DexFile.h revision d394371bd84bacc51e96e2d2eacb8549d9110b1e 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
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
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17/*
18 * Access .dex (Dalvik Executable Format) files.  The code here assumes that
19 * the DEX file has been rewritten (byte-swapped, word-aligned) and that
20 * the contents can be directly accessed as a collection of C arrays.  Please
21 * see docs/dalvik/dex-format.html for a detailed description.
22 *
23 * The structure and field names were chosen to match those in the DEX spec.
24 *
25 * It's generally assumed that the DEX file will be stored in shared memory,
26 * obviating the need to copy code and constant pool entries into newly
27 * allocated storage.  Maintaining local pointers to items in the shared area
28 * is valid and encouraged.
29 *
30 * All memory-mapped structures are 32-bit aligned unless otherwise noted.
31 */
32
33#ifndef _LIBDEX_DEXFILE
34#define _LIBDEX_DEXFILE
35
36#include "vm/Common.h"      // basic type defs, e.g. u1/u2/u4/u8, and LOG
37#include "libdex/SysUtil.h"
38
39/*
40 * gcc-style inline management -- ensures we have a copy of all functions
41 * in the library, so code that links against us will work whether or not
42 * it was built with optimizations enabled.
43 */
44#ifndef _DEX_GEN_INLINES             /* only defined by DexInlines.c */
45# define DEX_INLINE extern __inline__
46#else
47# define DEX_INLINE
48#endif
49
50/* DEX file magic number */
51#define DEX_MAGIC       "dex\n"
52/* version, encoded in 4 bytes of ASCII */
53#define DEX_MAGIC_VERS  "035\0"
54
55/* same, but for optimized DEX header */
56#define DEX_OPT_MAGIC   "dey\n"
57#define DEX_OPT_MAGIC_VERS  "036\0"
58
59#define DEX_DEP_MAGIC   "deps"
60
61/*
62 * 160-bit SHA-1 digest.
63 */
64enum { kSHA1DigestLen = 20,
65       kSHA1DigestOutputLen = kSHA1DigestLen*2 +1 };
66
67/* general constants */
68enum {
69    kDexEndianConstant = 0x12345678,    /* the endianness indicator */
70    kDexNoIndex = 0xffffffff,           /* not a valid index value */
71};
72
73/*
74 * access flags and masks; the "standard" ones are all <= 0x4000
75 *
76 * Note: There are related declarations in vm/oo/Object.h in the ClassFlags
77 * enum.
78 */
79enum {
80    ACC_PUBLIC       = 0x00000001,       // class, field, method, ic
81    ACC_PRIVATE      = 0x00000002,       // field, method, ic
82    ACC_PROTECTED    = 0x00000004,       // field, method, ic
83    ACC_STATIC       = 0x00000008,       // field, method, ic
84    ACC_FINAL        = 0x00000010,       // class, field, method, ic
85    ACC_SYNCHRONIZED = 0x00000020,       // method (only allowed on natives)
86    ACC_SUPER        = 0x00000020,       // class (not used in Dalvik)
87    ACC_VOLATILE     = 0x00000040,       // field
88    ACC_BRIDGE       = 0x00000040,       // method (1.5)
89    ACC_TRANSIENT    = 0x00000080,       // field
90    ACC_VARARGS      = 0x00000080,       // method (1.5)
91    ACC_NATIVE       = 0x00000100,       // method
92    ACC_INTERFACE    = 0x00000200,       // class, ic
93    ACC_ABSTRACT     = 0x00000400,       // class, method, ic
94    ACC_STRICT       = 0x00000800,       // method
95    ACC_SYNTHETIC    = 0x00001000,       // field, method, ic
96    ACC_ANNOTATION   = 0x00002000,       // class, ic (1.5)
97    ACC_ENUM         = 0x00004000,       // class, field, ic (1.5)
98    ACC_CONSTRUCTOR  = 0x00010000,       // method (Dalvik only)
99    ACC_DECLARED_SYNCHRONIZED =
100                       0x00020000,       // method (Dalvik only)
101    ACC_CLASS_MASK =
102        (ACC_PUBLIC | ACC_FINAL | ACC_INTERFACE | ACC_ABSTRACT
103                | ACC_SYNTHETIC | ACC_ANNOTATION | ACC_ENUM),
104    ACC_INNER_CLASS_MASK =
105        (ACC_CLASS_MASK | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC),
106    ACC_FIELD_MASK =
107        (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL
108                | ACC_VOLATILE | ACC_TRANSIENT | ACC_SYNTHETIC | ACC_ENUM),
109    ACC_METHOD_MASK =
110        (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL
111                | ACC_SYNCHRONIZED | ACC_BRIDGE | ACC_VARARGS | ACC_NATIVE
