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DexDump.cpp
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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* The "dexdump" tool is intended to mimic "objdump". When possible, use
* similar command-line arguments.
*
* TODO: rework the "plain" output format to be more regexp-friendly
*
* Differences between XML output and the "current.xml" file:
* - classes in same package are not all grouped together; generally speaking
* nothing is sorted
* - no "deprecated" on fields and methods
* - no "value" on fields
* - no parameter names
* - no generic signatures on parameters, e.g. type="java.lang.Class<?>"
* - class shows declared fields and methods; does not show inherited fields
*/
#include "libdex/DexFile.h"
#include "libdex/CmdUtils.h"
#include "libdex/DexCatch.h"
#include "libdex/DexClass.h"
#include "libdex/DexDebugInfo.h"
#include "libdex/DexOpcodes.h"
#include "libdex/DexProto.h"
#include "libdex/InstrUtils.h"
#include "libdex/SysUtil.h"
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <assert.h>
#include <inttypes.h>
#include <fstream>
#include <iostream>
#include <streambuf>
#include <unordered_map>
#include <unordered_set>
#include <string>
#include <utility>
#include <vector>
#include <set>
#include <bitset>
#include <fstream>
struct INST {
int flag;
int t1;
int t2;
enum Opcode opcode;
INST() {
flag = 0;
t1 = 0;
t2 = 0;
}
};
std::unordered_map<std::string, std::string> html_conv = {{""", "\""}, {"&", "&"}, {"<", "<"}, {">", ">"}, {"'", "'"}};
static std::string formatInstr(int insnIdx, const DecodedInstruction* pDecInsn, char *indexBuf);
bool isIfTestZ(enum Opcode op) {
return op >= OP_IF_EQZ && op <= OP_IF_LEZ;
}
bool isIfTest(enum Opcode op) {
return op >= OP_IF_EQ && op <= OP_IF_LE;
}
bool isSwitch(enum Opcode op) {
return op == OP_PACKED_SWITCH || op == OP_SPARSE_SWITCH;
}
bool isReturn(enum Opcode op) {
return op >= OP_RETURN_VOID && op <= OP_RETURN_OBJECT;
}
bool isUnconditionalBranch(enum Opcode op) {
return op == OP_GOTO || op == OP_GOTO_16 || op == OP_GOTO_32;
}
bool isConditionalBranch(enum Opcode op) {
return (op >= OP_IF_EQ && op <= OP_IF_LEZ) || isSwitch(op);
}
bool isBranch(enum Opcode op) {
return isUnconditionalBranch(op) || isConditionalBranch(op);
}
bool isNoFallThrowInstruction(enum Opcode op) {
return op == OP_THROW || isReturn(op) || isUnconditionalBranch(op);
}
bool isThrow(enum Opcode op) {
return op == OP_THROW;
}
std::string clean_string(std::string s) {
std::string r;
char tmp[100];
int extra = 0;
int i = 0;
while(i < (int)s.size() && r.size()+extra < 255) {
if(isascii(s[i])) {
switch(s[i]) {
case 0x9:
r.push_back(' ');
break;
case 0xd:
r.push_back(' ');
break;
case 0xa:
extra++;
break;
default:
if(s[i] >= 1 && s[i] <= 0xf) {
sprintf(tmp, "_x %x_;", (unsigned char)s[i]);
r.append(std::string(tmp));
} else if(s[i] <= 0x1f){
sprintf(tmp, "_x%x_;", (unsigned char)s[i]);
r.append(std::string(tmp));
} else {
switch(s[i]) {
case '&':
unsigned long end = s.find(';', i);
if(end != std::string::npos) {
std::string t = s.substr(i, end-i+1);
if(html_conv.count(t)) {
r.append(html_conv[t]);
i += t.size();
continue;
}
}
}
r.push_back(s[i]);
}
}
} else {
sprintf(tmp, "_x%x_;", (unsigned char)s[i]);
r.append(std::string(tmp));
}
i++;
}
return r.substr(0, 255-extra);
}
static const char* gProgName = "dexdump";
enum OutputFormat {
OUTPUT_PLAIN = 0, /* default */
OUTPUT_XML, /* fancy */
};
/* command-line options */
struct Options {
bool checksumOnly;
bool disassemble;
bool showFileHeaders;
bool showSectionHeaders;
bool ignoreBadChecksum;
bool dumpRegisterMaps;
bool dumpInstruction;
OutputFormat outputFormat;
const char* tempFileName;
bool exportsOnly;
bool verbose;
};
struct Options gOptions;
/* basic info about a field or method */
struct FieldMethodInfo {
const char* classDescriptor;
const char* name;
const char* signature;
};
/*
* Get 2 little-endian bytes.
