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346
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1 from ... import ir, same_dir
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2 from ppci.irmach import AbstractInstruction as makeIns
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3 from ppci.ir2tree import makeTree
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4 from .instructions import Str1, Mov2
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352
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5 from .instructions import B, Bl, Blt, Bgt, Beq, Bne, Cmp2
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346
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6 import pyburg
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7 from ..basetarget import Nop
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8 from ..instructionselector import InstructionSelector
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9
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10 # Import BURG spec for arm:
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11 spec_file = same_dir(__file__, 'arm.brg')
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12 arm_matcher = pyburg.load_as_module(spec_file)
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13
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14
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15 class ArmMatcher(arm_matcher.Matcher):
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16 """ Matcher that derives from a burg spec generated matcher """
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17 def __init__(self, selector):
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18 super().__init__()
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19 self.newTmp = selector.newTmp
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20 self.emit = selector.emit
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21 self.selector = selector
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22
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23
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24 class ArmInstructionSelector(InstructionSelector):
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25 """ Instruction selector for the arm architecture """
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26 def __init__(self):
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27 super().__init__()
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28 self.matcher = ArmMatcher(self)
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29
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30 def munchExpr(self, e):
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31 # Use BURG system here:
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32 t = makeTree(e)
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33 return self.matcher.gen(t)
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34
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35 def munchCall(self, e):
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36 """ Generate code for call sequence """
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37 # Move arguments into proper locations:
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38 reguses = []
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39 for i, a in enumerate(e.arguments):
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40 loc = self.frame.argLoc(i)
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41 m = ir.Move(loc, a)
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42 self.munchStm(m)
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43 if isinstance(loc, ir.Temp):
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44 reguses.append(loc)
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45 self.emit(Bl(e.f), src=reguses, dst=[self.frame.rv])
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46 d = self.newTmp()
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47 self.move(d, self.frame.rv)
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48 return d
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49
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50 def munchStm(self, s):
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51 if isinstance(s, ir.Terminator):
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52 pass
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53 elif isinstance(s, ir.Move) and isinstance(s.dst, ir.Mem) and \
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54 isinstance(s.dst.e, ir.Binop) and s.dst.e.operation == '+' and \
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55 isinstance(s.dst.e.b, ir.Const):
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56 a = self.munchExpr(s.dst.e.a)
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57 val = self.munchExpr(s.src)
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58 c = s.dst.e.b.value
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59 self.emit(Str1, others=[c], src=[a, val])
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60 elif isinstance(s, ir.Move) and isinstance(s.dst, ir.Mem):
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61 memloc = self.munchExpr(s.dst.e)
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62 val = self.munchExpr(s.src)
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63 self.emit(Str1, others=[0], src=[memloc, val])
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64 elif isinstance(s, ir.Move) and isinstance(s.dst, ir.Temp):
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65 val = self.munchExpr(s.src)
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66 dreg = s.dst
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67 self.move(dreg, val)
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68 elif isinstance(s, ir.Exp):
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69 # Generate expression code and discard the result.
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70 x = self.munchExpr(s.e)
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71 self.emit(Nop(), src=[x])
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72 elif isinstance(s, ir.Jump):
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73 tgt = self.targets[s.target]
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74 self.emit(B(ir.label_name(s.target)), jumps=[tgt])
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75 elif isinstance(s, ir.CJump):
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76 a = self.munchExpr(s.a)
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77 b = self.munchExpr(s.b)
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352
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78 self.emit(Cmp2, src=[a, b])
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79 ntgt = self.targets[s.lab_no]
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80 ytgt = self.targets[s.lab_yes]
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81 jmp_ins = makeIns(B(ir.label_name(s.lab_no)), jumps=[ntgt])
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82 opnames = {'<': Blt, '>':Bgt, '==':Beq, '!=':Bne}
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83 op = opnames[s.cond](ir.label_name(s.lab_yes))
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84 self.emit(op, jumps=[ytgt, jmp_ins]) # Explicitely add fallthrough
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85 self.emit2(jmp_ins)
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86 else:
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87 raise NotImplementedError('Stmt --> {}'.format(s))
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88
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89 def move(self, dst, src):
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90 self.emit(Mov2, src=[src], dst=[dst], ismove=True)
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