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A library for invoking native functions from java
/*
* Copyright (C) 2008-2010 Wayne Meissner
*
* This file is part of the JNR project.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jnr.ffi.provider.jffi;
import com.kenai.jffi.*;
import com.kenai.jffi.CallingConvention;
import com.kenai.jffi.Platform;
import com.kenai.jffi.Type;
import jnr.ffi.*;
import jnr.ffi.NativeType;
import jnr.ffi.Struct;
import jnr.ffi.annotations.*;
import jnr.ffi.byref.ByReference;
import jnr.ffi.mapper.FromNativeConverter;
import jnr.ffi.mapper.ToNativeConverter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.nio.Buffer;
import java.util.Map;
import static jnr.ffi.provider.jffi.AsmUtil.isDelegate;
final class InvokerUtil {
static NativeType getAliasedNativeType(NativeRuntime runtime, Class type, final Annotation[] annotations) {
for (Annotation a : annotations) {
TypeDefinition typedef = a.annotationType().getAnnotation(TypeDefinition.class);
if (typedef != null) {
return nativeType(runtime.findType(typedef.alias()));
}
}
if (isLong32(type, annotations)) {
return NativeType.SLONG;
} else if (isLongLong(type, annotations)) {
return NativeType.SLONGLONG;
}
return null;
}
public static final boolean requiresErrno(Method method) {
boolean saveError = true;
for (Annotation a : method.getAnnotations()) {
if (a instanceof IgnoreError) {
saveError = false;
} else if (a instanceof SaveError) {
saveError = true;
}
}
return saveError;
}
public static com.kenai.jffi.CallingConvention getCallingConvention(Map libraryOptions) {
Object convention = libraryOptions.get(LibraryOption.CallingConvention);
// If someone passed in the jffi calling convention, just use it.
if (convention instanceof com.kenai.jffi.CallingConvention) {
return (com.kenai.jffi.CallingConvention) convention;
}
if (convention instanceof jnr.ffi.CallingConvention) switch ((jnr.ffi.CallingConvention) convention) {
case DEFAULT:
return com.kenai.jffi.CallingConvention.DEFAULT;
case STDCALL:
return com.kenai.jffi.CallingConvention.STDCALL;
} else if (convention != null) {
throw new IllegalArgumentException("unknown calling convention: " + convention);
}
return com.kenai.jffi.CallingConvention.DEFAULT;
}
public static boolean hasAnnotation(Annotation[] annotations, Class annotationClass) {
for (Annotation a : annotations) {
if (annotationClass.isInstance(a)) {
return true;
}
}
return false;
}
static boolean isLong32(Class type, Annotation[] annotations) {
return (long.class == type || Long.class.isAssignableFrom(type))
&& Platform.getPlatform().longSize() == 32
&& !hasAnnotation(annotations, LongLong.class);
}
static boolean isLongLong(Class type, Annotation[] annotations) {
return (long.class == type || Long.class.isAssignableFrom(type))
&& (hasAnnotation(annotations, LongLong.class) || Platform.getPlatform().longSize() == 64);
}
static Type jffiType(jnr.ffi.NativeType jnrType) {
switch (jnrType) {
case VOID:
return Type.VOID;
case SCHAR:
return Type.SCHAR;
case UCHAR:
return Type.UCHAR;
case SSHORT:
return Type.SSHORT;
case USHORT:
return Type.USHORT;
case SINT:
return Type.SINT;
case UINT:
return Type.UINT;
case SLONG:
return Type.SLONG;
case ULONG:
return Type.ULONG;
case SLONGLONG:
return Type.SLONG_LONG;
case ULONGLONG:
return Type.ULONG_LONG;
case FLOAT:
return Type.FLOAT;
case DOUBLE:
return Type.DOUBLE;
case ADDRESS:
return Type.POINTER;
default:
throw new IllegalArgumentException("unsupported parameter type: " + jnrType);
}
}
static NativeType nativeType(jnr.ffi.Type jnrType) {
return jnrType.getNativeType();
}
static ResultType getResultType(NativeRuntime runtime, Class type, Annotation[] annotations, FromNativeConverter fromNativeConverter) {
NativeType nativeType = getMethodResultNativeType(runtime, fromNativeConverter != null ? fromNativeConverter.nativeType() : type, annotations);
