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 * Copyright (c) 2020, 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
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package com.oracle.truffle.llvm.runtime.nodes.api;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.llvm.runtime.except.LLVMException;
import com.oracle.truffle.llvm.runtime.memory.LLVMAllocateNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMLazyExceptionFactory.LazyExceptionExpressionNodeGen;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMLazyExceptionFactory.LazyExceptionStatementNodeGen;

Factories for helper nodes that lazily throw exceptions at runtime. These nodes can be used by
the parser for recording parser errors that should only fail lazily when the code containing the
error is executed.
/**
 * Factories for helper nodes that lazily throw exceptions at runtime. These nodes can be used by
 * the parser for recording parser errors that should only fail lazily when the code containing the
 * error is executed.
 */
public abstract class LLVMLazyException {

    @FunctionalInterface
    public interface LLVMExceptionFactory<E extends Throwable> {

        LLVMException create(Node node, E ex);
    }

    public static <E extends Throwable> LLVMAllocateNode createAllocateNode(LLVMExceptionFactory<E> factory, E cause) {
        return LazyExceptionExpressionNodeGen.create(new ExceptionThrower<>(factory, cause));
    }

    public static <E extends Throwable> LLVMExpressionNode createExpressionNode(LLVMExceptionFactory<E> factory, E cause) {
        return LazyExceptionExpressionNodeGen.create(new ExceptionThrower<>(factory, cause));
    }

    public static <E extends Throwable> LLVMStatementNode createStatementNode(LLVMExceptionFactory<E> factory, E cause) {
        return LazyExceptionStatementNodeGen.create(new ExceptionThrower<>(factory, cause));
    }

    static class ExceptionThrower<E extends Throwable> {

        private final LLVMExceptionFactory<E> factory;
        private final E cause;

        ExceptionThrower(LLVMExceptionFactory<E> factory, E cause) {
            this.factory = factory;
            this.cause = cause;
        }

        LLVMException doThrow(Node node) {
            CompilerDirectives.transferToInterpreter();
            throw factory.create(node, cause);
        }
    }

    abstract static class LazyExceptionExpressionNode extends LLVMExpressionNode implements LLVMAllocateNode {

        private final ExceptionThrower<?> thrower;

        LazyExceptionExpressionNode(ExceptionThrower<?> thrower) {
            this.thrower = thrower;
        }

        @Specialization
        Object doThrow() {
            throw thrower.doThrow(this);
        }
    }

    abstract static class LazyExceptionStatementNode extends LLVMStatementNode {

        private final ExceptionThrower<?> thrower;

        LazyExceptionStatementNode(ExceptionThrower<?> thrower) {
            this.thrower = thrower;
        }

        @Specialization
        void doThrow() {
            throw thrower.doThrow(this);
        }
    }
}