def binaryLambda(
objClass,
method_name,
argClass,
interface=BiConsumer,
interface_method="accept",
classname=None,
return_type="V", # can be a class too
as_instance=True
): # return as an instance when True, as a class when False
"""
Define a interface<O, A> with an interface_method with body O.method_name(A).
For example, a BiConsumer with an "accept" method that takes two arguments an has arg1.method_name(arg2) as body.
"""
if classname is None:
classname = "asm/loop/%s_%s_%s_%s" % (
interface.getSimpleName(), objClass.getSimpleName(), method_name,
argClass.getSimpleName())
cw = initClass(classname,
class_parameters=[("O", objClass), ("A", argClass)],
interfaces=[interface],
interfaces_parameters={interface: ["O", "A"]})
mv = initMethod(cw,
interface_method,
argument_classes=[objClass, argClass],
return_type=return_type)
mv.visitCode()
# implement Obj.method_name(Arg)
mv.visitVarInsn(Opcodes.ALOAD,
1) # The first argument of the interface_method
mv.visitVarInsn(Opcodes.ALOAD,
2) # The second argument of the interface_method
# Use the first loaded object as the object onto which to invoke method_name
# and the second loaded object as its argument, so Obj.method_name(Arg)
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
objClass.getName().replace(".", "/"), method_name,
"(L%s;)V" % argClass.getName().replace(".", "/"), False)
mv.visitInsn(Opcodes.RETURN)
mv.visitMaxs(2, 3)
mv.visitEnd()
# The interface_method was from an interface, so add a bridge method that checks casts
initMethodObj(cw,
classname,
interface_method,
argument_classes=[objClass, argClass],
return_type=return_type)
cw.visitEnd()
lambdaClass = CustomClassLoader().defineClass(classname, cw.toByteArray())
return lambdaClass.newInstance() if as_instance else lambdaClass
def defineBiConsumerTypeSet2(imglib2Type,
classname=None,
return_type="V"): # can be a class too
""" Exactly the same as defineBiConsumerTypeSet but using lib.asm library functions to cut to the chase. """
if classname is None:
classname = "asm/loop/BiConsumer_%s_set" % imglib2Type.getSimpleName()
cw = initClass(classname,
class_parameters=[("T", imglib2Type)],
interfaces=[BiConsumer],
interfaces_parameters={BiConsumer: ["T", "T"]})
mv = initMethod(cw,
"accept",
argument_classes=[imglib2Type, imglib2Type],
return_type=return_type)
mv.visitCode()
# implement t2.set(t1)
mv.visitVarInsn(Opcodes.ALOAD, 2) # load second argument first
mv.visitVarInsn(Opcodes.ALOAD, 1) # then load the first argument
# Use the first loaded object as the object onto which to invoke "set", and the second loaded object as its argument, so t2.set(t1)
typeClassname = imglib2Type.getName().replace(".", "/")
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, typeClassname, "set",
"(L%s;)V" % typeClassname, False)
mv.visitInsn(Opcodes.RETURN)
mv.visitMaxs(2, 3)
mv.visitEnd()
# The "accept" method was from an interface, so add a bridge method that checks casts
initMethodObj(cw,
classname,
"accept",
argument_classes=[imglib2Type, imglib2Type],
return_type=return_type)
cw.visitEnd()
loader = CustomClassLoader()
biconsumerClass = loader.defineClass(classname, cw.toByteArray())
return biconsumerClass
def nthLambda(
objClass,
method_name,
argClasses, # a list, can be empty, max 14 elements
interface, # the interface with at least one generic type for objClass
interface_method, # with as many arguments as argClasses
classname=None,
return_type="V", # can be a class too
as_instance=True
): # return as an instance when True, as a class when False
"""
Define an interface<O, A1, A2, ...> with an interface_method with body O.method_name(A1, A2, ...).
For example, a BiConsumer with an "accept(O arg1, A1 arg2)" method that takes two arguments an has arg1.method_name(arg2) as body.
objClass: the class of the object onto which to invoke the method of name method_name with arguments of class as in argClasses.
method_name: the name of the method to invoke on the objClass instance passed as the first argument of the interface method.
argClasses: list of classes for the arguments of the method of method_name in objClass.
interface: the class of the interface to implement with as many generic parameters as 1 + len(argClasses), e.g., BiConsumer<O, A>.
interface_method: the name of the method to implement for the interface, e.g., "accept" for BiConsumer.
classname: the name of the class to create implementing the interface. Will be autogenerated when None.
return_type: return type of the interface method; defaults to "V" (void), can also be a class.
as_instance: when True (default), return a new instance of the newly created class, otherwise return the class.
