mjit.c: no va_copy

* mjit.c (form_args): do not use va_copy, which cannot detect
  appropriate way to simulate when cross compiling.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62463 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

configure.ac

@@ -1256,24 +1256,6 @@ AS_IF([test "$rb_cv_va_args_macro" = yes], [
   AC_DEFINE(HAVE_VA_ARGS_MACRO)
 ])
 
-AC_CACHE_CHECK([appropriate way to simulate va_copy], rb_cv_va_copy, [dnl
-    RUBY_CHECK_VA_COPY([va_copy], [va_copy((dst),(src))])
-    RUBY_CHECK_VA_COPY([VA_COPY macro], [VA_COPY((dst),(src))])
-    RUBY_CHECK_VA_COPY([__va_copy], [__va_copy((dst),(src))])
-    RUBY_CHECK_VA_COPY([__builtin_va_copy], [__builtin_va_copy((dst),(src))])
-    RUBY_CHECK_VA_COPY([va_copy via struct assignment],
-        [do (dst) = (src); while (0)])
-    RUBY_CHECK_VA_COPY([va_copy via pointer assignment],
-        [do *(dst) = *(src); while (0)])
-    RUBY_CHECK_VA_COPY([va_copy via memcpy],
-        [memcpy(&(dst), &(src), sizeof(va_list))])
-])
-AS_IF([test "x$rb_cv_va_copy" = x], [
-    AC_ERROR([no way to simulate va_copy])
-], [
-    AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$rb_cv_va_copy))
-])
-
 AC_CACHE_CHECK([for alignas() syntax], rb_cv_have_alignas, [
 rb_cv_have_alignas=no
 RUBY_WERROR_FLAG([

internal.h

@@ -85,25 +85,6 @@ extern "C" {
 # define STATIC_ASSERT(name, expr) typedef int static_assert_##name##_check[1 - 2*!(expr)]
 #endif
 
-#if defined(HAVE_VA_COPY)
-/* OK, nothing to do */
-#elif defined(HAVE_VA_COPY_MACRO)
-#define va_copy(dst, src) VA_COPY((dst), (src))
-#elif defined(HAVE___VA_COPY)
-#define va_copy(dst, src) __va_copy((dst), (src))
-#elif defined(HAVE___BUILTIN_VA_COPY)
-#define va_copy(dst, src) __builtin_va_copy((dst), (src))
-#elif defined(HAVE_VA_COPY_VIA_STRUCT_ASSIGNMENT)
-#define va_copy(dst, src) do (dst) = (src); while (0)
-#elif defined(HAVE_VA_COPY_VIA_POINTER_ASSIGNMENT)
-#define va_copy(dst, src) do *(dst) = *(src); while (0)
-#elif defined(HAVE_VA_COPY_VIA_MEMCPY)
-#include <string.h>
-#define va_copy(dst, src) memcpy(&(dst), &(src), sizeof(va_list))
-#else
-#error >>>> no way to simuate va_copy <<<<
-#endif
-
 #define SIGNED_INTEGER_TYPE_P(int_type) (0 > ((int_type)0)-1)
 #define SIGNED_INTEGER_MAX(sint_type) \
   (sint_type) \

mjit.c

@@ -286,27 +286,21 @@ args_len(char *const *args)
 static char **
 form_args(int num, ...)
 {
-    va_list argp, argp2;
+    va_list argp;
-    size_t len, disp;
+    size_t len, n;
     int i;
     char **args, **res;
 
     va_start(argp, num);
-    va_copy(argp2, argp);
+    res = NULL;
     for (i = len = 0; i < num; i++) {
         args = va_arg(argp, char **);
-        len += args_len(args);
+        n = args_len(args);
+        REALLOC_N(res, char *, len + n + 1);
+        MEMCPY(res + len, args, char *, n + 1);
+        len += n;
     }
     va_end(argp);
-    res = xmalloc((len + 1) * sizeof(char *));
-    for (i = disp = 0; i < num; i++) {
-        args = va_arg(argp2, char **);
-        len = args_len(args);
-        memmove(res + disp, args, len * sizeof(char *));
-        disp += len;
-    }
-    res[disp] = NULL;
-    va_end(argp2);
     return res;
 }
 

tool/m4/ruby_check_va_copy.m4

@@ -1,30 +0,0 @@
-# -*- Autoconf -*-
-AC_DEFUN([RUBY_CHECK_VA_COPY], [
-    AS_IF([test "x$rb_cv_va_copy" = x], [dnl
-        AC_TRY_LINK(
-[@%:@include <stdlib.h>
-@%:@include <stdarg.h>
-@%:@include <string.h>
-@%:@define CONFTEST_VA_COPY(dst, src) $2
-void
-conftest(int n, ...)
-{
-    va_list ap, ap2;
-    int i;
-    va_start(ap, n);
-    CONFTEST_VA_COPY(ap2, ap);
-    for (i = 0; i < n; i++) if ((int)va_arg(ap, int) != n - i - 1) abort();
-    va_end(ap);
-    CONFTEST_VA_COPY(ap, ap2);
-    for (i = 0; i < n; i++) if ((int)va_arg(ap, int) != n - i - 1) abort();
-    va_end(ap);
-    va_end(ap2);
-}],
-[
-    conftest(10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
-],
-    [rb_cv_va_copy="$1"],
-    [rb_cv_va_copy=""])dnl
-    ])dnl
-])dnl
-dnl