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POC++ Index variable changing radically in Debug Version
 

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  1. POC++ Index variable changing radically in Debug Version
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    <p>I have found a lot of answers that have to do with release version problems but none with the exact opposite. </p> <p>I have a loop similar to the following:</p> <pre><code>while(index &lt; 7 &amp;&amp; FlagIsUp) { // process Inner Loop Inner Inner Loop Array[index] = number; ++index; } </code></pre> <p>Problem is that index changes radically from 6 (the last iteration) to 17209 for an int16_t and 1133165442 for size_t. NOTHING IN THE LOOP changes the index except the ++index. I replaced the while with a for and it still happens.</p> <p>It only happens in debug mode, in release version it does finish without issues.</p> <p>I also added volatile to the index and results were the same, it still overflowed.</p> <p>Any ideas, pointers, would be appreciated. I can't provide a working copy of the bug so any theories are welcomed, I want to exhaust my options to find the problem.</p> <p>EDIT: Yes I'm sorry. I gave to little information. First off I'm working with QNX Momentics Version: 4.6.0 and my debugger is part of the GNU Compiler Collection 4.3.3.</p> <p>Now the inner loop is this:</p> <pre><code>cSignalNoIndex = 0; while ((cSignalNoIndex &lt; (2 * NO_PHASES + 1)) &amp;&amp; !ShutDownFlag) { wSF0 = 0; wExtSF = 0; dwSFAcc = 0; dwExtSFAcc = 0; std::string SignalNo= " Waveform number " + Tool::toString(cSignalNoIndex); Results[cSignalNoIndex].printWaveForm(SignalNo); // Prepare Input vectors for FFT compute cComponent = 0; while (cComponent &lt; (HCYCLE_SAMPLES &lt;&lt; 1)) { awReal[cComponent] = static_cast&lt;int&gt;(Results[cSignalNoIndex].WaveForm[cComponent/64][cComponent % 64]); awImg[cComponent] = 0; pwSource++; cComponent++; } Results[cSignalNoIndex].printWaveForm(SignalNo); // Get FFT (forward) // Changed the wPwr from 7 to something else iFft(&amp;awReal[0], &amp;awImg[0], wPwr, 1); Results[cSignalNoIndex].printWaveForm(SignalNo); // Compute magnitudes //fMult = pInBlock3-&gt;fMult[cSignalNoIndex]; // Get Multiplier fMult = 1; for (cComponent = 0; cComponent &lt; HCYCLE_SAMPLES &amp;&amp; !ShutDownFlag; cComponent++) { int64_t dlOp = static_cast&lt;int64_t&gt;(awReal[cComponent]) * awReal[cComponent] + static_cast&lt;int64_t&gt;(awImg[cComponent]) * awImg[cComponent]; dlOp &lt;&lt;= 1; // Apply sqrt(2) term to result dlOp = static_cast&lt;int&gt;(fMult * isqrt64(dlOp)); // Store into FFT object oFFTMag3.wFFT[cSignalNoIndex][cComponent] = static_cast&lt;int16_t&gt;( dlOp ); // Set Base frequency magnitude and accumulate harmonics if (cComponent == 1) // Base { wSF0 = dlOp; if(cSignalNoIndex == 6) { wRefMagnitude = static_cast&lt;int16_t&gt; ( 0.4 * wSF0 ); } if(awReal[1] != 0) // Also get phase for Base { dfPhase = std::atan((double)((float)awImg[1]/awReal[1])) * 180.0 / PI; } else { if(awImg[1] &gt;= 0) { dfPhase = 90.0; } else { dfPhase = -90.0; } } if(awReal[1] &lt; 0) // convert to 2*PI range { dfPhase += 180.0; } else if(awImg[1] &lt; 0) { dfPhase += 360.0; } //// THIS IS THE LINE fPhase[cSignalNoIndex] = dfPhase; ////////// WTF! cSignalNoIndex = 6 - cComponent = 2 /// HERE cSignalNoIndex is overflown } } </code></pre>
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    1. USClaudiordgz
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    1. COThere is no way to help without the contents of "Inner Loop" and "Inner Inner Loop"...
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      1. USRamon J Romero y Vigil
    2. CO"Theory", you've corrupted the stack.
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      1. USChad
    3. COMaybe you are smashing the stack someplace, please show some real code, it will help us help you.
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      1. USShafik Yaghmour
 

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