src/third_party/v8/test/cctest/test-debug.cc

// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <stdlib.h>

#include "src/init/v8.h"

#include "src/api/api-inl.h"
#include "src/codegen/compilation-cache.h"
#include "src/debug/debug-interface.h"
#include "src/debug/debug.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/execution/frames.h"
#include "src/execution/microtask-queue.h"
#include "src/objects/objects-inl.h"
#include "src/snapshot/snapshot.h"
#include "src/utils/utils.h"
#include "test/cctest/cctest.h"

using ::v8::internal::Handle;
using ::v8::internal::StepNone;  // From StepAction enum
using ::v8::internal::StepIn;  // From StepAction enum
using ::v8::internal::StepNext;  // From StepAction enum
using ::v8::internal::StepOut;  // From StepAction enum

// --- H e l p e r   F u n c t i o n s

// Compile and run the supplied source and return the requested function.
static v8::Local<v8::Function> CompileFunction(v8::Isolate* isolate,
                                               const char* source,
                                               const char* function_name) {
  CompileRunChecked(isolate, source);
  v8::Local<v8::String> name = v8_str(isolate, function_name);
  v8::Local<v8::Context> context = isolate->GetCurrentContext();
  v8::MaybeLocal<v8::Value> maybe_function =
      context->Global()->Get(context, name);
  return v8::Local<v8::Function>::Cast(maybe_function.ToLocalChecked());
}


// Compile and run the supplied source and return the requested function.
static v8::Local<v8::Function> CompileFunction(LocalContext* env,
                                               const char* source,
                                               const char* function_name) {
  return CompileFunction((*env)->GetIsolate(), source, function_name);
}

// Is there any debug info for the function?
static bool HasBreakInfo(v8::Local<v8::Function> fun) {
  Handle<v8::internal::JSFunction> f =
      Handle<v8::internal::JSFunction>::cast(v8::Utils::OpenHandle(*fun));
  Handle<v8::internal::SharedFunctionInfo> shared(f->shared(), f->GetIsolate());
  return shared->HasBreakInfo();
}

// Set a break point in a function with a position relative to function start,
// and return the associated break point number.
static i::Handle<i::BreakPoint> SetBreakPoint(v8::Local<v8::Function> fun,
                                              int position,
                                              const char* condition = nullptr) {
  i::Handle<i::JSFunction> function =
      i::Handle<i::JSFunction>::cast(v8::Utils::OpenHandle(*fun));
  position += function->shared().StartPosition();
  static int break_point_index = 0;
  i::Isolate* isolate = function->GetIsolate();
  i::Handle<i::String> condition_string =
      condition ? isolate->factory()->NewStringFromAsciiChecked(condition)
                : isolate->factory()->empty_string();
  i::Debug* debug = isolate->debug();
  i::Handle<i::BreakPoint> break_point =
      isolate->factory()->NewBreakPoint(++break_point_index, condition_string);

  debug->SetBreakpoint(handle(function->shared(), isolate), break_point,
                       &position);
  return break_point;
}


static void ClearBreakPoint(i::Handle<i::BreakPoint> break_point) {
  v8::internal::Isolate* isolate = CcTest::i_isolate();
  v8::internal::Debug* debug = isolate->debug();
  debug->ClearBreakPoint(break_point);
}


// Change break on exception.
static void ChangeBreakOnException(bool caught, bool uncaught) {
  v8::internal::Debug* debug = CcTest::i_isolate()->debug();
  debug->ChangeBreakOnException(v8::internal::BreakException, caught);
  debug->ChangeBreakOnException(v8::internal::BreakUncaughtException, uncaught);
}


// Prepare to step to next break location.
static void PrepareStep(i::StepAction step_action) {
  v8::internal::Debug* debug = CcTest::i_isolate()->debug();
  debug->PrepareStep(step_action);
}

// This function is in namespace v8::internal to be friend with class
// v8::internal::Debug.
namespace v8 {
namespace internal {

// Collect the currently debugged functions.
Handle<FixedArray> GetDebuggedFunctions() {
  Debug* debug = CcTest::i_isolate()->debug();

  v8::internal::DebugInfoListNode* node = debug->debug_info_list_;

  // Find the number of debugged functions.
  int count = 0;
  while (node) {
    count++;
    node = node->next();
  }

  // Allocate array for the debugged functions
  Handle<FixedArray> debugged_functions =
      CcTest::i_isolate()->factory()->NewFixedArray(count);

  // Run through the debug info objects and collect all functions.
  count = 0;
  while (node) {
    debugged_functions->set(count++, *node->debug_info());
    node = node->next();
  }

  return debugged_functions;
}


// Check that the debugger has been fully unloaded.
void CheckDebuggerUnloaded() {
  // Check that the debugger context is cleared and that there is no debug
  // information stored for the debugger.
  CHECK(!CcTest::i_isolate()->debug()->debug_info_list_);

  // Collect garbage to ensure weak handles are cleared.
  CcTest::CollectAllGarbage();
  CcTest::CollectAllGarbage();

  // Iterate the heap and check that there are no debugger related objects left.
  HeapObjectIterator iterator(CcTest::heap());
  for (HeapObject obj = iterator.Next(); !obj.is_null();
       obj = iterator.Next()) {
    CHECK(!obj.IsDebugInfo());
  }
}


}  // namespace internal
}  // namespace v8


// Check that the debugger has been fully unloaded.
static void CheckDebuggerUnloaded() { v8::internal::CheckDebuggerUnloaded(); }

// --- D e b u g   E v e n t   H a n d l e r s
// ---
// --- The different tests uses a number of debug event handlers.
// ---

