Mercurial > lcfOS
annotate python/c3/typecheck.py @ 230:88a1e0baef65
Added some tests for IR-code
| author | Windel Bouwman |
|---|---|
| date | Sat, 13 Jul 2013 19:53:44 +0200 |
| parents | 7f18ed9b6b7e |
| children | 521567d17388 |
| rev | line source |
|---|---|
| 163 | 1 from .astnodes import * |
| 2 from .scope import * | |
| 3 from .visitor import Visitor | |
| 4 | |
| 230 | 5 def resolveType(t): |
| 6 if type(t) is DefinedType: | |
| 7 return resolveType(t.typ) | |
| 8 return t | |
| 9 | |
| 163 | 10 def equalTypes(a, b): |
| 230 | 11 """ |
| 228 | 12 Compare types a and b for equality. |
| 13 Not equal until proven otherwise. | |
| 14 """ | |
| 226 | 15 # Recurse into named types: |
| 230 | 16 a = resolveType(a) |
| 17 b = resolveType(b) | |
| 18 | |
| 226 | 19 # Compare for structural equivalence: |
| 20 if type(a) is type(b): | |
| 21 if type(a) is BaseType: | |
| 22 return a.name == b.name | |
| 23 elif type(a) is PointerType: | |
| 24 return equalTypes(a.ptype, b.ptype) | |
| 227 | 25 elif type(a) is StructureType: |
| 26 if len(a.mems) != len(b.mems): | |
| 27 return False | |
| 28 for amem, bmem in zip(a.mems, b.mems): | |
| 29 if not equalTypes(amem.typ, bmem.typ): | |
| 30 return False | |
| 31 return True | |
| 32 else: | |
| 33 raise Exception('Type compare not implemented') | |
| 226 | 34 return False |
| 150 | 35 |
| 222 | 36 def canCast(fromT, toT): |
| 230 | 37 fromT = resolveType(fromT) |
| 38 toT = resolveType(toT) | |
| 222 | 39 if isinstance(fromT, PointerType) and isinstance(toT, PointerType): |
| 40 return True | |
| 41 elif fromT is intType and isinstance(toT, PointerType): | |
| 42 return True | |
| 43 return False | |
| 44 | |
| 230 | 45 def expectRval(s): |
| 46 # TODO: solve this better | |
| 47 s.expect_rvalue = True | |
| 48 | |
| 150 | 49 class TypeChecker: |
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50 def __init__(self, diag): |
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51 self.diag = diag |
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52 |
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53 def error(self, msg, loc): |
| 230 | 54 """ |
| 55 Wrapper that registers the message and marks the result invalid | |
| 228 | 56 """ |
| 186 | 57 self.diag.error(msg, loc) |
| 58 self.ok = False | |
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59 |
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60 def checkPackage(self, pkg): |
| 186 | 61 self.ok = True |
| 215 | 62 visitor = Visitor() |
| 63 visitor.visit(pkg, f_post=self.check2) | |
| 186 | 64 return self.ok |
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65 |
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66 def check2(self, sym): |
| 225 | 67 if type(sym) in [IfStatement, WhileStatement]: |
| 68 if not equalTypes(sym.condition.typ, boolType): | |
| 230 | 69 msg = 'Condition must be of type {}'.format(boolType) |
| 70 self.error(msg, sym.condition.loc) | |
| 225 | 71 elif type(sym) is Assignment: |
| 230 | 72 l, r = sym.lval, sym.rval |
| 73 if not equalTypes(l.typ, r.typ): | |
| 74 msg = 'Cannot assign {} to {}'.format(r.typ, l.typ) | |
| 75 self.error(msg, sym.loc) | |
| 76 if not l.lvalue: | |
| 77 self.error('No valid lvalue {}'.format(l), l.loc) | |
| 221 | 78 #if sym.rval.lvalue: |
| 79 # self.error('Right hand side must be an rvalue', sym.rval.loc) | |
| 230 | 80 expectRval(sym.rval) |
| 225 | 81 elif type(sym) is ReturnStatement: |
| 82 pass | |
| 83 elif type(sym) is FunctionCall: | |
| 167 | 84 # Check arguments: |
| 85 ngiv = len(sym.args) | |
| 86 ptypes = sym.proc.typ.parametertypes | |
| 87 nreq = len(ptypes) | |
| 88 if ngiv != nreq: | |
| 186 | 89 self.error('Function {2}: {0} arguments required, {1} given'.format(nreq, ngiv, sym.proc.name), sym.loc) |
| 167 | 90 else: |
| 91 for a, at in zip(sym.args, ptypes): | |
| 230 | 92 expectRval(a) |
| 167 | 93 if not equalTypes(a.typ, at): |
| 186 | 94 self.error('Got {0}, expected {1}'.format(a.typ, at), a.loc) |
| 167 | 95 # determine return type: |
| 96 sym.typ = sym.proc.typ.returntype | |
| 225 | 97 elif type(sym) is VariableUse: |
| 221 | 98 sym.lvalue = True |
| 225 | 99 if type(sym.target) is Variable: |
| 221 | 100 sym.typ = sym.target.typ |
| 101 else: | |
| 225 | 102 print('warning {} has no target, defaulting to int'.format(sym)) |
