6 files changed, 194 insertions, 11 deletions
diff --git a/absl/container/BUILD.bazel b/absl/container/BUILD.bazel
index 0488857e7c58..99a72482467e 100644
--- a/absl/container/BUILD.bazel
+++ b/absl/container/BUILD.bazel
@@ -198,11 +198,23 @@ cc_test(
     deps = [
         ":inlined_vector",
         "//absl/base",
+        "//absl/base:core_headers",
         "//absl/strings",
         "@com_github_google_benchmark//:benchmark_main",
     ],
 )
 
+cc_test(
+    name = "inlined_vector_exception_safety_test",
+    srcs = ["inlined_vector_exception_safety_test.cc"],
+    copts = ABSL_TEST_COPTS + ABSL_EXCEPTIONS_FLAG,
+    deps = [
+        ":inlined_vector",
+        "//absl/base:exception_safety_testing",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
 cc_library(
     name = "test_instance_tracker",
     testonly = 1,
diff --git a/absl/container/CMakeLists.txt b/absl/container/CMakeLists.txt
index 1e203dbf1ccc..526e37af3db2 100644
--- a/absl/container/CMakeLists.txt
+++ b/absl/container/CMakeLists.txt
@@ -195,6 +195,22 @@ absl_cc_test(
     gmock_main
 )
 
+absl_cc_test(
+  NAME
+    inlined_vector_exception_safety_test
+  SRCS
+    "inlined_vector_exception_safety_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+    ${ABSL_EXCEPTIONS_FLAG}
+  LINKOPTS
+    ${ABSL_EXCEPTIONS_FLAG_LINKOPTS}
+  DEPS
+    absl::inlined_vector
+    absl::exception_safety_testing
+    gmock_main
+)
+
 absl_cc_library(
   NAME
     test_instance_tracker
diff --git a/absl/container/inlined_vector.h b/absl/container/inlined_vector.h
index 16865272c481..61e0cfb4a3a4 100644
--- a/absl/container/inlined_vector.h
+++ b/absl/container/inlined_vector.h
@@ -784,16 +784,20 @@ class InlinedVector {
   // Destroys all elements in the inlined vector, sets the size of `0` and
   // deallocates the heap allocation if the inlined vector was allocated.
   void clear() noexcept {
-    size_type s = size();
-    if (storage_.GetIsAllocated()) {
-      Destroy(storage_.GetAllocatedData(), storage_.GetAllocatedData() + s);
-      AllocatorTraits::deallocate(storage_.GetAllocator(),
-                                  storage_.GetAllocatedData(),
+    const bool is_allocated = storage_.GetIsAllocated();
+
+    pointer the_data =
+        is_allocated ? storage_.GetAllocatedData() : storage_.GetInlinedData();
+
+    inlined_vector_internal::DestroyElements(storage_.GetAllocator(), the_data,
+                                             storage_.GetSize());
+
+    if (is_allocated) {
+      AllocatorTraits::deallocate(storage_.GetAllocator(), the_data,
                                   storage_.GetAllocatedCapacity());
-    } else if (s != 0) {  // do nothing for empty vectors
-      Destroy(storage_.GetInlinedData(), storage_.GetInlinedData() + s);
     }
-    storage_.SetInlinedSize(0);
+
+    storage_.SetInlinedSize(/* size = */ 0);
   }
 
   // `InlinedVector::reserve()`
diff --git a/absl/container/inlined_vector_benchmark.cc b/absl/container/inlined_vector_benchmark.cc
index 867a29ea32c1..7bb3271b470a 100644
--- a/absl/container/inlined_vector_benchmark.cc
+++ b/absl/container/inlined_vector_benchmark.cc
@@ -1,4 +1,4 @@
-// Copyright 2017 The Abseil Authors.
+// Copyright 2019 The Abseil Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,13 +12,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "absl/container/inlined_vector.h"
-
 #include <string>
 #include <vector>
 
 #include "benchmark/benchmark.h"
 #include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/container/inlined_vector.h"
 #include "absl/strings/str_cat.h"
 
 namespace {
@@ -373,4 +373,72 @@ void BM_StdVectorEmpty(benchmark::State& state) {
 }
 BENCHMARK(BM_StdVectorEmpty);
 
