https://git.ruby-lang.org/ruby.git/commit/?id=b44c5187b4

From b44c5187b4d05d8644242e532f2243210d0b74df Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 7 Jul 2021 12:22:40 +0900
Subject: Expose instruction information for debuggers [Feature #18026]

---
 tool/ruby_vm/views/_insn_len_info.erb     | 23 +++++++++++++++--------
 tool/ruby_vm/views/_insn_name_info.erb    | 30 ++++++++++++++++++------------
 tool/ruby_vm/views/_insn_operand_info.erb | 29 ++++++++++++++++++-----------
 3 files changed, 51 insertions(+), 31 deletions(-)

diff --git a/tool/ruby_vm/views/_insn_len_info.erb b/tool/ruby_vm/views/_insn_len_info.erb
index b292f42fb5..569dca5845 100644
--- a/tool/ruby_vm/views/_insn_len_info.erb
+++ b/tool/ruby_vm/views/_insn_len_info.erb
@@ -7,15 +7,22 @@ https://github.com/ruby/ruby/blob/trunk/tool/ruby_vm/views/_insn_len_info.erb#L7
 %# details.
 CONSTFUNC(MAYBE_UNUSED(static int insn_len(VALUE insn)));
 
-int
-insn_len(VALUE i)
-{
-    static const char t[] = {
+RUBY_SYMBOL_EXPORT_BEGIN /* for debuggers */
+extern const uint8_t rb_vm_insn_len_info[VM_INSTRUCTION_SIZE];
+RUBY_SYMBOL_EXPORT_END
+
+#ifdef RUBY_VM_INSNS_INFO
+const uint8_t rb_vm_insn_len_info[] = {
 % RubyVM::Instructions.each_slice 23 do |a|
-        <%= a.map(&:width).join(', ') -%>,
+    <%= a.map(&:width).join(', ') -%>,
 % end
-    };
+};
 
-    ASSERT_VM_INSTRUCTION_SIZE(t);
-    return t[i];
+ASSERT_VM_INSTRUCTION_SIZE(rb_vm_insn_len_info);
+#endif
+
+int
+insn_len(VALUE i)
+{
+    return rb_vm_insn_len_info[i];
 }
diff --git a/tool/ruby_vm/views/_insn_name_info.erb b/tool/ruby_vm/views/_insn_name_info.erb
index 767346093e..e7ded75e65 100644
--- a/tool/ruby_vm/views/_insn_name_info.erb
+++ b/tool/ruby_vm/views/_insn_name_info.erb
@@ -13,26 +13,32 @@ https://github.com/ruby/ruby/blob/trunk/tool/ruby_vm/views/_insn_name_info.erb#L13
 %
 CONSTFUNC(MAYBE_UNUSED(static const char *insn_name(VALUE insn)));
 
+RUBY_SYMBOL_EXPORT_BEGIN /* for debuggers */
+extern const int rb_vm_max_insn_name_size;
+extern const char rb_vm_insn_name_base[];
+extern const unsigned short rb_vm_insn_name_offset[VM_INSTRUCTION_SIZE];
+RUBY_SYMBOL_EXPORT_END
+
 #ifdef RUBY_VM_INSNS_INFO
 const int rb_vm_max_insn_name_size = <%= a.map(&:size).max %>;
-#endif
 
-const char *
-insn_name(VALUE i)
-{
-    static const char x[] =
+const char rb_vm_insn_name_base[] =
 % a.each do |i|
-        <%=cstr i%> "\0"
+    <%=cstr i%> "\0"
 % end
-        ;
+    ;
 
-    static const unsigned short y[] = {
+const unsigned short rb_vm_insn_name_offset[] = {
 % c.each_slice 12 do |d|
-        <%= d.map {|i| sprintf("%4d", i) }.join(', ') %>,
+    <%= d.map {|i| sprintf("%4d", i) }.join(', ') %>,
 % end
-    };
+};
 
-    ASSERT_VM_INSTRUCTION_SIZE(y);
+ASSERT_VM_INSTRUCTION_SIZE(rb_vm_insn_name_offset);
+#endif
 
-    return &x[y[i]];
+const char *
+insn_name(VALUE i)
+{
+    return &rb_vm_insn_name_base[rb_vm_insn_name_offset[i]];
 }
diff --git a/tool/ruby_vm/views/_insn_operand_info.erb b/tool/ruby_vm/views/_insn_operand_info.erb
index 69d361521a..996c33e960 100644
--- a/tool/ruby_vm/views/_insn_operand_info.erb
+++ b/tool/ruby_vm/views/_insn_operand_info.erb
@@ -14,24 +14,31 @@ https://github.com/ruby/ruby/blob/trunk/tool/ruby_vm/views/_insn_operand_info.erb#L14
 CONSTFUNC(MAYBE_UNUSED(static const char *insn_op_types(VALUE insn)));
 CONSTFUNC(MAYBE_UNUSED(static int insn_op_type(VALUE insn, long pos)));
 
-const char *
-insn_op_types(VALUE i)
-{
-    static const char x[] =
+RUBY_SYMBOL_EXPORT_BEGIN /* for debuggers */
+extern const char rb_vm_insn_op_base[];
+extern const unsigned short rb_vm_insn_op_offset[VM_INSTRUCTION_SIZE];
+RUBY_SYMBOL_EXPORT_END
+
+#ifdef RUBY_VM_INSNS_INFO
+const char rb_vm_insn_op_base[] =
 % a.each_slice 5 do |d|
-        <%= d.map {|i| sprintf("%-6s", cstr(i)) }.join(' "\0" ') %> "\0"
+    <%= d.map {|i| sprintf("%-6s", cstr(i)) }.join(' "\0" ') %> "\0"
 % end
-        ;
+    ;
 
-    static const unsigned short y[] = {
+const unsigned short rb_vm_insn_op_offset[] = {
 % c.each_slice 12 do |d|
-        <%= d.map {|i| sprintf("%3d", i) }.join(', ') %>,
+    <%= d.map {|i| sprintf("%3d", i) }.join(', ') %>,
 % end
-    };
+};
 
-    ASSERT_VM_INSTRUCTION_SIZE(y);
+ASSERT_VM_INSTRUCTION_SIZE(rb_vm_insn_op_offset);
+#endif
 
-    return &x[y[i]];
+const char *
+insn_op_types(VALUE i)
+{
+    return &rb_vm_insn_op_base[rb_vm_insn_op_offset[i]];
 }
 
 int
-- 
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