Cleanup architecture, ABI and OS definitions.

19 files changed, 113 insertions, 72 deletions

diff --git a/src/Makefile b/src/Makefile
index bae6691e..da9f67b2 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -336,7 +336,7 @@ ifeq (Windows,$(TARGET_SYS))
   LUAJIT_SO= $(TARGET_DLLNAME)
   LUAJIT_T= luajit.exe
   ifneq ($(HOST_SYS),$(TARGET_SYS))
-    HOST_XCFLAGS+= -malign-double
+    HOST_XCFLAGS+= -malign-double -DLUAJIT_OS=LUAJIT_OS_WINDOWS
   endif
   # Mixed mode is not supported on Windows. And static mode doesn't work well.
   # C modules cannot be loaded, because they bind to lua51.dll.
diff --git a/src/buildvm.c b/src/buildvm.c
index 382550b8..72e612c1 100644
--- a/src/buildvm.c
+++ b/src/buildvm.c
@@ -23,7 +23,7 @@
 #include "lj_dispatch.h"
 #include "luajit.h"
 
-#ifdef LUA_USE_WIN
+#if defined(_WIN32)
 #include <fcntl.h>
 #include <io.h>
 #endif
@@ -64,11 +64,12 @@ static int collect_reloc(BuildCtx *ctx, uint8_t *addr, int idx, int type);
 #define DASM_ALIGNED_WRITES     1
 
 /* Embed architecture-specific DynASM encoder and backend. */
-#if LJ_TARGET_X86ORX64
+#if LJ_TARGET_X86
 #include "../dynasm/dasm_x86.h"
-#if LJ_32
 #include "buildvm_x86.h"
-#elif defined(_WIN64)
+#elif LJ_TARGET_X64
+#include "../dynasm/dasm_x86.h"
+#if LJ_ABI_WIN
 #include "buildvm_x64win.h"
 #else
 #include "buildvm_x64.h"
@@ -449,7 +450,7 @@ int main(int argc, char **argv)
 
   if (ctx->outname[0] == '-' && ctx->outname[1] == '\0') {
     ctx->fp = stdout;
-#ifdef LUA_USE_WIN
+#if defined(_WIN32)
     if (binmode)
       _setmode(_fileno(stdout), _O_BINARY);  /* Yuck. */
 #endif
diff --git a/src/lib_io.c b/src/lib_io.c
index 787fdc6b..878b98af 100644
--- a/src/lib_io.c
+++ b/src/lib_io.c
@@ -114,9 +114,9 @@ static int io_file_close(lua_State *L, IOFileUD *iof)
   if ((iof->type & IOFILE_TYPE_MASK) == IOFILE_TYPE_FILE) {
     ok = (fclose(iof->fp) == 0);
   } else if ((iof->type & IOFILE_TYPE_MASK) == IOFILE_TYPE_PIPE) {
-#if defined(LUA_USE_POSIX)
+#if LJ_TARGET_POSIX
     ok = (pclose(iof->fp) != -1);
-#elif defined(LUA_USE_WIN)
+#elif LJ_TARGET_WINDOWS
     ok = (_pclose(iof->fp) != -1);
 #else
     ok = 0;
@@ -289,7 +289,7 @@ LJLIB_CF(io_method_seek)
     ,
     ofs = 0;
   )
-#if defined(LUA_USE_POSIX)
+#if LJ_TARGET_POSIX
   res = fseeko(fp, (int64_t)ofs, opt);
 #elif _MSC_VER >= 1400
   res = _fseeki64(fp, (int64_t)ofs, opt);
@@ -300,7 +300,7 @@ LJLIB_CF(io_method_seek)
 #endif
   if (res)
     return io_pushresult(L, 0, NULL);
-#if defined(LUA_USE_POSIX)
+#if LJ_TARGET_POSIX
   ofs = cast_num(ftello(fp));
 #elif _MSC_VER >= 1400
   ofs = cast_num(_ftelli64(fp));
@@ -374,13 +374,13 @@ LJLIB_CF(io_open)
 
