Class EnumIteratorImplAsmGenerator

java.lang.Object

org.ek9lang.compiler.backend.jvm.AbstractAsmGenerator

org.ek9lang.compiler.backend.jvm.EnumIteratorImplAsmGenerator

All Implemented Interfaces:

Consumer<EnumIteratorImplInstr>

final class EnumIteratorImplAsmGenerator
extends AbstractAsmGenerator
implements Consumer<EnumIteratorImplInstr>

Specialized ASM generator for ENUM_ITERATOR_IMPL instruction.

Generates JVM bytecode for enum iterator implementation. The generated code:

1. Generates an anonymous iterator class (EnumType$EnumIterator) that extends the parameterized Iterator wrapper (_Iterator_HASH...)
2. Creates a java.util.ArrayList containing all enum values
3. Gets a java.util.Iterator from the ArrayList
4. Creates an instance of the anonymous class with the Java iterator
5. Stores result in the designated result variable

Enum fields use Java primitives:

• _ordinal: int (primitive)
• _name: java.lang.String
• _isEnumSet: boolean (primitive)

This approach maintains the EK9 type hierarchy (Iterator of EnumType) while providing efficient iteration over enum values using native Java collections.

Field Summary

Fields inherited from class AbstractAsmGenerator

classWriter, constructTargetTuple, outputVisitor

Constructor Summary

Constructors

Constructor	Description
EnumIteratorImplAsmGenerator(ConstructTargetTuple constructTargetTuple, OutputVisitor outputVisitor, org.objectweb.asm.ClassWriter classWriter)

Method Summary

Modifier and Type	Method	Description
void	accept(EnumIteratorImplInstr instr)	Generate JVM bytecode for ENUM_ITERATOR_IMPL instruction.

Methods inherited from class AbstractAsmGenerator

convertToJvmDescriptor, convertToJvmName, extractFieldName, generateBooleanLiteral, generateCharacterLiteral, generateDebugInfo, generateFloatLiteral, generateIntegerLiteral, generateLoadVariable, generateLocalVariableTable, generateMethodDescriptor, generateObjectLiteral, generateStackOperation, generateStoreVariable, generateStringLiteral, getCurrentMethodVisitor, getFieldDescriptor, getMethodContext, getOrCreateLabel, getOwnerClassName, getVariableIndex, isFieldAccess, isVariableAllocated, isVariableFieldAccess, setCurrentMethodVisitor, setSharedMethodContext, trackTempVariableFromLiteral, trackTempVariableFromLoad

Methods inherited from class Object

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

Methods inherited from interface Consumer

andThen

Constructor Details

EnumIteratorImplAsmGenerator

EnumIteratorImplAsmGenerator(ConstructTargetTuple constructTargetTuple,
 OutputVisitor outputVisitor,
 org.objectweb.asm.ClassWriter classWriter)

Method Details

accept

public void accept(EnumIteratorImplInstr instr)

Generate JVM bytecode for ENUM_ITERATOR_IMPL instruction.

Generated bytecode pattern:

  // Generate anonymous iterator class (done once per enum)
  // EnumType$EnumIterator extends _Iterator_HASH...

  // Create ArrayList and populate with enum values
  NEW java.util.ArrayList
  DUP
  INVOKESPECIAL ArrayList.<init>()
  ASTORE listVar

  // For each enum value (e.g., Red, Green, Blue):
  ALOAD listVar
  NEW EnumType
  DUP
  INVOKESPECIAL EnumType.<init>()
  DUP
  [create Integer for ordinal]
  PUTFIELD EnumType._ordinal
  DUP
  [create String for name]
  PUTFIELD EnumType._name
  INVOKEINTERFACE List.add(Object)
  POP  // discard boolean return

  // Get java.util.Iterator from ArrayList
  ALOAD listVar
  INVOKEINTERFACE List.iterator()
  ASTORE iterVar

  // Create anonymous iterator instance
  NEW EnumType$EnumIterator
  DUP
  ALOAD iterVar
  INVOKESPECIAL EnumType$EnumIterator.<init>(Iterator)
  ASTORE resultVar

Specified by:

accept in interface Consumer<EnumIteratorImplInstr>