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migen/fhdl/tracer.py: update get_var_name() from amaranth #283

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migen/fhdl/tracer.py: update get_var_name() from amaranth #283

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76 changes: 31 additions & 45 deletions migen/fhdl/tracer.py
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Original file line number Diff line number Diff line change
@@ -1,39 +1,9 @@
import inspect
import sys
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
elif version_info[1] < 7:
_call_opcodes["CALL_FUNCTION_EX"] = 2
else:
_call_opcodes["CALL_FUNCTION_EX"] = 2
_call_opcodes["CALL_METHOD"] = 2
_call_opcodes["CALL"] = 2

_load_build_opcodes = {
"LOAD_GLOBAL" : _bytecode_length_version_guard(3),
"LOAD_NAME" : _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),
"CACHE" : _bytecode_length_version_guard(3),
"COPY" : _bytecode_length_version_guard(3),
}


def get_var_name(frame):
code = frame.f_code
Expand All @@ -42,28 +12,44 @@ def get_var_name(frame):
call_index -= 2
while True:
call_opc = opname[code.co_code[call_index]]
if call_opc in("EXTENDED_ARG",):
if call_opc in ("EXTENDED_ARG",):
call_index += 2
else:
break
if call_opc not in _call_opcodes:
if call_opc not in ("CALL_FUNCTION", "CALL_FUNCTION_KW", "CALL_FUNCTION_EX",
"CALL_METHOD", "CALL", "CALL_KW"):
return None
index = call_index+_call_opcodes[call_opc]

index = call_index + 2
imm = 0
while True:
opc = opname[code.co_code[index]]
if opc == "STORE_NAME" or opc == "STORE_ATTR":
name_index = int(code.co_code[index+1])
return code.co_names[name_index]
if opc == 'EXTENDED_ARG':
imm |= int(code.co_code[index + 1])
imm <<= 8
index += 2
elif opc in ("STORE_NAME", "STORE_ATTR"):
imm |= int(code.co_code[index + 1])
return code.co_names[imm]
elif opc == "STORE_FAST":
name_index = int(code.co_code[index+1])
return code.co_varnames[name_index]
imm |= int(code.co_code[index + 1])
if sys.version_info >= (3, 11):
return code._varname_from_oparg(imm)
else:
return code.co_varnames[imm]
elif opc == "STORE_DEREF":
name_index = int(code.co_code[index+1])
if version_info >= (3, 11):
name_index -= code.co_nlocals
return code.co_cellvars[name_index]
elif opc in _load_build_opcodes:
index += _load_build_opcodes[opc]
imm |= int(code.co_code[index + 1])
if sys.version_info >= (3, 11):
return code._varname_from_oparg(imm)
else:
if imm < len(code.co_cellvars):
return code.co_cellvars[imm]
else:
return code.co_freevars[imm - len(code.co_cellvars)]
elif opc in ("LOAD_GLOBAL", "LOAD_NAME", "LOAD_ATTR", "LOAD_FAST", "LOAD_DEREF",
"DUP_TOP", "BUILD_LIST", "CACHE", "COPY"):
imm = 0
index += 2
else:
return None

Expand Down