Mercurial > lcfOS
annotate python/c3/analyse.py @ 220:3f6c30a5d234
Major change in expression parsing to enable pointers and structs
| author | Windel Bouwman |
|---|---|
| date | Sat, 06 Jul 2013 21:32:20 +0200 |
| parents | 8b2e5f3cd579 |
| children | c3f1ce8b638f |
| rev | line source |
|---|---|
| 163 | 1 from .visitor import Visitor |
| 2 from .astnodes import * | |
| 215 | 3 from .scope import Scope, topScope |
| 150 | 4 |
| 5 class Analyzer: | |
| 215 | 6 """ |
| 7 Context handling is done here. | |
| 8 Scope is attached to the correct modules. | |
| 9 This class checks names and references | |
| 10 """ | |
| 11 def __init__(self, diag): | |
| 12 self.diag = diag | |
| 186 | 13 |
| 215 | 14 def analyzePackage(self, pkg): |
| 186 | 15 self.ok = True |
| 215 | 16 visitor = Visitor() |
| 17 # Prepare top level scope: | |
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18 self.scopeStack = [topScope] |
| 215 | 19 visitor.visit(pkg, self.enterScope, self.quitScope) |
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20 del self.scopeStack |
| 215 | 21 visitor.visit(pkg, self.findRefs) |
| 22 visitor.visit(pkg, self.sanity) | |
| 186 | 23 return self.ok |
| 215 | 24 |
| 25 def error(self, msg, loc=None): | |
| 26 self.ok = False | |
| 27 self.diag.error(msg, loc) | |
| 28 | |
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29 @property |
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30 def currentScope(self): |
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31 return self.scopeStack[-1] |
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32 |
| 215 | 33 # Scope creation: |
| 34 def addSymbol(self, sym): | |
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35 if self.currentScope.hasSymbol(sym.name): |
| 215 | 36 self.error('Redefinition of {0}'.format(sym.name), sym.loc) |
| 37 else: | |
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38 self.currentScope.addSymbol(sym) |
| 215 | 39 |
| 40 def enterScope(self, sym): | |
| 41 # Distribute the scope: | |
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42 sym.scope = self.currentScope |
| 215 | 43 |
| 44 # Add symbols to current scope: | |
| 45 if isinstance(sym, Symbol): | |
| 46 self.addSymbol(sym) | |
| 47 | |
| 48 # Create subscope: | |
| 49 if type(sym) in [Package, Function]: | |
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50 newScope = Scope(self.currentScope) |
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51 self.scopeStack.append(newScope) |
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52 sym.innerScope = self.currentScope |
| 215 | 53 |
| 54 def quitScope(self, sym): | |
| 55 # Pop out of scope: | |
| 56 if type(sym) in [Package, Function]: | |
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57 self.scopeStack.pop(-1) |
| 150 | 58 |
| 215 | 59 # Reference fixups: |
| 60 def resolveDesignator(self, d, scope): | |
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61 assert type(d) is Designator, type(d) |
| 215 | 62 assert type(scope) is Scope |
| 63 if scope.hasSymbol(d.tname): | |
| 64 s = scope.getSymbol(d.tname) | |
| 65 if hasattr(s, 'addRef'): | |
| 66 # TODO: make this nicer | |
| 67 s.addRef(None) | |
| 68 return s | |
| 69 else: | |
| 70 self.ok = False | |
| 71 msg = 'Cannot resolve name {0}'.format(d.tname) | |
| 72 self.diag.error(msg, d.loc) | |
| 73 | |
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74 def resolveType(self, t, scope): |
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75 # TODO: what about structs? |
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76 if type(t) is PointerType: |
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77 t.ptype = self.resolveType(t.ptype, scope) |
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78 return t |
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79 elif type(t) is Designator: |
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80 return self.resolveDesignator(t, scope) |
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81 else: |
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82 print('ERR resolve type!') |
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83 |
| 215 | 84 def findRefs(self, sym): |
| 85 if type(sym) in [Variable, Constant]: | |
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86 sym.typ = self.resolveType(sym.typ, sym.scope) |
| 215 | 87 elif type(sym) is VariableUse: |
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88 sym.target = self.resolveDesignator(sym.target, sym.scope) |
| 215 | 89 elif type(sym) is FunctionCall: |
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90 varuse = sym.proc |
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91 sym.proc = self.resolveDesignator(varuse.target, sym.scope) |
| 215 | 92 elif type(sym) is Function: |
| 93 # Checkup function type: | |
| 94 ft = sym.typ | |
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95 ft.returntype = self.resolveType(ft.returntype, sym.scope) |
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96 ft.parametertypes = [self.resolveType(pt, sym.scope) for pt in ft.parametertypes] |
| 215 | 97 |
| 98 def sanity(self, sym): | |
| 99 if type(sym) is FunctionType: | |
| 100 pass | |
| 101 elif type(sym) is Function: | |
| 102 pass | |
| 103 |