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1 import ir
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2 from . import astnodes
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171
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3 from .scope import boolType
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4
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170
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5 class CodeGenerator:
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6 """ Generates intermediate code from a package """
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7 def gencode(self, pkg):
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8 assert type(pkg) is astnodes.Package
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174
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9 self.varMap = {} # Maps variables to storage locations.
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171
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10 self.builder = ir.Builder()
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11 m = ir.Module(pkg.name)
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12 self.builder.setModule(m)
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170
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13 self.genModule(pkg)
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14 return m
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170
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15
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16 # inner helpers:
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17 def genModule(self, pkg):
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18 for s in pkg.scope:
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19 if type(s) is astnodes.Variable:
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20 # TODO
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21 pass
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22 elif type(s) is astnodes.Function:
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23 # TODO: handle arguments
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172
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24 f = self.builder.newFunc(s.name)
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25 self.builder.setFunc(f)
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171
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26 bb = self.builder.newBB()
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27 f.entry = bb
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28 self.builder.setBB(bb)
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174
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29 # generate room for locals:
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30
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31 for sym in s.scope:
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32 v = self.builder.newTmp(sym.name)
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33 self.builder.addIns(ir.Alloc(v))
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34 self.varMap[sym] = v
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35
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170
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36 self.genCode(s.body)
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172
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37 # TODO handle return?
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171
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38 self.builder.addIns(ir.Return())
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172
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39 self.builder.setFunc(None)
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40 else:
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41 print(s)
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158
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42
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170
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43 def genCode(self, code):
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44 if type(code) is astnodes.CompoundStatement:
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45 for s in code.statements:
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46 self.genCode(s)
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47 elif type(code) is astnodes.Assignment:
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48 re = self.genExprCode(code.rval)
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174
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49 print(code.lval)
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50 loc = self.varMap[code.lval.target]
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51 self.builder.addIns(ir.Store(loc, re))
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170
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52 elif type(code) is astnodes.IfStatement:
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171
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53 bbtrue = self.builder.newBB()
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54 bbfalse = self.builder.newBB()
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55 te = self.builder.newBB()
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56 self.genCondCode(code.condition, bbtrue, bbfalse)
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57 self.builder.setBB(bbtrue)
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58 self.genCode(code.truestatement)
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59 self.builder.addIns(ir.Branch(te))
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60 self.builder.setBB(bbfalse)
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61 self.genCode(code.falsestatement)
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62 self.builder.addIns(ir.Branch(te))
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63 self.builder.setBB(te)
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64 elif type(code) is astnodes.FunctionCall:
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65 pass
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66 elif type(code) is astnodes.EmptyStatement:
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67 pass
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68 elif type(code) is astnodes.ReturnStatement:
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174
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69 if code.expr:
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70 re = self.genExprCode(code.expr)
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71 self.builder.addIns(ir.Return(re))
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72 else:
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73 self.builder.addIns(ir.Return())
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170
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74 else:
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75 print('Unknown stmt:', code)
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171
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76 def genCondCode(self, expr, bbtrue, bbfalse):
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77 # Implement sequential logical operators
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78 assert expr.typ == boolType
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79 if type(expr) is astnodes.Binop:
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80 if expr.op == 'or':
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81 l2 = self.builder.newBB()
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82 self.genCondCode(expr.a, bbtrue, l2)
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83 self.builder.setBB(l2)
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84 self.genCondCode(expr.b, bbtrue, bbfalse)
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85 elif expr.op == 'and':
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86 l2 = self.builder.newBB()
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87 self.genCondCode(expr.a, l2, bbfalse)
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88 self.builder.setBB(l2)
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89 self.genCondCode(expr.b, bbtrue, bbfalse)
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90 elif expr.op in ['==', '>', '<']:
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91 ta = self.genExprCode(expr.a)
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92 tb = self.genExprCode(expr.b)
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93 i = ir.ConditionalBranch(ta, expr.op, tb, bbtrue, bbfalse)
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94 self.builder.addIns(i)
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95 else:
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174
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96 raise NotImlementedError('Unknown condition {0}'.format(expr))
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171
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97 elif type(expr) is astnodes.Literal:
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98 if expr.val:
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99 self.builder.addIns(ir.BranchInstruction(bbtrue))
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100 else:
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101 self.builder.addIns(ir.BranchInstruction(bbfalse))
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102 else:
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103 print('Unknown cond', expr)
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170
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104 def genExprCode(self, expr):
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105 if type(expr) is astnodes.Binop:
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106 ra = self.genExprCode(expr.a)
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107 rb = self.genExprCode(expr.b)
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171
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108 tmp = self.builder.newTmp()
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170
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109 ops = ['+', '-', '*', '/', 'and', 'or']
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110 if expr.op in ops:
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111 op = expr.op
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112 ins = ir.BinaryOperator(tmp, op, ra, rb)
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113 self.builder.addIns(ins)
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114 return tmp
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115 else:
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116 print('Unknown {0}'.format(expr))
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117 # TODO
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118 return tmp
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170
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119 elif type(expr) is astnodes.Constant:
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171
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120 tmp = self.builder.newTmp()
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121 # TODO
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122 return tmp
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170
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123 elif type(expr) is astnodes.VariableUse:
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171
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124 tmp = self.builder.newTmp()
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125 loc = self.varMap[expr.target]
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126 i = ir.Load(loc, tmp)
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171
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127 self.builder.addIns(i)
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128 return tmp
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170
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129 elif type(expr) is astnodes.Literal:
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130 tmp = self.builder.newTmp()
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131 ins = ir.ImmLoad(tmp, expr.val)
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132 self.builder.addIns(ins)
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158
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133 return tmp
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157
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134 else:
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170
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135 print('Unknown expr:', code)
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157
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136
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