2 * Copyright (C) 2008 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 * Access .dex (Dalvik Executable Format) files. The code here assumes that
18 * the DEX file has been rewritten (byte-swapped, word-aligned) and that
19 * the contents can be directly accessed as a collection of C arrays. Please
20 * see docs/dalvik/dex-format.html for a detailed description.
22 * The structure and field names were chosen to match those in the DEX spec.
24 * It's generally assumed that the DEX file will be stored in shared memory,
25 * obviating the need to copy code and constant pool entries into newly
26 * allocated storage. Maintaining local pointers to items in the shared area
27 * is valid and encouraged.
29 * All memory-mapped structures are 32-bit aligned unless otherwise noted.
31 #ifndef _LIBDEX_DEXFILE
32 #define _LIBDEX_DEXFILE
34 #include "vm/Common.h" // basic type defs, e.g. u1/u2/u4/u8, and LOG
35 #include "libdex/SysUtil.h"
38 * gcc-style inline management -- ensures we have a copy of all functions
39 * in the library, so code that links against us will work whether or not
40 * it was built with optimizations enabled.
42 #ifndef _DEX_GEN_INLINES /* only defined by DexInlines.c */
43 # define DEX_INLINE extern __inline__
48 /* DEX file magic number */
49 #define DEX_MAGIC "dex\n"
50 /* version, encoded in 4 bytes of ASCII */
51 #define DEX_MAGIC_VERS "035\0"
53 /* same, but for optimized DEX header */
54 #define DEX_OPT_MAGIC "dey\n"
55 #define DEX_OPT_MAGIC_VERS "035\0"
57 #define DEX_DEP_MAGIC "deps"
60 * 160-bit SHA-1 digest.
62 enum { kSHA1DigestLen = 20,
63 kSHA1DigestOutputLen = kSHA1DigestLen*2 +1 };
65 /* general constants */
67 kDexEndianConstant = 0x12345678, /* the endianness indicator */
68 kDexNoIndex = 0xffffffff, /* not a valid index value */
72 * access flags and masks; the "standard" ones are all <= 0x4000
74 * Note: There are related declarations in vm/oo/Object.h in the ClassFlags
78 ACC_PUBLIC = 0x00000001, // class, field, method, ic
79 ACC_PRIVATE = 0x00000002, // field, method, ic
80 ACC_PROTECTED = 0x00000004, // field, method, ic
81 ACC_STATIC = 0x00000008, // field, method, ic
82 ACC_FINAL = 0x00000010, // class, field, method, ic
83 ACC_SYNCHRONIZED = 0x00000020, // method (only allowed on natives)
84 ACC_SUPER = 0x00000020, // class (not used in Dalvik)
85 ACC_VOLATILE = 0x00000040, // field
86 ACC_BRIDGE = 0x00000040, // method (1.5)
87 ACC_TRANSIENT = 0x00000080, // field
88 ACC_VARARGS = 0x00000080, // method (1.5)
89 ACC_NATIVE = 0x00000100, // method
90 ACC_INTERFACE = 0x00000200, // class, ic
91 ACC_ABSTRACT = 0x00000400, // class, method, ic
92 ACC_STRICT = 0x00000800, // method
93 ACC_SYNTHETIC = 0x00001000, // field, method, ic
94 ACC_ANNOTATION = 0x00002000, // class, ic (1.5)
95 ACC_ENUM = 0x00004000, // class, field, ic (1.5)
96 ACC_CONSTRUCTOR = 0x00010000, // method (Dalvik only)
97 ACC_DECLARED_SYNCHRONIZED =
98 0x00020000, // method (Dalvik only)
100 (ACC_PUBLIC | ACC_FINAL | ACC_INTERFACE | ACC_ABSTRACT
101 | ACC_SYNTHETIC | ACC_ANNOTATION | ACC_ENUM),
102 ACC_INNER_CLASS_MASK =
103 (ACC_CLASS_MASK | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC),
105 (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL
106 | ACC_VOLATILE | ACC_TRANSIENT | ACC_SYNTHETIC | ACC_ENUM),
108 (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL
109 | ACC_SYNCHRONIZED | ACC_BRIDGE | ACC_VARARGS | ACC_NATIVE