// Debug event handler which counts a number of events.
int break_point_hit_count = 0;
int break_point_hit_count_deoptimize = 0;
class DebugEventCounter : public v8::debug::DebugDelegate {
 public:
  void BreakProgramRequested(
      v8::Local<v8::Context>,
      const std::vector<v8::debug::BreakpointId>&) override {
    break_point_hit_count++;
    // Perform a full deoptimization when the specified number of
    // breaks have been hit.
    if (break_point_hit_count == break_point_hit_count_deoptimize) {
      i::Deoptimizer::DeoptimizeAll(CcTest::i_isolate());
    }
    if (step_action_ != StepNone) PrepareStep(step_action_);
  }

  void set_step_action(i::StepAction step_action) {
    step_action_ = step_action;
  }

 private:
  i::StepAction step_action_ = StepNone;
};

// Debug event handler which performs a garbage collection.
class DebugEventBreakPointCollectGarbage : public v8::debug::DebugDelegate {
 public:
  void BreakProgramRequested(
      v8::Local<v8::Context>,
      const std::vector<v8::debug::BreakpointId>&) override {
    // Perform a garbage collection when break point is hit and continue. Based
    // on the number of break points hit either scavenge or mark compact
    // collector is used.
    break_point_hit_count++;
    if (break_point_hit_count % 2 == 0) {
      // Scavenge.
      CcTest::CollectGarbage(v8::internal::NEW_SPACE);
    } else {
      // Mark sweep compact.
      CcTest::CollectAllGarbage();
    }
  }
};

// Debug event handler which re-issues a debug break and calls the garbage
// collector to have the heap verified.
class DebugEventBreak : public v8::debug::DebugDelegate {
 public:
  void BreakProgramRequested(
      v8::Local<v8::Context>,
      const std::vector<v8::debug::BreakpointId>&) override {
    // Count the number of breaks.
    break_point_hit_count++;

    // Run the garbage collector to enforce heap verification if option
    // --verify-heap is set.
    CcTest::CollectGarbage(v8::internal::NEW_SPACE);

    // Set the break flag again to come back here as soon as possible.
    v8::debug::SetBreakOnNextFunctionCall(CcTest::isolate());
  }
};

static void BreakRightNow(v8::Isolate* isolate, void*) {
  v8::debug::BreakRightNow(isolate);
}

// Debug event handler which re-issues a debug break until a limit has been
// reached.
int max_break_point_hit_count = 0;
bool terminate_after_max_break_point_hit = false;
class DebugEventBreakMax : public v8::debug::DebugDelegate {
 public:
  void BreakProgramRequested(
      v8::Local<v8::Context>,
      const std::vector<v8::debug::BreakpointId>&) override {
    v8::Isolate* v8_isolate = CcTest::isolate();
    v8::internal::Isolate* isolate = CcTest::i_isolate();
    if (break_point_hit_count < max_break_point_hit_count) {
      // Count the number of breaks.
      break_point_hit_count++;

      // Set the break flag again to come back here as soon as possible.
      v8_isolate->RequestInterrupt(BreakRightNow, nullptr);

    } else if (terminate_after_max_break_point_hit) {
      // Terminate execution after the last break if requested.
      v8_isolate->TerminateExecution();
    }

    // Perform a full deoptimization when the specified number of
    // breaks have been hit.
    if (break_point_hit_count == break_point_hit_count_deoptimize) {
      i::Deoptimizer::DeoptimizeAll(isolate);
    }
  }
};

// --- T h e   A c t u a l   T e s t s

// Test that the debug info in the VM is in sync with the functions being
// debugged.
TEST(DebugInfo) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  // Create a couple of functions for the test.
  v8::Local<v8::Function> foo =
      CompileFunction(&env, "function foo(){}", "foo");
  v8::Local<v8::Function> bar =
      CompileFunction(&env, "function bar(){}", "bar");
  // Initially no functions are debugged.
  CHECK_EQ(0, v8::internal::GetDebuggedFunctions()->length());
  CHECK(!HasBreakInfo(foo));
  CHECK(!HasBreakInfo(bar));
  EnableDebugger(env->GetIsolate());
  // One function (foo) is debugged.
  i::Handle<i::BreakPoint> bp1 = SetBreakPoint(foo, 0);
  CHECK_EQ(1, v8::internal::GetDebuggedFunctions()->length());
  CHECK(HasBreakInfo(foo));
  CHECK(!HasBreakInfo(bar));
  // Two functions are debugged.
  i::Handle<i::BreakPoint> bp2 = SetBreakPoint(bar, 0);
  CHECK_EQ(2, v8::internal::GetDebuggedFunctions()->length());
  CHECK(HasBreakInfo(foo));
  CHECK(HasBreakInfo(bar));
  // One function (bar) is debugged.
  ClearBreakPoint(bp1);
  CHECK_EQ(1, v8::internal::GetDebuggedFunctions()->length());
  CHECK(!HasBreakInfo(foo));
  CHECK(HasBreakInfo(bar));
  // No functions are debugged.
  ClearBreakPoint(bp2);
  DisableDebugger(env->GetIsolate());
  CHECK_EQ(0, v8::internal::GetDebuggedFunctions()->length());
  CHECK(!HasBreakInfo(foo));
  CHECK(!HasBreakInfo(bar));
}


// Test that a break point can be set at an IC store location.
TEST(BreakPointICStore) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  v8::Local<v8::Function> foo =
      CompileFunction(&env, "function foo(){bar=0;}", "foo");

  // Run without breakpoints.
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint
  i::Handle<i::BreakPoint> bp = SetBreakPoint(foo, 0);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(1, break_point_hit_count);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

// Test that a break point can be set at an IC store location.
TEST(BreakPointCondition) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  CompileRun("var a = false");
  v8::Local<v8::Function> foo =
      CompileFunction(&env, "function foo() { return 1 }", "foo");
  // Run without breakpoints.
  CompileRun("foo()");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint
  i::Handle<i::BreakPoint> bp = SetBreakPoint(foo, 0, "a == true");
  CompileRun("foo()");
  CHECK_EQ(0, break_point_hit_count);

  CompileRun("a = true");
  CompileRun("foo()");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("foo()");
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

// Test that a break point can be set at an IC load location.
TEST(BreakPointICLoad) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  CompileRunChecked(env->GetIsolate(), "bar=1");
  v8::Local<v8::Function> foo =
      CompileFunction(&env, "function foo(){var x=bar;}", "foo");

  // Run without breakpoints.
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  i::Handle<i::BreakPoint> bp = SetBreakPoint(foo, 0);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(1, break_point_hit_count);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test that a break point can be set at an IC call location.
TEST(BreakPointICCall) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  CompileRunChecked(env->GetIsolate(), "function bar(){}");
  v8::Local<v8::Function> foo =
      CompileFunction(&env, "function foo(){bar();}", "foo");

  // Run without breakpoints.
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint
  i::Handle<i::BreakPoint> bp = SetBreakPoint(foo, 0);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(1, break_point_hit_count);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  foo->Call(env.local(), env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test that a break point can be set at an IC call location and survive a GC.
TEST(BreakPointICCallWithGC) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  DebugEventBreakPointCollectGarbage delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  CompileRunChecked(env->GetIsolate(), "function bar(){return 1;}");
  v8::Local<v8::Function> foo =
      CompileFunction(&env, "function foo(){return bar();}", "foo");
  v8::Local<v8::Context> context = env.local();

  // Run without breakpoints.
  CHECK_EQ(1, foo->Call(context, env->Global(), 0, nullptr)
                  .ToLocalChecked()
                  ->Int32Value(context)
                  .FromJust());
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  i::Handle<i::BreakPoint> bp = SetBreakPoint(foo, 0);
  CHECK_EQ(1, foo->Call(context, env->Global(), 0, nullptr)
                  .ToLocalChecked()
                  ->Int32Value(context)
                  .FromJust());
  CHECK_EQ(1, break_point_hit_count);
  CHECK_EQ(1, foo->Call(context, env->Global(), 0, nullptr)
                  .ToLocalChecked()
                  ->Int32Value(context)
                  .FromJust());
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test that a break point can be set at an IC call location and survive a GC.
TEST(BreakPointConstructCallWithGC) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  DebugEventBreakPointCollectGarbage delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  CompileRunChecked(env->GetIsolate(), "function bar(){ this.x = 1;}");
  v8::Local<v8::Function> foo =
      CompileFunction(&env, "function foo(){return new bar(1).x;}", "foo");
  v8::Local<v8::Context> context = env.local();

  // Run without breakpoints.
  CHECK_EQ(1, foo->Call(context, env->Global(), 0, nullptr)
                  .ToLocalChecked()
                  ->Int32Value(context)
                  .FromJust());
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  i::Handle<i::BreakPoint> bp = SetBreakPoint(foo, 0);
  CHECK_EQ(1, foo->Call(context, env->Global(), 0, nullptr)
                  .ToLocalChecked()
                  ->Int32Value(context)
                  .FromJust());
  CHECK_EQ(1, break_point_hit_count);
  CHECK_EQ(1, foo->Call(context, env->Global(), 0, nullptr)
                  .ToLocalChecked()
                  ->Int32Value(context)
                  .FromJust());
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(BreakPointBuiltin) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test simple builtin ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.prototype.repeat").As<v8::Function>();

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "this != 1");
  ExpectString("'b'.repeat(10)", "bbbbbbbbbb");
  CHECK_EQ(1, break_point_hit_count);

  ExpectString("'b'.repeat(10)", "bbbbbbbbbb");
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  ExpectString("'b'.repeat(10)", "bbbbbbbbbb");
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointApiIntrinsics) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;

  // === Test that using API-exposed functions won't trigger breakpoints ===
  {
    v8::Local<v8::Function> weakmap_get =
        CompileRun("WeakMap.prototype.get").As<v8::Function>();
    SetBreakPoint(weakmap_get, 0);
    v8::Local<v8::Function> weakmap_set =
        CompileRun("WeakMap.prototype.set").As<v8::Function>();
    SetBreakPoint(weakmap_set, 0);

    // Run with breakpoint.
    break_point_hit_count = 0;
    CompileRun("var w = new WeakMap(); w.set(w, 1); w.get(w);");
    CHECK_EQ(2, break_point_hit_count);

    break_point_hit_count = 0;
    v8::Local<v8::debug::WeakMap> weakmap =
        v8::debug::WeakMap::New(env->GetIsolate());
    CHECK(!weakmap->Set(env.local(), weakmap, v8_num(1)).IsEmpty());
    CHECK(!weakmap->Get(env.local(), weakmap).IsEmpty());
    CHECK_EQ(0, break_point_hit_count);
  }

  {
    v8::Local<v8::Function> object_to_string =
        CompileRun("Object.prototype.toString").As<v8::Function>();
    SetBreakPoint(object_to_string, 0);

    // Run with breakpoint.
    break_point_hit_count = 0;
    CompileRun("var o = {}; o.toString();");
    CHECK_EQ(1, break_point_hit_count);

    break_point_hit_count = 0;
    v8::Local<v8::Object> object = v8::Object::New(env->GetIsolate());
    CHECK(!object->ObjectProtoToString(env.local()).IsEmpty());
    CHECK_EQ(0, break_point_hit_count);
  }

