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libiberty.h (MAX_ALLOCA_SIZE): New macro.

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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
This commit is contained in:
Aldy Hernandez 2016-07-29 16:40:55 +00:00 • committed by Aldy Hernandez
parent d51553e083
commit ac631cbe70
4 changed files with 28 additions and 3 deletions
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4
include/ChangeLog
View file

@ -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

11
include/libiberty.h
View file

@ -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.

5
libiberty/ChangeLog
View file

@ -1,3 +1,8 @@
2016-07-29 Aldy Hernandez <aldyh@redhat.com>
* make-relative-prefix.c (make_relative_prefix_1): Fall back to
malloc if alloca argument is greater than MAX_ALLOCA_SIZE.
2016-07-15 Jason Merrill <jason@redhat.com>
* cp-demangle.c (cplus_demangle_operators): Add f[lrLR].

11
libiberty/make-relative-prefix.c
View file

@ -233,6 +233,7 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
int i, n, common;
int needed_len;
char *ret = NULL, *ptr, *full_progname;
char *alloc_ptr = NULL;
if (progname == NULL || bin_prefix == NULL || prefix == NULL)
return NULL;
@ -256,7 +257,10 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
#ifdef HAVE_HOST_EXECUTABLE_SUFFIX
len += strlen (HOST_EXECUTABLE_SUFFIX);
#endif
nstore = (char *) alloca (len);
if (len < MAX_ALLOCA_SIZE)
nstore = (char *) alloca (len);
else
alloc_ptr = nstore = (char *) malloc (len);
startp = endp = temp;
while (1)
@ -312,12 +316,12 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
else
full_progname = strdup (progname);
if (full_progname == NULL)
return NULL;
goto bailout;
prog_dirs = split_directories (full_progname, &prog_num);
free (full_progname);
if (prog_dirs == NULL)
return NULL;
goto bailout;
bin_dirs = split_directories (bin_prefix, &bin_num);
if (bin_dirs == NULL)
@ -395,6 +399,7 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
free_split_directories (prog_dirs);
free_split_directories (bin_dirs);
free_split_directories (prefix_dirs);
free (alloc_ptr);
return ret;
}