Mercurial > lcfOS
annotate python/c3/codegenerator.py @ 225:1c7364bd74c7
Fixed pointer deref
| author | Windel Bouwman |
|---|---|
| date | Thu, 11 Jul 2013 07:42:30 +0200 |
| parents | c3f1ce8b638f |
| children | 82dfe6a32717 |
| rev | line source |
|---|---|
| 155 | 1 import ir |
| 2 from . import astnodes | |
| 222 | 3 from .scope import boolType, intType |
|
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Major change in expression parsing to enable pointers and structs
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parents:
217
diff
changeset
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4 from ppci import CompilerError |
| 171 | 5 |
| 170 | 6 class CodeGenerator: |
| 217 | 7 """ Generates intermediate code from a package """ |
| 8 def gencode(self, pkg): | |
| 9 assert type(pkg) is astnodes.Package | |
| 10 self.varMap = {} # Maps variables to storage locations. | |
| 11 self.funcMap = {} | |
| 12 self.builder = ir.Builder() | |
| 13 m = ir.Module(pkg.name) | |
| 14 self.builder.setModule(m) | |
| 15 self.genModule(pkg) | |
| 16 return m | |
| 170 | 17 |
| 217 | 18 # inner helpers: |
| 19 def genModule(self, pkg): | |
| 222 | 20 # Take care of forward declarations: |
| 21 for s in pkg.innerScope.Functions: | |
| 204 | 22 f = self.builder.newFunction(s.name) |
| 175 | 23 self.funcMap[s] = f |
| 222 | 24 for s in pkg.innerScope: |
| 170 | 25 if type(s) is astnodes.Variable: |
| 205 | 26 v = self.builder.newVariable(s.name) |
| 186 | 27 #self.builder.addIns(ir.Alloc(v)) |
| 28 self.varMap[s] = v | |
| 170 | 29 elif type(s) is astnodes.Function: |
| 30 # TODO: handle arguments | |
| 175 | 31 f = self.funcMap[s] |
| 204 | 32 self.builder.setFunction(f) |
| 171 | 33 bb = self.builder.newBB() |
| 172 | 34 f.entry = bb |
| 171 | 35 self.builder.setBB(bb) |
| 174 | 36 # generate room for locals: |
| 37 | |
| 217 | 38 for sym in s.innerScope: |
| 175 | 39 #print(sym, sym.isParameter) |
| 40 # TODO: handle parameters different | |
| 174 | 41 v = self.builder.newTmp(sym.name) |
| 42 self.builder.addIns(ir.Alloc(v)) | |
| 43 self.varMap[sym] = v | |
| 44 | |
| 170 | 45 self.genCode(s.body) |
| 172 | 46 # TODO handle return? |
| 171 | 47 self.builder.addIns(ir.Return()) |
| 204 | 48 self.builder.setFunction(None) |
| 170 | 49 else: |
| 50 print(s) | |
| 158 | 51 |
| 217 | 52 def genCode(self, code): |
| 222 | 53 assert isinstance(code, astnodes.Statement) |
| 54 if type(code) is astnodes.CompoundStatement: | |
| 221 | 55 for s in code.statements: |
| 56 self.genCode(s) | |
| 222 | 57 elif type(code) is astnodes.Assignment: |
| 170 | 58 re = self.genExprCode(code.rval) |
|
220
3f6c30a5d234
Major change in expression parsing to enable pointers and structs
Windel Bouwman
parents:
217
diff
changeset
|
59 # TODO: Handle pointers |
| 221 | 60 loc = self.genExprCode(code.lval) |
| 61 # determine location of variable | |
| 174 | 62 self.builder.addIns(ir.Store(loc, re)) |
| 222 | 63 elif type(code) is astnodes.ExpressionStatement: |
| 64 self.genExprCode(code.ex) | |
| 65 elif type(code) is astnodes.IfStatement: | |
| 171 | 66 bbtrue = self.builder.newBB() |
| 67 bbfalse = self.builder.newBB() | |
| 68 te = self.builder.newBB() | |
| 69 self.genCondCode(code.condition, bbtrue, bbfalse) | |
| 70 self.builder.setBB(bbtrue) | |
| 170 | 71 self.genCode(code.truestatement) |
| 171 | 72 self.builder.addIns(ir.Branch(te)) |
| 73 self.builder.setBB(bbfalse) | |
| 170 | 74 self.genCode(code.falsestatement) |
| 171 | 75 self.builder.addIns(ir.Branch(te)) |
| 76 self.builder.setBB(te) | |
| 222 | 77 elif type(code) is astnodes.EmptyStatement: |
| 170 | 78 pass |
| 222 | 79 elif type(code) is astnodes.ReturnStatement: |
| 174 | 80 if code.expr: |
| 81 re = self.genExprCode(code.expr) | |
| 82 self.builder.addIns(ir.Return(re)) | |
| 83 else: | |
| 84 self.builder.addIns(ir.Return()) | |
| 222 | 85 elif type(code) is astnodes.WhileStatement: |
| 176 | 86 bbdo = self.builder.newBB() |
| 87 bbtest = self.builder.newBB() | |
| 88 te = self.builder.newBB() | |
| 89 self.builder.addIns(ir.Branch(bbtest)) | |
| 90 self.builder.setBB(bbtest) | |
| 91 self.genCondCode(code.condition, bbdo, te) | |
| 92 self.builder.setBB(bbdo) | |