  {
    v8::Local<v8::Function> map_set =
        CompileRun("Map.prototype.set").As<v8::Function>();
    v8::Local<v8::Function> map_get =
        CompileRun("Map.prototype.get").As<v8::Function>();
    v8::Local<v8::Function> map_has =
        CompileRun("Map.prototype.has").As<v8::Function>();
    v8::Local<v8::Function> map_delete =
        CompileRun("Map.prototype.delete").As<v8::Function>();
    SetBreakPoint(map_set, 0);
    SetBreakPoint(map_get, 0);
    SetBreakPoint(map_has, 0);
    SetBreakPoint(map_delete, 0);

    // Run with breakpoint.
    break_point_hit_count = 0;
    CompileRun(
        "var m = new Map(); m.set(m, 1); m.get(m); m.has(m); m.delete(m);");
    CHECK_EQ(4, break_point_hit_count);

    break_point_hit_count = 0;
    v8::Local<v8::Map> map = v8::Map::New(env->GetIsolate());
    CHECK(!map->Set(env.local(), map, v8_num(1)).IsEmpty());
    CHECK(!map->Get(env.local(), map).IsEmpty());
    CHECK(map->Has(env.local(), map).FromJust());
    CHECK(map->Delete(env.local(), map).FromJust());
    CHECK_EQ(0, break_point_hit_count);
  }

  {
    v8::Local<v8::Function> set_add =
        CompileRun("Set.prototype.add").As<v8::Function>();
    v8::Local<v8::Function> set_get =
        CompileRun("Set.prototype.has").As<v8::Function>();
    v8::Local<v8::Function> set_delete =
        CompileRun("Set.prototype.delete").As<v8::Function>();
    SetBreakPoint(set_add, 0);
    SetBreakPoint(set_get, 0);
    SetBreakPoint(set_delete, 0);

    // Run with breakpoint.
    break_point_hit_count = 0;
    CompileRun("var s = new Set(); s.add(s); s.has(s); s.delete(s);");
    CHECK_EQ(3, break_point_hit_count);

    break_point_hit_count = 0;
    v8::Local<v8::Set> set = v8::Set::New(env->GetIsolate());
    CHECK(!set->Add(env.local(), set).IsEmpty());
    CHECK(set->Has(env.local(), set).FromJust());
    CHECK(set->Delete(env.local(), set).FromJust());
    CHECK_EQ(0, break_point_hit_count);
  }

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointJSBuiltin) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test JS builtin ===
  break_point_hit_count = 0;
  builtin = CompileRun("Array.prototype.sort").As<v8::Function>();

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0);
  CompileRun("[1,2,3].sort()");
  CHECK_EQ(1, break_point_hit_count);

  CompileRun("[1,2,3].sort()");
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("[1,2,3].sort()");
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointBoundBuiltin) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test bound function from a builtin ===
  break_point_hit_count = 0;
  builtin = CompileRun(
                "var boundrepeat = String.prototype.repeat.bind('a');"
                "String.prototype.repeat")
                .As<v8::Function>();
  ExpectString("boundrepeat(10)", "aaaaaaaaaa");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0);
  ExpectString("boundrepeat(10)", "aaaaaaaaaa");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  ExpectString("boundrepeat(10)", "aaaaaaaaaa");
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointConstructorBuiltin) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test Promise constructor ===
  break_point_hit_count = 0;
  builtin = CompileRun("Promise").As<v8::Function>();
  ExpectString("(new Promise(()=>{})).toString()", "[object Promise]");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "this != 1");
  ExpectString("(new Promise(()=>{})).toString()", "[object Promise]");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  ExpectString("(new Promise(()=>{})).toString()", "[object Promise]");
  CHECK_EQ(1, break_point_hit_count);

  // === Test Object constructor ===
  break_point_hit_count = 0;
  builtin = CompileRun("Object").As<v8::Function>();
  CompileRun("new Object()");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0);
  CompileRun("new Object()");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("new Object()");
  CHECK_EQ(1, break_point_hit_count);

  // === Test Number constructor ===
  break_point_hit_count = 0;
  builtin = CompileRun("Number").As<v8::Function>();
  CompileRun("new Number()");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0);
  CompileRun("new Number()");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("new Number()");
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointInlinedBuiltin) {
  i::FLAG_allow_natives_syntax = true;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test inlined builtin ===
  break_point_hit_count = 0;
  builtin = CompileRun("Math.sin").As<v8::Function>();
  CompileRun("function test(x) { return 1 + Math.sin(x) }");
  CompileRun(
      "%PrepareFunctionForOptimization(test);"
      "test(0.5); test(0.6);"
      "%OptimizeFunctionOnNextCall(test); test(0.7);");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "this != 1");
  CompileRun("Math.sin(0.1);");
  CHECK_EQ(1, break_point_hit_count);
  CompileRun("test(0.2);");
  CHECK_EQ(2, break_point_hit_count);

  // Re-optimize.
  CompileRun(
      "%PrepareFunctionForOptimization(test);"
      "%OptimizeFunctionOnNextCall(test);");
  ExpectBoolean("test(0.3) < 2", true);
  CHECK_EQ(3, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("test(0.3);");
  CHECK_EQ(3, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointInlineBoundBuiltin) {
  i::FLAG_allow_natives_syntax = true;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test inlined bound builtin ===
  break_point_hit_count = 0;

  builtin = CompileRun(
                "var boundrepeat = String.prototype.repeat.bind('a');"
                "String.prototype.repeat")
                .As<v8::Function>();
  CompileRun("function test(x) { return 'a' + boundrepeat(x) }");
  CompileRun(
      "%PrepareFunctionForOptimization(test);"
      "test(4); test(5);"
      "%OptimizeFunctionOnNextCall(test); test(6);");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "this != 1");
  CompileRun("'a'.repeat(2);");
  CHECK_EQ(1, break_point_hit_count);
  CompileRun("test(7);");
  CHECK_EQ(2, break_point_hit_count);

