[Python-checkins] GH-91409: Don't overwrite valid locations with NOP locations (GH-95067)
brandtbucher
webhook-mailer at python.org
Wed Jul 20 17:27:40 EDT 2022
https://github.com/python/cpython/commit/742d4614e1a645d765dbf76c19bd9a818239b1cb
commit: 742d4614e1a645d765dbf76c19bd9a818239b1cb
branch: main
author: Brandt Bucher <brandtbucher at microsoft.com>
committer: brandtbucher <brandtbucher at gmail.com>
date: 2022-07-20T14:27:31-07:00
summary:
GH-91409: Don't overwrite valid locations with NOP locations (GH-95067)
files:
A Misc/NEWS.d/next/Core and Builtins/2022-07-20-13-46-01.gh-issue-91409.dhL8Zo.rst
M Lib/test/test_compile.py
M Python/compile.c
diff --git a/Lib/test/test_compile.py b/Lib/test/test_compile.py
index bc022a9f5cbe7..19e47cb44f60a 100644
--- a/Lib/test/test_compile.py
+++ b/Lib/test/test_compile.py
@@ -1202,6 +1202,44 @@ def test_multiline_assert_rewritten_as_method_call(self):
tree.body[0] = new_node
compile(tree, "<test>", "exec")
+ def test_push_null_load_global_positions(self):
+ source_template = """
+ import abc, dis
+ import ast as art
+
+ abc = None
+ dix = dis
+ ast = art
+
+ def f():
+ {}
+ """
+ for body in [
+ " abc.a()",
+ " art.a()",
+ " ast.a()",
+ " dis.a()",
+ " dix.a()",
+ " abc[...]()",
+ " art()()",
+ " (ast or ...)()",
+ " [dis]()",
+ " (dix + ...)()",
+ ]:
+ with self.subTest(body):
+ namespace = {}
+ source = textwrap.dedent(source_template.format(body))
+ exec(source, namespace)
+ code = namespace["f"].__code__
+ self.assertOpcodeSourcePositionIs(
+ code,
+ "LOAD_GLOBAL",
+ line=10,
+ end_line=10,
+ column=4,
+ end_column=7,
+ )
+
class TestExpressionStackSize(unittest.TestCase):
# These tests check that the computed stack size for a code object
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-07-20-13-46-01.gh-issue-91409.dhL8Zo.rst b/Misc/NEWS.d/next/Core and Builtins/2022-07-20-13-46-01.gh-issue-91409.dhL8Zo.rst
new file mode 100644
index 0000000000000..2bc0d8224c6a0
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-07-20-13-46-01.gh-issue-91409.dhL8Zo.rst
@@ -0,0 +1,2 @@
+Fix incorrect source location info caused by certain optimizations in the
+bytecode compiler.
diff --git a/Python/compile.c b/Python/compile.c
index 20eca059d30f1..52b7d9242eb2b 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -9278,7 +9278,10 @@ clean_basic_block(basicblock *bb) {
/* or, if the next instruction has same line number or no line number */
if (src < bb->b_iused - 1) {
int next_lineno = bb->b_instr[src+1].i_loc.lineno;
- if (next_lineno < 0 || next_lineno == lineno) {
+ if (next_lineno == lineno) {
+ continue;
+ }
+ if (next_lineno < 0) {
bb->b_instr[src+1].i_loc = bb->b_instr[src].i_loc;
continue;
}
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