Mercurial > lcfOS
annotate python/c3/typecheck.py @ 225:1c7364bd74c7
Fixed pointer deref
| author | Windel Bouwman |
|---|---|
| date | Thu, 11 Jul 2013 07:42:30 +0200 |
| parents | c3f1ce8b638f |
| children | 240111e0456f |
| rev | line source |
|---|---|
| 163 | 1 from .astnodes import * |
| 2 from .scope import * | |
| 3 from .visitor import Visitor | |
| 4 | |
| 5 def equalTypes(a, b): | |
| 6 """ Compare types a and b for equality. Not equal until proven otherwise. """ | |
| 7 if type(a) is type(b): | |
| 8 if type(a) is BaseType: | |
| 9 return a.name == b.name | |
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10 elif type(a) is PointerType: |
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11 return equalTypes(a.ptype, b.ptype) |
| 163 | 12 return False |
| 150 | 13 |
| 222 | 14 def canCast(fromT, toT): |
| 15 if isinstance(fromT, PointerType) and isinstance(toT, PointerType): | |
| 16 return True | |
| 17 elif fromT is intType and isinstance(toT, PointerType): | |
| 18 return True | |
| 19 return False | |
| 20 | |
| 150 | 21 class TypeChecker: |
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22 def __init__(self, diag): |
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23 self.diag = diag |
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24 |
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25 def error(self, msg, loc): |
| 186 | 26 """ Wrapper that registers the message and marks the result invalid """ |
| 27 self.diag.error(msg, loc) | |
| 28 self.ok = False | |
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29 |
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30 def checkPackage(self, pkg): |
| 186 | 31 self.ok = True |
| 215 | 32 visitor = Visitor() |
| 33 visitor.visit(pkg, f_post=self.check2) | |
| 186 | 34 return self.ok |
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35 |
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36 def check2(self, sym): |
| 225 | 37 if type(sym) in [IfStatement, WhileStatement]: |
| 38 if not equalTypes(sym.condition.typ, boolType): | |
| 39 self.error('Condition must be of type {0}'.format(boolType), sym.condition.loc) | |
| 40 elif type(sym) is Assignment: | |
| 221 | 41 if not equalTypes(sym.lval.typ, sym.rval.typ): |
| 42 self.error('Cannot assign {0} to {1}'.format(sym.rval.typ, sym.lval.typ), sym.loc) | |
| 43 if not sym.lval.lvalue: | |
| 44 self.error('No valid lvalue {}'.format(sym.lval), sym.lval.loc) | |
| 45 #if sym.rval.lvalue: | |
| 46 # self.error('Right hand side must be an rvalue', sym.rval.loc) | |
| 225 | 47 elif type(sym) is ReturnStatement: |
| 48 pass | |
| 49 elif type(sym) is FunctionCall: | |
| 166 | 50 if sym.proc: |
| 167 | 51 # Check arguments: |
| 52 ngiv = len(sym.args) | |
| 53 ptypes = sym.proc.typ.parametertypes | |
| 54 nreq = len(ptypes) | |
| 55 if ngiv != nreq: | |
| 186 | 56 self.error('Function {2}: {0} arguments required, {1} given'.format(nreq, ngiv, sym.proc.name), sym.loc) |
| 167 | 57 else: |
| 58 for a, at in zip(sym.args, ptypes): | |
| 59 if not equalTypes(a.typ, at): | |
| 186 | 60 self.error('Got {0}, expected {1}'.format(a.typ, at), a.loc) |
| 167 | 61 # determine return type: |
| 62 sym.typ = sym.proc.typ.returntype | |
| 63 else: | |
| 64 sym.typ = intType | |
| 225 | 65 elif type(sym) is VariableUse: |
| 221 | 66 sym.lvalue = True |
| 225 | 67 if type(sym.target) is Variable: |
| 221 | 68 sym.typ = sym.target.typ |
| 69 else: | |
| 225 | 70 print('warning {} has no target, defaulting to int'.format(sym)) |
| 221 | 71 sym.typ = intType |
| 225 | 72 elif type(sym) is Literal: |
| 221 | 73 sym.lvalue = False |
| 74 if type(sym.val) is int: | |
| 75 sym.typ = intType | |