  // Re-optimize.
  CompileRun(
      "%PrepareFunctionForOptimization(f);"
      "%OptimizeFunctionOnNextCall(test);");
  CompileRun("test(8);");
  CHECK_EQ(3, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("test(9);");
  CHECK_EQ(3, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointInlinedConstructorBuiltin) {
  i::FLAG_allow_natives_syntax = true;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test inlined constructor builtin (regular construct builtin) ===
  break_point_hit_count = 0;
  builtin = CompileRun("Promise").As<v8::Function>();
  CompileRun("function test(x) { return new Promise(()=>x); }");
  CompileRun(
      "%PrepareFunctionForOptimization(test);"
      "test(4); test(5);"
      "%OptimizeFunctionOnNextCall(test); test(6);");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "this != 1");
  CompileRun("new Promise(()=>{});");
  CHECK_EQ(1, break_point_hit_count);
  CompileRun("test(7);");
  CHECK_EQ(2, break_point_hit_count);

  // Re-optimize.
  CompileRun(
      "%PrepareFunctionForOptimization(f);"
      "%OptimizeFunctionOnNextCall(test);");
  CompileRun("test(8);");
  CHECK_EQ(3, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("test(9);");
  CHECK_EQ(3, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointBuiltinConcurrentOpt) {
  i::FLAG_allow_natives_syntax = true;
  i::FLAG_block_concurrent_recompilation = true;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test concurrent optimization ===
  break_point_hit_count = 0;
  builtin = CompileRun("Math.sin").As<v8::Function>();
  CompileRun("function test(x) { return 1 + Math.sin(x) }");
  // Trigger concurrent compile job. It is suspended until unblock.
  CompileRun(
      "%PrepareFunctionForOptimization(test);"
      "test(0.5); test(0.6);"
      "%OptimizeFunctionOnNextCall(test, 'concurrent'); test(0.7);");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0);
  // Have the concurrent compile job finish now.
  CompileRun(
      "%UnblockConcurrentRecompilation();"
      "%GetOptimizationStatus(test, 'sync');");
  CompileRun("test(0.2);");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("test(0.3);");
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointBuiltinTFOperator) {
  i::FLAG_allow_natives_syntax = true;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test builtin represented as operator ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.prototype.indexOf").As<v8::Function>();
  CompileRun("function test(x) { return 1 + 'foo'.indexOf(x) }");
  CompileRun(
      "%PrepareFunctionForOptimization(f);"
      "test('a'); test('b');"
      "%OptimizeFunctionOnNextCall(test); test('c');");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0);
  CompileRun("'bar'.indexOf('x');");
  CHECK_EQ(1, break_point_hit_count);
  CompileRun("test('d');");
  CHECK_EQ(2, break_point_hit_count);

  // Re-optimize.
  CompileRun(
      "%PrepareFunctionForOptimization(f);"
      "%OptimizeFunctionOnNextCall(test);");
  CompileRun("test('e');");
  CHECK_EQ(3, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("test('f');");
  CHECK_EQ(3, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointBuiltinNewContext) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

// === Test builtin from a new context ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.prototype.repeat").As<v8::Function>();
  CompileRun("'a'.repeat(10)");
  CHECK_EQ(0, break_point_hit_count);
  // Set breakpoint.
  bp = SetBreakPoint(builtin, 0);

  {
    // Create and use new context after breakpoint has been set.
    v8::HandleScope handle_scope(env->GetIsolate());
    v8::Local<v8::Context> new_context = v8::Context::New(env->GetIsolate());
    v8::Context::Scope context_scope(new_context);

    // Run with breakpoint.
    CompileRun("'b'.repeat(10)");
    CHECK_EQ(1, break_point_hit_count);

    CompileRun("'b'.repeat(10)");
    CHECK_EQ(2, break_point_hit_count);

    // Run without breakpoints.
    ClearBreakPoint(bp);
    CompileRun("'b'.repeat(10)");
    CHECK_EQ(2, break_point_hit_count);
  }

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

void NoOpFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& args) {
  args.GetReturnValue().Set(v8_num(2));
}

TEST(BreakPointApiFunction) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  i::Handle<i::BreakPoint> bp;

  v8::Local<v8::FunctionTemplate> function_template =
      v8::FunctionTemplate::New(env->GetIsolate(), NoOpFunctionCallback);

  v8::Local<v8::Function> function =
      function_template->GetFunction(env.local()).ToLocalChecked();

  env->Global()->Set(env.local(), v8_str("f"), function).ToChecked();

  // === Test simple builtin ===
  break_point_hit_count = 0;

  // Run with breakpoint.
  bp = SetBreakPoint(function, 0, "this != 1");
  ExpectInt32("f()", 2);
  CHECK_EQ(1, break_point_hit_count);

  ExpectInt32("f()", 2);
  CHECK_EQ(2, break_point_hit_count);

  // Direct call through API does not trigger breakpoint.
  function->Call(env.local(), v8::Undefined(env->GetIsolate()), 0, nullptr)
      .ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  ExpectInt32("f()", 2);
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointApiConstructor) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  i::Handle<i::BreakPoint> bp;

  v8::Local<v8::FunctionTemplate> function_template =
      v8::FunctionTemplate::New(env->GetIsolate(), NoOpFunctionCallback);

  v8::Local<v8::Function> function =
      function_template->GetFunction(env.local()).ToLocalChecked();

  env->Global()->Set(env.local(), v8_str("f"), function).ToChecked();

  // === Test simple builtin ===
  break_point_hit_count = 0;

