PHPCfg\Parser::parseStmt_Label PHP Method

    protected function parseStmt_Label(Stmt\Label $node)
    {
        if (isset($this->ctx->labels[$node->name])) {
            throw new \RuntimeException("Label '{$node->name}' already defined");
        }
        $labelBlock = new Block();
        $this->block->children[] = new Jump($labelBlock, $this->mapAttributes($node));
        $labelBlock->addParent($this->block);
        if (isset($this->ctx->unresolvedGotos[$node->name])) {
            /**
             * @var Block $block
             * @var array $attributes
             */
            foreach ($this->ctx->unresolvedGotos[$node->name] as list($block, $attributes)) {
                $block->children[] = new Op\Stmt\Jump($labelBlock, $attributes);
                $labelBlock->addParent($block);
            }
            unset($this->ctx->unresolvedGotos[$node->name]);
        }
        $this->block = $this->ctx->labels[$node->name] = $labelBlock;
    }