Add MinidumpMemoryWriter, MinidumpMemoryListWriter, and their test

minidump/minidump_memory_writer_test.cc

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// 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
+//
+//     http://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 "minidump/minidump_memory_writer.h"
+
+#include <dbghelp.h>
+#include <stdint.h>
+
+#include "base/basictypes.h"
+#include "gtest/gtest.h"
+#include "minidump/minidump_file_writer.h"
+#include "minidump/minidump_stream_writer.h"
+#include "util/file/string_file_writer.h"
+
+namespace {
+
+using namespace crashpad;
+
+const MinidumpStreamType kBogusStreamType = static_cast<MinidumpStreamType>(1234);
+
+// expected_streams is the expected number of streams in the file. The memory
+// list must be the last stream. If there is another stream, it must come first,
+// have stream type kBogusStreamType, and have zero-length data.
+void GetMemoryListStream(const std::string& file_contents,
+                         const MINIDUMP_MEMORY_LIST** memory_list,
+                         const uint32_t expected_streams) {
+  const size_t kDirectoryOffset = sizeof(MINIDUMP_HEADER);
+  const size_t kMemoryListStreamOffset =
+      kDirectoryOffset + expected_streams * sizeof(MINIDUMP_DIRECTORY);
+  const size_t kMemoryDescriptorsOffset =
+      kMemoryListStreamOffset + sizeof(MINIDUMP_MEMORY_LIST);
+
+  ASSERT_GE(file_contents.size(), kMemoryDescriptorsOffset);
+
+  const MINIDUMP_HEADER* header =
+      reinterpret_cast<const MINIDUMP_HEADER*>(&file_contents[0]);
+
+  EXPECT_EQ(static_cast<uint32_t>(MINIDUMP_SIGNATURE), header->Signature);

[Robert Sesek, 2014/08/11 22:23:59]

This code gets repeated a lot in other tests. Perhaps a function to compare (the
interesting fields of) MINIDUMP_HEADERs?

+  EXPECT_EQ(static_cast<uint32_t>(MINIDUMP_VERSION), header->Version);
+  ASSERT_EQ(expected_streams, header->NumberOfStreams);
+  ASSERT_EQ(kDirectoryOffset, header->StreamDirectoryRva);
+  EXPECT_EQ(0u, header->CheckSum);
+  EXPECT_EQ(0u, header->TimeDateStamp);
+  EXPECT_EQ(MiniDumpNormal, header->Flags);
+
+  const MINIDUMP_DIRECTORY* directory =
+      reinterpret_cast<const MINIDUMP_DIRECTORY*>(
+          &file_contents[kDirectoryOffset]);
+
+  if (expected_streams > 1) {
+    ASSERT_EQ(kBogusStreamType, directory->StreamType);
+    ASSERT_EQ(0u, directory->Location.DataSize);
+    ASSERT_EQ(kMemoryListStreamOffset, directory->Location.Rva);
+    ++directory;
+  }
+
+  ASSERT_EQ(kMinidumpStreamTypeMemoryList, directory->StreamType);
+  ASSERT_GE(directory->Location.DataSize, sizeof(MINIDUMP_MEMORY_LIST));
+  ASSERT_EQ(kMemoryListStreamOffset, directory->Location.Rva);
+
+  *memory_list = reinterpret_cast<const MINIDUMP_MEMORY_LIST*>(
+      &file_contents[kMemoryListStreamOffset]);
+
+  ASSERT_EQ(sizeof(MINIDUMP_MEMORY_LIST) +
+                (*memory_list)->NumberOfMemoryRanges *
+                    sizeof(MINIDUMP_MEMORY_DESCRIPTOR),
+            directory->Location.DataSize);
+}
+
+TEST(MinidumpMemoryWriter, EmptyMemoryList) {
+  MinidumpFileWriter minidump_file_writer;
+  MinidumpMemoryListWriter memory_list_writer;
+
+  minidump_file_writer.AddStream(&memory_list_writer);
+
+  StringFileWriter file_writer;
+  ASSERT_TRUE(minidump_file_writer.WriteEverything(&file_writer));
+
+  ASSERT_EQ(sizeof(MINIDUMP_HEADER) + sizeof(MINIDUMP_DIRECTORY) +
+                sizeof(MINIDUMP_MEMORY_LIST),
+            file_writer.string().size());
+
+  const MINIDUMP_MEMORY_LIST* memory_list;
+  GetMemoryListStream(file_writer.string(), &memory_list, 1);
+  if (Test::HasFatalFailure()) {
+    return;
+  }
+
+  EXPECT_EQ(0u, memory_list->NumberOfMemoryRanges);
+}
+
+class TestMemoryWriter final : public MinidumpMemoryWriter {
+ public:
+  TestMemoryWriter(uint64_t base_address, size_t size, uint8_t value)
+      : MinidumpMemoryWriter(),
+        base_address_(base_address),
+        expected_offset_(-1),
+        size_(size),
+        value_(value) {}
+
+  ~TestMemoryWriter() {}
+
+ protected:
+  // MinidumpWritable:
+  virtual bool WillWriteAtOffsetImpl(off_t offset) override {
+    EXPECT_EQ(state(), kStateFrozen);
+    expected_offset_ = offset;
+    bool rv = MinidumpMemoryWriter::WillWriteAtOffsetImpl(offset);
+    EXPECT_TRUE(rv);
+    return rv;
+  }
+
+  virtual bool WriteObject(FileWriterInterface* file_writer) override {
+    EXPECT_EQ(state(), kStateWritable);
+    EXPECT_EQ(expected_offset_, file_writer->Seek(0, SEEK_CUR));
+
+    bool rv = true;
+    if (size_ > 0) {
+      std::string data(size_, value_);
+      rv = file_writer->Write(&data[0], size_);
+      EXPECT_TRUE(rv);
+    }
+
+    return true;

