Package org.codehaus.groovy.classgen.asm.sc

Class StaticTypesSwitchExpressionWriter

java.lang.Object

org.codehaus.groovy.classgen.asm.SwitchExpressionWriter

org.codehaus.groovy.classgen.asm.sc.StaticTypesSwitchExpressionWriter

public class StaticTypesSwitchExpressionWriter
extends SwitchExpressionWriter

Static-compilation writer for SwitchExpression. Emits tableswitch / lookupswitch when the selector and labels are constants of a type javac would switch on, and otherwise the isCase method selected by the type checker as a direct call.

Since:

6.0.0

Field Summary

Fields inherited from class org.codehaus.groovy.classgen.asm.SwitchExpressionWriter

controller

Constructor Summary

Constructors

Constructor	Description
StaticTypesSwitchExpressionWriter(StaticTypesWriterController controller)	Creates a switch-expression writer for statically compiled methods.

Method Summary

Modifier and Type	Method	Description
protected ClassNode	prepareSelectorType(OperandStack operandStack)	Keeps the selector as visited — boxing is deferred until a path actually needs a reference (isCase or a null check on a wrapper).
protected void	writeIsCaseComparison(CaseStatement caseStatement, int selectorIndex, ClassNode selectorType)	Emits the isCase call selected by the type checker as a direct method call via AsmClassGenerator.visitMethodCallExpression(org.codehaus.groovy.ast.expr.MethodCallExpression), which reaches StaticInvocationWriter.writeDirectMethodCall.
protected boolean	writeOptimizedSwitch(SwitchExpression expression, int selectorIndex, ClassNode selectorType)	Attempts a specialized dispatch (tableswitch / lookupswitch).

Methods inherited from class org.codehaus.groovy.classgen.asm.SwitchExpressionWriter

enumConstantCount, enumConstantName, intConstant, isIntegralType, isIntegralWrapper, resolveResultType, stringConstant, throwIncompatibleClassChangeError, throwUnmatchedSelector, unwrapEnumType, writeDefaultOrThrow, writeSwitchExpression, writeYield

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

StaticTypesSwitchExpressionWriter

public StaticTypesSwitchExpressionWriter(StaticTypesWriterController controller)

Creates a switch-expression writer for statically compiled methods.

Parameters:

controller - the static types writer controller

Method Details

prepareSelectorType

protected ClassNode prepareSelectorType(OperandStack operandStack)

Keeps the selector as visited — boxing is deferred until a path actually needs a reference (isCase or a null check on a wrapper).

Overrides:

prepareSelectorType in class SwitchExpressionWriter

writeOptimizedSwitch

protected boolean writeOptimizedSwitch(SwitchExpression expression,
 int selectorIndex,
 ClassNode selectorType)

Description copied from class: SwitchExpressionWriter

Attempts a specialized dispatch (tableswitch / lookupswitch). The base writer has none; static compilation overrides this.

Overrides:

writeOptimizedSwitch in class SwitchExpressionWriter

Returns:

true if specialized bytecode was emitted

writeIsCaseComparison

protected void writeIsCaseComparison(CaseStatement caseStatement,
 int selectorIndex,
 ClassNode selectorType)

Emits the isCase call selected by the type checker as a direct method call via AsmClassGenerator.visitMethodCallExpression(org.codehaus.groovy.ast.expr.MethodCallExpression), which reaches StaticInvocationWriter.writeDirectMethodCall. A literal case null is identity, not DGM.isCase(Object,Object) (which NPEs). Any other arm must already carry StaticTypesMarker.DIRECT_METHOD_CALL_TARGET on the CaseStatement; missing targets are a type-checking error except under TypeCheckingMode.SKIP.

Overrides:

writeIsCaseComparison in class SwitchExpressionWriter