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GH-123044: Give the POP_TOP after a case test a location in the body, not the pattern. #130627

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Merged
markshannon merged 10 commits into from
Mar 10, 2025
Merged

GH-123044: Give the POP_TOP after a case test a location in the body, not the pattern. #130627

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fd5d1e7
Use case body location for POP_TOP after case test, to give better lo…
markshannon Feb 27, 2025
1ce7f7f
Add news
markshannon Feb 27, 2025
f98fe7a
Include a default case in test
markshannon Feb 27, 2025
7084af0
Fix copy and paste
markshannon Feb 27, 2025
9332b19
Fix formatting in NEWS file for match cases
markshannon Feb 27, 2025
0d82f1b
Use pseudo location to mark instruction as having the location of the…
markshannon Feb 28, 2025
ab6fa4c
Use -2s for NEXT_LOCATION. Modify basicblock_remove_redundant_nops an…
markshannon Mar 6, 2025
1229037
Add a couple of asserts for NEXT_LOCATION
markshannon Mar 6, 2025
a077433
Replace NEXT_LOCATION with NO_LOCATION if there is no meaningful loca…
markshannon Mar 7, 2025
00380b3
Merge branch 'main' into location-pop-top-after-case
markshannon Mar 10, 2025
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Add a couple of asserts for NEXT_LOCATION
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@markshannon
markshannon committed Mar 6, 2025
commit 1229037783979e8b5bb2de22e2bfbbcb42ddfe3a
3 changes: 3 additions & 0 deletions Python/assemble.c
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Original file line number Diff line number Diff line change
Expand Up @@ -343,12 +343,15 @@ assemble_location_info(struct assembler *a, instr_sequence *instrs,
a->a_lineno = firstlineno;
location loc = NO_LOCATION;
int size = 0;
// The last location should not be NEXT_LOCATION, but don't crash non-debug builds
if (same_location(instrs->s_instrs[instrs->s_used-1].i_loc, NEXT_LOCATION)) {
assert(0 && "last instruction has NEXT_LOCATION");
instrs->s_instrs[instrs->s_used-1].i_loc = NO_LOCATION;
}
for (int i = instrs->s_used-1; i > 0; i--) {
instruction *instr = &instrs->s_instrs[i];
if (same_location(instr[-1].i_loc, NEXT_LOCATION)) {
assert(!IS_TERMINATOR_OPCODE(instr[-1].i_opcode));
instr[-1].i_loc = instr->i_loc;
}
}

@iritkatriel iritkatriel Mar 3, 2025

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I think this transformation should be in propagate_line_numbers in flowgraph.c. Otherwise the last instruction may remain without location, when it could have received a location from an earlier instruction in its block.

@markshannon markshannon Mar 3, 2025

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Wouldn't it be too early in propagate_line_numbers?
If the NEXT_LOCATION instruction is at the end of the block where would it get the location information from?

@iritkatriel iritkatriel Mar 3, 2025

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From the next block (fall through or jump). If there is more than one successor, then we have a problem anyway, right, so what do we do?

@markshannon markshannon Mar 5, 2025

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We should only use NEXT_LOCATION if instruction is not the last instruction in the block. I'll add an assert for that.

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