/* ** $Id: lmem.h,v 1.43.1.1 2017/04/19 17:20:42 roberto Exp $ ** Interface to Memory Manager ** See Copyright Notice in lua.h */ #ifndef lmem_h #define lmem_h #include #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