[Robert Sesek, 2014/08/11 22:23:59]

return rv?

+  }
+
+  // MinidumpMemoryWriter:
+  virtual uint64_t MemoryRangeBaseAddress() const override {
+    EXPECT_EQ(state(), kStateFrozen);
+    return base_address_;
+  }
+
+  virtual size_t MemoryRangeSize() const override {
+    EXPECT_GE(state(), kStateFrozen);
+    return size_;
+  }
+
+ private:
+  uint64_t base_address_;
+  off_t expected_offset_;
+  size_t size_;
+  uint8_t value_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestMemoryWriter);
+};
+
+TEST(MinidumpMemoryWriter, OneMemoryRegion) {
+  MinidumpFileWriter minidump_file_writer;
+  MinidumpMemoryListWriter memory_list_writer;
+
+  const uint64_t kBaseAddress = 0xfedcba9876543210ull;
+  const uint64_t kSize = 0x1000;
+  const uint8_t kValue = 'm';
+
+  TestMemoryWriter memory_writer(kBaseAddress, kSize, kValue);
+  memory_list_writer.AddMemory(&memory_writer);
+
+  minidump_file_writer.AddStream(&memory_list_writer);
+
+  StringFileWriter file_writer;
+  ASSERT_TRUE(minidump_file_writer.WriteEverything(&file_writer));
+
+  const MINIDUMP_MEMORY_LIST* memory_list;
+  GetMemoryListStream(file_writer.string(), &memory_list, 1);
+  if (Test::HasFatalFailure()) {
+    return;
+  }
+
+  EXPECT_EQ(1u, memory_list->NumberOfMemoryRanges);
+  EXPECT_EQ(kBaseAddress, memory_list->MemoryRanges[0].StartOfMemoryRange);
+  EXPECT_EQ(kSize, memory_list->MemoryRanges[0].Memory.DataSize);
+  EXPECT_LT(memory_list->MemoryRanges[0].Memory.Rva -
+                (sizeof(MINIDUMP_HEADER) + sizeof(MINIDUMP_DIRECTORY) +
+                 sizeof(MINIDUMP_MEMORY_LIST) +
+                 memory_list->NumberOfMemoryRanges *
+                     sizeof(MINIDUMP_MEMORY_DESCRIPTOR)),
+            16u);
+  EXPECT_EQ(0u, memory_list->MemoryRanges[0].Memory.Rva % 16);
+  EXPECT_EQ(file_writer.string().size(),
+            memory_list->MemoryRanges[0].Memory.Rva +
+                memory_list->MemoryRanges[0].Memory.DataSize);
+
+  std::string expected_data(kSize, kValue);
+  std::string observed_data(
+      &file_writer.string()[memory_list->MemoryRanges[0].Memory.Rva],
+      memory_list->MemoryRanges[0].Memory.DataSize);
+  EXPECT_EQ(expected_data, observed_data);
+}
+
+TEST(MinidumpMemoryWriter, TwoMemoryRegions) {
+  MinidumpFileWriter minidump_file_writer;
+  MinidumpMemoryListWriter memory_list_writer;
+
+  const uint64_t kBaseAddress1 = 0x00c0ffeeull;
+  const uint64_t kSize1 = 0x0100;
+  const uint8_t kValue1 = '6';
+  const uint64_t kBaseAddress2 = 0xfac00facull;
+  const uint64_t kSize2 = 0x0200;
+  const uint8_t kValue2 = '!';
+
+  TestMemoryWriter memory_writer_1(kBaseAddress1, kSize1, kValue1);
+  memory_list_writer.AddMemory(&memory_writer_1);
+  TestMemoryWriter memory_writer_2(kBaseAddress2, kSize2, kValue2);
+  memory_list_writer.AddMemory(&memory_writer_2);
+
+  minidump_file_writer.AddStream(&memory_list_writer);
+
+  StringFileWriter file_writer;
+  ASSERT_TRUE(minidump_file_writer.WriteEverything(&file_writer));
+
+  const MINIDUMP_MEMORY_LIST* memory_list;
