Mercurial > lcfOS
annotate python/c3/astnodes.py @ 220:3f6c30a5d234
Major change in expression parsing to enable pointers and structs
| author | Windel Bouwman |
|---|---|
| date | Sat, 06 Jul 2013 21:32:20 +0200 |
| parents | 8b2e5f3cd579 |
| children | 848c4b15fd0b |
| 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): | |
| 62 self.ptype = ptype | |
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63 def __repr__(self): |
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64 return '({}*)'.format(self.ptype) |
| 213 | 65 |
| 66 class StructureType(Type): | |
| 67 def __init__(self, mems): | |
| 68 self.mems = mems | |
| 69 | |
| 148 | 70 class DefinedType(Type): |
| 71 def __init__(self, name, typ): | |
| 72 self.name = name | |
| 73 self.typ = typ | |
| 74 def __repr__(self): | |
| 75 return 'Named type {0} of type {1}'.format(self.name, self.typ) | |
| 76 | |
| 77 # Variables, parameters, local variables, constants: | |
| 78 class Symbol(Node): | |
| 213 | 79 def __init__(self, name): |
| 163 | 80 self.name = name |
| 81 self.refs = [] | |
| 213 | 82 def addRef(self, r): |
| 163 | 83 self.refs.append(r) |
| 213 | 84 @property |
| 85 def References(self): | |
| 163 | 86 return self.refs |
| 148 | 87 |
| 88 class Constant(Symbol): | |
| 213 | 89 def __init__(self, name, typ, value): |
| 163 | 90 super().__init__(name) |
| 91 self.typ = typ | |
| 148 | 92 self.value = value |
| 213 | 93 def __repr__(self): |
| 148 | 94 return 'CONSTANT {0} = {1}'.format(self.name, self.value) |
| 95 | |
| 96 class Variable(Symbol): | |
| 213 | 97 def __init__(self, name, typ): |
| 163 | 98 super().__init__(name) |
| 148 | 99 self.typ = typ |
| 213 | 100 self.ival = None |
| 148 | 101 self.isLocal = False |
| 102 self.isReadOnly = False | |
| 103 self.isParameter = False | |
| 104 def __repr__(self): | |
| 217 | 105 return 'Var {}'.format(self.name) |
| 148 | 106 |
| 150 | 107 # Procedure types |
| 108 class Function(Symbol): | |
| 213 | 109 """ Actual implementation of a function """ |
| 110 def __init__(self, name, loc): | |
| 111 super().__init__(name) | |
| 112 self.loc = loc | |
| 215 | 113 self.declarations = [] |
| 213 | 114 |
| 115 def __repr__(self): | |
| 217 | 116 return 'Func {}'.format(self.name) |
| 148 | 117 |
| 163 | 118 # Operations / Expressions: |
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119 class Expression(Node): |
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120 pass |
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121 |
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122 class Unop(Expression): |
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123 def __init__(self, op, a, loc): |
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124 assert isinstance(a, Expression) |
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125 assert isinstance(op, str) |
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126 self.a = a |
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127 self.op = op |
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128 self.loc = loc |
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129 def __repr__(self): |
| 212 | 130 return 'UNOP {}'.format(self.op) |
| 148 | 131 |
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132 class Binop(Expression): |
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133 def __init__(self, a, op, b, loc): |
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134 assert isinstance(a, Expression), type(a) |
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135 assert isinstance(b, Expression) |
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136 assert isinstance(op, str) |
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137 self.a = a |
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138 self.b = b |
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139 self.op = op # Operation: '+', '-', '*', '/', 'mod' |
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140 self.loc = loc |
| 148 | 141 |
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142 def __repr__(self): |
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143 return 'BINOP {}'.format(self.op) |
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144 |
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145 class VariableUse(Expression): |
| 213 | 146 def __init__(self, target, loc): |
| 150 | 147 self.target = target |
| 213 | 148 self.loc = loc |
| 150 | 149 def __repr__(self): |
| 163 | 150 nm = self.target.name if hasattr(self.target, 'name') else '' |
| 212 | 151 return 'VAR USE {}'.format(nm) |
| 163 | 152 |
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153 class Literal(Expression): |
| 213 | 154 def __init__(self, val, loc): |
| 163 | 155 self.val = val |
| 213 | 156 self.loc = loc |
| 163 | 157 def __repr__(self): |
| 212 | 158 return 'LITERAL {}'.format(self.val) |
| 150 | 159 |
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160 class FunctionCall(Expression): |
| 213 | 161 def __init__(self, proc, args, loc): |
| 148 | 162 self.proc = proc |
| 163 self.args = args | |
| 213 | 164 self.loc = loc |
| 148 | 165 def __repr__(self): |
| 166 return 'CALL {0} '.format(self.proc) | |
| 167 | |
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168 # Statements |
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169 class Statement(Node): |
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170 pass |
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171 |
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172 class CompoundStatement(Statement): |
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173 def __init__(self, statements): |
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174 self.statements = statements |
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175 |
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176 def __repr__(self): |
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177 return 'COMPOUND STATEMENT' |
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178 |
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179 class EmptyStatement(Statement): |
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180 def __repr__(self): |
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181 return 'NOP' |
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182 |
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183 class ReturnStatement(Statement): |
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184 def __init__(self, expr, loc): |
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185 self.expr = expr |
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186 self.loc = loc |
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187 def __repr__(self): |
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188 return 'RETURN STATEMENT' |
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189 |
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190 class Assignment(Node): |
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191 def __init__(self, lval, rval, loc): |
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192 assert isinstance(lval, Node) |
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193 assert isinstance(rval, Node) |
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194 assert isinstance(loc, SourceLocation) |
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195 self.lval = lval |
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196 self.rval = rval |
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197 self.loc = loc |
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198 |
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199 def __repr__(self): |
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200 return 'ASSIGNMENT' |
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201 |
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202 class IfStatement(Statement): |
| 213 | 203 def __init__(self, condition, truestatement, falsestatement, loc): |
| 148 | 204 self.condition = condition |
| 205 self.truestatement = truestatement | |
| 206 self.falsestatement = falsestatement | |
| 213 | 207 self.loc = loc |
| 148 | 208 def __repr__(self): |
| 209 return 'IF-statement' | |
| 210 | |
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211 class WhileStatement(Statement): |
| 213 | 212 def __init__(self, condition, statement, loc): |
| 148 | 213 self.condition = condition |
| 213 | 214 self.statement = statement |
| 215 self.loc = loc | |
| 148 | 216 def __repr__(self): |
| 217 return 'WHILE-statement' | |
| 218 |