Mercurial > lcfOS
annotate python/c3/astnodes.py @ 251:6ed3d3a82a63
Added another c3 example. First import attempt
| author | Windel Bouwman |
|---|---|
| date | Mon, 29 Jul 2013 20:23:13 +0200 |
| parents | e41e4109addd |
| children | e64bae57cda8 |
| 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): |
| 148 | 45 def isType(self, b): |
| 46 return isType(self, b) | |
| 47 | |
| 48 class BaseType(Type): | |
| 49 def __init__(self, name): | |
| 50 self.name = name | |
| 51 def __repr__(self): | |
| 212 | 52 return '{}'.format(self.name) |
| 148 | 53 |
| 54 class FunctionType(Type): | |
| 167 | 55 def __init__(self, parametertypes, returntype): |
| 56 self.parametertypes = parametertypes | |
| 148 | 57 self.returntype = returntype |
| 58 def __repr__(self): | |
| 167 | 59 params = ', '.join([str(v) for v in self.parametertypes]) |
| 165 | 60 return '{1} f({0})'.format(params, self.returntype) |
| 148 | 61 |
| 213 | 62 class PointerType(Type): |
| 63 def __init__(self, ptype): | |
| 225 | 64 assert isinstance(ptype, Type) or isinstance(ptype, Designator) |
| 213 | 65 self.ptype = ptype |
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66 def __repr__(self): |
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67 return '({}*)'.format(self.ptype) |
| 213 | 68 |
| 230 | 69 |
| 227 | 70 class StructField: |
| 71 def __init__(self, name, typ): | |
| 72 self.name = name | |
| 73 self.typ = typ | |
| 230 | 74 self.offset = 0 |
| 75 | |
| 227 | 76 |
| 213 | 77 class StructureType(Type): |
| 78 def __init__(self, mems): | |
| 79 self.mems = mems | |
| 227 | 80 for mem in mems: |
| 81 assert type(mem) is StructField | |
| 82 assert type(mem.name) is str | |
| 230 | 83 |
| 225 | 84 def hasField(self, name): |
| 227 | 85 for mem in self.mems: |
| 86 if name == mem.name: | |
| 225 | 87 return True |
| 88 return False | |
| 230 | 89 |
| 225 | 90 def fieldType(self, name): |
| 230 | 91 return self.findField(name).typ |
| 92 | |
| 93 def fieldOffset(self, name): | |
| 94 return self.findField(name).offset | |
| 95 | |
| 96 def findField(self, name): | |
| 227 | 97 for mem in self.mems: |
| 98 if name == mem.name: | |
| 230 | 99 return mem |
| 100 raise KeyError(name) | |
| 225 | 101 |
| 230 | 102 def __repr__(self): |
| 103 return 'STRUCT' | |
| 213 | 104 |
| 148 | 105 class DefinedType(Type): |
| 225 | 106 def __init__(self, name, typ, loc): |
| 107 assert isinstance(name, str) | |
| 108 self.name = name | |
| 109 self.typ = typ | |
| 110 self.loc = loc | |
| 230 | 111 |
| 225 | 112 def __repr__(self): |
| 113 return 'Named type {0} of type {1}'.format(self.name, self.typ) | |
| 148 | 114 |
| 221 | 115 |
| 148 | 116 # Variables, parameters, local variables, constants: |
| 117 class Symbol(Node): | |
| 213 | 118 def __init__(self, name): |
| 163 | 119 self.name = name |
| 120 self.refs = [] | |
| 213 | 121 def addRef(self, r): |
| 163 | 122 self.refs.append(r) |
| 213 | 123 @property |
| 124 def References(self): | |
| 163 | 125 return self.refs |
| 148 | 126 |
| 127 class Constant(Symbol): | |
| 213 | 128 def __init__(self, name, typ, value): |
| 163 | 129 super().__init__(name) |
| 130 self.typ = typ | |
| 148 | 131 self.value = value |
| 213 | 132 def __repr__(self): |
| 148 | 133 return 'CONSTANT {0} = {1}'.format(self.name, self.value) |
| 134 | |
| 135 class Variable(Symbol): | |
| 213 | 136 def __init__(self, name, typ): |
| 163 | 137 super().__init__(name) |
| 148 | 138 self.typ = typ |
| 213 | 139 self.ival = None |
| 148 | 140 self.isLocal = False |
| 141 self.isReadOnly = False | |
| 142 self.isParameter = False | |
| 143 def __repr__(self): | |
| 225 | 144 return 'Var {} [{}]'.format(self.name, self.typ) |
| 148 | 145 |
| 150 | 146 # Procedure types |
| 147 class Function(Symbol): | |
| 213 | 148 """ Actual implementation of a function """ |
| 149 def __init__(self, name, loc): | |
| 150 super().__init__(name) | |
| 151 self.loc = loc | |
| 215 | 152 self.declarations = [] |
| 213 | 153 |
| 154 def __repr__(self): | |
| 217 | 155 return 'Func {}'.format(self.name) |
| 148 | 156 |
| 163 | 157 # Operations / Expressions: |
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158 class Expression(Node): |
| 230 | 159 def __init__(self, loc): |
| 160 self.loc = loc | |
| 161 | |
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162 |
| 225 | 163 class Deref(Expression): |
| 164 def __init__(self, ptr, loc): | |
| 230 | 165 super().__init__(loc) |
| 225 | 166 assert isinstance(ptr, Expression) |
| 167 self.ptr = ptr | |
| 168 def __repr__(self): | |
| 169 return 'DEREF {}'.format(self.ptr) | |
| 170 | |
| 230 | 171 |
| 172 class TypeCast(Expression): | |
| 173 def __init__(self, to_type, x, loc): | |
| 174 super().__init__(loc) | |
| 175 self.to_type = to_type | |
| 176 self.a = x | |
| 177 def __repr__(self): | |
| 178 return 'TYPECAST {}'.format(self.to_type) | |
| 179 | |
| 180 | |
| 225 | 181 class FieldRef(Expression): |
| 182 def __init__(self, base, field, loc): | |
| 230 | 183 super().__init__(loc) |
| 225 | 184 assert isinstance(base, Expression) |
| 185 assert isinstance(field, str) | |
| 186 self.base = base | |
| 187 self.field = field | |
| 188 def __repr__(self): | |
| 189 return 'FIELD {}.{}'.format(self.base, self.field) | |
| 190 | |
| 230 | 191 |
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192 class Unop(Expression): |
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193 def __init__(self, op, a, loc): |
| 230 | 194 super().__init__(loc) |