 LJLIB_CF(io_popen)
 {
-#if defined(LUA_USE_POSIX) || defined(LUA_USE_WIN)
+#if LJ_TARGET_POSIX || LJ_TARGET_WINDOWS
   const char *fname = strdata(lj_lib_checkstr(L, 1));
   GCstr *s = lj_lib_optstr(L, 2);
   const char *mode = s ? strdata(s) : "r";
   IOFileUD *iof = io_file_new(L);
   iof->type = IOFILE_TYPE_PIPE;
-#ifdef LUA_USE_POSIX
+#if LJ_TARGET_POSIX
   fflush(NULL);
   iof->fp = popen(fname, mode);
 #else
diff --git a/src/lib_os.c b/src/lib_os.c
index 8f08616f..690bffe8 100644
--- a/src/lib_os.c
+++ b/src/lib_os.c
@@ -17,16 +17,16 @@
 #include "lauxlib.h"
 #include "lualib.h"
 
-#ifdef LUA_USE_POSIX
+#include "lj_obj.h"
+#include "lj_err.h"
+#include "lj_lib.h"
+
+#if LJ_TARGET_POSIX
 #include <unistd.h>
 #else
 #include <stdio.h>
 #endif
 
-#include "lj_obj.h"
-#include "lj_err.h"
-#include "lj_lib.h"
-
 /* ------------------------------------------------------------------------ */
 
 #define LJLIB_MODULE_os
@@ -66,7 +66,7 @@ LJLIB_CF(os_rename)
 
 LJLIB_CF(os_tmpname)
 {
-#ifdef LUA_USE_POSIX
+#if LJ_TARGET_POSIX
   char buf[15+1];
   int fp;
   strcpy(buf, "/tmp/lua_XXXXXX");
diff --git a/src/lib_package.c b/src/lib_package.c
index 5678ca4a..1757a944 100644
--- a/src/lib_package.c
+++ b/src/lib_package.c
@@ -27,7 +27,7 @@
 #define PACKAGE_LIB_FAIL        "open"
 #define setprogdir(L)           ((void)0)
 
-#if defined(LUA_DL_DLOPEN)
+#if LJ_TARGET_DLOPEN
 
 #include <dlfcn.h>
 
@@ -50,7 +50,7 @@ static lua_CFunction ll_sym(lua_State *L, void *lib, const char *sym)
   return f;
 }
 
-#elif defined(LUA_DL_DLL)
+#elif LJ_TARGET_WINDOWS
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
@@ -107,7 +107,7 @@ static lua_CFunction ll_sym(lua_State *L, void *lib, const char *sym)
 #undef PACKAGE_LIB_FAIL
 #define PACKAGE_LIB_FAIL        "absent"
 
-#define DLMSG   "dynamic libraries not enabled; check your Lua installation"
+#define DLMSG   "dynamic libraries not enabled; no support for target OS"
 
 static void ll_unloadlib(void *lib)
 {
diff --git a/src/lj_alloc.c b/src/lj_alloc.c
index 2c686597..2f3fb473 100644
--- a/src/lj_alloc.c
+++ b/src/lj_alloc.c
@@ -72,7 +72,7 @@
 
 #define IS_DIRECT_BIT           (SIZE_T_ONE)
 
-#ifdef LUA_USE_WIN
+#if LJ_TARGET_WINDOWS
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
@@ -166,13 +166,12 @@ static LJ_AINLINE int CALL_MUNMAP(void *ptr, size_t size)
 #if LJ_64
 /* 64 bit mode needs special support for allocating memory in the lower 2GB. */
 
-#if defined(__linux__)
+#if LJ_TARGET_LINUX
 
 /* Actually this only gives us max. 1GB in current Linux kernels. */
 #define CALL_MMAP(s)    mmap(NULL, (s), MMAP_PROT, MAP_32BIT|MMAP_FLAGS, -1, 0)
 
-#elif (defined(__MACH__) && defined(__APPLE__)) || \
-      defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#elif LJ_TARGET_OSX || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 
 /* OSX and FreeBSD mmap() use a naive first-fit linear search.
 ** That's perfect for us. Except that -pagezero_size must be set for OSX,
@@ -233,7 +232,7 @@ static LJ_AINLINE void *CALL_MMAP(size_t size)
 #define DIRECT_MMAP(s)          CALL_MMAP(s)
 #define CALL_MUNMAP(a, s)       munmap((a), (s))
 
-#ifdef __linux__
+#if LJ_TARGET_LINUX
 /* Need to define _GNU_SOURCE to get the mremap prototype. */
 #define CALL_MREMAP(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv))
 #define CALL_MREMAP_NOMOVE      0
@@ -420,7 +419,7 @@ typedef struct malloc_state *mstate;
   (((S) + (DEFAULT_GRANULARITY - SIZE_T_ONE))\
    & ~(DEFAULT_GRANULARITY - SIZE_T_ONE))
 