"""
if classname is None:
classname = "asm/loop/%s_%s_%s_%s" % (
interface.getSimpleName(), objClass.getSimpleName(), method_name,
"_".join(argClass.getSimpleName() for argClass in argClasses))
if len(argClasses) > 14:
print "ERROR: nthLambda can't have more han 13 argClasses."
return None
parameters = [("O", objClass)] + zip("ABCDEFGHIJKLMN", argClasses)
cw = initClass(classname,
class_parameters=parameters,
interfaces=[interface],
interfaces_parameters={
interface: [letter for letter, _ in parameters]
})
mv = initMethod(cw,
interface_method,
argument_classes=[objClass] + argClasses,
return_type=return_type)
mv.visitCode()
# implement Obj.method_name(Arg1, Arg2, ...)
for i in xrange(1, 1 + len(argClasses) + 1):
mv.visitVarInsn(Opcodes.ALOAD, i) # 1-based
# Use the first loaded object as the object onto which to invoke method_name
# and the second loaded object as its argument, so Obj.method_name(Arg)
mv.visitMethodInsn(
Opcodes.INVOKEVIRTUAL,
objClass.getName().replace(".", "/"), method_name,
"(%s)V" % "".join("L%s;" % argClass.getName().replace(".", "/")
for argClass in argClasses), False)
mv.visitInsn(Opcodes.RETURN)
mv.visitMaxs(1 + len(argClasses), 2 + len(argClasses))
mv.visitEnd()
# The interface_method was from an interface, so add a bridge method that checks casts
initMethodObj(cw,
classname,
interface_method,
argument_classes=[objClass] + argClasses,
return_type=return_type)
cw.visitEnd()
lambdaClass = CustomClassLoader().defineClass(classname, cw.toByteArray())
return lambdaClass.newInstance() if as_instance else lambdaClass
c.visitVarInsn(Opcodes.ALOAD, 0)
c.visitVarInsn(Opcodes.ALOAD, 1)
field = {
"classname": "my/UnsignedByteToFloatAccess",
"name": "sampler",
"descriptor": "Lnet/imglib2/Sampler;"
}
c.visitFieldInsn(Opcodes.PUTFIELD, field["classname"], field["name"],
field["descriptor"])
c.visitInsn(Opcodes.RETURN)
c.visitMaxs(2, 2)
c.visitEnd()
# Declare getValue and setValue methods
gv = initMethod(facc,
"getValue",
access=Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL,
descriptor="(I)F")
gv.visitVarInsn(Opcodes.ALOAD, 0)
gv.visitFieldInsn(Opcodes.GETFIELD, field["classname"], field["name"],
field["descriptor"])
gv.visitMethodInsn(
Opcodes.INVOKEINTERFACE,
Type.getInternalName(Sampler),
"get",
"()L%s;" % Type.getInternalName(Object), # isn't this weird? Why Object?
True)
gv.visitTypeInsn(Opcodes.CHECKCAST, Type.getInternalName(UnsignedByteType))
gv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
Type.getInternalName(UnsignedByteType), "getRealFloat",
"()F", False)
gv.visitInsn(Opcodes.FRETURN) # native float return
def defineSamplerConverter(
fromType,
toType,
classname="",
toAccess=None,
fromMethod="getRealFloat",
fromMethodReturnType="F", # F: native float; if a class, use: "L%s;" % Type.getInternalName(TheClass)
toMethod="setReal",
toMethodArgType="F"): # F: native float
""" A class implementing SamplerConverter, in asm for high-performance (25x jython's speed).
fromType: the source type to convert like e.g. UnsignedByteType.
toType: the target type, like e.g. FloatType.
classname: optional, the fully qualified name for the new class implementing SamplerConverter.
fromMethod: the name of the fromType class method to use for getting its value.
Defaults to "getRealFloat" from the RealType interface.
fromMethodReturnType: a single letter, like:
'F': float, 'D': double, 'C': char, 'B': byte, 'Z': boolean, 'S': short, 'I': integer, 'J': long
See: https://gitlab.ow2.org/asm/asm/blob/master/asm/src/main/java/org/objectweb/asm/Frame.java
toMethod: the name of the toType class method for setting the value.