112                | ACC_ABSTRACT | ACC_STRICT | ACC_SYNTHETIC | ACC_CONSTRUCTOR
113                | ACC_DECLARED_SYNCHRONIZED),
114};
115
116/* annotation constants */
117enum {
118    kDexVisibilityBuild         = 0x00,     /* annotation visibility */
119    kDexVisibilityRuntime       = 0x01,
120    kDexVisibilitySystem        = 0x02,
121
122    kDexAnnotationByte          = 0x00,
123    kDexAnnotationShort         = 0x02,
124    kDexAnnotationChar          = 0x03,
125    kDexAnnotationInt           = 0x04,
126    kDexAnnotationLong          = 0x06,
127    kDexAnnotationFloat         = 0x10,
128    kDexAnnotationDouble        = 0x11,
129    kDexAnnotationString        = 0x17,
130    kDexAnnotationType          = 0x18,
131    kDexAnnotationField         = 0x19,
132    kDexAnnotationMethod        = 0x1a,
133    kDexAnnotationEnum          = 0x1b,
134    kDexAnnotationArray         = 0x1c,
135    kDexAnnotationAnnotation    = 0x1d,
136    kDexAnnotationNull          = 0x1e,
137    kDexAnnotationBoolean       = 0x1f,
138
139    kDexAnnotationValueTypeMask = 0x1f,     /* low 5 bits */
140    kDexAnnotationValueArgShift = 5,
141};
142
143/* map item type codes */
144enum {
145    kDexTypeHeaderItem               = 0x0000,
146    kDexTypeStringIdItem             = 0x0001,
147    kDexTypeTypeIdItem               = 0x0002,
148    kDexTypeProtoIdItem              = 0x0003,
149    kDexTypeFieldIdItem              = 0x0004,
150    kDexTypeMethodIdItem             = 0x0005,
151    kDexTypeClassDefItem             = 0x0006,
152    kDexTypeMapList                  = 0x1000,
153    kDexTypeTypeList                 = 0x1001,
154    kDexTypeAnnotationSetRefList     = 0x1002,
155    kDexTypeAnnotationSetItem        = 0x1003,
156    kDexTypeClassDataItem            = 0x2000,
157    kDexTypeCodeItem                 = 0x2001,
158    kDexTypeStringDataItem           = 0x2002,
159    kDexTypeDebugInfoItem            = 0x2003,
160    kDexTypeAnnotationItem           = 0x2004,
161    kDexTypeEncodedArrayItem         = 0x2005,
162    kDexTypeAnnotationsDirectoryItem = 0x2006,
163};
164
165/* auxillary data section chunk codes */
166enum {
167    kDexChunkClassLookup            = 0x434c4b50,   /* CLKP */
168    kDexChunkRegisterMaps           = 0x524d4150,   /* RMAP */
169
170    kDexChunkEnd                    = 0x41454e44,   /* AEND */
171};
172
173/* debug info opcodes and constants */
174enum {
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,
184    DBG_SET_FILE             = 0x09,
185    DBG_FIRST_SPECIAL        = 0x0a,
186    DBG_LINE_BASE            = -4,
187    DBG_LINE_RANGE           = 15,
188};
189
190/*
191 * Direct-mapped "header_item" struct.
192 */
193typedef 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 */
199    u4  endianTag;
200    u4  linkSize;
201    u4  linkOff;
202    u4  mapOff;
203    u4  stringIdsSize;
204    u4  stringIdsOff;
205    u4  typeIdsSize;
206    u4  typeIdsOff;
207    u4  protoIdsSize;
208    u4  protoIdsOff;
209    u4  fieldIdsSize;
210    u4  fieldIdsOff;
211    u4  methodIdsSize;
212    u4  methodIdsOff;
213    u4  classDefsSize;
214    u4  classDefsOff;
215    u4  dataSize;
216    u4  dataOff;
217} DexHeader;
218
219/*
220 * Direct-mapped "map_item".
221 */
222typedef struct DexMapItem {
223    u2  type;              /* type code (see kDexType* above) */
224    u2  unused;
225    u4  size;              /* count of items of the indicated type */
226    u4  offset;            /* file offset to the start of data */
227} DexMapItem;
228
229/*
230 * Direct-mapped "map_list".
231 */
232typedef struct DexMapList {
233    u4  size;               /* #of entries in list */
234    DexMapItem list[1];     /* entries */
235} DexMapList;
236
237/*
238 * Direct-mapped "string_id_item".
239 */
240typedef struct DexStringId {
241    u4  stringDataOff;      /* file offset to string_data_item */
242} DexStringId;
243
244/*
245 * Direct-mapped "type_id_item".
246 */
247typedef struct DexTypeId {
248    u4  descriptorIdx;      /* index into stringIds list for type descriptor */
249} DexTypeId;
250
251/*
252 * Direct-mapped "field_id_item".