110 | ACC_ABSTRACT | ACC_STRICT | ACC_SYNTHETIC | ACC_CONSTRUCTOR
111 | ACC_DECLARED_SYNCHRONIZED),
114 /* annotation constants */
116 kDexVisibilityBuild = 0x00, /* annotation visibility */
117 kDexVisibilityRuntime = 0x01,
118 kDexVisibilitySystem = 0x02,
120 kDexAnnotationByte = 0x00,
121 kDexAnnotationShort = 0x02,
122 kDexAnnotationChar = 0x03,
123 kDexAnnotationInt = 0x04,
124 kDexAnnotationLong = 0x06,
125 kDexAnnotationFloat = 0x10,
126 kDexAnnotationDouble = 0x11,
127 kDexAnnotationString = 0x17,
128 kDexAnnotationType = 0x18,
129 kDexAnnotationField = 0x19,
130 kDexAnnotationMethod = 0x1a,
131 kDexAnnotationEnum = 0x1b,
132 kDexAnnotationArray = 0x1c,
133 kDexAnnotationAnnotation = 0x1d,
134 kDexAnnotationNull = 0x1e,
135 kDexAnnotationBoolean = 0x1f,
137 kDexAnnotationValueTypeMask = 0x1f, /* low 5 bits */
138 kDexAnnotationValueArgShift = 5,
141 /* map item type codes */
143 kDexTypeHeaderItem = 0x0000,
144 kDexTypeStringIdItem = 0x0001,
145 kDexTypeTypeIdItem = 0x0002,
146 kDexTypeProtoIdItem = 0x0003,
147 kDexTypeFieldIdItem = 0x0004,
148 kDexTypeMethodIdItem = 0x0005,
149 kDexTypeClassDefItem = 0x0006,
150 kDexTypeMapList = 0x1000,
151 kDexTypeTypeList = 0x1001,
152 kDexTypeAnnotationSetRefList = 0x1002,
153 kDexTypeAnnotationSetItem = 0x1003,
154 kDexTypeClassDataItem = 0x2000,
155 kDexTypeCodeItem = 0x2001,
156 kDexTypeStringDataItem = 0x2002,
157 kDexTypeDebugInfoItem = 0x2003,
158 kDexTypeAnnotationItem = 0x2004,
159 kDexTypeEncodedArrayItem = 0x2005,
160 kDexTypeAnnotationsDirectoryItem = 0x2006,
163 /* auxillary data section chunk codes */
165 kDexChunkClassLookup = 0x434c4b50, /* CLKP */
167 kDexChunkReducingIndexMap = 0x5249584d, /* RIXM */
168 kDexChunkExpandingIndexMap = 0x4549584d, /* EIXM */
170 kDexChunkEnd = 0x41454e44, /* AEND */
173 /* debug info opcodes and constants */
175 DBG_END_SEQUENCE = 0x00,
176 DBG_ADVANCE_PC = 0x01,
177 DBG_ADVANCE_LINE = 0x02,
178 DBG_START_LOCAL = 0x03,
179 DBG_START_LOCAL_EXTENDED = 0x04,
180 DBG_END_LOCAL = 0x05,
181 DBG_RESTART_LOCAL = 0x06,
182 DBG_SET_PROLOGUE_END = 0x07,
183 DBG_SET_EPILOGUE_BEGIN = 0x08,
185 DBG_FIRST_SPECIAL = 0x0a,
191 * Direct-mapped "header_item" struct.
193 typedef struct DexHeader {
194 u1 magic[8]; /* includes version number */
195 u4 checksum; /* adler32 checksum */
196 u1 signature[kSHA1DigestLen]; /* SHA-1 hash */
197 u4 fileSize; /* length of entire file */
198 u4 headerSize; /* offset to start of next section */
220 * Direct-mapped "map_item".
222 typedef struct DexMapItem {
223 u2 type; /* type code (see kDexType* above) */
225 u4 size; /* count of items of the indicated type */
226 u4 offset; /* file offset to the start of data */
230 * Direct-mapped "map_list".
232 typedef struct DexMapList {
233 u4 size; /* #of entries in list */
234 DexMapItem list[1]; /* entries */
238 * Direct-mapped "string_id_item".
240 typedef struct DexStringId {
241 u4 stringDataOff; /* file offset to string_data_item */
245 * Direct-mapped "type_id_item".
247 typedef struct DexTypeId {
248 u4 descriptorIdx; /* index into stringIds list for type descriptor */
252 * Direct-mapped "field_id_item".
254 typedef struct DexFieldId {
255 u2 classIdx; /* index into typeIds list for defining class */
256 u2 typeIdx; /* index into typeIds for field type */
257 u4 nameIdx; /* index into stringIds for field name */
261 * Direct-mapped "method_id_item".
