/*
 * Copyright (c) 2016, Oracle and/or its affiliates.
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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:
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 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
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 * 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.
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 * 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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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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package com.oracle.truffle.llvm.nodes.intrinsics.c;

import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.java.JavaInterop;
import com.oracle.truffle.llvm.nodes.intrinsics.llvm.LLVMIntrinsic;
import com.oracle.truffle.llvm.runtime.LLVMAddress;
import com.oracle.truffle.llvm.runtime.global.LLVMGlobalVariable;
import com.oracle.truffle.llvm.runtime.memory.LLVMMemory;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;

@NodeChild(type = LLVMExpressionNode.class)
public abstract class LLVMTruffleReadBytes extends LLVMIntrinsic {

    @Specialization
    public Object executeIntrinsic(LLVMGlobalVariable value) {
        return executeIntrinsic(value.getNativeLocation());
    }

    @Specialization
    public Object executeIntrinsic(LLVMAddress value) {
        byte c;
        long ptr = value.getVal();
        int count = 0;
        while ((c = LLVMMemory.getI8(ptr)) != 0) {
            count++;
            ptr += Byte.BYTES;
        }
        byte[] bytes = new byte[count];
        count = 0;
        ptr = value.getVal();
        while ((c = LLVMMemory.getI8(ptr)) != 0) {
            bytes[count++] = c;
            ptr += Byte.BYTES;
        }
        return JavaInterop.asTruffleObject(bytes);
    }

}