This project adds a @Bytecode AST transformation to Groovy, which will let you write bytecode directly as a method body!
This is for educational purposes only. I would never use this in real production code.
If you use Gradle:
build.gradle
repositories {
maven { url 'http://oss.jfrog.org/oss-release-local' }
}
dependencies {
compile 'me.champeau.groovy:bytecode-xform:0.2.0'
}Note that you might have to use a weird classloading trick like the one here if you face a classloader constraint violation.
But if you really insist on using Maven:
pom.xml
<dependencies>
<dependency>
<groupId>me.champeau.groovy</groupId>
<artifactId>bytecode-xform</artifactId>
<version>0.2.0</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>jfrog</id>
<url>http://oss.jfrog.org/oss-release-local</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>Then you can start using it in your Groovy code like in this example:
@groovyx.ast.bytecode.Bytecode
int fib(int n) {
l0:
iload 1
iconst_2
if_icmpge l1
iload 1
_goto l2
l1:
aload 0
iload 1
iconst_2
isub
invokevirtual '.fib','(I)I'
aload 0
iload 1
iconst_1
isub
invokevirtual '.fib', '(I)I'
iadd
l2:
ireturn
}A detailed explanation of the concept and why it was done can be found on some blog posts I wrote:
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