Defaults to "setReal" from the RealType interface.
toMethodArgType: a single letter, like:
'F': float, 'D': double, 'C': char, 'B': byte, 'Z': boolean, 'S': short, 'I': integer, 'J': long
toAccess: the interface to implement, such as FloatAccess. Optional, will be guessed. """
if toAccess is None:
toTypeName = toType.getSimpleName()
name = toTypeName[0:toTypeName.rfind("Type")]
if name.startswith("Unsigned"):
name = name[8:]
toAccessName = "net.imglib2.img.basictypeaccess.%sAccess" % name
toAccess = CustomClassLoader().loadClass(
"net.imglib2.img.basictypeaccess.%sAccess" % name)
if "" == classname:
classname = "asm/converters/%sTo%sSamplerConverter" % (
fromType.getSimpleName(), toType.getSimpleName())
access_classname = "asm/converters/%sTo%sAccess" % (
fromType.getSimpleName(), toType.getSimpleName())
# First *Access class like e.g. FloatAccess
facc = initClass(access_classname,
access=Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL,
interfaces=[toAccess],
interfaces_parameters={},
with_default_constructor=False)
# private final "sampler" field
f = facc.visitField(
Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, "sampler",
"L%s;" % Type.getInternalName(Sampler),
"L%s<+L%s;>;" % tuple(imap(Type.getInternalName,
(Sampler, fromType))), None)
# The constructor has to initialize the field "sampler"
c = initConstructor(facc,
descriptor="(Lnet/imglib2/Sampler;)V",
signature="(Lnet/imglib2/Sampler<+L%s;>;)V" %
Type.getInternalName(fromType))
# The 'c' constructor already invoked <init>
# Now onto the rest of the constructor body:
c.visitVarInsn(Opcodes.ALOAD, 0)
c.visitVarInsn(Opcodes.ALOAD, 1)
field = {
"classname": access_classname,
"name": "sampler",
"descriptor": "Lnet/imglib2/Sampler;"
}
c.visitFieldInsn(Opcodes.PUTFIELD, field["classname"], field["name"],
field["descriptor"])
c.visitInsn(Opcodes.RETURN)
c.visitMaxs(2, 2)
c.visitEnd()
# Declare getValue and setValue methods
gv = initMethod(facc,
"getValue",
access=Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL,
descriptor="(I)%s" %
toMethodArgType) # e.g. "F" for native float
gv.visitVarInsn(Opcodes.ALOAD, 0)
gv.visitFieldInsn(Opcodes.GETFIELD, field["classname"], field["name"],
field["descriptor"])
gv.visitMethodInsn(
Opcodes.INVOKEINTERFACE,
Type.getInternalName(Sampler),
"get",
"()L%s;" %
Type.getInternalName(Object), # isn't this weird? Why Object?
True)
gv.visitTypeInsn(Opcodes.CHECKCAST, Type.getInternalName(fromType))
print Type.getInternalName(fromType), fromMethod, fromMethodReturnType
gv.visitMethodInsn(
Opcodes.INVOKEVIRTUAL,
Type.getInternalName(fromType),
fromMethod, # e.g. getRealFloat
"()%s" % fromMethodReturnType, # e.g. F for native float
False)
# Figure out the return and the loading instructions: primitive or object class
# (NOTE: will not work for array, that starts with '[')
if fromMethodReturnType in ["F", "D"]: # 'F' for float, 'D' for double
ret = fromMethodReturnType + "RETURN"
load = fromMethodReturnType + "LOAD"
elif 'J' == fromMethodReturnType: # 'J' is for long
ret = "LRETURN"
load = "LLOAD"
elif fromMethodReturnType in [
"S", "I", "B", "C", "Z"
]: # 'C': char, 'B': byte, 'Z', boolean, 'S', short, 'I': integer
ret = "IRETURN"
load = "ILOAD"
else:
ret = "ARETURN" # object class
load = "ALOAD"
gv.visitInsn(Opcodes.__getattribute__(
Opcodes, ret)._doget(Opcodes)) # Opcodes.FRETURN: native float return
gv.visitMaxs(1, 2)
gv.visitEnd()
sv = initMethod(facc,
"setValue",
access=Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL,
descriptor="(I%s)V" %
toMethodArgType) # e.g. "F" for native float
sv.visitVarInsn(Opcodes.ALOAD, 0)
sv.visitFieldInsn(Opcodes.GETFIELD, field["classname"], field["name"],
field["descriptor"])
sv.visitMethodInsn(
Opcodes.INVOKEINTERFACE,
Type.getInternalName(Sampler),
"get",
"()L%s;" %
Type.getInternalName(Object), # isn't this weird? Why Object?
