""" Nodes describe Java structures that we are building. They know how to render themselves so as to build the java structure they describe. They are entered onto the database worklist as we go. Some nodes describe parts of the JVM structure that already exist --- for example, there are nodes that are used to describe built-in JVM types like String, etc. In this case, they are never placed on the database worklist, and don't know how to render themselves (since they don't have to). Nodes representing classes that we will build also implement the JvmType interface defined by database.JvmType. """ from pypy.objspace.flow import \ model as flowmodel from pypy.rpython.lltypesystem import \ lltype from pypy.rpython.ootypesystem import \ ootype, rclass from pypy.translator.jvm.typesystem import \ JvmGeneratedClassType, jString, jStringArray, jVoid, jThrowable, jInt, \ jObject, JvmType, jStringBuilder, jPyPyInterlink, jCallbackInterfaces, \ JvmGeneratedInterfaceType, jPyPy, jPyPyAbstractMethodException, \ jPyPyThrowable, OBJECTGETCLASS from pypy.translator.jvm.opcodes import \ opcodes from pypy.translator.jvm.option import \ getoption from pypy.translator.jvm.methods import \ BaseDumpMethod, InstanceDumpMethod, RecordDumpMethod, \ ConstantStringDumpMethod from pypy.translator.oosupport.function import \ Function as OOFunction from pypy.translator.oosupport.constant import \ push_constant from pypy.translator.oosupport.treebuilder import \ SubOperation from pypy.translator.jvm.cmpopcodes import \ can_branch_directly, branch_if import pypy.translator.jvm.typesystem as jvm import pypy.translator.jvm.typesystem as jvmtype from pypy.translator.jvm.log import log class Node(object): def set_db(self, db): self.db = db def dependencies(self): pass class EntryPoint(Node): """ A special node that generates the pypy.Main class which has a static main method. Can be configured with a number of options for internal testing (see __init__) """ def __init__(self, graph, expandargs, printresult): """ 'graph' --- The initial graph to invoke from main() 'expandargs' --- controls whether the arguments passed to main() are passed as a list, or expanded to match each argument to the graph 'printresult' --- controls whether the result is printed to stdout when the program finishes The 'expandargs' option deserves explanation: it will be false for a standalone build, because in that case we want to convert the String[] array that main() receives into a corresponding python List of string objects. it will (generally) be true when compiling individual functions, in which case we might be compiling an entry point with a signature like (a:int,b:float) in which case argv[1] should be converted to an integer, and argv[2] should be converted to a float. """ self.graph = graph self.expand_arguments = expandargs self.print_result = printresult pass # XXX --- perhaps this table would be better placed in typesystem.py # so as to constrain the knowledge of lltype and ootype _type_conversion_methods = { ootype.Signed:jvm.PYPYSTRTOINT, ootype.Unsigned:jvm.PYPYSTRTOUINT, lltype.SignedLongLong:jvm.PYPYSTRTOLONG, lltype.UnsignedLongLong:jvm.PYPYSTRTOULONG, ootype.Bool:jvm.PYPYSTRTOBOOL, ootype.Float:jvm.PYPYSTRTODOUBLE, ootype.Char:jvm.PYPYSTRTOCHAR, ootype.UniChar:jvm.PYPYSTRTOCHAR, ootype.String:None } def render(self, gen): gen.begin_class(gen.db.jPyPyMain, jObject) gen.add_field(gen.db.pypy_field) gen.add_field(gen.db.interlink_field) # Initialization: # # 1. Create an Interlink instance and a PyPy helper class, and # store them in the appropriate static fields. # # 2. Run the initialization method for the constant class. # gen.begin_function('', (), [], jVoid, static=True) gen.emit(jvm.NEW, jPyPy) gen.emit(jvm.DUP) gen.new_with_jtype(gen.db.jInterlinkImplementation) gen.emit(jvm.DUP) gen.db.interlink_field.store(gen) gen.emit(jvm.Method.c(jPyPy, [jPyPyInterlink])) gen.db.pypy_field.store(gen) gen.db.constant_generator.runtime_init(gen) gen.return_val(jVoid) gen.end_function() # Main