-#ifdef LUA_USE_WIN
+#if LJ_TARGET_WINDOWS
 #define mmap_align(S)   granularity_align(S)
 #else
 #define mmap_align(S)   page_align(S)
diff --git a/src/lj_arch.h b/src/lj_arch.h
index 7f1fe93c..f9cb12e7 100644
--- a/src/lj_arch.h
+++ b/src/lj_arch.h
@@ -8,7 +8,6 @@
 
 #include "lua.h"
 
-
 /* Target endianess. */
 #define LUAJIT_LE       0
 #define LUAJIT_BE       1
@@ -23,6 +22,13 @@
 #define LUAJIT_ARCH_PPCSPE      4
 #define LUAJIT_ARCH_ppcspe      4
 
+/* Target OS. */
+#define LUAJIT_OS_OTHER         0
+#define LUAJIT_OS_WINDOWS       1
+#define LUAJIT_OS_LINUX         2
+#define LUAJIT_OS_OSX           3
+#define LUAJIT_OS_BSD           4
+#define LUAJIT_OS_POSIX         5
 
 /* Select native target if no target defined. */
 #ifndef LUAJIT_TARGET
@@ -43,15 +49,58 @@
 
 #endif
 
-/* Set target properties. */
+/* Select native OS if no target OS defined. */
+#ifndef LUAJIT_OS
+
+#if defined(_WIN32)
+#define LUAJIT_OS       LUAJIT_OS_WINDOWS
+#elif defined(__linux__)
+#define LUAJIT_OS       LUAJIT_OS_LINUX
+#elif defined(__MACH__) && defined(__APPLE__)
+#define LUAJIT_OS       LUAJIT_OS_OSX
+#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
+      defined(__NetBSD__) || defined(__OpenBSD__)
+#define LUAJIT_OS       LUAJIT_OS_BSD
+#elif defined(__solaris__) || defined(__CYGWIN__)
+#define LUAJIT_OS       LUAJIT_OS_POSIX
+#else
+#define LUAJIT_OS       LUAJIT_OS_OTHER
+#endif
+
+#endif
+
+/* Set target OS properties. */
+#if LUAJIT_OS == LUAJIT_OS_WINDOWS
+#define LJ_OS_NAME      "Windows"
+#elif LUAJIT_OS == LUAJIT_OS_LINUX
+#define LJ_OS_NAME      "Linux"
+#elif LUAJIT_OS == LUAJIT_OS_OSX
+#define LJ_OS_NAME      "OSX"
+#elif LUAJIT_OS == LUAJIT_OS_BSD
+#define LJ_OS_NAME      "BSD"
+#elif LUAJIT_OS == LUAJIT_OS_POSIX
+#define LJ_OS_NAME      "Posix"
+#else
+#define LJ_OS_NAME      "Other"
+#endif
+
+#define LJ_TARGET_WINDOWS       (LUAJIT_OS == LUAJIT_OS_WINDOWS)
+#define LJ_TARGET_LINUX         (LUAJIT_OS == LUAJIT_OS_LINUX)
+#define LJ_TARGET_OSX           (LUAJIT_OS == LUAJIT_OS_OSX)
+#define LJ_TARGET_POSIX         (LUAJIT_OS > LUAJIT_OS_WINDOWS)
+#define LJ_TARGET_DLOPEN        LJ_TARGET_POSIX
+
+/* Set target architecture properties. */
 #if LUAJIT_TARGET == LUAJIT_ARCH_X86
 