  // Run with breakpoint.
  bp = SetBreakPoint(function, 0, "this != 1");
  CompileRun("new f()");
  CHECK_EQ(1, break_point_hit_count);
  CompileRun("new f()");
  CHECK_EQ(2, break_point_hit_count);

  // Direct call through API does not trigger breakpoint.
  function->NewInstance(env.local()).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("new f()");
  CHECK_EQ(2, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

void GetWrapperCallback(const v8::FunctionCallbackInfo<v8::Value>& args) {
  args.GetReturnValue().Set(
      args[0]
          .As<v8::Object>()
          ->Get(args.GetIsolate()->GetCurrentContext(), args[1])
          .ToLocalChecked());
}

TEST(BreakPointApiGetter) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  i::Handle<i::BreakPoint> bp;

  v8::Local<v8::FunctionTemplate> function_template =
      v8::FunctionTemplate::New(env->GetIsolate(), NoOpFunctionCallback);
  v8::Local<v8::FunctionTemplate> get_template =
      v8::FunctionTemplate::New(env->GetIsolate(), GetWrapperCallback);

  v8::Local<v8::Function> function =
      function_template->GetFunction(env.local()).ToLocalChecked();
  v8::Local<v8::Function> get =
      get_template->GetFunction(env.local()).ToLocalChecked();

  env->Global()->Set(env.local(), v8_str("f"), function).ToChecked();
  env->Global()->Set(env.local(), v8_str("get_wrapper"), get).ToChecked();
  CompileRun(
      "var o = {};"
      "Object.defineProperty(o, 'f', { get: f, enumerable: true });");

  // === Test API builtin as getter ===
  break_point_hit_count = 0;

  // Run with breakpoint.
  bp = SetBreakPoint(function, 0);
  CompileRun("get_wrapper(o, 'f')");
  CHECK_EQ(0, break_point_hit_count);

  CompileRun("o.f");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("get_wrapper(o, 'f', 2)");
  CompileRun("o.f");
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

void SetWrapperCallback(const v8::FunctionCallbackInfo<v8::Value>& args) {
  CHECK(args[0]
            .As<v8::Object>()
            ->Set(args.GetIsolate()->GetCurrentContext(), args[1], args[2])
            .FromJust());
}

TEST(BreakPointApiSetter) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  i::Handle<i::BreakPoint> bp;

  v8::Local<v8::FunctionTemplate> function_template =
      v8::FunctionTemplate::New(env->GetIsolate(), NoOpFunctionCallback);
  v8::Local<v8::FunctionTemplate> set_template =
      v8::FunctionTemplate::New(env->GetIsolate(), SetWrapperCallback);

  v8::Local<v8::Function> function =
      function_template->GetFunction(env.local()).ToLocalChecked();
  v8::Local<v8::Function> set =
      set_template->GetFunction(env.local()).ToLocalChecked();

  env->Global()->Set(env.local(), v8_str("f"), function).ToChecked();
  env->Global()->Set(env.local(), v8_str("set_wrapper"), set).ToChecked();

  CompileRun(
      "var o = {};"
      "Object.defineProperty(o, 'f', { set: f, enumerable: true });");

  // === Test API builtin as setter ===
  break_point_hit_count = 0;

  // Run with breakpoint.
  bp = SetBreakPoint(function, 0);

  CompileRun("o.f = 3");
  CHECK_EQ(1, break_point_hit_count);

  CompileRun("set_wrapper(o, 'f', 2)");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("o.f = 3");
  CHECK_EQ(1, break_point_hit_count);

  // === Test API builtin as setter, with condition ===
  break_point_hit_count = 0;

  // Run with breakpoint.
  bp = SetBreakPoint(function, 0, "arguments[0] == 3");
  CompileRun("set_wrapper(o, 'f', 2)");
  CHECK_EQ(0, break_point_hit_count);

  CompileRun("set_wrapper(o, 'f', 3)");
  CHECK_EQ(0, break_point_hit_count);

  CompileRun("o.f = 3");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("set_wrapper(o, 'f', 2)");
  CompileRun("o.f = 3");
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointApiAccessor) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  i::Handle<i::BreakPoint> bp;

  // Create 'foo' class, with a hidden property.
  v8::Local<v8::ObjectTemplate> obj_template =
      v8::ObjectTemplate::New(env->GetIsolate());
  v8::Local<v8::FunctionTemplate> accessor_template =
      v8::FunctionTemplate::New(env->GetIsolate(), NoOpFunctionCallback);
  obj_template->SetAccessorProperty(v8_str("f"), accessor_template,
                                    accessor_template);
  v8::Local<v8::Object> obj =
      obj_template->NewInstance(env.local()).ToLocalChecked();
  env->Global()->Set(env.local(), v8_str("o"), obj).ToChecked();

  v8::Local<v8::Function> function =
      CompileRun("Object.getOwnPropertyDescriptor(o, 'f').set")
          .As<v8::Function>();

  // === Test API accessor ===
  break_point_hit_count = 0;

  CompileRun("function get_loop() { for (var i = 0; i < 10; i++) o.f }");
  CompileRun("function set_loop() { for (var i = 0; i < 10; i++) o.f = 2 }");

  CompileRun("get_loop(); set_loop();");  // Initialize ICs.