method: # # 1. Parse the arguments and create Python objects. # 2. Invoke the main function. # 3. Print the result to stdout if self.print_result is true # gen.begin_function( 'main', (), [jStringArray], jVoid, static=True) if self.print_result: gen.begin_try() # Handle arguments: if self.expand_arguments: # Convert each entry into the array to the desired type by # invoking an appropriate helper function on each one for i, arg in enumerate(self.graph.getargs()): jty = self.db.lltype_to_cts(arg.concretetype) conv = self._type_conversion_methods[arg.concretetype] if conv: gen.push_pypy() gen.load_jvm_var(jStringArray, 0) gen.emit(jvm.ICONST, i) gen.load_from_array(jString) if conv: gen.emit(conv) else: # Convert the array of strings to a List as the # python method expects arg0 = self.graph.getargs()[0] assert isinstance(arg0.concretetype, ootype.List), str(arg0.concretetype) assert arg0.concretetype.ITEM is ootype.String gen.load_jvm_var(jStringArray, 0) gen.emit(jvm.PYPYARRAYTOLIST) # Generate a call to this method gen.emit(self.db.pending_function(self.graph)) # Print result? # # Use the dump method for non-exceptional results # # For exceptions, just print the runtime type # if self.print_result: done_printing = gen.unique_label('done_printing') RESOOTYPE = self.graph.getreturnvar().concretetype dumpmethod = self.db.toString_method_for_ootype(RESOOTYPE) gen.add_comment('Invoking dump method for result of type ' +str(RESOOTYPE)) gen.emit(dumpmethod) # generate the string gen.emit(jvm.PYPYDUMP) # dump to stdout gen.goto(done_printing) gen.end_try() gen.begin_catch(jPyPyThrowable) gen.emit(jvm.PYPYDUMPEXCWRAPPER) # dumps to stdout gen.end_catch() gen.mark(done_printing) # And finish up gen.return_val(jVoid) gen.end_function() gen.end_class() class Function(object): """ A generic interface for Function objects; these objects can be added as methods of classes and rendered. This class serves only as documentation. """ # A "name" attribute must be defined name = None def render(self, gen): """ Uses the gen argument, a jvm.Generator, to create the appropriate JVM assembly for this method. """ raise NotImplementedError def method(self): """ Returns a jvm.Method object that would allow this function to be invoked. """ raise NotImplementedError class GetterFunction(Function): def __init__(self, db, cls_obj, method_obj, field_obj): self.db = db self.name = method_obj.method_name self.cls_obj = cls_obj self.method_obj = method_obj self.field_obj = field_obj def method(self): return self.method_obj def render(self, gen): gen.begin_function( self.method_obj.method_name, [], [self.cls_obj], self.field_obj.jtype) gen.load_this_ptr() self.field_obj.load(gen) gen.return_val(self.field_obj.jtype) gen.end_function() class PutterFunction(Function): def __init__(self, db, cls_obj, method_obj, field_obj): self.db = db self.cls_obj = cls_obj self.method_obj = method_obj self.field_obj = field_obj def method(self): return self.method_obj def render(self, gen): gen.begin_function( self.method_obj.method_name, [], [self.cls_obj, self.field_obj.jtype], jVoid) gen.load_this_ptr() gen.load_function_argument(1) self.field_obj.store(gen) gen.return_val(jVoid) gen.end_function() class GraphFunction(OOFunction, Function): """ Represents a function that is generated from a graph. """ is_final = False def __init__(self, db, classty, name, jargtypes, jrettype, graph, is_static): """ classty: the JvmClassType object this is a part of (even static functions have a class) name: the name of the function jargtypes: JvmType of each argument jrettype: JvmType this function returns graph: the graph representing the body of the function is_static: boolean flag indicate whether func is static (!) """ OOFunction.