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Handle having attempted to read from a variable that does not currently have a value. This shrinks the control flow graph in L2, which is not just a time saving during creation and memory saving ongoing, but may also increase HotSpot's effectiveness.
This Interpreter's function is expected to contain the current function.
Note that if the handler (HookType.READ_UNASSIGNED_VARIABLE) asks to reify, this method will construct a continuation representing the current function. The continuation frame can't be resumed, so it will use the unoptimizedChunk's ChunkEntryPoint.UNREACHABLE.
Return
Either null or a StackReifier that the calling code should simply return. This method creates a stack frame on behalf of the current executing function if needed.
Parameters
The level one A_Continuation.pc to use in a new continuation, if reification happens inside the error handler.
The level one parameter stack pointer to use in a new continuation, if reification happens inside the error handler.
Values that will populate a continuation's frame slots if reification happens inside the error handler.