 #define LJ_ARCH_NAME            "x86"
 #define LJ_ARCH_BITS            32
 #define LJ_ARCH_ENDIAN          LUAJIT_LE
+#define LJ_ARCH_BITENDIAN       LUAJIT_LE
+#define LJ_ARCH_HASFPU          1
+#define LJ_ABI_WIN              LJ_TARGET_WINDOWS
 #define LJ_TARGET_X86           1
 #define LJ_TARGET_X86ORX64      1
-#define LJ_PAGESIZE             4096
 #define LJ_TARGET_EHRETREG      0
 #define LJ_TARGET_MASKSHIFT     1
 #define LJ_TARGET_MASKROT       1
@@ -61,9 +110,11 @@
 #define LJ_ARCH_NAME            "x64"
 #define LJ_ARCH_BITS            64
 #define LJ_ARCH_ENDIAN          LUAJIT_LE
+#define LJ_ARCH_BITENDIAN       LUAJIT_LE
+#define LJ_ARCH_HASFPU          1
+#define LJ_ABI_WIN              LJ_TARGET_WINDOWS
 #define LJ_TARGET_X64           1
 #define LJ_TARGET_X86ORX64      1
-#define LJ_PAGESIZE             4096
 #define LJ_TARGET_EHRETREG      0
 #define LJ_TARGET_MASKSHIFT     1
 #define LJ_TARGET_MASKROT       1
@@ -77,9 +128,12 @@
 #define LJ_ARCH_NAME            "ppcspe"
 #define LJ_ARCH_BITS            32
 #define LJ_ARCH_ENDIAN          LUAJIT_BE
+#define LJ_ARCH_BITENDIAN       LUAJIT_BE
+#define LJ_ARCH_HASFPU          1
+#define LJ_ABI_SOFTFP           1
+#define LJ_ABI_EABI             1
 #define LJ_TARGET_PPC           1
 #define LJ_TARGET_PPCSPE        1
-#define LJ_PAGESIZE             4096
 #define LJ_TARGET_EHRETREG      3
 #define LJ_TARGET_MASKSHIFT     0
 #define LJ_TARGET_MASKROT       1
@@ -89,6 +143,10 @@
 #error "No target architecture defined"
 #endif
 
+#ifndef LJ_PAGESIZE
+#define LJ_PAGESIZE             4096
+#endif
+
 /* Check for minimum required compiler versions. */
 #if defined(__GNUC__)
 #if LJ_TARGET_X64
diff --git a/src/lj_asm.c b/src/lj_asm.c
index 322799e6..80dda36a 100644
--- a/src/lj_asm.c
+++ b/src/lj_asm.c
@@ -1345,7 +1345,7 @@ static void asm_gencall(ASMState *as, const CCallInfo *ci, IRRef *args)
   for (n = 0; n < nargs; n++) {  /* Setup args. */
     IRIns *ir = IR(args[n]);
     Reg r;
-#if LJ_64 && defined(_WIN64)
+#if LJ_64 && LJ_ABI_WIN
     /* Windows/x64 argument registers are strictly positional. */
     r = irt_isnum(ir->t) ? (fpr <= REGARG_LASTFPR ? fpr : 0) : (gprs & 31);
     fpr++; gprs >>= 5;
@@ -3518,11 +3518,7 @@ static void asm_setup_regsp(ASMState *as, GCtrace *T)
       const CCallInfo *ci = &lj_ir_callinfo[ir->op2];
 #if LJ_64
       /* NYI: add stack slots for x64 calls with many args. */
-#ifdef _WIN64
-      lua_assert(CCI_NARGS(ci) <= 4);
-#else
-      lua_assert(CCI_NARGS(ci) <= 6);  /* Safe lower bound. */
-#endif
+      lua_assert(CCI_NARGS(ci) <= (LJ_ABI_WIN ? 4 : 6));
       ir->prev = REGSP_HINT(irt_isnum(ir->t) ? RID_FPRET : RID_RET);
 #else
       /* NYI: not fastcall-aware, but doesn't matter (yet). */
diff --git a/src/lj_err.c b/src/lj_err.c
index 5a6aac83..8a80c9c8 100644
--- a/src/lj_err.c
+++ b/src/lj_err.c
@@ -63,15 +63,11 @@
 ** EXT is mandatory on POSIX/x64 since the interpreter doesn't save r12/r13.
 */
 
-#if defined(__GNUC__)
-#if LJ_TARGET_X64 || defined(LUAJIT_UNWIND_EXTERNAL)
+#if defined(__GNUC__) && (LJ_TARGET_X64 || defined(LUAJIT_UNWIND_EXTERNAL))
 #define LJ_UNWIND_EXT   1
-#endif
-#elif defined(LUA_USE_WIN)
-#if LJ_TARGET_X64
+#elif LJ_TARGET_X64 && LJ_TARGET_WINDOWS
 #define LJ_UNWIND_EXT   1
 #endif
-#endif
 
