/*
 * Copyright (c) 2016, Oracle and/or its affiliates.
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 * 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
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package com.oracle.truffle.llvm.nodes.func;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.llvm.runtime.LLVMAddress;
import com.oracle.truffle.llvm.runtime.memory.LLVMNativeFunctions;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.types.FunctionType;
import com.oracle.truffle.llvm.runtime.types.Type;
import com.oracle.truffle.llvm.runtime.types.VoidType;

public final class LLVMFreeExceptionNode extends LLVMExpressionNode {

    @Child private LLVMExpressionNode exceptionPointer;
    @Child private LLVMNativeFunctions.SulongFreeExceptionNode freeException;
    @Child private LLVMLookupDispatchNode destructorDispatch;

    public LLVMFreeExceptionNode(LLVMExpressionNode exceptionPointer) {
        this.exceptionPointer = exceptionPointer;
        this.destructorDispatch = LLVMLookupDispatchNodeGen.create(new FunctionType(VoidType.INSTANCE, new Type[]{}, false));
    }

    public LLVMNativeFunctions.SulongFreeExceptionNode getFreeException() {
        if (freeException == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            this.freeException = insert(getContext().getNativeFunctions().createFreeException());
        }
        return freeException;
    }

    @Override
    public Object executeGeneric(VirtualFrame frame) {
        try {
            LLVMAddress ptr = exceptionPointer.executeLLVMAddress(frame);
            getFreeException().free(ptr);
            return null;
        } catch (UnexpectedResultException e) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            throw new IllegalStateException(e);
        }
    }

}