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annotate python/c3/astnodes.py @ 282:c137f1fe3e65
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| author | Windel Bouwman |
|---|---|
| date | Fri, 15 Nov 2013 09:32:37 +0100 |
| parents | e64bae57cda8 |
| children | 05184b95fa16 |
| rev | line source |
|---|---|
| 148 | 1 """ |
| 213 | 2 AST (abstract syntax tree) nodes for the c3 language. |
| 3 The tree is build by the parser. | |
| 4 Then it is checked | |
| 5 Finally code is generated from it. | |
| 148 | 6 """ |
| 7 | |
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8 from ppci import SourceLocation |
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9 |
| 148 | 10 class Node: |
| 163 | 11 pass |
| 148 | 12 |
| 213 | 13 # Modules |
| 14 class Package(Node): | |
| 15 def __init__(self, name, loc): | |
| 16 self.name = name | |
| 17 self.loc = loc | |
| 18 self.declarations = [] | |
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19 self.imports = [] |
| 213 | 20 def __repr__(self): |
| 21 return 'PACKAGE {}'.format(self.name) | |
| 22 | |
| 150 | 23 class Designator(Node): |
| 213 | 24 def __init__(self, tname, loc): |
| 25 self.tname = tname | |
| 26 self.loc = loc | |
| 27 def __repr__(self): | |
| 28 return 'DESIGNATOR {}'.format(self.tname) | |
| 148 | 29 |
| 30 """ | |
| 31 Type classes | |
| 213 | 32 |
| 33 types must be comparable. | |
| 34 | |
| 35 There are the following types: | |
| 228 | 36 - base type -> basic type (built in) |
| 37 - struct type -> a composite type that contains a list of named fields | |
| 38 of other types | |
| 39 - pointer type -> a type that points to some other type | |
| 40 - typedef type -> a named type indicating another type | |
| 213 | 41 - function type |
| 148 | 42 """ |
| 43 | |
| 149 | 44 class Type(Node): |
| 272 | 45 def isType(self, b): |
| 46 return isType(self, b) | |
| 47 | |
| 148 | 48 |
| 49 class BaseType(Type): | |
| 272 | 50 def __init__(self, name): |
| 51 self.name = name | |
| 52 | |
| 53 def __repr__(self): | |
| 54 return '{}'.format(self.name) | |
| 55 | |
| 148 | 56 |
| 57 class FunctionType(Type): | |
| 167 | 58 def __init__(self, parametertypes, returntype): |
| 59 self.parametertypes = parametertypes | |
| 148 | 60 self.returntype = returntype |
| 61 def __repr__(self): | |
| 167 | 62 params = ', '.join([str(v) for v in self.parametertypes]) |
| 165 | 63 return '{1} f({0})'.format(params, self.returntype) |
| 148 | 64 |
| 272 | 65 |
| 213 | 66 class PointerType(Type): |
| 67 def __init__(self, ptype): | |
| 225 | 68 assert isinstance(ptype, Type) or isinstance(ptype, Designator) |
| 213 | 69 self.ptype = ptype |
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70 def __repr__(self): |
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71 return '({}*)'.format(self.ptype) |
| 213 | 72 |
| 230 | 73 |
| 227 | 74 class StructField: |
| 75 def __init__(self, name, typ): | |
| 76 self.name = name | |
| 77 self.typ = typ | |
| 230 | 78 self.offset = 0 |
| 79 | |
| 227 | 80 |
| 213 | 81 class StructureType(Type): |
| 82 def __init__(self, mems): | |
| 83 self.mems = mems | |
| 227 | 84 for mem in mems: |
| 85 assert type(mem) is StructField | |
| 86 assert type(mem.name) is str | |
| 230 | 87 |
| 225 | 88 def hasField(self, name): |
| 227 | 89 for mem in self.mems: |
| 90 if name == mem.name: | |
| 225 | 91 return True |
| 92 return False | |
| 230 | 93 |
| 225 | 94 def fieldType(self, name): |
| 230 | 95 return self.findField(name).typ |
| 96 | |
| 97 def fieldOffset(self, name): | |
| 98 return self.findField(name).offset | |
| 99 | |
| 100 def findField(self, name): | |
| 227 | 101 for mem in self.mems: |
| 102 if name == mem.name: | |
| 230 | 103 return mem |
| 104 raise KeyError(name) | |
| 225 | 105 |
| 230 | 106 def __repr__(self): |
| 107 return 'STRUCT' | |
| 213 | 108 |
| 272 | 109 |
| 148 | 110 class DefinedType(Type): |
| 225 | 111 def __init__(self, name, typ, loc): |
| 112 assert isinstance(name, str) | |
| 113 self.name = name | |
| 114 self.typ = typ | |
| 115 self.loc = loc | |
| 230 | 116 |
| 225 | 117 def __repr__(self): |
| 118 return 'Named type {0} of type {1}'.format(self.name, self.typ) | |
| 148 | 119 |
| 221 | 120 |
| 148 | 121 # Variables, parameters, local variables, constants: |
| 122 class Symbol(Node): | |
