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JNI binding generator (Android runtime)
/*
* 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
* MICROSYSTEMS, 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 com.jogamp.gluegen;
import java.util.*;
import java.io.*;
import java.text.MessageFormat;
import com.jogamp.common.os.MachineDescription;
import com.jogamp.gluegen.cgram.types.*;
import java.util.logging.Logger;
/** Emits the C-side component of the Java<->C JNI binding. */
public class CMethodBindingEmitter extends FunctionEmitter {
protected static final Logger LOG = Logger.getLogger(CMethodBindingEmitter.class.getPackage().getName());
protected static final CommentEmitter defaultCommentEmitter = new DefaultCommentEmitter();
protected static final String arrayResLength = "_array_res_length";
protected static final String arrayRes = "_array_res";
protected static final String arrayIdx = "_array_idx";
protected MethodBinding binding;
/** Name of the package in which the corresponding Java method resides.*/
private final String packageName;
/** Name of the class in which the corresponding Java method resides.*/
private final String className;
/**
* Whether or not the Java<->C JNI binding for this emitter's MethodBinding
* is overloaded.
*/
private final boolean isOverloadedBinding;
/**
* Whether or not the Java-side of the Java<->C JNI binding for this
* emitter's MethodBinding is static.
*/
private final boolean isJavaMethodStatic;
// Flags which change various aspects of glue code generation
protected boolean forImplementingMethodCall;
protected boolean forIndirectBufferAndArrayImplementation;
/**
* Optional List of Strings containing temporary C variables to declare.
*/
private List temporaryCVariableDeclarations;
/**
* Optional List of Strings containing assignments to temporary C variables
* to make after the call is completed.
*/
private List temporaryCVariableAssignments;
/**
* Capacity of the return value in the event that it is encapsulated in a
* java.nio.Buffer. Is ignored if binding.getJavaReturnType().isNIOBuffer()
* == false;
*/
private MessageFormat returnValueCapacityExpression = null;
/**
* Length of the returned array. Is ignored if
* binding.getJavaReturnType().isArray() is false.
*/
private MessageFormat returnValueLengthExpression = null;
protected static final String STRING_CHARS_PREFIX = "_strchars_";
// We need this in order to compute sizes of certain types
protected MachineDescription machDesc;
/**
* Constructs an emitter for the specified binding, and sets a default
* comment emitter that will emit the signature of the C function that is
* being bound.
*/
public CMethodBindingEmitter(final MethodBinding binding,
final PrintWriter output,
final String javaPackageName,
final String javaClassName,
final boolean isOverloadedBinding,
final boolean isJavaMethodStatic,
final boolean forImplementingMethodCall,
final boolean forIndirectBufferAndArrayImplementation,
final MachineDescription machDesc)
{
super(output, false);
assert(binding != null);
assert(javaClassName != null);
assert(javaPackageName != null);
this.binding = binding;
this.packageName = javaPackageName;
this.className = javaClassName;
this.isOverloadedBinding = isOverloadedBinding;
this.isJavaMethodStatic = isJavaMethodStatic;
this.forImplementingMethodCall = forImplementingMethodCall;
this.forIndirectBufferAndArrayImplementation = forIndirectBufferAndArrayImplementation;
this.machDesc = machDesc;
setCommentEmitter(defaultCommentEmitter);
}
public final MethodBinding getBinding() { return binding; }
@Override
public String getName() {
return binding.getName();
}
/**
* Get the expression for the capacity of the returned java.nio.Buffer.
*/
public final MessageFormat getReturnValueCapacityExpression() {
return returnValueCapacityExpression;
}
/**
* If this function returns a void* encapsulated in a
* java.nio.Buffer (or compound type wrapper), sets the expression
* for the capacity of the returned Buffer.
*
* @param expression a MessageFormat which, when applied to an array
* of type String[] that contains each of the arguments names of the
* Java-side binding, returns an expression that will (when compiled
* by a C compiler) evaluate to an integer-valued expression. The
* value of this expression is the capacity of the java.nio.Buffer
* returned from this method.
*
* @throws IllegalArgumentException if the
* binding.getJavaReturnType().isNIOBuffer() == false and
* binding.getJavaReturnType().isCompoundTypeWrapper() == false
*
*/
public final void setReturnValueCapacityExpression(final MessageFormat expression) {
returnValueCapacityExpression = expression;
if (!binding.getJavaReturnType().isNIOBuffer() &&
!binding.getJavaReturnType().isCompoundTypeWrapper()) {
throw new IllegalArgumentException(
"Cannot specify return value capacity for a method that does not " +
"return java.nio.Buffer or a compound type wrapper: \"" + binding + "\"");
}
}
/**
* Get the expression for the length of the returned array
*/
public final MessageFormat getReturnValueLengthExpression() {
return returnValueLengthExpression;
}
/**
* If this function returns an array, sets the expression for the
* length of the returned array.
*
* @param expression a MessageFormat which, when applied to an array
* of type String[] that contains each of the arguments names of the
* Java-side binding, returns an expression that will (when compiled
* by a C compiler) evaluate to an integer-valued expression. The
* value of this expression is the length of the array returned from
* this method.
*
* @throws IllegalArgumentException if the
* binding.getJavaReturnType().isNIOBuffer() == false
*
*/
public final void setReturnValueLengthExpression(final MessageFormat expression) {
returnValueLengthExpression = expression;
if (!binding.getJavaReturnType().isArray() &&
!binding.getJavaReturnType().isArrayOfCompoundTypeWrappers()) {
throw new IllegalArgumentException(
"Cannot specify return value length for a method that does not " +
"return an array: \"" + binding + "\"");
}
}
/**
* Returns the List of Strings containing declarations for temporary
* C variables to be assigned to after the underlying function call.
*/
public final List getTemporaryCVariableDeclarations() {
return temporaryCVariableDeclarations;
}
/**
* Sets up a List of Strings containing declarations for temporary C
* variables to be assigned to after the underlying function call. A
* null argument indicates that no manual declarations are to be made.
*/
public final void setTemporaryCVariableDeclarations(final List arg) {
temporaryCVariableDeclarations = arg;
}
/**
* Returns the List of Strings containing assignments for temporary
* C variables which are made after the underlying function call. A
* null argument indicates that no manual assignments are to be
* made.
*/
public final List getTemporaryCVariableAssignments() {
return temporaryCVariableAssignments;
}
/**
* Sets up a List of Strings containing assignments for temporary C
* variables which are made after the underlying function call. A
* null argument indicates that no manual assignments are to be made.
