com.oracle.svm.jni.hosted

Class JNICallTrampolineMethod

java.lang.Object

com.oracle.svm.hosted.annotation.CustomSubstitutionMethod

com.oracle.svm.jni.hosted.JNICallTrampolineMethod

All Implemented Interfaces:

com.oracle.graal.pointsto.infrastructure.GraphProvider, AnnotatedElement, jdk.vm.ci.meta.InvokeTarget, jdk.vm.ci.meta.JavaMethod, jdk.vm.ci.meta.ModifiersProvider, jdk.vm.ci.meta.ResolvedJavaMethod

public class JNICallTrampolineMethod
extends CustomSubstitutionMethod

A trampoline for implementing JNI functions for calling Java methods from native code:

NativeType CallStaticMethod(JNIEnv *env, jclass clazz, jmethodID methodID, ...); NativeType CallMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...);

The jmethodID values that we pass out are the addresses of JNIAccessibleMethod objects, which are made immutable so that they are never moved by the garbage collector. The trampoline simply jumps to the address of a specific call wrapper that is stored in a field of the object. The wrappers then take care of spilling callee-saved registers, transitioning from native to Java and back, obtaining the arguments in a particular form (varargs, array, va_list) and boxing/unboxing object handles as necessary.

Nested Class Summary

Nested classes/interfaces inherited from interface jdk.vm.ci.meta.ResolvedJavaMethod

jdk.vm.ci.meta.ResolvedJavaMethod.Parameter

Nested classes/interfaces inherited from interface com.oracle.graal.pointsto.infrastructure.GraphProvider

com.oracle.graal.pointsto.infrastructure.GraphProvider.Purpose

Field Summary

Fields inherited from class com.oracle.svm.hosted.annotation.CustomSubstitutionMethod

original

Constructor Summary

Constructors

Constructor and Description
JNICallTrampolineMethod(jdk.vm.ci.meta.ResolvedJavaMethod original, jdk.vm.ci.meta.ResolvedJavaField callWrapperField, boolean nonVirtual)

Method Summary

Modifier and Type	Method and Description
org.graalvm.compiler.nodes.StructuredGraph	buildGraph(org.graalvm.compiler.debug.DebugContext debug, jdk.vm.ci.meta.ResolvedJavaMethod method, com.oracle.graal.pointsto.meta.HostedProviders providers, com.oracle.graal.pointsto.infrastructure.GraphProvider.Purpose purpose)
CompileQueue.CompileFunction	createCustomCompileFunction()
CompileQueue.ParseFunction	createCustomParseFunction()
int	getModifiers()

Methods inherited from class com.oracle.svm.hosted.annotation.CustomSubstitutionMethod

allowRuntimeCompilation, asStackTraceElement, canBeInlined, canBeStaticallyBound, getAnnotation, getAnnotations, getCode, getCodeSize, getConstantPool, getDeclaredAnnotations, getDeclaringClass, getEncoding, getExceptionHandlers, getGenericParameterTypes, getLineNumberTable, getLocalVariableTable, getMaxLocals, getMaxStackSize, getName, getOriginal, getParameterAnnotations, getParameters, getProfilingInfo, getSignature, getSpeculationLog, hasNeverInlineDirective, isBridge, isClassInitializer, isConstructor, isDefault, isInVirtualMethodTable, isSynthetic, isVarArgs, reprofile, shouldBeInlined

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface jdk.vm.ci.meta.ResolvedJavaMethod

getParameterAnnotation, getParameterAnnotations, getProfilingInfo, hasBytecodes, hasReceiver, isFinal, isJavaLangObjectInit, toParameterTypes

Methods inherited from interface jdk.vm.ci.meta.JavaMethod

format

Methods inherited from interface jdk.vm.ci.meta.ModifiersProvider

isAbstract, isConcrete, isFinalFlagSet, isInterface, isNative, isPackagePrivate, isPrivate, isProtected, isPublic, isStatic, isStrict, isSynchronized, isTransient, isVolatile

Methods inherited from interface java.lang.reflect.AnnotatedElement

getAnnotationsByType, getDeclaredAnnotation, getDeclaredAnnotationsByType, isAnnotationPresent

Constructor Detail

JNICallTrampolineMethod

public JNICallTrampolineMethod(jdk.vm.ci.meta.ResolvedJavaMethod original,
                               jdk.vm.ci.meta.ResolvedJavaField callWrapperField,
                               boolean nonVirtual)

Method Detail

getModifiers

public int getModifiers()

Specified by:

getModifiers in interface jdk.vm.ci.meta.ModifiersProvider

Overrides:

getModifiers in class CustomSubstitutionMethod

buildGraph

public org.graalvm.compiler.nodes.StructuredGraph buildGraph(org.graalvm.compiler.debug.DebugContext debug,
                                                             jdk.vm.ci.meta.ResolvedJavaMethod method,
                                                             com.oracle.graal.pointsto.meta.HostedProviders providers,
                                                             com.oracle.graal.pointsto.infrastructure.GraphProvider.Purpose purpose)

createCustomParseFunction

public CompileQueue.ParseFunction createCustomParseFunction()

createCustomCompileFunction

public CompileQueue.CompileFunction createCustomCompileFunction()