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fhdl/tracer: Import Python 3.5/3.6 version guards from Migen.

This commit is contained in:
William D. Jones 2017-12-29 19:56:52 -05:00
parent 5d98a60e6e
commit ff0ad9a622
1 changed files with 29 additions and 8 deletions
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37
litex/gen/fhdl/tracer.py
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@ -1,15 +1,40 @@
import inspect
from sys import version_info
from opcode import opname
from collections import defaultdict
# All opcodes are 2 bytes in length in Python 3.6
def _bytecode_length_version_guard(old_len):
return old_len if version_info[1] < 6 else 2
_call_opcodes = {
"CALL_FUNCTION" : _bytecode_length_version_guard(3),
"CALL_FUNCTION_KW" : _bytecode_length_version_guard(3),
}
if version_info[1] < 6:
_call_opcodes["CALL_FUNCTION_VAR"] = 3
_call_opcodes["CALL_FUNCTION_VAR_KW"] = 3
else:
_call_opcodes["CALL_FUNCTION_VAR_KW"] = 2
_load_build_opcodes = {
"LOAD_GLOBAL" : _bytecode_length_version_guard(3),
"LOAD_ATTR" : _bytecode_length_version_guard(3),
"LOAD_FAST" : _bytecode_length_version_guard(3),
"LOAD_DEREF" : _bytecode_length_version_guard(3),
"DUP_TOP" : _bytecode_length_version_guard(1),
"BUILD_LIST" : _bytecode_length_version_guard(3),
}
def get_var_name(frame):
code = frame.f_code
call_index = frame.f_lasti
call_opc = opname[code.co_code[call_index]]
if call_opc != "CALL_FUNCTION" and call_opc != "CALL_FUNCTION_VAR":
if call_opc not in _call_opcodes:
return None
index = call_index+3
index = call_index+_call_opcodes[call_opc]
while True:
opc = opname[code.co_code[index]]
if opc == "STORE_NAME" or opc == "STORE_ATTR":
@ -21,12 +46,8 @@ def get_var_name(frame):
elif opc == "STORE_DEREF":
name_index = int(code.co_code[index+1])
return code.co_cellvars[name_index]
elif opc == "LOAD_GLOBAL" or opc == "LOAD_ATTR" or opc == "LOAD_FAST" or opc == "LOAD_DEREF":
index += 3
elif opc == "DUP_TOP":
index += 1
elif opc == "BUILD_LIST":
index += 3
elif opc in _load_build_opcodes:
index += _load_build_opcodes[opc]
else:
return None