*/
public final void setTemporaryCVariableAssignments(final List arg) {
temporaryCVariableAssignments = arg;
}
/**
* Get the name of the class in which the corresponding Java method
* resides.
*/
public String getJavaPackageName() { return packageName; }
/**
* Get the name of the package in which the corresponding Java method
* resides.
*/
public String getJavaClassName() { return className; }
/**
* Is the Java<->C JNI binding for this emitter's MethodBinding one of
* several overloaded methods with the same name?
*/
public final boolean getIsOverloadedBinding() { return isOverloadedBinding; }
/**
* Is the Java side of the Java<->C JNI binding for this emitter's
* MethodBinding a static method?.
*/
public final boolean getIsJavaMethodStatic() { return isJavaMethodStatic; }
/**
* Is this CMethodBindingEmitter implementing the case of an
* indirect buffer or array being passed down to C code?
*/
public final boolean forIndirectBufferAndArrayImplementation() { return forIndirectBufferAndArrayImplementation; }
/**
* Used for certain internal type size computations
*/
public final MachineDescription getMachineDescription() { return machDesc; }
@Override
protected void emitReturnType(final PrintWriter writer) {
writer.print("JNIEXPORT ");
writer.print(binding.getJavaReturnType().jniTypeName());
writer.print(" JNICALL");
}
@Override
protected void emitName(final PrintWriter writer) {
writer.println(); // start name on new line
writer.print(JavaEmitter.getJNIMethodNamePrefix(getJavaPackageName(), getJavaClassName()));
writer.print("_");
if (isOverloadedBinding) {
writer.print(jniMangle(binding));
//System.err.println("OVERLOADED MANGLING FOR " + getName() +
// " = " + jniMangle(binding));
} else {
writer.print(JavaEmitter.jniMangle(getName()));
//System.err.println(" NORMAL MANGLING FOR " + binding.getName() +
// " = " + jniMangle(getName()));
}
}
protected String getImplSuffix() {
if (forImplementingMethodCall) {
if (forIndirectBufferAndArrayImplementation) {
return "1";
} else {
return "0";
}
}
return "";
}
@Override
protected int emitArguments(final PrintWriter writer) {
writer.print("JNIEnv *env, ");
int numEmitted = 1; // initially just the JNIEnv
if (isJavaMethodStatic && !binding.hasContainingType()) {
writer.print("jclass");
} else {
writer.print("jobject");
}
writer.print(" _unused");
++numEmitted;
if (binding.hasContainingType()) {
// "this" argument always comes down in argument 0 as direct buffer
writer.print(", jobject " + JavaMethodBindingEmitter.javaThisArgumentName());
}
for (int i = 0; i < binding.getNumArguments(); i++) {
final JavaType javaArgType = binding.getJavaArgumentType(i);
// Handle case where only param is void
if (javaArgType.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 (javaArgType.isJNIEnv() || binding.isArgumentThisPointer(i)) {
continue;
}
writer.print(", ");
writer.print(javaArgType.jniTypeName());
writer.print(" ");
writer.print(binding.getArgumentName(i));
++numEmitted;
if (javaArgType.isPrimitiveArray() ||
javaArgType.isNIOBuffer()) {
writer.print(", jint " + byteOffsetArgName(i));
if(forIndirectBufferAndArrayImplementation) {
writer.print(", jboolean " + isNIOArgName(i));
}
} else if (javaArgType.isNIOBufferArray()) {
writer.print(", jintArray " +
byteOffsetArrayArgName(i));
}
}
return numEmitted;
}
@Override
protected void emitBody(final PrintWriter writer) {
writer.println(" {");
// writer.println("printf(\" - - - - "+ getName() + getImplSuffix() +" - - - -\\n\");");
emitBodyVariableDeclarations(writer);
emitBodyUserVariableDeclarations(writer);
emitBodyVariablePreCallSetup(writer);
emitBodyCallCFunction(writer);
emitBodyUserVariableAssignments(writer);
emitBodyVariablePostCallCleanup(writer);
emitBodyReturnResult(writer);
writer.println("}");
writer.println();
}
protected void emitBodyVariableDeclarations(final PrintWriter writer) {
// Emit declarations for all pointer and String conversion variables
if (binding.hasContainingType()) {
emitPointerDeclaration(writer,
binding.getContainingType(),
binding.getContainingCType(),
CMethodBindingEmitter.cThisArgumentName(),
null);
}
boolean emittedDataCopyTemps = false;
for (int i = 0; i < binding.getNumArguments(); i++) {
final JavaType type = binding.getJavaArgumentType(i);
if (type.isJNIEnv() || binding.isArgumentThisPointer(i)) {
continue;
}
if (type.isArray() || type.isNIOBuffer() || type.isCompoundTypeWrapper() || type.isArrayOfCompoundTypeWrappers()) {
final String javaArgName = binding.getArgumentName(i);
final String convName = pointerConversionArgumentName(javaArgName);
// handle array/buffer argument types
final boolean needsDataCopy =
emitPointerDeclaration(writer,
type,
binding.getCArgumentType(i),
convName, javaArgName);
if (needsDataCopy && !emittedDataCopyTemps) {
// emit loop counter and array length variables used during data
// copy
writer.println(" jobject _tmpObj;");
writer.println(" int _copyIndex;");
writer.println(" jsize _tmpArrayLen;");
// Pointer to the data in the Buffer, taking the offset into account
if(type.isNIOBufferArray()) {
writer.println(" int * _offsetHandle = NULL;");
}
emittedDataCopyTemps = true;
}
} else if (type.isString()) {
final Type cType = binding.getCArgumentType(i);
if (isUTF8Type(cType)) {
writer.print(" const char* ");
} else {
writer.print(" jchar* ");
}
writer.print(STRING_CHARS_PREFIX);
writer.print(binding.getArgumentName(i));
writer.println(" = NULL;");
}
}
// Emit declaration for return value if necessary
final Type cReturnType = binding.getCReturnType();
final JavaType javaReturnType = binding.getJavaReturnType();
if (!cReturnType.isVoid()) {
writer.print(" ");
// Note we must respect const/volatile for return argument
writer.print(binding.getCSymbol().getReturnType().getName(true));
writer.println(" _res;");
if (javaReturnType.isNIOByteBufferArray() ||
javaReturnType.isArrayOfCompoundTypeWrappers()) {
writer.print(" int ");
writer.print(arrayResLength);
writer.println(";");
writer.print(" int ");
writer.print(arrayIdx);
writer.println(";");
writer.print(" jobjectArray ");
writer.print(arrayRes);
writer.println(";");
} else if (javaReturnType.isArray()) {
writer.print(" int ");
writer.print(arrayResLength);
writer.println(";");
final Class componentType = javaReturnType.getJavaClass().getComponentType();
if (componentType.isArray()) {