263 typedef struct DexMethodId {
264 u2 classIdx; /* index into typeIds list for defining class */
265 u2 protoIdx; /* index into protoIds for method prototype */
266 u4 nameIdx; /* index into stringIds for method name */
270 * Direct-mapped "proto_id_item".
272 typedef struct DexProtoId {
273 u4 shortyIdx; /* index into stringIds for shorty descriptor */
274 u4 returnTypeIdx; /* index into typeIds list for return type */
275 u4 parametersOff; /* file offset to type_list for parameter types */
279 * Direct-mapped "class_def_item".
281 typedef struct DexClassDef {
282 u4 classIdx; /* index into typeIds for this class */
284 u4 superclassIdx; /* index into typeIds for superclass */
285 u4 interfacesOff; /* file offset to DexTypeList */
286 u4 sourceFileIdx; /* index into stringIds for source file name */
287 u4 annotationsOff; /* file offset to annotations_directory_item */
288 u4 classDataOff; /* file offset to class_data_item */
289 u4 staticValuesOff; /* file offset to DexEncodedArray */
293 * Direct-mapped "type_item".
295 typedef struct DexTypeItem {
296 u2 typeIdx; /* index into typeIds */
300 * Direct-mapped "type_list".
302 typedef struct DexTypeList {
303 u4 size; /* #of entries in list */
304 DexTypeItem list[1]; /* entries */
308 * Direct-mapped "code_item".
310 * The "catches" table is used when throwing an exception,
311 * "debugInfo" is used when displaying an exception stack trace or
312 * debugging. An offset of zero indicates that there are no entries.
314 typedef struct DexCode {
319 u4 debugInfoOff; /* file offset to debug info stream */
320 u4 insnsSize; /* size of the insns array, in u2 units */
322 /* followed by optional u2 padding */
323 /* followed by try_item[triesSize] */
324 /* followed by uleb128 handlersSize */
325 /* followed by catch_handler_item[handlersSize] */
329 * Direct-mapped "try_item".
331 typedef struct DexTry {
332 u4 startAddr; /* start address, in 16-bit code units */
333 u2 insnCount; /* instruction count, in 16-bit code units */
334 u2 handlerOff; /* offset in encoded handler data to handlers */
338 * Link table. Currently undefined.
340 typedef struct DexLink {
346 * Direct-mapped "annotations_directory_item".
348 typedef struct DexAnnotationsDirectoryItem {
349 u4 classAnnotationsOff; /* offset to DexAnnotationSetItem */
350 u4 fieldsSize; /* count of DexFieldAnnotationsItem */
351 u4 methodsSize; /* count of DexMethodAnnotationsItem */
352 u4 parametersSize; /* count of DexParameterAnnotationsItem */
353 /* followed by DexFieldAnnotationsItem[fieldsSize] */
354 /* followed by DexMethodAnnotationsItem[methodsSize] */
355 /* followed by DexParameterAnnotationsItem[parametersSize] */
356 } DexAnnotationsDirectoryItem;
359 * Direct-mapped "field_annotations_item".
361 typedef struct DexFieldAnnotationsItem {
363 u4 annotationsOff; /* offset to DexAnnotationSetItem */
364 } DexFieldAnnotationsItem;
367 * Direct-mapped "method_annotations_item".
369 typedef struct DexMethodAnnotationsItem {
371 u4 annotationsOff; /* offset to DexAnnotationSetItem */
372 } DexMethodAnnotationsItem;
375 * Direct-mapped "parameter_annotations_item".
377 typedef struct DexParameterAnnotationsItem {
379 u4 annotationsOff; /* offset to DexAnotationSetRefList */
380 } DexParameterAnnotationsItem;
383 * Direct-mapped "annotation_set_ref_item".
385 typedef struct DexAnnotationSetRefItem {
386 u4 annotationsOff; /* offset to DexAnnotationSetItem */
387 } DexAnnotationSetRefItem;
390 * Direct-mapped "annotation_set_ref_list".
392 typedef struct DexAnnotationSetRefList {
394 DexAnnotationSetRefItem list[1];
395 } DexAnnotationSetRefList;
398 * Direct-mapped "anotation_set_item".
400 typedef struct DexAnnotationSetItem {
402 u4 entries[1]; /* offset to DexAnnotationItem */
403 } DexAnnotationSetItem;
406 * Direct-mapped "annotation_item".
408 * NOTE: this structure is byte-aligned.
410 typedef struct DexAnnotationItem {
412 u1 annotation[1]; /* data in encoded_annotation format */
416 * Direct-mapped "encoded_array".
