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GH-93621: reorder code in with/async-with exception exit path to reduce the size of the exception table #93622

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Merged
iritkatriel merged 6 commits into from
Jun 10, 2022
Merged

GH-93621: reorder code in with/async-with exception exit path to reduce the size of the exception table #93622

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acf066c
reorder code in with/async-with exception exit path to reduce the siz…
iritkatriel Jun 8, 2022
4966724
📜🤖 Added by blurb_it.
blurb-it[bot] Jun 9, 2022
dc96fbe
add direct dis tests for with and async-with
iritkatriel Jun 9, 2022
946a191
add some checks for the exception table in dis output
iritkatriel Jun 9, 2022
61729a3
Merge remote-tracking branch 'upstream/main' into with-exception
iritkatriel Jun 9, 2022
38b21f1
update tests after merge
iritkatriel Jun 9, 2022
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reorder code in with/async-with exception exit path to reduce the siz… 
…e of the exception table
  • Loading branch information
@iritkatriel
iritkatriel committed Jun 8, 2022
commit acf066c3a0202f8bada87e03a56a01047d6ab79e
16 changes: 8 additions & 8 deletions Lib/test/test_dis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1471,16 +1471,16 @@ def _prepare_test_cases():
Instruction(opname='RETURN_VALUE', opcode=83, arg=None, argval=None, argrepr='', offset=302, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='PUSH_EXC_INFO', opcode=35, arg=None, argval=None, argrepr='', offset=304, starts_line=25, is_jump_target=False, positions=None),
Instruction(opname='WITH_EXCEPT_START', opcode=49, arg=None, argval=None, argrepr='', offset=306, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_JUMP_FORWARD_IF_TRUE', opcode=115, arg=4, argval=318, argrepr='to 318', offset=308, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_JUMP_FORWARD_IF_TRUE', opcode=115, arg=1, argval=312, argrepr='to 312', offset=308, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='RERAISE', opcode=119, arg=2, argval=2, argrepr='', offset=310, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='COPY', opcode=120, arg=3, argval=3, argrepr='', offset=312, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_TOP', opcode=1, arg=None, argval=None, argrepr='', offset=312, starts_line=None, is_jump_target=True, positions=None),
Instruction(opname='POP_EXCEPT', opcode=89, arg=None, argval=None, argrepr='', offset=314, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='RERAISE', opcode=119, arg=1, argval=1, argrepr='', offset=316, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_TOP', opcode=1, arg=None, argval=None, argrepr='', offset=318, starts_line=None, is_jump_target=True, positions=None),
Instruction(opname='POP_EXCEPT', opcode=89, arg=None, argval=None, argrepr='', offset=320, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_TOP', opcode=1, arg=None, argval=None, argrepr='', offset=322, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_TOP', opcode=1, arg=None, argval=None, argrepr='', offset=324, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='JUMP_BACKWARD', opcode=140, arg=27, argval=274, argrepr='to 274', offset=326, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_TOP', opcode=1, arg=None, argval=None, argrepr='', offset=316, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_TOP', opcode=1, arg=None, argval=None, argrepr='', offset=318, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='JUMP_BACKWARD', opcode=140, arg=24, argval=274, argrepr='to 274', offset=320, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='COPY', opcode=120, arg=3, argval=3, argrepr='', offset=322, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='POP_EXCEPT', opcode=89, arg=None, argval=None, argrepr='', offset=324, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='RERAISE', opcode=119, arg=1, argval=1, argrepr='', offset=326, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='PUSH_EXC_INFO', opcode=35, arg=None, argval=None, argrepr='', offset=328, starts_line=None, is_jump_target=False, positions=None),
Instruction(opname='LOAD_GLOBAL', opcode=116, arg=4, argval='ZeroDivisionError', argrepr='ZeroDivisionError', offset=330, starts_line=22, is_jump_target=False, positions=None),
Instruction(opname='CHECK_EXC_MATCH', opcode=36, arg=None, argval=None, argrepr='', offset=342, starts_line=None, is_jump_target=False, positions=None),
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20 changes: 13 additions & 7 deletions Python/compile.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5551,20 +5551,26 @@ compiler_visit_keyword(struct compiler *c, keyword_ty k)
static int
compiler_with_except_finish(struct compiler *c, basicblock * cleanup) {
UNSET_LOC(c);
basicblock *exit;
exit = compiler_new_block(c);
if (exit == NULL)
basicblock *suppress = compiler_new_block(c);
if (suppress == NULL) {
return 0;
ADDOP_JUMP(c, POP_JUMP_IF_TRUE, exit);
}
ADDOP_JUMP(c, POP_JUMP_IF_TRUE, suppress);
ADDOP_I(c, RERAISE, 2);
compiler_use_next_block(c, cleanup);
POP_EXCEPT_AND_RERAISE(c);
compiler_use_next_block(c, exit);
compiler_use_next_block(c, suppress);
ADDOP(c, POP_TOP); /* exc_value */
ADDOP(c, POP_BLOCK);
ADDOP(c, POP_EXCEPT);
ADDOP(c, POP_TOP);
ADDOP(c, POP_TOP);
basicblock *exit = compiler_new_block(c);
if (exit == NULL) {
return 0;
}
ADDOP_JUMP(c, JUMP, exit);
compiler_use_next_block(c, cleanup);
POP_EXCEPT_AND_RERAISE(c);
compiler_use_next_block(c, exit);
return 1;
}

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