I am encountering a NullPointerException within R8 when trying to build a libgdx application, after running it through DashO's block splitting transformation (i.e., a part of its control flow obfuscation):

Current version is: 1.4.94 (build 390954928f0db9c3b888a367f7f128ce3bbfb160 from go/r8bot (luci-r8-ci-archive-0-5g74)).

...
Caused by: java.lang.NullPointerException
at com.android.tools.r8.ir.analysis.constant.ConstLatticeElement.meet(ConstLatticeElement.java:23)
at com.android.tools.r8.ir.analysis.constant.SparseConditionalConstantPropagation.visitPhi(SparseConditionalConstantPropagation.java:137)
at com.android.tools.r8.ir.analysis.constant.SparseConditionalConstantPropagation.run(SparseConditionalConstantPropagation.java:55)
at com.android.tools.r8.ir.conversion.IRConverter.rewriteCode(IRConverter.java:961)
at com.android.tools.r8.ir.conversion.IRConverter.processMethod(IRConverter.java:805)
at com.android.tools.r8.ir.conversion.IRConverter.lambda$optimize$5(IRConverter.java:551)
at com.android.tools.r8.ir.conversion.CallGraph.lambda$forEachMethod$6(CallGraph.java:468)

This occurs only when optimization is applied. It appears to be encountering this specifically if block splitting is applied to com.badlogic.gdx.backends.android.AndroidInputFactory.newAndroidInput.

Since the Java bytecode that causes this is produced by a proprietary transform that is nontrivial to set up, I've attached a zip file containing two jars and some rules. You can reproduce the issue by invoking R8 in the following manner:

java -jar [path to r8 jar] --pg-conf dontshrink.txt --pg-conf proguard-android-optimize.txt-3.4.0 --lib 3.jar --lib [path to android.jar] 0.jar

I most recently used a local build of r8 using the master branch, commit 559e5b3b1e112e12e31e7f46f48d2a3d004176a9.

Issue 132897042

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