418 * NOTE: this structure is byte-aligned.
420 typedef struct DexEncodedArray {
421 u1 array[1]; /* data in encoded_array format */
425 * Lookup table for classes. It provides a mapping from class name to
426 * class definition. Used by dexFindClass().
428 * We calculate this at DEX optimization time and embed it in the file so we
429 * don't need the same hash table in every VM. This is slightly slower than
430 * a hash table with direct pointers to the items, but because it's shared
431 * there's less of a penalty for using a fairly sparse table.
433 typedef struct DexClassLookup {
434 int size; // total size, including "size"
435 int numEntries; // size of table[]; always power of 2
437 u4 classDescriptorHash; // class descriptor hash code
438 int classDescriptorOffset; // in bytes, from start of DEX
439 int classDefOffset; // in bytes, from start of DEX
444 * Map constant pool indices from one form to another. Some or all of these
447 * The map values are 16-bit unsigned values. If the values we map to
448 * require a larger range, we omit the mapping for that category (which
449 * requires that the lookup code recognize that the data will not be
450 * there for all DEX files in all categories.)
452 typedef struct DexIndexMap {
453 const u2* classMap; /* map, either expanding or reducing */
454 u4 classFullCount; /* same as typeIdsSize */
455 u4 classReducedCount; /* post-reduction count */
458 u4 methodReducedCount;
461 u4 fieldReducedCount;
464 u4 stringReducedCount;
468 * Header added by DEX optimization pass. Values are always written in
469 * local byte and structure padding. The first field (magic + version)
470 * is guaranteed to be present and directly readable for all expected
471 * compiler configurations; the rest is version-dependent.
473 * Try to keep this simple and fixed-size.
475 typedef struct DexOptHeader {
476 u1 magic[8]; /* includes version number */
478 u4 dexOffset; /* file offset of DEX header */
480 u4 depsOffset; /* offset of optimized DEX dependency table */
482 u4 auxOffset; /* file offset of pre-calc auxillary data */
485 u4 flags; /* some info flags */
487 u4 padding; /* induce 64-bit alignment */
490 #define DEX_FLAG_VERIFIED (1) /* tried to verify all classes */
491 #define DEX_OPT_FLAG_BIG (1<<1) /* swapped to big-endian */
492 #define DEX_OPT_FLAG_FIELDS (1<<2) /* field access optimized */
493 #define DEX_OPT_FLAG_INVOCATIONS (1<<3) /* method calls optimized */
495 #define DEX_INTERFACE_CACHE_SIZE 128 /* must be power of 2 */
498 * Structure representing a DEX file.
500 * Code should regard DexFile as opaque, using the API calls provided here
501 * to access specific structures.
503 typedef struct DexFile {
504 /* directly-mapped "opt" header */
505 const DexOptHeader* pOptHeader;
507 /* pointers to directly-mapped structs and arrays in base DEX */
508 const DexHeader* pHeader;
509 const DexStringId* pStringIds;
510 const DexTypeId* pTypeIds;
511 const DexFieldId* pFieldIds;
512 const DexMethodId* pMethodIds;
513 const DexProtoId* pProtoIds;
514 const DexClassDef* pClassDefs;
515 const DexLink* pLinkData;
517 /* mapped in "auxillary" section */
518 const DexClassLookup* pClassLookup;
520 /* mapped in "auxillary" section */
521 DexIndexMap indexMap;
523 /* points to start of DEX file data */
526 /* track memory overhead for auxillary structures */
529 /* additional app-specific data structures associated with the DEX */
534 * Utility function -- rounds up to the nearest power of 2.
536 u4 dexRoundUpPower2(u4 val);
539 * Parse an optimized or unoptimized .dex file sitting in memory.
541 * On success, return a newly-allocated DexFile.
543 DexFile* dexFileParse(const u1* data, size_t length, int flags);
545 /* bit values for "flags" argument to dexFileParse */
547 kDexParseDefault = 0,
548 kDexParseVerifyChecksum = 1,
552 * Correct the byte ordering in a memory-mapped DEX file. This is only
553 * required for code that opens "raw" DEX files, such as the DEX optimizer.
555 * Return 0 on success.
557 int dexFixByteOrdering(u1* addr, int len);
560 * Free a DexFile structure, along with any associated structures.
562 void dexFileFree(DexFile* pDexFile);
565 * Create class lookup table.
567 DexClassLookup* dexCreateClassLookup(DexFile* pDexFile);
570 * Find a class definition by descriptor.
