Mercurial > lcfOS
annotate python/ppci/c3/astnodes.py @ 307:e609d5296ee9
Massive rewrite of codegenerator
| author | Windel Bouwman |
|---|---|
| date | Thu, 12 Dec 2013 20:42:56 +0100 |
| parents | b145f8e6050b |
| children | 2e7f55319858 |
| 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 |
| 288 | 10 |
| 148 | 11 class Node: |
| 306 | 12 """ Base class of all nodes in a AST """ |
| 288 | 13 pass |
| 14 | |
| 148 | 15 |
| 300 | 16 # Variables, parameters, local variables, constants and named types: |
| 17 class Symbol(Node): | |
| 306 | 18 """ Symbol is the base class for all named things like variables, |
| 19 functions, constants and types and modules """ | |
| 300 | 20 def __init__(self, name): |
| 21 self.name = name | |
| 22 self.refs = [] | |
| 23 | |
| 24 def addRef(self, r): | |
| 25 self.refs.append(r) | |
| 26 | |
| 27 @property | |
| 28 def References(self): | |
| 29 return self.refs | |
| 30 | |
| 31 | |
| 213 | 32 # Modules |
| 301 | 33 class Package(Symbol): |
| 213 | 34 def __init__(self, name, loc): |
| 301 | 35 super().__init__(name) |
| 213 | 36 self.loc = loc |
| 37 self.declarations = [] | |
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38 self.imports = [] |
| 288 | 39 |
| 213 | 40 def __repr__(self): |
| 284 | 41 return 'MODULE {}'.format(self.name) |
| 42 | |
| 213 | 43 |
| 149 | 44 class Type(Node): |
| 306 | 45 """ Base class of all types """ |
| 288 | 46 pass |
| 272 | 47 |
| 148 | 48 |
| 300 | 49 class NamedType(Type, Symbol): |
| 306 | 50 """ Some types are named, for example a user defined type (typedef) |
| 51 and built in types. That is why this class derives from both Type | |
| 52 and Symbol. """ | |
| 272 | 53 def __init__(self, name): |
| 300 | 54 Symbol.__init__(self, name) |
| 55 | |
| 56 | |
| 57 class BaseType(NamedType): | |
| 306 | 58 """ Built in type """ |
| 300 | 59 def __init__(self, name): |
| 60 super().__init__(name) | |
| 272 | 61 |
| 62 def __repr__(self): | |
| 63 return '{}'.format(self.name) | |
| 64 | |
| 148 | 65 |
| 66 class FunctionType(Type): | |
| 306 | 67 """ Function blueprint, defines argument types and return type """ |
| 288 | 68 def __init__(self, parametertypes, returntype): |
| 69 self.parametertypes = parametertypes | |
| 70 self.returntype = returntype | |
| 71 | |
| 72 def __repr__(self): | |
| 73 params = ', '.join([str(v) for v in self.parametertypes]) | |
| 74 return '{1} f({0})'.format(params, self.returntype) | |
| 148 | 75 |
| 272 | 76 |
| 213 | 77 class PointerType(Type): |
| 288 | 78 """ A type that points to data of some other type """ |
| 213 | 79 def __init__(self, ptype): |
| 306 | 80 assert isinstance(ptype, Type) or isinstance(ptype, Expression) |
| 213 | 81 self.ptype = ptype |
| 288 | 82 |
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83 def __repr__(self): |
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84 return '({}*)'.format(self.ptype) |
| 213 | 85 |
| 230 | 86 |
| 227 | 87 class StructField: |
| 88 def __init__(self, name, typ): | |
| 306 | 89 assert type(name) is str |
| 227 | 90 self.name = name |
| 91 self.typ = typ | |
| 230 | 92 self.offset = 0 |
| 93 | |
| 227 | 94 |
| 213 | 95 class StructureType(Type): |
| 306 | 96 """ Struct type consisting of several named members """ |
| 213 | 97 def __init__(self, mems): |
| 98 self.mems = mems | |
| 306 | 99 assert all(type(mem) is StructField for mem in mems) |
| 230 | 100 |
| 225 | 101 def hasField(self, name): |
| 227 | 102 for mem in self.mems: |
| 103 if name == mem.name: | |
| 225 | 104 return True |
| 105 return False | |
| 230 | 106 |
| 225 | 107 def fieldType(self, name): |
| 230 | 108 return self.findField(name).typ |
| 109 | |
| 110 def fieldOffset(self, name): | |
| 111 return self.findField(name).offset | |
| 112 | |
| 113 def findField(self, name): | |
| 227 | 114 for mem in self.mems: |
| 115 if name == mem.name: | |
| 230 | 116 return mem |
| 117 raise KeyError(name) | |
| 225 | 118 |
| 230 | 119 def __repr__(self): |
| 120 return 'STRUCT' | |
| 213 | 121 |
| 272 | 122 |
| 300 | 123 class DefinedType(NamedType): |
| 288 | 124 """ A named type indicating another type """ |
| 225 | 125 def __init__(self, name, typ, loc): |