*/
static inline u2 get2LE(unsigned char const* pSrc)
{
return pSrc[0] | (pSrc[1] << 8);
}
/*
* Get 4 little-endian bytes.
*/
static inline u4 get4LE(unsigned char const* pSrc)
{
return pSrc[0] | (pSrc[1] << 8) | (pSrc[2] << 16) | (pSrc[3] << 24);
}
/*
* Converts a single-character primitive type into its human-readable
* equivalent.
*/
static const char* primitiveTypeLabel(char typeChar)
{
switch (typeChar) {
case 'B': return "byte";
case 'C': return "char";
case 'D': return "double";
case 'F': return "float";
case 'I': return "int";
case 'J': return "long";
case 'S': return "short";
case 'V': return "void";
case 'Z': return "boolean";
default:
return "UNKNOWN";
}
}
/*
* Converts a type descriptor to human-readable "dotted" form. For
* example, "Ljava/lang/String;" becomes "java.lang.String", and
* "[I" becomes "int[]". Also converts '$' to '.', which means this
* form can't be converted back to a descriptor.
*/
static char* descriptorToDot(const char* str)
{
int targetLen = strlen(str);
int offset = 0;
int arrayDepth = 0;
char* newStr;
/* strip leading [s; will be added to end */
while (targetLen > 1 && str[offset] == '[') {
offset++;
targetLen--;
}
arrayDepth = offset;
if (targetLen == 1) {
/* primitive type */
str = primitiveTypeLabel(str[offset]);
offset = 0;
targetLen = strlen(str);
} else {
/* account for leading 'L' and trailing ';' */
if (targetLen >= 2 && str[offset] == 'L' &&
str[offset+targetLen-1] == ';')
{
targetLen -= 2;
offset++;
}
}
newStr = (char*)malloc(targetLen + arrayDepth * 2 +1);
/* copy class name over */
int i;
for (i = 0; i < targetLen; i++) {
char ch = str[offset + i];
newStr[i] = (ch == '/' || ch == '$') ? '.' : ch;
}
/* add the appropriate number of brackets for arrays */
while (arrayDepth-- > 0) {
newStr[i++] = '[';
newStr[i++] = ']';
}
newStr[i] = '\0';
assert(i == targetLen + arrayDepth * 2);
return newStr;
}
/*
* Converts the class name portion of a type descriptor to human-readable
* "dotted" form.
*
* Returns a newly-allocated string.
*/
static char* descriptorClassToDot(const char* str)
{
const char* lastSlash;
char* newStr;
char* cp;
/* reduce to just the class name, trimming trailing ';' */
lastSlash = strrchr(str, '/');
if (lastSlash == NULL)
lastSlash = str + 1; /* start past 'L' */
else
lastSlash++; /* start past '/' */
newStr = strdup(lastSlash);
newStr[strlen(lastSlash)-1] = '\0';
for (cp = newStr; *cp != '\0'; cp++) {
if (*cp == '$')
*cp = '.';
}
return newStr;
}
/*
* Returns a quoted string representing the boolean value.
*/
static const char* quotedBool(bool val)
{
if (val)
return "\"true\"";
else
return "\"false\"";
}
static const char* quotedVisibility(u4 accessFlags)
{
if ((accessFlags & ACC_PUBLIC) != 0)
return "\"public\"";
else if ((accessFlags & ACC_PROTECTED) != 0)
return "\"protected\"";
else if ((accessFlags & ACC_PRIVATE) != 0)
return "\"private\"";
else
return "\"package\"";
}
/*
* Count the number of '1' bits in a word.
*/
static int countOnes(u4 val)
{
int count = 0;
val = val - ((val >> 1) & 0x55555555);
val = (val & 0x33333333) + ((val >> 2) & 0x33333333);
count = (((val + (val >> 4)) & 0x0F0F0F0F) * 0x01010101) >> 24;
return count;
}
/*
* Flag for use with createAccessFlagStr().