253 */
254typedef 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 */
258} DexFieldId;
259
260/*
261 * Direct-mapped "method_id_item".
262 */
263typedef 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 */
267} DexMethodId;
268
269/*
270 * Direct-mapped "proto_id_item".
271 */
272typedef 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 */
276} DexProtoId;
277
278/*
279 * Direct-mapped "class_def_item".
280 */
281typedef struct DexClassDef {
282    u4  classIdx;           /* index into typeIds for this class */
283    u4  accessFlags;
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 */
290} DexClassDef;
291
292/*
293 * Direct-mapped "type_item".
294 */
295typedef struct DexTypeItem {
296    u2  typeIdx;            /* index into typeIds */
297} DexTypeItem;
298
299/*
300 * Direct-mapped "type_list".
301 */
302typedef struct DexTypeList {
303    u4  size;               /* #of entries in list */
304    DexTypeItem list[1];    /* entries */
305} DexTypeList;
306
307/*
308 * Direct-mapped "code_item".
309 *
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.
313 */
314typedef struct DexCode {
315    u2  registersSize;
316    u2  insSize;
317    u2  outsSize;
318    u2  triesSize;
319    u4  debugInfoOff;       /* file offset to debug info stream */
320    u4  insnsSize;          /* size of the insns array, in u2 units */
321    u2  insns[1];
322    /* followed by optional u2 padding */
323    /* followed by try_item[triesSize] */
324    /* followed by uleb128 handlersSize */
325    /* followed by catch_handler_item[handlersSize] */
326} DexCode;
327
328/*
329 * Direct-mapped "try_item".
330 */
331typedef 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 */
335} DexTry;
336
337/*
338 * Link table.  Currently undefined.
339 */
340typedef struct DexLink {
341    u1  bleargh;
342} DexLink;
343
344
345/*
346 * Direct-mapped "annotations_directory_item".
347 */
348typedef 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;
357
358/*
359 * Direct-mapped "field_annotations_item".
360 */
361typedef struct DexFieldAnnotationsItem {
362    u4  fieldIdx;
363    u4  annotationsOff;             /* offset to DexAnnotationSetItem */
364} DexFieldAnnotationsItem;
365
366/*
367 * Direct-mapped "method_annotations_item".
368 */
369typedef struct DexMethodAnnotationsItem {
370    u4  methodIdx;
371    u4  annotationsOff;             /* offset to DexAnnotationSetItem */
372} DexMethodAnnotationsItem;
373
374/*
375 * Direct-mapped "parameter_annotations_item".
376 */
377typedef struct DexParameterAnnotationsItem {
378    u4  methodIdx;
379    u4  annotationsOff;             /* offset to DexAnotationSetRefList */
380} DexParameterAnnotationsItem;
381
382/*
383 * Direct-mapped "annotation_set_ref_item".
384 */
385typedef struct DexAnnotationSetRefItem {
386    u4  annotationsOff;             /* offset to DexAnnotationSetItem */
387} DexAnnotationSetRefItem;
388
389/*
390 * Direct-mapped "annotation_set_ref_list".
391 */
392typedef struct DexAnnotationSetRefList {
393    u4  size;
394    DexAnnotationSetRefItem list[1];
395} DexAnnotationSetRefList;
396
397/*
398 * Direct-mapped "anotation_set_item".
399 */
400typedef struct DexAnnotationSetItem {
401    u4  size;
402    u4  entries[1];                 /* offset to DexAnnotationItem */
403} DexAnnotationSetItem;
404
405/*
406 * Direct-mapped "annotation_item".
407 *
408 * NOTE: this structure is byte-aligned.
409 */
410typedef struct DexAnnotationItem {
411    u1  visibility;
412    u1  annotation[1];              /* data in encoded_annotation format */
413} DexAnnotationItem;
414
415/*
416 * Direct-mapped "encoded_array".
417 *
418 * NOTE: this structure is byte-aligned.
419 */
420typedef struct DexEncodedArray {
421    u1  array[1];                   /* data in encoded_array format */
422} DexEncodedArray;
423
424/*
425 * Lookup table for classes.  It provides a mapping from class name to
426 * class definition.  Used by dexFindClass().
427 *
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.
432 */
433typedef struct DexClassLookup {
434    int     size;                       // total size, including "size"
435    int     numEntries;                 // size of table[]; always power of 2
436    struct {
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
440    } table[1];
441} DexClassLookup;
442
443/*
444 * Header added by DEX optimization pass.  Values are always written in
445 * local byte and structure padding.  The first field (magic + version)
446 * is guaranteed to be present and directly readable for all expected
447 * compiler configurations; the rest is version-dependent.
448 *
449 * Try to keep this simple and fixed-size.
