mirror of
https://github.com/lua/lua.git
synced 2025-07-03 03:34:05 +00:00
e5f4927a0b
Array sizes are always int and are dumped as int, so there is no reason to read them back as unsigned.
96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
/*
|
|
** $Id: lmem.h $
|
|
** Interface to Memory Manager
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#ifndef lmem_h
|
|
#define lmem_h
|
|
|
|
|
|
#include <stddef.h>
|
|
|
|
#include "llimits.h"
|
|
#include "lua.h"
|
|
|
|
|
|
#define luaM_error(L) luaD_throw(L, LUA_ERRMEM)
|
|
|
|
|
|
/*
|
|
** This macro tests whether it is safe to multiply 'n' by the size of
|
|
** type 't' without overflows. Because 'e' is always constant, it avoids
|
|
** the runtime division MAX_SIZET/(e).
|
|
** (The macro is somewhat complex to avoid warnings: The 'sizeof'
|
|
** comparison avoids a runtime comparison when overflow cannot occur.
|
|
** The compiler should be able to optimize the real test by itself, but
|
|
** when it does it, it may give a warning about "comparison is always
|
|
** false due to limited range of data type"; the +1 tricks the compiler,
|
|
** avoiding this warning but also this optimization.)
|
|
*/
|
|
#define luaM_testsize(n,e) \
|
|
(sizeof(n) >= sizeof(size_t) && cast_sizet((n)) + 1 > MAX_SIZET/(e))
|
|
|
|
#define luaM_checksize(L,n,e) \
|
|
(luaM_testsize(n,e) ? luaM_toobig(L) : cast_void(0))
|
|
|
|
|
|
/*
|
|
** Computes the minimum between 'n' and 'MAX_SIZET/sizeof(t)', so that
|
|
** the result is not larger than 'n' and cannot overflow a 'size_t'
|
|
** when multiplied by the size of type 't'. (Assumes that 'n' is an
|
|
** 'int' and that 'int' is not larger than 'size_t'.)
|
|
*/
|
|
#define luaM_limitN(n,t) \
|
|
((cast_sizet(n) <= MAX_SIZET/sizeof(t)) ? (n) : \
|
|
cast_int((MAX_SIZET/sizeof(t))))
|
|
|
|
|
|
/*
|
|
** Arrays of chars do not need any test
|
|
*/
|
|
#define luaM_reallocvchar(L,b,on,n) \
|
|
cast_charp(luaM_saferealloc_(L, (b), (on)*sizeof(char), (n)*sizeof(char)))
|
|
|
|
#define luaM_freemem(L, b, s) luaM_free_(L, (b), (s))
|
|
#define luaM_free(L, b) luaM_free_(L, (b), sizeof(*(b)))
|
|
#define luaM_freearray(L, b, n) luaM_free_(L, (b), (n)*sizeof(*(b)))
|
|
|
|
#define luaM_new(L,t) cast(t*, luaM_malloc_(L, sizeof(t), 0))
|
|
#define luaM_newvector(L,n,t) \
|
|
cast(t*, luaM_malloc_(L, cast_sizet(n)*sizeof(t), 0))
|
|
#define luaM_newvectorchecked(L,n,t) \
|
|
(luaM_checksize(L,n,sizeof(t)), luaM_newvector(L,n,t))
|
|
|
|
#define luaM_newobject(L,tag,s) luaM_malloc_(L, (s), tag)
|
|
|
|
#define luaM_newblock(L, size) luaM_newvector(L, size, char)
|
|
|
|
#define luaM_growvector(L,v,nelems,size,t,limit,e) \
|
|
((v)=cast(t *, luaM_growaux_(L,v,nelems,&(size),sizeof(t), \
|
|
luaM_limitN(limit,t),e)))
|
|
|
|
#define luaM_reallocvector(L, v,oldn,n,t) \
|
|
(cast(t *, luaM_realloc_(L, v, cast_sizet(oldn) * sizeof(t), \
|
|
cast_sizet(n) * sizeof(t))))
|
|
|
|
#define luaM_shrinkvector(L,v,size,fs,t) \
|
|
((v)=cast(t *, luaM_shrinkvector_(L, v, &(size), fs, sizeof(t))))
|
|
|
|
LUAI_FUNC l_noret luaM_toobig (lua_State *L);
|
|
|
|
/* not to be called directly */
|
|
LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
|
|
size_t size);
|
|
LUAI_FUNC void *luaM_saferealloc_ (lua_State *L, void *block, size_t oldsize,
|
|
size_t size);
|
|
LUAI_FUNC void luaM_free_ (lua_State *L, void *block, size_t osize);
|
|
LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int nelems,
|
|
int *size, unsigned size_elem, int limit,
|
|
const char *what);
|
|
LUAI_FUNC void *luaM_shrinkvector_ (lua_State *L, void *block, int *nelem,
|
|
int final_n, unsigned size_elem);
|
|
LUAI_FUNC void *luaM_malloc_ (lua_State *L, size_t size, int tag);
|
|
|
|
#endif
|
|
|