A Java-language API for doing compile time or runtime code generation targeting the Dalvik VM. Unlike
[cglib](http://cglib.sourceforge.net/) or [ASM](http://asm.ow2.org/), this library creates Dalvik `.dex`
files instead of Java `.class` files.

It has a small, close-to-the-metal API. This API mirrors the
[Dalvik bytecode specification](http://source.android.com/tech/dalvik/dalvik-bytecode.html) giving you tight
control over the bytecode emitted. Code is generated instruction-by-instruction; you bring your own abstract
syntax tree if you need one. And since it uses Dalvik's `dx` tool as a backend, you get efficient register
allocation and regular/wide instruction selection for free.

Class Proxies
-------------

Dexmaker includes a stock code generator for [class proxies](http://dexmaker.googlecode.com/git/javadoc/com/google/dexmaker/stock/ProxyBuilder.html).
If you just want to do AOP or class mocking, you don't need to mess around with bytecodes.

Mockito Mocks
-------------

Dexmaker includes class proxy support for [Mockito](http://code.google.com/p/mockito/). Add the mockito
and the dexmaker `.jar` files to your Android test project's `libs/` directory and you can use Mockito
in your Android unit tests.

This requires Mockito 1.10.5 or newer.

Runtime Code Generation
-----------------------

This example generates a class and a method. It then loads that class into the current process and invokes its method.
```
public final class HelloWorldMaker {
    public static void main(String[] args) throws Exception {
        DexMaker dexMaker = new DexMaker();

        // Generate a HelloWorld class.
        TypeId<?> helloWorld = TypeId.get("LHelloWorld;");
        dexMaker.declare(helloWorld, "HelloWorld.generated", Modifier.PUBLIC, TypeId.OBJECT);
        generateHelloMethod(dexMaker, helloWorld);

        // Create the dex file and load it.
        File outputDir = new File(".");
        ClassLoader loader = dexMaker.generateAndLoad(HelloWorldMaker.class.getClassLoader(),
                outputDir, outputDir);
        Class<?> helloWorldClass = loader.loadClass("HelloWorld");

        // Execute our newly-generated code in-process.
        helloWorldClass.getMethod("hello").invoke(null);
    }

    /**
     * Generates Dalvik bytecode equivalent to the following method.
     *    public static void hello() {
     *        int a = 0xabcd;
     *        int b = 0xaaaa;
     *        int c = a - b;
     *        String s = Integer.toHexString(c);
     *        System.out.println(s);
     *        return;
     *    }
     */
    private static void generateHelloMethod(DexMaker dexMaker, TypeId<?> declaringType) {
        // Lookup some types we'll need along the way.
        TypeId<System> systemType = TypeId.get(System.class);
        TypeId<PrintStream> printStreamType = TypeId.get(PrintStream.class);

        // Identify the 'hello()' method on declaringType.
        MethodId hello = declaringType.getMethod(TypeId.VOID, "hello");

        // Declare that method on the dexMaker. Use the returned Code instance
        // as a builder that we can append instructions to.
        Code code = dexMaker.declare(hello, Modifier.STATIC | Modifier.PUBLIC);

        // Declare all the locals we'll need up front. The API requires this.
        Local<Integer> a = code.newLocal(TypeId.INT);
        Local<Integer> b = code.newLocal(TypeId.INT);
        Local<Integer> c = code.newLocal(TypeId.INT);
        Local<String> s = code.newLocal(TypeId.STRING);
        Local<PrintStream> localSystemOut = code.newLocal(printStreamType);

        // int a = 0xabcd;
        code.loadConstant(a, 0xabcd);

        // int b = 0xaaaa;
        code.loadConstant(b, 0xaaaa);

        // int c = a - b;
        code.op(BinaryOp.SUBTRACT, c, a, b);

        // String s = Integer.toHexString(c);
        MethodId<Integer, String> toHexString
                = TypeId.get(Integer.class).getMethod(TypeId.STRING, "toHexString", TypeId.INT);
        code.invokeStatic(toHexString, s, c);

        // System.out.println(s);
        FieldId<System, PrintStream> systemOutField = systemType.getField(printStreamType, "out");
        code.sget(systemOutField, localSystemOut);
        MethodId<PrintStream, Void> printlnMethod = printStreamType.getMethod(
                TypeId.VOID, "println", TypeId.STRING);
        code.invokeVirtual(printlnMethod, null, localSystemOut, s);

        // return;
        code.returnVoid();
    }
}
```

