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| author | Paul Eggert <eggert@cs.ucla.edu> | 2017-08-29 14:20:47 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2017-08-29 14:58:49 -0700 |
| commit | 9baeed3514fe60189f3bf935c380da92659b7f59 (patch) | |
| tree | eb542d01212b4085203456beb62d15e5a2cb0f3d /lisp/emacs-lisp | |
| parent | f1fdb5bc575728bd6c9f13a18939d9c271a74e83 (diff) | |
| download | emacs-9baeed3514fe60189f3bf935c380da92659b7f59.tar.gz emacs-9baeed3514fe60189f3bf935c380da92659b7f59.tar.bz2 emacs-9baeed3514fe60189f3bf935c380da92659b7f59.zip | |
Improve stack-top heuristic
This is needed for gcc -Os -flto on x86-64; otherwise, GC misses part
of the stack when scanning for heap roots, causing Emacs to crash
later (Bug#28213). The problem is that Emacs's hack for getting an
address near the stack top does not work when link-time optimization
moves stack variables around.
* configure.ac (HAVE___BUILTIN_FRAME_ADDRESS): New macro.
* lib-src/make-docfile.c (DEFUN_noinline): New constant.
(write_globals, scan_c_stream): Support noinline.
* src/alloc.c (NEAR_STACK_TOP): New macro.
(SET_STACK_TOP_ADDRESS): Use it.
(flush_stack_call_func, Fgarbage_collect): Now noinline.
Diffstat (limited to 'lisp/emacs-lisp')
0 files changed, 0 insertions, 0 deletions