[sanitizer] Add InternalMmapVector::swap

llvm-svn: 331736

compiler-rt/lib/sanitizer_common/sanitizer_common.h

@@ -510,6 +510,12 @@ class InternalMmapVectorNoCtor {
     return data() + size();
   }
 
+  void swap(InternalMmapVectorNoCtor &other) {
+    Swap(data_, other.data_);
+    Swap(capacity_, other.capacity_);
+    Swap(size_, other.size_);
+  }
+
  private:
   void Resize(uptr new_capacity) {
     CHECK_GT(new_capacity, 0);

compiler-rt/lib/sanitizer_common/tests/sanitizer_common_test.cc

@@ -130,6 +130,24 @@ TEST(SanitizerCommon, InternalMmapVectorEq) {
   EXPECT_TRUE(vector1 != vector2);
 }
 
+TEST(SanitizerCommon, InternalMmapVectorSwap) {
+  InternalMmapVector<uptr> vector1;
+  InternalMmapVector<uptr> vector2;
+  InternalMmapVector<uptr> vector3;
+  InternalMmapVector<uptr> vector4;
+  for (uptr i = 0; i < 100; i++) {
+    vector1.push_back(i);
+    vector2.push_back(i);
+    vector3.push_back(-i);
+    vector4.push_back(-i);
+  }
+  EXPECT_NE(vector2, vector3);
+  EXPECT_NE(vector1, vector4);
+  vector1.swap(vector3);
+  EXPECT_EQ(vector2, vector3);
+  EXPECT_EQ(vector1, vector4);
+}
+
 void TestThreadInfo(bool main) {
   uptr stk_addr = 0;
   uptr stk_size = 0;