Mercurial > lcfOS
annotate python/c3/astnodes.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 |
|---|---|
| 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 = [] | |
| 19 def __repr__(self): | |
| 20 return 'PACKAGE {}'.format(self.name) | |
| 21 | |
| 150 | 22 class Designator(Node): |
| 213 | 23 def __init__(self, tname, loc): |
| 24 self.tname = tname | |
| 25 self.loc = loc | |
| 26 def __repr__(self): | |
| 27 return 'DESIGNATOR {}'.format(self.tname) | |
| 148 | 28 |
| 29 """ | |
| 30 Type classes | |
| 213 | 31 |
| 32 types must be comparable. | |
| 33 | |
| 34 There are the following types: | |
| 35 - base type | |
| 36 - struct type | |
| 37 - pointer type | |
| 38 - typedef type | |
| 39 - function type | |
| 148 | 40 """ |
| 41 | |
| 149 | 42 class Type(Node): |
| 148 | 43 def isType(self, b): |
| 44 return isType(self, b) | |
| 45 | |
| 46 class BaseType(Type): | |
| 47 def __init__(self, name): | |
| 48 self.name = name | |
| 49 def __repr__(self): | |
| 212 | 50 return '{}'.format(self.name) |
| 148 | 51 |
| 52 class FunctionType(Type): | |
| 167 | 53 def __init__(self, parametertypes, returntype): |
| 54 self.parametertypes = parametertypes | |
| 148 | 55 self.returntype = returntype |
| 56 def __repr__(self): | |
| 167 | 57 params = ', '.join([str(v) for v in self.parametertypes]) |
| 165 | 58 return '{1} f({0})'.format(params, self.returntype) |
| 148 | 59 |
| 213 | 60 class PointerType(Type): |
| 61 def __init__(self, ptype): | |
| 225 | 62 assert isinstance(ptype, Type) or isinstance(ptype, Designator) |
| 213 | 63 self.ptype = ptype |
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64 def __repr__(self): |
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65 return '({}*)'.format(self.ptype) |
| 213 | 66 |
| 67 class StructureType(Type): | |
| 68 def __init__(self, mems): | |
| 69 self.mems = mems | |
| 225 | 70 def hasField(self, name): |
| 71 for fn, ft in self.mems: | |
| 72 if name == fn: | |
| 73 return True | |
| 74 return False | |
| 75 def fieldType(self, name): | |
| 76 for fn, ft in self.mems: | |
| 77 if name == fn: | |
| 78 return ft | |
| 79 raise Exception() | |
| 80 | |
| 213 | 81 |
| 148 | 82 class DefinedType(Type): |
| 225 | 83 def __init__(self, name, typ, loc): |
| 84 assert isinstance(name, str) | |
| 85 self.name = name | |
| 86 self.typ = typ | |
| 87 self.loc = loc | |
| 88 def __repr__(self): | |
| 89 return 'Named type {0} of type {1}'.format(self.name, self.typ) | |
| 148 | 90 |
| 222 | 91 class TypeCast(Node): |
| 92 def __init__(self, to_type, x): | |
| 93 self.to_type = to_type | |
| 94 self.a = x | |
| 95 def __repr__(self): | |
| 96 return 'TYPECAST' | |
| 221 | 97 |
| 148 | 98 # Variables, parameters, local variables, constants: |
| 99 class Symbol(Node): | |
| 213 | 100 def __init__(self, name): |
| 163 | 101 self.name = name |
| 102 self.refs = [] | |
| 213 | 103 def addRef(self, r): |
| 163 | 104 self.refs.append(r) |
| 213 | 105 @property |
| 106 def References(self): | |
| 163 | 107 return self.refs |
| 148 | 108 |
| 109 class Constant(Symbol): | |
| 213 | 110 def __init__(self, name, typ, value): |
| 163 | 111 super().__init__(name) |
| 112 self.typ = typ | |
| 148 | 113 self.value = value |
| 213 | 114 def __repr__(self): |
| 148 | 115 return 'CONSTANT {0} = {1}'.format(self.name, self.value) |
| 116 | |
| 117 class Variable(Symbol): | |
| 213 | 118 def __init__(self, name, typ): |
| 163 | 119 super().__init__(name) |
| 148 | 120 self.typ = typ |
| 213 | 121 self.ival = None |
| 148 | 122 self.isLocal = False |
| 123 self.isReadOnly = False | |
| 124 self.isParameter = False | |
| 125 def __repr__(self): | |
| 225 | 126 return 'Var {} [{}]'.format(self.name, self.typ) |
| 148 | 127 |
| 150 | 128 # Procedure types |
| 129 class Function(Symbol): | |
| 213 | 130 """ Actual implementation of a function """ |
| 131 def __init__(self, name, loc): | |
| 132 super().__init__(name) | |
| 133 self.loc = loc | |
| 215 | 134 self.declarations = [] |
| 213 | 135 |
| 136 def __repr__(self): | |
| 217 | 137 return 'Func {}'.format(self.name) |
| 148 | 138 |
| 163 | 139 # Operations / Expressions: |
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140 class Expression(Node): |
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141 pass |
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142 |
| 225 | 143 class Deref(Expression): |
| 144 def __init__(self, ptr, loc): | |
| 145 assert isinstance(ptr, Expression) | |
| 146 self.ptr = ptr | |
| 147 self.loc = loc | |
| 148 def __repr__(self): | |
| 149 return 'DEREF {}'.format(self.ptr) | |
| 150 | |
| 151 class FieldRef(Expression): | |
| 152 def __init__(self, base, field, loc): | |
| 153 assert isinstance(base, Expression) | |
| 154 assert isinstance(field, str) | |
| 155 self.base = base | |
| 156 self.field = field | |
| 157 self.loc = loc | |
| 158 def __repr__(self): | |
| 159 return 'FIELD {}.{}'.format(self.base, self.field) | |
| 160 | |
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161 class Unop(Expression): |
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162 def __init__(self, op, a, loc): |
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163 assert isinstance(a, Expression) |
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164 assert isinstance(op, str) |
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165 self.a = a |
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166 self.op = op |
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167 self.loc = loc |
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168 def __repr__(self): |
| 212 | 169 return 'UNOP {}'.format(self.op) |
