com.jogamp.gluegen.procaddress.ProcAddressCMethodBindingEmitter Maven / Gradle / Ivy

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 * Copyright (c) 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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 * This software is provided "AS IS," without a warranty of any kind. ALL
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 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
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package com.jogamp.gluegen.procaddress;

import com.jogamp.gluegen.CMethodBindingEmitter;
import com.jogamp.gluegen.MethodBinding;
import com.jogamp.gluegen.JavaType;
import java.io.*;
import com.jogamp.gluegen.cgram.types.*;

public class ProcAddressCMethodBindingEmitter extends CMethodBindingEmitter {

  private boolean callThroughProcAddress;
  private boolean needsLocalTypedef;

  private String localTypedefCallingConvention;

  private static final String procAddressJavaTypeName = JavaType.createForClass(Long.TYPE).jniTypeName();
  private ProcAddressEmitter emitter;

  public ProcAddressCMethodBindingEmitter(final CMethodBindingEmitter methodToWrap, final boolean callThroughProcAddress,
                          final boolean needsLocalTypedef, final String localTypedefCallingConvention, final ProcAddressEmitter emitter) {

        super(
                new MethodBinding(methodToWrap.getBinding()) {
                    @Override
                    public String getName() {
                        if (callThroughProcAddress) {
                            return ProcAddressEmitter.WRAP_PREFIX + super.getName();
                        } else {
                            return super.getName();
                        }
                    }
                },
                methodToWrap.getDefaultOutput(),
                methodToWrap.getJavaPackageName(),
                methodToWrap.getJavaClassName(),
                methodToWrap.getIsOverloadedBinding(),
                methodToWrap.getIsJavaMethodStatic(),
                true,
                methodToWrap.forIndirectBufferAndArrayImplementation(),
                methodToWrap.getMachineDescription()
        );

        if (methodToWrap.getReturnValueCapacityExpression() != null) {
            setReturnValueCapacityExpression(methodToWrap.getReturnValueCapacityExpression());
        }
        if (methodToWrap.getReturnValueLengthExpression() != null) {
            setReturnValueLengthExpression(methodToWrap.getReturnValueLengthExpression());
        }
        setTemporaryCVariableDeclarations(methodToWrap.getTemporaryCVariableDeclarations());
        setTemporaryCVariableAssignments(methodToWrap.getTemporaryCVariableAssignments());

        setCommentEmitter(defaultCommentEmitter);

        this.callThroughProcAddress = callThroughProcAddress;
        this.needsLocalTypedef = needsLocalTypedef;
        this.localTypedefCallingConvention = localTypedefCallingConvention;
        this.emitter = emitter;
    }

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

        return numEmitted;
    }

    @Override
    protected void emitBodyVariableDeclarations(final PrintWriter writer) {
        if (callThroughProcAddress) {
            // create variable for the function pointer with the right type, and set
            // it to the value of the passed-in proc address
            final FunctionSymbol cSym = getBinding().getCSymbol();
            String funcPointerTypedefName =
                    emitter.getFunctionPointerTypedefName(cSym);

            if (needsLocalTypedef) {
                // We (probably) didn't get a typedef for this function
                // pointer type in the header file; the user requested that we
                // forcibly generate one. Here we force the emission of one.
                final PointerType funcPtrType = new PointerType(null, cSym.getType(), 0);
                // Just for safety, emit this name slightly differently than
                // the mangling would otherwise produce
                funcPointerTypedefName = "_local_" + funcPointerTypedefName;

                writer.print("  typedef ");
                writer.print(funcPtrType.toString(funcPointerTypedefName, localTypedefCallingConvention));
                writer.println(";");
            }

            writer.print("  ");
            writer.print(funcPointerTypedefName);
            writer.print(" ptr_");
            writer.print(cSym.getName());
            writer.println(";");
        }

        super.emitBodyVariableDeclarations(writer);
    }

    @Override
    protected void emitBodyVariablePreCallSetup(final PrintWriter writer) {
        super.emitBodyVariablePreCallSetup(writer);

        if (callThroughProcAddress) {
            // set the function pointer to the value of the passed-in procAddress
            final FunctionSymbol cSym = getBinding().getCSymbol();
            String funcPointerTypedefName = emitter.getFunctionPointerTypedefName(cSym);
            if (needsLocalTypedef) {
                funcPointerTypedefName = "_local_" + funcPointerTypedefName;
            }

            final String ptrVarName = "ptr_" + cSym.getName();

            writer.print("  ");
            writer.print(ptrVarName);
            writer.print(" = (");
            writer.print(funcPointerTypedefName);
            writer.println(") (intptr_t) procAddress;");

            writer.println("  assert(" + ptrVarName + " != NULL);");
        }
    }

    @Override
    protected void emitBodyCallCFunction(final PrintWriter writer) {
        if (!callThroughProcAddress) {
            super.emitBodyCallCFunction(writer);
        } else {
            // Make the call to the actual C function
            writer.print("  ");

            // WARNING: this code assumes that the return type has already been
            // typedef-resolved.
            final Type cReturnType = binding.getCReturnType();

            if (!cReturnType.isVoid()) {
                writer.print("_res = ");
            }
            final MethodBinding mBinding = getBinding();
            if (mBinding.hasContainingType()) {
                // FIXME: this can and should be handled and unified with the
                // associated code in the CMethodBindingEmitter
                throw new IllegalStateException("Cannot call through function pointer because binding has containing type: " + mBinding);
            }

            // call throught the run-time function pointer
            writer.print("(* ptr_");
            writer.print(mBinding.getCSymbol().getName());
            writer.print(") ");
            writer.print("(");
            emitBodyPassCArguments(writer);
            writer.println(");");
        }
    }

    @Override
    protected String jniMangle(final MethodBinding binding) {
        final StringBuilder buf = new StringBuilder(super.jniMangle(binding));
        if (callThroughProcAddress) {
            jniMangle(Long.TYPE, buf, false);  // to account for the additional _addr_ parameter
        }
        return buf.toString();
    }
}