diff options
Diffstat (limited to 'lua/llimits.h')
| -rw-r--r-- | lua/llimits.h | 280 |
1 files changed, 147 insertions, 133 deletions
diff --git a/lua/llimits.h b/lua/llimits.h index 152dd05..f21377f 100644 --- a/lua/llimits.h +++ b/lua/llimits.h @@ -1,6 +1,6 @@ /* -** $Id: llimits.h,v 1.103.1.1 2013/04/12 18:48:47 roberto Exp $ -** Limits, basic types, and some other `installation-dependent' definitions +** $Id: llimits.h,v 1.141 2015/11/19 19:16:22 roberto Exp $ +** Limits, basic types, and some other 'installation-dependent' definitions ** See Copyright Notice in lua.h */ @@ -14,54 +14,77 @@ #include "lua.h" - -typedef unsigned LUA_INT32 lu_int32; - +/* +** 'lu_mem' and 'l_mem' are unsigned/signed integers big enough to count +** the total memory used by Lua (in bytes). Usually, 'size_t' and +** 'ptrdiff_t' should work, but we use 'long' for 16-bit machines. +*/ +#if defined(LUAI_MEM) /* { external definitions? */ typedef LUAI_UMEM lu_mem; - typedef LUAI_MEM l_mem; +#elif LUAI_BITSINT >= 32 /* }{ */ +typedef size_t lu_mem; +typedef ptrdiff_t l_mem; +#else /* 16-bit ints */ /* }{ */ +typedef unsigned long lu_mem; +typedef long l_mem; +#endif /* } */ - -/* chars used as small naturals (so that `char' is reserved for characters) */ +/* chars used as small naturals (so that 'char' is reserved for characters) */ typedef unsigned char lu_byte; -#define MAX_SIZET ((size_t)(~(size_t)0)-2) +/* maximum value for size_t */ +#define MAX_SIZET ((size_t)(~(size_t)0)) + +/* maximum size visible for Lua (must be representable in a lua_Integer */ +#define MAX_SIZE (sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \ + : (size_t)(LUA_MAXINTEGER)) + -#define MAX_LUMEM ((lu_mem)(~(lu_mem)0)-2) +#define MAX_LUMEM ((lu_mem)(~(lu_mem)0)) -#define MAX_LMEM ((l_mem) ((MAX_LUMEM >> 1) - 2)) +#define MAX_LMEM ((l_mem)(MAX_LUMEM >> 1)) -#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */ +#define MAX_INT INT_MAX /* maximum value of an int */ + /* -** conversion of pointer to integer +** conversion of pointer to unsigned integer: ** this is for hashing only; there is no problem if the integer ** cannot hold the whole pointer value */ -#define IntPoint(p) ((unsigned int)(lu_mem)(p)) +#define point2uint(p) ((unsigned int)((size_t)(p) & UINT_MAX)) /* type to ensure maximum alignment */ -#if !defined(LUAI_USER_ALIGNMENT_T) -#define LUAI_USER_ALIGNMENT_T union { double u; void *s; long l; } +#if defined(LUAI_USER_ALIGNMENT_T) +typedef LUAI_USER_ALIGNMENT_T L_Umaxalign; +#else +typedef union { + lua_Number n; + double u; + void *s; + lua_Integer i; + long l; +} L_Umaxalign; #endif -typedef LUAI_USER_ALIGNMENT_T L_Umaxalign; -/* result of a `usual argument conversion' over lua_Number */ +/* types of 'usual argument conversions' for lua_Number and lua_Integer */ typedef LUAI_UACNUMBER l_uacNumber; +typedef LUAI_UACINT l_uacInt; /* internal assertions for in-house debugging */ #if defined(lua_assert) #define check_exp(c,e) (lua_assert(c), (e)) /* to avoid problems with conditions too long */ -#define lua_longassert(c) { if (!(c)) lua_assert(0); } +#define lua_longassert(c) ((c) ? (void)0 : lua_assert(0)) #else #define lua_assert(c) ((void)0) #define check_exp(c,e) (e) @@ -72,38 +95,49 @@ typedef LUAI_UACNUMBER l_uacNumber; ** assertion for checking API calls */ #if !defined(luai_apicheck) - -#if defined(LUA_USE_APICHECK) -#include <assert.h> -#define luai_apicheck(L,e) assert(e) -#else -#define luai_apicheck(L,e) lua_assert(e) -#endif - +#define luai_apicheck(l,e) lua_assert(e) #endif #define api_check(l,e,msg) luai_apicheck(l,(e) && msg) +/* macro to avoid warnings about unused variables */ #if !defined(UNUSED) -#define