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package com.github.rapidark.framework.thirdparty.asm;

public class Label {
	public Object info;
	Frame frame;
	Label successor;
	Label next;
	static final int DEBUG = 1;
	static final int RESOLVED = 2;
	static final int RESIZED = 4;
	static final int PUSHED = 8;
	static final int TARGET = 16;
	static final int STORE = 32;
	static final int REACHABLE = 64;
	static final int JSR = 128;
	static final int RET = 256;
	static final int SUBROUTINE = 512;
	static final int VISITED = 1024;
	static final int VISITED2 = 2048;
	int status;
	int line;
	int position;
	private int referenceCount;
	private int[] srcAndRefPositions;
	int inputStackTop;
	int outputStackMax;
	Edge successors;

	public int getOffset() {
		if ((this.status & 0x2) == 0) {
			throw new IllegalStateException("Label offset position has not been resolved yet");
		}
		return this.position;
	}

	void put(MethodWriter owner, ByteVector out, int source, boolean wideOffset) {
		if ((this.status & 0x2) == 0) {
			if (wideOffset) {
				addReference(-1 - source, out.length);
				out.putInt(-1);
			} else {
				addReference(source, out.length);
				out.putShort(-1);
			}
		} else if (wideOffset) {
			out.putInt(this.position - source);
		} else {
			out.putShort(this.position - source);
		}
	}

	private void addReference(int sourcePosition, int referencePosition) {
		if (this.srcAndRefPositions == null) {
			this.srcAndRefPositions = new int[6];
		}
		if (this.referenceCount >= this.srcAndRefPositions.length) {
			int[] a = new int[this.srcAndRefPositions.length + 6];
			System.arraycopy(this.srcAndRefPositions, 0, a, 0, this.srcAndRefPositions.length);
			this.srcAndRefPositions = a;
		}
		this.srcAndRefPositions[(this.referenceCount++)] = sourcePosition;
		this.srcAndRefPositions[(this.referenceCount++)] = referencePosition;
	}

	boolean resolve(MethodWriter owner, int position, byte[] data) {
		boolean needUpdate = false;
		this.status |= 0x2;
		this.position = position;
		int i = 0;
		while (i < this.referenceCount) {
			int source = this.srcAndRefPositions[(i++)];
			int reference = this.srcAndRefPositions[(i++)];
			if (source >= 0) {
				int offset = position - source;
				if ((offset < 32768) || (offset > 32767)) {
					int opcode = data[(reference - 1)] & 0xFF;
					if (opcode <= 168) {
						data[(reference - 1)] = ((byte) (opcode + 49));
					} else {
						data[(reference - 1)] = ((byte) (opcode + 20));
					}
					needUpdate = true;
				}
				data[(reference++)] = ((byte) (offset >>> 8));
				data[reference] = ((byte) offset);
			} else {
				int offset = position + source + 1;
				data[(reference++)] = ((byte) (offset >>> 24));
				data[(reference++)] = ((byte) (offset >>> 16));
				data[(reference++)] = ((byte) (offset >>> 8));
				data[reference] = ((byte) offset);
			}
		}
		return needUpdate;
	}

	Label getFirst() {
		return this.frame == null ? this : this.frame.owner;
	}

	boolean inSubroutine(long id) {
		if ((this.status & 0x400) != 0) {
			return (this.srcAndRefPositions[((int) (id >>> 32))] & (int) id) != 0;
		}
		return false;
	}

	boolean inSameSubroutine(Label block) {
		if (((this.status & 0x400) == 0) || ((block.status & 0x400) == 0)) {
			return false;
		}
		for (int i = 0; i < this.srcAndRefPositions.length; i++) {
			if ((this.srcAndRefPositions[i] & block.srcAndRefPositions[i]) != 0) {
				return true;
			}
		}
		return false;
	}

	void addToSubroutine(long id, int nbSubroutines) {
		if ((this.status & 0x400) == 0) {
			this.status |= 0x400;
			this.srcAndRefPositions = new int[(nbSubroutines - 1) / 32 + 1];
		}
		this.srcAndRefPositions[((int) (id >>> 32))] |= (int) id;
	}

	void visitSubroutine(Label JSR, long id, int nbSubroutines) {
		Label stack = this;
		while (stack != null) {
			Label l = stack;
			stack = l.next;
			l.next = null;
			if (JSR != null) {
				if ((l.status & 0x800) != 0) {
					continue;
				}
				l.status |= 0x800;
				if (((l.status & 0x100) != 0) && (!l.inSameSubroutine(JSR))) {
					Edge e = new Edge();
					e.info = l.inputStackTop;
					e.successor = JSR.successors.successor;
					e.next = l.successors;
					l.successors = e;
				}
			} else {
				if (l.inSubroutine(id)) {
					continue;
				}
				l.addToSubroutine(id, nbSubroutines);
			}
			Edge e = l.successors;
			while (e != null) {
				if (((l.status & 0x80) == 0) || (e != l.successors.next)) {
					if (e.successor.next == null) {
						e.successor.next = stack;
						stack = e.successor;
					}
				}
				e = e.next;
			}
		}
	}

	public String toString() {
		return "L" + System.identityHashCode(this);
	}
}