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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/edk/embedder/simple_platform_shared_buffer.h"
#include <limits>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace mojo {
namespace embedder {
namespace {
TEST(SimplePlatformSharedBufferTest, Basic) {
const size_t kNumInts = 100;
const size_t kNumBytes = kNumInts * sizeof(int);
// A fudge so that we're not just writing zero bytes 75% of the time.
const int kFudge = 1234567890;
// Make some memory.
scoped_refptr<SimplePlatformSharedBuffer> buffer(
SimplePlatformSharedBuffer::Create(kNumBytes));
ASSERT_TRUE(buffer);
// Map it all, scribble some stuff, and then unmap it.
{
EXPECT_TRUE(buffer->IsValidMap(0, kNumBytes));
scoped_ptr<PlatformSharedBufferMapping> mapping(buffer->Map(0, kNumBytes));
ASSERT_TRUE(mapping);
ASSERT_TRUE(mapping->GetBase());
int* stuff = static_cast<int*>(mapping->GetBase());
for (size_t i = 0; i < kNumInts; i++)
stuff[i] = static_cast<int>(i) + kFudge;
}
// Map it all again, check that our scribbling is still there, then do a
// partial mapping and scribble on that, check that everything is coherent,
// unmap the first mapping, scribble on some of the second mapping, and then
// unmap it.
{
ASSERT_TRUE(buffer->IsValidMap(0, kNumBytes));
// Use |MapNoCheck()| this time.
scoped_ptr<PlatformSharedBufferMapping> mapping1(
buffer->MapNoCheck(0, kNumBytes));
ASSERT_TRUE(mapping1);
ASSERT_TRUE(mapping1->GetBase());
int* stuff1 = static_cast<int*>(mapping1->GetBase());
for (size_t i = 0; i < kNumInts; i++)
EXPECT_EQ(static_cast<int>(i) + kFudge, stuff1[i]) << i;
scoped_ptr<PlatformSharedBufferMapping> mapping2(
buffer->Map((kNumInts / 2) * sizeof(int), 2 * sizeof(int)));
ASSERT_TRUE(mapping2);
ASSERT_TRUE(mapping2->GetBase());
int* stuff2 = static_cast<int*>(mapping2->GetBase());
EXPECT_EQ(static_cast<int>(kNumInts / 2) + kFudge, stuff2[0]);
EXPECT_EQ(static_cast<int>(kNumInts / 2) + 1 + kFudge, stuff2[1]);
stuff2[0] = 123;
stuff2[1] = 456;
EXPECT_EQ(123, stuff1[kNumInts / 2]);
EXPECT_EQ(456, stuff1[kNumInts / 2 + 1]);
mapping1.reset();
EXPECT_EQ(123, stuff2[0]);
EXPECT_EQ(456, stuff2[1]);
stuff2[1] = 789;
}
// Do another partial mapping and check that everything is the way we expect
// it to be.
{
EXPECT_TRUE(buffer->IsValidMap(sizeof(int), kNumBytes - sizeof(int)));
scoped_ptr<PlatformSharedBufferMapping> mapping(
buffer->Map(sizeof(int), kNumBytes - sizeof(int)));
ASSERT_TRUE(mapping);
ASSERT_TRUE(mapping->GetBase());
int* stuff = static_cast<int*>(mapping->GetBase());
for (size_t j = 0; j < kNumInts - 1; j++) {
int i = static_cast<int>(j) + 1;
if (i == kNumInts / 2) {
EXPECT_EQ(123, stuff[j]);
} else if (i == kNumInts / 2 + 1) {
EXPECT_EQ(789, stuff[j]);
} else {
EXPECT_EQ(i + kFudge, stuff[j]) << i;
}
}
}
}
// TODO(vtl): Bigger buffers.
TEST(SimplePlatformSharedBufferTest, InvalidMappings) {
scoped_refptr<SimplePlatformSharedBuffer> buffer(
SimplePlatformSharedBuffer::Create(100));
ASSERT_TRUE(buffer);
// Zero length not allowed.
