libgluegen2-build-java 2.0-rc3-6 / usr / share / gluegen2 / src / java / com / jogamp / gluegen / procaddress / ProcAddressJavaMethodBindingEmitter.java

/*
 * Copyright (c) 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
 * 
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 * modification, are permitted provided that the following conditions are
 * met:
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 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
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 * - Redistribution in binary form must reproduce the above copyright
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 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
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 * You acknowledge that this software is not designed or intended for use
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 */
package com.jogamp.gluegen.procaddress;

import com.jogamp.gluegen.MethodBinding;
import com.jogamp.gluegen.FunctionEmitter;
import com.jogamp.gluegen.JavaMethodBindingEmitter;
import java.io.*;
import com.jogamp.gluegen.*;

/** A specialization of JavaMethodBindingEmitter with knowledge of how
to call through a function pointer. */
public class ProcAddressJavaMethodBindingEmitter extends JavaMethodBindingEmitter {

    protected boolean callThroughProcAddress;
    protected boolean changeNameAndArguments;
    
    protected String getProcAddressTableExpr;
    protected ProcAddressEmitter emitter;

    public ProcAddressJavaMethodBindingEmitter(JavaMethodBindingEmitter methodToWrap, boolean callThroughProcAddress,
            String getProcAddressTableExpr, boolean changeNameAndArguments, ProcAddressEmitter emitter) {

        super(methodToWrap);

        this.callThroughProcAddress = callThroughProcAddress;
        this.getProcAddressTableExpr = getProcAddressTableExpr;
        this.changeNameAndArguments = changeNameAndArguments;
        this.emitter = emitter;

        if (callThroughProcAddress) {
            setCommentEmitter(new WrappedMethodCommentEmitter());
        }

        if (methodToWrap.getBinding().hasContainingType()) {
            throw new IllegalArgumentException(
                    "Cannot create proc. address wrapper; method has containing type: \""
                    + methodToWrap.getBinding() + "\"");
        }
    }

    public ProcAddressJavaMethodBindingEmitter(ProcAddressJavaMethodBindingEmitter methodToWrap) {
        this(methodToWrap, methodToWrap.callThroughProcAddress, methodToWrap.getProcAddressTableExpr,
                methodToWrap.changeNameAndArguments, methodToWrap.emitter);
    }

    @Override
    public String getName() {
        String res = super.getName();
        if (changeNameAndArguments) {
            return ProcAddressEmitter.WRAP_PREFIX + res;
        }
        return res;
    }

    @Override
    protected int emitArguments(PrintWriter writer) {
        int numEmitted = super.emitArguments(writer);
        if (callThroughProcAddress) {
            if (changeNameAndArguments) {
                if (numEmitted > 0) {
                    writer.print(", ");
                }

                writer.print("long procAddress");
                ++numEmitted;
            }
        }

        return numEmitted;
    }

    @Override
    protected String getImplMethodName() {
        String name = super.getImplMethodName();
        if (callThroughProcAddress) {
            return ProcAddressEmitter.WRAP_PREFIX + name;
        }
        return name;
    }

    @Override
    protected void emitPreCallSetup(MethodBinding binding, PrintWriter writer) {
        super.emitPreCallSetup(binding, writer);

        if (callThroughProcAddress) {
            String procAddressVariable = ProcAddressEmitter.PROCADDRESS_VAR_PREFIX + binding.getName();
            writer.println("    final long __addr_ = " + getProcAddressTableExpr + "." + procAddressVariable + ";");
            writer.println("    if (__addr_ == 0) {");
            writer.println("      throw new " + emitter.unsupportedExceptionType() + "(\"Method \\\"" + binding.getName() + "\\\" not available\");");
            writer.println("    }");
        }
    }

    @Override
    protected int emitCallArguments(MethodBinding binding, PrintWriter writer) {
        int numEmitted = super.emitCallArguments(binding, writer);
        if (callThroughProcAddress) {
            if (numEmitted > 0) {
                writer.print(", ");
            }
            writer.print("__addr_");
            ++numEmitted;
        }

        return numEmitted;
    }

    /** This class emits the comment for the wrapper method */
    public class WrappedMethodCommentEmitter extends JavaMethodBindingEmitter.DefaultCommentEmitter {

        @Override
        protected void emitBeginning(FunctionEmitter methodEmitter, PrintWriter writer) {
            writer.print("Entry point (through function pointer) to C language function: <br> ");
        }
    }
}