oak-jasm 0.0.11

JASM assembly language parser with support for modern assembly syntax and features.
Documentation 
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// JASM (Java Assembly) basic syntax test file
// This demonstrates Java bytecode assembly syntax

.class public HelloWorld
.super java/lang/Object

// Field declarations
.field private message Ljava/lang/String;
.field public static final PI D = 3.14159
.field protected count I = 0
.field static instance LHelloWorld;

// Method: main entry point
.method public static main([Ljava/lang/String;)V
    .limit stack 10
    .limit locals 2
    
    // Create new instance
    new HelloWorld
    dup
    invokespecial HelloWorld/<init>()V
    astore_1
    
    // Call instance method
    aload_1
    invokevirtual HelloWorld/greet()V
    
    // Print message
    getstatic java/lang/System/out Ljava/io/PrintStream;
    ldc "Program completed successfully"
    invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
    
    return
.end method

// Constructor
.method public <init>()V
    .limit stack 1
    .limit locals 1
    
    aload_0
    invokespecial java/lang/Object/<init>()V
    
    // Initialize field
    aload_0
    ldc "Hello from JASM!"
    putfield HelloWorld/message Ljava/lang/String;
    
    return
.end method

// Instance method
.method public greet()V
    .limit stack 2
    .limit locals 1
    
    getstatic java/lang/System/out Ljava/io/PrintStream;
    aload_0
    getfield HelloWorld/message Ljava/lang/String;
    invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
    
    return
.end method

// Static method with parameters
.method public static add(II)I
    .limit stack 2
    .limit locals 2
    
    iload_0
    iload_1
    iadd
    ireturn
.end method

// Method with exception handling
.method public riskyMethod()V
    .limit stack 2
    .limit locals 2
    
    .try {
        // Code that might throw exception
        new java/lang/Exception
        dup
        ldc "Something went wrong"
        invokespecial java/lang/Exception/<init>(Ljava/lang/String;)V
        athrow
    } catch java/lang/Exception {
        // Exception handler
        astore_1
        getstatic java/lang/System/out Ljava/io/PrintStream;
        ldc "Exception caught: "
        invokevirtual java/io/PrintStream/print(Ljava/lang/String;)V
        
        aload_1
        invokevirtual java/lang/Exception/getMessage()Ljava/lang/String;
        invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
    }
    
    return
.end method

// Method with loops
.method public static factorial(I)I
    .limit stack 2
    .limit locals 3
    
    iconst_1
    istore_1
    
    iconst_0
    istore_2
    
loop_start:
    iload_2
    iload_0
    if_icmpge loop_end
    
    iload_1
    iload_2
    iconst_1
    iadd
    imul
    istore_1
    
    iinc 2 1
    goto loop_start
    
loop_end:
    iload_1
    ireturn
.end method

// Interface implementation
.class public interface abstract Calculator
.super java/lang/Object

.method public abstract calculate(DD)D
.end method

// Class implementing interface
.class public SimpleCalculator
.super java/lang/Object
.implements Calculator

.method public calculate(DD)D
    .limit stack 4
    .limit locals 4
    
    dload_1
    dload_3
    dadd
    dreturn
.end method