  // Run with breakpoint.
  bp = SetBreakPoint(function, 0);

  CompileRun("o.f = 3");
  CHECK_EQ(1, break_point_hit_count);

  CompileRun("o.f");
  CHECK_EQ(2, break_point_hit_count);

  CompileRun("for (var i = 0; i < 10; i++) o.f");
  CHECK_EQ(12, break_point_hit_count);

  CompileRun("get_loop();");
  CHECK_EQ(22, break_point_hit_count);

  CompileRun("for (var i = 0; i < 10; i++) o.f = 2");
  CHECK_EQ(32, break_point_hit_count);

  CompileRun("set_loop();");
  CHECK_EQ(42, break_point_hit_count);

  // Test that the break point also works when we install the function
  // template on a new property (with a fresh AccessorPair instance).
  v8::Local<v8::ObjectTemplate> baz_template =
      v8::ObjectTemplate::New(env->GetIsolate());
  baz_template->SetAccessorProperty(v8_str("g"), accessor_template,
                                    accessor_template);
  v8::Local<v8::Object> baz =
      baz_template->NewInstance(env.local()).ToLocalChecked();
  env->Global()->Set(env.local(), v8_str("b"), baz).ToChecked();

  CompileRun("b.g = 4");
  CHECK_EQ(43, break_point_hit_count);

  CompileRun("b.g");
  CHECK_EQ(44, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("o.f = 3");
  CompileRun("o.f");
  CHECK_EQ(44, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointInlineApiFunction) {
  i::FLAG_allow_natives_syntax = true;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  i::Handle<i::BreakPoint> bp;

  v8::Local<v8::FunctionTemplate> function_template =
      v8::FunctionTemplate::New(env->GetIsolate(), NoOpFunctionCallback);

  v8::Local<v8::Function> function =
      function_template->GetFunction(env.local()).ToLocalChecked();

  env->Global()->Set(env.local(), v8_str("f"), function).ToChecked();
  CompileRun(
      "function g() { return 1 +  f(); };"
      "%PrepareFunctionForOptimization(g);");

  // === Test simple builtin ===
  break_point_hit_count = 0;

  // Run with breakpoint.
  bp = SetBreakPoint(function, 0);
  ExpectInt32("g()", 3);
  CHECK_EQ(1, break_point_hit_count);

  ExpectInt32("g()", 3);
  CHECK_EQ(2, break_point_hit_count);

  CompileRun("%OptimizeFunctionOnNextCall(g)");
  ExpectInt32("g()", 3);
  CHECK_EQ(3, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  ExpectInt32("g()", 3);
  CHECK_EQ(3, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

// Test that a break point can be set at a return store location.
TEST(BreakPointConditionBuiltin) {
  i::FLAG_allow_natives_syntax = true;
  i::FLAG_block_concurrent_recompilation = true;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  v8::Local<v8::Function> builtin;
  i::Handle<i::BreakPoint> bp;

  // === Test global variable ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.prototype.repeat").As<v8::Function>();
  CompileRun("var condition = false");
  CompileRun("'a'.repeat(10)");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "condition == true");
  CompileRun("'b'.repeat(10)");
  CHECK_EQ(0, break_point_hit_count);

  CompileRun("condition = true");
  CompileRun("'b'.repeat(10)");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("'b'.repeat(10)");
  CHECK_EQ(1, break_point_hit_count);

  // === Test arguments ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.prototype.repeat").As<v8::Function>();
  CompileRun("function f(x) { return 'a'.repeat(x * 2); }");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "arguments[0] == 20");
  ExpectString("f(5)", "aaaaaaaaaa");
  CHECK_EQ(0, break_point_hit_count);

  ExpectString("f(10)", "aaaaaaaaaaaaaaaaaaaa");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  ExpectString("f(10)", "aaaaaaaaaaaaaaaaaaaa");
  CHECK_EQ(1, break_point_hit_count);

  // === Test adapted arguments ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.prototype.repeat").As<v8::Function>();
  CompileRun("function f(x) { return 'a'.repeat(x * 2, x); }");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0,
                     "arguments[1] == 10 && arguments[2] == undefined");
  ExpectString("f(5)", "aaaaaaaaaa");
  CHECK_EQ(0, break_point_hit_count);

  ExpectString("f(10)", "aaaaaaaaaaaaaaaaaaaa");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  ExpectString("f(10)", "aaaaaaaaaaaaaaaaaaaa");
  CHECK_EQ(1, break_point_hit_count);

  // === Test var-arg builtins ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.fromCharCode").As<v8::Function>();
  CompileRun("function f() { return String.fromCharCode(1, 2, 3); }");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "arguments.length == 3 && arguments[1] == 2");
  CompileRun("f(1, 2, 3)");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("f(1, 2, 3)");
  CHECK_EQ(1, break_point_hit_count);

  // === Test rest arguments ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.fromCharCode").As<v8::Function>();
  CompileRun("function f(...args) { return String.fromCharCode(...args); }");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "arguments.length == 3 && arguments[1] == 2");
  CompileRun("f(1, 2, 3)");
  CHECK_EQ(1, break_point_hit_count);

  ClearBreakPoint(bp);
  CompileRun("f(1, 3, 3)");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("f(1, 2, 3)");
  CHECK_EQ(1, break_point_hit_count);

  // === Test receiver ===
  break_point_hit_count = 0;
  builtin = CompileRun("String.prototype.repeat").As<v8::Function>();
  CompileRun("function f(x) { return x.repeat(10); }");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  bp = SetBreakPoint(builtin, 0, "this == 'a'");
  ExpectString("f('b')", "bbbbbbbbbb");
  CHECK_EQ(0, break_point_hit_count);

  ExpectString("f('a')", "aaaaaaaaaa");
  CHECK_EQ(1, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  ExpectString("f('a')", "aaaaaaaaaa");
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

TEST(BreakPointInlining) {
  i::FLAG_allow_natives_syntax = true;
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  break_point_hit_count = 0;
  v8::Local<v8::Function> inlinee =
      CompileRun("function f(x) { return x*2; } f").As<v8::Function>();
  CompileRun("function test(x) { return 1 + f(x) }");
  CompileRun(
      "%PrepareFunctionForOptimization(test);"
      "test(0.5); test(0.6);"
      "%OptimizeFunctionOnNextCall(test); test(0.7);");
  CHECK_EQ(0, break_point_hit_count);