__init__(self, db, graph, name, not is_static) self.classty = classty self.jargtypes = jargtypes self.jrettype = jrettype self._block_labels = {} def next_label(self, prefix='label'): return self.generator.unique_label(prefix) def method(self): """ Returns a jvm.Method that can invoke this function """ if not self.is_method: ctor = jvm.Method.s startidx = 0 else: ctor = jvm.Method.v startidx = 1 return ctor(self.classty, self.name, self.jargtypes[startidx:], self.jrettype) def begin_render(self): # Prepare argument lists for begin_function call lltype_to_cts = self.db.lltype_to_cts jargvars = [] jargtypes = [] for arg in self.graph.getargs(): if arg.concretetype is ootype.Void: continue jargvars.append(arg) jargtypes.append(lltype_to_cts(arg.concretetype)) # Determine return type jrettype = lltype_to_cts(self.graph.getreturnvar().concretetype) self.ilasm.begin_function( self.name, jargvars, jargtypes, jrettype, static=not self.is_method, final=self.is_final) def end_render(self): self.ilasm.end_function() def _create_generator(self, ilasm): # JVM doesn't distinguish return ilasm def _get_block_name(self, block): if block in self._block_labels: return self._block_labels[block] blocklbl = self.ilasm.unique_label('BasicBlock') self._block_labels[block] = blocklbl return blocklbl def set_label(self, blocklbl): self.ilasm.mark(blocklbl) def begin_try(self, cond): if cond: self.ilasm.begin_try() def end_try(self, exit_label, cond): self.ilasm.branch_unconditionally(exit_label) if cond: self.ilasm.end_try() def introduce_exception_conversions(self, llexitcases): # These are exceptions thrown internally by the JVM. # If the user is catching an RPython exception that corresponds # to one of these cases, we introduce a translation block which # catches the corresponding JVM exception and re-throwns the # RPython one. A better solution would be to find a way to # make the RPython class the same as the JVM class, but that is # currently hindered by the presence of a few fields (meta) on # the Object class. translation_table = [ (ZeroDivisionError, jvmtype.jArithmeticException), (RuntimeError, jvmtype.jStackOverflowError), (MemoryError, jvmtype.jOutOfMemoryError), ] for pyexccls, jexcty in translation_table: for llexitcase in llexitcases: # llexitcase is an exception class, like ZeroDivisionError if issubclass(llexitcase, pyexccls): # Generate some converter code like: # try { ... } # catch (OutOfStackError e) { # jPyPyMain.ilink.throwRuntimeError(); # throw null; # } # The "throw null" will never execute, it's just # there to make the verifier happy, since it doesn't # realize that Interlink's throwXyzError() methods # never return. At the end we invoke end_try() again # so as to extend the encompassing try/catch region # to include this code, thus allowing the RPython # exception to be caught by the normal handlers. self.ilasm.begin_catch(jexcty) self.ilasm.push_interlink() interlink_method = jvm.Method.v( jPyPyInterlink, "throw"+pyexccls.__name__, [], jVoid) self.ilasm.emit(interlink_method) self.ilasm.emit(jvm.ACONST_NULL) # "inform" the verifier... self.ilasm.emit(jvm.ATHROW) # ...that we throw here self.ilasm.end_try() def begin_catch(self, llexitcase): ll_meta_exc = llexitcase ll_exc = ll_meta_exc._INSTANCE jtype = self.cts.lltype_to_cts(ll_exc) assert jtype.throwable # SHOULD only try to catch subtypes of Exception self.ilasm.begin_catch(jtype) def end_catch(self, exit_lbl): self.ilasm.goto(exit_lbl) self.ilasm.end_catch() def store_exception_and_link(self, link): if self._is_raise_block(link.target): # the exception value is on the stack, use it as the 2nd target arg assert len(link.args) == 2 assert len(link.target.inputargs) == 2 self.ilasm.store(link.target.inputargs[1]) else: # the exception value is on the stack, store it in the proper place if isinstance(link.last_exception, flowmodel.Variable): # if the code that follows is interested in the class # of the exception, extract it self.ilasm.dup_jtype(jPyPyThrowable) self.ilasm.store(link.last_exc_value) self.ilasm.emit(OBJECTGETCLASS) self.ilasm.store(link.last_exception) else: self.ilasm.store(link.last_exc_value) self._setup_link(link) def