572 const DexClassDef* dexFindClass(const DexFile* pFile, const char* descriptor);
575 * Set up the basic raw data pointers of a DexFile. This function isn't
576 * meant for general use.
578 void dexFileSetupBasicPointers(DexFile* pDexFile, const u1* data);
580 /* return the DexMapList of the file, if any */
581 DEX_INLINE const DexMapList* dexGetMap(const DexFile* pDexFile) {
582 u4 mapOff = pDexFile->pHeader->mapOff;
587 return (const DexMapList*) (pDexFile->baseAddr + mapOff);
591 /* return the const char* string data referred to by the given string_id */
592 DEX_INLINE const char* dexGetStringData(const DexFile* pDexFile,
593 const DexStringId* pStringId) {
594 const u1* ptr = pDexFile->baseAddr + pStringId->stringDataOff;
596 // Skip the uleb128 length.
597 while (*(ptr++) > 0x7f) /* empty */ ;
599 return (const char*) ptr;
601 /* return the StringId with the specified index */
602 DEX_INLINE const DexStringId* dexGetStringId(const DexFile* pDexFile, u4 idx) {
603 assert(idx < pDexFile->pHeader->stringIdsSize);
604 return &pDexFile->pStringIds[idx];
606 /* return the UTF-8 encoded string with the specified string_id index */
607 DEX_INLINE const char* dexStringById(const DexFile* pDexFile, u4 idx) {
608 const DexStringId* pStringId = dexGetStringId(pDexFile, idx);
609 return dexGetStringData(pDexFile, pStringId);
612 /* Return the UTF-8 encoded string with the specified string_id index,
613 * also filling in the UTF-16 size (number of 16-bit code points).*/
614 const char* dexStringAndSizeById(const DexFile* pDexFile, u4 idx,
617 /* return the TypeId with the specified index */
618 DEX_INLINE const DexTypeId* dexGetTypeId(const DexFile* pDexFile, u4 idx) {
619 assert(idx < pDexFile->pHeader->typeIdsSize);
620 return &pDexFile->pTypeIds[idx];
624 * Get the descriptor string associated with a given type index.
625 * The caller should not free() the returned string.
627 DEX_INLINE const char* dexStringByTypeIdx(const DexFile* pDexFile, u4 idx) {
628 const DexTypeId* typeId = dexGetTypeId(pDexFile, idx);
629 return dexStringById(pDexFile, typeId->descriptorIdx);
632 /* return the MethodId with the specified index */
633 DEX_INLINE const DexMethodId* dexGetMethodId(const DexFile* pDexFile, u4 idx) {
634 assert(idx < pDexFile->pHeader->methodIdsSize);
635 return &pDexFile->pMethodIds[idx];
638 /* return the FieldId with the specified index */
639 DEX_INLINE const DexFieldId* dexGetFieldId(const DexFile* pDexFile, u4 idx) {
640 assert(idx < pDexFile->pHeader->fieldIdsSize);
641 return &pDexFile->pFieldIds[idx];
644 /* return the ProtoId with the specified index */
645 DEX_INLINE const DexProtoId* dexGetProtoId(const DexFile* pDexFile, u4 idx) {
646 assert(idx < pDexFile->pHeader->protoIdsSize);
647 return &pDexFile->pProtoIds[idx];
651 * Get the parameter list from a ProtoId. The returns NULL if the ProtoId
652 * does not have a parameter list.