throw new RuntimeException("Multi-dimensional arrays not supported yet");
}
final String javaTypeName = componentType.getName();
final String javaArrayTypeName = "j" + javaTypeName + "Array";
writer.print(" ");
writer.print(javaArrayTypeName);
writer.print(" ");
writer.print(arrayRes);
writer.println(";");
}
}
}
/** Emits the user-defined C variable declarations from the
TemporaryCVariableDeclarations directive in the .cfg file. */
protected void emitBodyUserVariableDeclarations(final PrintWriter writer) {
if (temporaryCVariableDeclarations != null) {
for (final String val : temporaryCVariableDeclarations) {
writer.print(" ");
writer.println(val);
}
}
}
/** Checks a type to see whether it is for a UTF-8 pointer type
(i.e., "const char *", "const char **"). False implies that this
type is for a Unicode pointer type ("jchar *", "jchar **"). */
protected boolean isUTF8Type(Type type) {
final int i = 0;
// Try to dereference the type at most two levels
while (!type.isInt() && !type.isVoid() && (i < 2)) {
final PointerType pt = type.asPointer();
if (pt != null) {
type = pt.getTargetType();
} else {
final ArrayType arrt = type.asArray();
if (arrt == null) {
throw new IllegalArgumentException("Type " + type + " should have been a pointer or array type");
}
type = arrt.getElementType();
}
}
if (type.isVoid()) {
// Assume UTF-8 since UTF-16 is rare
return true;
}
if (!type.isInt()) {
throw new IllegalArgumentException("Type " + type + " should have been a one- or two-dimensional integer pointer or array type");
}
if (type.getSize(machDesc) != 1 && type.getSize(machDesc) != 2) {
throw new IllegalArgumentException("Type " + type + " should have been a one- or two-dimensional pointer to char or short");
}
return (type.getSize(machDesc) == 1);
}
/**
* Code to init the variables that were declared in
* emitBodyVariableDeclarations(), PRIOR TO calling the actual C
* function.
*/
protected void emitBodyVariablePreCallSetup(final PrintWriter writer) {
// Convert all Buffers to pointers first so we don't have to
// call ReleasePrimitiveArrayCritical for any arrays if any
// incoming buffers aren't direct
if (binding.hasContainingType()) {
emitPointerConversion(writer, binding,
binding.getContainingType(),
binding.getContainingCType(),
JavaMethodBindingEmitter.javaThisArgumentName(),
CMethodBindingEmitter.cThisArgumentName(),
null);
}
// Convert all arrays to pointers, and get UTF-8 versions of jstring args
for (int i = 0; i < binding.getNumArguments(); i++) {
final JavaType javaArgType = binding.getJavaArgumentType(i);
if (javaArgType.isJNIEnv() || binding.isArgumentThisPointer(i)) {
continue;
}
final String javaArgName = binding.getArgumentName(i);
if (javaArgType.isCompoundTypeWrapper() ||
(javaArgType.isNIOBuffer() && !forIndirectBufferAndArrayImplementation ) ) {
emitPointerConversion(writer, binding, javaArgType,
binding.getCArgumentType(i), javaArgName,
pointerConversionArgumentName(javaArgName),
byteOffsetArgName(i));
} else if (javaArgType.isArray() ||
javaArgType.isArrayOfCompoundTypeWrappers() ||
( javaArgType.isNIOBuffer() && forIndirectBufferAndArrayImplementation ) ) {
final boolean needsDataCopy = javaArgTypeNeedsDataCopy(javaArgType);
writer.println(" if ( NULL != " + javaArgName + " ) {");
final Type cArgType = binding.getCArgumentType(i);
String cArgTypeName = cArgType.getName();
final String convName = pointerConversionArgumentName(javaArgName);
if (!needsDataCopy) {
writer.print(" ");
writer.print(convName);
writer.print(" = (");
if (javaArgType.isStringArray()) {
// java-side type is String[]
cArgTypeName = "jstring *";
}
writer.print(cArgTypeName);
writer.print(") ( JNI_TRUE == " + isNIOArgName(i) + " ? ");
writer.print(" (*env)->GetDirectBufferAddress(env, " + javaArgName + ") : ");
writer.print(" (*env)->GetPrimitiveArrayCritical(env, " + javaArgName + ", NULL) );");
} else {
// Handle the case where the array elements are of a type that needs a
// data copy operation to convert from the java memory model to the C
// memory model (e.g., int[][], String[], etc)
//
// FIXME: should factor out this whole block of code into a separate
// method for clarity and maintenance purposes
//
// Note that we properly handle only the case of an array of
// compound type wrappers in emitBodyVariablePostCallCleanup below
if (!isBaseTypeConst(cArgType) &&
!javaArgType.isArrayOfCompoundTypeWrappers()) {
// FIXME: if the arg type is non-const, the sematics might be that
// the function modifies the argument -- we don't yet support
// this.
throw new RuntimeException(
"Cannot copy data for ptr-to-ptr arg type \"" + cArgType +
"\": support for non-const ptr-to-ptr types not implemented.");
}
writer.println();
writer.println(" /* Copy contents of " + javaArgName + " into " + convName + "_copy */");
// get length of array being copied
final String arrayLenName = "_tmpArrayLen";
writer.print(" ");
writer.print(arrayLenName);
writer.print(" = (*env)->GetArrayLength(env, ");
writer.print(javaArgName);
writer.println(");");
// allocate an array to hold each element
final Type cArgElementType, cArgElementType2;
{
int error = 0;
if( cArgType.isPointer() ) {
cArgElementType = cArgType.asPointer().getTargetType();
if( cArgElementType.isPointer() ) {
// pointer-to-pointer
cArgElementType2 = cArgElementType.asPointer().getTargetType();
if( cArgElementType2.isPointer() ) {
error = 1;
}
if(cArgType.pointerDepth() != 2) {
error = 2;
}
} else {
cArgElementType2 = null;
if(cArgType.pointerDepth() != 1) {
error = 10;
}
}
} else if( cArgType.isArray() ) {
cArgElementType = cArgType.asArray().getBaseElementType();
cArgElementType2 = null;
} else {
cArgElementType = null;
cArgElementType2 = null;
error = 100;
}
if( 0 < error ) {
throw new RuntimeException(
"Could not copy data for type \"" + cArgType +
"\"; currently only pointer- and array-types are supported. (error "+error+")");
}
}
emitMalloc(
writer,
convName+"_copy",
cArgElementType.getName(),
isBaseTypeConst(cArgType),
arrayLenName,
"Could not allocate buffer for copying data in argument \\\""+javaArgName+"\\\"");
// Get the handle for the byte offset array sent down for Buffers
// FIXME: not 100% sure this is correct with respect to the
// JNI spec because it may be illegal to call
// GetObjectArrayElement while in a critical section. May
// need to do another loop and add in the offsets.
