Class CancelPointInstr

java.lang.Object

org.ek9lang.compiler.ir.instructions.IRInstr

org.ek9lang.compiler.ir.instructions.CancelPointInstr

All Implemented Interfaces:

INode

public final class CancelPointInstr
extends IRInstr

CANCEL_POINT: a point where an async task the pipeline no longer needs stops (EK9_BACKEND_IR_CONTRACTS.md Contract 24). When the running task's cancellation has been requested and not yet delivered, it is delivered: the task unwinds as org.ek9.lang::Cancelled, which no catch of an EK9 Exception catches and every finally sees. Anywhere else - off an async task, or once delivered - it does nothing.

Placed only by IR_OPTIMISATION (CancelPointPlacement) in an operation the runtime may call - the complement of SafePointInstr - so a task running EK9 code that never reaches a runtime wait still stops within one loop iteration or one call. No result, no operands, no debug information (it is no source line).

Constructor Summary

Constructors

Constructor	Description
CancelPointInstr()

Method Summary

Methods inherited from class IRInstr

accept, addOperand, addOperands, equals, getDebugInfo, getEscapeMetaData, getOpcode, getOperands, getResult, hasEscapeMetaData, hashCode, hasResult, isControlFlow, isLabel, isMemoryManagement, isMethodCall, setEscapeMetaData, toString

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

CancelPointInstr

public CancelPointInstr()