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-rw-r--r--mfbt/tests/TestBufferList.cpp372
1 files changed, 372 insertions, 0 deletions
diff --git a/mfbt/tests/TestBufferList.cpp b/mfbt/tests/TestBufferList.cpp
new file mode 100644
index 0000000000..9c0d69d7d6
--- /dev/null
+++ b/mfbt/tests/TestBufferList.cpp
@@ -0,0 +1,372 @@
+/* -*- Mode: C++; tab-width: 9; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This is included first to ensure it doesn't implicitly depend on anything
+// else.
+#include "mozilla/BufferList.h"
+
+// It would be nice if we could use the InfallibleAllocPolicy from mozalloc,
+// but MFBT cannot use mozalloc.
+class InfallibleAllocPolicy {
+ public:
+ template <typename T>
+ T* pod_malloc(size_t aNumElems) {
+ if (aNumElems & mozilla::tl::MulOverflowMask<sizeof(T)>::value) {
+ MOZ_CRASH("TestBufferList.cpp: overflow");
+ }
+ T* rv = static_cast<T*>(malloc(aNumElems * sizeof(T)));
+ if (!rv) {
+ MOZ_CRASH("TestBufferList.cpp: out of memory");
+ }
+ return rv;
+ }
+
+ template <typename T>
+ void free_(T* aPtr, size_t aNumElems = 0) {
+ free(aPtr);
+ }
+
+ void reportAllocOverflow() const {}
+
+ bool checkSimulatedOOM() const { return true; }
+};
+
+typedef mozilla::BufferList<InfallibleAllocPolicy> BufferList;
+
+int main(void) {
+ const size_t kInitialSize = 16;
+ const size_t kInitialCapacity = 24;
+ const size_t kStandardCapacity = 32;
+
+ BufferList bl(kInitialSize, kInitialCapacity, kStandardCapacity);
+
+ memset(bl.Start(), 0x0c, kInitialSize);
+ MOZ_RELEASE_ASSERT(bl.Size() == kInitialSize);
+
+ // Simple iteration and access.
+
+ BufferList::IterImpl iter(bl.Iter());
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() == kInitialSize);
+ MOZ_RELEASE_ASSERT(iter.HasRoomFor(kInitialSize));
+ MOZ_RELEASE_ASSERT(!iter.HasRoomFor(kInitialSize + 1));
+ MOZ_RELEASE_ASSERT(!iter.HasRoomFor(size_t(-1)));
+ MOZ_RELEASE_ASSERT(*iter.Data() == 0x0c);
+ MOZ_RELEASE_ASSERT(!iter.Done());
+
+ iter.Advance(bl, 4);
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() == kInitialSize - 4);
+ MOZ_RELEASE_ASSERT(iter.HasRoomFor(kInitialSize - 4));
+ MOZ_RELEASE_ASSERT(*iter.Data() == 0x0c);
+ MOZ_RELEASE_ASSERT(!iter.Done());
+
+ iter.Advance(bl, 11);
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() == kInitialSize - 4 - 11);
+ MOZ_RELEASE_ASSERT(iter.HasRoomFor(kInitialSize - 4 - 11));
+ MOZ_RELEASE_ASSERT(!iter.HasRoomFor(kInitialSize - 4 - 11 + 1));
+ MOZ_RELEASE_ASSERT(*iter.Data() == 0x0c);
+ MOZ_RELEASE_ASSERT(!iter.Done());
+
+ iter.Advance(bl, kInitialSize - 4 - 11);
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() == 0);
+ MOZ_RELEASE_ASSERT(!iter.HasRoomFor(1));
+ MOZ_RELEASE_ASSERT(iter.Done());
+
+ // Writing to the buffer.
+
+ const size_t kSmallWrite = 16;
+
+ char toWrite[kSmallWrite];
+ memset(toWrite, 0x0a, kSmallWrite);
+ MOZ_ALWAYS_TRUE(bl.WriteBytes(toWrite, kSmallWrite));
+
+ MOZ_RELEASE_ASSERT(bl.Size() == kInitialSize + kSmallWrite);
+
+ iter = bl.Iter();
+ iter.Advance(bl, kInitialSize);
+ MOZ_RELEASE_ASSERT(!iter.Done());
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() ==
+ kInitialCapacity - kInitialSize);
+ MOZ_RELEASE_ASSERT(iter.HasRoomFor(kInitialCapacity - kInitialSize));
+ MOZ_RELEASE_ASSERT(*iter.Data() == 0x0a);
+
+ // AdvanceAcrossSegments.
