Class ThrowInstrAsmGenerator

java.lang.Object

org.ek9lang.compiler.backend.jvm.AbstractAsmGenerator

org.ek9lang.compiler.backend.jvm.ThrowInstrAsmGenerator

All Implemented Interfaces:

Consumer<ThrowInstr>

final class ThrowInstrAsmGenerator
extends AbstractAsmGenerator
implements Consumer<ThrowInstr>

Specialized ASM generator for ThrowInstr processing. Handles THROW operations - generates ATHROW bytecode instruction to throw exceptions.

JVM ATHROW Behavior: - Stack before: [objectref] (exception object on stack) - Stack after: [] (empty - execution transfers to exception handler or exits method) - Opcode: ATHROW (191 / 0xBF) - Throws: NullPointerException if objectref is null

Pattern: 1. Exception object created via constructor call (already on stack or in variable) 2. RETAIN and SCOPE_REGISTER performed by IR (ARC semantics) 3. THROW loads variable and executes ATHROW 4. JVM searches for matching exception handler in current method 5. If no handler found, method exits and search continues up call stack

Nested Class Summary

Nested classes/interfaces inherited from class AbstractAsmGenerator

AbstractAsmGenerator.LocalVariableInfo, AbstractAsmGenerator.MethodContext, AbstractAsmGenerator.ScopeInfo, AbstractAsmGenerator.TempVariableSource

Field Summary

Fields inherited from class AbstractAsmGenerator

classWriter, constructTargetTuple, outputVisitor

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
void	accept(ThrowInstr throwInstr)	Generate JVM ATHROW instruction for a throw statement.

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, 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

ThrowInstrAsmGenerator

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

Method Details

accept

public void accept(ThrowInstr throwInstr)

Generate JVM ATHROW instruction for a throw statement. Loads the exception variable onto the stack and throws it.

Specified by:

accept in interface Consumer<ThrowInstr>