if (javaArgType.isNIOBufferArray()) {
writer.println
(" _offsetHandle = (int *) (*env)->GetPrimitiveArrayCritical(env, " +
byteOffsetArrayArgName(i) +
", NULL);");
}
// process each element in the array
writer.println(" for (_copyIndex = 0; _copyIndex < "+arrayLenName+"; ++_copyIndex) {");
// get each array element
writer.println(" /* get each element of the array argument \"" + javaArgName + "\" */");
writer.print(" _tmpObj = (*env)->GetObjectArrayElement(env, ");
writer.print(javaArgName);
writer.println(", _copyIndex);");
if (javaArgType.isStringArray()) {
writer.print(" ");
emitGetStringChars(writer,
"(jstring) _tmpObj",
convName+"_copy[_copyIndex]",
isUTF8Type(cArgType),
true);
} else if (javaArgType.isNIOBufferArray()) {
/* We always assume an integer "byte offset" argument follows any Buffer
in the method binding. */
emitGetDirectBufferAddress(writer,
"_tmpObj",
cArgElementType.getName(),
convName + "_copy[_copyIndex]",
true,
"_offsetHandle[_copyIndex]", true);
} else if (javaArgType.isArrayOfCompoundTypeWrappers()) {
// These come down in similar fashion to an array of NIO
// Buffers only we do not pass down any integer byte
// offset argument
emitGetDirectBufferAddress(writer,
"_tmpObj",
cArgElementType.getName(),
"("+convName + "_copy + _copyIndex)",
false /* !receivingIsPtrPtr -> linear layout -> use memcpy */,
null, true);
} else {
if( null == cArgElementType2 ) {
throw new RuntimeException("XXX: Type "+cArgType+" not properly handled as ptr-to-ptr");
}
// Question: do we always need to copy the sub-arrays, or just
// GetPrimitiveArrayCritical on each jobjectarray element and
// assign it to the appropriate elements at pointer depth 1?
// Probably depends on const-ness of the argument.
// Malloc enough space to hold a copy of each sub-array
writer.print(" ");
emitMalloc(
writer,
convName+"_copy[_copyIndex]",
cArgElementType2.getName(), // assumes cArgPtrType is ptr-to-ptr-to-primitive !!
isBaseTypeConst(cArgType),
"(*env)->GetArrayLength(env, _tmpObj)",
"Could not allocate buffer during copying of data in argument \\\""+javaArgName+"\\\"");
// FIXME: copy the data (use matched Get/ReleasePrimitiveArrayCritical() calls)
if (true) {
throw new RuntimeException("Cannot yet handle type \"" + cArgType.getName() +
"\"; need to add support for copying ptr-to-ptr-to-primitiveType subarrays");
}
}
writer.println(" }");
if (javaArgType.isNIOBufferArray()) {
writer.println
(" (*env)->ReleasePrimitiveArrayCritical(env, " +
byteOffsetArrayArgName(i) +
", _offsetHandle, JNI_ABORT);");
}
writer.println();
} // end of data copy
writer.println(" }");
} else if (javaArgType.isString()) {
emitGetStringChars(writer, javaArgName,
STRING_CHARS_PREFIX + javaArgName,
isUTF8Type(binding.getCArgumentType(i)),
false);
}
}
}
/**
* Code to clean up any variables that were declared in
* emitBodyVariableDeclarations(), AFTER calling the actual C function.
*/
protected void emitBodyVariablePostCallCleanup(final PrintWriter writer) {
// Release primitive arrays and temporary UTF8 strings if necessary
for (int i = 0; i < binding.getNumArguments(); i++) {
final JavaType javaArgType = binding.getJavaArgumentType(i);
if (javaArgType.isJNIEnv() || binding.isArgumentThisPointer(i)) {
continue;
}
final Type cArgType = binding.getCArgumentType(i);
final String javaArgName = binding.getArgumentName(i);
if (javaArgType.isArray() ||
(javaArgType.isNIOBuffer() && forIndirectBufferAndArrayImplementation) ||
javaArgType.isArrayOfCompoundTypeWrappers()) {
final boolean needsDataCopy = javaArgTypeNeedsDataCopy(javaArgType);
final String convName = pointerConversionArgumentName(javaArgName);
if (!needsDataCopy) {
writer.println(" if ( JNI_FALSE == " + isNIOArgName(i) + " && NULL != " + javaArgName + " ) {");
// Release array
final String modeFlag = isBaseTypeConst(cArgType) ? "JNI_ABORT" : "0" ;
writer.print(" (*env)->ReleasePrimitiveArrayCritical(env, " + javaArgName + ", " + convName + ", "+modeFlag+");");
} else {
writer.println(" if ( NULL != " + javaArgName + " ) {");
// clean up the case where the array elements are of a type that needed
// a data copy operation to convert from the java memory model to the
// C memory model (e.g., int[][], String[], etc)
//
// FIXME: should factor out this whole block of code into a separate
// method for clarity and maintenance purposes
if (!isBaseTypeConst(cArgType)) {
// FIXME: handle any cleanup from treatment of non-const args,
// assuming they were treated differently in
// emitBodyVariablePreCallSetup() (see the similar section in that
// method for details).
