Mercurial > lcfOS
annotate python/c3/codegenerator.py @ 232:e621e3ba78d2
Added left shift instruction
| author | Windel Bouwman |
|---|---|
| date | Sun, 14 Jul 2013 11:50:58 +0200 |
| parents | 521567d17388 |
| children | d3dccf12ca88 |
| rev | line source |
|---|---|
| 155 | 1 import ir |
| 2 from . import astnodes | |
| 222 | 3 from .scope import boolType, intType |
|
220
3f6c30a5d234
Major change in expression parsing to enable pointers and structs
Windel Bouwman
parents:
217
diff
changeset
|
4 from ppci import CompilerError |
| 231 | 5 from .typecheck import theType |
| 230 | 6 |
| 232 | 7 tmpnames = {'+':'add', '-':'sub', '*': 'mul', '/':'div', '|':'or', \ |
| 8 '&':'and', '>>':'shl', '<<':'shr'} | |
| 228 | 9 |
| 170 | 10 class CodeGenerator: |
| 217 | 11 """ Generates intermediate code from a package """ |
| 12 def gencode(self, pkg): | |
| 13 assert type(pkg) is astnodes.Package | |
| 14 self.varMap = {} # Maps variables to storage locations. | |
| 15 self.funcMap = {} | |
| 16 self.builder = ir.Builder() | |
| 17 m = ir.Module(pkg.name) | |
| 18 self.builder.setModule(m) | |
| 19 self.genModule(pkg) | |
| 20 return m | |
| 170 | 21 |
| 217 | 22 # inner helpers: |
| 23 def genModule(self, pkg): | |
| 222 | 24 # Take care of forward declarations: |
| 25 for s in pkg.innerScope.Functions: | |
| 204 | 26 f = self.builder.newFunction(s.name) |
| 175 | 27 self.funcMap[s] = f |
| 222 | 28 for s in pkg.innerScope: |
| 170 | 29 if type(s) is astnodes.Variable: |
| 230 | 30 v = self.builder.newTmp(s.name) |
| 186 | 31 #self.builder.addIns(ir.Alloc(v)) |
| 32 self.varMap[s] = v | |
| 170 | 33 elif type(s) is astnodes.Function: |
| 34 # TODO: handle arguments | |
| 175 | 35 f = self.funcMap[s] |
| 204 | 36 self.builder.setFunction(f) |
| 171 | 37 bb = self.builder.newBB() |
| 172 | 38 f.entry = bb |
| 171 | 39 self.builder.setBB(bb) |
| 174 | 40 # generate room for locals: |
| 41 | |
| 217 | 42 for sym in s.innerScope: |
| 175 | 43 #print(sym, sym.isParameter) |
| 44 # TODO: handle parameters different | |
| 174 | 45 v = self.builder.newTmp(sym.name) |
| 46 self.builder.addIns(ir.Alloc(v)) | |
| 47 self.varMap[sym] = v | |
| 48 | |
| 170 | 49 self.genCode(s.body) |
| 172 | 50 # TODO handle return? |
| 171 | 51 self.builder.addIns(ir.Return()) |
| 204 | 52 self.builder.setFunction(None) |
| 170 | 53 else: |
| 54 print(s) | |
| 158 | 55 |
| 217 | 56 def genCode(self, code): |
| 222 | 57 assert isinstance(code, astnodes.Statement) |
| 58 if type(code) is astnodes.CompoundStatement: | |
| 221 | 59 for s in code.statements: |
| 60 self.genCode(s) | |
| 222 | 61 elif type(code) is astnodes.Assignment: |
| 228 | 62 re = self.genExprCode(code.rval) |
| 63 loc = self.genExprCode(code.lval) | |
| 64 self.builder.addIns(ir.Store(loc, re)) | |
| 222 | 65 elif type(code) is astnodes.ExpressionStatement: |
| 66 self.genExprCode(code.ex) | |
| 67 elif type(code) is astnodes.IfStatement: | |
| 228 | 68 bbtrue = self.builder.newBB() |
