/*
 * Copyright (c) 2016, Oracle and/or its affiliates.
 *
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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 */
package com.oracle.truffle.llvm.parser;

import java.util.HashMap;
import java.util.Map;

import com.oracle.truffle.llvm.parser.model.ModelModule;
import com.oracle.truffle.llvm.parser.model.blocks.InstructionBlock;
import com.oracle.truffle.llvm.parser.model.functions.FunctionDeclaration;
import com.oracle.truffle.llvm.parser.model.functions.FunctionDefinition;
import com.oracle.truffle.llvm.parser.model.globals.GlobalAlias;
import com.oracle.truffle.llvm.parser.model.globals.GlobalConstant;
import com.oracle.truffle.llvm.parser.model.globals.GlobalVariable;
import com.oracle.truffle.llvm.parser.model.visitors.FunctionVisitor;
import com.oracle.truffle.llvm.parser.model.visitors.ModelVisitor;
import com.oracle.truffle.llvm.runtime.types.Type;

public final class LLVMLabelList {

    static LLVMLabelList generate(ModelModule model) {
        LLVMLabelListVisitor visitor = new LLVMLabelListVisitor();

        model.accept(visitor);

        return new LLVMLabelList(visitor.labels());
    }

    private final Map<String, Map<String, Integer>> labels;

    private LLVMLabelList(Map<String, Map<String, Integer>> labels) {
        this.labels = labels;
    }

    public Map<String, Integer> labels(String method) {
        return labels.get(method);
    }

    private static class LLVMLabelListVisitor implements ModelVisitor {

        private final Map<String, Map<String, Integer>> labels = new HashMap<>();

        LLVMLabelListVisitor() {
        }

        private Map<String, Map<String, Integer>> labels() {
            return labels;
        }

        @Override
        public void visit(GlobalAlias alias) {
        }

        @Override
        public void visit(GlobalConstant constant) {
        }

        @Override
        public void visit(GlobalVariable variable) {
        }

        @Override
        public void visit(FunctionDeclaration method) {
        }

        @Override
        public void visit(FunctionDefinition method) {
            String name = method.getName();

            LLVMLabelListFunctionVisitor visitor = new LLVMLabelListFunctionVisitor();

            method.accept(visitor);

            labels.put(name, visitor.labels());
        }

        @Override
        public void visit(Type type) {
        }
    }

    private static class LLVMLabelListFunctionVisitor implements FunctionVisitor {

        private final Map<String, Integer> labels = new HashMap<>();

        private int index = 0;

        LLVMLabelListFunctionVisitor() {
        }

        private Map<String, Integer> labels() {
            return labels;
        }

        @Override
        public void visit(InstructionBlock block) {
            String name = block.getName();
            if (name.isEmpty() || "entry".equals(name)) {
                name = "%0";
            }
            labels.put(name, index++);
        }
    }
}