src/developer/debug/debug_agent/software_breakpoint_unittest.cc

// Copyright 2019 The Fuchsia 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 "src/developer/debug/debug_agent/software_breakpoint.h"

#include <string.h>
#include <zircon/syscalls/exception.h>

#include <gtest/gtest.h>

#include "src/developer/debug/debug_agent/arch_provider_impl.h"
#include "src/developer/debug/debug_agent/breakpoint.h"
#include "src/developer/debug/debug_agent/debugged_thread.h"
#include "src/developer/debug/debug_agent/mock_arch_provider.h"
#include "src/developer/debug/debug_agent/mock_process.h"
#include "src/developer/debug/debug_agent/mock_thread.h"
#include "src/developer/debug/debug_agent/process_memory_accessor.h"
#include "src/developer/debug/shared/logging/debug.h"

namespace debug_agent {

namespace {

// Provides a fake view of memory with the given initial contents.
class FakeMemory : public ProcessMemoryAccessor {
 public:
  FakeMemory(intptr_t address, const char* data, size_t data_len) : address_(address) {
    data_.assign(data, data + data_len);
  }

  const char* data() const { return &data_[0]; }

  zx_status_t ReadProcessMemory(uintptr_t address, void* buffer, size_t len,
                                size_t* actual) override {
    *actual = 0;
    if (address < address_ || address + len > address_ + data_.size())
      return ZX_ERR_NO_MEMORY;  // We require everything to be mapped.

    memcpy(buffer, &data_[address - address_], len);
    *actual = len;
    return ZX_OK;
  }

  zx_status_t WriteProcessMemory(uintptr_t address, const void* buffer, size_t len,
                                 size_t* actual) override {
    *actual = 0;
    if (address < address_ || address + len > address_ + data_.size())
      return ZX_ERR_NO_MEMORY;  // We require everything to be mapped.

    memcpy(&data_[address - address_], buffer, len);
    *actual = len;
    return ZX_OK;
  }

 private:
  uintptr_t address_;
  std::vector<char> data_;
};

// Provides a buffer of known memory for tests below.
class BreakpointFakeMemory {
 public:
  // Make a fake memory buffer with enough room to hold a break instruction.
  static constexpr uintptr_t kAddress = 0x1234;
  static constexpr size_t kDataSize = 4;
  static_assert(kDataSize >= sizeof(arch::BreakInstructionType),
                "Make data bigger for this platform.");
  static const char kOriginalData[kDataSize];

  BreakpointFakeMemory() : memory_(kAddress, kOriginalData, kDataSize) {}
  ~BreakpointFakeMemory() {}

  FakeMemory* memory() { return &memory_; }

  // Returns the memory pointer read out as the type required for the
  // breakpoint instruction.
  arch::BreakInstructionType AsInstructionType() const {
    return *reinterpret_cast<const arch::BreakInstructionType*>(memory_.data());
  }

  // Returns true if the buffer starts with a breakpoint instruction for the
  // current platform.
  bool StartsWithBreak() const { return AsInstructionType() == arch::kBreakInstruction; }

  // Returns true if the buffer is in its original state.
  bool IsOriginal() const { return memcmp(memory_.data(), kOriginalData, kDataSize) == 0; }

 private:
  FakeMemory memory_;
};

// A no-op process delegate.
class TestProcessDelegate : public Breakpoint::ProcessDelegate {
 public:
  TestProcessDelegate() = default;

  BreakpointFakeMemory& mem() { return mem_; }
  std::map<uint64_t, std::unique_ptr<ProcessBreakpoint>>& bps() { return bps_; }

  void InjectMockProcess(std::unique_ptr<MockProcess> proc) {
    procs_[proc->koid()] = std::move(proc);
  }

  // This only gets called if Breakpoint.SetSettings() is called.
  zx_status_t RegisterBreakpoint(Breakpoint* bp, zx_koid_t koid, uint64_t address) override {
    auto found = bps_.find(address);
    if (found == bps_.end()) {
      auto pbp =
          std::make_unique<SoftwareBreakpoint>(bp, procs_[koid].get(), mem_.memory(), address);

      zx_status_t status = pbp->Init();
      if (status != ZX_OK) {
        fprintf(stderr, "Failure initializing %d\n", (int)status);
        return status;
      }

      bps_[address] = std::move(pbp);
    } else {
      found->second->RegisterBreakpoint(bp);
    }
    return ZX_OK;
  }
  void UnregisterBreakpoint(Breakpoint* bp, zx_koid_t, uint64_t address) override {
    auto found = bps_.find(address);
    if (found == bps_.end())
      GTEST_FAIL();

    bool still_used = found->second->UnregisterBreakpoint(bp);
    if (!still_used)
      bps_.erase(found);
  }

 private:
  BreakpointFakeMemory mem_;

  std::map<uint64_t, std::unique_ptr<ProcessBreakpoint>> bps_;
  std::map<zx_koid_t, std::unique_ptr<MockProcess>> procs_;
};

