Package com.google.inject.internal.aop
Class AbstractGlueGenerator
- java.lang.Object
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- com.google.inject.internal.aop.AbstractGlueGenerator
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abstract class AbstractGlueGenerator extends java.lang.Object
Support code for generating enhancer/fast-class glue.Each glue class has a trampoline that accepts an index, context object, and argument array:
public static Object GUICE$TRAMPOLINE(int index, Object context, Object[] args) { switch (index) { case 0: { return ...; } case 1: { return ...; } } return null; }
Each indexed statement in the trampoline invokes a constructor or method, returning the result. The expected context object depends on the statement; it could be the invocation target, some additional constructor context, or it may be unused. Arguments are unpacked from the array onto the call stack, unboxing or casting them as necessary. Primitive results are autoboxed before being returned.Where possible the trampoline is converted into a lookup
Function
mapping an integer to an invoker function, each invoker represented as aBiFunction
that accepts a context object plus argument array and returns the result. These functional interfaces are used to avoid introducing a dependency from the glue class to Guice specific types. This means the glue class can be loaded anywhere that can see the host class, it doesn't need access to Guice's ownClassLoader
. (In other words it removes any need for bridgeClassLoader
s.)
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Field Summary
Fields Modifier and Type Field Description private static java.util.concurrent.atomic.AtomicInteger
COUNTER
protected static java.lang.String
GENERATED_SOURCE
protected java.lang.Class<?>
hostClass
protected java.lang.String
hostName
protected java.lang.String
proxyName
protected static java.lang.String
TRAMPOLINE_DESCRIPTOR
The trampoline method takes an index, along with a context object and an array of argument objects, and invokes the appropriate constructor/method returning the result as an object.protected static java.lang.String
TRAMPOLINE_NAME
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Constructor Summary
Constructors Modifier Constructor Description protected
AbstractGlueGenerator(java.lang.Class<?> hostClass, java.lang.String marker)
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description private static <E extends java.lang.Throwable>
java.lang.RuntimeExceptionasIfUnchecked(java.lang.Throwable e)
Generics trick to get compiler to treat given exception as if unchecked (as JVM does).private static java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>>
bindSignaturesToInvokers(java.util.function.ToIntFunction<java.lang.String> signatureTable, java.lang.invoke.MethodHandle invokerTable)
Combines the signature and invoker tables into a mapping from signature to invoker.protected abstract void
generateConstructorInvoker(org.objectweb.asm.MethodVisitor mv, java.lang.reflect.Constructor<?> constructor)
Generate invoker that takes a context and an argument array and calls the constructor.protected abstract byte[]
generateGlue(java.util.Collection<java.lang.reflect.Executable> members)
Generates enhancer/fast-class bytecode for the given constructors/methods.protected abstract void
generateMethodInvoker(org.objectweb.asm.MethodVisitor mv, java.lang.reflect.Method method)
Generate invoker that takes an instance and an argument array and calls the method.protected void
generateTrampoline(org.objectweb.asm.ClassWriter cw, java.util.Collection<java.lang.reflect.Executable> members)
Generate trampoline that takes an index, along with a context object and array of argument objects, and invokes the appropriate constructor/method returning the result as an object.java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>>
glue(java.util.NavigableMap<java.lang.String,java.lang.reflect.Executable> glueMap)
Generates the enhancer/fast-class and returns a mapping from signature to invoker.protected abstract java.lang.invoke.MethodHandle
lookupInvokerTable(java.lang.Class<?> glueClass)
Lookup the invoker table; this may be represented by a function or a trampoline.private static java.lang.String
proxyName(java.lang.String hostName, java.lang.String marker, int hash)
Generates a unique name based on the original class name and marker.
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Field Detail
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GENERATED_SOURCE
protected static final java.lang.String GENERATED_SOURCE
- See Also:
- Constant Field Values
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TRAMPOLINE_NAME
protected static final java.lang.String TRAMPOLINE_NAME
- See Also:
- Constant Field Values
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TRAMPOLINE_DESCRIPTOR
protected static final java.lang.String TRAMPOLINE_DESCRIPTOR
The trampoline method takes an index, along with a context object and an array of argument objects, and invokes the appropriate constructor/method returning the result as an object.- See Also:
- Constant Field Values
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hostClass
protected final java.lang.Class<?> hostClass
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hostName
protected final java.lang.String hostName
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proxyName
protected final java.lang.String proxyName
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COUNTER
private static final java.util.concurrent.atomic.AtomicInteger COUNTER
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Method Detail
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proxyName
private static java.lang.String proxyName(java.lang.String hostName, java.lang.String marker, int hash)
Generates a unique name based on the original class name and marker.
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glue
public final java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>> glue(java.util.NavigableMap<java.lang.String,java.lang.reflect.Executable> glueMap)
Generates the enhancer/fast-class and returns a mapping from signature to invoker.
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generateGlue
protected abstract byte[] generateGlue(java.util.Collection<java.lang.reflect.Executable> members)
Generates enhancer/fast-class bytecode for the given constructors/methods.
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lookupInvokerTable
protected abstract java.lang.invoke.MethodHandle lookupInvokerTable(java.lang.Class<?> glueClass) throws java.lang.Throwable
Lookup the invoker table; this may be represented by a function or a trampoline.- Throws:
java.lang.Throwable
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bindSignaturesToInvokers
private static java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>> bindSignaturesToInvokers(java.util.function.ToIntFunction<java.lang.String> signatureTable, java.lang.invoke.MethodHandle invokerTable)
Combines the signature and invoker tables into a mapping from signature to invoker.
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asIfUnchecked
private static <E extends java.lang.Throwable> java.lang.RuntimeException asIfUnchecked(java.lang.Throwable e) throws E extends java.lang.Throwable
Generics trick to get compiler to treat given exception as if unchecked (as JVM does).- Throws:
E extends java.lang.Throwable
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generateTrampoline
protected final void generateTrampoline(org.objectweb.asm.ClassWriter cw, java.util.Collection<java.lang.reflect.Executable> members)
Generate trampoline that takes an index, along with a context object and array of argument objects, and invokes the appropriate constructor/method returning the result as an object.
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generateConstructorInvoker
protected abstract void generateConstructorInvoker(org.objectweb.asm.MethodVisitor mv, java.lang.reflect.Constructor<?> constructor)
Generate invoker that takes a context and an argument array and calls the constructor.
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generateMethodInvoker
protected abstract void generateMethodInvoker(org.objectweb.asm.MethodVisitor mv, java.lang.reflect.Method method)
Generate invoker that takes an instance and an argument array and calls the method.
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