450 */
451typedef struct DexOptHeader {
452    u1  magic[8];           /* includes version number */
453
454    u4  dexOffset;          /* file offset of DEX header */
455    u4  dexLength;
456    u4  depsOffset;         /* offset of optimized DEX dependency table */
457    u4  depsLength;
458    u4  optOffset;          /* file offset of optimized data tables */
459    u4  optLength;
460
461    u4  flags;              /* some info flags */
462    u4  checksum;           /* adler32 checksum covering deps/opt */
463
464    /* pad for 64-bit alignment if necessary */
465} DexOptHeader;
466
467#define DEX_FLAG_VERIFIED           (1)     /* tried to verify all classes */
468#define DEX_OPT_FLAG_BIG            (1<<1)  /* swapped to big-endian */
469#define DEX_OPT_FLAG_FIELDS         (1<<2)  /* field access optimized */
470#define DEX_OPT_FLAG_INVOCATIONS    (1<<3)  /* method calls optimized */
471
472#define DEX_INTERFACE_CACHE_SIZE    128     /* must be power of 2 */
473
474/*
475 * Structure representing a DEX file.
476 *
477 * Code should regard DexFile as opaque, using the API calls provided here
478 * to access specific structures.
479 */
480typedef struct DexFile {
481    /* directly-mapped "opt" header */
482    const DexOptHeader* pOptHeader;
483
484    /* pointers to directly-mapped structs and arrays in base DEX */
485    const DexHeader*    pHeader;
486    const DexStringId*  pStringIds;
487    const DexTypeId*    pTypeIds;
488    const DexFieldId*   pFieldIds;
489    const DexMethodId*  pMethodIds;
490    const DexProtoId*   pProtoIds;
491    const DexClassDef*  pClassDefs;
492    const DexLink*      pLinkData;
493
494    /*
495     * These are mapped out of the "auxillary" section, and may not be
496     * included in the file.
497     */
498    const DexClassLookup* pClassLookup;
499    const void*         pRegisterMapPool;       // RegisterMapClassPool
500
501    /* points to start of DEX file data */
502    const u1*           baseAddr;
503
504    /* track memory overhead for auxillary structures */
505    int                 overhead;
506
507    /* additional app-specific data structures associated with the DEX */
508    //void*               auxData;
509} DexFile;
510
511/*
512 * Utility function -- rounds up to the nearest power of 2.
513 */
514u4 dexRoundUpPower2(u4 val);
515
516/*
517 * Parse an optimized or unoptimized .dex file sitting in memory.
518 *
519 * On success, return a newly-allocated DexFile.
520 */
521DexFile* dexFileParse(const u1* data, size_t length, int flags);
522
523/* bit values for "flags" argument to dexFileParse */
524enum {
525    kDexParseDefault            = 0,
526    kDexParseVerifyChecksum     = 1,
527    kDexParseContinueOnError    = (1 << 1),
528};
529
530/*
531 * Fix the byte ordering of all fields in the DEX file, and do
532 * structural verification. This is only required for code that opens
533 * "raw" DEX files, such as the DEX optimizer.
534 *
535 * Return 0 on success.
536 */
537int dexSwapAndVerify(u1* addr, int len);
538
539/*
540 * Detect the file type of the given memory buffer via magic number.
541 * Call dexSwapAndVerify() on an unoptimized DEX file, do nothing
542 * but return successfully on an optimized DEX file, and report an
543 * error for all other cases.
544 *
545 * Return 0 on success.
546 */
547int dexSwapAndVerifyIfNecessary(u1* addr, int len);
548
549/*
550 * Compute DEX checksum.
551 */
552u4 dexComputeChecksum(const DexHeader* pHeader);
553
554/*
555 * Free a DexFile structure, along with any associated structures.
556 */
557void dexFileFree(DexFile* pDexFile);
558
559/*
560 * Create class lookup table.
561 */
562DexClassLookup* dexCreateClassLookup(DexFile* pDexFile);
563
564/*
565 * Find a class definition by descriptor.
566 */
567const DexClassDef* dexFindClass(const DexFile* pFile, const char* descriptor);
568
569/*
570 * Set up the basic raw data pointers of a DexFile. This function isn't
571 * meant for general use.
572 */
573void dexFileSetupBasicPointers(DexFile* pDexFile, const u1* data);
574
575/* return the DexMapList of the file, if any */
576DEX_INLINE const DexMapList* dexGetMap(const DexFile* pDexFile) {
577    u4 mapOff = pDexFile->pHeader->mapOff;
578
579    if (mapOff == 0) {
580        return NULL;
581    } else {
582        return (const DexMapList*) (pDexFile->baseAddr + mapOff);
583    }
584}
585
586/* return the const char* string data referred to by the given string_id */
587DEX_INLINE const char* dexGetStringData(const DexFile* pDexFile,
588        const DexStringId* pStringId) {
589    const u1* ptr = pDexFile->baseAddr + pStringId->stringDataOff;
590
591    // Skip the uleb128 length.