render_normal_block(self, block): """ Overload OOFunction.render_normal_block: we intercept blocks where the exitcase tests a bool variable with one use so as to generate more efficient code. For example, the naive code generation for a test like 'if x < y' yields something like: push x push y jump_if_less_than true false: push 0 jump done true: push 1 done: store_into_local_var load_from_local_var jump_if_true true_destination jump false_destination when it could (should) be push x push y jump_if_less_than true_destination jump false_destination """ def not_in_link_args(v): for link in block.exits: if v in link.args: return False return True def true_false_exits(): if block.exits[0].exitcase: return block.exits[0], block.exits[1] return block.exits[1], block.exits[0] if block.operations: # Look for a case where the block switches on a bool variable # which is produced by the last operation and not used # anywhere else, and where the last operation is a comparison. # Watch out for a last operation like: # v1 = same_as([int_lt(i, j)]) last_op = block.operations[-1] while (last_op.opname == "same_as" and isinstance(last_op.args[0], SubOperation)): last_op = last_op.args[0].op if (block.exitswitch is not None and block.exitswitch.concretetype is ootype.Bool and block.operations[-1].result is block.exitswitch and can_branch_directly(last_op.opname) and not_in_link_args(block.exitswitch)): self.generator.add_comment( "short-circuit final comparison on %s, block has %d ops" % ( block.exitswitch, len(block.operations))) for op in block.operations[:-1]: self._render_op(op) self.generator.add_comment( "inlining comparison: %r" % (last_op),) for arg in last_op.args: self.ilasm.load(arg) truelink, falselink = true_false_exits() true_label = self.next_label('link_true') branch_if(self.ilasm, last_op.opname, true_label) self._follow_link(falselink) self.set_label(true_label) self._follow_link(truelink) return return OOFunction.render_normal_block(self, block) def render_numeric_switch(self, block): if block.exitswitch.concretetype in (ootype.SignedLongLong, ootype.UnsignedLongLong): # TODO: it could be faster to check is the values fit in # 32bit, and perform a cast in that case self.render_numeric_switch_naive(block) return cases, min_case, max_case, default = self._collect_switch_cases(block) is_sparse = self._is_sparse_switch(cases, min_case, max_case) if is_sparse: log.WARNING('TODO: use lookupswitch to render sparse numeric_switches') self.render_numeric_switch_naive(block) return targets = [] for i in xrange(min_case, max_case+1): link, lbl = cases.get(i, default) targets.append(lbl) self.generator.load(block.exitswitch) self.generator.emit_tableswitch(min_case, targets, default[1]) self.render_switch_case(*default) for link, lbl in cases.itervalues(): self.render_switch_case(link, lbl) def render_return_block(self, block): return_var = block.inputargs[0] return_ty = self.db.lltype_to_cts(return_var.concretetype) if return_var.concretetype is not ootype.Void: self.ilasm.load(return_var) self.ilasm.return_val(return_ty) def render_raise_block(self, block): exc = block.inputargs[1] self.ilasm.load(exc) # Check whether the static type is known to be throwable. # If not, emit a CHECKCAST to throwable. # According to Samuele, no non-Exceptions should be thrown, # but this is not enforced by the RTyper or annotator. jtype = self.db.lltype_to_cts(exc.concretetype) if not jtype.throwable: self.ilasm.downcast_jtype(jThrowable) self.ilasm.throw() def _trace(self, str, writeline=False): if writeline: str += '\n' jvm.SYSTEMERR.load(self.generator) self.generator.load_string(str) jvm.PRINTSTREAMPRINTSTR.invoke(self.generator) def _is_printable(self, res): if res.concretetype in ( ootype.Instance, ootype.Signed, ootype.Unsigned, ootype.SignedLongLong, ootype.UnsignedLongLong, ootype.Bool, ootype.Float, ootype.Char, ootype.UniChar, ootype.String, ootype.StringBuilder, ootype.Class): return True if