| 217 | 93 self.genCode(code.statement) |
| 176 | 94 self.builder.addIns(ir.Branch(bbtest)) |
| 95 self.builder.setBB(te) | |
| 222 | 96 else: |
| 170 | 97 print('Unknown stmt:', code) |
| 217 | 98 def genCondCode(self, expr, bbtrue, bbfalse): |
| 171 | 99 # Implement sequential logical operators |
| 100 assert expr.typ == boolType | |
| 101 if type(expr) is astnodes.Binop: | |
| 102 if expr.op == 'or': | |
| 103 l2 = self.builder.newBB() | |
| 104 self.genCondCode(expr.a, bbtrue, l2) | |
| 105 self.builder.setBB(l2) | |
| 106 self.genCondCode(expr.b, bbtrue, bbfalse) | |
| 107 elif expr.op == 'and': | |
| 108 l2 = self.builder.newBB() | |
| 109 self.genCondCode(expr.a, l2, bbfalse) | |
| 110 self.builder.setBB(l2) | |
| 111 self.genCondCode(expr.b, bbtrue, bbfalse) | |
| 112 elif expr.op in ['==', '>', '<']: | |
| 113 ta = self.genExprCode(expr.a) | |
| 114 tb = self.genExprCode(expr.b) | |
| 115 i = ir.ConditionalBranch(ta, expr.op, tb, bbtrue, bbfalse) | |
| 116 self.builder.addIns(i) | |
| 117 else: | |
| 174 | 118 raise NotImlementedError('Unknown condition {0}'.format(expr)) |
| 171 | 119 elif type(expr) is astnodes.Literal: |
| 120 if expr.val: | |
| 205 | 121 self.builder.addIns(ir.Branch(bbtrue)) |
| 171 | 122 else: |
| 205 | 123 self.builder.addIns(ir.Branch(bbfalse)) |
| 171 | 124 else: |
| 125 print('Unknown cond', expr) | |
| 217 | 126 def genExprCode(self, expr): |
| 225 | 127 if type(expr) is astnodes.Binop: |
| 170 | 128 ra = self.genExprCode(expr.a) |
| 129 rb = self.genExprCode(expr.b) | |
| 221 | 130 ops = ['+', '-', '*', '/', '|', '&'] |
| 170 | 131 if expr.op in ops: |
| 221 | 132 tmpnames = {'+':'add', '-':'sub', '*': 'mul', '/':'div', '|':'or', '&':'and'} |
| 177 | 133 tmp = self.builder.newTmp(tmpnames[expr.op]) |
| 170 | 134 op = expr.op |
| 135 ins = ir.BinaryOperator(tmp, op, ra, rb) | |
| 171 | 136 self.builder.addIns(ins) |
| 170 | 137 return tmp |
| 138 else: | |
| 171 | 139 print('Unknown {0}'.format(expr)) |
| 177 | 140 tmp = self.builder.newTmp() |
| 171 | 141 # TODO |
| 142 return tmp | |
| 225 | 143 elif type(expr) is astnodes.Unop: |
| 144 ra = self.genExprCode(expr.a) | |
| 145 if expr.op == '&': | |
| 146 # Address of operator | |
| 147 tmp = self.builder.newTmp('addr') | |
| 148 return tmp | |
| 149 #self.builder.addIns(ins) | |
| 150 else: | |
| 151 raise Exception('Unknown {0}'.format(expr)) | |
| 152 elif type(expr) is astnodes.Constant: | |
| 153 tmp = self.builder.newTmp() | |
| 154 # TODO | |
|
220
3f6c30a5d234
Major change in expression parsing to enable pointers and structs
Windel Bouwman
parents:
217
diff
changeset
|
155 return tmp |
| 225 | 156 elif type(expr) is astnodes.VariableUse: |
| 157 tmp = self.builder.newTmp() | |
| 158 loc = self.varMap[expr.target] | |
| 159 i = ir.Load(loc, tmp) | |
| 160 self.builder.addIns(i) | |
| 161 return tmp | |
| 162 elif type(expr) is astnodes.Deref: | |
| 222 | 163 # dereference pointer type: |
| 225 | 164 addr = self.genExprCode(expr.ptr) |
| 222 | 165 tmp = self.builder.newTmp('deref') |
| 225 | 166 ins = ir.Load(addr, tmp) |
| 222 | 167 self.builder.addIns(ins) |
| 168 return tmp | |
| 225 | 169 elif type(expr) is astnodes.Literal: |
| 170 tmp = self.builder.newTmp() | |
| 171 ins = ir.ImmLoad(tmp, expr.val) | |
| 172 self.builder.addIns(ins) | |
| 173 return tmp | |
| 174 elif type(expr) is astnodes.TypeCast: | |
| 222 | 175 ar = self.genExprCode(expr.a) |
| 176 if isinstance(expr.to_type, astnodes.PointerType): | |
| 177 if expr.a.typ is intType: | |
| 178 return ar | |
| 179 elif isinstance(expr.a.typ, astnodes.PointerType): | |
| 180 return ar | |
| 181 else: | |
| 182 raise Exception() | |
| 225 | 183 elif type(expr) is astnodes.FunctionCall: |
| 175 | 184 tmp = self.builder.newTmp("res") |
| 185 args = [] | |
| 186 for arg in expr.args: | |
| 187 ar = self.genExprCode(arg) | |
| 188 args.append(ar) | |
| 189 fn = self.funcMap[expr.proc] | |
| 190 ins = ir.Call(fn, args, tmp) | |
| 191 self.builder.addIns(ins) | |
| 192 return tmp | |
| 225 | 193 else: |
|
220
3f6c30a5d234
Major change in expression parsing to enable pointers and structs
Windel Bouwman
parents:
217
diff
changeset
|
194 raise CompilerError('Unknown expr {}'.format(expr)) |
| 157 | 195 |