+
+ iter = bl.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl, kInitialCapacity - 4));
+ MOZ_RELEASE_ASSERT(!iter.Done());
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() == 4);
+ MOZ_RELEASE_ASSERT(iter.HasRoomFor(4));
+ MOZ_RELEASE_ASSERT(*iter.Data() == 0x0a);
+
+ iter = bl.Iter();
+ MOZ_RELEASE_ASSERT(
+ iter.AdvanceAcrossSegments(bl, kInitialSize + kSmallWrite - 4));
+ MOZ_RELEASE_ASSERT(!iter.Done());
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() == 4);
+ MOZ_RELEASE_ASSERT(iter.HasRoomFor(4));
+ MOZ_RELEASE_ASSERT(*iter.Data() == 0x0a);
+
+ MOZ_RELEASE_ASSERT(
+ bl.Iter().AdvanceAcrossSegments(bl, kInitialSize + kSmallWrite - 1));
+ MOZ_RELEASE_ASSERT(
+ bl.Iter().AdvanceAcrossSegments(bl, kInitialSize + kSmallWrite));
+ MOZ_RELEASE_ASSERT(
+ !bl.Iter().AdvanceAcrossSegments(bl, kInitialSize + kSmallWrite + 1));
+ MOZ_RELEASE_ASSERT(!bl.Iter().AdvanceAcrossSegments(bl, size_t(-1)));
+
+ // Reading non-contiguous bytes.
+
+ char toRead[kSmallWrite];
+ iter = bl.Iter();
+ iter.Advance(bl, kInitialSize);
+ bl.ReadBytes(iter, toRead, kSmallWrite);
+ MOZ_RELEASE_ASSERT(memcmp(toRead, toWrite, kSmallWrite) == 0);
+ MOZ_RELEASE_ASSERT(iter.Done());
+
+ // Make sure reading up to the end of a segment advances the iter to the next
+ // segment.
+ iter = bl.Iter();
+ bl.ReadBytes(iter, toRead, kInitialSize);
+ MOZ_RELEASE_ASSERT(!iter.Done());
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() ==
+ kInitialCapacity - kInitialSize);
+
+ const size_t kBigWrite = 1024;
+
+ char* toWriteBig = static_cast<char*>(malloc(kBigWrite));
+ for (unsigned i = 0; i < kBigWrite; i++) {
+ toWriteBig[i] = i % 37;
+ }
+ MOZ_ALWAYS_TRUE(bl.WriteBytes(toWriteBig, kBigWrite));
+
+ char* toReadBig = static_cast<char*>(malloc(kBigWrite));
+ iter = bl.Iter();
+ MOZ_RELEASE_ASSERT(
+ iter.AdvanceAcrossSegments(bl, kInitialSize + kSmallWrite));
+ bl.ReadBytes(iter, toReadBig, kBigWrite);
+ MOZ_RELEASE_ASSERT(memcmp(toReadBig, toWriteBig, kBigWrite) == 0);
+ MOZ_RELEASE_ASSERT(iter.Done());
+
+ free(toReadBig);
+ free(toWriteBig);
+
+ // Currently bl contains these segments:
+ // #0: offset 0, [0x0c]*16 + [0x0a]*8, size 24
+ // #1: offset 24, [0x0a]*8 + [i%37 for i in 0..24], size 32
+ // #2: offset 56, [i%37 for i in 24..56, size 32
+ // ...