592    while (*(ptr++) > 0x7f) /* empty */ ;
593
594    return (const char*) ptr;
595}
596/* return the StringId with the specified index */
597DEX_INLINE const DexStringId* dexGetStringId(const DexFile* pDexFile, u4 idx) {
598    assert(idx < pDexFile->pHeader->stringIdsSize);
599    return &pDexFile->pStringIds[idx];
600}
601/* return the UTF-8 encoded string with the specified string_id index */
602DEX_INLINE const char* dexStringById(const DexFile* pDexFile, u4 idx) {
603    const DexStringId* pStringId = dexGetStringId(pDexFile, idx);
604    return dexGetStringData(pDexFile, pStringId);
605}
606
607/* Return the UTF-8 encoded string with the specified string_id index,
608 * also filling in the UTF-16 size (number of 16-bit code points).*/
609const char* dexStringAndSizeById(const DexFile* pDexFile, u4 idx,
610        u4* utf16Size);
611
612/* return the TypeId with the specified index */
613DEX_INLINE const DexTypeId* dexGetTypeId(const DexFile* pDexFile, u4 idx) {
614    assert(idx < pDexFile->pHeader->typeIdsSize);
615    return &pDexFile->pTypeIds[idx];
616}
617
618/*
619 * Get the descriptor string associated with a given type index.
620 * The caller should not free() the returned string.
621 */
622DEX_INLINE const char* dexStringByTypeIdx(const DexFile* pDexFile, u4 idx) {
623    const DexTypeId* typeId = dexGetTypeId(pDexFile, idx);
624    return dexStringById(pDexFile, typeId->descriptorIdx);
625}
626
627/* return the MethodId with the specified index */
628DEX_INLINE const DexMethodId* dexGetMethodId(const DexFile* pDexFile, u4 idx) {
629    assert(idx < pDexFile->pHeader->methodIdsSize);
630    return &pDexFile->pMethodIds[idx];
631}
632
633/* return the FieldId with the specified index */
634DEX_INLINE const DexFieldId* dexGetFieldId(const DexFile* pDexFile, u4 idx) {
635    assert(idx < pDexFile->pHeader->fieldIdsSize);
636    return &pDexFile->pFieldIds[idx];
637}
638
639/* return the ProtoId with the specified index */
640DEX_INLINE const DexProtoId* dexGetProtoId(const DexFile* pDexFile, u4 idx) {
641    assert(idx < pDexFile->pHeader->protoIdsSize);
642    return &pDexFile->pProtoIds[idx];
643}
644
645/*
646 * Get the parameter list from a ProtoId. The returns NULL if the ProtoId
647 * does not have a parameter list.
648 */
649DEX_INLINE const DexTypeList* dexGetProtoParameters(
650    const DexFile *pDexFile, const DexProtoId* pProtoId) {
651    if (pProtoId->parametersOff == 0) {
652        return NULL;
653    }
654    return (const DexTypeList*)
655        (pDexFile->baseAddr + pProtoId->parametersOff);
656}
657
658/* return the ClassDef with the specified index */
659DEX_INLINE const DexClassDef* dexGetClassDef(const DexFile* pDexFile, u4 idx) {
660    assert(idx < pDexFile->pHeader->classDefsSize);
661    return &pDexFile->pClassDefs[idx];
662}
663
664/* given a ClassDef pointer, recover its index */
665DEX_INLINE u4 dexGetIndexForClassDef(const DexFile* pDexFile,
666    const DexClassDef* pClassDef)
667{
668    assert(pClassDef >= pDexFile->pClassDefs &&
669           pClassDef < pDexFile->pClassDefs + pDexFile->pHeader->classDefsSize);
670    return pClassDef - pDexFile->pClassDefs;
671}
672
673/* get the interface list for a DexClass */
674DEX_INLINE const DexTypeList* dexGetInterfacesList(const DexFile* pDexFile,
675    const DexClassDef* pClassDef)
676{
677    if (pClassDef->interfacesOff == 0)
678        return NULL;
679    return (const DexTypeList*)
680        (pDexFile->baseAddr + pClassDef->interfacesOff);
681}
682/* return the Nth entry in a DexTypeList. */
683DEX_INLINE const DexTypeItem* dexGetTypeItem(const DexTypeList* pList,
684    u4 idx)
685{
686    assert(idx < pList->size);
687    return &pList->list[idx];
688}
689/* return the type_idx for the Nth entry in a TypeList */
690DEX_INLINE u4 dexTypeListGetIdx(const DexTypeList* pList, u4 idx) {
691    const DexTypeItem* pItem = dexGetTypeItem(pList, idx);
692    return pItem->typeIdx;
693}
694
695/* get the static values list for a DexClass */
696DEX_INLINE const DexEncodedArray* dexGetStaticValuesList(
697    const DexFile* pDexFile, const DexClassDef* pClassDef)
698{
699    if (pClassDef->staticValuesOff == 0)
700        return NULL;
701    return (const DexEncodedArray*)
702        (pDexFile->baseAddr + pClassDef->staticValuesOff);
703}
704
705/* get the annotations directory item for a DexClass */
706DEX_INLINE const DexAnnotationsDirectoryItem* dexGetAnnotationsDirectoryItem(
707    const DexFile* pDexFile, const DexClassDef* pClassDef)
708{
709    if (pClassDef->annotationsOff == 0)
710        return NULL;
711    return (const DexAnnotationsDirectoryItem*)
712        (pDexFile->baseAddr + pClassDef->annotationsOff);
713}
714
715/* get the source file string */
716DEX_INLINE const char* dexGetSourceFile(
717    const DexFile* pDexFile, const DexClassDef* pClassDef)
718{
719    if (pClassDef->sourceFileIdx == 0xffffffff)
720        return NULL;
721    return dexStringById(pDexFile, pClassDef->sourceFileIdx);
722}
723
724/* get the size, in bytes, of a DexCode */
725size_t dexGetDexCodeSize(const DexCode* pCode);
726
727/* Get the list of "tries" for the given DexCode. */
728DEX_INLINE const DexTry* dexGetTries(const DexCode* pCode) {
729    const u2* insnsEnd = &pCode->insns[pCode->insnsSize];
730
731    // Round to four bytes.
