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32853: redefine VARARR() to use heap rather than stack allocation

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enable old behavior via "configure --with-stack-allocation"
This commit is contained in:
Barton E. Schaefer 2014-07-24 08:45:16 -07:00
parent 77119afe19
commit 2f0efe9f59
4 changed files with 22 additions and 1 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2014-07-24 Barton E. Schaefer <schaefer@zsh.org>
* 32853: configure.ac, Src/mem.c, Src/zsh_system.h: redefine
the VARARR() macro to use heap rather than stack allocation;
enable old behavior via "configure --with-stack-allocation"
* unposted (see 32892): Src/builtins.c: 'fc -I' is an error
* 32903: Src/Modules/parameter.c: new empty (unset) elements in

5
Src/mem.c
View file

@ -950,7 +950,10 @@ zrealloc(void *ptr, size_t size)
ptr = NULL;
} else {
/* If ptr is NULL, then behave like malloc */
ptr = malloc(size);
if (!(ptr = (void *) malloc(size))) {
zerr("fatal error: out of memory");
exit(1);
}
}
unqueue_signals();

4
Src/zsh_system.h
View file

@ -286,11 +286,15 @@ struct timezone {
# include <limits.h>
#endif
#ifdef USE_STACK_ALLOCATION
#ifdef HAVE_VARIABLE_LENGTH_ARRAYS
# define VARARR(X,Y,Z) X (Y)[Z]
#else
# define VARARR(X,Y,Z) X *(Y) = (X *) alloca(sizeof(X) * (Z))
#endif
#else
# define VARARR(X,Y,Z) X *(Y) = (X *) zhalloc(sizeof(X) * (Z))
#endif
/* we should handle unlimited sizes from pathconf(_PC_PATH_MAX) */
/* but this is too much trouble */

10
configure.ac
View file

@ -140,6 +140,16 @@ AC_HELP_STRING([--enable-zsh-hash-debug], [turn on debugging of internal hash ta
AC_DEFINE(ZSH_HASH_DEBUG)
fi])
dnl Do you want to dynamically allocate memory on the stack where possible?
ifdef([stack-allocation],[undefine([stack-allocation])])dnl
AH_TEMPLATE([USE_STACK_ALLOCATION],
[Define to 1 if you want to allocate stack memory e.g. with `alloca'.])
AC_ARG_ENABLE(stack-allocation,
AC_HELP_STRING([--enable-stack-allocation], [allocate stack memory e.g. with `alloca']),
[if test x$enableval = xyes; then
AC_DEFINE(USE_STACK_ALLOCATION)
fi])
dnl Pathnames for global zsh scripts
ifdef([etcdir],[undefine([etcdir])])dnl
AC_ARG_ENABLE(etcdir,