* compile.c (iseq_compile_each): emit opt_str_freeze if the #freeze

  method is called on a static string literal with no arguments.

* defs/id.def (firstline): add freeze so idFreeze is available

* insns.def (opt_str_freeze): add opt_str_freeze instruction which
  pushes a frozen string literal without allocating a new object if
  String#freeze is not overriden

* string.c (Init_String): define String#freeze

* vm.c (vm_init_redefined_flag): define BOP_FREEZE on String class as
  a basic operation

* vm_insnhelper.h: ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43627 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/insns.def b/insns.def
index 6075d98db2..63a36b3979 100644
--- a/insns.def
+++ b/insns.def
@@ -999,6 +999,20 @@ send
     CALL_METHOD(ci);
 }
 
+DEFINE_INSN
+opt_str_freeze
+(VALUE str)
+()
+(VALUE val)
+{
+    if (BASIC_OP_UNREDEFINED_P(BOP_FREEZE, STRING_REDEFINED_OP_FLAG)) {
+	val = str;
+    }
+    else {
+	val = rb_funcall(rb_str_resurrect(str), idFreeze, 0);
+    }
+}
+
 /**
   @c optimize
   @e Invoke method without block, splat