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, 1 insertions, 0 deletions

diff --git a/inits.c b/inits.c
index 13fa069236..c9687de516 100644
--- a/inits.c
+++ b/inits.c
@@ -61,6 +61,7 @@ rb_call_inits(void)
     CALL(Complex);
     CALL(version);
     CALL(vm_trace);
+    CALL(vm_stack_canary);
     CALL(ast);
 }
 #undef CALL