Mercurial > lcfOS
annotate python/c3/codegenerator.py @ 269:5f8c04a8d26b
Towards better modularity
| author | Windel Bouwman |
|---|---|
| date | Sun, 18 Aug 2013 17:43:18 +0200 |
| parents | 5ec7580976d9 |
| children | e64bae57cda8 |
| rev | line source |
|---|---|
| 255 | 1 import logging |
| 155 | 2 import ir |
| 3 from . import astnodes | |
| 222 | 4 from .scope import boolType, intType |
|
220
3f6c30a5d234
Major change in expression parsing to enable pointers and structs
Windel Bouwman
parents:
217
diff
changeset
|
5 from ppci import CompilerError |
| 231 | 6 from .typecheck import theType |
| 230 | 7 |
| 228 | 8 |
| 268 | 9 class CodeGenerator(ir.Builder): |
| 261 | 10 """ Generates intermediate code from a package """ |
| 255 | 11 def __init__(self): |
| 261 | 12 self.logger = logging.getLogger('c3cgen') |
| 13 | |
| 217 | 14 def gencode(self, pkg): |
| 268 | 15 self.prepare() |
| 217 | 16 assert type(pkg) is astnodes.Package |
| 255 | 17 self.logger.info('Generating ir-code for {}'.format(pkg.name)) |
| 217 | 18 self.varMap = {} # Maps variables to storage locations. |
| 19 self.funcMap = {} | |
| 268 | 20 self.m = ir.Module(pkg.name) |
| 217 | 21 self.genModule(pkg) |
| 268 | 22 return self.m |
| 170 | 23 |
| 217 | 24 # inner helpers: |
| 25 def genModule(self, pkg): | |
| 268 | 26 # Take care of forward declarations: |
| 27 for s in pkg.innerScope.Functions: | |
| 28 f = self.newFunction(s.name) | |
| 175 | 29 self.funcMap[s] = f |
| 268 | 30 for s in pkg.innerScope: |
| 31 if type(s) is astnodes.Variable: | |
| 32 #v = self.builder.newTmp(s.name) | |
| 33 self.varMap[s] = self.newTemp() | |
| 34 pass | |
| 35 elif type(s) is astnodes.Function: | |
| 36 self.genFunction(s) | |
| 37 else: | |
| 38 raise NotImplementedError(str(s)) | |
| 174 | 39 |
| 268 | 40 def genFunction(self, fn): |
| 41 # TODO: handle arguments | |
| 42 f = self.funcMap[fn] | |
| 269 | 43 # TODO reserve room for stack, this can be done at later point? |
| 268 | 44 self.setFunction(f) |
| 269 | 45 l2 = self.newBlock() |
| 46 self.emit(ir.Jump(l2)) | |
| 47 self.setBlock(l2) | |
| 268 | 48 # generate room for locals: |
| 174 | 49 |
| 268 | 50 for sym in fn.innerScope: |
| 51 # TODO: handle parameters different | |
| 52 v = self.newTemp() | |
| 53 # TODO: make this ssa here?? | |
| 54 self.varMap[sym] = v | |
| 55 | |
| 56 self.genCode(fn.body) | |
| 57 # TODO handle return? | |
| 269 | 58 self.emit(ir.Jump(f.epiloog)) |
| 59 #self.emit(ir.Return(ir.Const(0))) | |
| 268 | 60 self.setFunction(None) |
| 158 | 61 |
| 217 | 62 def genCode(self, code): |
| 222 | 63 assert isinstance(code, astnodes.Statement) |
| 268 | 64 self.setLoc(code.loc) |
| 222 | 65 if type(code) is astnodes.CompoundStatement: |
| 221 | 66 for s in code.statements: |
| 67 self.genCode(s) | |
| 222 | 68 elif type(code) is astnodes.Assignment: |
| 268 | 69 rval = self.genExprCode(code.rval) |
| 70 lval = self.genExprCode(code.lval) | |
| 71 self.emit(ir.Move(lval, rval)) | |
| 222 | 72 elif type(code) is astnodes.ExpressionStatement: |
| 73 self.genExprCode(code.ex) | |
| 74 elif type(code) is astnodes.IfStatement: | |
| 268 | 75 bbtrue = self.newBlock() |
| 76 bbfalse = self.newBlock() | |
| 77 te = self.newBlock() | |
| 78 self.genCondCode(code.condition, bbtrue, bbfalse) | |
| 79 self.setBlock(bbtrue) | |
| 80 self.genCode(code.truestatement) | |
| 81 self.emit(ir.Jump(te)) | |
| 82 self.setBlock(bbfalse) | |
| 83 if code.falsestatement: | |
| 84 self.genCode(code.falsestatement) | |
| 85 self.emit(ir.Jump(te)) | |
| 86 self.setBlock(te) | |
| 222 | 87 elif type(code) is astnodes.ReturnStatement: |
| 228 | 88 if code.expr: |
| 89 re = self.genExprCode(code.expr) | |