| 213 | 123 def __init__(self, name): |
| 272 | 124 self.name = name |
| 125 self.refs = [] | |
| 126 | |
| 213 | 127 def addRef(self, r): |
| 272 | 128 self.refs.append(r) |
| 129 | |
| 213 | 130 @property |
| 131 def References(self): | |
| 272 | 132 return self.refs |
| 133 | |
| 148 | 134 |
| 135 class Constant(Symbol): | |
| 213 | 136 def __init__(self, name, typ, value): |
| 272 | 137 super().__init__(name) |
| 138 self.typ = typ | |
| 139 self.value = value | |
| 140 | |
| 213 | 141 def __repr__(self): |
| 272 | 142 return 'CONSTANT {0} = {1}'.format(self.name, self.value) |
| 143 | |
| 148 | 144 |
| 145 class Variable(Symbol): | |
| 272 | 146 def __init__(self, name, typ): |
| 147 super().__init__(name) | |
| 148 self.typ = typ | |
| 149 self.ival = None | |
| 150 self.isLocal = False | |
| 151 self.isReadOnly = False | |
| 152 self.isParameter = False | |
| 153 | |
| 154 def __repr__(self): | |
| 155 return 'Var {} [{}]'.format(self.name, self.typ) | |
| 156 | |
| 157 | |
| 158 class LocalVariable(Variable): | |
| 159 def __init__(self, name, typ): | |
| 160 super().__init__(name, typ) | |
| 161 self.isLocal = True | |
| 162 | |
| 163 | |
| 164 class FormalParameter(Variable): | |
| 165 def __init__(self, name, typ): | |
| 166 super().__init__(name, typ) | |
| 167 self.isParameter = True | |
| 168 | |
| 148 | 169 |
| 150 | 170 # Procedure types |
| 171 class Function(Symbol): | |
| 213 | 172 """ Actual implementation of a function """ |
| 173 def __init__(self, name, loc): | |
| 174 super().__init__(name) | |
| 175 self.loc = loc | |
| 215 | 176 self.declarations = [] |
| 213 | 177 |
| 178 def __repr__(self): | |
| 217 | 179 return 'Func {}'.format(self.name) |
| 148 | 180 |
| 163 | 181 # Operations / Expressions: |
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182 class Expression(Node): |
| 230 | 183 def __init__(self, loc): |
| 184 self.loc = loc | |
| 185 | |
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186 |
| 225 | 187 class Deref(Expression): |
| 188 def __init__(self, ptr, loc): | |
| 230 | 189 super().__init__(loc) |
| 225 | 190 assert isinstance(ptr, Expression) |
| 191 self.ptr = ptr | |
| 192 def __repr__(self): | |
| 193 return 'DEREF {}'.format(self.ptr) | |
| 194 | |
| 230 | 195 |
| 196 class TypeCast(Expression): | |
| 197 def __init__(self, to_type, x, loc): | |
| 198 super().__init__(loc) | |
| 199 self.to_type = to_type | |
| 200 self.a = x | |
| 201 def __repr__(self): | |
| 202 return 'TYPECAST {}'.format(self.to_type) | |
| 203 | |
| 204 | |
| 225 | 205 class FieldRef(Expression): |
| 206 def __init__(self, base, field, loc): | |
| 230 | 207 super().__init__(loc) |
| 225 | 208 assert isinstance(base, Expression) |
| 209 assert isinstance(field, str) | |
| 210 self.base = base | |
| 211 self.field = field | |
| 212 def __repr__(self): | |
| 213 return 'FIELD {}.{}'.format(self.base, self.field) | |
| 214 | |
| 230 | 215 |
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216 class Unop(Expression): |
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217 def __init__(self, op, a, loc): |
| 230 | 218 super().__init__(loc) |
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219 assert isinstance(a, Expression) |
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220 assert isinstance(op, str) |
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221 self.a = a |
| 230 | 222 self.op = op |
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223 def __repr__(self): |
| 212 | 224 return 'UNOP {}'.format(self.op) |
| 148 | 225 |
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226 class Binop(Expression): |
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227 def __init__(self, a, op, b, loc): |
| 230 | 228 super().__init__(loc) |
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229 assert isinstance(a, Expression), type(a) |
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230 assert isinstance(b, Expression) |
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231 assert isinstance(op, str) |
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232 self.a = a |
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233 self.b = b |
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234 self.op = op # Operation: '+', '-', '*', '/', 'mod' |
| 148 | 235 |
