Expand tabs for rb_mjit_header.h

I can't live without this when using gdb or perf report.

See also: [Misc #16112]

1 files changed, 35 insertions, 0 deletions

diff --git a/tool/run_without_tabs.rb b/tool/run_without_tabs.rb
new file mode 100644
index 0000000000..0ac21f90ce
--- /dev/null
+++ b/tool/run_without_tabs.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+# This is a script to run a command in ARGV, expanding tabs in some files
+# included by vm.c to normalize indentation of MJIT header.
+#
+# Note that preprocessor of GCC converts a hard tab to one spaces, where
+# we expect it to be shown as 8 spaces. To obviate this script, we need
+# to convert all tabs to spaces in these files.
+
+require 'fileutils'
+
+srcdir = File.expand_path('..', __dir__)
+targets = Dir.glob(File.join(srcdir, 'vm*.*'))
+sources = {}
+mtimes = {}
+
+targets.each do |target|
+  sources[target] = File.read(target)
+  mtimes[target] = File.mtime(target)
+
+  expanded = sources[target].gsub(/^\t+/) { |tab| ' ' * 8 * tab.length }
+  if sources[target] == expanded
+    puts "#{target.dump} has no hard tab indentation. This should be ignored in tool/run_without_tabs.rb."
+  end
+  File.write(target, expanded)
+  FileUtils.touch(target, mtime: mtimes[target])
+end
+
+result = system(*ARGV)
+
+targets.each do |target|
+  File.write(target, sources.fetch(target))
+  FileUtils.touch(target, mtime: mtimes.fetch(target))
+end
+
+exit result