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208
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1 import binascii
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346
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2 from ppci.target import Instruction, Alignment
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335
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3 from ppci.objectfile import ObjectFile
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234
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4
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208
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5 """
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6 The output stream is a stream of instructions that can be output
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7 to a file or binary or hexfile.
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8 """
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9
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219
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10
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335
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11 class OutputStream:
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237
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12 def emit(self, item):
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335
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13 raise NotImplementedError('Abstract base class')
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219
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14
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250
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15 def selectSection(self, sname):
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335
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16 raise NotImplementedError('Abstract base class')
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234
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17
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208
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18
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316
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19 class OutputStreamWriter:
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20 def __init__(self, extra_indent=''):
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21 self.extra_indent = extra_indent
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208
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22
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316
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23 def dump(self, stream, f):
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24 for s in sorted(stream.sections.keys()):
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25 # print('.section '+ s)
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26 self.dumpSection(stream.sections[s], f)
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27
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28 def dumpSection(self, s, f):
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29 for i in s.instructions:
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234
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30 addr = i.address
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31 insword = i.encode()
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32 assert type(insword) is bytes
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33 insword = binascii.hexlify(bytes(reversed(insword))).decode('ascii')
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34 asm = str(i)
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235
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35 if len(insword) == 0:
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316
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36 print(' {}'.format(asm), file=f)
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235
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37 else:
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316
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38 print(' 0x{0:08x} 0x{1} {2}'.format(addr, insword, asm), file=f)
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208
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39
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296
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40
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335
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41 class BinaryOutputStream(OutputStream):
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42 """ Output stream that writes to object file """
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43 def __init__(self, obj_file):
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44 super().__init__()
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45 self.obj_file = obj_file
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208
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46
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335
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47 def emit(self, item):
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48 """ Encode instruction and add symbol and relocation information """
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341
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49 assert isinstance(item, Instruction), str(item) + str(type(item))
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335
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50 assert self.currentSection
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51 section = self.currentSection
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52 address = self.currentSection.Size
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53 b = item.encode()
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54 syms = item.symbols()
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55 relocs = item.relocations()
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56 section.add_data(b)
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57 for sym in syms:
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58 self.obj_file.add_symbol(sym, address, section.name)
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59 for sym, typ in relocs:
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60 self.obj_file.add_relocation(sym, address, typ, section.name)
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61 # Special case for align, TODO do this different?
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62 if type(item) is Alignment:
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63 while section.Size % item.align != 0:
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64 section.add_data(bytes([0]))
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236
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65
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335
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66 def selectSection(self, sname):
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67 self.currentSection = self.obj_file.get_section(sname)
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337
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68
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69
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70 class DummyOutputStream(OutputStream):
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71 def emit(self, item):
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72 pass
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73
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74 def selectSection(self, sname):
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75 pass
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