fixes #2472 (Update liblua to 5.4)

1 files changed, 67 insertions, 41 deletions

diff --git a/libs/liblua/src/llimits.h b/libs/liblua/src/llimits.h
index d1036f6bc8..b86d345256 100644
--- a/libs/liblua/src/llimits.h
+++ b/libs/liblua/src/llimits.h
@@ -1,5 +1,5 @@
 /*
-** $Id: llimits.h,v 1.141.1.1 2017/04/19 17:20:42 roberto Exp $
+** $Id: llimits.h $
 ** Limits, basic types, and some other 'installation-dependent' definitions
 ** See Copyright Notice in lua.h
 */
@@ -14,6 +14,7 @@
 
 #include "lua.h"
 
+
 /*
 ** '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
@@ -22,7 +23,7 @@
 #if defined(LUAI_MEM)		/* { external definitions? */
 typedef LUAI_UMEM lu_mem;
 typedef LUAI_MEM l_mem;
-#elif LUAI_BITSINT >= 32	/* }{ */
+#elif LUAI_IS32INT	/* }{ */
 typedef size_t lu_mem;
 typedef ptrdiff_t l_mem;
 #else  /* 16-bit ints */	/* }{ */
@@ -33,12 +34,13 @@ typedef long l_mem;
 
 /* chars used as small naturals (so that 'char' is reserved for characters) */
 typedef unsigned char lu_byte;
+typedef signed char ls_byte;
 
 
 /* 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 */
+/* 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))
 
@@ -52,6 +54,23 @@ typedef unsigned char lu_byte;
 
 
 /*
+** floor of the log2 of the maximum signed value for integral type 't'.
+** (That is, maximum 'n' such that '2^n' fits in the given signed type.)
+*/
+#define log2maxs(t)	(sizeof(t) * 8 - 2)
+
+
+/*
+** test whether an unsigned value is a power of 2 (or zero)
+*/
+#define ispow2(x)	(((x) & ((x) - 1)) == 0)
+
+
+/* number of chars of a literal string without the ending \0 */
+#define LL(x)   (sizeof(x)/sizeof(char) - 1)
+
+
+/*
 ** conversion of pointer to unsigned integer:
 ** this is for hashing only; there is no problem if the integer
 ** cannot hold the whole pointer value
@@ -60,21 +79,6 @@ typedef unsigned char lu_byte;
 
 
 
-/* type to ensure maximum alignment */
-#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
-
-
-
 /* types of 'usual argument conversions' for lua_Number and lua_Integer */
 typedef LUAI_UACNUMBER l_uacNumber;
 typedef LUAI_UACINT l_uacInt;
@@ -95,7 +99,7 @@ typedef LUAI_UACINT l_uacInt;
 ** assertion for checking API calls
 */
 #if !defined(luai_apicheck)
-#define luai_apicheck(l,e)	lua_assert(e)
+#define luai_apicheck(l,e)	((void)l, lua_assert(e))
 #endif
 
 #define api_check(l,e,msg)	luai_apicheck(l,(e) && msg)
@@ -111,10 +115,15 @@ typedef LUAI_UACINT l_uacInt;
 #define cast(t, exp)	((t)(exp))
 
 #define cast_void(i)	cast(void, (i))
-#define cast_byte(i)	cast(lu_byte, (i))
+#define cast_voidp(i)	cast(void *, (i))
 #define cast_num(i)	cast(lua_Number, (i))
 #define cast_int(i)	cast(int, (i))
+#define cast_uint(i)	cast(unsigned int, (i))
+#define cast_byte(i)	cast(lu_byte, (i))
 #define cast_uchar(i)	cast(unsigned char, (i))
+#define cast_char(i)	cast(char, (i))
+#define cast_charp(i)	cast(char *, (i))
+#define cast_sizet(i)	cast(size_t, (i))
 
 
 /* cast a signed lua_Integer to lua_Unsigned */
@@ -133,38 +142,49 @@ typedef LUAI_UACINT l_uacInt;
 
