https://git.ruby-lang.org/ruby.git/commit/?id=8613c0c675

From 8613c0c6758b8d560b2461bd540c815d28fcf844 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Fri, 27 Aug 2021 16:19:56 +0900
Subject: Introduce an option "--dump=insns_without_opt" for debugging purposes

---
 iseq.c    | 4 ++--
 ruby.c    | 9 ++++++---
 vm_core.h | 2 +-
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/iseq.c b/iseq.c
index e42525cb9fa..21622fa288b 100644
--- a/iseq.c
+++ b/iseq.c
@@ -866,11 +866,11 @@ rb_iseq_new_top(const rb_ast_body_t *ast, VALUE name, VALUE path, VALUE realpath https://github.com/ruby/ruby/blob/trunk/iseq.c#L866
 }
 
 rb_iseq_t *
-rb_iseq_new_main(const rb_ast_body_t *ast, VALUE path, VALUE realpath, const rb_iseq_t *parent)
+rb_iseq_new_main(const rb_ast_body_t *ast, VALUE path, VALUE realpath, const rb_iseq_t *parent, int opt)
 {
     return rb_iseq_new_with_opt(ast, rb_fstring_lit("<main>"),
 				path, realpath, INT2FIX(0),
-				parent, 0, ISEQ_TYPE_MAIN, &COMPILE_OPTION_DEFAULT);
+				parent, 0, ISEQ_TYPE_MAIN, opt ? &COMPILE_OPTION_DEFAULT : &COMPILE_OPTION_FALSE);
 }
 
 rb_iseq_t *
diff --git a/ruby.c b/ruby.c
index b9ed1ae89c4..09b7c770cf5 100644
--- a/ruby.c
+++ b/ruby.c
@@ -143,13 +143,15 @@ enum feature_flag_bits { https://github.com/ruby/ruby/blob/trunk/ruby.c#L143
     X(parsetree_with_comment) \
     SEP \
     X(insns) \
+    SEP \
+    X(insns_without_opt) \
     /* END OF DUMPS */
 enum dump_flag_bits {
     dump_version_v,
     EACH_DUMPS(DEFINE_DUMP, COMMA),
     dump_exit_bits = (DUMP_BIT(yydebug) | DUMP_BIT(syntax) |
 		      DUMP_BIT(parsetree) | DUMP_BIT(parsetree_with_comment) |
-		      DUMP_BIT(insns))
+		      DUMP_BIT(insns) | DUMP_BIT(insns_without_opt))
 };
 
 typedef struct ruby_cmdline_options ruby_cmdline_options_t;
@@ -330,6 +332,7 @@ usage(const char *name, int help, int highlight, int columns) https://github.com/ruby/ruby/blob/trunk/ruby.c#L332
     };
     static const struct message dumps[] = {
 	M("insns",                  "", "instruction sequences"),
+	M("insns_without_out",      "", "instruction sequences compiled with no optimization"),
 	M("yydebug",                "", "yydebug of yacc parser generator"),
 	M("parsetree",              "", "AST"),
 	M("parsetree_with_comment", "", "AST with comments"),
@@ -2161,11 +2164,11 @@ process_options(int argc, char **argv, ruby_cmdline_options_t *opt) https://github.com/ruby/ruby/blob/trunk/ruby.c#L2164
         GetBindingPtr(rb_const_get(rb_cObject, rb_intern("TOPLEVEL_BINDING")),
                       toplevel_binding);
         const struct rb_block *base_block = toplevel_context(toplevel_binding);
-	iseq = rb_iseq_new_main(&ast->body, opt->script_name, path, vm_block_iseq(base_block));
+	iseq = rb_iseq_new_main(&ast->body, opt->script_name, path, vm_block_iseq(base_block), !(dump & DUMP_BIT(insns_without_opt)));
 	rb_ast_dispose(ast);
     }
 
-    if (dump & DUMP_BIT(insns)) {
+    if (dump & (DUMP_BIT(insns) | DUMP_BIT(insns_without_opt))) {
 	rb_io_write(rb_stdout, rb_iseq_disasm((const rb_iseq_t *)iseq));
 	rb_io_flush(rb_stdout);
 	dump &= ~DUMP_BIT(insns);
diff --git a/vm_core.h b/vm_core.h
index bcb0255a004..78d06012a14 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1105,7 +1105,7 @@ RUBY_SYMBOL_EXPORT_BEGIN https://github.com/ruby/ruby/blob/trunk/vm_core.h#L1105
 /* node -> iseq */
 rb_iseq_t *rb_iseq_new         (const rb_ast_body_t *ast, VALUE name, VALUE path, VALUE realpath,                     const rb_iseq_t *parent, enum iseq_type);
 rb_iseq_t *rb_iseq_new_top     (const rb_ast_body_t *ast, VALUE name, VALUE path, VALUE realpath,                     const rb_iseq_t *parent);
-rb_iseq_t *rb_iseq_new_main    (const rb_ast_body_t *ast,             VALUE path, VALUE realpath,                     const rb_iseq_t *parent);
+rb_iseq_t *rb_iseq_new_main    (const rb_ast_body_t *ast,             VALUE path, VALUE realpath,                     const rb_iseq_t *parent, int opt);
 rb_iseq_t *rb_iseq_new_eval    (const rb_ast_body_t *ast, VALUE name, VALUE path, VALUE realpath, VALUE first_lineno, const rb_iseq_t *parent, int isolated_depth);
 rb_iseq_t *rb_iseq_new_with_opt(const rb_ast_body_t *ast, VALUE name, VALUE path, VALUE realpath, VALUE first_lineno, const rb_iseq_t *parent, int isolated_depth,
                                 enum iseq_type, const rb_compile_option_t*);
-- 
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