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| author | Lysandros Nikolaou <lisandrosnik@gmail.com> | 2020-10-31 18:31:41 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-10-31 18:31:41 (GMT) |
| commit | 02cdfc93f82fecdb7eae97a868d4ee222b9875d9 (patch) | |
| tree | 85ec4c7f233e9bff63b0e6af21049ec00d7e0af9 /Tools | |
| parent | d21cb2d5ee56b8975d92e2ee094aba81f0801be5 (diff) | |
| download | cpython-02cdfc93f82fecdb7eae97a868d4ee222b9875d9.zip cpython-02cdfc93f82fecdb7eae97a868d4ee222b9875d9.tar.gz cpython-02cdfc93f82fecdb7eae97a868d4ee222b9875d9.tar.bz2 | |
bpo-42218: Correctly handle errors in left-recursive rules (GH-23065)
Left-recursive rules need to check for errors explicitly, since
even if the rule returns NULL, the parsing might continue and lead
to long-distance failures.
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
Diffstat (limited to 'Tools')
| -rw-r--r-- | Tools/peg_generator/pegen/c_generator.py | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Tools/peg_generator/pegen/c_generator.py b/Tools/peg_generator/pegen/c_generator.py index 52bdb84..6af0d3f 100644 --- a/Tools/peg_generator/pegen/c_generator.py +++ b/Tools/peg_generator/pegen/c_generator.py @@ -502,6 +502,9 @@ class CParserGenerator(ParserGenerator, GrammarVisitor): ) self.print("p->mark = _mark;") self.print(f"void *_raw = {node.name}_raw(p);") + self.print("if (p->error_indicator)") + with self.indent(): + self.print("return NULL;") self.print("if (_raw == NULL || p->mark <= _resmark)") with self.indent(): self.print("break;") |