public Signature getSignature() {
ForeignCallDescriptor d = linkage.getDescriptor();
MetaAccessProvider metaAccess = providers.getMetaAccess();
Class<?>[] arguments = d.getArgumentTypes();
ResolvedJavaType[] parameters = new ResolvedJavaType[arguments.length];
for (int i = 0; i < arguments.length; i++) {
parameters[i] = metaAccess.lookupJavaType(arguments[i]);
}
return new HotSpotSignature(
jvmciRuntime, metaAccess.lookupJavaType(d.getResultType()), parameters);
}
/** Gets a calling convention for a given descriptor and call type. */
public static CallingConvention createCallingConvention(
MetaAccessProvider metaAccess,
CodeCacheProvider codeCache,
ForeignCallDescriptor descriptor,
Type ccType) {
assert ccType != null;
Class<?>[] argumentTypes = descriptor.getArgumentTypes();
JavaType[] parameterTypes = new JavaType[argumentTypes.length];
for (int i = 0; i < parameterTypes.length; ++i) {
parameterTypes[i] = asJavaType(argumentTypes[i], metaAccess, codeCache);
}
TargetDescription target = codeCache.getTarget();
JavaType returnType = asJavaType(descriptor.getResultType(), metaAccess, codeCache);
RegisterConfig regConfig = codeCache.getRegisterConfig();
return regConfig.getCallingConvention(ccType, returnType, parameterTypes, target);
}
/**
* Creates a stub for a call to code at a given address.
*
* @param address the address of the code to call
* @param descriptor the signature of the call to this stub
* @param prependThread true if the JavaThread value for the current thread is to be prepended to
* the arguments for the call to {@code address}
* @param reexecutable specifies if the stub call can be re-executed without (meaningful) side
* effects. Deoptimization will not return to a point before a stub call that cannot be
* re-executed.
* @param killedLocations the memory locations killed by the stub call
*/
public ForeignCallStub(
HotSpotJVMCIRuntimeProvider runtime,
HotSpotProviders providers,
long address,
ForeignCallDescriptor descriptor,
boolean prependThread,
Transition transition,
boolean reexecutable,
LocationIdentity... killedLocations) {
super(
providers,
HotSpotForeignCallLinkageImpl.create(
providers.getMetaAccess(),
providers.getCodeCache(),
providers.getForeignCalls(),
descriptor,
0L,
PRESERVES_REGISTERS,
JavaCall,
JavaCallee,
transition,
reexecutable,
killedLocations));
this.jvmciRuntime = runtime;
this.prependThread = prependThread;
Class<?>[] targetParameterTypes = createTargetParameters(descriptor);
ForeignCallDescriptor targetSig =
new ForeignCallDescriptor(
descriptor.getName() + ":C", descriptor.getResultType(), targetParameterTypes);
target =
HotSpotForeignCallLinkageImpl.create(
providers.getMetaAccess(),
providers.getCodeCache(),
providers.getForeignCalls(),
targetSig,
address,
DESTROYS_REGISTERS,
NativeCall,
NativeCall,
transition,
reexecutable,
killedLocations);
}
private Class<?>[] createTargetParameters(ForeignCallDescriptor descriptor) {
Class<?>[] parameters = descriptor.getArgumentTypes();
if (prependThread) {
Class<?>[] newParameters = new Class<?>[parameters.length + 1];
System.arraycopy(parameters, 0, newParameters, 1, parameters.length);
newParameters[0] = Word.class;
return newParameters;
}
return parameters;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(stub == null ? descriptor.toString() : stub.toString());
sb.append("@0x")
.append(Long.toHexString(address))
.append(':')
.append(outgoingCallingConvention)
.append(":")
.append(incomingCallingConvention);
if (temporaries != null && temporaries.length != 0) {
sb.append("; temps=");
String sep = "";
for (Value op : temporaries) {
sb.append(sep).append(op);
sep = ",";
}
}
return sb.toString();
}