constexpr uintptr_t BreakpointFakeMemory::kAddress;
constexpr size_t BreakpointFakeMemory::kDataSize;
const char BreakpointFakeMemory::kOriginalData[BreakpointFakeMemory::kDataSize] = {0x01, 0x02, 0x03,
                                                                                   0x04};

template <typename T>
std::string ToString(const std::vector<T>& v) {
  std::stringstream ss;
  for (size_t i = 0; i < v.size(); i++) {
    if (i > 0)
      ss << ", ";
    ss << v[i];
  }

  return ss.str();
}

template <typename T>
void CheckVectorContainsElements(const debug_ipc::FileLineFunction& location,
                                 const std::vector<T>& got, const std::vector<T>& expected) {
  ASSERT_EQ(expected.size(), got.size())
      << location.ToString() << ": "
      << "Expected (" << ToString(expected) << "), Got (" << ToString(got) << ").";

  for (size_t i = 0; i < expected.size(); i++) {
    ASSERT_TRUE(expected[i] == got[i])
        << location.ToString() << ": "
        << "Expected (" << ToString(expected) << "), Got (" << ToString(got) << ").";
  }
}

}  // namespace

TEST(ProcessBreakpoint, InstallAndFixup) {
  auto arch_provider = std::make_shared<ArchProviderImpl>();
  auto object_provider = std::make_shared<ObjectProvider>();

  TestProcessDelegate process_delegate;

  Breakpoint main_breakpoint(&process_delegate);
  debug_ipc::BreakpointSettings settings;
  settings.type = debug_ipc::BreakpointType::kSoftware;
  main_breakpoint.SetSettings(settings);

  zx_koid_t process_koid = 0x1234;
  const std::string process_name = "process";
  MockProcess process(nullptr, process_koid, process_name, arch_provider, object_provider);

  SoftwareBreakpoint bp(&main_breakpoint, &process, process_delegate.mem().memory(),
                        BreakpointFakeMemory::kAddress);
  ASSERT_EQ(ZX_OK, bp.Init());

  // Should have written the breakpoint instruction to the buffer.
  EXPECT_TRUE(process_delegate.mem().StartsWithBreak());

  // Make a memory block that contains the address set as the breakpoint.
  // Offset it by kBlockOffset to make sure non-aligned cases are handled.
  debug_ipc::MemoryBlock block;
  constexpr size_t kBlockOffset = 4;
  block.address = BreakpointFakeMemory::kAddress - kBlockOffset;
  block.valid = true;
  block.size = 16;
  block.data.resize(block.size);

  // Fill with current memory contents (including breakpoint instruction).
  memcpy(&block.data[kBlockOffset], process_delegate.mem().memory()->data(),
         BreakpointFakeMemory::kDataSize);

  // FixupMemoryBlock should give back the original data.
  bp.FixupMemoryBlock(&block);
  EXPECT_EQ(0, memcmp(&block.data[kBlockOffset], BreakpointFakeMemory::kOriginalData,
                      BreakpointFakeMemory::kDataSize));
}

// clang-format off
TEST(ProcessBreakpoint, StepSingle) {
  auto arch_provider = std::make_shared<ArchProviderImpl>();
  auto object_provider = std::make_shared<ObjectProvider>();

  TestProcessDelegate process_delegate;

  Breakpoint main_breakpoint(&process_delegate);
  debug_ipc::BreakpointSettings settings;
  settings.type = debug_ipc::BreakpointType::kSoftware;
  main_breakpoint.SetSettings(settings);

  constexpr zx_koid_t process_koid = 0x1234;
  const std::string process_name = "process";
  MockProcess process(nullptr, process_koid, process_name, arch_provider, object_provider);

  // The step over strategy is as follows:
  // Thread 1, 2, 3 will hit the breakpoint and attempt a step over.
  // Thread 4 will remain oblivious to the breakpoint, as will 5.
  // Thread 5 is IsSuspended from the client, so it should not be resumed by the
  // agent during step over.

  constexpr zx_koid_t kThread1Koid = 1;
  constexpr zx_koid_t kThread2Koid = 2;
  constexpr zx_koid_t kThread3Koid = 3;
  constexpr zx_koid_t kThread4Koid = 4;
  constexpr zx_koid_t kThread5Koid = 5;
  MockThread* mock_thread1 = process.AddThread(kThread1Koid);
  MockThread* mock_thread2 = process.AddThread(kThread2Koid);
  MockThread* mock_thread3 = process.AddThread(kThread3Koid);
  MockThread* mock_thread4 = process.AddThread(kThread4Koid);
  MockThread* mock_thread5 = process.AddThread(kThread5Koid);

  mock_thread5->set_client_state(DebuggedThread::ClientState::kPaused);
  mock_thread5->Suspend();

  SoftwareBreakpoint bp(&main_breakpoint, &process, process_delegate.mem().memory(),
                       BreakpointFakeMemory::kAddress);
  ASSERT_EQ(ZX_OK, bp.Init());

  // The breakpoint should be installed.
  EXPECT_TRUE(process_delegate.mem().StartsWithBreak());

