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5f8a9e6a02
Use the same reduced buffer size for lauxlib that is used on Linux. Fixes panic on HEAD in lua gsub test designed to exhaust stack space. With this we can remove the special case to reserve more stack space on FreeBSD. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Kyle Evans <kevans@FreeBSD.org> Signed-off-by: Ryan Moeller <ryan@iXsystems.com> Closes #10959
315 lines
7.7 KiB
C
315 lines
7.7 KiB
C
/* BEGIN CSTYLED */
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/*
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** $Id: llimits.h,v 1.103.1.1 2013/04/12 18:48:47 roberto Exp $
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** Limits, basic types, and some other `installation-dependent' definitions
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** See Copyright Notice in lua.h
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*/
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#ifndef llimits_h
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#define llimits_h
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#include <sys/lua/lua.h>
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typedef unsigned LUA_INT32 lu_int32;
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typedef LUAI_UMEM lu_mem;
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typedef LUAI_MEM l_mem;
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/* chars used as small naturals (so that `char' is reserved for characters) */
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typedef unsigned char lu_byte;
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#define MAX_SIZET ((size_t)(~(size_t)0)-2)
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#define MAX_LUMEM ((lu_mem)(~(lu_mem)0)-2)
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#define MAX_LMEM ((l_mem) ((MAX_LUMEM >> 1) - 2))
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#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
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/*
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** conversion of pointer to integer
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** this is for hashing only; there is no problem if the integer
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** cannot hold the whole pointer value
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*/
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#define IntPoint(p) ((unsigned int)(lu_mem)(p))
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/* type to ensure maximum alignment */
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#if !defined(LUAI_USER_ALIGNMENT_T)
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#define LUAI_USER_ALIGNMENT_T union { double u; void *s; long l; }
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#endif
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typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
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/* result of a `usual argument conversion' over lua_Number */
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typedef LUAI_UACNUMBER l_uacNumber;
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/* internal assertions for in-house debugging */
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#if defined(lua_assert)
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#define check_exp(c,e) (lua_assert(c), (e))
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/* to avoid problems with conditions too long */
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#define lua_longassert(c) { if (!(c)) lua_assert(0); }
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#else
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#define lua_assert(c) ((void)0)
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#define check_exp(c,e) (e)
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#define lua_longassert(c) ((void)0)
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#endif
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/*
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** assertion for checking API calls
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*/
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#if !defined(luai_apicheck)
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#if defined(LUA_USE_APICHECK)
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#include <assert.h>
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#define luai_apicheck(L,e) assert(e)
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#else
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#define luai_apicheck(L,e) lua_assert(e)
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#endif
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#endif
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#define api_check(l,e,msg) luai_apicheck(l,(e) && msg)
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#if !defined(UNUSED)
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#define UNUSED(x) ((void)(x)) /* to avoid warnings */
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#endif
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#define cast(t, exp) ((t)(exp))
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#define cast_byte(i) cast(lu_byte, (i))
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#define cast_num(i) cast(lua_Number, (i))
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#define cast_int(i) cast(int, (i))
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#define cast_uchar(i) cast(unsigned char, (i))
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/*
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** non-return type
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**
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** Suppress noreturn attribute in kernel builds to avoid objtool check warnings
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*/
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#if defined(__GNUC__) && !defined(_KERNEL)
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#define l_noret void __attribute__((noreturn))
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#elif defined(_MSC_VER)
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#define l_noret void __declspec(noreturn)
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#else
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#define l_noret void
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#endif
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/*
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** maximum depth for nested C calls and syntactical nested non-terminals
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** in a program. (Value must fit in an unsigned short int.)
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**
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** Note: On amd64 platform, the limit has been measured to be 45. We set
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** the maximum lower to give a margin for changing the amount of stack
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** used by various functions involved in parsing and executing code.
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*/
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#if !defined(LUAI_MAXCCALLS)
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#define LUAI_MAXCCALLS 20
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#endif
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/*
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* Minimum amount of available stack space (in bytes) to make a C call. With
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* gsub() recursion, the stack space between each luaD_call() is 1256 bytes.
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*/
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#define LUAI_MINCSTACK 4096
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/*
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** maximum number of upvalues in a closure (both C and Lua). (Value
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** must fit in an unsigned char.)
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*/
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#define MAXUPVAL UCHAR_MAX
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/*
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** type for virtual-machine instructions
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** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
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*/
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typedef lu_int32 Instruction;
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/* maximum stack for a Lua function */
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#define MAXSTACK 250
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/* minimum size for the string table (must be power of 2) */
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#if !defined(MINSTRTABSIZE)
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#define MINSTRTABSIZE 32
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#endif
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/* minimum size for string buffer */
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#if !defined(LUA_MINBUFFER)
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#define LUA_MINBUFFER 32
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#endif
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#if !defined(lua_lock)
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#define lua_lock(L) ((void) 0)
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#define lua_unlock(L) ((void) 0)
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#endif
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#if !defined(luai_threadyield)
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#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);}
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#endif
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/*
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** these macros allow user-specific actions on threads when you defined
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** LUAI_EXTRASPACE and need to do something extra when a thread is
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** created/deleted/resumed/yielded.
