Mercurial > lcfOS
annotate python/ppci/objectfile.py @ 336:d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
| author | Windel Bouwman |
|---|---|
| date | Wed, 19 Feb 2014 22:32:15 +0100 |
| parents | 582a1aaa3983 |
| children | 86b02c98a717 |
| 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 | |
|
336
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
7 from . import CompilerError |
|
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
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: | |
| 335 | 20 def __init__(self, sym, offset, typ, section): |
| 21 self.sym = sym | |
| 22 self.offset = offset | |
| 23 self.typ = typ | |
| 24 self.section = section | |
| 25 | |
| 26 def __repr__(self): | |
| 27 return 'RELOC {} off={} t={} sec={}'.format(self.sym, self.offset, self.typ, self.section) | |
| 334 | 28 |
| 29 | |
| 30 class Section: | |
| 31 def __init__(self, name): | |
| 32 self.name = name | |
| 335 | 33 self.address = 0 |
| 34 self.data = bytearray() | |
| 35 | |
| 36 def add_data(self, data): | |
| 37 self.data += data | |
| 38 | |
| 39 @property | |
| 40 def Size(self): | |
| 41 return len(self.data) | |
| 42 | |
| 43 def __repr__(self): | |
| 44 return 'SECTION {}'.format(self.name) | |
| 334 | 45 |
| 46 | |
| 47 class ObjectFile: | |
|
336
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
48 """ Container for sections with compiled code or data. |
|
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
49 Also contains symbols and relocation entries """ |
| 334 | 50 def __init__(self): |
| 51 self.symbols = {} | |
| 52 self.sections = {} | |
| 53 self.relocations = [] | |
| 54 | |
|
336
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
55 def find_symbol(self, 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
|
56 return self.symbols[name] |
|
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
57 |
| 335 | 58 def add_symbol(self, name, value, section): |
|
336
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
59 if name in self.symbols: |
|
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
60 raise CompilerError('{} already defined'.format(name)) |
|
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
61 assert section in self.sections |
| 335 | 62 sym = Symbol(name, value, section) |
| 334 | 63 self.symbols[name] = sym |
| 64 return sym | |
| 335 | 65 |
| 66 def add_relocation(self, sym_name, offset, typ, section): | |
|
336
d1ecc493384e
Added spiffy armtoken class for bit fiddeling. Added cool test that checks for build repeatability
Windel Bouwman
parents:
335
diff
changeset
|
67 assert section in self.sections |
| 335 | 68 reloc = Relocation(sym_name, offset, typ, section) |
| 69 self.relocations.append(reloc) | |
| 70 return reloc | |
| 71 | |
| 72 def get_section(self, name): | |
| 73 if not name in self.sections: | |
| 74 self.sections[name] = Section(name) | |
| 75 return self.sections[name] |