654 DEX_INLINE const DexTypeList* dexGetProtoParameters(
655 const DexFile *pDexFile, const DexProtoId* pProtoId) {
656 if (pProtoId->parametersOff == 0) {
659 return (const DexTypeList*)
660 (pDexFile->baseAddr + pProtoId->parametersOff);
663 /* return the ClassDef with the specified index */
664 DEX_INLINE const DexClassDef* dexGetClassDef(const DexFile* pDexFile, u4 idx) {
665 assert(idx < pDexFile->pHeader->classDefsSize);
666 return &pDexFile->pClassDefs[idx];
669 /* get the interface list for a DexClass */
670 DEX_INLINE const DexTypeList* dexGetInterfacesList(const DexFile* pDexFile,
671 const DexClassDef* pClassDef)
673 if (pClassDef->interfacesOff == 0)
675 return (const DexTypeList*)
676 (pDexFile->baseAddr + pClassDef->interfacesOff);
678 /* return the Nth entry in a DexTypeList. */
679 DEX_INLINE const DexTypeItem* dexGetTypeItem(const DexTypeList* pList,
682 assert(idx < pList->size);
683 return &pList->list[idx];
685 /* return the type_idx for the Nth entry in a TypeList */
686 DEX_INLINE u4 dexTypeListGetIdx(const DexTypeList* pList, u4 idx) {
687 const DexTypeItem* pItem = dexGetTypeItem(pList, idx);
688 return pItem->typeIdx;
691 /* get the static values list for a DexClass */
692 DEX_INLINE const DexEncodedArray* dexGetStaticValuesList(
693 const DexFile* pDexFile, const DexClassDef* pClassDef)
695 if (pClassDef->staticValuesOff == 0)
697 return (const DexEncodedArray*)
698 (pDexFile->baseAddr + pClassDef->staticValuesOff);
701 /* get the annotations directory item for a DexClass */
702 DEX_INLINE const DexAnnotationsDirectoryItem* dexGetAnnotationsDirectoryItem(
703 const DexFile* pDexFile, const DexClassDef* pClassDef)
705 if (pClassDef->annotationsOff == 0)
707 return (const DexAnnotationsDirectoryItem*)
708 (pDexFile->baseAddr + pClassDef->annotationsOff);
711 /* get the source file string */
712 DEX_INLINE const char* dexGetSourceFile(
713 const DexFile* pDexFile, const DexClassDef* pClassDef)
715 if (pClassDef->sourceFileIdx == 0xffffffff)
717 return dexStringById(pDexFile, pClassDef->sourceFileIdx);
720 /* Get the list of "tries" for the given DexCode. */
721 DEX_INLINE const DexTry* dexGetTries(const DexCode* pCode) {
722 const u2* insnsEnd = &pCode->insns[pCode->insnsSize];
724 // Round to four bytes.
725 if ((((u4) insnsEnd) & 3) != 0) {
729 return (const DexTry*) insnsEnd;
732 /* Get the base of the encoded data for the given DexCode. */
733 DEX_INLINE const u1* dexGetCatchHandlerData(const DexCode* pCode) {
734 const DexTry* pTries = dexGetTries(pCode);
735 return (const u1*) &pTries[pCode->triesSize];
738 DEX_INLINE const u1* dexGetDebugInfoStream(const DexFile* pDexFile,
739 const DexCode* pCode)
741 if (pCode->debugInfoOff == 0) {
744 return pDexFile->baseAddr + pCode->debugInfoOff;
749 * Callback for "new position table entry".
750 * Returning non-0 causes the decoder to stop early.
752 typedef int (*DexDebugNewPositionCb)(void *cnxt, u4 address, u4 lineNum);
755 * Callback for "new locals table entry". "signature" is an empty string
756 * if no signature is available for an entry.
758 typedef void (*DexDebugNewLocalCb)(void *cnxt, u2 reg, u4 startAddress,
759 u4 endAddress, const char *name, const char *descriptor,
760 const char *signature);
763 * Decode debug info for method.
765 * posCb is called in ascending address order.
766 * localCb is called in order of ascending end address.
768 void dexDecodeDebugInfo(
769 const DexFile* pDexFile,
770 const DexCode* pDexCode,
771 const char* classDescriptor,
774 DexDebugNewPositionCb posCb, DexDebugNewLocalCb localCb,
777 /* DexClassDef convenience - get class descriptor */
778 DEX_INLINE const char* dexGetClassDescriptor(const DexFile* pDexFile,
779 const DexClassDef* pClassDef)
781 return dexStringByTypeIdx(pDexFile, pClassDef->classIdx);
784 /* DexClassDef convenience - get superclass descriptor */
785 DEX_INLINE const char* dexGetSuperClassDescriptor(const DexFile* pDexFile,
786 const DexClassDef* pClassDef)
788 if (pClassDef->superclassIdx == 0)
790 return dexStringByTypeIdx(pDexFile, pClassDef->superclassIdx);
793 /* DexClassDef convenience - get class_data_item pointer */
794 DEX_INLINE const u1* dexGetClassData(const DexFile* pDexFile,
795 const DexClassDef* pClassDef)
797 if (pClassDef->classDataOff == 0)
799 return (const u1*) (pDexFile->baseAddr + pClassDef->classDataOff);
802 /* Get an annotation set at a particular offset. */
803 DEX_INLINE const DexAnnotationSetItem* dexGetAnnotationSetItem(
804 const DexFile* pDexFile, u4 offset)
806 return (const DexAnnotationSetItem*) (pDexFile->baseAddr + offset);
808 /* get the class' annotation set */
809 DEX_INLINE const DexAnnotationSetItem* dexGetClassAnnotationSet(
810 const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
812 if (pAnnoDir->classAnnotationsOff == 0)
814 return dexGetAnnotationSetItem(pDexFile, pAnnoDir->classAnnotationsOff);
817 /* get the class' field annotation list */
818 DEX_INLINE const DexFieldAnnotationsItem* dexGetFieldAnnotations(
819 const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
821 if (pAnnoDir->fieldsSize == 0)
824 // Skip past the header to the start of the field annotations.
