allow endian specification of mrb files by `mrbc -e/-E`

`mruby -b` now accepts both big/little endian mrb (compiled binary) files.

`mrbc` generates mrb files in big endian for .mrb files and in native endian
for C files (with -B option specified) by default.  If you are cross compiling,
you need to specify target endian by -e/-E options if it is different from
host endian.

1 files changed, 16 insertions, 4 deletions

diff --git a/tools/mrbc/mrbc.c b/tools/mrbc/mrbc.c
index b51cc4da7..f27f87a5d 100644
--- a/tools/mrbc/mrbc.c
+++ b/tools/mrbc/mrbc.c
@@ -18,7 +18,7 @@ struct mrbc_args {
   const char *initname;
   mrb_bool check_syntax : 1;
   mrb_bool verbose      : 1;
-  mrb_bool debug_info   : 1;
+  unsigned int flags    : 4;
 };
 
 static void
@@ -31,6 +31,8 @@ usage(const char *name)
   "-v           print version number, then turn on verbose mode",
   "-g           produce debugging information",
   "-B<symbol>   binary <symbol> output in C language format",
+  "-e           generate little endian iseq data",
+  "-E           generate big endian iseq data",
   "--verbose    run at verbose mode",
   "--version    print the version",
   "--copyright  print the copyright",
@@ -114,7 +116,13 @@ parse_args(mrb_state *mrb, int argc, char **argv, struct mrbc_args *args)
         args->verbose = TRUE;
         break;
       case 'g':
-        args->debug_info = TRUE;
+        args->flags |= DUMP_DEBUG_INFO;
+        break;
+      case 'E':
+        args->flags = DUMP_ENDIAN_BIG | (args->flags & DUMP_DEBUG_INFO);
+        break;
+      case 'e':
+        args->flags = DUMP_ENDIAN_LIL | (args->flags & DUMP_DEBUG_INFO);
         break;
       case 'h':
         return -1;
@@ -143,6 +151,10 @@ parse_args(mrb_state *mrb, int argc, char **argv, struct mrbc_args *args)
       break;
     }
   }
+  if (args->verbose && args->initname && (args->flags & DUMP_ENDIAN_MASK) == 0) {
+    fprintf(stderr, "%s: generating %s endian C file. specify -e/-E for cross compiling.\n",
+            args->prog, bigendian_p() ? "big" : "little");
+  }
   return i;
 }
 
@@ -222,13 +234,13 @@ dump_file(mrb_state *mrb, FILE *wfp, const char *outfile, struct RProc *proc, st
   mrb_irep *irep = proc->body.irep;
 
   if (args->initname) {
-    n = mrb_dump_irep_cfunc(mrb, irep, args->debug_info, wfp, args->initname);
+    n = mrb_dump_irep_cfunc(mrb, irep, args->flags, wfp, args->initname);
     if (n == MRB_DUMP_INVALID_ARGUMENT) {
       fprintf(stderr, "%s: invalid C language symbol name\n", args->initname);
     }
   }
   else {
-    n = mrb_dump_irep_binary(mrb, irep, args->debug_info, wfp);
+    n = mrb_dump_irep_binary(mrb, irep, args->flags, wfp);
   }
   if (n != MRB_DUMP_OK) {
     fprintf(stderr, "%s: error in mrb dump (%s) %d\n", args->prog, outfile, n);