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Karsk - java bytecode writer
, (*1)
Karsk is direct port of ASM "a very small and fast Java bytecode manipulation framework"., (*2)
This is highly experimental and very much work in progress at this moment. Any help is welcome!, (*3)
Preferred way to install framework is with composer:, (*4)
composer require kambo/karsk
public class Helloworld {
public static void main (String[] args) {
System.out.println("Hello world!");
}
}
<?php
use Kambo\Karsk\ClassWriter;
use Kambo\Karsk\Opcodes;
$cw = new ClassWriter(0);
$cw->visit(
Opcodes::V1_8,
Opcodes::ACC_PUBLIC,
"Helloworld",
null,
"java/lang/Object",
null
);
$mw = $cw->visitMethod(Opcodes::ACC_PUBLIC, "<init>", "()V", null, null);
$mw->visitVarInsn(Opcodes::ALOAD, 0);
$mw->visitMethodInsn(Opcodes::INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
$mw->visitInsn(Opcodes::RETURN_);
$mw->visitMaxs(1, 1);
$mw->visitEnd();
$mainMethod = $cw->visitMethod(
(Opcodes::ACC_PUBLIC + Opcodes::ACC_STATIC),
"main",
"([Ljava/lang/String;)V",
null,
null
);
$mainMethod->visitFieldInsn(Opcodes::GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
$mainMethod->visitLdcInsn("Hello world!");
$mainMethod->visitMethodInsn(
Opcodes::INVOKEVIRTUAL,
"java/io/PrintStream",
"println",
"(Ljava/lang/String;)V",
false
);
$mainMethod->visitInsn(Opcodes::RETURN_);
$mainMethod->visitMaxs(2, 2);
$mainMethod->visitEnd();
$code = $cw->toByteArray();
3-Clause BSD, https://opensource.org/licenses/BSD-3-Clause, (*5)
Karsk - java bytecode writer
MIT