| 126 assert isinstance(name, str) | |
| 300 | 127 super().__init__(name) |
| 225 | 128 self.typ = typ |
| 129 self.loc = loc | |
| 230 | 130 |
| 225 | 131 def __repr__(self): |
| 132 return 'Named type {0} of type {1}'.format(self.name, self.typ) | |
| 148 | 133 |
| 221 | 134 |
| 148 | 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.isLocal = False | |
| 150 self.isReadOnly = False | |
| 151 self.isParameter = False | |
| 152 | |
| 153 def __repr__(self): | |
| 154 return 'Var {} [{}]'.format(self.name, self.typ) | |
| 155 | |
| 156 | |
| 157 class LocalVariable(Variable): | |
| 158 def __init__(self, name, typ): | |
| 159 super().__init__(name, typ) | |
| 160 self.isLocal = True | |
| 161 | |
| 162 | |
| 163 class FormalParameter(Variable): | |
| 164 def __init__(self, name, typ): | |
| 165 super().__init__(name, typ) | |
| 166 self.isParameter = True | |
| 167 | |
| 148 | 168 |
| 150 | 169 # Procedure types |
| 170 class Function(Symbol): | |
| 213 | 171 """ Actual implementation of a function """ |
| 172 def __init__(self, name, loc): | |
| 173 super().__init__(name) | |
| 174 self.loc = loc | |
| 215 | 175 self.declarations = [] |
| 213 | 176 |
| 177 def __repr__(self): | |
| 217 | 178 return 'Func {}'.format(self.name) |
| 148 | 179 |
| 288 | 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 | |
| 288 | 192 |
| 225 | 193 def __repr__(self): |
| 288 | 194 return 'DEREF {}'.format(self.ptr) |
| 225 | 195 |
| 230 | 196 |
| 197 class TypeCast(Expression): | |
| 198 def __init__(self, to_type, x, loc): | |
| 199 super().__init__(loc) | |
| 200 self.to_type = to_type | |
| 201 self.a = x | |
| 288 | 202 |
| 230 | 203 def __repr__(self): |
| 204 return 'TYPECAST {}'.format(self.to_type) | |
| 205 | |
| 206 | |
| 306 | 207 class Member(Expression): |
| 208 """ Field reference of some object, can also be package selection """ | |
| 225 | 209 def __init__(self, base, field, loc): |
| 230 | 210 super().__init__(loc) |
| 225 | 211 assert isinstance(base, Expression) |
| 212 assert isinstance(field, str) | |
| 213 self.base = base | |
| 214 self.field = field | |
| 288 | 215 |
| 225 | 216 def __repr__(self): |
| 306 | 217 return 'MEMBER {}.{}'.format(self.base, self.field) |
| 225 | 218 |
| 230 | 219 |
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220 class Unop(Expression): |
| 306 | 221 """ Operation on one operand """ |
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222 def __init__(self, op, a, loc): |
| 230 | 223 super().__init__(loc) |
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224 assert isinstance(a, Expression) |
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225 assert isinstance(op, str) |
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226 self.a = a |
| 230 | 227 self.op = op |
| 288 | 228 |
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229 def __repr__(self): |
| 288 | 230 return 'UNOP {}'.format(self.op) |
| 231 | |
| 148 | 232 |
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233 class Binop(Expression): |
| 306 | 234 """ Expression taking two operands and one operator """ |
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235 def __init__(self, a, op, b, loc): |
| 230 | 236 super().__init__(loc) |
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237 assert isinstance(a, Expression), type(a) |
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238 assert isinstance(b, Expression) |
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239 assert isinstance(op, str) |
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240 self.a = a |
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241 self.b = b |
| 288 | 242 self.op = op # Operation: '+', '-', '*', '/', 'mod' |
| 148 | 243 |
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244 def __repr__(self): |
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245 return 'BINOP {}'.format(self.op) |
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246 |
| 288 | 247 |
| 306 | 248 class Identifier(Expression): |
| 249 """ Reference to some identifier, can be anything from package, variable | |
| 250 function or type, any named thing! """ | |
| 228 | 251 def __init__(self, target, loc): |
| 230 | 252 super().__init__(loc) |