isinstance(res.concretetype, ( ootype.Instance, ootype.Record, ootype.List, ootype.Dict, ootype.DictItemsIterator)): return True return False def _trace_value(self, prompt, res): if res and self._is_printable(res): jmethod = self.db.toString_method_for_ootype( res.concretetype) self._trace(" "+prompt+": ") self.generator.emit(jvm.SYSTEMERR) self.generator.load(res) self.generator.emit(jmethod) self.generator.emit(jvm.PRINTSTREAMPRINTSTR) self._trace("\n") def _trace_enabled(self): return getoption('trace') def _render_op(self, op): self.generator.add_comment(str(op)) OOFunction._render_op(self, op) class StaticMethodInterface(Node, JvmGeneratedClassType): """ We generate an abstract base class when we need function pointers, which correspond to constants of StaticMethod ootype. We need a different interface for each different set of argument/return types. These abstract base classes look like: abstract class Foo { public abstract ReturnType invoke(Arg1, Arg2, ...); } Depending on the signature of Arg1, Arg2, and ReturnType, this abstract class may have additional methods and may implement interfaces such as PyPy.Equals or PyPy.HashCode. This is to allow it to interface with the the standalone Java code. See the pypy.Callback interface for more information. """ def __init__(self, name, jargtypes, jrettype): """ argtypes: list of JvmTypes rettype: JvmType """ JvmGeneratedClassType.__init__(self, name) assert isinstance(jrettype, JvmType) self.java_argument_types = [self] + list(jargtypes) self.java_return_type = jrettype self.dump_method = ConstantStringDumpMethod( self, "StaticMethodInterface") self.invoke_method_obj = jvm.Method.v( self, 'invoke', self.java_argument_types[1:], self.java_return_type) def lookup_field(self, fieldnm): raise KeyError(fieldnm) # no fields def lookup_method(self, methodnm): """ Given the method name, returns a jvm.Method object """ assert isinstance(self.java_return_type, JvmType) if methodnm == 'invoke': return self.invoke_method_obj raise KeyError(methodnm) # only one method def render(self, gen): assert isinstance(self.java_return_type, JvmType) # Scan through the jCallbackInterfaces and look for any # that apply. for jci in jCallbackInterfaces: if jci.matches(self.java_argument_types[1:], self.java_return_type): break else: jci = None gen.begin_class(self, jObject, abstract=True) if jci: gen.implements(jci) gen.begin_constructor() gen.end_constructor() gen.begin_function('invoke', [], self.java_argument_types, self.java_return_type, abstract=True) gen.end_function() # Because methods in the JVM are identified by both their name # and static signature, we need to create a dummy "invoke" # method if the Java callback interface argument types don't # match the actual types for this method. For example, the # equals interface has the static signature # "(Object,Object)=>boolean", but there may be static methods # with some signature "(X,Y)=>boolean" where X and Y are other # types. In that case, we create an adaptor method like: # # boolean invoke(Object x, Object y) { # return invoke((X)x, (Y)y); # } if (jci and (jci.java_argument_types != self.java_argument_types[1:] or jci.java_return_type != self.java_return_type)): jci_jargs = [self] + list(jci.java_argument_types) jci_ret = jci.java_return_type gen.begin_function('invoke', [], jci_jargs, jci_ret) idx = 0 for jci_arg, self_arg in zip(jci_jargs, self.java_argument_types): gen.load_jvm_var(jci_arg, idx) if jci_arg != self_arg: gen.prepare_generic_result_with_jtype(self_arg) idx += jci_arg.descriptor.type_width() gen.emit(self.invoke_method_obj) assert jci_ret == self.java_return_type # no variance here currently gen.return_val(jci_ret) gen.end_function() gen.end_class() class StaticMethodImplementation(Node, JvmGeneratedClassType): """ In addition to the StaticMethodInterface, we must generate an implementation for each specific method that is called. These implementation objects look like: class Bar extends Foo { public ReturnType invoke(Arg1, Arg2) { return SomeStaticClass.StaticMethod(Arg1, Arg2); } } If the bound_to_jty argument is not None, then this class represents a bound method, and looks something like: class Bar extends Foo { Qux bound_to; public static Bar bind(Qux to) { Bar b = new Bar(); b.bound_to = to; return b; } public ReturnType invoke(Arg1, Arg2) { return bound_to.SomeMethod(Arg1, Arg2); } } """ def __init__(self, name, super_class, bound_to_jty, impl_method): JvmGeneratedClassType.