Avoid Null receiver values are not supported by libraries

[JaroslavTulach]

Pull Request Description

Cannot query TypeOfNode for null.

Checklist

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• All code follows the
  Java,

[JaroslavTulach]

This was in the log:

java.lang.NullPointerException: Null receiver values are not supported by libraries.
        at org.graalvm.truffle/com.oracle.truffle.api.library.LibraryFactory.dispatch(LibraryFactory.java:528)
        at org.graalvm.truffle/com.oracle.truffle.api.library.LibraryFactory.getUncached(LibraryFactory.java:396)
        at org.enso.interpreter.runtime.library.dispatch.TypesLibraryGen$UncachedDispatch.hasType(TypesLibraryGen.java:397)
        at org.enso.interpreter.node.expression.builtin.meta.TypeOfNodeGen$Uncached.execute(TypeOfNodeGen.java:443)
        at org.enso.interpreter.service.ExecutionCallbacks.typeOf(ExecutionCallbacks.java:150)
        at org.enso.interpreter.service.ExecutionCallbacks.updateCachedResult(ExecutionCallbacks.java:91)
        at org.enso.interpreter.instrument.IdExecutionInstrument$IdEventNodeFactory$IdExecutionEventNode.onExpressionReturn(IdExecutionInstrument.java:175)
        at org.enso.interpreter.instrument.IdExecutionInstrument$IdEventNodeFactory$IdExecutionEventNode.onReturnValue(IdExecutionInstrument.java:156)

[hubertp]

We probably don't have an example that caused it, do we?

[JaroslavTulach]

I have seen the problem while working on today's bookclub: Students_And_Courses.zip - not which revision was causing the problem however.

[JaroslavTulach]

CCing @Akirathan

We probably don't have an example that caused it, do we?

I have another program that yields NullPointerException:

from Standard.Base import all

from Standard.Base.Data.Text import Extensions
from Standard.Table import all
from Standard.Database import all
from Standard.AWS import all
import Standard.Visualization

polyglot java import java.util.Random

main = 
    operator1 = Random.new

this yields error

Main.enso:9:1: error: Symbol 'Random' resolved ambiguously to 'java.util.Random' in the import Statement. The symbol was first resolved to 'Standard.Base.Random' in the import statement 'Main.enso[1:1-1:29]'.
    9 | polyglot java import java.util.Random
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

when executed from CLI. But in IDE it creates a ConstantNode with null value:

java.lang.NullPointerException: nullibution 24s
        at java.base/java.util.Objects.requireNonNull(Objects.java:209)
        at org.enso.interpreter.node.expression.constant.ConstantObjectNode.<init>(ConstantObjectNode.java:16)
        at org.enso.interpreter.node.expression.constant.ConstantObjectNode.build(ConstantObjectNode.java:26)
        at org.enso.compiler.codegen.IrToTruffle$ExpressionProcessor.nodeForResolution(IrToTruffle.scala:1685)
        at org.enso.compiler.codegen.IrToTruffle$ExpressionProcessor.processName(IrToTruffle.scala:1602)
        at org.enso.compiler.codegen.IrToTruffle$ExpressionProcessor.org$enso$compiler$codegen$IrToTruffle$ExpressionProcessor$$run(IrToTruffle.scala:1003)
        at org.enso.compiler.codegen.IrToTruffle$ExpressionProcessor.run(IrToTruffle.scala:991)
        at org.enso.compiler.codegen.IrToTruffle$CallArgumentProcessor.run(IrToTruffle.scala:2085)
        at org.enso.compiler.codegen.IrToTruffle$ExpressionProcessor.$anonfun$processApplicationWithArgs$2(IrToTruffle.scala:1999)

Fixed as #8061