add mruby-strip tool to strip irep's debug info

mrbgems/mruby-bin-strip/bintest/mruby-strip.rb

+require 'tempfile'
+
+assert('no files') do
+  o = `bin/mruby-strip 2>&1`
+  assert_equal 1, $?.exitstatus
+  assert_equal "no files to strip\n", o
+end
+
+assert('file not found') do
+  o = `bin/mruby-strip not_found.mrb 2>&1`
+  assert_equal 1, $?.exitstatus
+  assert_equal "can't open file not_found.mrb\n", o
+end
+
+assert('not irep file') do
+  t = Tempfile.new('script.rb')
+  t.write 'p test\n'
+  t.flush
+  o = `bin/mruby-strip #{t.path} 2>&1`
+  assert_equal 1, $?.exitstatus
+  assert_equal "can't read irep file #{t.path}\n", o
+end
+
+assert('success') do
+  script_file, compiled1, compiled2 =
+    Tempfile.new('script.rb'), Tempfile.new('c1.mrb'), Tempfile.new('c2.mrb')
+  script_file.write "p 'test'\n"
+  script_file.flush
+  `bin/mrbc -g -o #{compiled1.path} #{script_file.path}`
+  `bin/mrbc -g -o #{compiled2.path} #{script_file.path}`
+
+  o = `bin/mruby-strip #{compiled1.path}`
+  assert_equal 0, $?.exitstatus
+  assert_equal "", o
+
+  o = `bin/mruby-strip #{compiled1.path} #{compiled2.path}`
+  assert_equal 0, $?.exitstatus
+  assert_equal "", o
+end
+
+assert('check debug section') do
+  script_file, with_debug, without_debug =
+    Tempfile.new('script.rb'), Tempfile.new('c1.mrb'), Tempfile.new('c2.mrb')
+  script_file.write "p 'test'\n"
+  script_file.flush
+  `bin/mrbc -o #{without_debug.path} #{script_file.path}`
+  `bin/mrbc -g -o #{with_debug.path} #{script_file.path}`
+
+  assert_true with_debug.size >= without_debug.size
+
+  `bin/mruby-strip #{with_debug.path}`
+  assert_equal without_debug.size, with_debug.size
+end

mrbgems/mruby-bin-strip/mrbgem.rake

+MRuby::Gem::Specification.new('mruby-bin-strip') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+  spec.bins = %w(mruby-strip)
+end

mrbgems/mruby-bin-strip/tools/mruby-strip/mruby-strip.c

+#include <stdio.h>
+#include <stdlib.h>
+#include "mruby.h"
+#include "mruby/irep.h"
+#include "mruby/dump.h"
+
+int
+main(int argc, char **argv)
+{
+  int i, dump_result;
+  FILE **files;
+  mrb_irep **ireps;
+  mrb_state *mrb;
+
+  if (argc <= 1) {
+    fprintf(stderr, "no files to strip\n");
+    return EXIT_FAILURE;
+  }
+
+  files = (FILE**)malloc(sizeof(FILE*) * argc);
+  for (i = 1; i < argc; ++i) {
+    files[i] = fopen(argv[i], "rb");
+
+    if (!files[i]) {
+      fprintf(stderr, "can't open file %s\n", argv[i]);
+      return EXIT_FAILURE;
+    }
+  }
+
+  mrb = mrb_open();
+
+  ireps = (mrb_irep**)malloc(sizeof(mrb_irep*) * argc);
+  for (i = 1; i < argc; ++i) {
+    ireps[i] = mrb_read_irep_file(mrb, files[i]);
+    if (!ireps[i]) {
+      fprintf(stderr, "can't read irep file %s\n", argv[i]);
+      return EXIT_FAILURE;
+    }
+    fclose(files[i]);
+    files[i] = fopen(argv[i], "wb");
+    if (!ireps[i]) {
+      fprintf(stderr, "can't reopen irep file %s\n", argv[i]);
+      return EXIT_FAILURE;
+    }
+  }
+
+  for (i = 1; i < argc; ++i) {
+    /* debug flag must be alway false */
+    dump_result = mrb_dump_irep_binary(mrb, ireps[i], FALSE, files[i]);
+    if (dump_result != MRB_DUMP_OK) {
+      fprintf(stderr, "error occur when dumping %s", argv[i]);
+      return EXIT_FAILURE;
+    }
+  }
+
+  mrb_close(mrb);
+  return EXIT_SUCCESS;
+}