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*/
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#if !defined(luai_userstateopen)
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#define luai_userstateopen(L) ((void)L)
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#endif
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#if !defined(luai_userstateclose)
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#define luai_userstateclose(L) ((void)L)
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#endif
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#if !defined(luai_userstatethread)
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#define luai_userstatethread(L,L1) ((void)L)
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#endif
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#if !defined(luai_userstatefree)
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#define luai_userstatefree(L,L1) ((void)L)
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#endif
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#if !defined(luai_userstateresume)
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#define luai_userstateresume(L,n) ((void)L)
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#endif
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#if !defined(luai_userstateyield)
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#define luai_userstateyield(L,n) ((void)L)
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#endif
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/*
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** lua_number2int is a macro to convert lua_Number to int.
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** lua_number2integer is a macro to convert lua_Number to lua_Integer.
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** lua_number2unsigned is a macro to convert a lua_Number to a lua_Unsigned.
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** lua_unsigned2number is a macro to convert a lua_Unsigned to a lua_Number.
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** luai_hashnum is a macro to hash a lua_Number value into an integer.
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** The hash must be deterministic and give reasonable values for
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** both small and large values (outside the range of integers).
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*/
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#if defined(MS_ASMTRICK) || defined(LUA_MSASMTRICK) /* { */
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/* trick with Microsoft assembler for X86 */
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#define lua_number2int(i,n) __asm {__asm fld n __asm fistp i}
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#define lua_number2integer(i,n) lua_number2int(i, n)
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#define lua_number2unsigned(i,n) \
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{__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;}
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#elif defined(LUA_IEEE754TRICK) /* }{ */
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/* the next trick should work on any machine using IEEE754 with
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a 32-bit int type */
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union luai_Cast { double l_d; LUA_INT32 l_p[2]; };
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#if !defined(LUA_IEEEENDIAN) /* { */
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#define LUAI_EXTRAIEEE \
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static const union luai_Cast ieeeendian = {-(33.0 + 6755399441055744.0)};
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#define LUA_IEEEENDIANLOC (ieeeendian.l_p[1] == 33)
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#else
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#define LUA_IEEEENDIANLOC LUA_IEEEENDIAN
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#define LUAI_EXTRAIEEE /* empty */
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#endif /* } */
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#define lua_number2int32(i,n,t) \
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{ LUAI_EXTRAIEEE \
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volatile union luai_Cast u; u.l_d = (n) + 6755399441055744.0; \
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(i) = (t)u.l_p[LUA_IEEEENDIANLOC]; }
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#define luai_hashnum(i,n) \
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{ volatile union luai_Cast u; u.l_d = (n) + 1.0; /* avoid -0 */ \
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(i) = u.l_p[0]; (i) += u.l_p[1]; } /* add double bits for his hash */
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#define lua_number2int(i,n) lua_number2int32(i, n, int)
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#define lua_number2unsigned(i,n) lua_number2int32(i, n, lua_Unsigned)
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/* the trick can be expanded to lua_Integer when it is a 32-bit value */
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#if defined(LUA_IEEELL)
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#define lua_number2integer(i,n) lua_number2int32(i, n, lua_Integer)
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#endif
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#endif /* } */
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/* the following definitions always work, but may be slow */
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#if !defined(lua_number2int)
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#define lua_number2int(i,n) ((i)=(int)(n))
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#endif
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#if !defined(lua_number2integer)
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#define lua_number2integer(i,n) ((i)=(lua_Integer)(n))
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#endif
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#if !defined(lua_number2unsigned) /* { */
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/* the following definition assures proper modulo behavior */
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#if defined(LUA_NUMBER_DOUBLE) || defined(LUA_NUMBER_FLOAT)
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#include <math.h>
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#define SUPUNSIGNED ((lua_Number)(~(lua_Unsigned)0) + 1)
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#define lua_number2unsigned(i,n) \
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((i)=(lua_Unsigned)((n) - floor((n)/SUPUNSIGNED)*SUPUNSIGNED))
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#else
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#define lua_number2unsigned(i,n) ((i)=(lua_Unsigned)(n))
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#endif
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#endif /* } */
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#if !defined(lua_unsigned2number)
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/* on several machines, coercion from unsigned to double is slow,
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so it may be worth to avoid */
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#define lua_unsigned2number(u) \
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(((u) <= (lua_Unsigned)INT_MAX) ? (lua_Number)(int)(u) : (lua_Number)(u))
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#endif
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#if defined(ltable_c) && !defined(luai_hashnum)
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#define luai_hashnum(i,n) (i = lcompat_hashnum(n))
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#endif
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/*
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** macro to control inclusion of some hard tests on stack reallocation
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*/
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#if !defined(HARDSTACKTESTS)
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#define condmovestack(L) ((void)0)
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#else
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/* realloc stack keeping its size */
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#define condmovestack(L) luaD_reallocstack((L), (L)->stacksize)
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#endif
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#if !defined(HARDMEMTESTS)
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#define condchangemem(L) condmovestack(L)
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#else
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#define condchangemem(L) \
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((void)(!(G(L)->gcrunning) || (luaC_fullgc(L, 0), 1)))
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#endif
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#endif
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/* END CSTYLED */
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