UNUSED(x) ((void)(x)) /* to avoid warnings */ +#define UNUSED(x) ((void)(x)) #endif +/* type casts (a macro highlights casts in the code) */ #define cast(t, exp) ((t)(exp)) +#define cast_void(i) cast(void, (i)) #define cast_byte(i) cast(lu_byte, (i)) #define cast_num(i) cast(lua_Number, (i)) #define cast_int(i) cast(int, (i)) #define cast_uchar(i) cast(unsigned char, (i)) +/* cast a signed lua_Integer to lua_Unsigned */ +#if !defined(l_castS2U) +#define l_castS2U(i) ((lua_Unsigned)(i)) +#endif + +/* +** cast a lua_Unsigned to a signed lua_Integer; this cast is +** not strict ISO C, but two-complement architectures should +** work fine. +*/ +#if !defined(l_castU2S) +#define l_castU2S(i) ((lua_Integer)(i)) +#endif + + /* ** non-return type */ #if defined(__GNUC__) #define l_noret void __attribute__((noreturn)) -#elif defined(_MSC_VER) +#elif defined(_MSC_VER) && _MSC_VER >= 1200 #define l_noret void __declspec(noreturn) #else #define l_noret void @@ -119,29 +153,50 @@ typedef LUAI_UACNUMBER l_uacNumber; #define LUAI_MAXCCALLS 200 #endif -/* -** maximum number of upvalues in a closure (both C and Lua). (Value -** must fit in an unsigned char.) -*/ -#define MAXUPVAL UCHAR_MAX /* -** type for virtual-machine instructions +** type for virtual-machine instructions; ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h) */ -typedef lu_int32 Instruction; - +#if LUAI_BITSINT >= 32 +typedef unsigned int Instruction; +#else +typedef unsigned long Instruction; +#endif -/* maximum stack for a Lua function */ -#define MAXSTACK 250 +/* +** Maximum length for short strings, that is, strings that are +** internalized. (Cannot be smaller than reserved words or tags for +** metamethods, as these strings must be internalized; +** #("function") = 8, #("__newindex") = 10.) +*/ +#if !defined(LUAI_MAXSHORTLEN) +#define LUAI_MAXSHORTLEN 40 +#endif -/* minimum size for the string table (must be power of 2) */ +/* +** Initial size for the string table (must be power of 2). +** The Lua core alone registers ~50 strings (reserved words + +** metaevent keys + a few others). Libraries would typically add +** a few dozens more. +*/ #if !defined(MINSTRTABSIZE) -#define MINSTRTABSIZE 32 +#define MINSTRTABSIZE 128 +#endif + + +/* +** Size of cache for strings in the API. 'N' is the number of +** sets (better be a prime) and "M" is the size of each set (M == 1 +** makes a direct cache.) +*/ +#if !defined(STRCACHE_N) +#define STRCACHE_N 53 +#define STRCACHE_M 2 #endif @@ -151,13 +206,21 @@ typedef lu_int32 Instruction; #endif +/* +** macros that are executed whenever program enters the Lua core +** ('lua_lock') and leaves the core ('lua_unlock') +*/ #if !defined(lua_lock) -#define lua_lock(L) ((void) 0) -#define lua_unlock(L) ((void) 0) +#define lua_lock(L) ((void) 0) +#define lua_unlock(L) ((void) 0) #endif +/* +** macro executed during Lua functions at points where the +** function can yield. +*/ #if !defined(luai_threadyield) -#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);} +#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);} #endif @@ -183,127 +246,78 @@ typedef lu_int32 Instruction; #endif #if !defined(luai_userstateresume) -#define luai_userstateresume(L,n) ((void)L) +#define luai_userstateresume(L,n) ((void)L) #endif #if !defined(luai_userstateyield) -#define luai_userstateyield(L,n) ((void)L) +#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. -** luai_hashnum is a macro to 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). -*/ - -#if defined(MS_ASMTRICK) || defined(LUA_MSASMTRICK) /* { */ -/* 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 int 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_IEEEENDIANLOC (ieeeendian.l_p[1] == 33) -#else -#define LUA_IEEEENDIANLOC LUA_IEEEENDIAN -#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_IEEEENDIANLOC]; } -#define luai_hashnum(i,n) \ - { volatile union luai_Cast u; u.l_d = (n) + 1.0; /* avoid -0 */ \ - (i) = u.l_p[0]; (i) += u.l_p[1]; } /* add double bits for his hash */ - -#define lua_number2int(i,n) lua_number2int32(i, n, int) -#define lua_number2unsigned(i,n) lua_number2int32(i, n, lua_Unsigned) +/* +** The luai_num* macros define the primitive operations over numbers. +*/ -/* the trick can be expanded to lua_Integer when it is a 32-bit value */ -#if defined(LUA_IEEELL) -#define lua_number2integer(i,n) lua_number2int32(i, n, lua_Integer) +/* floor division (defined as 'floor(a/b)') */ +#if !defined(luai_numidiv) +#define luai_numidiv(L,a,b) ((void)L, l_floor(luai_numdiv(L,a,b))) #endif -#endif /* } */ - - -/* the following definitions always work, but may be slow */ - -#if !defined(lua_number2int) -#define lua_number2int(i,n) ((i)=(int)(n)) +/* float division */ +#if !defined(luai_numdiv) +#define luai_numdiv(L,a,b) ((a)/(b)) #endif -#if !defined(lua_number2integer) -#define lua_number2integer(i,n) ((i)=(lua_Integer)(n)) +/* +** modulo: defined as 'a - floor(a/b)*b'; this definition gives NaN when +** 'b' is huge, but the result should be 'a'. 'fmod' gives the result of +** 'a - trunc(a/b)*b', and therefore must be corrected when 'trunc(a/b) +** ~= floor(a/b)'. That happens when the division has a non-integer +** negative result, which is equivalent to the test below. +*/ +#if !defined(luai_nummod) +#define luai_nummod(L,a,b,m) \ + { (m) = l_mathop(fmod)(a,b); if ((m)*(b) < 0) (m) += (b); } #endif -#if !defined(lua_number2unsigned) /* { */ -/* the following definition assures proper modulo behavior */ -#if defined(LUA_NUMBER_DOUBLE) || defined(LUA_NUMBER_FLOAT) -#include <math.h> -#define SUPUNSIGNED ((lua_Number)(~(lua_Unsigned)0) + 1) -#define lua_number2unsigned(i,n) \ - ((i)=(lua_Unsigned)((n) - floor((n)/SUPUNSIGNED)*SUPUNSIGNED)) -#else -#define lua_number2unsigned(i,n) ((i)=(lua_Unsigned)(n)) +/* exponentiation */ +#if !defined(luai_numpow) +#define luai_numpow(L,a,b) ((void)L, l_mathop(pow)(a,b)) #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) \ - (((u) <= (lua_Unsigned)INT_MAX) ? (lua_Number)(int)(u) : (lua_Number)(u)) +/* the others are quite standard operations */ +#if !defined(luai_numadd) +#define luai_numadd(L,a,b) ((a)+(b)) +#define luai_numsub(L,a,b) ((a)-(b)) +#define luai_nummul(L,a,b) ((a)*(b)) +#define luai_numunm(L,a) (-(a)) +#define luai_numeq(a,b) ((a)==(b)) +#define luai_numlt(a,b) ((a)<(b)) +#define luai_numle(a,b) ((a)<=(b)) +#define luai_numisnan(a) (!luai_numeq((a), (a))) #endif -#if defined(ltable_c) && !defined(luai_hashnum) - -#include <float.h> -#include <math.h> - -#define luai_hashnum(i,n) { int e; \ - n = l_mathop(frexp)(n, &e) * (lua_Number)(INT_MAX - DBL_MAX_EXP); \ - lua_number2int(i, n); i += e; } - -#endif - /* ** macro to control inclusion of some hard tests on stack reallocation */ #if !defined(HARDSTACKTESTS) -#define condmovestack(L) ((void)0) +#define condmovestack(L,pre,pos) ((void)0) #else /* realloc stack keeping its size */ -#define condmovestack(L) luaD_reallocstack((L), (L)->stacksize) +#define condmovestack(L,pre,pos) \ + { int sz_ = (L)->stacksize; pre; luaD_reallocstack((L), sz_); pos; } #endif #if !defined(HARDMEMTESTS) -#define condchangemem(L) condmovestack(L) +#define condchangemem(L,pre,pos) ((void)0) #else -#define condchangemem(L) \ - ((void)(!(G(L)->gcrunning) || (luaC_fullgc(L, 0), 1))) +#define condchangemem(L,pre,pos) \ + { if (G(L)->gcrunning) { pre; luaC_fullgc(L, 0); pos; } } #endif #endif |