package org.jruby.ext.ffi.jffi;
import com.kenai.jffi.CallContext;
import com.kenai.jffi.CallingConvention;
import org.jruby.ext.ffi.NativeType;
import com.kenai.jffi.Platform;
/**
*
*/
final class FastIntMethodGenerator extends AbstractNumericMethodGenerator {
private static final int MAX_PARAMETERS = getMaximumFastIntParameters();
private static final String[] signatures = buildSignatures(int.class, MAX_PARAMETERS);
private static final String[] methodNames = {
"invokeI0", "invokeI1", "invokeI2", "invokeI3", "invokeI4", "invokeI5", "invokeI6"
};
String getInvokerMethodName(JITSignature signature) {
final int parameterCount = signature.getParameterCount();
if (parameterCount <= MAX_PARAMETERS && parameterCount <= methodNames.length) {
return methodNames[parameterCount];
} else {
throw new IllegalArgumentException("invalid fast-int parameter count: " + parameterCount);
}
}
String getInvokerSignature(int parameterCount) {
if (parameterCount <= MAX_PARAMETERS && parameterCount <= signatures.length) {
return signatures[parameterCount];
}
throw new IllegalArgumentException("invalid fast-int parameter count: " + parameterCount);
}
final Class getInvokerIntType() {
return int.class;
}
public boolean isSupported(JITSignature signature) {
final int parameterCount = signature.getParameterCount();
if (!signature.getCallingConvention().equals(CallingConvention.DEFAULT) || parameterCount > MAX_PARAMETERS) {
return false;
}
final Platform platform = Platform.getPlatform();
if (platform.getOS().equals(Platform.OS.WINDOWS)) {
return false;
}
if (!platform.getCPU().equals(Platform.CPU.I386) && !platform.getCPU().equals(Platform.CPU.X86_64)) {
return false;
}
for (int i = 0; i < parameterCount; i++) {
if (!isFastIntParameter(platform, signature.getParameterType(i))) {
return false;
}
}
return isFastIntResult(platform, signature.getResultType());
}
final static int getMaximumFastIntParameters() {
try {
com.kenai.jffi.Invoker.class.getDeclaredMethod("invokeI6", CallContext.class, long.class,
int.class, int.class, int.class, int.class, int.class, int.class);
return 6;
} catch (Throwable t) {
return -1;
}
}
private static boolean isFastIntType(Platform platform, NativeType type) {
switch (type) {
case BOOL:
case CHAR:
case UCHAR:
case SHORT:
case USHORT:
case INT:
case UINT:
return true;
case LONG:
case ULONG:
return platform.longSize() == 32;
default:
return false;
}
}
static boolean isFastIntResult(Platform platform, NativeType type) {
switch (type) {
case VOID:
return true;
case POINTER:
case STRING:
case TRANSIENT_STRING:
return platform.addressSize() == 32;
default:
return isFastIntType(platform, type);
}
}
static boolean isFastIntParameter(Platform platform, NativeType type) {
switch (type) {
case POINTER:
case BUFFER_IN:
case BUFFER_OUT:
case BUFFER_INOUT:
case STRING:
case TRANSIENT_STRING:
return platform.addressSize() == 32;
default:
return isFastIntType(platform, type);
}
}
}