| 268 | 90 self.emit(ir.Return(re)) |
| 228 | 91 else: |
| 92 self.builder.addIns(ir.Return()) | |
| 222 | 93 elif type(code) is astnodes.WhileStatement: |
| 268 | 94 bbdo = self.newBlock() |
| 95 bbtest = self.newBlock() | |
| 96 te = self.newBlock() | |
| 97 self.emit(ir.Jump(bbtest)) | |
| 98 self.setBlock(bbtest) | |
| 228 | 99 self.genCondCode(code.condition, bbdo, te) |
| 268 | 100 self.setBlock(bbdo) |
| 228 | 101 self.genCode(code.statement) |
| 268 | 102 self.emit(ir.Jump(bbtest)) |
| 103 self.setBlock(te) | |
| 222 | 104 else: |
| 268 | 105 raise NotImplementedError('Unknown stmt {}'.format(code)) |
| 230 | 106 |
| 217 | 107 def genCondCode(self, expr, bbtrue, bbfalse): |
| 228 | 108 # Implement sequential logical operators |
| 109 assert expr.typ == boolType | |
| 110 if type(expr) is astnodes.Binop: | |
| 268 | 111 if expr.op == 'or': |
| 112 l2 = self.newBlock() | |
| 228 | 113 self.genCondCode(expr.a, bbtrue, l2) |
| 268 | 114 self.setBlock(l2) |
| 228 | 115 self.genCondCode(expr.b, bbtrue, bbfalse) |
| 268 | 116 elif expr.op == 'and': |
| 117 l2 = self.newBlock() | |
| 228 | 118 self.genCondCode(expr.a, l2, bbfalse) |
| 268 | 119 self.setBlock(l2) |
| 228 | 120 self.genCondCode(expr.b, bbtrue, bbfalse) |
| 268 | 121 elif expr.op in ['==', '>', '<']: |
| 228 | 122 ta = self.genExprCode(expr.a) |
| 123 tb = self.genExprCode(expr.b) | |
| 268 | 124 self.emit(ir.CJump(ta, expr.op, tb, bbtrue, bbfalse)) |
| 125 else: | |
| 126 raise NotImplementedError('Unknown condition {}'.format(expr)) | |
| 228 | 127 elif type(expr) is astnodes.Literal: |
| 128 if expr.val: | |
| 268 | 129 self.emit(ir.Jump(bbtrue)) |
| 228 | 130 else: |
| 268 | 131 self.emit(ir.Jump(bbfalse)) |
| 228 | 132 else: |
| 268 | 133 raise NotImplementedError('Unknown cond {}'.format(expr)) |
| 230 | 134 |
| 217 | 135 def genExprCode(self, expr): |
| 230 | 136 assert isinstance(expr, astnodes.Expression) |
| 268 | 137 if type(expr) is astnodes.Binop and expr.op in ir.Binop.ops: |
| 225 | 138 ra = self.genExprCode(expr.a) |
| 268 | 139 rb = self.genExprCode(expr.b) |
| 140 return ir.Binop(ra, expr.op, rb) | |
| 141 elif type(expr) is astnodes.Unop and expr.op == '&': | |
| 142 ra = self.genExprCode(expr.a) | |
| 143 # TODO: Make this work? | |
| 144 return ra | |
| 225 | 145 elif type(expr) is astnodes.VariableUse: |
| 268 | 146 return self.varMap[expr.target] |
| 225 | 147 elif type(expr) is astnodes.Deref: |
| 222 | 148 # dereference pointer type: |
| 225 | 149 addr = self.genExprCode(expr.ptr) |
| 268 | 150 return ir.Mem(addr) |
| 227 | 151 elif type(expr) is astnodes.FieldRef: |
| 230 | 152 b = self.genExprCode(expr.base) |
| 268 | 153 #b = b.e |
| 231 | 154 bt = theType(expr.base.typ) |
| 268 | 155 offset = ir.Const(bt.fieldOffset(expr.field)) |
| 156 return ir.Mem(ir.Binop(b, '+', offset)) | |
| 225 | 157 elif type(expr) is astnodes.Literal: |
| 268 | 158 return ir.Const(expr.val) |
| 225 | 159 elif type(expr) is astnodes.TypeCast: |
| 268 | 160 # TODO: improve this mess: |
| 222 | 161 ar = self.genExprCode(expr.a) |
| 231 | 162 tt = theType(expr.to_type) |
| 230 | 163 if isinstance(tt, astnodes.PointerType): |
| 222 | 164 if expr.a.typ is intType: |
| 165 return ar | |
| 166 elif isinstance(expr.a.typ, astnodes.PointerType): | |
| 167 return ar | |
| 168 else: | |
| 169 raise Exception() | |
| 230 | 170 else: |
| 233 | 171 raise NotImplementedError("not implemented") |
| 225 | 172 elif type(expr) is astnodes.FunctionCall: |
| 268 | 173 args = [self.genExprCode(e) for e in expr.args] |
| 259 | 174 fn = self.funcMap[expr.proc] |
| 268 | 175 return ir.Call(fn, args) |
| 225 | 176 else: |
| 259 | 177 raise NotImplementedError('Unknown expr {}'.format(expr)) |
| 157 | 178 |