This file is indexed.

/usr/include/android/libdex/DexCatch.h is in android-libdex-dev 7.0.0+r33-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/*
 * 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.
 */

/*
 * Functions for dealing with try-catch info.
 */

#ifndef LIBDEX_DEXCATCH_H_
#define LIBDEX_DEXCATCH_H_

#include "DexFile.h"
#include "Leb128.h"

/*
 * Catch handler entry, used while iterating over catch_handler_items.
 */
struct DexCatchHandler {
    u4          typeIdx;    /* type index of the caught exception type */
    u4          address;    /* handler address */
};

/* Get the first handler offset for the given DexCode.
 * It's not 0 because the handlers list is prefixed with its size
 * (in entries) as a uleb128. */
u4 dexGetFirstHandlerOffset(const DexCode* pCode);

/* Get count of handler lists for the given DexCode. */
u4 dexGetHandlersSize(const DexCode* pCode);

/*
 * Iterator over catch handler data. This structure should be treated as
 * opaque.
 */
struct DexCatchIterator {
    const u1* pEncodedData;
    bool catchesAll;
    u4 countRemaining;
    DexCatchHandler handler;
};

/* Initialize a DexCatchIterator to emptiness. This mostly exists to
 * squelch innocuous warnings. */
DEX_INLINE void dexCatchIteratorClear(DexCatchIterator* pIterator) {
    pIterator->pEncodedData = NULL;
    pIterator->catchesAll = false;
    pIterator->countRemaining = 0;
    pIterator->handler.typeIdx = 0;
    pIterator->handler.address = 0;
}

/* Initialize a DexCatchIterator with a direct pointer to encoded handlers. */
DEX_INLINE void dexCatchIteratorInitToPointer(DexCatchIterator* pIterator,
    const u1* pEncodedData)
{
    s4 count = readSignedLeb128(&pEncodedData);

    if (count <= 0) {
        pIterator->catchesAll = true;
        count = -count;
    } else {
        pIterator->catchesAll = false;
    }

    pIterator->pEncodedData = pEncodedData;
    pIterator->countRemaining = count;
}

/* Initialize a DexCatchIterator to a particular handler offset. */
DEX_INLINE void dexCatchIteratorInit(DexCatchIterator* pIterator,
    const DexCode* pCode, u4 offset)
{
    dexCatchIteratorInitToPointer(pIterator,
            dexGetCatchHandlerData(pCode) + offset);
}

/* Get the next item from a DexCatchIterator. Returns NULL if at end. */
DEX_INLINE DexCatchHandler* dexCatchIteratorNext(DexCatchIterator* pIterator) {
    if (pIterator->countRemaining == 0) {
        if (! pIterator->catchesAll) {
            return NULL;
        }

        pIterator->catchesAll = false;
        pIterator->handler.typeIdx = kDexNoIndex;
    } else {
        u4 typeIdx = readUnsignedLeb128(&pIterator->pEncodedData);
        pIterator->handler.typeIdx = typeIdx;
        pIterator->countRemaining--;
    }

    pIterator->handler.address = readUnsignedLeb128(&pIterator->pEncodedData);
    return &pIterator->handler;
}

/* Get the handler offset just past the end of the one just iterated over.
 * This ends the iteration if it wasn't already. */
u4 dexCatchIteratorGetEndOffset(DexCatchIterator* pIterator,
    const DexCode* pCode);

/* Helper for dexFindCatchHandler(). Do not call directly. */
int dexFindCatchHandlerOffset0(u2 triesSize, const DexTry* pTries,
        u4 address);

/* Find the handler associated with a given address, if any.
 * Initializes the given iterator and returns true if a match is
 * found. Returns false if there is no applicable handler. */
DEX_INLINE bool dexFindCatchHandler(DexCatchIterator *pIterator,
        const DexCode* pCode, u4 address) {
    u2 triesSize = pCode->triesSize;
    int offset = -1;

    // Short-circuit the overwhelmingly common cases.
    switch (triesSize) {
        case 0: {
            break;
        }
        case 1: {
            const DexTry* tries = dexGetTries(pCode);
            u4 start = tries[0].startAddr;

            if (address < start) {
                break;
            }

            u4 end = start + tries[0].insnCount;

            if (address >= end) {
                break;
            }

            offset = tries[0].handlerOff;
            break;
        }
        default: {
            offset = dexFindCatchHandlerOffset0(triesSize, dexGetTries(pCode),
                    address);
        }
    }

    if (offset < 0) {
        dexCatchIteratorClear(pIterator); // This squelches warnings.
        return false;
    } else {
        dexCatchIteratorInit(pIterator, pCode, offset);
        return true;
    }
}

#endif  // LIBDEX_DEXCATCH_H_