diff options
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 8b46056..06be028 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 a9c885f..605ff56 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. |