Question

好的，我的NDK应用程序崩溃了这样的信息：

signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000
r0 00000000 r1 0009a830 r2 698a2efc r3 2a63f4da
r4 66db37ac r5 698a2efc r6 6b843b14 r7 66d89ed4
r8 6b6e0ff5 r9 6b746000 sl 697e0680 fp 401912ec
ip 00000003 sp 6b843a90 lr 66d9d7dd pc 6b69ac36 cpsr 000d0030
d0 4c555345525f4c53 d1 4e4f434552505f54
d2 5f534e4f49544944 d3 444554414c4f4956
d4 0000000000000000 d5 000000003f800000
d6 000084c03f800000 d7 3f8000003f800000
d8 0000000000000000 d9 0000000000000000
d10 0000000000000000 d11 0000000000000000
d12 0000000000000000 d13 0000000000000000
d14 0000000000000000 d15 0000000000000000
d16 00000a3dcc4f35c1 d17 ffff000000010000
d18 3ff8099d80000000 d19 0000000000000000
d20 3ff0000000000000 d21 0000000000000000
d22 c040000000000000 d23 0000000000000000
d24 3ff8099d80000000 d25 0000000000000000
d26 3ff0000000000000 d27 0000000000000000
d28 3ff8099d80000000 d29 c040000000000000
d30 0000000000000000 d31 0000000000000000
scr 20000010

backtrace:
#00 pc 000dec36 /mnt/asec/com.myapp/lib/myapp.so     (HWLayer::SoundManagerImpl::MyChannel::start(SLEngineItf_ const* const*, SLObjectItf_ const* const*, HWLayer::SndChannelData const&)+249)
#01 pc 000decb1 /mnt/asec/com.myapp/lib/myapp.so (HWLayer::SoundManagerImpl::startChannel(HWLayer::SndChannelData const&)+20)
#02 pc 000cb2f3 /mnt/asec/com.myapp/lib/myapp.so (ChannelController::start(GPSoundObjectImpl*, bool)+242)

我想如何在我的C ++代码中找到此崩溃。

+249或+20在上面的回溯中意味着什么？我想这是从例程开始到子程序调用的一些偏移。但它的衡量单位是什么？

ip 00000003如何帮助我？我想这是一个指令指针......还有什么？

我的C ++代码看起来像

void SoundManagerImpl::startChannel( const SndChannelData& data )
{
    int const nChannel = data.nChannel;
    dbgAssert(nChannel >= 0 && nChannel < m_maxNumChannels);
    m_channels[nChannel].start(m_engineEngine, m_outputMix, data);
}

void SoundManagerImpl::MyChannel::start(SLEngineItf engine, SLObjectItf outputMix, SndChannelData const &data)
{
    stop();

    dbgAssertEq(16, data.bps);
    m_numPlayedPages = 0;
    m_pBuffer1 = data.pBuffer1;
    m_pBuffer2 = data.pBuffer2;

    SLresult status;
    SLDataLocator_BufferQueue bufferQueue;
    SLDataFormat_PCM pcm;
    SLDataSource audioSource;
    audioSource.pFormat = &pcm;
    audioSource.pLocator = &bufferQueue;

    /* Setup the data source structure for the buffer queue */
    bufferQueue.locatorType = SL_DATALOCATOR_BUFFERQUEUE;
    bufferQueue.numBuffers = data.nTotalPages;
    /* Setup the format of the content in the buffer queue */
    pcm.formatType = SL_DATAFORMAT_PCM;
    pcm.numChannels = (m_pBuffer2 != 0) ? 2 : 1;
    pcm.samplesPerSec = /*SL_SAMPLINGRATE_44_1*/data.sampleRate * 1000;
    pcm.bitsPerSample = /*SL_PCMSAMPLEFORMAT_FIXED_16*/data.bps;
    pcm.containerSize = pcm.bitsPerSample;
    pcm.channelMask = 1 == pcm.numChannels ? SL_SPEAKER_FRONT_CENTER : (SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT);
    pcm.endianness = SL_BYTEORDER_LITTLEENDIAN;

    SLDataSink audioSink;
    SLDataLocator_OutputMix locator_outputmix;
    locator_outputmix.locatorType = SL_DATALOCATOR_OUTPUTMIX;
    locator_outputmix.outputMix = outputMix;
    audioSink.pLocator = &locator_outputmix;
    audioSink.pFormat = 0;

    static SLboolean const s_required[] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};
    static SLInterfaceID const s_iidArray[] = {SL_IID_BUFFERQUEUE, SL_IID_VOLUME};
    dbgCompileAssert(GP_PLAIN_ARRAY_LEN(s_required) == GP_PLAIN_ARRAY_LEN(s_iidArray));

    status = (*engine)->CreateAudioPlayer(engine, &m_player, &audioSource, &audioSink,
    GP_PLAIN_ARRAY_LEN(s_required), s_iidArray, s_required);
    dbgAssertEq(SL_RESULT_SUCCESS, status);

    // ... and so on
}

有人可以帮助我找到崩溃报告和这个C ++代码中那些神奇数字之间的关联吗？

Answer 1

您应该查看位于Android NDK目录根目录的ndk-stack。它将这样的崩溃报告转换为一些人类可读的崩溃堆栈。

只需将logcat导入其中并指定库的位置：

adb logcat | ndk-stack -sym /path/to/myapp.so

（假设您的路径中包含adb和ndk-stack，否则请使用完整路径）

希望这有帮助！

Answer 2

NDK工具链包含一个名为addr2line的工具。你可以解释

#00 pc 000dec36 /mnt/asec/com.myapp/lib/myapp.so     (HWLayer::SoundManagerImpl::MyChannel::start(SLEngineItf_ const* const*, SLObjectItf_ const* const*, HWLayer::SndChannelData const&)+249)

像这样（ for arm gcc toolchain ）：

~/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-addr2line -Cf -e obj/local/armeabi/myapp.so dec36

请注意，我提供了--executable目录中的obj，我有 .so 文件，其中包含额外的信息，安装到{{1}时会被删除}。

了解Android Native代码崩溃报告

2 个答案: