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Simplify handling of 32-bit and 64-bit encodings

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This commit is contained in:
Alexis Engelke
2019-02-23 12:06:04 +01:00
parent 50ba38627b
commit 10e7a41972
1 changed files with 14 additions and 16 deletions
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30
parseinstrs.py
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@@ -115,6 +115,8 @@ class InstrDesc(namedtuple("InstrDesc", "mnemonic,flags,encoding")):
if "IMM_8" in desc[6:]: flags.imm_byte = 1
return cls(desc[5], frozenset(desc[6:]), flags._encode())
def encode(self, mnemonics_lut):
return struct.pack("<HL", mnemonics_lut[self.mnemonic], self.encoding)
class EntryKind(Enum):
NONE = 0
@@ -215,8 +217,7 @@ class Table:
data += b"\0" * (offsets[name] - len(data))
assert len(data) == offsets[name]
if kind == EntryKind.INSTR:
mnemonicIdx = mnemonics_lut[value[0]]
data += struct.pack("<HL", mnemonicIdx, value[1])
data += value
else: # Table
# count = sum(1 for x in value if x is not None)
# print("Table of kind", kind, "with %d/%d entries"%(count, kind.table_length))
@@ -234,7 +235,7 @@ class Table:
def deduplicate(self):
# Make values hashable
for n, (k, v) in self.data.items():
self.data[n] = k, tuple(v)
self.data[n] = k, (v if k == EntryKind.INSTR else tuple(v))
synonyms = True
while synonyms:
entries = {} # Mapping from entry to name
@@ -250,7 +251,7 @@ class Table:
for key in synonyms:
del self.data[key]
def add_opcode(self, opcode, instrData, root_idx=0):
def add_opcode(self, opcode, instr_encoding, root_idx=0):
opcode = list(opcode) + [(None, None)]
opcode = [(opcode[i+1][0], opcode[i][1]) for i in range(len(opcode)-1)]
@@ -268,9 +269,9 @@ class Table:
# An opcode can occur once only.
assert table[1][opcode[-1][1]] is None
name += "{:02x}/{}".format(opcode[-1][1], instrData[0])
name += "{:02x}/{}".format(opcode[-1][1], "??")
table[1][opcode[-1][1]] = name
self.data[name] = EntryKind.INSTR, instrData
self.data[name] = EntryKind.INSTR, instr_encoding
def wrap(string):
return "\n".join(string[i:i+80] for i in range(0, len(string), 80))
@@ -306,24 +307,21 @@ if __name__ == "__main__":
for opcode in parse_opcode(opcode_string):
entries[opcode].append(InstrDesc.parse(desc))
mnemonics = set()
mnemonics = sorted({desc.mnemonic for descs in entries.values() for desc in descs})
mnemonics_lut = {name: mnemonics.index(name) for name in mnemonics}
table32 = Table()
table64 = Table()
masks = "ONLY64", "ONLY32"
for opcode, descs in entries.items():
for table, ignore_mask in zip((table32, table64), masks):
parsed = [desc for desc in descs if ignore_mask not in desc.flags]
assert len(parsed) <= 1
if parsed:
mnemonics.add(parsed[0].mnemonic)
table.add_opcode(opcode, (parsed[0].mnemonic, parsed[0].encoding))
for desc in descs:
if "ONLY64" not in desc.flags:
table32.add_opcode(opcode, desc.encode(mnemonics_lut))
if "ONLY32" not in desc.flags:
table64.add_opcode(opcode, desc.encode(mnemonics_lut))
table32.deduplicate()
table64.deduplicate()
mnemonics = sorted(mnemonics)
mnemonics_lut = {name: mnemonics.index(name) for name in mnemonics}
mnemonic_tab = [0]
for name in mnemonics:
mnemonic_tab.append(mnemonic_tab[-1] + len(name) + 1)