| 69 bbfalse = self.builder.newBB() | |
| 70 te = self.builder.newBB() | |
| 71 self.genCondCode(code.condition, bbtrue, bbfalse) | |
| 72 self.builder.setBB(bbtrue) | |
| 73 self.genCode(code.truestatement) | |
| 74 self.builder.addIns(ir.Branch(te)) | |
| 75 self.builder.setBB(bbfalse) | |
| 76 if code.falsestatement: | |
| 77 self.genCode(code.falsestatement) | |
| 78 self.builder.addIns(ir.Branch(te)) | |
| 79 self.builder.setBB(te) | |
| 222 | 80 elif type(code) is astnodes.ReturnStatement: |
| 228 | 81 if code.expr: |
| 82 re = self.genExprCode(code.expr) | |
| 83 self.builder.addIns(ir.Return(re)) | |
| 84 else: | |
| 85 self.builder.addIns(ir.Return()) | |
| 222 | 86 elif type(code) is astnodes.WhileStatement: |
| 228 | 87 bbdo = self.builder.newBB() |
| 88 bbtest = self.builder.newBB() | |
| 89 te = self.builder.newBB() | |
| 90 self.builder.addIns(ir.Branch(bbtest)) | |
| 91 self.builder.setBB(bbtest) | |
| 92 self.genCondCode(code.condition, bbdo, te) | |
| 93 self.builder.setBB(bbdo) | |
| 94 self.genCode(code.statement) | |
| 95 self.builder.addIns(ir.Branch(bbtest)) | |
| 96 self.builder.setBB(te) | |
| 222 | 97 else: |
| 228 | 98 print('Unknown stmt:', code) |
| 230 | 99 |
| 217 | 100 def genCondCode(self, expr, bbtrue, bbfalse): |
| 228 | 101 # Implement sequential logical operators |
| 102 assert expr.typ == boolType | |
| 103 if type(expr) is astnodes.Binop: | |
| 104 if expr.op == 'or': | |
| 105 l2 = self.builder.newBB() | |
| 106 self.genCondCode(expr.a, bbtrue, l2) | |
| 107 self.builder.setBB(l2) | |
| 108 self.genCondCode(expr.b, bbtrue, bbfalse) | |
| 109 elif expr.op == 'and': | |
| 110 l2 = self.builder.newBB() | |
| 111 self.genCondCode(expr.a, l2, bbfalse) | |
| 112 self.builder.setBB(l2) | |
| 113 self.genCondCode(expr.b, bbtrue, bbfalse) | |
| 114 elif expr.op in ['==', '>', '<']: | |
| 115 ta = self.genExprCode(expr.a) | |
| 116 tb = self.genExprCode(expr.b) | |
| 117 i = ir.ConditionalBranch(ta, expr.op, tb, bbtrue, bbfalse) | |
| 118 self.builder.addIns(i) | |
| 119 else: | |
| 120 raise NotImlementedError('Unknown condition {0}'.format(expr)) | |
| 121 elif type(expr) is astnodes.Literal: | |
| 122 if expr.val: | |
| 123 self.builder.addIns(ir.Branch(bbtrue)) | |
| 124 else: | |
| 125 self.builder.addIns(ir.Branch(bbfalse)) | |
| 126 else: | |
| 127 print('Unknown cond', expr) | |
| 230 | 128 |
| 129 def cast_to_rvalue(self, expr, loc): | |
| 130 """ Cast lvalue to rvalue if required """ | |
| 131 if hasattr(expr, 'expect_rvalue'): | |
| 132 # Load value from memory location: | |
| 133 tmp = self.builder.newTmp() | |
| 134 i = ir.Load(loc, tmp) | |
| 135 self.builder.addIns(i) | |
| 136 return tmp | |
| 137 if expr.lvalue: | |
| 138 return loc | |
| 139 | |
| 217 | 140 def genExprCode(self, expr): |
| 230 | 141 assert isinstance(expr, astnodes.Expression) |
| 225 | 142 if type(expr) is astnodes.Binop: |
| 228 | 143 ra = self.genExprCode(expr.a) |
| 144 rb = self.genExprCode(expr.b) | |