Use it in your app
------------------

For Mockito support, download the latest .jar via Maven:
```xml
    <dependency>
      <groupId>com.linkedin.dexmaker</groupId>
      <artifactId>dexmaker-mockito</artifactId>
      <version>2.25.0</version>
      <type>pom</type>
    </dependency>
```

```
    androidTestCompile 'com.linkedin.dexmaker:dexmaker-mockito:2.25.0'
```

Download [dexmaker-1.2.jar](http://search.maven.org/remotecontent?filepath=com/google/dexmaker/dexmaker/1.2/dexmaker-1.2.jar)
and [dexmaker-mockito-1.2.jar](http://search.maven.org/remotecontent?filepath=com/google/dexmaker/dexmaker-mockito/1.2/dexmaker-mockito-1.2.jar).

Run the Unit Tests
------------------

The unit tests for dexmaker must be run on a dalvikvm. In order to do this, you can use [Vogar](https://code.google.com/p/vogar/) in the following fashion:

```
$ java -jar vogar.jar --mode device --sourcepath /path/to/dexmaker/dexmaker/src/test/java --sourcepath /path/to/dexmaker/dexmaker/src/main/java --sourcepath /path/to/dexmaker/dx/src/main/java --device-dir /data/dexmaker /path/to/dexmaker/dexmaker/src/test/
```

Download [vogar.jar](https://vogar.googlecode.com/files/vogar.jar).

URL: https://github.com/linkedin/dexmaker/
Version: master (8ff85edb2793cc1e0f6a93c67b127cb9c43d924e)
License: Apache 2.0
Description:
Dexmaker is a Java-language API for doing compile time or runtime code generation targeting the Dalvik VM. Unlike cglib or ASM, this library creates Dalvik .dex files instead of Java .class files.

It has a small, close-to-the-metal API. This API mirrors the Dalvik bytecode specification giving you tight control over the bytecode emitted. Code is generated instruction-by-instruction; you bring your own abstract syntax tree if you need one. And since it uses Dalvik's dx tool as a backend, you get efficient register allocation and regular/wide instruction selection for free.

It includes a stock code generator for class proxies. If you just want to do AOP or class mocking, you don't need to mess around with bytecodes.

Local Modifications:
        Add ability to run dexmaker tests from within the source tree (I1b146841099b54f64d4a7dfe743b88717793619a)
        Allow to share classloader via dexmaker.share_classloader system property (I324cddd644610eef811c620a1fccf6a24b2b9406)
        Do not read Build.VERSION to allow non-standard Android distributions (Ia8c4ba4c82cd6f193c565f1bfe48faffc4aac08f)
        Temporarily ignore failing test (Ibf7b6c2eb05c5ff83f0817f9224369e20c0b775d)
        Restrict InspectClass to current thread. (Ic62951ff81bed60ac7512455fad65210e4b728a9, need upstreaming)
        Exclude Stress#mockALot from presubmit (Ic9a2927ffa07924bd759429e31c56dc1b71a826c)
        Extend timeout of Stress#mockALot() for CTS. (Iad30a8cb07b38054b490b7006d11908fc752a024)
        Update to Mockito 2.25.0 and impl InlineMockMaker (29a8674036d345e4ec8635b1d38d8b2a4fe91980a, need upstreaming)
	guessPath not to depend on the first level of app directory (I66f1d7036949c2f05e6d37bc270d47f8e77e51c1, need upstreaming)