*/
enum AccessFor {
kAccessForClass = 0, kAccessForMethod = 1, kAccessForField = 2,
kAccessForMAX
};
/*
* Create a new string with human-readable access flags.
*
* In the base language the access_flags fields are type u2; in Dalvik
* they're u4.
*/
static char* createAccessFlagStr(u4 flags, AccessFor forWhat)
{
#define NUM_FLAGS 18
static const char* kAccessStrings[kAccessForMAX][NUM_FLAGS] = {
{
/* class, inner class */
"PUBLIC", /* 0x0001 */
"PRIVATE", /* 0x0002 */
"PROTECTED", /* 0x0004 */
"STATIC", /* 0x0008 */
"FINAL", /* 0x0010 */
"?", /* 0x0020 */
"?", /* 0x0040 */
"?", /* 0x0080 */
"?", /* 0x0100 */
"INTERFACE", /* 0x0200 */
"ABSTRACT", /* 0x0400 */
"?", /* 0x0800 */
"SYNTHETIC", /* 0x1000 */
"ANNOTATION", /* 0x2000 */
"ENUM", /* 0x4000 */
"?", /* 0x8000 */
"VERIFIED", /* 0x10000 */
"OPTIMIZED", /* 0x20000 */
},
{
/* method */
"PUBLIC", /* 0x0001 */
"PRIVATE", /* 0x0002 */
"PROTECTED", /* 0x0004 */
"STATIC", /* 0x0008 */
"FINAL", /* 0x0010 */
"SYNCHRONIZED", /* 0x0020 */
"BRIDGE", /* 0x0040 */
"VARARGS", /* 0x0080 */
"NATIVE", /* 0x0100 */
"?", /* 0x0200 */
"ABSTRACT", /* 0x0400 */
"STRICT", /* 0x0800 */
"SYNTHETIC", /* 0x1000 */
"?", /* 0x2000 */
"?", /* 0x4000 */
"MIRANDA", /* 0x8000 */
"CONSTRUCTOR", /* 0x10000 */
"DECLARED_SYNCHRONIZED", /* 0x20000 */
},
{
/* field */
"PUBLIC", /* 0x0001 */
"PRIVATE", /* 0x0002 */
"PROTECTED", /* 0x0004 */
"STATIC", /* 0x0008 */
"FINAL", /* 0x0010 */
"?", /* 0x0020 */
"VOLATILE", /* 0x0040 */
"TRANSIENT", /* 0x0080 */
"?", /* 0x0100 */
"?", /* 0x0200 */
"?", /* 0x0400 */
"?", /* 0x0800 */
"SYNTHETIC", /* 0x1000 */
"?", /* 0x2000 */
"ENUM", /* 0x4000 */
"?", /* 0x8000 */
"?", /* 0x10000 */
"?", /* 0x20000 */
},
};
const int kLongest = 21; /* strlen of longest string above */
int i, count;
char* str;
char* cp;
/*
* Allocate enough storage to hold the expected number of strings,
* plus a space between each. We over-allocate, using the longest
* string above as the base metric.
*/
count = countOnes(flags);
cp = str = (char*) malloc(count * (kLongest+1) +1);
for (i = 0; i < NUM_FLAGS; i++) {
if (flags & 0x01) {
const char* accessStr = kAccessStrings[forWhat][i];
int len = strlen(accessStr);
if (cp != str)
*cp++ = ' ';
memcpy(cp, accessStr, len);
cp += len;
}
flags >>= 1;
}
*cp = '\0';
return str;
}
/*
* Copy character data from "data" to "out", converting non-ASCII values
* to printf format chars or an ASCII filler ('.' or '?').
*
* The output buffer must be able to hold (2*len)+1 bytes. The result is
* NUL-terminated.
*/
static void asciify(char* out, const unsigned char* data, size_t len)
{
while (len--) {
if (*data < 0x20) {
/* could do more here, but we don't need them yet */
switch (*data) {
case '\0':
*out++ = '\\';
*out++ = '0';
break;
case '\n':
*out++ = '\\';
*out++ = 'n';
break;
default:
*out++ = '.';
break;
}
} else if (*data >= 0x80) {
*out++ = '?';
} else {
*out++ = *data;
}
data++;
}
*out = '\0';
}
/*
* Dump the file header.
