Method gatherVars

src/main/java/matcher/type/MethodInstance.java:125–181

(MethodInstance method, MethodNode asmNode)

	}

	private static MethodVarInstance[] gatherVars(MethodInstance method, MethodNode asmNode) {
		if (asmNode == null) return emptyVars;
		if (asmNode.localVariables == null) return emptyVars; // TODO: generate?
		if (asmNode.localVariables.isEmpty()) return emptyVars;

		InsnList il = asmNode.instructions;
		AbstractInsnNode firstInsn = il.getFirst();
		List<LocalVariableNode> vars = new ArrayList<>();

		lvLoop: for (int i = 0; i < asmNode.localVariables.size(); i++) {
			LocalVariableNode var = asmNode.localVariables.get(i);

			if (var.start == firstInsn) { // check if it's an arg
				if (var.index == 0 && !method.isStatic) continue;

				for (MethodVarInstance arg : method.args) {
					if (arg.asmIndex == i) { // var is an arg
						continue lvLoop;
					}
				}
			}

			vars.add(var);
		}

		if (vars.isEmpty()) return emptyVars;

		// stable sort by start bci
		Collections.sort(vars, Comparator.comparingInt(var -> il.indexOf(var.start))); // Collections.sort is specified as stable, List.sort isn't (only implNote in OpenJDK 8)

		MethodVarInstance[] ret = new MethodVarInstance[vars.size()];

		for (int i = 0; i < vars.size(); i++) {
			LocalVariableNode var = vars.get(i);

			assert var.name != null;
			assert method.args.length == 0 || var.index > method.args[method.args.length - 1].lvIndex;

			int startInsn = il.indexOf(var.start);
			int endInsn = il.indexOf(var.end);
			assert startInsn >= 0 && endInsn >= 0;

			AbstractInsnNode start = var.start;
			int startOpIdx = 0;

			while ((start = start.getPrevious()) != null) {
				if (start.getOpcode() >= 0) startOpIdx++;
			}

			ret[i] = new MethodVarInstance(method, false, i, var.index, asmNode.localVariables.indexOf(var),
					method.getEnv().getCreateClassInstance(var.desc), startInsn, endInsn, startOpIdx,
					var.name,
					var.name == null || method.nameObfuscatedLocal || method.cls.nameObfuscated || !Util.isValidJavaIdentifier(var.name));
		}

		return ret;
	}