 
 /*
-** non-return type
+** macros to improve jump prediction (used mainly for error handling)
 */
+#if !defined(likely)
+
 #if defined(__GNUC__)
-#define l_noret		void __attribute__((noreturn))
-#elif defined(_MSC_VER) && _MSC_VER >= 1200
-#define l_noret		void __declspec(noreturn)
+#define likely(x)	(__builtin_expect(((x) != 0), 1))
+#define unlikely(x)	(__builtin_expect(((x) != 0), 0))
 #else
-#define l_noret		void
+#define likely(x)	(x)
+#define unlikely(x)	(x)
 #endif
 
+#endif
 
 
 /*
-** maximum depth for nested C calls and syntactical nested non-terminals
-** in a program. (Value must fit in an unsigned short int.)
+** non-return type
 */
-#if !defined(LUAI_MAXCCALLS)
-#define LUAI_MAXCCALLS		200
+#if !defined(l_noret)
+
+#if defined(__GNUC__)
+#define l_noret		void __attribute__((noreturn))
+#elif defined(_MSC_VER) && _MSC_VER >= 1200
+#define l_noret		void __declspec(noreturn)
+#else
+#define l_noret		void
 #endif
 
+#endif
 
 
 /*
 ** type for virtual-machine instructions;
 ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
 */
-#if LUAI_BITSINT >= 32
-typedef unsigned int Instruction;
+#if LUAI_IS32INT
+typedef unsigned int l_uint32;
 #else
-typedef unsigned long Instruction;
+typedef unsigned long l_uint32;
 #endif
 
+typedef l_uint32 Instruction;
+
 
 
 /*
@@ -225,8 +245,7 @@ typedef unsigned long Instruction;
 
 
 /*
-** these macros allow user-specific actions on threads when you defined
-** LUAI_EXTRASPACE and need to do something extra when a thread is
+** these macros allow user-specific actions when a thread is
 ** created/deleted/resumed/yielded.
 */
 #if !defined(luai_userstateopen)
@@ -270,15 +289,20 @@ typedef unsigned long Instruction;
 #endif
 
 /*
-** 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.
+** modulo: defined as 'a - floor(a/b)*b'; the direct computation
+** using this definition has several problems with rounding errors,
+** so it is better to use 'fmod'. '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: non-integer result is equivalent to
+** a non-zero remainder 'm'; negative result is equivalent to 'a' and
+** 'b' with different signs, or 'm' and 'b' with different signs
+** (as the result 'm' of 'fmod' has the same sign of 'a').
 */
 #if !defined(luai_nummod)
 #define luai_nummod(L,a,b,m)  \
-  { (m) = l_mathop(fmod)(a,b); if ((m)*(b) < 0) (m) += (b); }
+  { (void)L; (m) = l_mathop(fmod)(a,b); \
+    if (((m) > 0) ? (b) < 0 : ((m) < 0 && (b) > 0)) (m) += (b); }
 #endif
 
 /* exponentiation */
@@ -295,6 +319,8 @@ typedef unsigned long Instruction;
 #define luai_numeq(a,b)         ((a)==(b))
 #define luai_numlt(a,b)         ((a)<(b))
 #define luai_numle(a,b)         ((a)<=(b))
+#define luai_numgt(a,b)         ((a)>(b))
+#define luai_numge(a,b)         ((a)>=(b))
 #define luai_numisnan(a)        (!luai_numeq((a), (a)))
 #endif
 
@@ -310,7 +336,7 @@ typedef unsigned long Instruction;
 #else
 /* realloc stack keeping its size */
 #define condmovestack(L,pre,pos)  \
-	{ int sz_ = (L)->stacksize; pre; luaD_reallocstack((L), sz_); pos; }
+  { int sz_ = (L)->stacksize; pre; luaD_reallocstack((L), sz_, 0); pos; }
 #endif
 
 #if !defined(HARDMEMTESTS)