__init__(self, name) self.super_class = super_class self.impl_method = impl_method self.dump_method = ConstantStringDumpMethod( self, "StaticMethodImplementation") if bound_to_jty: self.bound_to_jty = bound_to_jty self.bound_to_fld = jvm.Field( self.name, 'bound_to', bound_to_jty, False) self.bind_method = jvm.Method.s( self, 'bind', (self.bound_to_jty,), self) else: self.bound_to_jty = None self.bound_to_fld = None self.bind_method = None def lookup_field(self, fieldnm): if self.bound_to_fld and fieldnm == self.bound_to_fld.name: return self.bound_to_fld return self.super_class.lookup_field(fieldnm) def lookup_method(self, methodnm): if self.bind_method and methodnm == 'bind': return self.bind_method return self.super_class.lookup_method(methodnm) def render(self, gen): gen.begin_class(self, self.super_class) if self.bound_to_fld: gen.add_field(self.bound_to_fld) gen.begin_constructor() gen.end_constructor() # Emit the "bind" function which creates an instance if there is # a bound field: if self.bound_to_jty: assert self.bound_to_fld and self.bind_method gen.begin_function( 'bind', [], (self.bound_to_jty,), self, static=True) gen.new_with_jtype(self) gen.emit(jvm.DUP) gen.load_jvm_var(self.bound_to_jty, 0) self.bound_to_fld.store(gen) gen.return_val(self) gen.end_function() # Emit the invoke() function, which just re-pushes the # arguments and then invokes either the (possibly static) # method self.impl_method. Note that if we are bound to an # instance, we push that as the this pointer for # self.impl_method. gen.begin_function('invoke', [], self.super_class.java_argument_types, self.super_class.java_return_type) if self.bound_to_fld: gen.load_jvm_var(self, 0) gen.emit(self.bound_to_fld) for i in range(len(self.super_class.java_argument_types)): if not i: continue # skip the this ptr gen.load_function_argument(i) gen.emit(self.impl_method) gen.return_val(self.super_class.java_return_type) gen.end_function() gen.end_class() class Interface(Node, JvmGeneratedInterfaceType): """ Represents an interface to be generated. The only class that we currently generate into an interface is ootype.ROOT. """ def __init__(self, name): JvmGeneratedInterfaceType.__init__(self, name) self.super_class = jObject self.rendered = False self.properties = {} self.methods = {} def lookup_field(self, fieldnm): # Right now, we don't need inheritance between interfaces. return self.properties[fieldnm] def lookup_method(self, methodnm): # Right now, we don't need inheritance between interfaces. return self.methods[methodnm] def add_property(self, prop): self.properties[prop.field_name] = prop def add_method(self, method): self.methods[method.name] = method def render(self, gen): self.rendered = True gen.begin_class(self, self.super_class, interface=True) def emit_method(method): gen.begin_j_function(self, method, abstract=True) gen.end_function() for method in self.methods.values(): emit_method(method) for prop in self.properties.values(): emit_method(prop.get_method) emit_method(prop.put_method) gen.end_class() class Class(Node, JvmGeneratedClassType): """ Represents a class to be emitted. Note that currently, classes are emitted all in one shot, not piecemeal. """ def __init__(self, name, supercls=None): """ 'name' should be a fully qualified Java class name like "java.lang.String", supercls is a Class object """ JvmGeneratedClassType.