diff a/src/hotspot/share/opto/c2_globals.hpp b/src/hotspot/share/opto/c2_globals.hpp
--- a/src/hotspot/share/opto/c2_globals.hpp
+++ b/src/hotspot/share/opto/c2_globals.hpp
@@ -532,10 +532,19 @@
                                                                             \
   product(intx, EliminateAllocationArraySizeLimit, 64,                      \
           "Array size (number of elements) limit for scalar replacement")   \
           range(0, max_jint)                                                \
                                                                             \
+  experimental(bool, UseStackAllocation, false,                             \
+          "Leverage stack allocation to reduce heap pressure")              \
+                                                                            \
+  experimental(bool, UseStackAllocationRuntime, false,                      \
+          "Enable the stack allocation runtime code in oopmap")             \
+                                                                            \
+  notproduct(bool, PrintStackAllocation, false,                             \
+          "Print stack allocation debug information")                       \
+                                                                            \
   product(bool, OptimizePtrCompare, true,                                   \
           "Use escape analysis to optimize pointers compare")               \
                                                                             \
   notproduct(bool, PrintOptimizePtrCompare, false,                          \
           "Print information about optimized pointers compare")             \