add new instruction attribute called leaf

An instruction is leaf if it has no rb_funcall inside.  In order to
check this property, we introduce stack canary which is a random
number collected at runtime.  Stack top is always filled with this
number and checked for stack smashing operations, when VM_CHECK_MODE.
[GH-1947]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64677 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/variable.c b/variable.c
index 32e71fccb4..1c23173d6c 100644
--- a/variable.c
+++ b/variable.c
@@ -867,6 +867,24 @@ rb_gvar_defined(struct rb_global_entry *entry)
     return Qtrue;
 }
 
+rb_gvar_getter_t *
+rb_gvar_getter_function_of(const struct rb_global_entry *entry)
+{
+    return entry->var->getter;
+}
+
+rb_gvar_setter_t *
+rb_gvar_setter_function_of(const struct rb_global_entry *entry)
+{
+    return entry->var->setter;
+}
+
+bool
+rb_gvar_is_traced(const struct rb_global_entry *entry)
+{
+    return !!entry->var->trace;
+}
+
 static enum rb_id_table_iterator_result
 gvar_i(ID key, VALUE val, void *a)
 {