diff options
| author | Aldy Hernandez <aldyh@redhat.com> | 2016-07-29 16:40:55 +0000 |
|---|---|---|
| committer | Aldy Hernandez <aldyh@gcc.gnu.org> | 2016-07-29 16:40:55 +0000 |
| commit | ac631cbe7021105c7fb8438deaeef66fe544b9aa (patch) | |
| tree | 3d4145b4bb447027e2ff796ee99f67e8c5f563b3 /include | |
| parent | d51553e083cbed3f5c334573adc999654fb26df2 (diff) | |
| download | gcc-ac631cbe7021105c7fb8438deaeef66fe544b9aa.tar.gz | |
libiberty.h (MAX_ALLOCA_SIZE): New macro.
include/
* libiberty.h (MAX_ALLOCA_SIZE): New macro.
libiberty/
* make-relative-prefix.c (make_relative_prefix_1): Fall back to
malloc if alloca argument is greater than MAX_ALLOCA_SIZE.
From-SVN: r238880
Diffstat (limited to 'include')
| -rw-r--r-- | include/ChangeLog | 4 | ||||
| -rw-r--r-- | include/libiberty.h | 11 |
2 files changed, 15 insertions, 0 deletions
diff --git a/include/ChangeLog b/include/ChangeLog index 8b46056ce31..06be0281e26 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,7 @@ +2016-07-29 Aldy Hernandez <aldyh@redhat.com> + + * libiberty.h (MAX_ALLOCA_SIZE): New macro. + 2016-05-26 Chung-Lin Tang <cltang@codesourcery.com> * gomp-constants.h (GOMP_VERSION): Increment to 1, add comment to diff --git a/include/libiberty.h b/include/libiberty.h index a9c885fc670..605ff56abd8 100644 --- a/include/libiberty.h +++ b/include/libiberty.h @@ -397,6 +397,17 @@ extern void hex_init (void); /* Save files used for communication between processes. */ #define PEX_SAVE_TEMPS 0x4 +/* Max number of alloca bytes per call before we must switch to malloc. + + ?? Swiped from gnulib's regex_internal.h header. Is this actually + the case? This number seems arbitrary, though sane. + + The OS usually guarantees only one guard page at the bottom of the stack, + and a page size can be as small as 4096 bytes. So we cannot safely + allocate anything larger than 4096 bytes. Also care for the possibility + of a few compiler-allocated temporary stack slots. */ +#define MAX_ALLOCA_SIZE 4032 + /* Prepare to execute one or more programs, with standard output of each program fed to standard input of the next. FLAGS As above. |