return new ResultType(type, nativeType, annotations, fromNativeConverter);
}
static ParameterType getParameterType(NativeRuntime runtime, Class type, Annotation[] annotations, ToNativeConverter toNativeConverter) {
NativeType nativeType = getMethodParameterNativeType(runtime, toNativeConverter != null ? toNativeConverter.nativeType() : type, annotations);
return new ParameterType(type, nativeType, annotations, toNativeConverter);
}
static CallContext getCallContext(SigType resultType, SigType[] parameterTypes, com.kenai.jffi.CallingConvention convention, boolean requiresErrno) {
com.kenai.jffi.Type[] nativeParamTypes = new com.kenai.jffi.Type[parameterTypes.length];
for (int i = 0; i < nativeParamTypes.length; ++i) {
nativeParamTypes[i] = jffiType(parameterTypes[i].nativeType);
}
return CallContextCache.getInstance().getCallContext(jffiType(resultType.nativeType),
nativeParamTypes, convention, requiresErrno);
}
static CallContext getCallContext(NativeType resultType, NativeType[] parameterTypes, com.kenai.jffi.CallingConvention convention, boolean requiresErrno) {
com.kenai.jffi.Type[] nativeParamTypes = new com.kenai.jffi.Type[parameterTypes.length];
for (int i = 0; i < nativeParamTypes.length; ++i) {
nativeParamTypes[i] = jffiType(parameterTypes[i]);
}
return CallContextCache.getInstance().getCallContext(jffiType(resultType),
nativeParamTypes, convention, requiresErrno);
}
public static com.kenai.jffi.CallingConvention getNativeCallingConvention(Method m) {
if (m.getAnnotation(StdCall.class) != null || m.getDeclaringClass().getAnnotation(StdCall.class) != null) {
return CallingConvention.STDCALL;
}
return CallingConvention.DEFAULT;
}
static NativeType getNativeType(NativeRuntime runtime, Class type, final Annotation[] annotations) {
NativeType aliasedType = getAliasedNativeType(runtime, type, annotations);
if (aliasedType != null) {
return aliasedType;
} else if (Void.class.isAssignableFrom(type) || void.class == type) {
return NativeType.VOID;
} else if (Boolean.class.isAssignableFrom(type) || boolean.class == type) {
return NativeType.SINT;
} else if (Byte.class.isAssignableFrom(type) || byte.class == type) {
return NativeType.SCHAR;
} else if (Short.class.isAssignableFrom(type) || short.class == type) {
return NativeType.SSHORT;
} else if (Integer.class.isAssignableFrom(type) || int.class == type) {
return NativeType.SINT;
} else if (Long.class.isAssignableFrom(type) || long.class == type) {
return isLongLong(type, annotations) ? NativeType.SLONGLONG : NativeType.SLONG;
} else if (NativeLong.class.isAssignableFrom(type)) {
return NativeType.SLONG;
} else if (Float.class.isAssignableFrom(type) || float.class == type) {
return NativeType.FLOAT;
} else if (Double.class.isAssignableFrom(type) || double.class == type) {
return NativeType.DOUBLE;
} else if (Pointer.class.isAssignableFrom(type)) {
return NativeType.ADDRESS;
} else if (Address.class.isAssignableFrom(type)) {
return NativeType.ADDRESS;
} else if (Struct.class.isAssignableFrom(type)) {
return NativeType.ADDRESS;
} else if (String.class.isAssignableFrom(type)) {
return NativeType.ADDRESS;
} else if (Buffer.class.isAssignableFrom(type)) {
return NativeType.ADDRESS;
} else if (CharSequence.class.isAssignableFrom(type)) {
return NativeType.ADDRESS;
} else if (ByReference.class.isAssignableFrom(type)) {
return NativeType.ADDRESS;
} else if (type.isArray()) {
return NativeType.ADDRESS;
} else if (isDelegate(type)) {
return NativeType.ADDRESS;
} else {
throw new IllegalArgumentException("unsupported type: " + type);
}
}
static NativeType getMethodParameterNativeType(NativeRuntime runtime, Class parameterClass, Annotation[] annotations) {
return getNativeType(runtime, parameterClass, annotations);
}
static NativeType getMethodResultNativeType(NativeRuntime runtime, Class parameterClass, Annotation[] annotations) {
return getNativeType(runtime, parameterClass, annotations);
}
}