__init__(self, name) self.rendered = False # has rendering occurred? self.fields = {} # maps field name to jvm.Field object self.interfaces = [] # list of JvmTypes self.methods = {} # maps method name to a Function object* self.abstract_methods = {} # maps method name to jvm.Method object self.set_super_class(supercls) # * --- actually maps to an object that defines the # attributes: name, method() and render(). Usually, this is a # Function object, but in some subclasses it is not. def simple_name(self): dot = self.name.rfind('.') if dot == -1: return self.name return self.name[dot+1:] def set_super_class(self, supercls): self.super_class = supercls # Throwability is inherited: if self.super_class and self.super_class.throwable: self.throwable = True def add_field(self, fieldobj, fielddef): """ Creates a new field accessed via the jvm.Field descriptor 'fieldobj'. Must be called before render().""" assert not self.rendered and isinstance(fieldobj, jvm.Field) self.fields[fieldobj.field_name] = (fieldobj, fielddef) def add_interface(self, inter): assert not self.rendered and isinstance(inter, JvmType) self.interfaces.append(inter) def lookup_field(self, fieldnm): if fieldnm in self.fields: return self.fields[fieldnm][0] return self.super_class.lookup_field(fieldnm) def lookup_method(self, methodnm): """ Given the method name, returns a jvm.Method object """ if methodnm in self.methods: return self.methods[methodnm].method() if methodnm in self.abstract_methods: return self.abstract_methods[methodnm] return self.super_class.lookup_method(methodnm) def add_method(self, func): """ Creates a new method in this class, represented by the Function object 'func'. Must be called before render(); intended to be invoked by the database. Note that some of these 'methods' may actually represent static functions. """ self.methods[func.name] = func def add_abstract_method(self, jmethod): """ Adds an abstract method to our list of methods; jmethod should be a jvm.Method object """ assert jmethod.method_name not in self.methods self.abstract_methods[jmethod.method_name] = jmethod def render(self, gen): self.rendered = True gen.begin_class(self, self.super_class) for inter in self.interfaces: gen.implements(inter) for field, fielddef in self.fields.values(): gen.add_field(field) # Emit the constructor: gen.begin_constructor() # set default values for fields for field, f_default in self.fields.values(): if field.jtype is not jVoid: gen.load_jvm_var(self, 0) # load this ptr # load default value of field push_constant(gen.db, field.OOTYPE, f_default, gen) field.store(gen) # store value into field gen.end_constructor() for method in self.methods.values(): method.render(gen) for method in self.abstract_methods.values(): gen.begin_j_function(self, method) gen.new_with_jtype(jPyPyAbstractMethodException) gen.throw() gen.end_function() gen.end_class() class InterlinkFunction(Function): """ Used for methods of the interlink helper class that we generate. Generates a method which takes no arguments and which invokes a given static helper function. """ def __init__(self, interlink, name, helper): """ interlink: the JvmType of the Interlink implementation name: the name of the method helper: a jvm.Method object for the helper func we should invoke """ self.interlink = interlink self.name = name self.helper = helper # Since the names of classes we generate are not statically # known, the functions in Interlink.java simply return # Object when they create an instance of one of those types. if self.helper.return_type.is_generated(): self.return_type = jObject else: self.return_type = self.helper.return_type self.method_obj = jvm.Method.v(interlink, self.name, self.helper.argument_types, self.return_type) def method(self): return self.method_obj def render(self, gen): argtypes = [self.interlink] + list(self.helper.argument_types) gen.begin_function(self.name, (), argtypes, self.return_type) varindex = 1 for argty in self.helper.argument_types: gen.load_jvm_var(argty, varindex) varindex += argty.descriptor.type_width() gen.emit(self.helper) gen.return_val(self.return_type) gen.end_function()