| 148 | 170 |
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171 class Binop(Expression): |
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172 def __init__(self, a, op, b, loc): |
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173 assert isinstance(a, Expression), type(a) |
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174 assert isinstance(b, Expression) |
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175 assert isinstance(op, str) |
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176 self.a = a |
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177 self.b = b |
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178 self.op = op # Operation: '+', '-', '*', '/', 'mod' |
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179 self.loc = loc |
| 148 | 180 |
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181 def __repr__(self): |
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182 return 'BINOP {}'.format(self.op) |
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183 |
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184 class VariableUse(Expression): |
| 213 | 185 def __init__(self, target, loc): |
| 150 | 186 self.target = target |
| 213 | 187 self.loc = loc |
| 150 | 188 def __repr__(self): |
| 163 | 189 nm = self.target.name if hasattr(self.target, 'name') else '' |
| 212 | 190 return 'VAR USE {}'.format(nm) |
| 163 | 191 |
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192 class Literal(Expression): |
| 213 | 193 def __init__(self, val, loc): |
| 163 | 194 self.val = val |
| 213 | 195 self.loc = loc |
| 163 | 196 def __repr__(self): |
| 212 | 197 return 'LITERAL {}'.format(self.val) |
| 150 | 198 |
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199 class FunctionCall(Expression): |
| 213 | 200 def __init__(self, proc, args, loc): |
| 148 | 201 self.proc = proc |
| 202 self.args = args | |
| 213 | 203 self.loc = loc |
| 148 | 204 def __repr__(self): |
| 205 return 'CALL {0} '.format(self.proc) | |
| 206 | |
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207 # Statements |
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208 class Statement(Node): |
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209 pass |
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210 |
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211 class CompoundStatement(Statement): |
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212 def __init__(self, statements): |
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213 self.statements = statements |
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214 |
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215 def __repr__(self): |
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216 return 'COMPOUND STATEMENT' |
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217 |
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218 class EmptyStatement(Statement): |
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219 def __repr__(self): |
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220 return 'NOP' |
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221 |
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222 class ReturnStatement(Statement): |
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223 def __init__(self, expr, loc): |
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224 self.expr = expr |
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225 self.loc = loc |
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226 def __repr__(self): |
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227 return 'RETURN STATEMENT' |
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228 |
| 222 | 229 class Assignment(Statement): |
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230 def __init__(self, lval, rval, loc): |
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231 assert isinstance(lval, Node) |
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232 assert isinstance(rval, Node) |
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233 assert isinstance(loc, SourceLocation) |
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234 self.lval = lval |
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235 self.rval = rval |
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236 self.loc = loc |
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237 |
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238 def __repr__(self): |
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239 return 'ASSIGNMENT' |
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240 |
| 222 | 241 class ExpressionStatement(Statement): |
| 242 def __init__(self, ex, loc): | |
| 243 self.ex = ex | |
| 244 self.loc = loc | |
| 245 assert isinstance(loc, SourceLocation) | |
| 246 def __repr__(self): | |
| 247 return 'Epression' | |
| 248 | |
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249 class IfStatement(Statement): |
| 213 | 250 def __init__(self, condition, truestatement, falsestatement, loc): |
| 148 | 251 self.condition = condition |
| 252 self.truestatement = truestatement | |
| 253 self.falsestatement = falsestatement | |
| 213 | 254 self.loc = loc |
| 148 | 255 def __repr__(self): |
| 256 return 'IF-statement' | |
| 257 | |
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258 class WhileStatement(Statement): |
| 213 | 259 def __init__(self, condition, statement, loc): |
| 148 | 260 self.condition = condition |
| 213 | 261 self.statement = statement |
| 262 self.loc = loc | |
| 148 | 263 def __repr__(self): |
| 264 return 'WHILE-statement' | |
| 265 |