code for conversion macros moved from luaconf to llimits + 'uint'

renamed to 'unsigned' in those macros
This commit is contained in:
Roberto Ierusalimschy 2010-11-03 13:16:17 -02:00
parent fdd5f2f7a3
commit f1629217f1
3 changed files with 101 additions and 103 deletions

6
lapi.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 2.138 2010/10/25 19:01:37 roberto Exp roberto $
** $Id: lapi.c,v 2.139 2010/10/25 20:31:11 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -353,7 +353,7 @@ LUA_API lua_Unsigned lua_tounsignedx (lua_State *L, int idx, int *isnum) {
if (tonumber(o, &n)) {
lua_Unsigned res;
lua_Number num = nvalue(o);
lua_number2uint(res, num);
lua_number2unsigned(res, num);
if (isnum) *isnum = 1;
return res;
}
@ -472,7 +472,7 @@ LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
LUA_API void lua_pushunsigned (lua_State *L, lua_Unsigned u) {
lua_Number n;
lua_lock(L);
n = lua_uint2number(u);
n = lua_unsigned2number(u);
setnvalue(L->top, n);
api_incr_top(L);
lua_unlock(L);

View File

@ -1,5 +1,5 @@
/*
** $Id: llimits.h,v 1.81 2010/05/24 19:29:46 roberto Exp roberto $
** $Id: llimits.h,v 1.82 2010/05/31 16:08:55 roberto Exp roberto $
** Limits, basic types, and some other `installation-dependent' definitions
** See Copyright Notice in lua.h
*/
@ -168,6 +168,95 @@ typedef lu_int32 Instruction;
#define luai_userstateyield(L,n) ((void)L)
#endif
/*
** lua_number2int is a macro to convert lua_Number to int.
** lua_number2integer is a macro to convert lua_Number to LUA_INTEGER.
** lua_number2unsigned is a macro to convert a lua_Number to a LUA_UNSIGNED.
** lua_unsigned2number is a macro to convert a LUA_UNSIGNED to a lua_Number.
*/
#if defined(MS_ASMTRICK) /* { */
/* trick with Microsoft assembler for X86 */
#define lua_number2int(i,n) __asm {__asm fld n __asm fistp i}
#define lua_number2integer(i,n) lua_number2int(i, n)
#define lua_number2unsigned(i,n) \
{__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;}
#elif defined(LUA_IEEE754TRICK) /* }{ */
/* the next trick should work on any machine using IEEE754 with
a 32-bit integer type */
union luai_Cast { double l_d; LUA_INT32 l_p[2]; };
#if !defined(LUA_IEEEENDIAN) /* { */
#define LUAI_EXTRAIEEE \
static const union luai_Cast ieeeendian = {-(33.0 + 6755399441055744.0)};
#define LUA_IEEEENDIAN (ieeeendian.l_p[1] == 33)
#else
#define LUAI_EXTRAIEEE /* empty */
#endif /* } */
#define lua_number2int32(i,n,t) \
{ LUAI_EXTRAIEEE \
volatile union luai_Cast u; u.l_d = (n) + 6755399441055744.0; \
(i) = (t)u.l_p[LUA_IEEEENDIAN]; }
#define lua_number2int(i,n) lua_number2int32(i, n, int)
#define lua_number2integer(i,n) lua_number2int32(i, n, LUA_INTEGER)
#define lua_number2unsigned(i,n) lua_number2int32(i, n, LUA_UNSIGNED)
#endif /* } */
/* the following definitions always work, but may be slow */
#if !defined(lua_number2int)
#define lua_number2int(i,n) ((i)=(int)(n))
#endif
#if !defined(lua_number2integer)
#define lua_number2integer(i,n) ((i)=(LUA_INTEGER)(n))
#endif
#if !defined(lua_number2unsigned) /* { */
/* the following definition assures proper modulo behavior */
#if defined(LUA_NUMBER_DOUBLE)
#include <math.h>
#define lua_number2unsigned(i,n) \
((i)=(LUA_UNSIGNED)((n) - floor((n)/4294967296.0)*4294967296.0))
#else
#define lua_number2unsigned(i,n) ((i)=(LUA_UNSIGNED)(n))
#endif
#endif /* } */
#if !defined(lua_unsigned2number)
/* on several machines, coercion from unsigned to double is slow,
so it may be worth to avoid */
#define lua_unsigned2number(u) \
((LUA_INT32)(u) < 0 ? (lua_Number)(u) : (lua_Number)(LUA_INT32)(u))
#endif
/*
** luai_hashnum is a macro do hash a lua_Number value into an integer.
** The hash must be deterministic and give reasonable values for
** both small and large values (outside the range of integers).
** It is used only in ltable.c.
*/
#if !defined(luai_hashnum) /* { */
#include <float.h>
#include <math.h>
#define luai_hashnum(i,n) { int e; \
n = frexp(n, &e) * (lua_Number)(INT_MAX - DBL_MAX_EXP); \
lua_number2int(i, n); i += e; }
#endif /* } */

