Rewrite dyldcache plugin

- still supports only 64-bit caches
- use MACH0_ functions
- parse symbols, sections and classes
- use R_DYLDCACHE_FILTER env variable to symbolicate only a subset of the cache
- rebase unslid caches on-the-fly, properly slide slid caches symbols

libr/bin/format/mach0/mach0_specs.h

@@ -243,4 +243,50 @@ typedef struct {
 	uint32_t pad;
 } cache_img_t;
 
+typedef struct {
+	uint32_t version;
+	uint32_t page_size;
+	uint32_t page_starts_offset;
+	uint32_t page_starts_count;
+	uint32_t page_extras_offset;
+	uint32_t page_extras_count;
+	uint64_t delta_mask;
+	uint64_t value_add;
+} cache_slide2_t;
+
+typedef struct
+{
+	uint32_t version;
+	uint32_t imageExtrasCount;
+	uint32_t imagesExtrasOffset;
+	uint32_t bottomUpListOffset;
+	uint32_t dylibTrieOffset;
+	uint32_t dylibTrieSize;
+	uint32_t initializersOffset;
+	uint32_t initializersCount;
+	uint32_t dofSectionsOffset;
+	uint32_t dofSectionsCount;
+	uint32_t reExportListOffset;
+	uint32_t reExportCount;
+	uint32_t depListOffset;
+	uint32_t depListCount;
+	uint32_t rangeTableOffset;
+	uint32_t rangeTableCount;
+	uint64_t dyldSectionAddr;
+} cache_accel_t;
+
+typedef struct
+{
+	uint64_t exportsTrieAddr;
+	uint64_t weakBindingsAddr;
+	uint32_t exportsTrieSize;
+	uint32_t weakBindingsSize;
+	uint32_t dependentsStartArrayIndex;
+	uint32_t reExportsStartArrayIndex;
+} cache_imgxtr_t;
+
+#define DYLD_CACHE_SLIDE_PAGE_ATTRS 0xC000
+#define DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA 0x8000
+#define DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE 0x4000
+#define DYLD_CACHE_SLIDE_PAGE_ATTR_END 0x8000
 #endif