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annotate python/ppci/objectfile.py @ 409:8fe299cd2d55 devel
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| author | Windel Bouwman |
|---|---|
| date | Sat, 21 Feb 2015 12:20:10 +0100 |
| parents | 86b02c98a717 |
| children | 9667d78ba79e |
| rev | line source |
|---|---|
| 334 | 1 |
| 2 """ | |
| 3 Object files are used to store assembled code. Information contained | |
| 4 is code, symbol table and relocation information. | |
| 5 """ | |
| 6 | |
|
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7 from . import CompilerError |
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8 |
| 334 | 9 class Symbol: |
| 335 | 10 def __init__(self, name, value, section): |
| 334 | 11 self.name = name |
| 12 self.value = value | |
| 335 | 13 self.section = section |
| 14 | |
| 15 def __repr__(self): | |
| 16 return 'SYM {}, val={} sec={}'.format(self.name, self.value, self.section) | |
| 334 | 17 |
| 18 | |
| 19 class Relocation: | |
| 342 | 20 """ Represents a relocation entry. A relocation always has a symbol to refer to |
| 21 and a relocation type """ | |
| 335 | 22 def __init__(self, sym, offset, typ, section): |
| 23 self.sym = sym | |
| 24 self.offset = offset | |
| 25 self.typ = typ | |
| 26 self.section = section | |
| 27 | |
| 28 def __repr__(self): | |
| 29 return 'RELOC {} off={} t={} sec={}'.format(self.sym, self.offset, self.typ, self.section) | |
| 334 | 30 |
| 31 | |
| 32 class Section: | |
| 33 def __init__(self, name): | |
| 34 self.name = name | |
| 335 | 35 self.address = 0 |
| 36 self.data = bytearray() | |
| 37 | |
| 38 def add_data(self, data): | |
| 39 self.data += data | |
| 40 | |
| 41 @property | |
| 42 def Size(self): | |
| 43 return len(self.data) | |
| 44 | |
| 45 def __repr__(self): | |
| 46 return 'SECTION {}'.format(self.name) | |
| 334 | 47 |
| 48 | |
| 49 class ObjectFile: | |
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parents:
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50 """ Container for sections with compiled code or data. |
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changeset
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51 Also contains symbols and relocation entries """ |
| 334 | 52 def __init__(self): |
| 53 self.symbols = {} | |
| 54 self.sections = {} | |
| 55 self.relocations = [] | |
| 56 | |
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parents:
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changeset
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57 def find_symbol(self, name): |
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58 return self.symbols[name] |
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d1ecc493384e
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parents:
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diff
changeset
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59 |
| 335 | 60 def add_symbol(self, name, value, section): |
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Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
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61 if name in self.symbols: |
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d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
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62 raise CompilerError('{} already defined'.format(name)) |
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d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
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63 assert section in self.sections |
| 335 | 64 sym = Symbol(name, value, section) |
| 334 | 65 self.symbols[name] = sym |
| 66 return sym | |
| 335 | 67 |
| 68 def add_relocation(self, sym_name, offset, typ, section): | |
| 342 | 69 assert type(sym_name) is str, str(sym_name) |
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d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
70 assert section in self.sections |
| 335 | 71 reloc = Relocation(sym_name, offset, typ, section) |
| 72 self.relocations.append(reloc) | |
| 73 return reloc | |
| 74 | |
| 75 def get_section(self, name): | |
| 76 if not name in self.sections: | |
| 77 self.sections[name] = Section(name) | |
| 78 return self.sections[name] |