1 #!/usr/bin/env python 2 3 """ 4 RSVP instruction classes. 5 6 Copyright (C) 2007 Paul Boddie <paul@boddie.org.uk> 7 8 This program is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free Software 10 Foundation; either version 3 of the License, or (at your option) any later 11 version. 12 13 This program is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 15 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 16 details. 17 18 You should have received a copy of the GNU General Public License along with 19 this program. If not, see <http://www.gnu.org/licenses/>. 20 """ 21 22 class Instruction: 23 24 "A generic instruction." 25 26 def __init__(self, attr=None): 27 self.attr = attr 28 29 def __repr__(self): 30 if self.attr is not None: 31 return "%s(%r)" % (self.__class__.__name__, self.attr) 32 else: 33 return "%s()" % self.__class__.__name__ 34 35 # Instructions operating on the value stack. 36 37 class LoadConst(Instruction): "Load the constant from the specified location." 38 class Duplicate(Instruction): "Duplicate the top of stack." 39 class Pop(Instruction): "Pop the top of stack." 40 41 # Access within an invocation frame. 42 43 class LoadName(Instruction): "Load the object from the given local attribute/variable." 44 class StoreName(Instruction): "Store the object in the given local attribute/variable." 45 46 # Access to address-relative data. 47 48 class MakeObject(Instruction): "Make a new object." 49 # ... DropObject not defined: Assume garbage collection. 50 class LoadAttr(Instruction): "Load the object from the given attribute." 51 class LoadAttrIndex(Instruction): "Load the object for the attribute with the given index." 52 class StoreAttr(Instruction): "Store an object in the given attribute." 53 class StoreAttrIndex(Instruction): "Store an object in the attribute with the given index." 54 55 # Access to invocation frames in preparation. 56 57 class MakeFrame(Instruction): "Make a new invocation frame." 58 class ReserveFrame(Instruction): "Reserve the given number of entries for the invocation frame." 59 class DropFrame(Instruction): "Drop an invocation frame." 60 class StoreFrame(Instruction): "Store an argument at the given frame location." 61 class StoreFrameIndex(Instruction): "Store an argument for the parameter with the given index." 62 63 # Invocation-related instructions. 64 65 class Jump(Instruction): "Jump unconditionally." 66 class JumpIfFalse(Instruction): "Jump if the last evaluation gave a false result." 67 class JumpIfTrue(Instruction): "Jump if the last evaluation gave a true result." 68 class LoadCallable(Instruction): "Load the target of an invocation." 69 class LoadContext(Instruction): "Load the context of an invocation." 70 class CheckContext(Instruction): "Check the context of an invocation against the target." 71 class RaiseException(Instruction): "Raise an exception." 72 class Return(Instruction): "Return a value from a subprogram." 73 class CheckException(Instruction): "Check the raised exception against another." 74 75 # vim: tabstop=4 expandtab shiftwidth=4