Method getStackDemand

src/main/java/matcher/type/Analysis.java:2131–2383

(AbstractInsnNode ain, Frame<?> frame)

	}

	private static int getStackDemand(AbstractInsnNode ain, Frame<?> frame) {
		switch (ain.getType()) {
		case AbstractInsnNode.INSN:
			switch (ain.getOpcode()) {
			case Opcodes.NOP:
				return 0;
			case Opcodes.ACONST_NULL:
			case Opcodes.ICONST_M1:
			case Opcodes.ICONST_0:
			case Opcodes.ICONST_1:
			case Opcodes.ICONST_2:
			case Opcodes.ICONST_3:
			case Opcodes.ICONST_4:
			case Opcodes.ICONST_5:
			case Opcodes.LCONST_0:
			case Opcodes.LCONST_1:
			case Opcodes.FCONST_0:
			case Opcodes.FCONST_1:
			case Opcodes.FCONST_2:
			case Opcodes.DCONST_0:
			case Opcodes.DCONST_1:
				return 0; // +1
			case Opcodes.IALOAD:
			case Opcodes.LALOAD:
			case Opcodes.FALOAD:
			case Opcodes.DALOAD:
			case Opcodes.AALOAD:
			case Opcodes.BALOAD:
			case Opcodes.CALOAD:
			case Opcodes.SALOAD:
				return 2; // +2
			case Opcodes.IASTORE:
			case Opcodes.LASTORE:
			case Opcodes.FASTORE:
			case Opcodes.DASTORE:
			case Opcodes.AASTORE:
			case Opcodes.BASTORE:
			case Opcodes.CASTORE:
			case Opcodes.SASTORE:
				return 3;
			case Opcodes.POP:
				return 1;
			case Opcodes.POP2:
				return frame.getStack(frame.getStackSize() - 1).getSize() == 1 ? 2 : 1;
			case Opcodes.DUP:
				return 1; // +2
			case Opcodes.DUP_X1:
				return 2; // +3
			case Opcodes.DUP_X2:
				return frame.getStack(frame.getStackSize() - 2).getSize() == 1 ? 3 : 2; // +4/3
			case Opcodes.DUP2:
				return frame.getStack(frame.getStackSize() - 1).getSize() == 1 ? 2 : 1; // +4/2
			case Opcodes.DUP2_X1:
				return frame.getStack(frame.getStackSize() - 1).getSize() == 1 ? 3 : 2; // +5/3
			case Opcodes.DUP2_X2:
				if (frame.getStack(frame.getStackSize() - 1).getSize() == 1) {
					if (frame.getStack(frame.getStackSize() - 3).getSize() == 1) { // 4 single slots
						return 4; // +6