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155
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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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175
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10 self.funcMap = {}
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171
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11 self.builder = ir.Builder()
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12 m = ir.Module(pkg.name)
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13 self.builder.setModule(m)
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170
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14 self.genModule(pkg)
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171
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15 return m
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170
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16
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17 # inner helpers:
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18 def genModule(self, pkg):
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175
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19 # Take care of forward declarations:
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20 for s in pkg.scope:
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21 if type(s) is astnodes.Function:
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22 f = self.builder.newFunc(s.name)
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23 self.funcMap[s] = f
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170
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24 for s in pkg.scope:
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25 if type(s) is astnodes.Variable:
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26 # TODO
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27 pass
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28 elif type(s) is astnodes.Function:
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29 # TODO: handle arguments
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175
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30 f = self.funcMap[s]
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172
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31 self.builder.setFunc(f)
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32 bb = self.builder.newBB()
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33 f.entry = bb
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34 self.builder.setBB(bb)
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174
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35 # generate room for locals:
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36
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37 for sym in s.scope:
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175
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38 #print(sym, sym.isParameter)
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39 # TODO: handle parameters different
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174
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40 v = self.builder.newTmp(sym.name)
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41 self.builder.addIns(ir.Alloc(v))
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42 self.varMap[sym] = v
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43
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170
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44 self.genCode(s.body)
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172
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45 # TODO handle return?
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46 self.builder.addIns(ir.Return())
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172
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47 self.builder.setFunc(None)
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48 else:
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49 print(s)
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158
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50
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170
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51 def genCode(self, code):
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52 if type(code) is astnodes.CompoundStatement:
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53 for s in code.statements:
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54 self.genCode(s)
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55 elif type(code) is astnodes.Assignment:
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56 re = self.genExprCode(code.rval)
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174
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57 loc = self.varMap[code.lval.target]
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58 self.builder.addIns(ir.Store(loc, re))
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170
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59 elif type(code) is astnodes.IfStatement:
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171
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60 bbtrue = self.builder.newBB()
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61 bbfalse = self.builder.newBB()
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62 te = self.builder.newBB()
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63 self.genCondCode(code.condition, bbtrue, bbfalse)
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64 self.builder.setBB(bbtrue)
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170
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65 self.genCode(code.truestatement)
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66 self.builder.addIns(ir.Branch(te))
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67 self.builder.setBB(bbfalse)
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68 self.genCode(code.falsestatement)
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69 self.builder.addIns(ir.Branch(te))
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70 self.builder.setBB(te)
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170
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71 elif type(code) is astnodes.FunctionCall:
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176
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72 print('TODO')
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170
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73 pass
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74 elif type(code) is astnodes.EmptyStatement:
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75 pass
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76 elif type(code) is astnodes.ReturnStatement:
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174
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77 if code.expr:
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78 re = self.genExprCode(code.expr)
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79 self.builder.addIns(ir.Return(re))
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80 else:
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81 self.builder.addIns(ir.Return())
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176
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82 elif type(code) is astnodes.WhileStatement:
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83 bbdo = self.builder.newBB()
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84 bbtest = self.builder.newBB()
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85 te = self.builder.newBB()
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86 self.builder.addIns(ir.Branch(bbtest))
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87 self.builder.setBB(bbtest)
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88 self.genCondCode(code.condition, bbdo, te)
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89 self.builder.setBB(bbdo)
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90 self.genCode(code.dostatement)
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91 self.builder.addIns(ir.Branch(bbtest))
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92 self.builder.setBB(te)
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170
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93 else:
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94 print('Unknown stmt:', code)
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171
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95 def genCondCode(self, expr, bbtrue, bbfalse):
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96 # Implement sequential logical operators
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97 assert expr.typ == boolType
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98 if type(expr) is astnodes.Binop:
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99 if expr.op == 'or':
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100 l2 = self.builder.newBB()
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101 self.genCondCode(expr.a, bbtrue, l2)
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102 self.builder.setBB(l2)
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103 self.genCondCode(expr.b, bbtrue, bbfalse)
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104 elif expr.op == 'and':
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105 l2 = self.builder.newBB()
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106 self.genCondCode(expr.a, l2, bbfalse)
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107 self.builder.setBB(l2)
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108 self.genCondCode(expr.b, bbtrue, bbfalse)
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109 elif expr.op in ['==', '>', '<']:
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110 ta = self.genExprCode(expr.a)
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111 tb = self.genExprCode(expr.b)
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112 i = ir.ConditionalBranch(ta, expr.op, tb, bbtrue, bbfalse)
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113 self.builder.addIns(i)
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114 else:
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174
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115 raise NotImlementedError('Unknown condition {0}'.format(expr))
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171
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116 elif type(expr) is astnodes.Literal:
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117 if expr.val:
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118 self.builder.addIns(ir.BranchInstruction(bbtrue))
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119 else:
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120 self.builder.addIns(ir.BranchInstruction(bbfalse))
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121 else:
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122 print('Unknown cond', expr)
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170
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123 def genExprCode(self, expr):
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124 if type(expr) is astnodes.Binop:
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125 ra = self.genExprCode(expr.a)
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126 rb = self.genExprCode(expr.b)
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127 tmp = self.builder.newTmp()
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128 ops = ['+', '-', '*', '/', 'and', 'or']
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129 if expr.op in ops:
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130 op = expr.op
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131 ins = ir.BinaryOperator(tmp, op, ra, rb)
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132 self.builder.addIns(ins)
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133 return tmp
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134 else:
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135 print('Unknown {0}'.format(expr))
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136 # TODO
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137 return tmp
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170
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138 elif type(expr) is astnodes.Constant:
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139 tmp = self.builder.newTmp()
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140 # TODO
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141 return tmp
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170
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142 elif type(expr) is astnodes.VariableUse:
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171
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143 tmp = self.builder.newTmp()
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144 loc = self.varMap[expr.target]
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145 i = ir.Load(loc, tmp)
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171
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146 self.builder.addIns(i)
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147 return tmp
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170
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148 elif type(expr) is astnodes.Literal:
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171
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149 tmp = self.builder.newTmp()
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150 ins = ir.ImmLoad(tmp, expr.val)
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151 self.builder.addIns(ins)
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158
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152 return tmp
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175
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153 elif type(expr) is astnodes.FunctionCall:
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154 tmp = self.builder.newTmp("res")
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155 args = []
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156 for arg in expr.args:
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157 ar = self.genExprCode(arg)
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158 args.append(ar)
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159 fn = self.funcMap[expr.proc]
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160 ins = ir.Call(fn, args, tmp)
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161 self.builder.addIns(ins)
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162 return tmp
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157
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163 else:
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170
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164 print('Unknown expr:', code)
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157
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165
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