825 return (const DexFieldAnnotationsItem*) &pAnnoDir[1];
828 /* get field annotation list size */
829 DEX_INLINE int dexGetFieldAnnotationsSize(const DexFile* pDexFile,
830 const DexAnnotationsDirectoryItem* pAnnoDir)
832 return pAnnoDir->fieldsSize;
835 /* return a pointer to the field's annotation set */
836 DEX_INLINE const DexAnnotationSetItem* dexGetFieldAnnotationSetItem(
837 const DexFile* pDexFile, const DexFieldAnnotationsItem* pItem)
839 return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
842 /* get the class' method annotation list */
843 DEX_INLINE const DexMethodAnnotationsItem* dexGetMethodAnnotations(
844 const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
846 if (pAnnoDir->methodsSize == 0)
850 * Skip past the header and field annotations to the start of the
851 * method annotations.
853 const u1* addr = (const u1*) &pAnnoDir[1];
854 addr += pAnnoDir->fieldsSize * sizeof (DexFieldAnnotationsItem);
855 return (const DexMethodAnnotationsItem*) addr;
858 /* get method annotation list size */
859 DEX_INLINE int dexGetMethodAnnotationsSize(const DexFile* pDexFile,
860 const DexAnnotationsDirectoryItem* pAnnoDir)
862 return pAnnoDir->methodsSize;
865 /* return a pointer to the method's annotation set */
866 DEX_INLINE const DexAnnotationSetItem* dexGetMethodAnnotationSetItem(
867 const DexFile* pDexFile, const DexMethodAnnotationsItem* pItem)
869 return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
872 /* get the class' parameter annotation list */
873 DEX_INLINE const DexParameterAnnotationsItem* dexGetParameterAnnotations(
874 const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
876 if (pAnnoDir->parametersSize == 0)
880 * Skip past the header, field annotations, and method annotations
881 * to the start of the parameter annotations.
883 const u1* addr = (const u1*) &pAnnoDir[1];
884 addr += pAnnoDir->fieldsSize * sizeof (DexFieldAnnotationsItem);
885 addr += pAnnoDir->methodsSize * sizeof (DexMethodAnnotationsItem);
886 return (const DexParameterAnnotationsItem*) addr;
889 /* get method annotation list size */
890 DEX_INLINE int dexGetParameterAnnotationsSize(const DexFile* pDexFile,
891 const DexAnnotationsDirectoryItem* pAnnoDir)
893 return pAnnoDir->parametersSize;
896 /* return the parameter annotation ref list */
897 DEX_INLINE const DexAnnotationSetRefList* dexGetParameterAnnotationSetRefList(
898 const DexFile* pDexFile, const DexParameterAnnotationsItem* pItem)
900 return (const DexAnnotationSetRefList*)
901 (pDexFile->baseAddr + pItem->annotationsOff);
904 /* get method annotation list size */
905 DEX_INLINE int dexGetParameterAnnotationSetRefSize(const DexFile* pDexFile,
906 const DexParameterAnnotationsItem* pItem)
908 if (pItem->annotationsOff == 0)
910 return dexGetParameterAnnotationSetRefList(pDexFile, pItem)->size;
913 /* return the Nth entry from an annotation set ref list */
914 DEX_INLINE const DexAnnotationSetRefItem* dexGetParameterAnnotationSetRef(
915 const DexAnnotationSetRefList* pList, u4 idx)
917 assert(idx < pList->size);
918 return &pList->list[idx];
921 /* given a DexAnnotationSetRefItem, return the DexAnnotationSetItem */
922 DEX_INLINE const DexAnnotationSetItem* dexGetSetRefItemItem(
923 const DexFile* pDexFile, const DexAnnotationSetRefItem* pItem)
925 return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
928 /* return the Nth annotation offset from a DexAnnotationSetItem */
929 DEX_INLINE u4 dexGetAnnotationOff(
930 const DexAnnotationSetItem* pAnnoSet, u4 idx)
932 assert(idx < pAnnoSet->size);
933 return pAnnoSet->entries[idx];
936 /* return the Nth annotation item from a DexAnnotationSetItem */
937 DEX_INLINE const DexAnnotationItem* dexGetAnnotationItem(
938 const DexFile* pDexFile, const DexAnnotationSetItem* pAnnoSet, u4 idx)
940 return (const DexAnnotationItem*)
941 (pDexFile->baseAddr + dexGetAnnotationOff(pAnnoSet, idx));
946 * ===========================================================================
948 * ===========================================================================
952 * Retrieve the next UTF-16 character from a UTF-8 string.