| 76 elif type(sym.val) is float: | |
| 77 sym.typ = doubleType | |
| 78 elif type(sym.val) is bool: | |
| 79 sym.typ = boolType | |
| 80 else: | |
| 225 | 81 raise Exception('Unknown literal type'.format(sym.val)) |
| 82 elif type(sym) is Unop: | |
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83 if sym.op == '&': |
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84 sym.typ = PointerType(sym.a.typ) |
| 221 | 85 sym.lvalue = False |
| 225 | 86 else: |
| 87 raise Exception('Unknown unop {0}'.format(sym.op)) | |
| 88 elif type(sym) is Deref: | |
| 89 # pointer deref | |
| 90 sym.lvalue = True | |
| 91 # check if the to be dereferenced variable is a pointer type: | |
| 92 if type(sym.ptr.typ) is PointerType: | |
| 93 sym.typ = sym.ptr.typ.ptype | |
| 94 else: | |
| 95 self.error('Cannot dereference non-pointer type {}'.format(sym.ptr.typ), sym.loc) | |
| 96 sym.typ = intType | |
| 97 elif type(sym) is FieldRef: | |
| 98 basetype = sym.base.typ | |
| 99 sym.lvalue = True | |
| 100 if type(basetype) is StructureType: | |
| 101 if basetype.hasField(sym.field): | |
| 102 sym.typ = basetype.fieldType(sym.field) | |
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103 else: |
| 225 | 104 self.error('{} does not contain field {}'.format(basetype, symfield), sym.loc) |
| 221 | 105 sym.typ = intType |
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parents:
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106 else: |
| 225 | 107 self.error('Cannot select field {} of non-structure type {}'.format(sym.field, basetype), sym.loc) |
| 108 sym.typ = intType | |
| 109 elif type(sym) is Binop: | |
| 221 | 110 sym.lvalue = False |
| 163 | 111 if sym.op in ['+', '-', '*', '/']: |
| 112 if equalTypes(sym.a.typ, sym.b.typ): | |
| 170 | 113 if equalTypes(sym.a.typ, intType): |
| 114 sym.typ = sym.a.typ | |
| 115 else: | |
| 186 | 116 self.error('Can only add integers', sym.loc) |
| 170 | 117 sym.typ = intType |
| 163 | 118 else: |
| 165 | 119 # assume void here? TODO: throw exception! |
| 120 sym.typ = intType | |
| 225 | 121 self.error('Types unequal {} != {}'.format(sym.a.typ, sym.b.typ), sym.loc) |
| 170 | 122 elif sym.op in ['>', '<', '==', '<=', '>=']: |
| 165 | 123 sym.typ = boolType |
| 124 if not equalTypes(sym.a.typ, sym.b.typ): | |
| 225 | 125 self.error('Types unequal {} != {}'.format(sym.a.typ, sym.b.typ), sym.loc) |
| 166 | 126 elif sym.op in ['or', 'and']: |
| 127 sym.typ = boolType | |
| 128 if not equalTypes(sym.a.typ, boolType): | |
| 186 | 129 self.error('Must be {0}'.format(boolType), sym.a.loc) |
| 166 | 130 if not equalTypes(sym.b.typ, boolType): |
| 186 | 131 self.error('Must be {0}'.format(boolType), sym.b.loc) |
| 221 | 132 elif sym.op in ['|', '&']: |
| 133 sym.typ = intType | |
| 225 | 134 raise Exception('Not implemented') |
| 221 | 135 # TODO: elaborate? |
| 163 | 136 else: |
| 225 | 137 raise Exception('Unknown binop {0}'.format(sym.op)) |
| 138 elif type(sym) is Variable: | |
| 165 | 139 # check initial value type: |
| 140 # TODO | |
| 141 pass | |
| 225 | 142 elif type(sym) is TypeCast: |
| 222 | 143 if canCast(sym.a.typ, sym.to_type): |
| 144 sym.typ = sym.to_type | |
| 145 else: | |
| 146 self.error('Cannot cast {} to {}'.format(sym.a.typ, sym.to_type)) | |
| 225 | 147 elif type(sym) is Constant: |
| 148 if not equalTypes(sym.typ, sym.value.typ): | |
| 149 self.error('Cannot assign {0} to {1}'.format(sym.value.typ, sym.typ), sym.loc) | |
| 150 elif type(sym) in [EmptyStatement, CompoundStatement, Package, Function, FunctionType, ExpressionStatement, DefinedType]: | |
| 165 | 151 pass |
| 225 | 152 else: |
| 186 | 153 raise Exception('Unknown type check {0}'.format(sym)) |
| 150 | 154 |