107
luaconf.h
View File

@ -1,5 +1,5 @@
/*
** $Id: luaconf.h,v 1.147 2010/10/29 11:13:21 roberto Exp roberto $
** $Id: luaconf.h,v 1.148 2010/10/29 17:52:46 roberto Exp roberto $
** Configuration file for Lua
** See Copyright Notice in lua.h
*/
@ -348,27 +348,13 @@
/*
** {==================================================================
** CHANGE (to smaller values) the following definitions if your system
** has a small C stack. (Or you may want to change them to larger
** values if your system has a large C stack and these limits are
** too rigid for you.) Some of these constants control the size of
** stack-allocated arrays used by the compiler or the interpreter, while
** others limit the maximum number of recursive calls that the compiler
** or the interpreter can perform. Values too large may cause a C stack
** overflow for some forms of deep constructs.
** ===================================================================
*/
/*
@@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
** CHANGE it if it uses too much C-stack space.
*/
#define LUAL_BUFFERSIZE BUFSIZ
/* }================================================================== */
@ -445,32 +431,21 @@
#define LUA_UNSIGNED unsigned LUA_INT32
/*
@@ lua_number2int is a macro to convert lua_Number to int.
@@ lua_number2integer is a macro to convert lua_Number to LUA_INTEGER.
@@ lua_number2uint is a macro to convert a lua_Number to a LUA_UNSIGNED.
@@ lua_uint2number is a macro to convert a LUA_UNSIGNED to a lua_Number.
*/
#if defined(LUA_CORE) /* { */
#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) && \
!defined(LUA_NOIEEE754TRICK) /* { */
#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) /* { */
/* On a Microsoft compiler on a Pentium, use assembler to avoid clashes
with a DirectX idiosyncrasy */
#if defined(_MSC_VER) && defined(M_IX86) /* { */
#define lua_number2int(i,n) __asm {__asm fld n __asm fistp i}
#define lua_number2integer(i,n) lua_number2int(i, n)
#define lua_number2uint(i,n) \
{__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;}
#define MS_ASMTRICK
#else /* }{ */
/* the next trick should work on any machine using IEEE754 with
a 32-bit integer type */
/* the next definition uses a trick that should work on any machine
using IEEE754 with a 32-bit integer type */
union luai_Cast { double l_d; LUA_INT32 l_p[2]; };
#define LUA_IEEE754TRICK
/*
@@ LUA_IEEEENDIAN is the endianness of doubles in your machine
@ -485,77 +460,11 @@ union luai_Cast { double l_d; LUA_INT32 l_p[2]; };
#define LUA_IEEEENDIAN 1
#endif
#if !defined(LUA_IEEEENDIAN) /* { */
#define LUAI_EXTRAIEEE \
static const union luai_Cast ieeeendian = {-(33.0 + 6755399441055744.0)};
#define LUA_IEEEENDIAN (ieeeendian.l_p[1] == 33)
#else
#define LUAI_EXTRAIEEE /* empty */
#endif /* } */
#define lua_number2int32(i,n,t) \
{ LUAI_EXTRAIEEE \
volatile union luai_Cast u; u.l_d = (n) + 6755399441055744.0; \
(i) = (t)u.l_p[LUA_IEEEENDIAN]; }
#define lua_number2int(i,n) lua_number2int32(i, n, int)
#define lua_number2integer(i,n) lua_number2int32(i, n, LUA_INTEGER)
#define lua_number2uint(i,n) lua_number2int32(i, n, LUA_UNSIGNED)
#endif /* } */
#endif /* } */
/* the following definitions always work, but may be slow */
#if !defined(lua_number2int)
#define lua_number2int(i,n) ((i)=(int)(n))
#endif
#if !defined(lua_number2integer)
#define lua_number2integer(i,n) ((i)=(LUA_INTEGER)(n))
#endif
#if !defined(lua_number2uint) && (defined(lapi_c) || defined(luaall_c)) /* { */
/* the following definition assures proper modulo behavior */
#if defined(LUA_NUMBER_DOUBLE)
#include <math.h>
#define lua_number2uint(i,n) \
((i)=(LUA_UNSIGNED)((n) - floor((n)/4294967296.0)*4294967296.0))
#else
#define lua_number2uint(i,n) ((i)=(LUA_UNSIGNED)(n))
#endif
#endif /* } */
#if !defined(lua_uint2number)
/* on several machines, coercion from unsigned to double is slow,
so it may be worth to avoid */
#define lua_uint2number(u) \
((LUA_INT32)(u) < 0 ? (lua_Number)(u) : (lua_Number)(LUA_INT32)(u))
#endif
#endif /* } */
/*
@@ luai_hashnum is a macro do hash a lua_Number value into an integer.
@* The hash must be deterministic and give reasonable values for
@* both small and large values (outside the range of integers).
@* It is used only in ltable.c.
*/
#if defined(ltable_c) || defined(luaall_c)
#include <float.h>
#include <math.h>
#define luai_hashnum(i,n) { int e; \
n = frexp(n, &e) * (lua_Number)(INT_MAX - DBL_MAX_EXP); \
lua_number2int(i, n); i += e; }
#endif /* ltable_c */
#endif /* } */
/* }================================================================== */