  // Thread 1 hits breakpoint ----------------------------------------------------------------------

  bp.BeginStepOver(mock_thread1);

  // Breakpoint should be removed.
  EXPECT_TRUE(process_delegate.mem().IsOriginal());

  // There should be one enqueued step over.
  ASSERT_EQ(process.step_over_queue().size(), 1u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &bp);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread1);

  // Only thread 1 should be still running. The rest should be suspended.
  EXPECT_TRUE(mock_thread1->running());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 1 should be stepping over.
  EXPECT_TRUE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, bp.CurrentlySuspendedThreads(), {kThread2Koid,
                                                                          kThread3Koid,
                                                                          kThread4Koid,
                                                                          kThread5Koid});

  // Thread 2 hits breakpoint ----------------------------------------------------------------------

  // Now the second thread gets the exception.
  bp.BeginStepOver(mock_thread2);

  // There should be 2 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 2u);
  ASSERT_EQ(process.step_over_queue()[1].process_breakpoint.get(), &bp);
  ASSERT_EQ(process.step_over_queue()[1].thread.get(), mock_thread2);

  // Only thread 1 should be running.
  EXPECT_TRUE(mock_thread1->running());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 1 should be stepping over.
  EXPECT_TRUE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, bp.CurrentlySuspendedThreads(), {kThread2Koid,
                                                                          kThread3Koid,
                                                                          kThread4Koid,
                                                                          kThread5Koid});

  // Thread 3 hits breakpoint ----------------------------------------------------------------------

  bp.BeginStepOver(mock_thread3);

  // There should be 2 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 3u);
  ASSERT_EQ(process.step_over_queue()[2].process_breakpoint.get(), &bp);
  ASSERT_EQ(process.step_over_queue()[2].thread.get(), mock_thread3);

  // Only thread 1 should be running.
  EXPECT_TRUE(mock_thread1->running());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 1 should be stepping over right now.
  EXPECT_TRUE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, bp.CurrentlySuspendedThreads(), {kThread2Koid,
                                                                          kThread3Koid,
                                                                          kThread4Koid,
                                                                          kThread5Koid});

  // Breakpoint should still remain removed.
  EXPECT_TRUE(process_delegate.mem().IsOriginal());

  // Thread 1 steps over ---------------------------------------------------------------------------

  bp.EndStepOver(mock_thread1);

  // There should be 2 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 2u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &bp);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread2);
  ASSERT_EQ(process.step_over_queue()[1].process_breakpoint.get(), &bp);
  ASSERT_EQ(process.step_over_queue()[1].thread.get(), mock_thread3);

  // Only thread 2 should be running.
  EXPECT_TRUE(mock_thread1->IsSuspended());
  EXPECT_TRUE(mock_thread2->running());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 2 should be stepping over right now.
  EXPECT_FALSE(mock_thread1->stepping_over_breakpoint());
  EXPECT_TRUE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, bp.CurrentlySuspendedThreads(), {kThread1Koid,
                                                                          kThread3Koid,
                                                                          kThread4Koid,
                                                                          kThread5Koid});

  // The breakpoint should remain removed.
  EXPECT_TRUE(process_delegate.mem().IsOriginal());

  // Thread 2 steps over ---------------------------------------------------------------------------

  bp.EndStepOver(mock_thread2);

  // There should be 1 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 1u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &bp);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread3);

  // Only thread 3 should be running, as it's the only one stepping over.
  EXPECT_TRUE(mock_thread1->IsSuspended());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->running());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 3 should be stepping over right now.
  EXPECT_FALSE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_TRUE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, bp.CurrentlySuspendedThreads(), {kThread1Koid,
                                                                          kThread2Koid,
                                                                          kThread4Koid,
                                                                          kThread5Koid});

  // Breakpoint remains removed.
  EXPECT_TRUE(process_delegate.mem().IsOriginal());

  // Thread 3 steps over ---------------------------------------------------------------------------

  bp.EndStepOver(mock_thread3);

  // No more enqueued elements.
  ASSERT_EQ(process.step_over_queue().size(), 0u);

  // All threads should be resumed except 5, which was paused by the client.
  EXPECT_TRUE(mock_thread1->running());
  EXPECT_TRUE(mock_thread2->running());
  EXPECT_TRUE(mock_thread3->running());
  EXPECT_TRUE(mock_thread4->running());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // No thread should be stepping over.
  EXPECT_FALSE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  EXPECT_TRUE(bp.CurrentlySuspendedThreads().empty());

  // Breakpoint is set again.
  EXPECT_TRUE(process_delegate.mem().StartsWithBreak());
}
// clang-format on

// clang-format off
TEST(ProcessBreakpoint, MultipleBreakpoints) {
  auto arch_provider = std::make_shared<ArchProviderImpl>();
  auto object_provider = std::make_shared<ObjectProvider>();

  TestProcessDelegate process_delegate1;
  TestProcessDelegate process_delegate2;
  TestProcessDelegate process_delegate3;

