kc3-lang/angle/src/common/MemoryBuffer_unittest.cpp

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• Hash : b3af2e86
  Author :
  Date : 2024-12-31T08:51:37
  

  Enhance MemoryBuffer API
  
  Add support for -
  1. reserve - users can reserve sufficient capacity upfront to
               minimize subsequent reallocations due to resize
  2. append - to append data from a source so user doesn't need to
              track offsets explicitly
  
  Bug: angleproject:386749841
  Tests: MemoryBufferTest*
  Change-Id: Ibf2a3228d5a00ed34a7e0c5e3eb185e42677d676
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6135238
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: mohan maiya <m.maiya@samsung.com>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/common/MemoryBuffer_unittest.cpp

• //
  // Copyright 2025 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // Unit tests for ANGLE's MemoryBuffer class.
  //
  
  #include "common/MemoryBuffer.h"
  
  #include <gtest/gtest.h>
  
  using namespace angle;
  
  namespace
  {
  
  // Test usage of MemoryBuffer with multiple resizes
  TEST(MemoryBufferTest, MultipleResizes)
  {
      MemoryBuffer buffer;
  
      ASSERT_TRUE(buffer.resize(100));
      ASSERT_EQ(buffer.size(), 100u);
      buffer.assertTotalAllocatedBytes(100u);
      buffer.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(buffer.resize(300));
      ASSERT_EQ(buffer.size(), 300u);
      buffer.assertTotalAllocatedBytes(400u);
      buffer.assertTotalCopiedBytes(100u);
  
      ASSERT_TRUE(buffer.resize(100));
      ASSERT_EQ(buffer.size(), 100u);
      buffer.assertTotalAllocatedBytes(400u);
      buffer.assertTotalCopiedBytes(100u);
  
      ASSERT_TRUE(buffer.resize(400));
      ASSERT_EQ(buffer.size(), 400u);
      buffer.assertTotalAllocatedBytes(800u);
      buffer.assertTotalCopiedBytes(200u);
  }
  
  // Test usage of MemoryBuffer with reserve and then multiple resizes
  TEST(MemoryBufferTest, ReserveThenResize)
  {
      MemoryBuffer buffer;
  
      ASSERT_TRUE(buffer.reserve(300));
      ASSERT_EQ(buffer.size(), 0u);
  
      ASSERT_TRUE(buffer.resize(100));
      ASSERT_EQ(buffer.size(), 100u);
      buffer.assertTotalAllocatedBytes(300u);
      buffer.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(buffer.resize(300));
      ASSERT_EQ(buffer.size(), 300u);
      buffer.assertTotalAllocatedBytes(300u);
      buffer.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(buffer.resize(100));
      ASSERT_EQ(buffer.size(), 100u);
      buffer.assertTotalAllocatedBytes(300u);
      buffer.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(buffer.resize(400));
      ASSERT_EQ(buffer.size(), 400u);
      buffer.assertTotalAllocatedBytes(700u);
      buffer.assertTotalCopiedBytes(100u);
  }
  
  // Test usage of MemoryBuffer with clearAndReserve and then multiple resizes
  TEST(MemoryBufferTest, ClearAndReserveThenResize)
  {
      MemoryBuffer buffer;
  
      ASSERT_TRUE(buffer.clearAndReserve(300));
      ASSERT_EQ(buffer.size(), 0u);
  
      ASSERT_TRUE(buffer.resize(100));
      ASSERT_EQ(buffer.size(), 100u);
      buffer.assertTotalAllocatedBytes(300u);
      buffer.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(buffer.resize(300));
      ASSERT_EQ(buffer.size(), 300u);
      buffer.assertTotalAllocatedBytes(300u);
      buffer.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(buffer.resize(100));
      ASSERT_EQ(buffer.size(), 100u);
      buffer.assertTotalAllocatedBytes(300u);
      buffer.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(buffer.clearAndReserve(400));
      ASSERT_EQ(buffer.size(), 0u);
  
      ASSERT_TRUE(buffer.resize(400));
      ASSERT_EQ(buffer.size(), 400u);
      buffer.assertTotalAllocatedBytes(700u);
      buffer.assertTotalCopiedBytes(0u);
  }
  
  // Test appending and destroying MemoryBuffer
  TEST(MemoryBufferTest, AppendAndDestroy)
  {
      MemoryBuffer bufferSrc;
      MemoryBuffer bufferDst;
  
      ASSERT_TRUE(bufferSrc.clearAndReserve(100));
      ASSERT_EQ(bufferSrc.size(), 0u);
  
      ASSERT_TRUE(bufferSrc.resize(100));
      ASSERT_EQ(bufferSrc.size(), 100u);
      bufferSrc.assertTotalAllocatedBytes(100u);
      bufferSrc.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(bufferDst.clearAndReserve(200));
      ASSERT_EQ(bufferDst.size(), 0u);
  
      ASSERT_TRUE(bufferDst.resize(100));
      ASSERT_EQ(bufferDst.size(), 100u);
      ASSERT_TRUE(bufferDst.append(bufferSrc));
      ASSERT_EQ(bufferDst.size(), 200u);
      bufferDst.assertTotalAllocatedBytes(200u);
      bufferDst.assertTotalCopiedBytes(0u);
  
      ASSERT_TRUE(bufferDst.append(bufferSrc));
      ASSERT_EQ(bufferDst.size(), 300u);
      bufferDst.assertTotalAllocatedBytes(500u);
      bufferDst.assertTotalCopiedBytes(200u);
  
      ASSERT_TRUE(bufferDst.append(bufferDst));
      ASSERT_EQ(bufferDst.size(), 600u);
      bufferDst.assertTotalAllocatedBytes(1100u);
      bufferDst.assertTotalCopiedBytes(500u);
  
      bufferDst.destroy();
      ASSERT_EQ(bufferDst.size(), 0u);
      bufferDst.assertTotalAllocatedBytes(0u);
      bufferDst.assertTotalCopiedBytes(0u);
  }
  
  }  // namespace
  

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