iseq.c: dump type of branchiftype on disasm

This makes easier to debug scripts related to r59950.

* before

$ ./ruby --dump=insns -e '"#{a}"'
== disasm: #<ISeq:<main>@-e>============================================
0000 putobject        ""                                              (   1)[Li]
0002 putself
0003 opt_send_without_block <callinfo!mid:a, argc:0, FCALL|VCALL|ARGS_SIMPLE>, <callcache>
0006 dup
0007 branchiftype     5, 15
0010 dup
0011 opt_send_without_block <callinfo!mid:to_s, argc:0, FCALL|ARGS_SIMPLE>, <callcache>
0014 tostring
0015 concatstrings    2
0017 leave

* after

$ ./ruby --dump=insns -e '"#{a}"'
== disasm: #<ISeq:<main>@-e>============================================
0000 putobject        ""                                              (   1)[Li]
0002 putself
0003 opt_send_without_block <callinfo!mid:a, argc:0, FCALL|VCALL|ARGS_SIMPLE>, <callcache>
0006 dup
0007 branchiftype     T_STRING, 15
0010 dup
0011 opt_send_without_block <callinfo!mid:to_s, argc:0, FCALL|ARGS_SIMPLE>, <callcache>
0014 tostring
0015 concatstrings    2
0017 leave

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61217 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

internal.h

@@ -1842,6 +1842,7 @@ VALUE rb_check_block_call(VALUE, ID, int, const VALUE *, rb_block_call_func_t, V
 typedef void rb_check_funcall_hook(int, VALUE, ID, int, const VALUE *, VALUE);
 VALUE rb_check_funcall_with_hook(VALUE recv, ID mid, int argc, const VALUE *argv,
 				 rb_check_funcall_hook *hook, VALUE arg);
+const char *rb_type_str(enum ruby_value_type type);
 VALUE rb_check_funcall_default(VALUE, ID, int, const VALUE *, VALUE);
 VALUE rb_yield_1(VALUE val);
 VALUE rb_yield_force_blockarg(VALUE values);

iseq.c

@@ -1344,7 +1344,15 @@ rb_insn_operand_intern(const rb_iseq_t *iseq,
 	break;
 
       case TS_NUM:		/* ULONG */
-	ret = rb_sprintf("%"PRIuVALUE, op);
+	{
+	    const char *type_str;
+	    if (insn == BIN(branchiftype) && (type_str = rb_type_str((enum ruby_value_type)op)) != NULL) {
+		ret = rb_str_new_cstr(type_str);
+	    }
+	    else {
+		ret = rb_sprintf("%"PRIuVALUE, op);
+	    }
+	}
 	break;
 
       case TS_LINDEX:{

vm_eval.c

@@ -440,7 +440,7 @@ rb_check_funcall_with_hook(VALUE recv, ID mid, int argc, const VALUE *argv,
     return vm_call0(ec, recv, mid, argc, argv, me);
 }
 
-static const char *
+const char *
 rb_type_str(enum ruby_value_type type)
 {
 #define type_case(t) case t: return #t;