*/
void dumpFileHeader(const DexFile* pDexFile)
{
const DexOptHeader* pOptHeader = pDexFile->pOptHeader;
const DexHeader* pHeader = pDexFile->pHeader;
char sanitized[sizeof(pHeader->magic)*2 +1];
assert(sizeof(pHeader->magic) == sizeof(pOptHeader->magic));
if (pOptHeader != NULL) {
printf("Optimized DEX file header:\n");
asciify(sanitized, pOptHeader->magic, sizeof(pOptHeader->magic));
printf("magic : '%s'\n", sanitized);
printf("dex_offset : %d (0x%06x)\n",
pOptHeader->dexOffset, pOptHeader->dexOffset);
printf("dex_length : %d\n", pOptHeader->dexLength);
printf("deps_offset : %d (0x%06x)\n",
pOptHeader->depsOffset, pOptHeader->depsOffset);
printf("deps_length : %d\n", pOptHeader->depsLength);
printf("opt_offset : %d (0x%06x)\n",
pOptHeader->optOffset, pOptHeader->optOffset);
printf("opt_length : %d\n", pOptHeader->optLength);
printf("flags : %08x\n", pOptHeader->flags);
printf("checksum : %08x\n", pOptHeader->checksum);
printf("\n");
}
printf("DEX file header:\n");
asciify(sanitized, pHeader->magic, sizeof(pHeader->magic));
printf("magic : '%s'\n", sanitized);
printf("checksum : %08x\n", pHeader->checksum);
printf("signature : %02x%02x...%02x%02x\n",
pHeader->signature[0], pHeader->signature[1],
pHeader->signature[kSHA1DigestLen-2],
pHeader->signature[kSHA1DigestLen-1]);
printf("file_size : %d\n", pHeader->fileSize);
printf("header_size : %d\n", pHeader->headerSize);
printf("link_size : %d\n", pHeader->linkSize);
printf("link_off : %d (0x%06x)\n",
pHeader->linkOff, pHeader->linkOff);
printf("string_ids_size : %d\n", pHeader->stringIdsSize);
printf("string_ids_off : %d (0x%06x)\n",
pHeader->stringIdsOff, pHeader->stringIdsOff);
printf("type_ids_size : %d\n", pHeader->typeIdsSize);
printf("type_ids_off : %d (0x%06x)\n",
pHeader->typeIdsOff, pHeader->typeIdsOff);
printf("proto_ids_size : %d\n", pHeader->protoIdsSize);
printf("proto_ids_off : %d (0x%06x)\n",
pHeader->protoIdsOff, pHeader->protoIdsOff);
printf("field_ids_size : %d\n", pHeader->fieldIdsSize);
printf("field_ids_off : %d (0x%06x)\n",
pHeader->fieldIdsOff, pHeader->fieldIdsOff);
printf("method_ids_size : %d\n", pHeader->methodIdsSize);
printf("method_ids_off : %d (0x%06x)\n",
pHeader->methodIdsOff, pHeader->methodIdsOff);
printf("class_defs_size : %d\n", pHeader->classDefsSize);
printf("class_defs_off : %d (0x%06x)\n",
pHeader->classDefsOff, pHeader->classDefsOff);
printf("data_size : %d\n", pHeader->dataSize);
printf("data_off : %d (0x%06x)\n",
pHeader->dataOff, pHeader->dataOff);
printf("\n");
}
/*
* Dump the "table of contents" for the opt area.
*/
void dumpOptDirectory(const DexFile* pDexFile)
{
const DexOptHeader* pOptHeader = pDexFile->pOptHeader;
if (pOptHeader == NULL)
return;
printf("OPT section contents:\n");
const u4* pOpt = (const u4*) ((u1*) pOptHeader + pOptHeader->optOffset);
if (*pOpt == 0) {
printf("(1.0 format, only class lookup table is present)\n\n");
return;
}
/*
* The "opt" section is in "chunk" format: a 32-bit identifier, a 32-bit
* length, then the data. Chunks start on 64-bit boundaries.