  Breakpoint main_breakpoint1(&process_delegate1);
  Breakpoint main_breakpoint2(&process_delegate2);
  Breakpoint main_breakpoint3(&process_delegate3);

  debug_ipc::BreakpointSettings settings;
  settings.type = debug_ipc::BreakpointType::kSoftware;
  main_breakpoint1.SetSettings(settings);
  main_breakpoint2.SetSettings(settings);
  main_breakpoint3.SetSettings(settings);

  constexpr zx_koid_t process_koid = 0x1234;
  const std::string process_name = "process";
  MockProcess process(nullptr, process_koid, process_name, arch_provider, object_provider);

  // The step over strategy is as follows:
  // 1. Thread 1 hits breakpoint 1.
  // 2. Thread 2 hits breakpoint 2.
  // 3. Thread 3 hits breakpoint 3.
  // 4. Thread 1 finishes step over.
  // 5. Thread 4 hits breakpoint 2 (somehow).
  // 6. Thread 2 finishes step over.
  // 7. Thread 3 finishes step over.
  // 8. Thread 4 finishes step over.

  constexpr zx_koid_t kThread1Koid = 1;
  constexpr zx_koid_t kThread2Koid = 2;
  constexpr zx_koid_t kThread3Koid = 3;
  constexpr zx_koid_t kThread4Koid = 4;
  constexpr zx_koid_t kThread5Koid = 5;
  DebuggedThread* mock_thread1 = process.AddThread(kThread1Koid);
  DebuggedThread* mock_thread2 = process.AddThread(kThread2Koid);
  DebuggedThread* mock_thread3 = process.AddThread(kThread3Koid);
  DebuggedThread* mock_thread4 = process.AddThread(kThread4Koid);
  DebuggedThread* mock_thread5 = process.AddThread(kThread5Koid);

  SoftwareBreakpoint breakpoint1(&main_breakpoint1, &process, process_delegate1.mem().memory(),
                                 BreakpointFakeMemory::kAddress);

  SoftwareBreakpoint breakpoint2(&main_breakpoint2, &process, process_delegate2.mem().memory(),
                                 BreakpointFakeMemory::kAddress);
  SoftwareBreakpoint breakpoint3(&main_breakpoint3, &process, process_delegate3.mem().memory(),
                                 BreakpointFakeMemory::kAddress);

  ASSERT_EQ(ZX_OK, breakpoint1.Init());
  ASSERT_EQ(ZX_OK, breakpoint2.Init());
  ASSERT_EQ(ZX_OK, breakpoint3.Init());

  // The breakpoint should be installed
  EXPECT_TRUE(process_delegate1.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate2.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());

  // Thread 1 hits breakpoint 1 --------------------------------------------------------------------

  breakpoint1.BeginStepOver(mock_thread1);

  // There should be one enqueued step over.
  ASSERT_EQ(process.step_over_queue().size(), 1u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &breakpoint1);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread1);

  // Only thread 1 should be still running. The rest should be suspended.
  EXPECT_TRUE(mock_thread1->running());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 1 should be stepping over.
  EXPECT_TRUE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, breakpoint1.CurrentlySuspendedThreads(), {kThread2Koid,
                                                                                   kThread3Koid,
                                                                                   kThread4Koid,
                                                                                   kThread5Koid});
  CheckVectorContainsElements(FROM_HERE, breakpoint2.CurrentlySuspendedThreads(), {});
  CheckVectorContainsElements(FROM_HERE, breakpoint3.CurrentlySuspendedThreads(), {});

  // Breakpoint should be removed. Others breakpoints should remain set.
  EXPECT_TRUE(process_delegate1.mem().IsOriginal());
  EXPECT_TRUE(process_delegate2.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());

  // Thread 2 hits breakpoint 2 --------------------------------------------------------------------

  // Now the second thread gets the exception.
  breakpoint2.BeginStepOver(mock_thread2);

  // There should be 2 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 2u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &breakpoint1);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread1);
  ASSERT_EQ(process.step_over_queue()[1].process_breakpoint.get(), &breakpoint2);
  ASSERT_EQ(process.step_over_queue()[1].thread.get(), mock_thread2);

  // Only thread 1 should be running.
  EXPECT_TRUE(mock_thread1->running());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 1 should be stepping over.
  EXPECT_TRUE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, breakpoint1.CurrentlySuspendedThreads(), {kThread2Koid,
                                                                                   kThread3Koid,
                                                                                   kThread4Koid,
                                                                                   kThread5Koid});
  CheckVectorContainsElements(FROM_HERE, breakpoint2.CurrentlySuspendedThreads(), {});
  CheckVectorContainsElements(FROM_HERE, breakpoint3.CurrentlySuspendedThreads(), {});

  // Breakpoint should be removed. Others breakpoints should remain set.
  EXPECT_TRUE(process_delegate1.mem().IsOriginal());
  EXPECT_TRUE(process_delegate2.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());

  // Thread 3 hits breakpoint ----------------------------------------------------------------------

  breakpoint3.BeginStepOver(mock_thread3);

