Package org.codehaus.groovy.classgen

# Class BytecodeExpression

java.lang.Object
org.codehaus.groovy.ast.ASTNode
org.codehaus.groovy.ast.AnnotatedNode
org.codehaus.groovy.ast.expr.Expression
org.codehaus.groovy.classgen.BytecodeExpression

All Implemented Interfaces:
  `GroovydocHolder<AnnotatedNode>`, `NodeMetaDataHandler`

Direct Known Subclasses:
  `ExpressionAsVariableSlot`, `VariableSlotLoader`

public abstract class BytecodeExpression extends Expression
Represents some custom bytecode generation by the compiler.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final BytecodeExpression`
  `NOP`
  A no-operation bytecode expression that generates no instructions.

  ### Fields inherited from class org.codehaus.groovy.ast.expr.Expression

  `EMPTY_ARRAY`

  ### Fields inherited from interface groovy.lang.groovydoc.GroovydocHolder

  `DOC_COMMENT`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `BytecodeExpression()`
  Creates a new bytecode expression.
  `BytecodeExpression(ClassNode type)`
  Creates a new bytecode expression with the specified type.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `String`
  `getText()`
  Returns a human-readable text representation of this AST node.
  `Expression`
  `transformExpression(ExpressionTransformer transformer)`
  Transforms this expression and any nested expressions according to the provided transformer.
  `void`
  `visit(GroovyCodeVisitor visitor)`
  Accepts a code visitor for AST traversal and transformation.
  `abstract void`
  `visit(org.objectweb.asm.MethodVisitor visitor)`
  Emits bytecode instructions using the provided method visitor.

  ### Methods inherited from class org.codehaus.groovy.ast.expr.Expression

  `getType, setType, transformExpressions, transformExpressions`

  ### Methods inherited from class org.codehaus.groovy.ast.AnnotatedNode

  `addAnnotation, addAnnotation, addAnnotations, getAnnotations, getAnnotations, getDeclaringClass, getGroovydoc, getInstance, hasNoRealSourcePosition, isSynthetic, setDeclaringClass, setHasNoRealSourcePosition, setSynthetic`

  ### Methods inherited from class org.codehaus.groovy.ast.ASTNode

  `copyNodeMetaData, getColumnNumber, getLastColumnNumber, getLastLineNumber, getLineNumber, getMetaDataMap, setColumnNumber, setLastColumnNumber, setLastLineNumber, setLineNumber, setMetaDataMap, setSourcePosition`

  ### Methods inherited from class java.lang.Object

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

  ### Methods inherited from interface org.codehaus.groovy.ast.NodeMetaDataHandler

  `copyNodeMetaData, getNodeMetaData, getNodeMetaData, getNodeMetaData, newMetaDataMap, putNodeMetaData, removeNodeMetaData, setNodeMetaData`

- ## Field Details

  - ### NOP

    public static final BytecodeExpression NOP
    A no-operation bytecode expression that generates no instructions.

- ## Constructor Details

  - ### BytecodeExpression

    public BytecodeExpression()
    Creates a new bytecode expression.

  - ### BytecodeExpression

    public BytecodeExpression(ClassNode type)
    Creates a new bytecode expression with the specified type.
    Parameters:
      `type` - the type of the expression

- ## Method Details

  - ### getText

    public String getText()
    Returns a human-readable text representation of this AST node. Used for debugging and error messages. Default implementation returns a message indicating the representation is not yet implemented for this node type.
    Overrides:
      `getText` in class `ASTNode`
    Returns:
      text representation of this node, or placeholder for unimplemented types

  - ### visit

    public abstract void visit(org.objectweb.asm.MethodVisitor visitor)
    Emits bytecode instructions using the provided method visitor.
    Parameters:
      `visitor` - the ASM method visitor to generate bytecode

  - ### visit

    public void visit(GroovyCodeVisitor visitor)
    Accepts a code visitor for AST traversal and transformation. Subclasses must implement this method to support visitor pattern-based processing. The visitor pattern enables decoupling of AST structure from processing logic.
    Overrides:
      `visit` in class `ASTNode`
    Parameters:
      `visitor` - the `GroovyCodeVisitor` to process this node

  - ### transformExpression

    public Expression transformExpression(ExpressionTransformer transformer)
    Transforms this expression and any nested expressions according to the provided transformer. This method is called during AST transformation phases and must recursively transform any nested expressions to support full AST tree transformation.
    Specified by:
      `transformExpression` in class `Expression`
    Parameters:
      `transformer` - the `ExpressionTransformer` to apply
    Returns:
      a transformed copy of this expression (or this expression itself if no changes are needed)