Mercurial > lcfOS
annotate python/c3/analyse.py @ 267:e7c8f7eb3f59
Added tag Working chain 1 for changeset 649884d9dc61
| author | Windel Bouwman |
|---|---|
| date | Mon, 12 Aug 2013 20:14:47 +0200 |
| parents | 7416c923a02a |
| children | e64bae57cda8 |
| rev | line source |
|---|---|
| 255 | 1 import logging |
| 163 | 2 from .visitor import Visitor |
| 3 from .astnodes import * | |
| 215 | 4 from .scope import Scope, topScope |
| 231 | 5 from .typecheck import theType |
| 150 | 6 |
| 7 class Analyzer: | |
| 215 | 8 """ |
| 9 Context handling is done here. | |
| 10 Scope is attached to the correct modules. | |
| 11 This class checks names and references | |
| 12 """ | |
| 13 def __init__(self, diag): | |
| 14 self.diag = diag | |
| 255 | 15 self.logger = logging.getLogger('c3') |
| 186 | 16 |
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17 def analyzePackage(self, pkg, packageProvider): |
| 255 | 18 self.logger.info('Checking package {}'.format(pkg.name)) |
| 186 | 19 self.ok = True |
| 215 | 20 visitor = Visitor() |
| 21 # Prepare top level scope: | |
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22 self.scopeStack = [topScope] |
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23 modScope = Scope(self.CurrentScope) |
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24 self.scopeStack.append(modScope) |
| 215 | 25 visitor.visit(pkg, self.enterScope, self.quitScope) |
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26 del self.scopeStack |
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27 |
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28 # Handle imports: |
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29 for i in pkg.imports: |
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30 ip = packageProvider.getPackage(i) |
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31 if not ip: |
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32 self.error('Cannot import {}'.format(i)) |
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33 continue |
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34 for x in ip.declarations: |
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35 modScope.addSymbol(x) |
| 215 | 36 visitor.visit(pkg, self.findRefs) |
| 37 visitor.visit(pkg, self.sanity) | |
| 186 | 38 return self.ok |
| 215 | 39 |
| 40 def error(self, msg, loc=None): | |
| 41 self.ok = False | |
| 42 self.diag.error(msg, loc) | |
| 43 | |
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44 @property |
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45 def CurrentScope(self): |
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46 return self.scopeStack[-1] |
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47 |
| 215 | 48 # Scope creation: |
| 49 def addSymbol(self, sym): | |
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50 if self.CurrentScope.hasSymbol(sym.name): |
| 215 | 51 self.error('Redefinition of {0}'.format(sym.name), sym.loc) |
| 52 else: | |
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53 self.CurrentScope.addSymbol(sym) |
| 215 | 54 |
| 55 def enterScope(self, sym): | |
| 56 # Distribute the scope: | |
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57 sym.scope = self.CurrentScope |
| 215 | 58 |
| 59 # Add symbols to current scope: | |
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60 if isinstance(sym, Symbol) or isinstance(sym, DefinedType): |
| 225 | 61 self.addSymbol(sym) |
| 215 | 62 |
| 63 # Create subscope: | |
| 64 if type(sym) in [Package, Function]: | |
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65 newScope = Scope(self.CurrentScope) |
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66 self.scopeStack.append(newScope) |
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67 sym.innerScope = self.CurrentScope |
| 215 | 68 |
| 69 def quitScope(self, sym): | |
| 70 # Pop out of scope: | |
| 71 if type(sym) in [Package, Function]: | |
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72 self.scopeStack.pop(-1) |
| 150 | 73 |
| 215 | 74 # Reference fixups: |
| 75 def resolveDesignator(self, d, scope): | |
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76 assert type(d) is Designator, type(d) |
| 215 | 77 assert type(scope) is Scope |
| 78 if scope.hasSymbol(d.tname): | |
| 79 s = scope.getSymbol(d.tname) | |
| 80 if hasattr(s, 'addRef'): | |
| 81 # TODO: make this nicer | |
| 82 s.addRef(None) | |
| 83 return s | |
| 84 else: | |
| 85 self.ok = False | |
| 86 msg = 'Cannot resolve name {0}'.format(d.tname) | |
| 87 self.diag.error(msg, d.loc) | |
| 88 | |
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89 def resolveType(self, t, scope): |
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90 # TODO: what about structs? |
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91 if type(t) is PointerType: |
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92 t.ptype = self.resolveType(t.ptype, scope) |
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93 return t |
| 226 | 94 elif type(t) is StructureType: |
| 231 | 95 offset = 0 |
| 226 | 96 for mem in t.mems: |
| 231 | 97 mem.offset = offset |
| 226 | 98 mem.typ = self.resolveType(mem.typ, scope) |
| 231 | 99 offset += theType(mem.typ).bytesize |
| 100 t.bytesize = offset | |
| 226 | 101 return t |
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102 elif type(t) is Designator: |
| 226 | 103 t = self.resolveDesignator(t, scope) |
| 249 | 104 if t: |
| 105 return self.resolveType(t, scope) | |
| 225 | 106 elif isinstance(t, Type): |
| 107 # Already resolved?? | |
| 108 return t | |
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109 else: |
| 225 | 110 raise Exception('Error resolving type {} {}'.format(t, type(t))) |
| 231 | 111 |
| 215 | 112 def findRefs(self, sym): |
| 113 if type(sym) in [Variable, Constant]: | |
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114 sym.typ = self.resolveType(sym.typ, sym.scope) |
| 222 | 115 elif type(sym) is TypeCast: |
| 116 sym.to_type = self.resolveType(sym.to_type, sym.scope) | |
| 215 | 117 elif type(sym) is VariableUse: |
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118 sym.target = self.resolveDesignator(sym.target, sym.scope) |
| 215 | 119 elif type(sym) is FunctionCall: |
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120 varuse = sym.proc |
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121 sym.proc = self.resolveDesignator(varuse.target, sym.scope) |
| 215 | 122 elif type(sym) is Function: |
| 123 # Checkup function type: | |
| 124 ft = sym.typ | |
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125 ft.returntype = self.resolveType(ft.returntype, sym.scope) |
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126 ft.parametertypes = [self.resolveType(pt, sym.scope) for pt in ft.parametertypes] |
| 226 | 127 elif type(sym) is DefinedType: |
| 128 sym.typ = self.resolveType(sym.typ, sym.scope) | |
| 215 | 129 |
| 130 def sanity(self, sym): | |
| 131 if type(sym) is FunctionType: | |
| 132 pass | |
| 133 elif type(sym) is Function: | |
| 134 pass | |
| 135 |