  // There should be 2 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 3u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &breakpoint1);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread1);
  ASSERT_EQ(process.step_over_queue()[1].process_breakpoint.get(), &breakpoint2);
  ASSERT_EQ(process.step_over_queue()[1].thread.get(), mock_thread2);
  ASSERT_EQ(process.step_over_queue()[2].process_breakpoint.get(), &breakpoint3);
  ASSERT_EQ(process.step_over_queue()[2].thread.get(), mock_thread3);

  // Only thread 1 should be running.
  EXPECT_TRUE(mock_thread1->running());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 1 should be stepping over right now.
  EXPECT_TRUE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, breakpoint1.CurrentlySuspendedThreads(), {kThread2Koid,
                                                                                   kThread3Koid,
                                                                                   kThread4Koid,
                                                                                   kThread5Koid});
  CheckVectorContainsElements(FROM_HERE, breakpoint2.CurrentlySuspendedThreads(), {});
  CheckVectorContainsElements(FROM_HERE, breakpoint3.CurrentlySuspendedThreads(), {});

  // Breakpoint should be removed. Others breakpoints should remain set.
  EXPECT_TRUE(process_delegate1.mem().IsOriginal());
  EXPECT_TRUE(process_delegate2.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());

  // Breakpoint 1 should be removed. Others breakpoints should remain set.
  EXPECT_TRUE(process_delegate1.mem().IsOriginal());
  EXPECT_TRUE(process_delegate2.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());

  // Thread 1 steps over ---------------------------------------------------------------------------

  breakpoint1.EndStepOver(mock_thread1);

  // There should be 2 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 2u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &breakpoint2);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread2);
  ASSERT_EQ(process.step_over_queue()[1].process_breakpoint.get(), &breakpoint3);
  ASSERT_EQ(process.step_over_queue()[1].thread.get(), mock_thread3);

  // Only thread 2 should be running.
  EXPECT_TRUE(mock_thread1->IsSuspended());
  EXPECT_TRUE(mock_thread2->running());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 2 should be stepping over right now.
  EXPECT_FALSE(mock_thread1->stepping_over_breakpoint());
  EXPECT_TRUE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());


  CheckVectorContainsElements(FROM_HERE, breakpoint1.CurrentlySuspendedThreads(), {});
  CheckVectorContainsElements(FROM_HERE, breakpoint2.CurrentlySuspendedThreads(), {kThread1Koid,
                                                                                   kThread3Koid,
                                                                                   kThread4Koid,
                                                                                   kThread5Koid});
  CheckVectorContainsElements(FROM_HERE, breakpoint3.CurrentlySuspendedThreads(), {});

  // Breakpoint 2 should be the only one removed.
  EXPECT_TRUE(process_delegate1.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate2.mem().IsOriginal());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());

  // Thread 4 hits breakpoint 2 --------------------------------------------------------------------

  breakpoint2.BeginStepOver(mock_thread4);

  // There should be 3 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 3u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &breakpoint2);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread2);
  ASSERT_EQ(process.step_over_queue()[1].process_breakpoint.get(), &breakpoint3);
  ASSERT_EQ(process.step_over_queue()[1].thread.get(), mock_thread3);
  ASSERT_EQ(process.step_over_queue()[2].process_breakpoint.get(), &breakpoint2);
  ASSERT_EQ(process.step_over_queue()[2].thread.get(), mock_thread4);

  // Only thread 2 should be running.
  EXPECT_TRUE(mock_thread1->IsSuspended());
  EXPECT_TRUE(mock_thread2->running());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 2 should be stepping over right now.
  EXPECT_FALSE(mock_thread1->stepping_over_breakpoint());
  EXPECT_TRUE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, breakpoint1.CurrentlySuspendedThreads(), {});
  CheckVectorContainsElements(FROM_HERE, breakpoint2.CurrentlySuspendedThreads(), {kThread1Koid,
                                                                                   kThread3Koid,
                                                                                   kThread4Koid,
                                                                                   kThread5Koid});
  CheckVectorContainsElements(FROM_HERE, breakpoint3.CurrentlySuspendedThreads(), {});

  // Breakpoint 2 should be the only one removed.
  EXPECT_TRUE(process_delegate1.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate2.mem().IsOriginal());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());

  // Thread 2 steps over ---------------------------------------------------------------------------

  breakpoint2.EndStepOver(mock_thread2);

  // There should be 2 enqueued step overs.
  ASSERT_EQ(process.step_over_queue().size(), 2u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &breakpoint3);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread3);
  ASSERT_EQ(process.step_over_queue()[1].process_breakpoint.get(), &breakpoint2);
  ASSERT_EQ(process.step_over_queue()[1].thread.get(), mock_thread4);