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236 def __repr__(self): |
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237 return 'BINOP {}'.format(self.op) |
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238 |
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239 class VariableUse(Expression): |
| 228 | 240 def __init__(self, target, loc): |
| 230 | 241 super().__init__(loc) |
| 228 | 242 self.target = target |
| 243 def __repr__(self): | |
| 244 nm = self.target | |
| 245 return 'VAR USE {}'.format(nm) | |
| 163 | 246 |
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247 class Literal(Expression): |
| 228 | 248 def __init__(self, val, loc): |
| 230 | 249 super().__init__(loc) |
| 228 | 250 self.val = val |
| 251 def __repr__(self): | |
| 252 return 'LITERAL {}'.format(self.val) | |
| 150 | 253 |
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254 class FunctionCall(Expression): |
| 228 | 255 def __init__(self, proc, args, loc): |
| 230 | 256 super().__init__(loc) |
| 228 | 257 self.proc = proc |
| 258 self.args = args | |
| 259 def __repr__(self): | |
| 260 return 'CALL {0} '.format(self.proc) | |
| 148 | 261 |
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262 # Statements |
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263 class Statement(Node): |
| 228 | 264 def __init__(self, loc): |
| 265 self.loc = loc | |
| 266 | |
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267 |
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268 class CompoundStatement(Statement): |
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269 def __init__(self, statements): |
| 249 | 270 super().__init__(None) |
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271 self.statements = statements |
| 228 | 272 for s in self.statements: |
| 273 assert isinstance(s, Statement) | |
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274 |
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275 def __repr__(self): |
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276 return 'COMPOUND STATEMENT' |
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277 |
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278 |
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279 class ReturnStatement(Statement): |
| 228 | 280 def __init__(self, expr, loc): |
| 281 super().__init__(loc) | |
| 282 self.expr = expr | |
| 283 | |
| 284 def __repr__(self): | |
| 285 return 'RETURN STATEMENT' | |
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286 |
| 222 | 287 class Assignment(Statement): |
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288 def __init__(self, lval, rval, loc): |
| 228 | 289 super().__init__(loc) |
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290 assert isinstance(lval, Node) |
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291 assert isinstance(rval, Node) |
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292 self.lval = lval |
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293 self.rval = rval |
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294 |
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295 def __repr__(self): |
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296 return 'ASSIGNMENT' |
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297 |
| 222 | 298 class ExpressionStatement(Statement): |
| 299 def __init__(self, ex, loc): | |
| 228 | 300 super().__init__(loc) |
| 222 | 301 self.ex = ex |
| 228 | 302 |
| 222 | 303 def __repr__(self): |
| 304 return 'Epression' | |
| 305 | |
| 228 | 306 |
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307 class IfStatement(Statement): |
| 228 | 308 def __init__(self, condition, truestatement, falsestatement, loc): |
| 309 super().__init__(loc) | |
| 310 self.condition = condition | |
| 311 self.truestatement = truestatement | |
| 312 self.falsestatement = falsestatement | |
| 313 | |
| 314 def __repr__(self): | |
| 315 return 'IF-statement' | |
| 316 | |
| 148 | 317 |
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318 class WhileStatement(Statement): |
| 228 | 319 def __init__(self, condition, statement, loc): |
| 320 super().__init__(loc) | |
| 321 self.condition = condition | |
| 322 self.statement = statement | |
| 148 | 323 |
| 228 | 324 def __repr__(self): |
| 325 return 'WHILE-statement' | |
| 326 |