EXPECT_FALSE(buffer->Map(0, 0));
EXPECT_FALSE(buffer->IsValidMap(0, 0));
// Okay:
EXPECT_TRUE(buffer->Map(0, 100));
EXPECT_TRUE(buffer->IsValidMap(0, 100));
// Offset + length too big.
EXPECT_FALSE(buffer->Map(0, 101));
EXPECT_FALSE(buffer->IsValidMap(0, 101));
EXPECT_FALSE(buffer->Map(1, 100));
EXPECT_FALSE(buffer->IsValidMap(1, 100));
// Okay:
EXPECT_TRUE(buffer->Map(50, 50));
EXPECT_TRUE(buffer->IsValidMap(50, 50));
// Offset + length too big.
EXPECT_FALSE(buffer->Map(50, 51));
EXPECT_FALSE(buffer->IsValidMap(50, 51));
EXPECT_FALSE(buffer->Map(51, 50));
EXPECT_FALSE(buffer->IsValidMap(51, 50));
}
TEST(SimplePlatformSharedBufferTest, TooBig) {
// If |size_t| is 32-bit, it's quite possible/likely that |Create()| succeeds
// (since it only involves creating a 4 GB file).
const size_t kMaxSizeT = std::numeric_limits<size_t>::max();
scoped_refptr<SimplePlatformSharedBuffer> buffer(
SimplePlatformSharedBuffer::Create(kMaxSizeT));
// But, assuming |sizeof(size_t) == sizeof(void*)|, mapping all of it should
// always fail.
if (buffer)
EXPECT_FALSE(buffer->Map(0, kMaxSizeT));
}
// Tests that separate mappings get distinct addresses.
// Note: It's not inconceivable that the OS could ref-count identical mappings
// and reuse the same address, in which case we'd have to be more careful about
// using the address as the key for unmapping.
TEST(SimplePlatformSharedBufferTest, MappingsDistinct) {
scoped_refptr<SimplePlatformSharedBuffer> buffer(
SimplePlatformSharedBuffer::Create(100));
scoped_ptr<PlatformSharedBufferMapping> mapping1(buffer->Map(0, 100));
scoped_ptr<PlatformSharedBufferMapping> mapping2(buffer->Map(0, 100));
EXPECT_NE(mapping1->GetBase(), mapping2->GetBase());
}
TEST(SimplePlatformSharedBufferTest, BufferZeroInitialized) {
static const size_t kSizes[] = {10, 100, 1000, 10000, 100000};
for (size_t i = 0; i < arraysize(kSizes); i++) {
scoped_refptr<SimplePlatformSharedBuffer> buffer(
SimplePlatformSharedBuffer::Create(kSizes[i]));
scoped_ptr<PlatformSharedBufferMapping> mapping(buffer->Map(0, kSizes[i]));
for (size_t j = 0; j < kSizes[i]; j++) {
// "Assert" instead of "expect" so we don't spam the output with thousands
// of failures if we fail.
ASSERT_EQ('\0', static_cast<char*>(mapping->GetBase())[j])
<< "size " << kSizes[i] << ", offset " << j;
}
}
}
TEST(SimplePlatformSharedBufferTest, MappingsOutliveBuffer) {
scoped_ptr<PlatformSharedBufferMapping> mapping1;
scoped_ptr<PlatformSharedBufferMapping> mapping2;
{
scoped_refptr<SimplePlatformSharedBuffer> buffer(
SimplePlatformSharedBuffer::Create(100));
mapping1 = buffer->Map(0, 100).Pass();
mapping2 = buffer->Map(50, 50).Pass();
static_cast<char*>(mapping1->GetBase())[50] = 'x';
}
EXPECT_EQ('x', static_cast<char*>(mapping2->GetBase())[0]);
static_cast<char*>(mapping2->GetBase())[1] = 'y';
EXPECT_EQ('y', static_cast<char*>(mapping1->GetBase())[51]);
}
} // namespace
} // namespace embedder
} // namespace mojo
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