  // Only thread 3 should be running, as it's the only one stepping over.
  EXPECT_TRUE(mock_thread1->IsSuspended());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->running());
  EXPECT_TRUE(mock_thread4->IsSuspended());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 3 should be stepping over right now.
  EXPECT_FALSE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_TRUE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, breakpoint1.CurrentlySuspendedThreads(), {});
  CheckVectorContainsElements(FROM_HERE, breakpoint2.CurrentlySuspendedThreads(), {});
  CheckVectorContainsElements(FROM_HERE, breakpoint3.CurrentlySuspendedThreads(), {kThread1Koid,
                                                                                   kThread2Koid,
                                                                                   kThread4Koid,
                                                                                   kThread5Koid});
  // Breakpoint 3 should be the only one removed.
  EXPECT_TRUE(process_delegate1.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate2.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate3.mem().IsOriginal());

  // Thread 3 steps over ---------------------------------------------------------------------------

  breakpoint3.EndStepOver(mock_thread3);

  // No more enqueued elements.
  ASSERT_EQ(process.step_over_queue().size(), 1u);
  ASSERT_EQ(process.step_over_queue()[0].process_breakpoint.get(), &breakpoint2);
  ASSERT_EQ(process.step_over_queue()[0].thread.get(), mock_thread4);

  // Only thread 4 should be running, as it's the only one stepping over.
  EXPECT_TRUE(mock_thread1->IsSuspended());
  EXPECT_TRUE(mock_thread2->IsSuspended());
  EXPECT_TRUE(mock_thread3->IsSuspended());
  EXPECT_TRUE(mock_thread4->running());
  EXPECT_TRUE(mock_thread5->IsSuspended());

  // Only thread 3 should be stepping over right now.
  EXPECT_FALSE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_TRUE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  CheckVectorContainsElements(FROM_HERE, breakpoint1.CurrentlySuspendedThreads(), {});
  CheckVectorContainsElements(FROM_HERE, breakpoint2.CurrentlySuspendedThreads(), {kThread1Koid,
                                                                                   kThread2Koid,
                                                                                   kThread3Koid,
                                                                                   kThread5Koid});
  CheckVectorContainsElements(FROM_HERE, breakpoint3.CurrentlySuspendedThreads(), {});

  // Breakpoint 2 should be the only one removed.
  EXPECT_TRUE(process_delegate1.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate2.mem().IsOriginal());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());

  // Thread 4 steps over ---------------------------------------------------------------------------

  breakpoint2.EndStepOver(mock_thread4);

  // All threads should be resumed.
  EXPECT_TRUE(mock_thread1->running());
  EXPECT_TRUE(mock_thread2->running());
  EXPECT_TRUE(mock_thread3->running());
  EXPECT_TRUE(mock_thread4->running());
  EXPECT_TRUE(mock_thread5->running());

  // No thread should be stepping over.
  EXPECT_FALSE(mock_thread1->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread2->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread3->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread4->stepping_over_breakpoint());
  EXPECT_FALSE(mock_thread5->stepping_over_breakpoint());

  EXPECT_TRUE(breakpoint1.CurrentlySuspendedThreads().empty());
  EXPECT_TRUE(breakpoint2.CurrentlySuspendedThreads().empty());
  EXPECT_TRUE(breakpoint3.CurrentlySuspendedThreads().empty());

  // All breakpoints are set again.
  EXPECT_TRUE(process_delegate1.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate2.mem().StartsWithBreak());
  EXPECT_TRUE(process_delegate3.mem().StartsWithBreak());
}
// clang-format on

// This also tests registration and unregistration of ProcessBreakpoints via
// the Breakpoint object.
TEST(ProcessBreakpoint, HitCount) {
  TestProcessDelegate process_delegate;

  constexpr uint32_t kBreakpointId1 = 12;
  debug_ipc::BreakpointSettings settings;
  settings.id = kBreakpointId1;
  settings.type = debug_ipc::BreakpointType::kSoftware;
  settings.locations.resize(1);

  constexpr zx_koid_t kProcess1 = 1;

  debug_ipc::ProcessBreakpointSettings& pr_settings = settings.locations.back();
  pr_settings.process_koid = kProcess1;
  pr_settings.thread_koid = 0;
  pr_settings.address = BreakpointFakeMemory::kAddress;

  // Create a ProcessBreakpoint referencing the two Breakpoint objects
  // (corresponds to two logical breakpoints at the same address).
  std::unique_ptr<Breakpoint> main_breakpoint1 = std::make_unique<Breakpoint>(&process_delegate);
  zx_status_t status = main_breakpoint1->SetSettings(settings);
  ASSERT_EQ(ZX_OK, status);

  std::unique_ptr<Breakpoint> main_breakpoint2 = std::make_unique<Breakpoint>(&process_delegate);
  constexpr uint32_t kBreakpointId2 = 13;
  settings.id = kBreakpointId2;
  status = main_breakpoint2->SetSettings(settings);
  ASSERT_EQ(ZX_OK, status);

  // There should only be one address with a breakpoint.
  ASSERT_EQ(1u, process_delegate.bps().size());
  EXPECT_EQ(BreakpointFakeMemory::kAddress, process_delegate.bps().begin()->first);

