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[Emacs-diffs] master 75ec1b1 1/2: Fix spurious regexp reentrancy error
From: |
Mattias Engdegård |
Subject: |
[Emacs-diffs] master 75ec1b1 1/2: Fix spurious regexp reentrancy error |
Date: |
Sat, 30 Mar 2019 06:58:36 -0400 (EDT) |
branch: master
commit 75ec1b1952633019f5afaf24dd87e7e4f7d31f9c
Author: Mattias Engdegård <address@hidden>
Commit: Mattias Engdegård <address@hidden>
Fix spurious regexp reentrancy error
* src/search.c (compile_pattern): Don't give up if the last regexp
cache entry is busy. Instead, use the last (least recently used)
non-busy entry, and only signal a reentrancy error if there is no free
entry at all (Bug#34910).
---
src/search.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/src/search.c b/src/search.c
index e15e2b9..07ff0e4 100644
--- a/src/search.c
+++ b/src/search.c
@@ -198,11 +198,13 @@ static struct regexp_cache *
compile_pattern (Lisp_Object pattern, struct re_registers *regp,
Lisp_Object translate, bool posix, bool multibyte)
{
- struct regexp_cache *cp, **cpp;
+ struct regexp_cache *cp, **cpp, **lru_nonbusy;
- for (cpp = &searchbuf_head; ; cpp = &cp->next)
+ for (cpp = &searchbuf_head, lru_nonbusy = NULL; ; cpp = &cp->next)
{
cp = *cpp;
+ if (!cp->busy)
+ lru_nonbusy = cpp;
/* Entries are initialized to nil, and may be set to nil by
compile_pattern_1 if the pattern isn't valid. Don't apply
string accessors in those cases. However, compile_pattern_1
@@ -222,13 +224,14 @@ compile_pattern (Lisp_Object pattern, struct re_registers
*regp,
&& cp->buf.charset_unibyte == charset_unibyte)
break;
- /* If we're at the end of the cache, compile into the nil cell
- we found, or the last (least recently used) cell with a
- string value. */
+ /* If we're at the end of the cache, compile into the last
+ (least recently used) non-busy cell in the cache. */
if (cp->next == 0)
{
- if (cp->busy)
+ if (!lru_nonbusy)
error ("Too much matching reentrancy");
+ cpp = lru_nonbusy;
+ cp = *cpp;
compile_it:
eassert (!cp->busy);
compile_pattern_1 (cp, pattern, translate, posix);