96 lines
3.3 KiB
C
96 lines
3.3 KiB
C
/*
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** $Id: lmem.h $
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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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#define luaM_error(L) luaD_throw(L, LUA_ERRMEM)
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/*
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** This macro tests whether it is safe to multiply 'n' by the size of
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** type 't' without overflows. Because 'e' is always constant, it avoids
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** the runtime division MAX_SIZET/(e).
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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_testsize(n,e) \
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(sizeof(n) >= sizeof(size_t) && cast_sizet((n)) + 1 > MAX_SIZET/(e))
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#define luaM_checksize(L,n,e) \
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(luaM_testsize(n,e) ? luaM_toobig(L) : cast_void(0))
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/*
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** Computes the minimum between 'n' and 'MAX_SIZET/sizeof(t)', so that
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** the result is not larger than 'n' and cannot overflow a 'size_t'
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** when multiplied by the size of type 't'. (Assumes that 'n' is an
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** 'int' or 'unsigned int' and that 'int' is not larger than 'size_t'.)
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*/
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#define luaM_limitN(n,t) \
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((cast_sizet(n) <= MAX_SIZET/sizeof(t)) ? (n) : \
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cast_uint((MAX_SIZET/sizeof(t))))
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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_charp(luaM_saferealloc_(L, (b), (on)*sizeof(char), (n)*sizeof(char)))
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#define luaM_freemem(L, b, s) luaM_free_(L, (b), (s))
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#define luaM_free(L, b) luaM_free_(L, (b), sizeof(*(b)))
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#define luaM_freearray(L, b, n) luaM_free_(L, (b), (n)*sizeof(*(b)))
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#define luaM_new(L,t) cast(t*, luaM_malloc_(L, sizeof(t), 0))
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#define luaM_newvector(L,n,t) cast(t*, luaM_malloc_(L, (n)*sizeof(t), 0))
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#define luaM_newvectorchecked(L,n,t) \
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(luaM_checksize(L,n,sizeof(t)), luaM_newvector(L,n,t))
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#define luaM_newobject(L,tag,s) luaM_malloc_(L, (s), tag)
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#define luaM_newblock(L, size) luaM_newvector(L, size, char)
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#define luaM_growvector(L,v,nelems,size,t,limit,e) \
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((v)=cast(t *, luaM_growaux_(L,v,nelems,&(size),sizeof(t), \
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luaM_limitN(limit,t),e)))
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#define luaM_reallocvector(L, v,oldn,n,t) \
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(cast(t *, luaM_realloc_(L, v, cast_sizet(oldn) * sizeof(t), \
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cast_sizet(n) * sizeof(t))))
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#define luaM_shrinkvector(L,v,size,fs,t) \
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((v)=cast(t *, luaM_shrinkvector_(L, v, &(size), fs, 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_saferealloc_ (lua_State *L, void *block, size_t oldsize,
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size_t size);
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LUAI_FUNC void luaM_free_ (lua_State *L, void *block, size_t osize);
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LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int nelems,
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int *size, int size_elem, int limit,
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const char *what);
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LUAI_FUNC void *luaM_shrinkvector_ (lua_State *L, void *block, int *nelem,
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int final_n, int size_elem);
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LUAI_FUNC void *luaM_malloc_ (lua_State *L, size_t size, int tag);
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#endif
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