+  GetMemoryListStream(file_writer.string(), &memory_list, 1);
+  if (Test::HasFatalFailure()) {
+    return;
+  }
+
+  EXPECT_EQ(2u, memory_list->NumberOfMemoryRanges);
+
+  EXPECT_EQ(kBaseAddress1, memory_list->MemoryRanges[0].StartOfMemoryRange);
+  EXPECT_EQ(kSize1, memory_list->MemoryRanges[0].Memory.DataSize);
+  EXPECT_LT(memory_list->MemoryRanges[0].Memory.Rva -
+                (sizeof(MINIDUMP_HEADER) + sizeof(MINIDUMP_DIRECTORY) +
+                 sizeof(MINIDUMP_MEMORY_LIST) +
+                 memory_list->NumberOfMemoryRanges *
+                     sizeof(MINIDUMP_MEMORY_DESCRIPTOR)),
+            16u);
+  EXPECT_EQ(0u, memory_list->MemoryRanges[0].Memory.Rva % 16);
+  EXPECT_LE(memory_list->MemoryRanges[0].Memory.Rva +
+                memory_list->MemoryRanges[0].Memory.DataSize,
+            file_writer.string().size());
+
+  std::string expected_data(kSize1, kValue1);
+  std::string observed_data(
+      &file_writer.string()[memory_list->MemoryRanges[0].Memory.Rva],
+      memory_list->MemoryRanges[0].Memory.DataSize);
+  EXPECT_EQ(expected_data, observed_data);
+
+  EXPECT_EQ(kBaseAddress2, memory_list->MemoryRanges[1].StartOfMemoryRange);
+  EXPECT_EQ(kSize2, memory_list->MemoryRanges[1].Memory.DataSize);
+  EXPECT_LT(memory_list->MemoryRanges[1].Memory.Rva -
+                (memory_list->MemoryRanges[0].Memory.Rva +
+                 memory_list->MemoryRanges[0].Memory.DataSize),
+            16u);
+  EXPECT_EQ(0u, memory_list->MemoryRanges[1].Memory.Rva % 16);
+  EXPECT_EQ(file_writer.string().size(),
+            memory_list->MemoryRanges[1].Memory.Rva +
+                memory_list->MemoryRanges[1].Memory.DataSize);
+
+  expected_data.assign(kSize2, kValue2);
+  observed_data.assign(
+      &file_writer.string()[memory_list->MemoryRanges[1].Memory.Rva],
+      memory_list->MemoryRanges[1].Memory.DataSize);
+  EXPECT_EQ(expected_data, observed_data);
+}
+
+class TestMemoryStream final : public internal::MinidumpStreamWriter {
+ public:
+  TestMemoryStream(uint64_t base_address, size_t size, uint8_t value)
+      : MinidumpStreamWriter(),
+        memory_(base_address, size, value) {
+  }
+
+  ~TestMemoryStream() {
+  }
+
+  TestMemoryWriter* memory() { return &memory_; }
+
+  // MinidumpStreamWriter:
+  virtual MinidumpStreamType StreamType() const override {
+    return kBogusStreamType;
+  }
+
+ protected:
+  // MinidumpWritable:
+  virtual size_t SizeOfObject() override {
+    EXPECT_GE(state(), kStateFrozen);
+    return 0;
+  }
+
+  virtual std::vector<MinidumpWritable*> Children() override {
+    EXPECT_GE(state(), kStateFrozen);
+    std::vector<MinidumpWritable*> children(1, memory());
+    return children;
+  }
+
+  virtual bool WriteObject(FileWriterInterface* file_writer) override {
+    EXPECT_EQ(kStateWritable, state());
+    return true;
+  }
+
+ private:
+  TestMemoryWriter memory_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestMemoryStream);
+};
+
+TEST(MinidumpMemoryWriter, ExtraMemory) {
+  // This tests MinidumpMemoryListWriter::AddExtraMemory(). That method adds
