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/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution 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.
*
* 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
* MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package net.java.games.gluegen;
import java.io.*;
import java.util.*;
import java.text.MessageFormat;
import net.java.games.gluegen.cgram.types.*;
/** Emits the Java-side component of the Java<->C JNI binding. */
public class JavaMethodBindingImplEmitter extends JavaMethodBindingEmitter
{
private boolean isUnimplemented;
public JavaMethodBindingImplEmitter(MethodBinding binding, PrintWriter output, String runtimeExceptionType)
{
this(binding, output, runtimeExceptionType, false);
}
public JavaMethodBindingImplEmitter(MethodBinding binding,
PrintWriter output,
String runtimeExceptionType,
boolean isUnimplemented)
{
super(binding, output, runtimeExceptionType);
setCommentEmitter(defaultJavaCommentEmitter);
this.isUnimplemented = isUnimplemented;
}
protected void emitBody(PrintWriter writer)
{
MethodBinding binding = getBinding();
if (needsBody()) {
writer.println();
writer.println(" {");
if (isUnimplemented) {
writer.println(" throw new " + getRuntimeExceptionType() + "(\"Unimplemented\");");
} else {
emitPreCallSetup(binding, writer);
emitReturnVariableSetup(binding, writer);
emitCall(binding, writer);
}
writer.println(" }");
} else {
writer.println(";");
}
}
protected boolean needsBody() {
return isUnimplemented || getBinding().needsBody() || getBinding().hasContainingType();
}
protected void emitPreCallSetup(MethodBinding binding, PrintWriter writer) {
emitArrayLengthChecks(binding, writer);
}
protected void emitArrayLengthChecks(MethodBinding binding, PrintWriter writer) {
// Check lengths of any incoming arrays if necessary
for (int i = 0; i < binding.getNumArguments(); i++) {
Type type = binding.getCArgumentType(i);
if (type.isArray()) {
ArrayType arrayType = type.asArray();
writer.println(" if (" + binding.getArgumentName(i) + ".length < " + arrayType.getLength() + ")");
writer.println(" throw new " + getRuntimeExceptionType() + "(\"Length of array \\\"" + binding.getArgumentName(i) +
"\\\" was less than the required " + arrayType.getLength() + "\");");
}
}
}
protected void emitReturnVariableSetup(MethodBinding binding, PrintWriter writer) {
writer.print(" ");
JavaType returnType = binding.getJavaReturnType();
if (!returnType.isVoid()) {
if (returnType.isCompoundTypeWrapper() ||
returnType.isNIOByteBuffer()) {
writer.println("ByteBuffer _res;");
writer.print(" _res = ");
} else {
writer.print("return ");
}
}
}
protected void emitCall(MethodBinding binding, PrintWriter writer) {
writer.print(getImplMethodName());
writer.print("(");
emitCallArguments(binding, writer);
writer.print(")");
emitCallResultReturn(binding, writer);
}
protected int emitCallArguments(MethodBinding binding, PrintWriter writer) {
boolean needComma = false;
int numArgsEmitted = 0;
if (binding.hasContainingType()) {
// Emit this pointer
assert(binding.getContainingType().isCompoundTypeWrapper());
writer.print("getBuffer()");
needComma = true;
++numArgsEmitted;
}
for (int i = 0; i < binding.getNumArguments(); i++) {
JavaType type = binding.getJavaArgumentType(i);
if (type.isJNIEnv() || binding.isArgumentThisPointer(i)) {
// Don't need to expose these at the Java level
continue;
}
if (type.isVoid()) {
// Make sure this is the only param to the method; if it isn't,
// there's something wrong with our parsing of the headers.
assert(binding.getNumArguments() == 1);
continue;
}
if (needComma) {
writer.print(", ");
}
if (type.isCompoundTypeWrapper()) {
writer.print("((");
}
writer.print(binding.getArgumentName(i));
if (type.isCompoundTypeWrapper()) {
writer.print(" == null) ? null : ");
writer.print(binding.getArgumentName(i));
writer.print(".getBuffer())");
}
needComma = true;
++numArgsEmitted;
}
return numArgsEmitted;
}
protected void emitCallResultReturn(MethodBinding binding, PrintWriter writer) {
JavaType returnType = binding.getJavaReturnType();
if (returnType.isCompoundTypeWrapper()) {
writer.println(";");
String fmt = getReturnedArrayLengthExpression();
writer.println(" if (_res == null) return null;");
if (fmt == null) {
writer.print(" return new " + returnType.getName() + "(_res.order(ByteOrder.nativeOrder()))");
} else {
writer.println(" _res.order(ByteOrder.nativeOrder());");
String[] argumentNames = new String[binding.getNumArguments()];
for (int i = 0; i < binding.getNumArguments(); i++) {
argumentNames[i] = binding.getArgumentName(i);
}
String expr = new MessageFormat(fmt).format(argumentNames);
PointerType cReturnTypePointer = binding.getCReturnType().asPointer();
CompoundType cReturnType = null;
if (cReturnTypePointer != null) {
cReturnType = cReturnTypePointer.getTargetType().asCompound();
}
if (cReturnType == null) {
throw new RuntimeException("ReturnedArrayLength directive currently only supported for pointers to compound types " +
"(error occurred while generating Java glue code for " + binding.getName() + ")");
}
writer.println(" " + getReturnTypeString(false) + " _retarray = new " + getReturnTypeString(true) + "[" + expr + "];");
writer.println(" for (int _count = 0; _count < " + expr + "; _count++) {");
// Create temporary ByteBuffer slice
// FIXME: probably need Type.getAlignedSize() for arrays of
// compound types (rounding up to machine-dependent alignment)
writer.println(" _res.position(_count * " + cReturnType.getSize() + ");");
writer.println(" _res.limit ((1 + _count) * " + cReturnType.getSize() + ");");
writer.println(" ByteBuffer _tmp = _res.slice();");
writer.println(" _tmp.order(ByteOrder.nativeOrder());");
writer.println(" _res.position(0);");
writer.println(" _res.limit(_res.capacity());");
writer.println(" _retarray[_count] = new " + returnType.getName() + "(_tmp);");
writer.println(" }");
writer.print (" return _retarray");
}
} else if (returnType.isNIOBuffer()) {
writer.println(";");
writer.println(" if (_res == null) return null;");
writer.print(" return _res.order(ByteOrder.nativeOrder())");
}
writer.println(";");
}
}
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