| 232 | 145 ops = ['+', '-', '*', '/', '|', '&', '<<', '>>'] |
| 228 | 146 if expr.op in ops: |
| 147 tmp = self.builder.newTmp(tmpnames[expr.op]) | |
| 148 op = expr.op | |
| 149 ins = ir.BinaryOperator(tmp, op, ra, rb) | |
| 150 self.builder.addIns(ins) | |
| 151 return tmp | |
| 152 else: | |
| 153 print('Unknown {0}'.format(expr)) | |
| 154 tmp = self.builder.newTmp() | |
| 155 # TODO | |
| 156 return tmp | |
| 225 | 157 elif type(expr) is astnodes.Unop: |
| 158 ra = self.genExprCode(expr.a) | |
| 159 if expr.op == '&': | |
| 160 # Address of operator | |
| 161 tmp = self.builder.newTmp('addr') | |
| 162 return tmp | |
| 163 #self.builder.addIns(ins) | |
| 164 else: | |
| 165 raise Exception('Unknown {0}'.format(expr)) | |
| 166 elif type(expr) is astnodes.Constant: | |
| 167 tmp = self.builder.newTmp() | |
| 168 # TODO | |
|
220
3f6c30a5d234
Major change in expression parsing to enable pointers and structs
Windel Bouwman
parents:
217
diff
changeset
|
169 return tmp |
| 225 | 170 elif type(expr) is astnodes.VariableUse: |
| 171 loc = self.varMap[expr.target] | |
| 230 | 172 return self.cast_to_rvalue(expr, loc) |
| 225 | 173 elif type(expr) is astnodes.Deref: |
| 222 | 174 # dereference pointer type: |
| 225 | 175 addr = self.genExprCode(expr.ptr) |
| 222 | 176 tmp = self.builder.newTmp('deref') |
| 225 | 177 ins = ir.Load(addr, tmp) |
| 222 | 178 self.builder.addIns(ins) |
| 179 return tmp | |
| 227 | 180 elif type(expr) is astnodes.FieldRef: |
| 230 | 181 b = self.genExprCode(expr.base) |
| 182 offset = self.builder.newTmp('off_' + expr.field) | |
| 231 | 183 bt = theType(expr.base.typ) |
| 230 | 184 ofs = bt.fieldOffset(expr.field) |
| 185 ins = ir.ImmLoad(offset, ofs) | |
| 186 self.builder.addIns(ins) | |
| 187 tmp2 = self.builder.newTmp('adr_' + expr.field) | |
| 188 ins = ir.BinaryOperator(tmp2, '+', b, offset) | |
| 189 self.builder.addIns(ins) | |
| 190 return self.cast_to_rvalue(expr, tmp2) | |
| 225 | 191 elif type(expr) is astnodes.Literal: |
| 192 tmp = self.builder.newTmp() | |
| 193 ins = ir.ImmLoad(tmp, expr.val) | |
| 194 self.builder.addIns(ins) | |
| 195 return tmp | |
| 196 elif type(expr) is astnodes.TypeCast: | |
| 222 | 197 ar = self.genExprCode(expr.a) |
| 231 | 198 tt = theType(expr.to_type) |
| 230 | 199 if isinstance(tt, astnodes.PointerType): |
| 222 | 200 if expr.a.typ is intType: |
| 201 return ar | |
| 202 elif isinstance(expr.a.typ, astnodes.PointerType): | |
| 203 return ar | |
| 204 else: | |
| 205 raise Exception() | |
| 230 | 206 else: |
| 207 raise Exception("not implemented") | |
| 225 | 208 elif type(expr) is astnodes.FunctionCall: |
| 228 | 209 tmp = self.builder.newTmp("res") |
| 210 args = [] | |
| 211 for arg in expr.args: | |
| 212 ar = self.genExprCode(arg) | |
| 213 args.append(ar) | |
| 214 fn = self.funcMap[expr.proc] | |
| 215 ins = ir.Call(fn, args, tmp) | |
| 216 self.builder.addIns(ins) | |
| 217 return tmp | |
| 225 | 218 else: |
| 228 | 219 raise CompilerError('Unknown expr {}'.format(expr)) |
| 157 | 220 |