+ getsectiondata(hi->mhdr, SEG_DATA, sectname, &byteCount); \
+ *outCount = byteCount / sizeof(type); \
+ return data; \
+ }
+
+// function name content type section name
+GETSECT(_getObjc2SelectorRefs, SEL, "__objc_selrefs");
+GETSECT(_getObjc2MessageRefs, message_ref_t, "__objc_msgrefs");
+GETSECT(_getObjc2ClassRefs, class_t *, "__objc_classrefs");
+GETSECT(_getObjc2SuperRefs, class_t *, "__objc_superrefs");
+GETSECT(_getObjc2ClassList, class_t *, "__objc_classlist");
+GETSECT(_getObjc2NonlazyClassList, class_t *, "__objc_nlclslist");
+GETSECT(_getObjc2CategoryList, category_t *, "__objc_catlist");
+GETSECT(_getObjc2NonlazyCategoryList, category_t *, "__objc_nlcatlist");
+GETSECT(_getObjc2ProtocolList, protocol_t *, "__objc_protolist");
+GETSECT(_getObjc2ProtocolRefs, protocol_t *, "__objc_protorefs");
+
+
+PRIVATE_EXTERN objc_image_info *
+_getObjcImageInfo(const headerType *mhdr, size_t *outBytes)
+{
+ unsigned long byteCount = 0;
+ objc_image_info *data = (objc_image_info *)
+ getsectiondata(mhdr, SEG_DATA, "__objc_imageinfo", &byteCount);
+ *outBytes = byteCount;
+ return data;
+}
+
+
+static const segmentType *
+getsegbynamefromheader(const headerType *head, const char *segname)
+{
+ const segmentType *sgp;
+ unsigned long i;
+
+ sgp = (const segmentType *) (head + 1);
+ for (i = 0; i < head->ncmds; i++){
+ if (sgp->cmd == SEGMENT_CMD) {
+ if (strncmp(sgp->segname, segname, sizeof(sgp->segname)) == 0) {
+ return sgp;
+ }
+ }
+ sgp = (const segmentType *)((char *)sgp + sgp->cmdsize);
+ }
+ return NULL;
+}
+
+PRIVATE_EXTERN BOOL
+_hasObjcContents(const header_info *hi)
+{
+ // Look for a __DATA,__objc* section other than __DATA,__objc_imageinfo
+ const segmentType *seg = getsegbynamefromheader(hi->mhdr, "__DATA");
+ if (!seg) return NO;
+
+ const sectionType *sect;
+ uint32_t i;
+ for (i = 0; i < seg->nsects; i++) {
+ sect = ((const sectionType *)(seg+1))+i;
+ if (0 == strncmp(sect->sectname, "__objc_", 7) &&
+ 0 != strncmp(sect->sectname, "__objc_imageinfo", 16))
+ {
+ return YES;
+ }
+ }
+
+ return NO;
+}
+
+#endif
projects / apple / objc4.git / blobdiff