Mercurial > lcfOS
annotate python/c3/analyse.py @ 235:ff40407c0240
Fix ALabel to Label
| author | Windel Bouwman |
|---|---|
| date | Mon, 15 Jul 2013 17:20:37 +0200 |
| parents | 521567d17388 |
| children | e41e4109addd |
| rev | line source |
|---|---|
| 163 | 1 from .visitor import Visitor |
| 2 from .astnodes import * | |
| 215 | 3 from .scope import Scope, topScope |
| 231 | 4 from .typecheck import theType |
| 150 | 5 |
| 6 class Analyzer: | |
| 215 | 7 """ |
| 8 Context handling is done here. | |
| 9 Scope is attached to the correct modules. | |
| 10 This class checks names and references | |
| 11 """ | |
| 12 def __init__(self, diag): | |
| 13 self.diag = diag | |
| 186 | 14 |
| 215 | 15 def analyzePackage(self, pkg): |
| 186 | 16 self.ok = True |
| 215 | 17 visitor = Visitor() |
| 18 # Prepare top level scope: | |
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19 self.scopeStack = [topScope] |
| 215 | 20 visitor.visit(pkg, self.enterScope, self.quitScope) |
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21 del self.scopeStack |
| 215 | 22 visitor.visit(pkg, self.findRefs) |
| 23 visitor.visit(pkg, self.sanity) | |
| 186 | 24 return self.ok |
| 215 | 25 |
| 26 def error(self, msg, loc=None): | |
| 27 self.ok = False | |
| 28 self.diag.error(msg, loc) | |
| 29 | |
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30 @property |
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31 def currentScope(self): |
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32 return self.scopeStack[-1] |
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33 |
| 215 | 34 # Scope creation: |
| 35 def addSymbol(self, sym): | |
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36 if self.currentScope.hasSymbol(sym.name): |
| 215 | 37 self.error('Redefinition of {0}'.format(sym.name), sym.loc) |
| 38 else: | |
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39 self.currentScope.addSymbol(sym) |
| 215 | 40 |
| 41 def enterScope(self, sym): | |
| 42 # Distribute the scope: | |
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43 sym.scope = self.currentScope |
| 215 | 44 |
| 45 # Add symbols to current scope: | |
| 46 if isinstance(sym, Symbol): | |
| 47 self.addSymbol(sym) | |
| 225 | 48 if isinstance(sym, DefinedType): |
| 49 self.addSymbol(sym) | |
| 215 | 50 |
| 51 # Create subscope: | |
| 52 if type(sym) in [Package, Function]: | |
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53 newScope = Scope(self.currentScope) |
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54 self.scopeStack.append(newScope) |
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55 sym.innerScope = self.currentScope |
| 215 | 56 |
| 57 def quitScope(self, sym): | |
| 58 # Pop out of scope: | |
| 59 if type(sym) in [Package, Function]: | |
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60 self.scopeStack.pop(-1) |
| 150 | 61 |
| 215 | 62 # Reference fixups: |
| 63 def resolveDesignator(self, d, scope): | |
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64 assert type(d) is Designator, type(d) |
| 215 | 65 assert type(scope) is Scope |
| 66 if scope.hasSymbol(d.tname): | |
| 67 s = scope.getSymbol(d.tname) | |
| 68 if hasattr(s, 'addRef'): | |
| 69 # TODO: make this nicer | |
| 70 s.addRef(None) | |
| 71 return s | |
| 72 else: | |
| 73 self.ok = False | |
| 74 msg = 'Cannot resolve name {0}'.format(d.tname) | |
| 75 self.diag.error(msg, d.loc) | |
| 76 | |
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77 def resolveType(self, t, scope): |
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78 # TODO: what about structs? |
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79 if type(t) is PointerType: |
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80 t.ptype = self.resolveType(t.ptype, scope) |
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81 return t |
| 226 | 82 elif type(t) is StructureType: |
| 231 | 83 offset = 0 |
| 226 | 84 for mem in t.mems: |
| 231 | 85 mem.offset = offset |
| 226 | 86 mem.typ = self.resolveType(mem.typ, scope) |
| 231 | 87 offset += theType(mem.typ).bytesize |
| 88 t.bytesize = offset | |
| 226 | 89 return t |
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90 elif type(t) is Designator: |
| 226 | 91 t = self.resolveDesignator(t, scope) |
| 227 | 92 return self.resolveType(t, scope) |
| 225 | 93 elif isinstance(t, Type): |
| 94 # Already resolved?? | |
| 95 return t | |
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96 else: |
| 225 | 97 raise Exception('Error resolving type {} {}'.format(t, type(t))) |
| 231 | 98 |
| 215 | 99 def findRefs(self, sym): |
| 100 if type(sym) in [Variable, Constant]: | |
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101 sym.typ = self.resolveType(sym.typ, sym.scope) |
| 222 | 102 elif type(sym) is TypeCast: |
| 103 sym.to_type = self.resolveType(sym.to_type, sym.scope) | |
| 215 | 104 elif type(sym) is VariableUse: |
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105 sym.target = self.resolveDesignator(sym.target, sym.scope) |
| 215 | 106 elif type(sym) is FunctionCall: |
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107 varuse = sym.proc |
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108 sym.proc = self.resolveDesignator(varuse.target, sym.scope) |
| 215 | 109 elif type(sym) is Function: |
| 110 # Checkup function type: | |
| 111 ft = sym.typ | |
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112 ft.returntype = self.resolveType(ft.returntype, sym.scope) |
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113 ft.parametertypes = [self.resolveType(pt, sym.scope) for pt in ft.parametertypes] |
| 226 | 114 elif type(sym) is DefinedType: |
| 115 sym.typ = self.resolveType(sym.typ, sym.scope) | |
| 215 | 116 |
| 117 def sanity(self, sym): | |
| 118 if type(sym) is FunctionType: | |
| 119 pass | |
| 120 elif type(sym) is Function: | |
| 121 pass | |
| 122 |