if (javaArgType.isArrayOfCompoundTypeWrappers()) {
// This is the only form of cleanup we handle right now
writer.println(" _tmpArrayLen = (*env)->GetArrayLength(env, " + javaArgName + ");");
writer.println(" for (_copyIndex = 0; _copyIndex < _tmpArrayLen; ++_copyIndex) {");
writer.println(" _tmpObj = (*env)->GetObjectArrayElement(env, " + javaArgName + ", _copyIndex);");
emitReturnDirectBufferAddress(writer,
"_tmpObj",
cArgType.asArray().getBaseElementType().getName(),
"("+convName + "_copy + _copyIndex)",
false /* receivingIsPtrPtr */,
null);
writer.println(" }");
} else {
throw new RuntimeException(
"Cannot clean up copied data for ptr-to-ptr arg type \"" + cArgType +
"\": support for cleaning up most non-const ptr-to-ptr types not implemented.");
}
}
writer.println(" /* Clean up " + convName + "_copy */");
// Only need to perform cleanup for individual array
// elements if they are not direct buffers
if (!javaArgType.isNIOBufferArray() &&
!javaArgType.isArrayOfCompoundTypeWrappers()) {
// Re-fetch length of array that was copied
final String arrayLenName = "_tmpArrayLen";
writer.print(" ");
writer.print(arrayLenName);
writer.print(" = (*env)->GetArrayLength(env, ");
writer.print(javaArgName);
writer.println(");");
// free each element
final PointerType cArgPtrType = cArgType.asPointer();
if (cArgPtrType == null) {
throw new RuntimeException(
"Could not copy data for type \"" + cArgType +
"\"; currently only pointer types supported.");
}
// process each element in the array
writer.println(" for (_copyIndex = 0; _copyIndex < " + arrayLenName +"; ++_copyIndex) {");
// get each array element
writer.println(" /* free each element of " +convName +"_copy */");
writer.print(" _tmpObj = (*env)->GetObjectArrayElement(env, ");
writer.print(javaArgName);
writer.println(", _copyIndex);");
if (javaArgType.isStringArray()) {
writer.print(" (*env)->ReleaseStringUTFChars(env, ");
writer.print("(jstring) _tmpObj");
writer.print(", ");
writer.print(convName+"_copy[_copyIndex]");
writer.println(");");
} else {
if (true) throw new RuntimeException(
"Cannot yet handle type \"" + cArgType.getName() +
"\"; need to add support for cleaning up copied ptr-to-ptr-to-primitiveType subarrays");
}
writer.println(" }");
}
// free the main array
writer.print(" free((void*) ");
writer.print(convName+"_copy");
writer.println(");");
} // end of cleaning up copied data
writer.println(" }");
} else if (javaArgType.isString()) {
writer.println(" if ( NULL != " + javaArgName + " ) {");
if (isUTF8Type(cArgType)) {
writer.print(" (*env)->ReleaseStringUTFChars(env, ");
writer.print(javaArgName);
writer.print(", " + STRING_CHARS_PREFIX);
writer.print(javaArgName);
writer.println(");");
} else {
writer.println(" free((void*) " + STRING_CHARS_PREFIX + javaArgName + ");");
}
writer.println(" }");
}
}
}
/** Returns the number of arguments passed so calling code knows
whether to print a comma */
protected int emitBodyPassCArguments(final PrintWriter writer) {
for (int i = 0; i < binding.getNumArguments(); i++) {
if (i != 0) {
writer.print(", ");
}
final JavaType javaArgType = binding.getJavaArgumentType(i);
// Handle case where only param is void.
if (javaArgType.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 (javaArgType.isJNIEnv()) {
writer.print("env");
} else if (binding.isArgumentThisPointer(i)) {
writer.print(CMethodBindingEmitter.cThisArgumentName());
} else {
writer.print("(");
final Type cArgType = binding.getCArgumentType(i);
final boolean needsDataCopy = javaArgTypeNeedsDataCopy(javaArgType);
final boolean needsArrayOffset = !needsDataCopy && (
javaArgType.isArray() ||
javaArgType.isArrayOfCompoundTypeWrappers() ||
( javaArgType.isNIOBuffer() && forIndirectBufferAndArrayImplementation ) );
if (isBaseTypeConst(cArgType)) {
writer.print("const ");
}
// if this is a pointer to an unsigned type, add unsigned to the name to avoid compiler warnings
if(cArgType.isPointer()) {
final Type baseType = cArgType.getBaseElementType();
if(baseType.isInt() && (((IntType)baseType).isPrimitiveUnsigned())) {
writer.print("unsigned ");
}
}
writer.print(cArgType.getName());
writer.print(") ");
if (cArgType.isPointer() && javaArgType.isPrimitive()) {
writer.print("(intptr_t) ");
}
if (javaArgType.isArray() || javaArgType.isNIOBuffer() ||
javaArgType.isCompoundTypeWrapper() || javaArgType.isArrayOfCompoundTypeWrappers()) {
if( needsArrayOffset ) {
writer.print("(((char *) ");
} else if( !cArgType.isPointer() && javaArgType.isCompoundTypeWrapper() ) { // FIXME: Compound call-by-value
writer.print("*");
}
writer.print(pointerConversionArgumentName(binding.getArgumentName(i)));
if ( needsDataCopy ) {
writer.print("_copy");
}
if( needsArrayOffset ) {
writer.print(") + " + byteOffsetArgName(i) + ")");
}
} else {
if (javaArgType.isString()) { writer.print(STRING_CHARS_PREFIX); }
writer.print(binding.getArgumentName(i));
}
}
}
return binding.getNumArguments();
}
private boolean isCStructFunctionPointer = false;
/**
* If method originates from a struct, see {@link MethodBinding#hasContainingType()},
* it can either purposed to call a native static function (default)
* or a struct's function pointer.
*/
protected void setIsCStructFunctionPointer(final boolean v) {
isCStructFunctionPointer = v;
}
protected void emitBodyCallCFunction(final PrintWriter writer) {
// 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 = ");
}
if ( isCStructFunctionPointer && binding.hasContainingType() ) {
// Call through function pointer
writer.print(CMethodBindingEmitter.cThisArgumentName() + "->");
}
writer.print(binding.getCSymbol().getName());
writer.print("(");
emitBodyPassCArguments(writer);
writer.println(");");
}
/** Emits the user-defined C variable assignments from the
TemporaryCVariableAssignments directive in the .cfg file. */
protected void emitBodyUserVariableAssignments(final PrintWriter writer) {
if (temporaryCVariableAssignments != null) {
for (final String val : temporaryCVariableAssignments) {
writer.print(" ");
writer.println(val);
}
}
}
protected void emitBodyReturnResult(final PrintWriter writer)
{
// WARNING: this code assumes that the return type has already been
// typedef-resolved.
