jodd-proxetta/src/main/java/jodd/proxetta/asm/ProxettaAsmUtil.java
public static void storeMethodArgument(final MethodVisitor mv, final MethodInfo methodInfo, final int index) {
		int offset = methodInfo.getArgumentOffset(index);
		int type = methodInfo.getArgument(index).getOpcode();
		switch (type) {
			case 'V':
				break;
			case 'B':
			case 'C':
			case 'S':
			case 'I':
			case 'Z':
				mv.visitVarInsn(ISTORE, offset); break;
			case 'J':
				mv.visitVarInsn(LSTORE, offset); break;
			case 'F':
				mv.visitVarInsn(FSTORE, offset); break;
			case 'D':
				mv.visitVarInsn(DSTORE, offset); break;
			default:
				mv.visitVarInsn(ASTORE, offset);
		}
	}
public static void storeMethodArgument(final MethodVisitor mv, final MethodInfo methodInfo, final int index) {
		int offset = methodInfo.getArgumentOffset(index);
		int type = methodInfo.getArgument(index).getOpcode();
		switch (type) {
			case 'V':
				break;
			case 'B':
			case 'C':
			case 'S':
			case 'I':
			case 'Z':
				mv.visitVarInsn(ISTORE, offset); break;
			case 'J':
				mv.visitVarInsn(LSTORE, offset); break;
			case 'F':
				mv.visitVarInsn(FSTORE, offset); break;
			case 'D':
				mv.visitVarInsn(DSTORE, offset); break;
			default:
				mv.visitVarInsn(ASTORE, offset);
		}
	}
Stores one argument. Index is 1-based. No conversion occurs.