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tracer: use sys._getframe directly.

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This speeds up elaboration by ~30-40%.
This commit is contained in:
whitequark 2019-08-08 10:23:35 +00:00
parent e6b1e3de1a
commit 4ee82c9584
1 changed files with 4 additions and 10 deletions
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14
nmigen/tracer.py
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@ -1,5 +1,4 @@
import traceback
import inspect
import sys
from opcode import opname
@ -14,10 +13,7 @@ _raise_exception = object()
def get_var_name(depth=2, default=_raise_exception):
frame = inspect.currentframe()
for _ in range(depth):
frame = frame.f_back
frame = sys._getframe(depth)
code = frame.f_code
call_index = frame.f_lasti
while True:
@ -55,7 +51,5 @@ def get_src_loc(src_loc_at=0):
# n-th frame: get_src_loc()
# n-1th frame: caller of get_src_loc() (usually constructor)
# n-2th frame: caller of caller (usually user code)
# Python returns the stack frames reversed, so it is enough to set limit and grab the very
# first one in the array.
tb = traceback.extract_stack(limit=3 + src_loc_at)
return (tb[0].filename, tb[0].lineno)
frame = sys._getframe(2 + src_loc_at)
return (frame.f_code.co_filename, frame.f_lineno)