*/
while (*pOpt != kDexChunkEnd) {
const char* verboseStr;
u4 size = *(pOpt+1);
switch (*pOpt) {
case kDexChunkClassLookup:
verboseStr = "class lookup hash table";
break;
case kDexChunkRegisterMaps:
verboseStr = "register maps";
break;
default:
verboseStr = "(unknown chunk type)";
break;
}
printf("Chunk %08x (%c%c%c%c) - %s (%d bytes)\n", *pOpt,
*pOpt >> 24, (char)(*pOpt >> 16), (char)(*pOpt >> 8), (char)*pOpt,
verboseStr, size);
size = (size + 8 + 7) & ~7;
pOpt += size / sizeof(u4);
}
printf("\n");
}
/*
* Dump a class_def_item.
*/
void dumpClassDef(DexFile* pDexFile, int idx)
{
const DexClassDef* pClassDef;
const u1* pEncodedData;
DexClassData* pClassData;
pClassDef = dexGetClassDef(pDexFile, idx);
pEncodedData = dexGetClassData(pDexFile, pClassDef);
pClassData = dexReadAndVerifyClassData(&pEncodedData, NULL);
if (pClassData == NULL) {
fprintf(stderr, "Trouble reading class data\n");
return;
}
printf("Class #%d header:\n", idx);
printf("class_idx : %d\n", pClassDef->classIdx);
printf("access_flags : %d (0x%04x)\n",
pClassDef->accessFlags, pClassDef->accessFlags);
printf("superclass_idx : %d\n", pClassDef->superclassIdx);
printf("interfaces_off : %d (0x%06x)\n",
pClassDef->interfacesOff, pClassDef->interfacesOff);
printf("source_file_idx : %d\n", pClassDef->sourceFileIdx);
printf("annotations_off : %d (0x%06x)\n",
pClassDef->annotationsOff, pClassDef->annotationsOff);
printf("class_data_off : %d (0x%06x)\n",
pClassDef->classDataOff, pClassDef->classDataOff);
printf("static_fields_size : %d\n", pClassData->header.staticFieldsSize);
printf("instance_fields_size: %d\n",
pClassData->header.instanceFieldsSize);
printf("direct_methods_size : %d\n", pClassData->header.directMethodsSize);
printf("virtual_methods_size: %d\n",
pClassData->header.virtualMethodsSize);
printf("\n");
free(pClassData);
}
/*
* Dump an interface that a class declares to implement.
*/
void dumpInterface(const DexFile* pDexFile, const DexTypeItem* pTypeItem,
int i)
{
const char* interfaceName =
dexStringByTypeIdx(pDexFile, pTypeItem->typeIdx);
if (gOptions.outputFormat == OUTPUT_PLAIN) {
printf(" #%d : '%s'\n", i, interfaceName);
} else {
char* dotted = descriptorToDot(interfaceName);
printf("<implements name=\"%s\">\n</implements>\n", dotted);
free(dotted);
}
}
/*
* Dump the catches table associated with the code.