+ // #32: offset 1016, [i%37 for i in 984..1016], size 32
+ // #33: offset 1048, [i%37 for i in 1016..1024], size 8
+
+ static size_t kTotalSize = kInitialSize + kSmallWrite + kBigWrite;
+
+ MOZ_RELEASE_ASSERT(bl.Size() == kTotalSize);
+
+ static size_t kLastSegmentSize =
+ (kTotalSize - kInitialCapacity) % kStandardCapacity;
+
+ iter = bl.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(
+ bl, kTotalSize - kLastSegmentSize - kStandardCapacity));
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() == kStandardCapacity);
+ iter.Advance(bl, kStandardCapacity);
+ MOZ_RELEASE_ASSERT(iter.RemainingInSegment() == kLastSegmentSize);
+ MOZ_RELEASE_ASSERT(
+ unsigned(*iter.Data()) ==
+ (kTotalSize - kLastSegmentSize - kInitialSize - kSmallWrite) % 37);
+
+ // Clear.
+
+ bl.Clear();
+ MOZ_RELEASE_ASSERT(bl.Size() == 0);
+ MOZ_RELEASE_ASSERT(bl.Iter().Done());
+
+ // Move assignment.
+
+ const size_t kSmallCapacity = 8;
+
+ BufferList bl2(0, kSmallCapacity, kSmallCapacity);
+ MOZ_ALWAYS_TRUE(bl2.WriteBytes(toWrite, kSmallWrite));
+ MOZ_ALWAYS_TRUE(bl2.WriteBytes(toWrite, kSmallWrite));
+ MOZ_ALWAYS_TRUE(bl2.WriteBytes(toWrite, kSmallWrite));
+
+ bl = std::move(bl2);
+ MOZ_RELEASE_ASSERT(bl2.Size() == 0);
+ MOZ_RELEASE_ASSERT(bl2.Iter().Done());
+
+ iter = bl.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl, kSmallWrite * 3));
+ MOZ_RELEASE_ASSERT(iter.Done());
+
+ // MoveFallible
+
+ bool success;
+ bl2 = bl.MoveFallible<InfallibleAllocPolicy>(&success);
+ MOZ_RELEASE_ASSERT(success);
+ MOZ_RELEASE_ASSERT(bl.Size() == 0);
+ MOZ_RELEASE_ASSERT(bl.Iter().Done());
+ MOZ_RELEASE_ASSERT(bl2.Size() == kSmallWrite * 3);
+
+ iter = bl2.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl2, kSmallWrite * 3));
+ MOZ_RELEASE_ASSERT(iter.Done());
+
+ bl = bl2.MoveFallible<InfallibleAllocPolicy>(&success);
+
+ // Borrowing.
+
+ const size_t kBorrowStart = 4;
+ const size_t kBorrowSize = 24;
+
+ iter = bl.Iter();
+ iter.Advance(bl, kBorrowStart);
+ bl2 = bl.Borrow<InfallibleAllocPolicy>(iter, kBorrowSize, &success);
+ MOZ_RELEASE_ASSERT(success);
+ MOZ_RELEASE_ASSERT(bl2.Size() == kBorrowSize);
+
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(
+ bl, kSmallWrite * 3 - kBorrowSize - kBorrowStart));
+ MOZ_RELEASE_ASSERT(iter.Done());
+
+ iter = bl2.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl2, kBorrowSize));
+ MOZ_RELEASE_ASSERT(iter.Done());
+
+ BufferList::IterImpl iter1(bl.Iter()), iter2(bl2.Iter());
+ iter1.Advance(bl, kBorrowStart);
+ MOZ_RELEASE_ASSERT(iter1.Data() == iter2.Data());
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl, kBorrowSize - 5));
+ MOZ_RELEASE_ASSERT(iter2.AdvanceAcrossSegments(bl2, kBorrowSize - 5));
+ MOZ_RELEASE_ASSERT(iter1.Data() == iter2.Data());
+
+ // RangeLength.
+
+ BufferList bl12(0, 0, 8);
+ MOZ_ALWAYS_TRUE(bl12.WriteBytes("abcdefgh", 8));
+ MOZ_ALWAYS_TRUE(bl12.WriteBytes("12345678", 8));
+
+ // |iter| is at position 0 (1st segment).
+ iter = bl12.Iter();
+ iter1 = bl12.Iter();
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 0);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 4));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 4);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 4));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 8);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 4));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 12);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 3));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 15);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 1));
+ MOZ_RELEASE_ASSERT(iter1.Done());
+
+ // |iter| is at position 1 (1st segment).