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195 assert isinstance(a, Expression) |
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196 assert isinstance(op, str) |
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197 self.a = a |
| 230 | 198 self.op = op |
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199 def __repr__(self): |
| 212 | 200 return 'UNOP {}'.format(self.op) |
| 148 | 201 |
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202 class Binop(Expression): |
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203 def __init__(self, a, op, b, loc): |
| 230 | 204 super().__init__(loc) |
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205 assert isinstance(a, Expression), type(a) |
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206 assert isinstance(b, Expression) |
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207 assert isinstance(op, str) |
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208 self.a = a |
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209 self.b = b |
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210 self.op = op # Operation: '+', '-', '*', '/', 'mod' |
| 148 | 211 |
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212 def __repr__(self): |
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213 return 'BINOP {}'.format(self.op) |
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214 |
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215 class VariableUse(Expression): |
| 228 | 216 def __init__(self, target, loc): |
| 230 | 217 super().__init__(loc) |
| 228 | 218 self.target = target |
| 219 def __repr__(self): | |
| 220 nm = self.target | |
| 221 return 'VAR USE {}'.format(nm) | |
| 163 | 222 |
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223 class Literal(Expression): |
| 228 | 224 def __init__(self, val, loc): |
| 230 | 225 super().__init__(loc) |
| 228 | 226 self.val = val |
| 227 def __repr__(self): | |
| 228 return 'LITERAL {}'.format(self.val) | |
| 150 | 229 |
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230 class FunctionCall(Expression): |
| 228 | 231 def __init__(self, proc, args, loc): |
| 230 | 232 super().__init__(loc) |
| 228 | 233 self.proc = proc |
| 234 self.args = args | |
| 235 def __repr__(self): | |
| 236 return 'CALL {0} '.format(self.proc) | |
| 148 | 237 |
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238 # Statements |
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239 class Statement(Node): |
| 228 | 240 def __init__(self, loc): |
| 241 self.loc = loc | |
| 242 | |
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243 |
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244 class CompoundStatement(Statement): |
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245 def __init__(self, statements): |
| 249 | 246 super().__init__(None) |
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247 self.statements = statements |
| 228 | 248 for s in self.statements: |
| 249 assert isinstance(s, Statement) | |
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250 |
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251 def __repr__(self): |
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252 return 'COMPOUND STATEMENT' |
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253 |
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254 |
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255 class ReturnStatement(Statement): |
| 228 | 256 def __init__(self, expr, loc): |
| 257 super().__init__(loc) | |
| 258 self.expr = expr | |
| 259 | |
| 260 def __repr__(self): | |
| 261 return 'RETURN STATEMENT' | |
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262 |
| 222 | 263 class Assignment(Statement): |
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264 def __init__(self, lval, rval, loc): |
| 228 | 265 super().__init__(loc) |
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266 assert isinstance(lval, Node) |
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267 assert isinstance(rval, Node) |
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268 self.lval = lval |
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269 self.rval = rval |
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270 |
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271 def __repr__(self): |
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272 return 'ASSIGNMENT' |
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273 |
| 222 | 274 class ExpressionStatement(Statement): |
| 275 def __init__(self, ex, loc): | |
| 228 | 276 super().__init__(loc) |
| 222 | 277 self.ex = ex |
| 228 | 278 |
| 222 | 279 def __repr__(self): |
| 280 return 'Epression' | |
| 281 | |
| 228 | 282 |
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283 class IfStatement(Statement): |
| 228 | 284 def __init__(self, condition, truestatement, falsestatement, loc): |
| 285 super().__init__(loc) | |
| 286 self.condition = condition | |
| 287 self.truestatement = truestatement | |
| 288 self.falsestatement = falsestatement | |
| 289 | |
| 290 def __repr__(self): | |
| 291 return 'IF-statement' | |
| 292 | |
| 148 | 293 |
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294 class WhileStatement(Statement): |
| 228 | 295 def __init__(self, condition, statement, loc): |
| 296 super().__init__(loc) | |
| 297 self.condition = condition | |
| 298 self.statement = statement | |
| 148 | 299 |
| 228 | 300 def __repr__(self): |
| 301 return 'WHILE-statement' | |
| 302 |