*/
void dumpCatches(DexFile* pDexFile, const DexCode* pCode)
{
u4 triesSize = pCode->triesSize;
if (triesSize == 0) {
printf(" catches : (none)\n");
return;
}
printf(" catches : %d\n", triesSize);
const DexTry* pTries = dexGetTries(pCode);
u4 i;
for (i = 0; i < triesSize; i++) {
const DexTry* pTry = &pTries[i];
u4 start = pTry->startAddr;
u4 end = start + pTry->insnCount;
DexCatchIterator iterator;
printf(" 0x%04x - 0x%04x\n", start, end);
dexCatchIteratorInit(&iterator, pCode, pTry->handlerOff);
for (;;) {
DexCatchHandler* handler = dexCatchIteratorNext(&iterator);
const char* descriptor;
if (handler == NULL) {
break;
}
descriptor = (handler->typeIdx == kDexNoIndex) ? "<any>" :
dexStringByTypeIdx(pDexFile, handler->typeIdx);
printf(" %s -> 0x%04x\n", descriptor,
handler->address);
}
}
}
void dumpCatches2(DexFile* pDexFile, const DexCode* pCode,
std::vector<std::pair<std::string, struct INST>> &code_cache,
std::unordered_map<int, int> &code_map,
std::unordered_set<int> &start_targets)
{
u4 triesSize = pCode->triesSize;
if (triesSize == 0) {
return;
}
const DexTry* pTries = dexGetTries(pCode);
u4 i;
//std::set<std::pair<int,int>> try_blocks;
for (i = 0; i < triesSize; i++) {
const DexTry* pTry = &pTries[i];
u4 start = pTry->startAddr;
u4 end = start + pTry->insnCount;
DexCatchIterator iterator;
start_targets.insert(start);
int index = code_map[end];
if(index > 0 && isThrow(code_cache[index-1].second.opcode) == false) {
start_targets.insert(end);
}
dexCatchIteratorInit(&iterator, pCode, pTry->handlerOff);
for (;;) {
DexCatchHandler* handler = dexCatchIteratorNext(&iterator);
const char* descriptor;
if (handler == NULL) {
break;
}
descriptor = (handler->typeIdx == kDexNoIndex) ? "<any>" :
dexStringByTypeIdx(pDexFile, handler->typeIdx);
start_targets.insert(handler->address);
}
}
}
static int dumpPositionsCb(void * /* cnxt */, u4 address, u4 lineNum)
{
printf(" 0x%04x line=%d\n", address, lineNum);
return 0;
}
/*
* Dump the positions list.
*/
void dumpPositions(DexFile* pDexFile, const DexCode* pCode,
const DexMethod *pDexMethod)
{
printf(" positions : \n");
const DexMethodId *pMethodId
= dexGetMethodId(pDexFile, pDexMethod->methodIdx);
const char *classDescriptor
= dexStringByTypeIdx(pDexFile, pMethodId->classIdx);
dexDecodeDebugInfo(pDexFile, pCode, classDescriptor, pMethodId->protoIdx,
pDexMethod->accessFlags, dumpPositionsCb, NULL, NULL);
}
static void dumpLocalsCb(void * /* cnxt */, u2 reg, u4 startAddress,
u4 endAddress, const char *name, const char *descriptor,
const char *signature)
{
printf(" 0x%04x - 0x%04x reg=%d %s %s %s\n",
startAddress, endAddress, reg, name, descriptor,
signature);
}
/*
* Dump the locals list.
*/
void dumpLocals(DexFile* pDexFile, const DexCode* pCode,
const DexMethod *pDexMethod)
{
printf(" locals : \n");
const DexMethodId *pMethodId
= dexGetMethodId(pDexFile, pDexMethod->methodIdx);
const char *classDescriptor
= dexStringByTypeIdx(pDexFile, pMethodId->classIdx);
dexDecodeDebugInfo(pDexFile, pCode, classDescriptor, pMethodId->protoIdx,
pDexMethod->accessFlags, NULL, dumpLocalsCb, NULL);
}
/*
* Get information about a method.
*/
bool getMethodInfo(DexFile* pDexFile, u4 methodIdx, FieldMethodInfo* pMethInfo)
{
const DexMethodId* pMethodId;
if (methodIdx >= pDexFile->pHeader->methodIdsSize)
return false;
pMethodId = dexGetMethodId(pDexFile, methodIdx);
pMethInfo->name = dexStringById(pDexFile, pMethodId->nameIdx);
pMethInfo->signature = dexCopyDescriptorFromMethodId(pDexFile, pMethodId);
pMethInfo->classDescriptor =
dexStringByTypeIdx(pDexFile, pMethodId->classIdx);
return true;
}
/*
* Get information about a field.
*/
bool getFieldInfo(DexFile* pDexFile, u4 fieldIdx, FieldMethodInfo* pFieldInfo)
{
const DexFieldId* pFieldId;
if (fieldIdx >= pDexFile->pHeader->fieldIdsSize)
return false;
pFieldId = dexGetFieldId(pDexFile, fieldIdx);
pFieldInfo->name = dexStringById(pDexFile, pFieldId->nameIdx);
pFieldInfo->signature = dexStringByTypeIdx(pDexFile, pFieldId->typeIdx);
pFieldInfo->classDescriptor =
dexStringByTypeIdx(pDexFile, pFieldId->classIdx);
return true;
}
/*
* Look up a class' descriptor.