732    if ((((u4) insnsEnd) & 3) != 0) {
733        insnsEnd++;
734    }
735
736    return (const DexTry*) insnsEnd;
737}
738
739/* Get the base of the encoded data for the given DexCode. */
740DEX_INLINE const u1* dexGetCatchHandlerData(const DexCode* pCode) {
741    const DexTry* pTries = dexGetTries(pCode);
742    return (const u1*) &pTries[pCode->triesSize];
743}
744
745/* get a pointer to the start of the debugging data */
746DEX_INLINE const u1* dexGetDebugInfoStream(const DexFile* pDexFile,
747    const DexCode* pCode)
748{
749    if (pCode->debugInfoOff == 0) {
750        return NULL;
751    } else {
752        return pDexFile->baseAddr + pCode->debugInfoOff;
753    }
754}
755
756/*
757 * Callback for "new position table entry".
758 * Returning non-0 causes the decoder to stop early.
759 */
760typedef int (*DexDebugNewPositionCb)(void *cnxt, u4 address, u4 lineNum);
761
762/*
763 * Callback for "new locals table entry". "signature" is an empty string
764 * if no signature is available for an entry.
765 */
766typedef void (*DexDebugNewLocalCb)(void *cnxt, u2 reg, u4 startAddress,
767        u4 endAddress, const char *name, const char *descriptor,
768        const char *signature);
769
770/*
771 * Decode debug info for method.
772 *
773 * posCb is called in ascending address order.
774 * localCb is called in order of ascending end address.
775 */
776void dexDecodeDebugInfo(
777            const DexFile* pDexFile,
778            const DexCode* pDexCode,
779            const char* classDescriptor,
780            u4 protoIdx,
781            u4 accessFlags,
782            DexDebugNewPositionCb posCb, DexDebugNewLocalCb localCb,
783            void* cnxt);
784
785/* DexClassDef convenience - get class descriptor */
786DEX_INLINE const char* dexGetClassDescriptor(const DexFile* pDexFile,
787    const DexClassDef* pClassDef)
788{
789    return dexStringByTypeIdx(pDexFile, pClassDef->classIdx);
790}
791
792/* DexClassDef convenience - get superclass descriptor */
793DEX_INLINE const char* dexGetSuperClassDescriptor(const DexFile* pDexFile,
794    const DexClassDef* pClassDef)
795{
796    if (pClassDef->superclassIdx == 0)
797        return NULL;
798    return dexStringByTypeIdx(pDexFile, pClassDef->superclassIdx);
799}
800
801/* DexClassDef convenience - get class_data_item pointer */
802DEX_INLINE const u1* dexGetClassData(const DexFile* pDexFile,
803    const DexClassDef* pClassDef)
804{
805    if (pClassDef->classDataOff == 0)
806        return NULL;
807    return (const u1*) (pDexFile->baseAddr + pClassDef->classDataOff);
808}
809
810/* Get an annotation set at a particular offset. */
811DEX_INLINE const DexAnnotationSetItem* dexGetAnnotationSetItem(
812    const DexFile* pDexFile, u4 offset)
813{
814    return (const DexAnnotationSetItem*) (pDexFile->baseAddr + offset);
815}
816/* get the class' annotation set */
817DEX_INLINE const DexAnnotationSetItem* dexGetClassAnnotationSet(
818    const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
819{
820    if (pAnnoDir->classAnnotationsOff == 0)
821        return NULL;
822    return dexGetAnnotationSetItem(pDexFile, pAnnoDir->classAnnotationsOff);
823}
824
825/* get the class' field annotation list */
826DEX_INLINE const DexFieldAnnotationsItem* dexGetFieldAnnotations(
827    const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
828{
829    if (pAnnoDir->fieldsSize == 0)
830        return NULL;
831
832    // Skip past the header to the start of the field annotations.
