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| author | YU Jincheng | 2021-09-29 17:37:26 +0800 |
|---|---|---|
| committer | Denys Vlasenko | 2021-10-07 15:22:35 +0200 |
| commit | 1f925038ab9c6bd8f6b3cd40ed7aab0ef10d898e (patch) | |
| tree | a625455a60081738812f469de6a02010f0c5b252 /shell/ash.c | |
| parent | 17e6fb06b3d36eae11575b226858e8474e2b46d3 (diff) | |
| download | busybox-1f925038ab9c6bd8f6b3cd40ed7aab0ef10d898e.zip busybox-1f925038ab9c6bd8f6b3cd40ed7aab0ef10d898e.tar.gz | |
*: generalize "const trick"
While at it, change all "__asm__" to "asm"
Co-authored-by: canyie <31466456+canyie@users.noreply.github.com>
Signed-off-by: YU Jincheng <shana@zju.edu.cn>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell/ash.c')
| -rw-r--r-- | shell/ash.c | 23 |
1 files changed, 3 insertions, 20 deletions
diff --git a/shell/ash.c b/shell/ash.c index 4bf0615..7b85981 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -303,20 +303,6 @@ typedef long arith_t; # error "Do not even bother, ash will not run on NOMMU machine" #endif -/* We use a trick to have more optimized code (fewer pointer reloads): - * ash.c: extern struct globals *const ash_ptr_to_globals; - * ash_ptr_hack.c: struct globals *ash_ptr_to_globals; - * This way, compiler in ash.c knows the pointer can not change. - * - * However, this may break on weird arches or toolchains. In this case, - * set "-DBB_GLOBAL_CONST=''" in CONFIG_EXTRA_CFLAGS to disable - * this optimization. - */ -#ifndef BB_GLOBAL_CONST -# define BB_GLOBAL_CONST const -#endif - - /* ============ Hash table sizes. Configurable. */ #define VTABSIZE 39 @@ -518,8 +504,7 @@ extern struct globals_misc *BB_GLOBAL_CONST ash_ptr_to_globals_misc; #define random_gen (G_misc.random_gen ) #define backgndpid (G_misc.backgndpid ) #define INIT_G_misc() do { \ - (*(struct globals_misc**)not_const_pp(&ash_ptr_to_globals_misc)) = xzalloc(sizeof(G_misc)); \ - barrier(); \ + ASSIGN_CONST_PTR(ash_ptr_to_globals_misc, xzalloc(sizeof(G_misc))); \ savestatus = -1; \ curdir = nullstr; \ physdir = nullstr; \ @@ -1597,8 +1582,7 @@ extern struct globals_memstack *BB_GLOBAL_CONST ash_ptr_to_globals_memstack; #define g_stacknleft (G_memstack.g_stacknleft) #define stackbase (G_memstack.stackbase ) #define INIT_G_memstack() do { \ - (*(struct globals_memstack**)not_const_pp(&ash_ptr_to_globals_memstack)) = xzalloc(sizeof(G_memstack)); \ - barrier(); \ + ASSIGN_CONST_PTR(ash_ptr_to_globals_memstack, xzalloc(sizeof(G_memstack))); \ g_stackp = &stackbase; \ g_stacknxt = stackbase.space; \ g_stacknleft = MINSIZE; \ @@ -2229,8 +2213,7 @@ extern struct globals_var *BB_GLOBAL_CONST ash_ptr_to_globals_var; #endif #define INIT_G_var() do { \ unsigned i; \ - (*(struct globals_var**)not_const_pp(&ash_ptr_to_globals_var)) = xzalloc(sizeof(G_var)); \ - barrier(); \ + ASSIGN_CONST_PTR(ash_ptr_to_globals_var, xzalloc(sizeof(G_var))); \ for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \ varinit[i].flags = varinit_data[i].flags; \ varinit[i].var_text = varinit_data[i].var_text; \ |