package jnr.ffi.provider.jffi;
import com.kenai.jffi.CallContext;
import com.kenai.jffi.CallingConvention;
import com.kenai.jffi.Platform;
import jnr.ffi.NativeType;
import static jnr.ffi.provider.jffi.AsmUtil.isDelegate;
import static jnr.ffi.provider.jffi.CodegenUtils.ci;
import static jnr.ffi.provider.jffi.FastIntMethodGenerator.isFastIntType;
import static jnr.ffi.provider.jffi.Util.getBooleanProperty;
/**
*
*/
public class FastLongMethodGenerator extends AbstractFastNumericMethodGenerator {
private static final boolean ENABLED = getBooleanProperty("jnr.ffi.fast-long.enabled", true);
private static final int MAX_PARAMETERS = getMaximumFastLongParameters();
private static final String[] signatures;
private static final String[] methodNames = {
"invokeL0", "invokeL1", "invokeL2", "invokeL3", "invokeL4", "invokeL5", "invokeL6"
};
static {
signatures = new String[MAX_PARAMETERS + 1];
for (int i = 0; i <= MAX_PARAMETERS; i++) {
StringBuilder sb = new StringBuilder();
sb.append('(').append(ci(CallContext.class)).append(ci(long.class));
for (int n = 0; n < i; n++) {
sb.append('J');
}
signatures[i] = sb.append(")J").toString();
}
}
@Override
String getInvokerMethodName(ResultType resultType, ParameterType[] parameterTypes, boolean ignoreErrno) {
final int parameterCount = parameterTypes.length;
if (parameterCount <= MAX_PARAMETERS && parameterCount <= methodNames.length) {
return methodNames[parameterCount];
} else {
throw new IllegalArgumentException("invalid fast-int parameter count: " + parameterCount);
}
}
@Override
String getInvokerSignature(int parameterCount, Class nativeIntType) {
if (parameterCount <= MAX_PARAMETERS && parameterCount <= signatures.length) {
return signatures[parameterCount];
} else {
throw new IllegalArgumentException("invalid fast-int parameter count: " + parameterCount);
}
}
@Override
Class getInvokerType() {
return long.class;
}
public boolean isSupported(ResultType resultType, ParameterType[] parameterTypes, CallingConvention callingConvention) {
final int parameterCount = parameterTypes.length;
if (!ENABLED) {
return false;
}
if (callingConvention != CallingConvention.DEFAULT || parameterCount > MAX_PARAMETERS) {
return false;
}
final Platform platform = Platform.getPlatform();
// Only supported on amd64 arches
if (platform.getCPU() != Platform.CPU.X86_64) {
return false;
}
if (platform.getOS().equals(Platform.OS.WINDOWS)) {
return false;
}
for (ParameterType parameterType : parameterTypes) {
if (!isFastLongParameter(platform, parameterType)) {
return false;
}
}
return isFastLongResult(platform, resultType);
}
static int getMaximumFastLongParameters() {
try {
com.kenai.jffi.Invoker.class.getDeclaredMethod("invokeL6", CallContext.class, long.class,
long.class, long.class, long.class, long.class, long.class, long.class);
return 6;
} catch (Throwable t) {
return 0;
}
}
private static boolean isFastLongType(Platform platform, SigType type) {
return isFastIntType(platform, type)
|| type.nativeType == NativeType.SLONG || type.nativeType == NativeType.ULONG
|| type.nativeType == NativeType.SLONGLONG || type.nativeType == NativeType.ULONGLONG;
}
static boolean isFastLongResult(Platform platform, ResultType resultType) {
return isFastLongType(platform, resultType)
|| resultType.nativeType == NativeType.VOID
|| (resultType.nativeType == NativeType.ADDRESS && resultType.size() == 8)
;
}
static boolean isFastLongParameter(Platform platform, ParameterType type) {
return isFastLongType(platform, type) || (isDelegate(type) && type.size() == 8);
}
}