final Type cReturnType = binding.getCReturnType();
// Return result if necessary
if (!cReturnType.isVoid()) {
final JavaType javaReturnType = binding.getJavaReturnType();
if (javaReturnType.isPrimitive()) {
writer.print(" return ");
if (cReturnType.isPointer()) {
// Pointer being converted to int or long: cast this result
// (through intptr_t to avoid compiler warnings with gcc)
writer.print("(" + javaReturnType.jniTypeName() + ") (intptr_t) ");
}
writer.println("_res;");
} else if ( !cReturnType.isPointer() && javaReturnType.isCompoundTypeWrapper() ) { // FIXME: Compound call-by-value
final String returnSizeOf;
if (returnValueCapacityExpression != null) {
returnSizeOf = returnValueCapacityExpression.format(argumentNameArray());
} else {
returnSizeOf = "sizeof(" + cReturnType.getName() + ")";
}
writer.println(" return JVMUtil_NewDirectByteBufferCopy(env, &_res, "+returnSizeOf+");");
} else if (javaReturnType.isNIOBuffer() || javaReturnType.isCompoundTypeWrapper()) {
writer.println(" if (NULL == _res) return NULL;");
writer.print(" return (*env)->NewDirectByteBuffer(env, (void *)_res, ");
// See whether capacity has been specified
if (returnValueCapacityExpression != null) {
writer.print( returnValueCapacityExpression.format( argumentNameArray() ) );
} else {
if (cReturnType.isPointer() &&
cReturnType.asPointer().getTargetType().isCompound()) {
if (cReturnType.asPointer().getTargetType().getSize() == null) {
throw new RuntimeException(
"Error emitting code for compound return type "+
"for function \"" + binding + "\": " +
"Structs to be emitted should have been laid out by this point " +
"(type " + cReturnType.asPointer().getTargetType().getName() + " / " +
cReturnType.asPointer().getTargetType() + " was not) for "+binding
);
}
}
writer.print("sizeof(" + cReturnType.getName() + ")");
LOG.warning(
"No capacity specified for java.nio.Buffer return " +
"value for function \"" + binding.getName() + "\"" +
" assuming size of equivalent C return type (sizeof(" + cReturnType.getName() + ")): " + binding);
}
writer.println(");");
} else if (javaReturnType.isString()) {
writer.println(" if (NULL == _res) return NULL;");
writer.println(" return (*env)->NewStringUTF(env, _res);");
} else if (javaReturnType.isArrayOfCompoundTypeWrappers() ||
(javaReturnType.isArray() && javaReturnType.isNIOByteBufferArray())) {
writer.println(" if (NULL == _res) return NULL;");
if (returnValueLengthExpression == null) {
throw new RuntimeException("Error while generating C code: no length specified for array returned from function " +
binding);
}
writer.println(" " + arrayResLength + " = " + returnValueLengthExpression.format(argumentNameArray()) + ";");
writer.println(" " + arrayRes + " = (*env)->NewObjectArray(env, " + arrayResLength + ", (*env)->FindClass(env, \"java/nio/ByteBuffer\"), NULL);");
writer.println(" for (" + arrayIdx + " = 0; " + arrayIdx + " < " + arrayResLength + "; " + arrayIdx + "++) {");
final Type retType = binding.getCSymbol().getReturnType();
Type pointerType;
if (retType.isPointer()) {
pointerType = retType.asPointer().getTargetType();
} else {
pointerType = retType.asArray().getBaseElementType();
}
writer.println(" (*env)->SetObjectArrayElement(env, " + arrayRes + ", " + arrayIdx +
", (*env)->NewDirectByteBuffer(env, (void *)_res[" + arrayIdx + "], sizeof(" + pointerType.getName() + ")));");
writer.println(" }");
writer.println(" return " + arrayRes + ";");
} else if (javaReturnType.isArray()) {
// FIXME: must have user provide length of array in .cfg file
// by providing a constant value, input parameter, or
// expression which computes the array size (already present
// as ReturnValueCapacity, not yet implemented / tested here)
throw new RuntimeException(
"Could not emit native code for function \"" + binding +
"\": array return values for non-char types not implemented yet, for "+binding);
// FIXME: This is approximately what will be required here
//
//writer.print(" ");
//writer.print(arrayRes);
//writer.print(" = (*env)->New");
//writer.print(capitalizedComponentType);
//writer.print("Array(env, ");
//writer.print(arrayResLength);
//writer.println(");");
//writer.print(" (*env)->Set");
//writer.print(capitalizedComponentType);
//writer.print("ArrayRegion(env, ");
//writer.print(arrayRes);
//writer.print(", 0, ");
//writer.print(arrayResLength);
//writer.println(", _res);");
//writer.print(" return ");
//writer.print(arrayRes);
//writer.println(";");
} else {
System.err.print("Unhandled return type: "+javaReturnType.getDebugString());
throw new RuntimeException("Unhandled return type: "+javaReturnType.getDebugString()+" for "+binding);
}
}
}
protected static String cThisArgumentName() {
return "this0";
}
protected String jniMangle(final MethodBinding binding) {
final StringBuilder buf = new StringBuilder();
buf.append(JavaEmitter.jniMangle(getName()));
buf.append(getImplSuffix());
buf.append("__");
if (binding.hasContainingType()) {
// "this" argument always comes down in argument 0 as direct buffer
jniMangle(java.nio.ByteBuffer.class, buf, true);
}
for (int i = 0; i < binding.getNumArguments(); i++) {
if (binding.isArgumentThisPointer(i)) {
continue;
}
final JavaType type = binding.getJavaArgumentType(i);
if (type.isVoid()) {
// We should only see "void" as the first argument of a 1-argument function
// FIXME: should normalize this in the parser
if ((i != 0) || (binding.getNumArguments() > 1)) {
throw new RuntimeException("Saw illegal \"void\" argument while emitting \"" + getName() + "\"");
}
} else {
Class c = type.getJavaClass();
if (c != null) {
jniMangle(c, buf, false);
// If Buffer offset arguments were added, we need to mangle the JNI for the
// extra arguments
if (type.isNIOBuffer()) {
jniMangle(Integer.TYPE, buf, false);
if(forIndirectBufferAndArrayImplementation) {
jniMangle(Boolean.TYPE, buf, false);
}
} else if (type.isNIOBufferArray()) {
final int[] intArrayType = new int[0];
c = intArrayType.getClass();
jniMangle(c , buf, true);
}
if (type.isPrimitiveArray()) {
jniMangle(Integer.TYPE, buf, false);
}
} else if (type.isCompoundTypeWrapper()) {
// Mangle wrappers for C structs as ByteBuffer
jniMangle(java.nio.ByteBuffer.class, buf, true);
} else if (type.isArrayOfCompoundTypeWrappers()) {
// Mangle arrays of C structs as ByteBuffer[]
final java.nio.ByteBuffer[] tmp = new java.nio.ByteBuffer[0];
jniMangle(tmp.getClass(), buf, true);
} else if (type.isJNIEnv()) {
// These are not exposed at the Java level
} else {
// FIXME: add support for char* -> String conversion
throw new RuntimeException("Unknown kind of JavaType: name="+type.getName());
}
}
}
return buf.toString();
}
protected void jniMangle(final Class c, final StringBuilder res, final boolean syntheticArgument) {
if (c.isPrimitive()) {
if (c == Boolean.TYPE) res.append("Z");
else if (c == Byte.TYPE) res.append("B");
else if (c == Character.TYPE) res.append("C");
else if (c == Short.TYPE) res.append("S");
else if (c == Integer.TYPE) res.append("I");
else if (c == Long.TYPE) res.append("J");
else if (c == Float.TYPE) res.append("F");
else if (c == Double.TYPE) res.append("D");
else throw new RuntimeException("Illegal primitive type \"" + c.getName() + "\"");
} else {
// Arrays and NIO Buffers are always passed down as java.lang.Object.
