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208
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1 import binascii
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249
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2 from target import Instruction, Label, DebugInfo
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234
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3
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208
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4 """
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5 The output stream is a stream of instructions that can be output
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6 to a file or binary or hexfile.
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7 """
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8
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219
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9
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237
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10 class Section:
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11 def __init__(self):
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250
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12 self.address = 0
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237
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13 self.instructions = []
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14
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15 def emit(self, item):
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16 assert isinstance(item, Instruction)
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17 self.instructions.append(item)
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18
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19 def to_bytes(self):
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20 d = bytearray()
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21 for i in self.instructions:
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22 addr = i.address
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23 insword = i.encode()
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24 assert type(insword) is bytes
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25 d.extend(insword)
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26 return bytes(d)
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27
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249
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28 def debugInfos(self):
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29 di = [i for i in self.instructions if isinstance(i, DebugInfo)]
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30 return di
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31
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208
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32 class OutputStream:
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33 def __init__(self):
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34 self.sections = {}
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35 self.currentSection = None
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225
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36
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208
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37 def emit(self, item):
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237
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38 assert self.currentSection
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250
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39 self.currentSection.emit(item)
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219
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40
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250
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41 def selectSection(self, sname):
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42 self.currentSection = self.getSection(sname)
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208
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43
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235
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44 def getLabelAddress(self, lname):
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45 assert isinstance(lname, str)
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234
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46 for s in self.sections.values():
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237
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47 for i in s.instructions:
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234
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48 if type(i) is Label:
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235
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49 if i.name == lname:
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234
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50 return i.address
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51 return 0
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52
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249
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53 def getSection(self, name):
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54 if not name in self.sections:
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55 self.sections[name] = Section()
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56 return self.sections[name]
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57
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208
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58 def backpatch(self):
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59 """ Fixup references to other parts in the assembler """
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250
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60 for s in self.sections.values():
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61 address = s.address
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62 for i in s.instructions:
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208
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63 i.address = address
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234
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64 i.resolve(self.getLabelAddress)
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208
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65 bts = i.encode()
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66 address += len(bts)
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67
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68 def dump(self):
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69 self.backpatch()
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236
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70 self.backpatch()
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208
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71 for s in sorted(self.sections.keys()):
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72 self.dumpSection(s)
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73
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74 def dumpSection(self, s):
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237
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75 print('.section '+ s)
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76 for i in self.sections[s].instructions:
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234
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77 addr = i.address
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78 insword = i.encode()
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79 assert type(insword) is bytes
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80 insword = binascii.hexlify(bytes(reversed(insword))).decode('ascii')
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81 asm = str(i)
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235
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82 if len(insword) == 0:
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83 print(' {}'.format(asm))
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84 else:
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85 print(' 0x{0:08x} 0x{1} {2}'.format(addr, insword, asm))
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208
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86
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87 class TextOutputStream(OutputStream):
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88 pass
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89
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90 class BinOutputStream(OutputStream):
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91
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236
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92 @property
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93 def Data(self):
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94 d = self.dump()
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95 return bytes(d)
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96
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97 def dump(self):
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98 self.backpatch()
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99 self.backpatch()
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237
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100 section = self.sections[list(self.sections.keys())[0]]
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101 return section.to_bytes()
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236
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102
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103
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