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Panda Glue is a ASM/AOP module of the Panda Framework.

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package panda.aop.asm;

import panda.asm.MethodVisitor;
import panda.asm.Opcodes;
import panda.asm.Type;

/**
 * @author wendal([email protected])
 */
abstract class NormalMethodAdapter {

	final String desc;

	final int access;

	final MethodVisitor mv;

	/**
	 * Argument types of the method visited by this adapter.
	 */
	final Type[] argumentTypes;

	NormalMethodAdapter(MethodVisitor mv, String desc, int access) {
		this.mv = mv;
		this.desc = desc;
		this.access = access;
		argumentTypes = Type.getArgumentTypes(this.desc);
	}

	abstract void visitCode();

	/**
	 * Generates the instructions to load all the method arguments on the stack.
	 */
	void loadArgs() {
		loadArgs(0, argumentTypes.length);
	}

	void loadArgs(final int arg, final int count) {
		int index = 1;
		for (int i = 0; i < count; ++i) {
			Type t = argumentTypes[arg + i];
			loadInsn(t, index);
			index += t.getSize();
		}
	}

	/**
	 * Generates the instruction to push a local variable on the stack.
	 * 
	 * @param type the type of the local variable to be loaded.
	 * @param index an index in the frame's local variables array.
	 */
	void loadInsn(final Type type, final int index) {
		mv.visitVarInsn(type.getOpcode(Opcodes.ILOAD), index);
	}

}