| 221 | 103 sym.typ = intType |
| 225 | 104 elif type(sym) is Literal: |
| 221 | 105 sym.lvalue = False |
| 106 if type(sym.val) is int: | |
| 107 sym.typ = intType | |
| 108 elif type(sym.val) is float: | |
| 109 sym.typ = doubleType | |
| 110 elif type(sym.val) is bool: | |
| 111 sym.typ = boolType | |
| 112 else: | |
| 225 | 113 raise Exception('Unknown literal type'.format(sym.val)) |
| 114 elif type(sym) is Unop: | |
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115 if sym.op == '&': |
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116 sym.typ = PointerType(sym.a.typ) |
| 221 | 117 sym.lvalue = False |
| 225 | 118 else: |
| 119 raise Exception('Unknown unop {0}'.format(sym.op)) | |
| 120 elif type(sym) is Deref: | |
| 121 # pointer deref | |
| 122 sym.lvalue = True | |
| 123 # check if the to be dereferenced variable is a pointer type: | |
| 230 | 124 ptype = resolveType(sym.ptr.typ) |
| 226 | 125 if type(ptype) is PointerType: |
| 126 sym.typ = ptype.ptype | |
| 225 | 127 else: |
| 226 | 128 self.error('Cannot dereference non-pointer type {}'.format(ptype), sym.loc) |
| 225 | 129 sym.typ = intType |
| 130 elif type(sym) is FieldRef: | |
| 131 basetype = sym.base.typ | |
| 230 | 132 sym.lvalue = sym.base.lvalue |
| 133 basetype = resolveType(basetype) | |
| 225 | 134 if type(basetype) is StructureType: |
| 135 if basetype.hasField(sym.field): | |
| 136 sym.typ = basetype.fieldType(sym.field) | |
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137 else: |
| 226 | 138 self.error('{} does not contain field {}'.format(basetype, sym.field), sym.loc) |
| 221 | 139 sym.typ = intType |
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Windel Bouwman
parents:
215
diff
changeset
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140 else: |
| 225 | 141 self.error('Cannot select field {} of non-structure type {}'.format(sym.field, basetype), sym.loc) |
| 142 sym.typ = intType | |
| 143 elif type(sym) is Binop: | |
| 227 | 144 sym.lvalue = False |
| 145 if sym.op in ['+', '-', '*', '/']: | |
| 230 | 146 expectRval(sym.a) |
| 147 expectRval(sym.b) | |
| 227 | 148 if equalTypes(sym.a.typ, sym.b.typ): |
| 149 if equalTypes(sym.a.typ, intType): | |
| 150 sym.typ = sym.a.typ | |
| 151 else: | |
| 152 self.error('Can only add integers', sym.loc) | |
| 153 sym.typ = intType | |
| 154 else: | |
| 155 # assume void here? TODO: throw exception! | |
| 156 sym.typ = intType | |
| 157 self.error('Types unequal {} != {}'.format(sym.a.typ, sym.b.typ), sym.loc) | |
| 158 elif sym.op in ['>', '<', '==', '<=', '>=']: | |
| 159 sym.typ = boolType | |
| 160 if not equalTypes(sym.a.typ, sym.b.typ): | |
| 161 self.error('Types unequal {} != {}'.format(sym.a.typ, sym.b.typ), sym.loc) | |
| 162 elif sym.op in ['or', 'and']: | |
| 163 sym.typ = boolType | |
| 164 if not equalTypes(sym.a.typ, boolType): | |
| 165 self.error('Must be {0}'.format(boolType), sym.a.loc) | |
| 166 if not equalTypes(sym.b.typ, boolType): | |
| 167 self.error('Must be {0}'.format(boolType), sym.b.loc) | |
| 168 elif sym.op in ['|', '&']: | |
| 169 sym.typ = intType | |
| 170 sym.lvalue = False | |
| 171 if equalTypes(sym.a.typ, sym.b.typ): | |
| 172 if not equalTypes(sym.a.typ, intType): | |
| 173 self.error('Can only add integers', sym.loc) | |
| 174 else: | |
| 175 self.error('Types unequal {} != {}'.format(sym.a.typ, sym.b.typ), sym.loc) | |
| 163 | 176 else: |
| 227 | 177 raise Exception('Unknown binop {0}'.format(sym.op)) |
| 225 | 178 elif type(sym) is Variable: |
| 165 | 179 # check initial value type: |
| 180 # TODO | |
| 181 pass | |
| 225 | 182 elif type(sym) is TypeCast: |
| 222 | 183 if canCast(sym.a.typ, sym.to_type): |
| 184 sym.typ = sym.to_type | |
| 185 else: | |
| 230 | 186 self.error('Cannot cast {} to {}'.format(sym.a.typ, sym.to_type), sym.loc) |
| 187 sym.typ = intType | |
| 225 | 188 elif type(sym) is Constant: |
| 189 if not equalTypes(sym.typ, sym.value.typ): | |
| 190 self.error('Cannot assign {0} to {1}'.format(sym.value.typ, sym.typ), sym.loc) | |
| 228 | 191 elif type(sym) in [CompoundStatement, Package, Function, FunctionType, ExpressionStatement, DefinedType]: |
| 230 | 192 pass |
| 225 | 193 else: |
| 186 | 194 raise Exception('Unknown type check {0}'.format(sym)) |
| 150 | 195 |