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package com.oracle.truffle.llvm.runtime.nodes.asm;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.llvm.runtime.nodes.asm.support.LLVMAMD64WriteTupelNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMStatementNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMTypesGen;
import com.oracle.truffle.llvm.runtime.nodes.asm.LLVMAMD64RdtscNodeGen.LLVMAMD64RdtscReadNodeGen;

public abstract class LLVMAMD64RdtscNode extends LLVMStatementNode {
    @Child private LLVMExpressionNode rdtsc;
    @Child private LLVMAMD64WriteTupelNode out;

    public LLVMAMD64RdtscNode(LLVMAMD64WriteTupelNode out) {
        this.out = out;
        rdtsc = LLVMAMD64RdtscReadNodeGen.create();
    }

    @Specialization
    protected void doOp(VirtualFrame frame) {
        long value = LLVMTypesGen.asLong(rdtsc.executeGeneric(frame));
        long lo = value & LLVMExpressionNode.I32_MASK;
        long hi = (value >> LLVMExpressionNode.I32_SIZE_IN_BITS) & LLVMExpressionNode.I32_MASK;
        out.execute(frame, lo, hi);
    }

    public abstract static class LLVMAMD64RdtscReadNode extends LLVMExpressionNode {
        @TruffleBoundary
        @Specialization
        protected long doRdtsc() {
            return System.currentTimeMillis();
        }
    }
}