| 228 | 253 self.target = target |
| 288 | 254 |
| 228 | 255 def __repr__(self): |
| 306 | 256 return 'ID {}'.format(self.target) |
| 163 | 257 |
| 284 | 258 |
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259 class Literal(Expression): |
| 306 | 260 """ Constant value or string """ |
| 228 | 261 def __init__(self, val, loc): |
| 230 | 262 super().__init__(loc) |
| 228 | 263 self.val = val |
| 288 | 264 |
| 228 | 265 def __repr__(self): |
| 266 return 'LITERAL {}'.format(self.val) | |
| 150 | 267 |
| 284 | 268 |
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269 class FunctionCall(Expression): |
| 306 | 270 """ Call to a some function """ |
| 228 | 271 def __init__(self, proc, args, loc): |
| 230 | 272 super().__init__(loc) |
| 228 | 273 self.proc = proc |
| 274 self.args = args | |
| 288 | 275 |
| 228 | 276 def __repr__(self): |
| 277 return 'CALL {0} '.format(self.proc) | |
| 148 | 278 |
| 284 | 279 |
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280 # Statements |
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281 class Statement(Node): |
| 306 | 282 """ Base class of all statements """ |
| 228 | 283 def __init__(self, loc): |
| 284 self.loc = loc | |
| 285 | |
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286 |
| 307 | 287 class Empty(Statement): |
| 306 | 288 """ Empty statement which does nothing! """ |
| 289 def __init__(self): | |
| 290 super().__init__(None) | |
| 291 | |
| 292 def __repr__(self): | |
| 293 return 'NOP' | |
| 294 | |
| 295 | |
| 307 | 296 class Compound(Statement): |
| 306 | 297 """ Statement consisting of a sequence of other statements """ |
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298 def __init__(self, statements): |
| 249 | 299 super().__init__(None) |
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300 self.statements = statements |
| 228 | 301 for s in self.statements: |
| 302 assert isinstance(s, Statement) | |
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303 |
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304 def __repr__(self): |
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305 return 'COMPOUND STATEMENT' |
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306 |
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307 |
| 307 | 308 class Return(Statement): |
| 228 | 309 def __init__(self, expr, loc): |
| 310 super().__init__(loc) | |
| 311 self.expr = expr | |
| 312 | |
| 313 def __repr__(self): | |
| 314 return 'RETURN STATEMENT' | |
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315 |
| 284 | 316 |
| 222 | 317 class Assignment(Statement): |
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318 def __init__(self, lval, rval, loc): |
| 228 | 319 super().__init__(loc) |
| 306 | 320 assert isinstance(lval, Expression) |
| 321 assert isinstance(rval, Expression) | |
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322 self.lval = lval |
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323 self.rval = rval |
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324 |
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325 def __repr__(self): |
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326 return 'ASSIGNMENT' |
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327 |
| 288 | 328 |
| 222 | 329 class ExpressionStatement(Statement): |
| 330 def __init__(self, ex, loc): | |
| 228 | 331 super().__init__(loc) |
| 222 | 332 self.ex = ex |
| 228 | 333 |
| 222 | 334 def __repr__(self): |
| 335 return 'Epression' | |
| 336 | |
| 228 | 337 |
| 307 | 338 class If(Statement): |
| 228 | 339 def __init__(self, condition, truestatement, falsestatement, loc): |
| 340 super().__init__(loc) | |
| 341 self.condition = condition | |
| 342 self.truestatement = truestatement | |
| 343 self.falsestatement = falsestatement | |
| 344 | |
| 345 def __repr__(self): | |
| 346 return 'IF-statement' | |
| 347 | |
| 148 | 348 |
| 307 | 349 class While(Statement): |
| 228 | 350 def __init__(self, condition, statement, loc): |
| 351 super().__init__(loc) | |
| 352 self.condition = condition | |
| 353 self.statement = statement | |
| 148 | 354 |
| 228 | 355 def __repr__(self): |
| 356 return 'WHILE-statement' |