70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
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/*
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** $Id: lmem.h,v 1.43.1.1 2017/04/19 17:20:42 roberto Exp $
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** Interface to Memory Manager
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** See Copyright Notice in lua.h
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*/
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#ifndef lmem_h
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#define lmem_h
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#include <stddef.h>
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#include "llimits.h"
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#include "lua.h"
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/*
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** This macro reallocs a vector 'b' from 'on' to 'n' elements, where
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** each element has size 'e'. In case of arithmetic overflow of the
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** product 'n'*'e', it raises an error (calling 'luaM_toobig'). Because
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** 'e' is always constant, it avoids the runtime division MAX_SIZET/(e).
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**
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** (The macro is somewhat complex to avoid warnings: The 'sizeof'
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** comparison avoids a runtime comparison when overflow cannot occur.
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** The compiler should be able to optimize the real test by itself, but
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** when it does it, it may give a warning about "comparison is always
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** false due to limited range of data type"; the +1 tricks the compiler,
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** avoiding this warning but also this optimization.)
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*/
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#define luaM_reallocv(L,b,on,n,e) \
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(((sizeof(n) >= sizeof(size_t) && cast(size_t, (n)) + 1 > MAX_SIZET/(e)) \
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? luaM_toobig(L) : cast_void(0)) , \
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luaM_realloc_(L, (b), (on)*(e), (n)*(e)))
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/*
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** Arrays of chars do not need any test
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*/
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#define luaM_reallocvchar(L,b,on,n) \
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cast(char *, luaM_realloc_(L, (b), (on)*sizeof(char), (n)*sizeof(char)))
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#define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0)
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#define luaM_free(L, b) luaM_realloc_(L, (b), sizeof(*(b)), 0)
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#define luaM_freearray(L, b, n) luaM_realloc_(L, (b), (n)*sizeof(*(b)), 0)
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#define luaM_malloc(L,s) luaM_realloc_(L, NULL, 0, (s))
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#define luaM_new(L,t) cast(t *, luaM_malloc(L, sizeof(t)))
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#define luaM_newvector(L,n,t) \
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cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t)))
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#define luaM_newobject(L,tag,s) luaM_realloc_(L, NULL, tag, (s))
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#define luaM_growvector(L,v,nelems,size,t,limit,e) \
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if ((nelems)+1 > (size)) \
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((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e)))
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#define luaM_reallocvector(L, v,oldn,n,t) \
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((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t))))
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LUAI_FUNC l_noret luaM_toobig (lua_State *L);
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/* not to be called directly */
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LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
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size_t size);
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LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int *size,
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size_t size_elem, int limit,
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const char *what);
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#endif
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