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Pierre-Yves Ricau / Py @Piwai Square

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@Piwai

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@Piwai

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@Piwai

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@Piwai

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Nuking Nasty Memory Leaks Devoxx US, 2017: https://youtu.be/fhE--eTEW84 @Piwai

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@Piwai

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* Instance of com.squareup.ui.permissions.PasscodeUnlockView | mAccessibilityCursorPosition = -1 | mAccessibilityDelegate = null | mAccessibilityTraversalAfterId = -1 | mAccessibilityTraversalBeforeId = -1 | mAccessibilityViewId = -1 | mAnimator = null | mAttachInfo = null | mAttributes = null | mBackground = android.graphics.drawable.ColorDrawable@328049760 (0x138da | mBackgroundRenderNode = android.view.RenderNode@338685248 (0x142fed40) | mBackgroundResource = 0 | mBackgroundSizeChanged = false | mBackgroundTint = null | mBottom = 1731 | mCachingFailed = false | mClipBounds = null @Piwai

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class ActivityInspector : Reachability.Inspector { override fun expectedReachability(element: LeakTraceElement): Reachability { val fieldValue = element.getFieldReferenceValue("mDestroyed") if (fieldValue == null) { return Reachability.unknown() } return if (fieldValue == "true") { Reachability.unreachable("Activity#mDestroyed is true") } else { Reachability.reachable("Activity#mDestroyed is false") } } } @Piwai

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private fun createGroupHash(): String { val uniqueString = if (excludedLeak) { leakTrace.firstElementExclusion.matching } else { leakTrace.leakCauses .joinToString(separator = "") { element -> val referenceName = element.reference!!.groupingName element.className + referenceName } } return uniqueString.createSHA1Hash() } @Piwai

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New Heap Dump Parser??? @Piwai

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fun open(heapDump: File): HprofParser { val inputStream = heapDump.inputStream() val channel = inputStream.channel val source = inputStream.source() .buffer() // ... } @Piwai

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fun open(heapDump: File): HprofParser { val inputStream = heapDump.inputStream() val channel = inputStream.channel val source = inputStream.source() .buffer() // ... } fun moveTo(newPosition: Long) { if (position == newPosition) { return } source.buffer.clear() channel.position(newPosition) position = newPosition } @Piwai

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while (!exhausted()) { // type of the record val tag = readUnsignedByte() // number of microseconds since the time stamp in the header skip(INT_SIZE) // number of bytes that follow and belong to this record val length = readUnsignedInt() when (tag) { STRING_IN_UTF8 -> { val callback = callbacks.get() val id = readId() val stringLength = length - idSize val string = readUtf8(stringLength) callback(StringRecord(id, string)) } // ... @Piwai

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// ... LOAD_CLASS -> { val classSerialNumber = readInt() val id = readId() val stackTraceSerialNumber = readInt() val classNameStringId = readId() @Piwai

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Pierre-Yves Ricau / Py @Piwai Square