// The only arrays that show up as true arrays in the signature
// are the synthetic byte offset arrays created when passing
// down arrays of direct Buffers. Compound type wrappers are
// passed down as ByteBuffers (no good reason, just to avoid
// accidental conflation) so we mangle them differently.
if (syntheticArgument) {
if (c.isArray()) {
res.append("_3");
final Class componentType = c.getComponentType();
// Handle arrays of compound type wrappers differently for
// convenience of the Java-level glue code generation
jniMangle(componentType, res,
(componentType == java.nio.ByteBuffer.class));
} else {
res.append("L");
res.append(c.getName().replace('.', '_'));
res.append("_2");
}
} else {
if (c.isArray()) {
res.append("_3");
jniMangle(c.getComponentType(), res, false);
} else if (c == java.lang.String.class) {
res.append("L");
res.append(c.getName().replace('.', '_'));
res.append("_2");
} else {
res.append("L");
res.append("java_lang_Object");
res.append("_2");
}
}
}
}
private void emitOutOfMemoryCheck(final PrintWriter writer, final String varName, final String errorMessage) {
writer.println(" if ( NULL == " + varName + " ) {");
writer.println(" (*env)->ThrowNew(env, (*env)->FindClass(env, \"java/lang/OutOfMemoryError\"),");
writer.print(" \"" + errorMessage);
writer.print(" in native dispatcher for \\\"");
writer.print(getName());
writer.println("\\\"\");");
writer.print(" return");
if (!binding.getJavaReturnType().isVoid()) {
writer.print(" 0");
}
writer.println(";");
writer.println(" }");
}
private void emitMalloc(final PrintWriter writer,
final String targetVarName,
final String elementTypeString,
final boolean elementTypeIsConst,
final String numElementsExpression,
final String mallocFailureErrorString) {
writer.print(" ");
writer.print(targetVarName);
writer.print(" = (");
if(elementTypeIsConst) {
writer.print("const ");
}
writer.print(elementTypeString);
writer.print(" *) malloc(");
writer.print(numElementsExpression);
writer.print(" * sizeof(");
writer.print(elementTypeString);
writer.println("));");
// Catch memory allocation failure
emitOutOfMemoryCheck( writer, targetVarName, mallocFailureErrorString);
}
private void emitCalloc(final PrintWriter writer,
final String targetVarName,
final String elementTypeString,
final String numElementsExpression,
final String mallocFailureErrorString) {
writer.print(" ");
writer.print(targetVarName);
writer.print(" = (");
writer.print(elementTypeString);
writer.print(" *) calloc(");
writer.print(numElementsExpression);
writer.print(", sizeof(");
writer.print(elementTypeString);
writer.println("));");
// Catch memory allocation failure
emitOutOfMemoryCheck( writer, targetVarName, mallocFailureErrorString);
}
private void emitGetStringChars(final PrintWriter writer,
final String sourceVarName,
final String receivingVarName,
final boolean isUTF8,
final boolean emitElseClause) {
writer.println(" if ( NULL != " + sourceVarName + " ) {");
if (isUTF8) {
writer.print(" ");
writer.print(receivingVarName);
writer.print(" = (*env)->GetStringUTFChars(env, ");
writer.print(sourceVarName);
writer.println(", (jboolean*)NULL);");
// Catch memory allocation failure in the event that the VM didn't pin
// the String and failed to allocate a copy
emitOutOfMemoryCheck( writer, receivingVarName, "Failed to get UTF-8 chars for argument \\\""+sourceVarName+"\\\"");
} else {
// The UTF-16 case is basically Windows specific. Unix platforms
// tend to use only the UTF-8 encoding. On Windows the problem
// is that wide character strings are expected to be null
// terminated, but the JNI GetStringChars doesn't return a
// null-terminated Unicode string. For this reason we explicitly
// calloc our buffer, including the null terminator, and use
// GetStringRegion to fetch the string's characters.
emitCalloc(writer,
receivingVarName,
"jchar",
"(*env)->GetStringLength(env, " + sourceVarName + ") + 1",
"Could not allocate temporary buffer for copying string argument \\\""+sourceVarName+"\\\"");
writer.println(" (*env)->GetStringRegion(env, " + sourceVarName + ", 0, (*env)->GetStringLength(env, " + sourceVarName + "), " + receivingVarName + ");");
}
writer.print(" }");
if (emitElseClause) {
writer.print(" else {");
writer.print(" ");
writer.print(receivingVarName);
writer.println(" = NULL;");
writer.println(" }");
} else {
writer.println();
}
}
private void emitGetDirectBufferAddress(final PrintWriter writer,
final String sourceVarName,
final String receivingVarTypeString,
final String receivingVarName,
final boolean receivingIsPtrPtr,
final String byteOffsetVarName, final boolean emitElseClause) {
writer.println(" if ( NULL != " + sourceVarName + " ) {");
writer.print(" ");
writer.print(" ");
if( receivingIsPtrPtr ) {
writer.print(receivingVarName+" = ("+receivingVarTypeString+") (((char*) (*env)->GetDirectBufferAddress(env, "+sourceVarName+"))");
writer.println(" + " + ((byteOffsetVarName != null) ? byteOffsetVarName : "0") + ");");
} else {
// linear layout -> use memcpy
writer.println("memcpy((void *)"+receivingVarName+", (*env)->GetDirectBufferAddress(env, "+sourceVarName+"), sizeof("+receivingVarTypeString+"));");
}
if (emitElseClause) {
writer.println(" } else {");
writer.print(" ");
writer.print(" ");
if( receivingIsPtrPtr ) {
writer.print(receivingVarName);
writer.println(" = NULL;");
} else {
writer.println("memset((void *)"+receivingVarName+", 0, sizeof("+receivingVarTypeString+"));");
}
}
writer.println(" }");
writer.println();
}
private void emitReturnDirectBufferAddress(final PrintWriter writer,
final String sourceVarName,
final String receivingVarTypeString,
final String receivingVarName,
final boolean receivingIsPtrPtr,
final String byteOffsetVarName) {
writer.print(" ");
writer.print(" ");
if( receivingIsPtrPtr ) {
writer.print("(((char*) (*env)->GetDirectBufferAddress(env, "+sourceVarName+"))");
writer.println(" + " + ((byteOffsetVarName != null) ? byteOffsetVarName : "0") + ") = "+receivingVarName+";");
throw new RuntimeException("incomplete implementation"); // FIXME doesn't work, currently unused
} else {
// linear layout -> use memcpy
writer.println("memcpy((*env)->GetDirectBufferAddress(env, "+sourceVarName+"), "+receivingVarName+", sizeof("+receivingVarTypeString+"));");
}
writer.println();
}
// Note: if the data in the Type needs to be converted from the Java memory
// model to the C memory model prior to calling any C-side functions, then
// an extra variable named XXX_copy (where XXX is the value of the
// cVariableName argument) will be emitted and TRUE will be returned.