 /* -- Error messages ------------------------------------------------------ */
 
@@ -604,7 +600,7 @@ static void err_raise_ext(int errcode)
 }
 #endif
 
-#elif defined(_WIN64)
+#elif LJ_TARGET_X64 && LJ_TARGET_WINDOWS
 
 /*
 ** Someone in Redmond owes me several days of my life. A lot of this is
diff --git a/src/lj_errmsg.h b/src/lj_errmsg.h
index 4891b74e..4fe8e1b1 100644
--- a/src/lj_errmsg.h
+++ b/src/lj_errmsg.h
@@ -57,7 +57,7 @@ ERRDEF(NOENV,	"no calling environment")
 ERRDEF(CYIELD,  "attempt to yield across C-call boundary")
 ERRDEF(BADLU,   "bad light userdata pointer")
 ERRDEF(NOGCMM,  "bad action while in __gc metamethod")
-#ifdef LUA_USE_WIN
+#if LJ_TARGET_WINDOWS
 ERRDEF(BADFPU,  "bad FPU precision (use D3DCREATE_FPU_PRESERVE with DirectX)")
 #endif
 
diff --git a/src/lj_frame.h b/src/lj_frame.h
index c4931072..143a6812 100644
--- a/src/lj_frame.h
+++ b/src/lj_frame.h
@@ -69,7 +69,7 @@ enum {
 #define CFRAME_SIZE_JIT         CFRAME_SIZE
 #define CFRAME_SHIFT_MULTRES    0
 #elif LJ_TARGET_X64
-#if _WIN64
+#if LJ_ABI_WIN
 #define CFRAME_OFS_PREV         (13*8)
 #define CFRAME_OFS_PC           (25*4)
 #define CFRAME_OFS_L            (24*4)
diff --git a/src/lj_gdbjit.c b/src/lj_gdbjit.c
index 30aab774..d106bb5d 100644
--- a/src/lj_gdbjit.c
+++ b/src/lj_gdbjit.c
@@ -335,7 +335,7 @@ static const ELFheader elfhdr_template = {
   .eclass = LJ_64 ? 2 : 1,
   .eendian = LJ_ENDIAN_SELECT(1, 2),
   .eversion = 1,
-#if defined(__linux__)
+#if LJ_TARGET_LINUX
   .eosabi = 0,  /* Nope, it's not 3. */
 #elif defined(__FreeBSD__)
   .eosabi = 9,
diff --git a/src/lj_jit.h b/src/lj_jit.h
index 77377931..d309f828 100644
--- a/src/lj_jit.h
+++ b/src/lj_jit.h
@@ -55,7 +55,7 @@
   (JIT_F_OPT_2|JIT_F_OPT_FWD|JIT_F_OPT_DSE|JIT_F_OPT_ABC|JIT_F_OPT_FUSE)
 #define JIT_F_OPT_DEFAULT       JIT_F_OPT_3
 
-#if defined(LUA_USE_WIN) || LJ_64
+#if LJ_TARGET_WINDOWS || LJ_64
 /* See: http://blogs.msdn.com/oldnewthing/archive/2003/10/08/55239.aspx */
 #define JIT_P_sizemcode_DEFAULT         64
 #else
diff --git a/src/lj_lib.h b/src/lj_lib.h
index 814c9739..6782e725 100644
--- a/src/lj_lib.h
+++ b/src/lj_lib.h
@@ -49,7 +49,7 @@ LJ_FUNC int lj_lib_checkopt(lua_State *L, int narg, int def, const char *lst);
 #define lj_lib_upvalue(L, n) \
   (&gcref((L->base-1)->fr.func)->fn.c.upvalue[(n)-1])
 
-#ifdef LUA_USE_WIN
+#if LJ_TARGET_WINDOWS
 #define lj_lib_checkfpu(L) \
   do { setnumV(L->top++, (lua_Number)1437217655); \
     if (lua_tointeger(L, -1) != 1437217655) lj_err_caller(L, LJ_ERR_BADFPU); \
diff --git a/src/lj_mcode.c b/src/lj_mcode.c
index 9b1cae00..72002175 100644
--- a/src/lj_mcode.c
+++ b/src/lj_mcode.c
@@ -19,7 +19,7 @@
 
 /* -- OS-specific functions ----------------------------------------------- */
 
-#if defined(LUA_USE_WIN)
+#if LJ_TARGET_WINDOWS
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
@@ -49,7 +49,7 @@ static void mcode_setprot(void *p, size_t sz, DWORD prot)
   VirtualProtect(p, sz, prot, &oprot);
 }
 
-#elif defined(LUA_USE_POSIX)
+#elif LJ_TARGET_POSIX
 
 #include <sys/mman.h>
 
@@ -82,7 +82,7 @@ static void mcode_setprot(void *p, size_t sz, int prot)
 
