com.redhat.ceylon.compiler.java.codegen.TreeValidator Maven / Gradle / Ivy

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package com.redhat.ceylon.compiler.java.codegen;

import java.util.IdentityHashMap;

import com.redhat.ceylon.langtools.tools.javac.tree.JCTree;

public class TreeValidator extends com.redhat.ceylon.langtools.tools.javac.tree.TreeScanner {

    IdentityHashMap trees = new IdentityHashMap();

    protected void check(JCTree node) {
        if (trees.containsKey(node)) {
            new RuntimeException("not a tree! " + node + " occurs twice").printStackTrace();;
        }
        trees.put(node, null);
    }
    public void scan(JCTree tree) {
        if(tree!=null) check(tree);
        super.scan(tree);
    }
    public void visitTopLevel(JCTree.JCCompilationUnit tree) {
        super.visitTopLevel(tree);
    }

    
}