*/
const char* getClassDescriptor(DexFile* pDexFile, u4 classIdx)
{
return dexStringByTypeIdx(pDexFile, classIdx);
}
/*
* Helper for dumpInstruction(), which builds the string
* representation for the index in the given instruction. This will
* first try to use the given buffer, but if the result won't fit,
* then this will allocate a new buffer to hold the result. A pointer
* to the buffer which holds the full result is always returned, and
* this can be compared with the one passed in, to see if the result
* needs to be free()d.
*/
static char* indexString(DexFile* pDexFile,
const DecodedInstruction* pDecInsn, char* buf, size_t bufSize)
{
int outSize;
u4 index;
u4 width;
/* TODO: Make the index *always* be in field B, to simplify this code. */
switch (dexGetFormatFromOpcode(pDecInsn->opcode)) {
case kFmt20bc:
case kFmt21c:
case kFmt35c:
case kFmt35ms:
case kFmt3rc:
case kFmt3rms:
case kFmt35mi:
case kFmt3rmi:
index = pDecInsn->vB;
width = 4;
break;
case kFmt31c:
index = pDecInsn->vB;
width = 8;
break;
case kFmt22c:
case kFmt22cs:
index = pDecInsn->vC;
width = 4;
break;
default:
index = 0;
width = 4;
break;
}
switch (pDecInsn->indexType) {
case kIndexUnknown:
/*
* This function shouldn't ever get called for this type, but do
* something sensible here, just to help with debugging.
*/
outSize = snprintf(buf, bufSize, "<unknown-index>");
break;
case kIndexNone:
/*
* This function shouldn't ever get called for this type, but do
* something sensible here, just to help with debugging.
*/
outSize = snprintf(buf, bufSize, "<no-index>");
break;
case kIndexVaries:
/*
* This one should never show up in a dexdump, so no need to try
* to get fancy here.
*/
outSize = snprintf(buf, bufSize, "<index-varies> // thing@%0*x",
width, index);
break;
case kIndexTypeRef:
if (index < pDexFile->pHeader->typeIdsSize) {
outSize = snprintf(buf, bufSize, "%s // type@%0*x",
getClassDescriptor(pDexFile, index), width, index);
} else {
outSize = snprintf(buf, bufSize, "<type?> // type@%0*x", width, index);
}
break;
case kIndexStringRef:
if (index < pDexFile->pHeader->stringIdsSize) {
outSize = snprintf(buf, bufSize, "\"%s\" // string@%0*x",
dexStringById(pDexFile, index), width, index);
} else {
outSize = snprintf(buf, bufSize, "<string?> // string@%0*x",
width, index);
}
break;
case kIndexMethodRef:
{
FieldMethodInfo methInfo;
if (getMethodInfo(pDexFile, index, &methInfo)) {
outSize = snprintf(buf, bufSize, "%s.%s:%s // method@%0*x",
methInfo.classDescriptor, methInfo.name,
methInfo.signature, width, index);
free((void *) methInfo.signature);
} else {
outSize = snprintf(buf, bufSize, "<method?> // method@%0*x",
width, index);
}
}
break;
case kIndexFieldRef:
{
FieldMethodInfo fieldInfo;
if (getFieldInfo(pDexFile, index, &fieldInfo)) {
outSize = snprintf(buf, bufSize, "%s.%s:%s // field@%0*x",
fieldInfo.classDescriptor, fieldInfo.name,
fieldInfo.signature, width, index);
} else {
outSize = snprintf(buf, bufSize, "<field?> // field@%0*x",
width, index);
}
}
break;
case kIndexInlineMethod:
outSize = snprintf(buf, bufSize, "[%0*x] // inline #%0*x",
width, index, width, index);
break;
case kIndexVtableOffset:
outSize = snprintf(buf, bufSize, "[%0*x] // vtable #%0*x",
width, index, width, index);
break;
case kIndexFieldOffset:
outSize = snprintf(buf, bufSize, "[obj+%0*x]", width, index);
break;
default:
outSize = snprintf(buf, bufSize, "<?>");
break;
}
if (outSize >= (int) bufSize) {
/*
* The buffer wasn't big enough; allocate and retry. Note:
* snprintf() doesn't count the '\0' as part of its returned
* size, so we add explicit space for it here.
*/
outSize++;