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macro 'luai_makeseed' now controls the whole process of making the seed

This commit is contained in:
Roberto Ierusalimschy 2018-05-29 15:02:51 -03:00
parent 950fbcb971
commit 97e394ba18
1 changed files with 17 additions and 17 deletions
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34
lstate.c
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@ -1,5 +1,5 @@
/*
** $Id: lstate.c,v 2.150 2018/01/28 15:13:26 roberto Exp roberto $
** $Id: lstate.c,v 2.151 2018/02/05 17:11:37 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
@ -29,17 +29,6 @@
/*
** a macro to help the creation of a unique random seed when a state is
** created; the seed is used to randomize hashes.
*/
#if !defined(luai_makeseed)
#include <time.h>
#define luai_makeseed() cast_uint(time(NULL))
#endif
/*
** thread state + extra space
*/
@ -63,16 +52,25 @@ typedef struct LG {
/*
** Compute an initial seed as random as possible. Rely on Address Space
** Layout Randomization (if present) to increase randomness..
** A macro to create a "random" seed when a state is created;
** the seed is used to randomize string hashes.
*/
#if !defined(luai_makeseed)
#include <time.h>
/*
** Compute an initial seed with some level of randomness.
** Rely on Address Space Layout Randomization (if present) and
** current time.
*/
#define addbuff(b,p,e) \
{ size_t t = cast_sizet(e); \
memcpy(b + p, &t, sizeof(t)); p += sizeof(t); }
static unsigned int makeseed (lua_State *L) {
static unsigned int luai_makeseed (lua_State *L) {
char buff[4 * sizeof(size_t)];
unsigned int h = luai_makeseed();
unsigned int h = cast_uint(time(NULL));
int p = 0;
addbuff(buff, p, L); /* heap variable */
addbuff(buff, p, &h); /* local variable */
@ -82,6 +80,8 @@ static unsigned int makeseed (lua_State *L) {
return luaS_hash(buff, p, h);
}
#endif
/*
** set GCdebt to a new value keeping the value (totalbytes + GCdebt)
@ -327,7 +327,7 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
g->frealloc = f;
g->ud = ud;
g->mainthread = L;
g->seed = makeseed(L);
g->seed = luai_makeseed(L);
g->gcrunning = 0; /* no GC while building state */
g->strt.size = g->strt.nuse = 0;
g->strt.hash = NULL;