+constexpr size_t kInlineElements = 4;
+constexpr size_t kSmallSize = kInlineElements / 2;
+constexpr size_t kLargeSize = kInlineElements * 2;
+constexpr size_t kBatchSize = 100;
+
+struct TrivialType {
+  size_t val;
+};
+
+using TrivialVec = absl::InlinedVector<TrivialType, kInlineElements>;
+
+class NontrivialType {
+ public:
+  ABSL_ATTRIBUTE_NOINLINE NontrivialType() : val_() {}
+
+  ABSL_ATTRIBUTE_NOINLINE NontrivialType(const NontrivialType& other)
+      : val_(other.val_) {}
+
+  ABSL_ATTRIBUTE_NOINLINE NontrivialType& operator=(
+      const NontrivialType& other) {
+    val_ = other.val_;
+    return *this;
+  }
+
+  ABSL_ATTRIBUTE_NOINLINE ~NontrivialType() noexcept {}
+
+ private:
+  size_t val_;
+};
+
+using NontrivialVec = absl::InlinedVector<NontrivialType, kInlineElements>;
+
+#define BENCHMARK_OPERATION(BM_Function)                      \
+  BENCHMARK_TEMPLATE(BM_Function, TrivialVec, kSmallSize);    \
+  BENCHMARK_TEMPLATE(BM_Function, TrivialVec, kLargeSize);    \
+  BENCHMARK_TEMPLATE(BM_Function, NontrivialVec, kSmallSize); \
+  BENCHMARK_TEMPLATE(BM_Function, NontrivialVec, kLargeSize)
+
+template <typename VecT, typename PrepareVec, typename TestVec>
+void BatchedBenchmark(benchmark::State& state, PrepareVec prepare_vec,
+                      TestVec test_vec) {
+  VecT vectors[kBatchSize];
+
+  while (state.KeepRunningBatch(kBatchSize)) {
+    // Prepare batch
+    state.PauseTiming();
+    for (auto& vec : vectors) {
+      prepare_vec(&vec);
+    }
+    benchmark::DoNotOptimize(vectors);
+    state.ResumeTiming();
+
+    // Test batch
+    for (auto& vec : vectors) {
+      test_vec(&vec);
+    }
+  }
+}
+
+template <typename VecT, size_t Size>
+void BM_Clear(benchmark::State& state) {
+  BatchedBenchmark<VecT>(
+      state,
+      /* prepare_vec = */ [](VecT* vec) { vec->resize(Size); },
+      /* test_vec = */ [](VecT* vec) { vec->clear(); });
+}
+BENCHMARK_OPERATION(BM_Clear);
+
 }  // namespace
diff --git a/absl/container/inlined_vector_exception_safety_test.cc b/absl/container/inlined_vector_exception_safety_test.cc
new file mode 100644
index 000000000000..0af048b1718a
--- /dev/null
+++ b/absl/container/inlined_vector_exception_safety_test.cc
@@ -0,0 +1,55 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <memory>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/exception_safety_testing.h"
+#include "absl/container/inlined_vector.h"
+
+namespace {
+
+constexpr size_t kInlined = 4;
+constexpr size_t kSmallSize = kInlined / 2;
+constexpr size_t kLargeSize = kInlined * 2;
+
+using Thrower = testing::ThrowingValue<>;
+using ThrowerAlloc = testing::ThrowingAllocator<Thrower>;
+
+template <typename Allocator = std::allocator<Thrower>>
+using InlVec = absl::InlinedVector<Thrower, kInlined, Allocator>;
+
+TEST(InlinedVector, DefaultConstructor) {
+  testing::TestThrowingCtor<InlVec<>>();
+
+  testing::TestThrowingCtor<InlVec<ThrowerAlloc>>();
+}
+
+TEST(InlinedVector, AllocConstructor) {
+  auto alloc = std::allocator<Thrower>();
+  testing::TestThrowingCtor<InlVec<>>(alloc);
+
+  auto throw_alloc = ThrowerAlloc();
+  testing::TestThrowingCtor<InlVec<ThrowerAlloc>>(throw_alloc);
+}
+
+TEST(InlinedVector, Clear) {
+  auto small_vec = InlVec<>(kSmallSize);
+  EXPECT_TRUE(testing::TestNothrowOp([&]() { small_vec.clear(); }));
+
+  auto large_vec = InlVec<>(kLargeSize);
+  EXPECT_TRUE(testing::TestNothrowOp([&]() { large_vec.clear(); }));
+}
+
+}  // namespace
diff --git a/absl/container/internal/inlined_vector.h b/absl/container/internal/inlined_vector.h
index 6a5a75be1f20..4589ce0837a4 100644
--- a/absl/container/internal/inlined_vector.h
+++ b/absl/container/internal/inlined_vector.h
@@ -16,6 +16,7 @@
 #define ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_
 
 #include <cstddef>
+#include <cstring>
 #include <iterator>
 #include <memory>
 #include <utility>
@@ -31,6 +32,33 @@ using IsAtLeastForwardIterator = std::is_convertible<
     typename std::iterator_traits<Iterator>::iterator_category,
     std::forward_iterator_tag>;
 
+template <typename AllocatorType, typename ValueType, typename SizeType>
+void DestroyElements(AllocatorType alloc, ValueType* destroy_first,
+                     SizeType destroy_size) {
+  using AllocatorTraits = std::allocator_traits<AllocatorType>;
+
+  // Destroys `destroy_size` elements from `destroy_first`.
+  //
+  // Destroys the range
+  //   [`destroy_first`, `destroy_first + destroy_size`).
+  //
+  // NOTE: We assume destructors do not throw and thus make no attempt to roll
+  // back.
+  for (SizeType i = 0; i < destroy_size; ++i) {
+    AllocatorTraits::destroy(alloc, destroy_first + i);
+  }
+
+#ifndef NDEBUG
+  // Overwrite unused memory with `0xab` so we can catch uninitialized usage.
+  //
+  // Cast to `void*` to tell the compiler that we don't care that we might be
+  // scribbling on a vtable pointer.
+  void* memory = reinterpret_cast<void*>(destroy_first);
+  size_t memory_size = sizeof(ValueType) * destroy_size;
+  std::memset(memory, 0xab, memory_size);
+#endif  // NDEBUG
+}
+
 template <typename T, size_t N, typename A>
 class Storage {
  public: