Compile with MicroJIT disabled when scrape fails

This is just so we can build successfully on -O0 and other cases that
are not supported by the code scraper.

2 files changed, 14 insertions, 12 deletions

diff --git a/tool/ruby_vm/models/micro_jit.rb b/tool/ruby_vm/models/micro_jit.rb
index 4473f617fc..eb20fe7335 100644
--- a/tool/ruby_vm/models/micro_jit.rb
+++ b/tool/ruby_vm/models/micro_jit.rb
@@ -176,20 +176,20 @@ module RubyVM::MicroJIT
       else
         raise 'Unkonwn platform. Only Mach-O on macOS and ELF on Linux are supported'
       end
+      [true, comma_separated_hex_string(@pre_call_bytes), comma_separated_hex_string(@post_call_bytes)]
+    rescue => e
+      print_warning("scrape failed: #{e.message}")
+      [false, '', '']
     end
 
-    def comma_separated_hex_string(nums)
-      nums.map{ |byte| '0x'+byte}.join(', ')
-    end
-
-    def pre_call_bytes
-      scrape unless @pre_call_bytes
-      comma_separated_hex_string(@pre_call_bytes)
+    def print_warning(text)
+      text = "ujit warning: #{text}"
+      text = "\x1b[1m#{text}\x1b[0m" if STDOUT.tty?
+      STDOUT.puts(text)
     end
 
-    def post_call_bytes
-      scrape unless @post_call_bytes
-      comma_separated_hex_string(@post_call_bytes)
+    def comma_separated_hex_string(nums)
+      nums.map{ |byte| '0x'+byte}.join(', ')
     end
   end
 end
diff --git a/tool/ruby_vm/views/ujit_examples.inc.erb b/tool/ruby_vm/views/ujit_examples.inc.erb
index a301c5ca74..5fefcd4674 100644
--- a/tool/ruby_vm/views/ujit_examples.inc.erb
+++ b/tool/ruby_vm/views/ujit_examples.inc.erb
@@ -12,5 +12,7 @@
     edit: __FILE__,
 } -%>
 
-static const uint8_t ujit_pre_call_bytes[] = { <%= RubyVM::MicroJIT.pre_call_bytes %> };
-static const uint8_t ujit_post_call_bytes[] = { <%= RubyVM::MicroJIT.post_call_bytes %> };
+% success, pre_call_bytes, post_call_bytes = RubyVM::MicroJIT.scrape
+static const uint8_t ujit_scrape_successful = <%= success %>;
+static const uint8_t ujit_pre_call_bytes[] = { <%= pre_call_bytes %> };
+static const uint8_t ujit_post_call_bytes[] = { <%= post_call_bytes %> };