+ iter = bl12.Iter();
+ iter1 = bl12.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl12, 1));
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 1));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 0);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 4));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 4);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 4));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 8);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 4));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 12);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 2));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 14);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 1));
+ MOZ_RELEASE_ASSERT(iter1.Done());
+
+ // |iter| is at position 8 (2nd segment).
+ iter = bl12.Iter();
+ iter1 = bl12.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl12, 8));
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 8));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 0);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 4));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 4);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 3));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 7);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 1));
+ MOZ_RELEASE_ASSERT(iter1.Done());
+
+ // |iter| is at position 9 (2nd segment).
+ iter = bl12.Iter();
+ iter1 = bl12.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl12, 9));
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 9));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 0);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 4));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 4);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 2));
+ MOZ_RELEASE_ASSERT(bl12.RangeLength(iter, iter1) == 6);
+ MOZ_RELEASE_ASSERT(iter1.AdvanceAcrossSegments(bl12, 1));
+ MOZ_RELEASE_ASSERT(iter1.Done());
+
+ BufferList bl13(0, 0, 8);
+ MOZ_ALWAYS_TRUE(bl13.WriteBytes("abcdefgh", 8));
+ MOZ_ALWAYS_TRUE(bl13.WriteBytes("12345678", 8));
+ MOZ_ALWAYS_TRUE(bl13.WriteBytes("ABCDEFGH", 8));
+ MOZ_RELEASE_ASSERT(bl13.Size() == 24);
+
+ // At segment border
+ iter = bl13.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl13, 8));
+ MOZ_RELEASE_ASSERT(bl13.Truncate(iter) == 16);
+ MOZ_RELEASE_ASSERT(iter.Done());
+ MOZ_RELEASE_ASSERT(bl13.Size() == 8);
+
+ // Restore state
+ MOZ_ALWAYS_TRUE(bl13.WriteBytes("12345678", 8));
+ MOZ_ALWAYS_TRUE(bl13.WriteBytes("ABCDEFGH", 8));
+ MOZ_RELEASE_ASSERT(bl13.Size() == 24);
+
+ // Before segment border
+ iter = bl13.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl13, 7));
+ MOZ_RELEASE_ASSERT(bl13.Truncate(iter) == 17);
+ MOZ_RELEASE_ASSERT(iter.Done());
+ MOZ_RELEASE_ASSERT(bl13.Size() == 7);
+
+ // Restore state
+ MOZ_ALWAYS_TRUE(bl13.WriteBytes("h", 1));
+ MOZ_ALWAYS_TRUE(bl13.WriteBytes("12345678", 8));
+ MOZ_ALWAYS_TRUE(bl13.WriteBytes("ABCDEFGH", 8));
+ MOZ_RELEASE_ASSERT(bl13.Size() == 24);
+
+ // In last segment
+ iter = bl13.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl13, 20));
+ MOZ_RELEASE_ASSERT(bl13.Truncate(iter) == 4);
+ MOZ_RELEASE_ASSERT(iter.Done());
+ MOZ_RELEASE_ASSERT(bl13.Size() == 20);
+
+ // No-op truncate
+ MOZ_RELEASE_ASSERT(bl13.Truncate(iter) == 0);
+ MOZ_RELEASE_ASSERT(iter.Done());
+ MOZ_RELEASE_ASSERT(bl13.Size() == 20);
+
+ // No-op truncate with fresh iterator
+ iter = bl13.Iter();
+ MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(bl13, 20));
+ MOZ_RELEASE_ASSERT(bl13.Truncate(iter) == 0);
+ MOZ_RELEASE_ASSERT(iter.Done());
+ MOZ_RELEASE_ASSERT(bl13.Size() == 20);
+
+ // Truncate at start of buffer
+ iter = bl13.Iter();
+ MOZ_RELEASE_ASSERT(bl13.Truncate(iter) == 20);
+ MOZ_RELEASE_ASSERT(iter.Done());
+ MOZ_RELEASE_ASSERT(bl13.Size() == 0);
+
+ // No-op truncate at start of buffer
+ iter = bl13.Iter();
+ MOZ_RELEASE_ASSERT(bl13.Truncate(iter) == 0);
+ MOZ_RELEASE_ASSERT(iter.Done());
+ MOZ_RELEASE_ASSERT(bl13.Size() == 0);
+
+ return 0;
+}
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