954 * Advances "*pUtf8Ptr" to the start of the next character.
956 * WARNING: If a string is corrupted by dropping a '\0' in the middle
957 * of a 3-byte sequence, you can end up overrunning the buffer with
958 * reads (and possibly with the writes if the length was computed and
959 * cached before the damage). For performance reasons, this function
960 * assumes that the string being parsed is known to be valid (e.g., by
961 * already being verified). Most strings we process here are coming
962 * out of dex files or other internal translations, so the only real
963 * risk comes from the JNI NewStringUTF call.
965 DEX_INLINE u2 dexGetUtf16FromUtf8(const char** pUtf8Ptr)
967 unsigned int one, two, three;
969 one = *(*pUtf8Ptr)++;
970 if ((one & 0x80) != 0) {
971 /* two- or three-byte encoding */
972 two = *(*pUtf8Ptr)++;
973 if ((one & 0x20) != 0) {
974 /* three-byte encoding */
975 three = *(*pUtf8Ptr)++;
976 return ((one & 0x0f) << 12) |
977 ((two & 0x3f) << 6) |
980 /* two-byte encoding */
981 return ((one & 0x1f) << 6) |
985 /* one-byte encoding */
990 /* Compare two '\0'-terminated modified UTF-8 strings, using Unicode
991 * code point values for comparison. This treats different encodings
992 * for the same code point as equivalent, except that only a real '\0'
993 * byte is considered the string terminator. The return value is as
995 int dexUtf8Cmp(const char* s1, const char* s2);
998 /* for dexIsValidMemberNameUtf8(), a bit vector indicating valid low ascii */
999 extern u4 DEX_MEMBER_VALID_LOW_ASCII[4];
1001 /* Helper for dexIsValidMemberUtf8(); do not call directly. */
1002 bool dexIsValidMemberNameUtf8_0(const char** pUtf8Ptr);
1004 /* Return whether the pointed-at modified-UTF-8 encoded character is
1005 * valid as part of a member name, updating the pointer to point past
1006 * the consumed character. This will consume two encoded UTF-16 code
1007 * points if the character is encoded as a surrogate pair. Also, if
1008 * this function returns false, then the given pointer may only have
1009 * been partially advanced. */
1010 DEX_INLINE bool dexIsValidMemberNameUtf8(const char** pUtf8Ptr) {
1011 u1 c = (u1) **pUtf8Ptr;
1013 // It's low-ascii, so check the table.
1014 u4 wordIdx = c >> 5;
1015 u4 bitIdx = c & 0x1f;
1017 return (DEX_MEMBER_VALID_LOW_ASCII[wordIdx] & (1 << bitIdx)) != 0;
1021 * It's a multibyte encoded character. Call a non-inline function
1022 * for the heavy lifting.
1024 return dexIsValidMemberNameUtf8_0(pUtf8Ptr);
1027 /* Return whether the given string is a valid field or method name. */
1028 bool dexIsValidMemberName(const char* s);
1030 /* Return whether the given string is a valid type descriptor. */
1031 bool dexIsValidTypeDescriptor(const char* s);
1033 /* Return whether the given string is a valid reference descriptor. This
1034 * is true if dexIsValidTypeDescriptor() returns true and the descriptor
1035 * is for a class or array and not a primitive type. */
1036 bool dexIsReferenceDescriptor(const char* s);
1038 /* Return whether the given string is a valid class descriptor. This
1039 * is true if dexIsValidTypeDescriptor() returns true and the descriptor
1040 * is for a class and not an array or primitive type. */
1041 bool dexIsClassDescriptor(const char* s);
1043 /* Return whether the given string is a valid field type descriptor. This
1044 * is true if dexIsValidTypeDescriptor() returns true and the descriptor
1045 * is for anything but "void". */
1046 bool dexIsFieldDescriptor(const char* s);
1048 #endif /*_LIBDEX_DEXFILE*/