 #elif LJ_64
 
-#error "Missing OS support for allocating executable memory"
+#error "Missing OS support for explicit placement of executable memory"
 
 #else
 
diff --git a/src/lj_obj.h b/src/lj_obj.h
index 4baa62d8..c7b653f3 100644
--- a/src/lj_obj.h
+++ b/src/lj_obj.h
@@ -719,7 +719,7 @@ static LJ_AINLINE int32_t lj_num2bit(lua_Number n)
   return (int32_t)o.u32.lo;
 }
 
-#if (defined(__i386__) || defined(_M_IX86)) && !defined(__SSE2__)
+#if LJ_TARGET_X86 && !defined(__SSE2__)
 #define lj_num2int(n)   lj_num2bit((n))
 #else
 #define lj_num2int(n)   ((int32_t)(n))
diff --git a/src/lj_target_x86.h b/src/lj_target_x86.h
index ad4e3d1a..03c52770 100644
--- a/src/lj_target_x86.h
+++ b/src/lj_target_x86.h
@@ -40,7 +40,7 @@ enum {
 
   /* These definitions must match with the *.dasc file(s): */
   RID_BASE = RID_EDX,           /* Interpreter BASE. */
-#if LJ_64 && !defined(_WIN64)
+#if LJ_64 && !LJ_ABI_WIN
   RID_PC = RID_EBX,             /* Interpreter PC. */
   RID_DISPATCH = RID_R14D,      /* Interpreter DISPATCH table. */
 #else
@@ -74,7 +74,7 @@ enum {
 /* ABI-specific register sets. */
 #define RSET_ACD        (RID2RSET(RID_EAX)|RID2RSET(RID_ECX)|RID2RSET(RID_EDX))
 #if LJ_64
-#ifdef _WIN64
+#if LJ_ABI_WIN
 /* Windows x64 ABI. */
 #define RSET_SCRATCH \
   (RSET_ACD|RSET_RANGE(RID_R8D, RID_R11D+1)|RSET_RANGE(RID_XMM0, RID_XMM5+1))
@@ -117,7 +117,7 @@ enum {
 ** SPS_FIRST: First spill slot for general use. Reserve min. two 32 bit slots.
 */
 #if LJ_64
-#ifdef _WIN64
+#if LJ_ABI_WIN
 #define SPS_FIXED       (4*2)
 #define SPS_FIRST       (4*2)   /* Don't use callee register save area. */
 #else
diff --git a/src/luaconf.h b/src/luaconf.h
index 4506b5fb..7278b3ef 100644
--- a/src/luaconf.h
+++ b/src/luaconf.h
@@ -9,19 +9,8 @@
 #include <limits.h>
 #include <stddef.h>
 
-/* Try to determine supported features for a couple of standard platforms. */
-#if defined(_WIN32)
-#define LUA_USE_WIN
-#define LUA_DL_DLL
-#elif defined(__linux__) || defined(__solaris__) || defined(__CYGWIN__) || \
-      defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
-      defined(__FreeBSD_kernel__) || (defined(__MACH__) && defined(__APPLE__))
-#define LUA_USE_POSIX
-#define LUA_DL_DLOPEN
-#endif
-
 /* Default path for loading Lua and C modules with require(). */
-#ifdef LUA_USE_WIN
+#if defined(_WIN32)
 /*
 ** In Windows, any exclamation mark ('!') in the path is replaced by the
 ** path of the directory of the executable file of the current process.
@@ -58,7 +47,7 @@
 #define LUA_INIT        "LUA_INIT"
 
 /* Special file system characters. */
-#ifdef LUA_USE_WIN
+#if defined(_WIN32)
 #define LUA_DIRSEP      "\\"
 #else
 #define LUA_DIRSEP      "/"
diff --git a/src/luajit.c b/src/luajit.c
index e8024479..2e85f01d 100644
--- a/src/luajit.c
+++ b/src/luajit.c
@@ -18,10 +18,12 @@
 #include "lualib.h"
 #include "luajit.h"
 
-#if defined(LUA_USE_POSIX)
+#include "lj_arch.h"
+
+#if LJ_TARGET_POSIX
 #include <unistd.h>
 #define lua_stdin_is_tty()      isatty(0)
-#elif defined(LUA_USE_WIN)
+#elif LJ_TARGET_WINDOWS
 #include <io.h>
 #ifdef __BORLANDC__
 #define lua_stdin_is_tty()      isatty(_fileno(stdin))