  // Hitting the ProcessBreakpoint should update both Breakpoints.
  std::vector<debug_ipc::BreakpointStats> stats;
  process_delegate.bps().begin()->second->OnHit(debug_ipc::BreakpointType::kSoftware, &stats);
  ASSERT_EQ(2u, stats.size());

  // Order of the vector is not defined so allow either.
  EXPECT_TRUE((stats[0].id == kBreakpointId1 && stats[1].id == kBreakpointId2) ||
              (stats[0].id == kBreakpointId2 && stats[1].id == kBreakpointId1));

  // The hit count of both should be 1 (order doesn't matter).
  EXPECT_EQ(1u, stats[0].hit_count);
  EXPECT_EQ(1u, stats[1].hit_count);

  // Unregistering one Breakpoint should keep the ProcessBreakpoint.
  main_breakpoint2.reset();
  ASSERT_EQ(1u, process_delegate.bps().size());

  // Unregistering the other should delete it.
  main_breakpoint1.reset();
  ASSERT_EQ(0u, process_delegate.bps().size());
}

#ifdef PROCESS_BREAKPOINT_TRANSITION

TEST(ProcessBreakpoint, HWBreakpointForAllThreads) {
  constexpr zx_koid_t kProcessId = 0x1234;
  constexpr zx_koid_t kThreadId1 = 0x1;
  constexpr zx_koid_t kThreadId2 = 0x2;
  constexpr zx_koid_t kThreadId3 = 0x3;
  constexpr uint32_t kBreakpointId1 = 0x1;
  constexpr uint64_t kAddress = 0x80000000;

  auto process = std::make_unique<MockProcess>(nullptr, kProcessId, ObjectProvider::Get());
  process->AddThread(kThreadId1);
  process->AddThread(kThreadId2);
  process->AddThread(kThreadId3);
  TestProcessDelegate process_delegate;
  process_delegate.InjectMockProcess(std::move(process));

  // Any calls to the architecture will be routed to this instance.
  ScopedMockArchProvider scoped_arch_provider;
  MockArchProvider* arch_provider = scoped_arch_provider.get_provider();

  auto breakpoint = std::make_unique<Breakpoint>(&process_delegate);
  debug_ipc::BreakpointSettings settings1 = {};
  settings1.id = kBreakpointId1;
  // This location is for all threads.
  settings1.locations.push_back({kProcessId, 0, kAddress});
  zx_status_t status = breakpoint->SetSettings(debug_ipc::BreakpointType::kHardware, settings1);
  ASSERT_EQ(status, ZX_OK);

  // Should have installed the breakpoint.
  ASSERT_EQ(process_delegate.bps().size(), 1u);
  auto& process_bp = process_delegate.bps().begin()->second;
  ASSERT_EQ(process_bp->address(), kAddress);

  // It should have installed a HW breakpoint for each thread.
  EXPECT_FALSE(process_bp->SoftwareBreakpointInstalled());
  EXPECT_TRUE(process_bp->HardwareBreakpointInstalled());
  EXPECT_EQ(arch_provider->BreakpointInstallCount(kAddress), 3u);

  // Deleting the breakpoint should remove the process breakpoint.
  breakpoint.reset();
  EXPECT_EQ(arch_provider->BreakpointUninstallCount(kAddress), 3u);
  EXPECT_EQ(process_delegate.bps().size(), 0u);
}

TEST(ProcessBreakpoint, HWBreakpointWithThreadId) {
  constexpr zx_koid_t kProcessId = 0x1234;
  constexpr zx_koid_t kThreadId1 = 0x1;
  constexpr zx_koid_t kThreadId2 = 0x2;
  constexpr zx_koid_t kThreadId3 = 0x3;
  constexpr uint32_t kBreakpointId1 = 0x1;
  constexpr uint32_t kBreakpointId2 = 0x2;
  constexpr uint32_t kSwBreakpointId = 0x3;
  constexpr uint64_t kAddress = BreakpointFakeMemory::kAddress;
  constexpr uint64_t kOtherAddress = 0x8fffffff;

  auto process = std::make_unique<MockProcess>(nullptr, kProcessId, ObjectProvider::Get());
  process->AddThread(kThreadId1);
  process->AddThread(kThreadId2);
  process->AddThread(kThreadId3);
  TestProcessDelegate process_delegate;
  process_delegate.InjectMockProcess(std::move(process));

  // Any calls to the architecture will be routed to this instance.
  ScopedMockArchProvider scoped_arch_provider;
  MockArchProvider* arch_provider = scoped_arch_provider.get_provider();

  auto breakpoint1 = std::make_unique<Breakpoint>(&process_delegate);
  debug_ipc::BreakpointSettings settings1 = {};
  settings1.id = kBreakpointId1;
  settings1.type = debug_ipc::BreakpointType::kHardware;
  settings1.locations.push_back({kProcessId, kThreadId1, kAddress});
  zx_status_t status = breakpoint1->SetSettings(settings1);
  ASSERT_EQ(status, ZX_OK);
  // Should have installed the process breakpoint.
  ASSERT_EQ(process_delegate.bps().size(), 1u);
  auto& process_bp = process_delegate.bps().begin()->second;
  ASSERT_EQ(process_bp->address(), kAddress);
  // This should have installed HW breakpoint for only one thread.
  // This should have installed only a HW breakpoint.
  ASSERT_EQ(arch_provider->TotalBreakpointInstallCalls(), 1u);
  ASSERT_EQ(arch_provider->BreakpointInstallCount(kAddress), 1u);
  ASSERT_EQ(arch_provider->TotalBreakpointUninstallCalls(), 0u);
  EXPECT_FALSE(process_bp->SoftwareBreakpointInstalled());
  EXPECT_TRUE(process_bp->HardwareBreakpointInstalled());

