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307
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1 from .astnodes import Constant, Variable, Function, BaseType, Symbol
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354
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2 from .astnodes import ArrayType, StructureType, DefinedType, PointerType
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3 from .astnodes import StructField
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150
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4
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288
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5
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150
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6 class Scope:
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306
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7 """ A scope contains all symbols in a scope. It also has a parent scope,
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8 when looking for a symbol, also the parent scopes are checked. """
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217
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9 def __init__(self, parent=None):
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10 self.symbols = {}
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11 self.parent = parent
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12
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13 def __iter__(self):
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272
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14 # Iterate in a deterministic manner:
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15 return iter(self.Constants + self.Variables + self.Functions)
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217
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16
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17 @property
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18 def Syms(self):
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19 syms = self.symbols.values()
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20 return sorted(syms, key=lambda v: v.name)
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21
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22 @property
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23 def Constants(self):
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306
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24 return [s for s in self.Syms if type(s) is Constant]
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217
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25
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26 @property
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27 def Variables(self):
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306
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28 return [s for s in self.Syms if isinstance(s, Variable)]
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217
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29
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30 @property
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31 def Functions(self):
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306
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32 return [s for s in self.Syms if type(s) is Function]
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217
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33
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34 def getSymbol(self, name):
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272
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35 if name in self.symbols:
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36 return self.symbols[name]
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37 # Look for symbol:
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306
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38 elif self.parent:
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272
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39 return self.parent.getSymbol(name)
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306
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40 else:
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41 raise KeyError(name)
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42
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43 def __getitem__(self, key):
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44 return self.getSymbol(key)
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217
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45
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46 def hasSymbol(self, name):
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272
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47 if name in self.symbols:
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48 return True
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306
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49 elif self.parent:
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272
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50 return self.parent.hasSymbol(name)
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306
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51 else:
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52 return False
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53
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54 def __contains__(self, name):
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55 return self.hasSymbol(name)
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217
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56
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57 def addSymbol(self, sym):
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306
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58 assert sym.name not in self.symbols
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307
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59 assert isinstance(sym, Symbol)
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272
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60 self.symbols[sym.name] = sym
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150
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61
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217
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62 def __repr__(self):
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63 return 'Scope with {} symbols'.format(len(self.symbols))
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64
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272
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65
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306
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66 def createTopScope(target):
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67 scope = Scope()
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288
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68 for tn in ['u64', 'u32', 'u16', 'u8']:
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306
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69 scope.addSymbol(BaseType(tn))
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70 # buildin types:
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71 intType = BaseType('int')
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72 intType.bytesize = target.byte_sizes['int']
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73 scope.addSymbol(intType)
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74 scope.addSymbol(BaseType('double'))
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75 scope.addSymbol(BaseType('void'))
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76 scope.addSymbol(BaseType('bool'))
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354
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77 byteType = BaseType('byte')
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78 byteType.bytesize = target.byte_sizes['byte']
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79 scope.addSymbol(byteType)
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80
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81 # Construct string type from others:
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82 ln = StructField('len', intType)
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83 txt = StructField('txt', ArrayType(byteType, 0))
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84 strType = DefinedType('string', PointerType(StructureType([ln, txt])), None)
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85 scope.addSymbol(strType)
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306
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86 return scope
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