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NPE in IR's LiveVariableAnalysis when running JIT passes #2345

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headius opened this issue Dec 22, 2014 · 1 comment
Closed

NPE in IR's LiveVariableAnalysis when running JIT passes #2345

headius opened this issue Dec 22, 2014 · 1 comment

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@headius
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@headius headius commented Dec 22, 2014

I'm not sure if this has to do with the JIT passes or if it's something deeper, but when I run with jit.threshold=0 and do gem install somegem, I get at least four methods that fail with the following trace. For this case, these are the only methods left that fail to compile on threshold=0.

2014-12-22T14:44:11.053-06:00: JITCompiler: Could not compile; passes run: [org.jruby.ir.passes.OptimizeTempVarsPass@96737c1e, org.jruby.ir.passes.CFGBuilder@500ca39f, org.jruby.ir.passes.LocalOptimizationPass@584ed071, org.jruby.ir.passes.AddCallProtocolInstructions@87f2d916, org.jruby.ir.passes.LiveVariableAnalysis@a0f4adec]:Config.Resolv::DNS::Config.lazy_initialize at /Users/headius/projects/jruby/lib/ruby/stdlib/resolv.rb:977 because of: "null"
java.lang.NullPointerException
    at org.jruby.ir.dataflow.analyses.LiveVariableNode.applyPreMeetHandler(LiveVariableNode.java:60)
    at org.jruby.ir.dataflow.FlowGraphNode.computeDataFlowInfo(FlowGraphNode.java:111)
    at org.jruby.ir.dataflow.DataFlowProblem.compute_MOP_Solution(DataFlowProblem.java:56)
    at org.jruby.ir.dataflow.analyses.LiveVariableNode.applyTransferFunction(LiveVariableNode.java:155)
    at org.jruby.ir.dataflow.FlowGraphNode.computeDataFlowInfoBackward(FlowGraphNode.java:133)
    at org.jruby.ir.dataflow.FlowGraphNode.computeDataFlowInfo(FlowGraphNode.java:116)
    at org.jruby.ir.dataflow.DataFlowProblem.compute_MOP_Solution(DataFlowProblem.java:56)
    at org.jruby.ir.dataflow.analyses.LiveVariableNode.applyTransferFunction(LiveVariableNode.java:155)
    at org.jruby.ir.dataflow.FlowGraphNode.computeDataFlowInfoBackward(FlowGraphNode.java:133)
    at org.jruby.ir.dataflow.FlowGraphNode.computeDataFlowInfo(FlowGraphNode.java:116)
    at org.jruby.ir.dataflow.DataFlowProblem.compute_MOP_Solution(DataFlowProblem.java:56)
    at org.jruby.ir.dataflow.analyses.LiveVariableNode.applyTransferFunction(LiveVariableNode.java:155)
    at org.jruby.ir.dataflow.FlowGraphNode.computeDataFlowInfoBackward(FlowGraphNode.java:133)
    at org.jruby.ir.dataflow.FlowGraphNode.computeDataFlowInfo(FlowGraphNode.java:116)
    at org.jruby.ir.dataflow.DataFlowProblem.compute_MOP_Solution(DataFlowProblem.java:56)
    at org.jruby.ir.passes.LiveVariableAnalysis.execute(LiveVariableAnalysis.java:92)
    at org.jruby.ir.passes.CompilerPass.run(CompilerPass.java:105)
    at org.jruby.ir.passes.CompilerPass.makeSureDependencyHasRunOnce(CompilerPass.java:127)
    at org.jruby.ir.passes.CompilerPass.run(CompilerPass.java:95)
    at org.jruby.ir.passes.CompilerPass.run(CompilerPass.java:119)
    at org.jruby.ir.IRScope.runCompilerPasses(IRScope.java:557)
    at org.jruby.ir.IRScope.prepareForCompilation(IRScope.java:627)
    at org.jruby.ir.targets.JVMVisitor.emitScope(JVMVisitor.java:135)
    at org.jruby.ir.targets.JVMVisitor.emitWithSignatures(JVMVisitor.java:265)
    at org.jruby.ir.targets.JVMVisitor.emitMethodJIT(JVMVisitor.java:255)
    at org.jruby.ir.targets.JVMVisitor.codegenScope(JVMVisitor.java:102)
    at org.jruby.ir.targets.JVMVisitor.compileToBytecode(JVMVisitor.java:67)
    at org.jruby.compiler.JITCompiler$JITClassGenerator.compile(JITCompiler.java:341)
    at org.jruby.compiler.JITCompiler$JITTask.run(JITCompiler.java:215)
    at org.jruby.compiler.JITCompiler.jitThresholdReached(JITCompiler.java:173)
    at org.jruby.internal.runtime.methods.InterpretedIRMethod.tryJit(InterpretedIRMethod.java:237)
    at org.jruby.internal.runtime.methods.InterpretedIRMethod.call(InterpretedIRMethod.java:110)
    at org.jruby.ir.targets.InvokeSite.invoke(InvokeSite.java:135)
    at Users.headius.projects.jruby.lib.ruby.stdlib.resolv.lazy_initialize_CLOSURE_1__lazy_initialize_0(/Users/headius/projects/jruby/lib/ruby/stdlib/resolv.rb:361)
@headius
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@headius headius commented Jan 14, 2015

I no longer see this on master and "gem install somegem" with threshold=0 appears to JIT everything successfully.

@headius headius closed this Jan 14, 2015
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