private boolean emitPointerDeclaration(final PrintWriter writer,
final JavaType javaType,
final Type cType,
final String cVariableName,
final String javaArgumentName) {
String ptrTypeString = null;
boolean needsDataCopy = false;
// Emit declaration for the pointer variable.
//
// Note that we don't need to obey const/volatile for outgoing arguments
//
if (javaType.isNIOBuffer()) {
ptrTypeString = cType.getName();
} else if (javaType.isArray() || javaType.isArrayOfCompoundTypeWrappers()) {
needsDataCopy = javaArgTypeNeedsDataCopy(javaType);
if (javaType.isPrimitiveArray() ||
javaType.isNIOBufferArray() ||
javaType.isArrayOfCompoundTypeWrappers()) {
ptrTypeString = cType.getName();
} else if (!javaType.isStringArray()) {
final Class elementType = javaType.getJavaClass().getComponentType();
if (elementType.isArray()) {
final Class subElementType = elementType.getComponentType();
if (subElementType.isPrimitive()) {
// type is pointer to pointer to primitive
ptrTypeString = cType.getName();
} else {
// type is pointer to pointer of some type we don't support (maybe
// it's an array of pointers to structs?)
throw new RuntimeException("Unsupported pointer type: \"" + cType.getName() + "\"");
}
} else {
// type is pointer to pointer of some type we don't support (maybe
// it's an array of pointers to structs?)
throw new RuntimeException("Unsupported pointer type: \"" + cType.getName() + "\"");
}
}
} else {
ptrTypeString = cType.getName();
}
writer.print(" ");
if (!needsDataCopy) {
// declare the pointer variable
writer.print(ptrTypeString);
if( !cType.isPointer() && javaType.isCompoundTypeWrapper() ) { // FIXME: Compound call-by-value
writer.print(" * ");
} else {
writer.print(" ");
}
writer.print(cVariableName);
writer.println(" = NULL;");
} else {
// Declare a variable to hold a copy of the argument data in which the
// incoming data has been properly laid out in memory to match the C
// memory model
if (javaType.isStringArray()) {
String cElementTypeName = "char *";
final PointerType cPtrType = cType.asPointer();
if (cPtrType != null) {
cElementTypeName = cPtrType.getTargetType().asPointer().getName();
}
if (isBaseTypeConst(cType)) {
writer.print("const ");
}
writer.print(cElementTypeName+" *");
} else {
if (isBaseTypeConst(cType)) {
writer.print("const ");
}
writer.print(ptrTypeString);
}
writer.print(" ");
writer.print(cVariableName);
writer.print("_copy = NULL; /* copy of data in ");
writer.print(javaArgumentName);
writer.println(", laid out according to C memory model */");
}
return needsDataCopy;
}
private void emitPointerConversion(final PrintWriter writer,
final MethodBinding binding,
final JavaType type,
final Type cType,
final String incomingArgumentName,
final String cVariableName,
String byteOffsetVarName) {
// Compound type wrappers do not get byte offsets added on
if (type.isCompoundTypeWrapper()) {
byteOffsetVarName = null;
}
final String cVariableType;
if( !cType.isPointer() && type.isCompoundTypeWrapper() ) { // FIXME: Compound call-by-value
cVariableType = cType.getName()+" *";
} else {
cVariableType = cType.getName();
}
emitGetDirectBufferAddress(writer,
incomingArgumentName,
cVariableType,
cVariableName,
true,
byteOffsetVarName, false);
}
protected String byteOffsetArgName(final int i) {
return JavaMethodBindingEmitter.byteOffsetArgName(binding.getArgumentName(i));
}
protected String isNIOArgName(final int i) {
return isNIOArgName(binding.getArgumentName(i));
}
protected String isNIOArgName(final String s) {
return s + "_is_nio";
}
protected String byteOffsetArrayArgName(final int i) {
return binding.getArgumentName(i) + "_byte_offset_array";
}
protected String[] argumentNameArray() {
final String[] argumentNames = new String[binding.getNumArguments()];
for (int i = 0; i < binding.getNumArguments(); i++) {
argumentNames[i] = binding.getArgumentName(i);
if (binding.getJavaArgumentType(i).isPrimitiveArray()) {
// Add on _offset argument in comma-separated expression
argumentNames[i] = argumentNames[i] + ", " + byteOffsetArgName(i);
}
}
return argumentNames;
}
protected String pointerConversionArgumentName(final String argName) {
return "_" + argName + "_ptr";
}
/**
* Class that emits a generic comment for CMethodBindingEmitters; the comment
* includes the C signature of the native method that is being bound by the
* emitter java method.
*/
protected static class DefaultCommentEmitter implements CommentEmitter {
@Override
public void emit(final FunctionEmitter emitter, final PrintWriter writer) {
emitBeginning((CMethodBindingEmitter)emitter, writer);
emitEnding((CMethodBindingEmitter)emitter, writer);
}
protected void emitBeginning(final CMethodBindingEmitter emitter, final PrintWriter writer) {
writer.println(" Java->C glue code:");
writer.print(" * Java package: ");
writer.print(emitter.getJavaPackageName());
writer.print(".");
writer.println(emitter.getJavaClassName());
writer.print(" * Java method: ");
final MethodBinding binding = emitter.getBinding();
writer.println(binding);
writer.println(" * C function: " + binding.getCSymbol());
}
protected void emitEnding(final CMethodBindingEmitter emitter, final PrintWriter writer) {
}
}
protected boolean javaArgTypeNeedsDataCopy(final JavaType javaArgType) {
if (javaArgType.isArray()) {
return (javaArgType.isNIOBufferArray() ||
javaArgType.isStringArray() ||
javaArgType.getJavaClass().getComponentType().isArray());
}
if (javaArgType.isArrayOfCompoundTypeWrappers()) {
return true;
}
return false;
}
}