annotate python/ppci/objectfile.py @ 357:818be710e13d

Added acceptance function to burg
author Windel Bouwman
date Fri, 14 Mar 2014 15:14:29 +0100
parents 86b02c98a717
children 9667d78ba79e
rev   line source
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2 """
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3 Object files are used to store assembled code. Information contained
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4 is code, symbol table and relocation information.
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5 """
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7 from . import CompilerError
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8
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9 class Symbol:
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10 def __init__(self, name, value, section):
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11 self.name = name
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12 self.value = value
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13 self.section = section
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14
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15 def __repr__(self):
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16 return 'SYM {}, val={} sec={}'.format(self.name, self.value, self.section)
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19 class Relocation:
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20 """ Represents a relocation entry. A relocation always has a symbol to refer to
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21 and a relocation type """
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22 def __init__(self, sym, offset, typ, section):
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23 self.sym = sym
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24 self.offset = offset
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25 self.typ = typ
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26 self.section = section
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27
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28 def __repr__(self):
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29 return 'RELOC {} off={} t={} sec={}'.format(self.sym, self.offset, self.typ, self.section)
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32 class Section:
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33 def __init__(self, name):
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34 self.name = name
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35 self.address = 0
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36 self.data = bytearray()
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37
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38 def add_data(self, data):
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39 self.data += data
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40
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41 @property
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42 def Size(self):
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43 return len(self.data)
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44
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45 def __repr__(self):
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46 return 'SECTION {}'.format(self.name)
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49 class ObjectFile:
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50 """ Container for sections with compiled code or data.
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51 Also contains symbols and relocation entries """
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52 def __init__(self):
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53 self.symbols = {}
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54 self.sections = {}
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55 self.relocations = []
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56
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57 def find_symbol(self, name):
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58 return self.symbols[name]
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59
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60 def add_symbol(self, name, value, section):
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61 if name in self.symbols:
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62 raise CompilerError('{} already defined'.format(name))
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63 assert section in self.sections
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64 sym = Symbol(name, value, section)
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65 self.symbols[name] = sym
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66 return sym
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68 def add_relocation(self, sym_name, offset, typ, section):
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69 assert type(sym_name) is str, str(sym_name)
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70 assert section in self.sections
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71 reloc = Relocation(sym_name, offset, typ, section)
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72 self.relocations.append(reloc)
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73 return reloc
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74
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75 def get_section(self, name):
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76 if not name in self.sections:
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77 self.sections[name] = Section(name)
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78 return self.sections[name]