rustc: Use obstacks in lieu of dynamically-allocated frames only when the frame is actually dynamically-sized

1 files changed, 10 insertions, 15 deletions

diff --git a/src/rt/rust_shape.cpp b/src/rt/rust_shape.cpp
index c23d3aaa858..e5b96e7e91f 100644
--- a/src/rt/rust_shape.cpp
+++ b/src/rt/rust_shape.cpp
@@ -64,18 +64,6 @@ const uint8_t CMP_LT = 1u;
 const uint8_t CMP_LE = 2u;
 
 
-// Utility functions
-
-// Rounds |size| to the nearest |alignment|. Invariant: |alignment| is a power
-// of two.
-template<typename T>
-static inline T
-align_to(T size, size_t alignment) {
-    assert(alignment);
-    T x = (T)(((uintptr_t)size + alignment - 1) & ~(alignment - 1));
-    return x;
-}
-
 // Utility classes
 
 struct size_align {
@@ -185,11 +173,18 @@ public:
     }
 };
 
-inline ptr_pair
-align_to(const ptr_pair &pair, size_t n) {
-    return ptr_pair::make(align_to(pair.fst, n), align_to(pair.snd, n));
+}   // end namespace shape
+
+
+inline shape::ptr_pair
+align_to(const shape::ptr_pair &pair, size_t n) {
+    return shape::ptr_pair::make(align_to(pair.fst, n),
+                                 align_to(pair.snd, n));
 }
 
+
+namespace shape {
+
 // NB: This function does not align.
 template<typename T>
 inline data_pair<T>