833    return (const DexFieldAnnotationsItem*) &pAnnoDir[1];
834}
835
836/* get field annotation list size */
837DEX_INLINE int dexGetFieldAnnotationsSize(const DexFile* pDexFile,
838    const DexAnnotationsDirectoryItem* pAnnoDir)
839{
840    return pAnnoDir->fieldsSize;
841}
842
843/* return a pointer to the field's annotation set */
844DEX_INLINE const DexAnnotationSetItem* dexGetFieldAnnotationSetItem(
845    const DexFile* pDexFile, const DexFieldAnnotationsItem* pItem)
846{
847    return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
848}
849
850/* get the class' method annotation list */
851DEX_INLINE const DexMethodAnnotationsItem* dexGetMethodAnnotations(
852    const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
853{
854    if (pAnnoDir->methodsSize == 0)
855        return NULL;
856
857    /*
858     * Skip past the header and field annotations to the start of the
859     * method annotations.
860     */
861    const u1* addr = (const u1*) &pAnnoDir[1];
862    addr += pAnnoDir->fieldsSize * sizeof (DexFieldAnnotationsItem);
863    return (const DexMethodAnnotationsItem*) addr;
864}
865
866/* get method annotation list size */
867DEX_INLINE int dexGetMethodAnnotationsSize(const DexFile* pDexFile,
868    const DexAnnotationsDirectoryItem* pAnnoDir)
869{
870    return pAnnoDir->methodsSize;
871}
872
873/* return a pointer to the method's annotation set */
874DEX_INLINE const DexAnnotationSetItem* dexGetMethodAnnotationSetItem(
875    const DexFile* pDexFile, const DexMethodAnnotationsItem* pItem)
876{
877    return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
878}
879
880/* get the class' parameter annotation list */
881DEX_INLINE const DexParameterAnnotationsItem* dexGetParameterAnnotations(
882    const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
883{
884    if (pAnnoDir->parametersSize == 0)
885        return NULL;
886
887    /*
888     * Skip past the header, field annotations, and method annotations
889     * to the start of the parameter annotations.
890     */
891    const u1* addr = (const u1*) &pAnnoDir[1];
892    addr += pAnnoDir->fieldsSize * sizeof (DexFieldAnnotationsItem);
893    addr += pAnnoDir->methodsSize * sizeof (DexMethodAnnotationsItem);
894    return (const DexParameterAnnotationsItem*) addr;
895}
896
897/* get method annotation list size */
898DEX_INLINE int dexGetParameterAnnotationsSize(const DexFile* pDexFile,
899    const DexAnnotationsDirectoryItem* pAnnoDir)
900{
901    return pAnnoDir->parametersSize;
902}
903
904/* return the parameter annotation ref list */
905DEX_INLINE const DexAnnotationSetRefList* dexGetParameterAnnotationSetRefList(
906    const DexFile* pDexFile, const DexParameterAnnotationsItem* pItem)
907{
908    return (const DexAnnotationSetRefList*)
909        (pDexFile->baseAddr + pItem->annotationsOff);
910}
911
912/* get method annotation list size */
913DEX_INLINE int dexGetParameterAnnotationSetRefSize(const DexFile* pDexFile,
914    const DexParameterAnnotationsItem* pItem)
915{
916    if (pItem->annotationsOff == 0)
917        return 0;
918    return dexGetParameterAnnotationSetRefList(pDexFile, pItem)->size;
919}
920
921/* return the Nth entry from an annotation set ref list */
922DEX_INLINE const DexAnnotationSetRefItem* dexGetParameterAnnotationSetRef(
923    const DexAnnotationSetRefList* pList, u4 idx)
924{
925    assert(idx < pList->size);
926    return &pList->list[idx];
927}
928
929/* given a DexAnnotationSetRefItem, return the DexAnnotationSetItem */
930DEX_INLINE const DexAnnotationSetItem* dexGetSetRefItemItem(
931    const DexFile* pDexFile, const DexAnnotationSetRefItem* pItem)
932{
933    return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
934}
935
936/* return the Nth annotation offset from a DexAnnotationSetItem */
937DEX_INLINE u4 dexGetAnnotationOff(
938    const DexAnnotationSetItem* pAnnoSet, u4 idx)
939{
940    assert(idx < pAnnoSet->size);
941    return pAnnoSet->entries[idx];
942}
943
944/* return the Nth annotation item from a DexAnnotationSetItem */
945DEX_INLINE const DexAnnotationItem* dexGetAnnotationItem(
946    const DexFile* pDexFile, const DexAnnotationSetItem* pAnnoSet, u4 idx)
947{
948    return (const DexAnnotationItem*)
949        (pDexFile->baseAddr + dexGetAnnotationOff(pAnnoSet, idx));
950}
951
952
953/*
954 * ===========================================================================
955 *      Utility Functions
956 * ===========================================================================
957 */
958
959/*
960 * Retrieve the next UTF-16 character from a UTF-8 string.