  // Register another breakpoint.
  auto breakpoint2 = std::make_unique<Breakpoint>(&process_delegate);
  debug_ipc::BreakpointSettings settings2 = {};
  settings2.id = kBreakpointId2;
  settings2.type = debug_ipc::BreakpointType::kHardware;
  settings2.locations.push_back({kProcessId, kThreadId2, kAddress});
  // This breakpoint has another location for another thread.
  // In practice, this should not happen, but it's important that no HW
  // breakpoint get installed if for the wrong location.
  settings2.locations.push_back({kProcessId, kThreadId3, kOtherAddress});
  breakpoint2->SetSettings(settings2);
  // Registering this breakpoint should create a new ProcessBreakpoint.
  ASSERT_EQ(process_delegate.bps().size(), 2u);
  auto& process_bp2 = (process_delegate.bps().begin()++)->second;
  ASSERT_EQ(process_bp2->address(), kOtherAddress);
  // Registering the second breakpoint should install for the new thread in
  // the old location and one in the new location.
  ASSERT_EQ(arch_provider->TotalBreakpointInstallCalls(), 3u);
  ASSERT_EQ(arch_provider->BreakpointInstallCount(kAddress), 2u);
  ASSERT_EQ(arch_provider->BreakpointInstallCount(kOtherAddress), 1u);
  ASSERT_EQ(arch_provider->TotalBreakpointUninstallCalls(), 0u);
  EXPECT_FALSE(process_bp->SoftwareBreakpointInstalled());

  // Unregistering a breakpoint should only uninstall the HW breakpoint for
  // one thread.
  breakpoint1.reset();
  ASSERT_EQ(arch_provider->TotalBreakpointInstallCalls(), 3u);
  ASSERT_EQ(arch_provider->TotalBreakpointUninstallCalls(), 1u);
  ASSERT_EQ(arch_provider->BreakpointUninstallCount(kAddress), 1u);
  ASSERT_EQ(arch_provider->BreakpointUninstallCount(kOtherAddress), 0u);
  EXPECT_FALSE(process_bp->SoftwareBreakpointInstalled());
  EXPECT_FALSE(process_bp->SoftwareBreakpointInstalled());
  EXPECT_TRUE(process_bp->HardwareBreakpointInstalled());
  EXPECT_TRUE(process_bp2->HardwareBreakpointInstalled());

  // Adding a SW breakpoint should not install HW locations.
  auto sw_breakpoint = std::make_unique<Breakpoint>(&process_delegate);
  debug_ipc::BreakpointSettings sw_settings = {};
  sw_settings.id = kSwBreakpointId;
  sw_settings.type = debug_ipc::BreakpointType::kSoftware;
  sw_settings.locations.push_back({kProcessId, 0, kAddress});
  sw_breakpoint->SetSettings(sw_settings);
  // Should have installed only a SW breakpoint.
  ASSERT_EQ(arch_provider->TotalBreakpointInstallCalls(), 3u);
  ASSERT_EQ(arch_provider->TotalBreakpointUninstallCalls(), 1u);
  EXPECT_TRUE(process_bp->SoftwareBreakpointInstalled());

  // Unregistering should remove the other hw breakpoint.
  // And also the second process breakpoint.
  breakpoint2.reset();
  ASSERT_EQ(arch_provider->TotalBreakpointInstallCalls(), 3u);
  ASSERT_EQ(arch_provider->TotalBreakpointUninstallCalls(), 3u);
  ASSERT_EQ(arch_provider->BreakpointUninstallCount(kAddress), 2u);
  ASSERT_EQ(arch_provider->BreakpointUninstallCount(kOtherAddress), 1u);
  EXPECT_FALSE(process_bp->HardwareBreakpointInstalled());
  EXPECT_TRUE(process_bp->SoftwareBreakpointInstalled());
  ASSERT_EQ(process_delegate.bps().size(), 1u);
  EXPECT_EQ(process_delegate.bps().begin()->second->address(), kAddress);

  // Removing the SW breakpoint should work and would delete the final process
  // breakpoint.
  sw_breakpoint.reset();
  ASSERT_EQ(arch_provider->TotalBreakpointInstallCalls(), 3u);
  ASSERT_EQ(arch_provider->TotalBreakpointUninstallCalls(), 3u);
  EXPECT_EQ(process_delegate.bps().size(), 0u);
}

#endif

}  // namespace debug_agent