mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 00:48:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

bpo-45711: remove unnecessary DUP_TOP and POP in exception handling (GH-29495)

Browse source
This commit is contained in:
Irit Katriel 2021-11-10 18:08:28 +00:00 • committed by GitHub
parent 05fbd60147
commit 4cdeee5978
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 90 additions and 97 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Python/compile.c
View file

@ -1127,7 +1127,7 @@ stack_effect(int opcode, int oparg, int jump)
case CONTAINS_OP:
return -1;
case JUMP_IF_NOT_EXC_MATCH:
return -2;
return -1;
case IMPORT_NAME:
return -1;
case IMPORT_FROM:
@ -3222,16 +3222,15 @@ compiler_try_finally(struct compiler *c, stmt_ty s)
[] POP_BLOCK
[] JUMP_FORWARD L0
[tb, val, exc] L1: DUP )
[tb, val, exc, exc] <evaluate E1> )
[tb, val, exc, exc, E1] JUMP_IF_NOT_EXC_MATCH L2 ) only if E1
[tb, val, exc] L1: <evaluate E1> )
[tb, val, exc, E1] JUMP_IF_NOT_EXC_MATCH L2 ) only if E1
[tb, val, exc] POP
[tb, val] <assign to V1> (or POP if no V1)
[tb] POP
[] <code for S1>
JUMP_FORWARD L0
[tb, val, exc] L2: DUP
[tb, val, exc] L2: <evaluate E2>
.............................etc.......................
[tb, val, exc] Ln+1: RERAISE # re-raise exception
@ -3281,7 +3280,6 @@ compiler_try_except(struct compiler *c, stmt_ty s)
if (except == NULL)
return 0;
if (handler->v.ExceptHandler.type) {
ADDOP(c, DUP_TOP);
VISIT(c, expr, handler->v.ExceptHandler.type);
ADDOP_JUMP(c, JUMP_IF_NOT_EXC_MATCH, except);
NEXT_BLOCK(c);