961 *
962 * Advances "*pUtf8Ptr" to the start of the next character.
963 *
964 * WARNING: If a string is corrupted by dropping a '\0' in the middle
965 * of a 3-byte sequence, you can end up overrunning the buffer with
966 * reads (and possibly with the writes if the length was computed and
967 * cached before the damage). For performance reasons, this function
968 * assumes that the string being parsed is known to be valid (e.g., by
969 * already being verified). Most strings we process here are coming
970 * out of dex files or other internal translations, so the only real
971 * risk comes from the JNI NewStringUTF call.
972 */
973DEX_INLINE u2 dexGetUtf16FromUtf8(const char** pUtf8Ptr)
974{
975    unsigned int one, two, three;
976
977    one = *(*pUtf8Ptr)++;
978    if ((one & 0x80) != 0) {
979        /* two- or three-byte encoding */
980        two = *(*pUtf8Ptr)++;
981        if ((one & 0x20) != 0) {
982            /* three-byte encoding */
983            three = *(*pUtf8Ptr)++;
984            return ((one & 0x0f) << 12) |
985                   ((two & 0x3f) << 6) |
986                   (three & 0x3f);
987        } else {
988            /* two-byte encoding */
989            return ((one & 0x1f) << 6) |
990                   (two & 0x3f);
991        }
992    } else {
993        /* one-byte encoding */
994        return one;
995    }
996}
997
998/* Compare two '\0'-terminated modified UTF-8 strings, using Unicode
999 * code point values for comparison. This treats different encodings
1000 * for the same code point as equivalent, except that only a real '\0'
1001 * byte is considered the string terminator. The return value is as
1002 * for strcmp(). */
1003int dexUtf8Cmp(const char* s1, const char* s2);
1004
1005
1006/* for dexIsValidMemberNameUtf8(), a bit vector indicating valid low ascii */
1007extern u4 DEX_MEMBER_VALID_LOW_ASCII[4];
1008
1009/* Helper for dexIsValidMemberUtf8(); do not call directly. */
1010bool dexIsValidMemberNameUtf8_0(const char** pUtf8Ptr);
1011
1012/* Return whether the pointed-at modified-UTF-8 encoded character is
1013 * valid as part of a member name, updating the pointer to point past
1014 * the consumed character. This will consume two encoded UTF-16 code
1015 * points if the character is encoded as a surrogate pair. Also, if
1016 * this function returns false, then the given pointer may only have
1017 * been partially advanced. */
1018DEX_INLINE bool dexIsValidMemberNameUtf8(const char** pUtf8Ptr) {
1019    u1 c = (u1) **pUtf8Ptr;
1020    if (c <= 0x7f) {
1021        // It's low-ascii, so check the table.
1022        u4 wordIdx = c >> 5;
1023        u4 bitIdx = c & 0x1f;
1024        (*pUtf8Ptr)++;
1025        return (DEX_MEMBER_VALID_LOW_ASCII[wordIdx] & (1 << bitIdx)) != 0;
1026    }
1027
1028    /*
1029     * It's a multibyte encoded character. Call a non-inline function
1030     * for the heavy lifting.
1031     */
1032    return dexIsValidMemberNameUtf8_0(pUtf8Ptr);
1033}
1034
1035/* Return whether the given string is a valid field or method name. */
1036bool dexIsValidMemberName(const char* s);
1037
1038/* Return whether the given string is a valid type descriptor. */
1039bool dexIsValidTypeDescriptor(const char* s);
1040
1041/* Return whether the given string is a valid reference descriptor. This
1042 * is true if dexIsValidTypeDescriptor() returns true and the descriptor
1043 * is for a class or array and not a primitive type. */
1044bool dexIsReferenceDescriptor(const char* s);
1045
1046/* Return whether the given string is a valid class descriptor. This
1047 * is true if dexIsValidTypeDescriptor() returns true and the descriptor
1048 * is for a class and not an array or primitive type. */
1049bool dexIsClassDescriptor(const char* s);
1050
1051/* Return whether the given string is a valid field type descriptor. This
1052 * is true if dexIsValidTypeDescriptor() returns true and the descriptor
1053 * is for anything but "void". */
1054bool dexIsFieldDescriptor(const char* s);
1055
1056#endif /*_LIBDEX_DEXFILE*/
1057