+  // a MinidumpMemoryWriter to the MinidumpMemoryListWriter without making the
+  // memory writer a child of the memory list writer.
+  MinidumpFileWriter minidump_file_writer;
+
+  const uint64_t kBaseAddress1 = 0x0000000000001000ull;
+  const uint64_t kSize1 = 0x0400;
+  const uint8_t kValue1 = '1';
+  TestMemoryStream test_memory_stream(kBaseAddress1, kSize1, kValue1);
+
+  MinidumpMemoryListWriter memory_list_writer;
+  memory_list_writer.AddExtraMemory(test_memory_stream.memory());
+
+  minidump_file_writer.AddStream(&test_memory_stream);
+
+  const uint64_t kBaseAddress2 = 0x0000000000002000ull;
+  const uint64_t kSize2 = 0x0400;
+  const uint8_t kValue2 = 'm';
+
+  TestMemoryWriter memory_writer(kBaseAddress2, kSize2, kValue2);
+  memory_list_writer.AddMemory(&memory_writer);
+
+  minidump_file_writer.AddStream(&memory_list_writer);
+
+  StringFileWriter file_writer;
+  ASSERT_TRUE(minidump_file_writer.WriteEverything(&file_writer));
+
+  const MINIDUMP_MEMORY_LIST* memory_list;
+  GetMemoryListStream(file_writer.string(), &memory_list, 2);
+  if (Test::HasFatalFailure()) {
+    return;
+  }
+
+  EXPECT_EQ(2u, memory_list->NumberOfMemoryRanges);
+
+  EXPECT_EQ(kBaseAddress1, memory_list->MemoryRanges[0].StartOfMemoryRange);
+  EXPECT_EQ(kSize1, memory_list->MemoryRanges[0].Memory.DataSize);
+  EXPECT_LT(memory_list->MemoryRanges[0].Memory.Rva -
+                (sizeof(MINIDUMP_HEADER) + 2 * sizeof(MINIDUMP_DIRECTORY) +
+                 sizeof(MINIDUMP_MEMORY_LIST) +
+                 memory_list->NumberOfMemoryRanges *
+                     sizeof(MINIDUMP_MEMORY_DESCRIPTOR)),
+            16u);
+  EXPECT_EQ(0u, memory_list->MemoryRanges[0].Memory.Rva % 16);
+  EXPECT_LE(memory_list->MemoryRanges[0].Memory.Rva +
+                memory_list->MemoryRanges[0].Memory.DataSize,
+            file_writer.string().size());
+
+  std::string expected_data(kSize1, kValue1);
+  std::string observed_data(
+      &file_writer.string()[memory_list->MemoryRanges[0].Memory.Rva],
+      memory_list->MemoryRanges[0].Memory.DataSize);
+  EXPECT_EQ(expected_data, observed_data);
+
+  EXPECT_EQ(kBaseAddress2, memory_list->MemoryRanges[1].StartOfMemoryRange);
+  EXPECT_EQ(kSize2, memory_list->MemoryRanges[1].Memory.DataSize);
+  EXPECT_LT(memory_list->MemoryRanges[1].Memory.Rva -
+                (memory_list->MemoryRanges[0].Memory.Rva +
+                 memory_list->MemoryRanges[0].Memory.DataSize),
+            16u);
+  EXPECT_EQ(0u, memory_list->MemoryRanges[1].Memory.Rva % 16);

[Robert Sesek, 2014/08/11 22:23:59]

A small helper to verify that a MemoryRange is valid seems smart.

+  EXPECT_EQ(file_writer.string().size(),
+            memory_list->MemoryRanges[1].Memory.Rva +
+                memory_list->MemoryRanges[1].Memory.DataSize);
+
+  expected_data.assign(kSize2, kValue2);
+  observed_data.assign(
+      &file_writer.string()[memory_list->MemoryRanges[1].Memory.Rva],
+      memory_list->MemoryRanges[1].Memory.DataSize);
+  EXPECT_EQ(expected_data, observed_data);
+}
+
+}  // namespace