pvbemu/src/desktop/vue/NativeVue.java

package vue;

// Native-backed emulation core implementation
class NativeVue extends Vue {

    // Instance fields
    private long handle; // Context address in native memory



    ///////////////////////////////////////////////////////////////////////////
    //                             Constructors                              //
    ///////////////////////////////////////////////////////////////////////////

    // Default constructor
    private native long construct();
    NativeVue() {
        handle = construct();
    }



    ///////////////////////////////////////////////////////////////////////////
    //                            Public Methods                             //
    ///////////////////////////////////////////////////////////////////////////

    // Produce a new breakpoint and add it to the collection
    private native void breakpoint(long handle);
    public Breakpoint breakpoint() {
        var brk = super.breakpoint();
        breakpoint(handle);
        return brk;
    }

    // Release any used resources
    private native void dispose(long handle);
    public void dispose()
        { dispose(handle); }

    // Process the simulation
    private native int emulate(long handle, int maxCycles);
    public int emulate(int maxCycles)
        { return emulate(handle, maxCycles); }

    // Retrieve the most recent application break code
    private native int getBreakCode(long handle);
    public int getBreakCode() { return getBreakCode(handle); }

    // Retrieve the most recent exception code
    private native int getExceptionCode(long handle);
    public int getExceptionCode() {
        return getExceptionCode(handle);
    }

    // Retrieve a register value
    private native int getRegister(long handle, int index, boolean system);
    public int getRegister(int index, boolean system)
        { return getRegister(handle, index, system); }

    // Retrieve a copy of the ROM data
    private native byte[] getROM(long handle);
    public byte[] getROM() { return getROM(handle); }

    // Determine whether the context is native-backed
    public boolean isNative() {
        return true;
    }

    // Read a value from the CPU bus
    private native int read(long handle, int address, int type);
    public int read(int address, int type)
        { return read(handle, address, type); }

    // Read bytes from the CPU bus
    private native boolean readBytes(long handle, int address, byte[] dest,
        int offset, int length);
    public boolean readBytes(int address, byte[] dest, int offset, int length)
        { return readBytes(handle, address, dest, offset, length); }

    // Remove a breakpoint from the collection
    private native void remove(long handle, int index);
    public boolean remove(Breakpoint brk) {
        int index = breakpoints.indexOf(brk);
        if (!super.remove(brk))
            return false;
        remove(handle, index);
        return true;
    }

    // Initialize all system components
    private native void reset(long handle);
    public void reset()
        { reset(handle); }

    // Specify a register value
    private native int setRegister(long handle, int index, boolean system,
        int value);
    public int setRegister(int index, boolean system, int value)
        { return setRegister(handle, index, system, value); }

    // Provide new ROM data
    private native boolean setROM(long handle, byte[] data, int offset,
        int length);
    public boolean setROM(byte[] data, int offset, int length)
        { return setROM(handle, data, offset, length); }

    // Write a value to the CPU bus
    private native void write(long handle, int address, int type, int value);
    public void write(int address, int type, int value)
        { write(handle, address, type, value); }

    // Write bytes to the CPU bus
    private native boolean writeBytes(long handle, int address, byte[] src,
        int offset, int length);
    public boolean writeBytes(int address, byte[] src, int offset, int length)
        { return writeBytes(handle, address, src, offset, length); }



    ///////////////////////////////////////////////////////////////////////////
    //                            Package Methods                            //
    ///////////////////////////////////////////////////////////////////////////

    // Retrieve the current state's breakpoint scenario
    private native int getBreakType(long handle);
    int getBreakType() {
        return getBreakType(handle);
    }

    // Retrieve the current instruction fetch index
    private native int getFetch(long handle);
    int getFetch() {
        return getFetch(handle);
    }

    // A breakpoint's address ranges have changed
    private native void updateRanges(long handle, int index, int[] ranges);
    void updateRanges(Breakpoint brk) {
        super.updateRanges(brk);
        int index = breakpoints.indexOf(brk);
        if (index >= 0)
            updateRanges(handle, index, brk.flattenRanges());
    }

    // A breakpoint's enabled/hook state has changed
    private native void updateState(long handle, int index, boolean enabled,
        boolean fetch, int hooks);
    void updateState(Breakpoint brk) {
        super.updateState(brk);
        int index = breakpoints.indexOf(brk);
        updateState(handle, index,
            brk.isEnabled(), brk.getFetch(), brk.getHooks());
    }

    // A breakpoint's condition tokens have changed
    private native void updateTokens(long handle, int index, int[] tokens,
        int depth, int maxDepth);
    void updateTokens(Breakpoint brk) {
        super.updateTokens(brk);
        int index = breakpoints.indexOf(brk);
        if (index < 0)
            return;
        int maxDepth = 0;
        for (var bre : breakpoints)
            maxDepth = Math.max(maxDepth, bre.getDepth());
        updateTokens(handle, index, brk.flattenTokens(),
            brk.getDepth(), maxDepth);
    }

}