1 files changed, 17 insertions, 5 deletions
diff --git a/lib/tsan/rtl/tsan_vector.h b/lib/tsan/rtl/tsan_vector.h
index fa236b1f1e44..a7fb3fa58d54 100644
--- a/lib/tsan/rtl/tsan_vector.h
+++ b/lib/tsan/rtl/tsan_vector.h
@@ -58,10 +58,18 @@ class Vector {
     return begin_[i];
   }
 
-  T *PushBack(T v = T()) {
+  T *PushBack() {
     EnsureSize(Size() + 1);
-    end_[-1] = v;
-    return &end_[-1];
+    T *p = &end_[-1];
+    internal_memset(p, 0, sizeof(*p));
+    return p;
+  }
+
+  T *PushBack(const T& v) {
+    EnsureSize(Size() + 1);
+    T *p = &end_[-1];
+    internal_memcpy(p, &v, sizeof(*p));
+    return p;
   }
 
   void PopBack() {
@@ -70,11 +78,15 @@ class Vector {
   }
 
   void Resize(uptr size) {
+    if (size == 0) {
+      end_ = begin_;
+      return;
+    }
     uptr old_size = Size();
     EnsureSize(size);
     if (old_size < size) {
       for (uptr i = old_size; i < size; i++)
-        begin_[i] = T();
+        internal_memset(&begin_[i], 0, sizeof(begin_[i]));
     }
   }
 
@@ -92,7 +104,7 @@ class Vector {
       return;
     }
     uptr cap0 = last_ - begin_;
-    uptr cap = 2 * cap0;
+    uptr cap = cap0 * 5 / 4;  // 25% growth
     if (cap == 0)
       cap = 16;
     if (cap < size)