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author | kyren <kerriganw@gmail.com> | 2017-05-21 19:50:59 -0400 |
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committer | kyren <kerriganw@gmail.com> | 2017-05-21 19:50:59 -0400 |
commit | 065c69894a08dc52e7a1baba9154681d6c0fa834 (patch) | |
tree | 76bcf03a8aa291f465dfb5f216389a21baaa5d1a /lua/lmem.h | |
download | mlua-065c69894a08dc52e7a1baba9154681d6c0fa834.zip |
Initial import
Diffstat (limited to 'lua/lmem.h')
-rw-r--r-- | lua/lmem.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/lua/lmem.h b/lua/lmem.h new file mode 100644 index 0000000..30f4848 --- /dev/null +++ b/lua/lmem.h @@ -0,0 +1,69 @@ +/* +** $Id: lmem.h,v 1.43 2014/12/19 17:26:14 roberto Exp $ +** 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" + + +/* +** This macro reallocs a vector 'b' from 'on' to 'n' elements, where +** each element has size 'e'. In case of arithmetic overflow of the +** product 'n'*'e', it raises an error (calling 'luaM_toobig'). 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_reallocv(L,b,on,n,e) \ + (((sizeof(n) >= sizeof(size_t) && cast(size_t, (n)) + 1 > MAX_SIZET/(e)) \ + ? luaM_toobig(L) : cast_void(0)) , \ + luaM_realloc_(L, (b), (on)*(e), (n)*(e))) + +/* +** Arrays of chars do not need any test +*/ +#define luaM_reallocvchar(L,b,on,n) \ + cast(char *, luaM_realloc_(L, (b), (on)*sizeof(char), (n)*sizeof(char))) + +#define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0) +#define luaM_free(L, b) luaM_realloc_(L, (b), sizeof(*(b)), 0) +#define luaM_freearray(L, b, n) luaM_realloc_(L, (b), (n)*sizeof(*(b)), 0) + +#define luaM_malloc(L,s) luaM_realloc_(L, NULL, 0, (s)) +#define luaM_new(L,t) cast(t *, luaM_malloc(L, sizeof(t))) +#define luaM_newvector(L,n,t) \ + cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t))) + +#define luaM_newobject(L,tag,s) luaM_realloc_(L, NULL, tag, (s)) + +#define luaM_growvector(L,v,nelems,size,t,limit,e) \ + if ((nelems)+1 > (size)) \ + ((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e))) + +#define luaM_reallocvector(L, v,oldn,n,t) \ + ((v)=cast(t *, luaM_reallocv(L, v, oldn, n, 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_growaux_ (lua_State *L, void *block, int *size, + size_t size_elem, int limit, + const char *what); + +#endif + |