True)
sv.visitTypeInsn(Opcodes.CHECKCAST, Type.getInternalName(fromType))
sv.visitVarInsn(
Opcodes.__getattribute__(Opcodes, load)._doget(Opcodes),
2) # e.g. Opcodes.FLOAD
sv.visitMethodInsn(
Opcodes.INVOKEVIRTUAL,
Type.getInternalName(fromType),
toMethod, # e.g. setReal
"(%s)V" % toMethodArgType, # e.g. 'F' for native float
False)
sv.visitInsn(Opcodes.RETURN)
sv.visitMaxs(2, 3)
sv.visitEnd()
# The SamplerConverter outer class
cw = initClass(
classname,
interfaces=[SamplerConverter],
interfaces_parameters={SamplerConverter: [fromType, toType]})
# In the signature, the + sign is for e.g. <? extends UnignedByteType>
# Here, the signature is the same as the descriptor, but with parameter types
# descriptor="(Lnet/imglib2/Sampler;)Lnet/imglib2/type/numeric/real/FloatType;"
# signature="(Lnet/imglib2/Sampler<+Lnet/imglib2/type/numeric/integer/UnsignedByteType;>;)Lnet/imglib2/type/numeric/real/FloatType;",
m = initMethod(
cw,
"convert",
argument_classes=[Sampler],
argument_parameters=[fromType],
argument_prefixes=['+'], # '+' means: <? extends UnsignedByteType>
return_type=toType)
m.visitCode()
m.visitTypeInsn(Opcodes.NEW, Type.getInternalName(toType))
m.visitInsn(Opcodes.DUP)
m.visitTypeInsn(Opcodes.NEW, access_classname)
m.visitInsn(Opcodes.DUP)
m.visitVarInsn(Opcodes.ALOAD, 1)
m.visitMethodInsn(
Opcodes.INVOKESPECIAL, # invoke new
access_classname,
"<init>", # constructor
"(L%s;)V" % Type.getInternalName(Sampler),
False)
m.visitMethodInsn(
Opcodes.
INVOKESPECIAL, # create new toType with the *Access as argument
Type.getInternalName(toType),
"<init>", # constructor
"(L%s;)V" % Type.getInternalName(toAccess),
False)
m.visitInsn(
Opcodes.ARETURN) # ARETURN: return the object at the top of the stack
m.visitMaxs(
5, 2
) # 5 stack slots: the two NEW calls, 1 ALOAD, 2 DUP (I think). And 2 local variables: this, and a method argument.
m.visitEnd()
# If bridge is not defined, the above 'convert' method cannot be invoked: would fail with AbstractMethodException
# To be fair, the TextWriter on the compiled java version of this class did use the bridge.
# The surprising bit is that, in test_asm_class_generation.py, the bridge is not necessary
# even though the class is rather similar overall.
bridge = cw.visitMethod(
Opcodes.ACC_PUBLIC | Opcodes.ACC_VOLATILE | Opcodes.ACC_BRIDGE,
"convert",
"(L%s;)L%s;" % tuple(imap(Type.getInternalName,
(Sampler, Object))), None, None)
bridge.visitCode()
bridge.visitVarInsn(Opcodes.ALOAD, 0)
bridge.visitVarInsn(Opcodes.ALOAD, 1)
bridge.visitMethodInsn(
Opcodes.INVOKEVIRTUAL,
classname,
"convert",
"(L%s;)L%s;" % tuple(imap(Type.getInternalName,
(Sampler, toType))), # descriptor
False)
bridge.visitInsn(Opcodes.ARETURN)
bridge.visitMaxs(2, 2)
bridge.visitEnd()
# Load both classes
loader = CustomClassLoader()
accessClass = loader.defineClass(access_classname, facc.toByteArray())
samplerClass = loader.defineClass(classname, cw.toByteArray())
return samplerClass