  // Run with breakpoint.
  i::Handle<i::BreakPoint> bp = SetBreakPoint(inlinee, 0);
  CompileRun("f(0.1);");
  CHECK_EQ(1, break_point_hit_count);
  CompileRun("test(0.2);");
  CHECK_EQ(2, break_point_hit_count);

  // Re-optimize.
  CompileRun(
      "%PrepareFunctionForOptimization(test);"
      "%OptimizeFunctionOnNextCall(test);");
  CompileRun("test(0.3);");
  CHECK_EQ(3, break_point_hit_count);

  // Run without breakpoints.
  ClearBreakPoint(bp);
  CompileRun("test(0.3);");
  CHECK_EQ(3, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

static void CallWithBreakPoints(v8::Local<v8::Context> context,
                                v8::Local<v8::Object> recv,
                                v8::Local<v8::Function> f,
                                int break_point_count, int call_count) {
  break_point_hit_count = 0;
  for (int i = 0; i < call_count; i++) {
    f->Call(context, recv, 0, nullptr).ToLocalChecked();
    CHECK_EQ((i + 1) * break_point_count, break_point_hit_count);
  }
}


// Test GC during break point processing.
TEST(GCDuringBreakPointProcessing) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  v8::Local<v8::Context> context = env.local();

  DebugEventBreakPointCollectGarbage delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  v8::Local<v8::Function> foo;

  // Test IC store break point with garbage collection.
  foo = CompileFunction(&env, "function foo(){bar=0;}", "foo");
  SetBreakPoint(foo, 0);
  CallWithBreakPoints(context, env->Global(), foo, 1, 10);

  // Test IC load break point with garbage collection.
  foo = CompileFunction(&env, "bar=1;function foo(){var x=bar;}", "foo");
  SetBreakPoint(foo, 0);
  CallWithBreakPoints(context, env->Global(), foo, 1, 10);

  // Test IC call break point with garbage collection.
  foo = CompileFunction(&env, "function bar(){};function foo(){bar();}", "foo");
  SetBreakPoint(foo, 0);
  CallWithBreakPoints(context, env->Global(), foo, 1, 10);

  // Test return break point with garbage collection.
  foo = CompileFunction(&env, "function foo(){}", "foo");
  SetBreakPoint(foo, 0);
  CallWithBreakPoints(context, env->Global(), foo, 1, 25);

  // Test debug break slot break point with garbage collection.
  foo = CompileFunction(&env, "function foo(){var a;}", "foo");
  SetBreakPoint(foo, 0);
  CallWithBreakPoints(context, env->Global(), foo, 1, 25);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Call the function three times with different garbage collections in between
// and make sure that the break point survives.
static void CallAndGC(v8::Local<v8::Context> context,
                      v8::Local<v8::Object> recv, v8::Local<v8::Function> f) {
  break_point_hit_count = 0;

  for (int i = 0; i < 3; i++) {
    // Call function.
    f->Call(context, recv, 0, nullptr).ToLocalChecked();
    CHECK_EQ(1 + i * 3, break_point_hit_count);

    // Scavenge and call function.
    CcTest::CollectGarbage(v8::internal::NEW_SPACE);
    f->Call(context, recv, 0, nullptr).ToLocalChecked();
    CHECK_EQ(2 + i * 3, break_point_hit_count);

    // Mark sweep (and perhaps compact) and call function.
    CcTest::CollectAllGarbage();
    f->Call(context, recv, 0, nullptr).ToLocalChecked();
    CHECK_EQ(3 + i * 3, break_point_hit_count);
  }
}


// Test that a break point can be set at a return store location.
TEST(BreakPointSurviveGC) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  v8::Local<v8::Context> context = env.local();

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  v8::Local<v8::Function> foo;

  // Test IC store break point with garbage collection.
  {
    CompileFunction(&env, "function foo(){}", "foo");
    foo = CompileFunction(&env, "function foo(){bar=0;}", "foo");
    SetBreakPoint(foo, 0);
  }
  CallAndGC(context, env->Global(), foo);

  // Test IC load break point with garbage collection.
  {
    CompileFunction(&env, "function foo(){}", "foo");
    foo = CompileFunction(&env, "bar=1;function foo(){var x=bar;}", "foo");
    SetBreakPoint(foo, 0);
  }
  CallAndGC(context, env->Global(), foo);

  // Test IC call break point with garbage collection.
  {
    CompileFunction(&env, "function foo(){}", "foo");
    foo = CompileFunction(&env,
                          "function bar(){};function foo(){bar();}",
                          "foo");
    SetBreakPoint(foo, 0);
  }
  CallAndGC(context, env->Global(), foo);

  // Test return break point with garbage collection.
  {
    CompileFunction(&env, "function foo(){}", "foo");
    foo = CompileFunction(&env, "function foo(){}", "foo");
    SetBreakPoint(foo, 0);
  }
  CallAndGC(context, env->Global(), foo);

  // Test non IC break point with garbage collection.
  {
    CompileFunction(&env, "function foo(){}", "foo");
    foo = CompileFunction(&env, "function foo(){var bar=0;}", "foo");
    SetBreakPoint(foo, 0);
  }
  CallAndGC(context, env->Global(), foo);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

// Test that the debugger statement causes a break.
TEST(DebuggerStatement) {
  break_point_hit_count = 0;
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
  v8::Local<v8::Context> context = env.local();
  v8::Script::Compile(context,
                      v8_str(env->GetIsolate(), "function bar(){debugger}"))
      .ToLocalChecked()
      ->Run(context)
      .ToLocalChecked();
  v8::Script::Compile(
      context, v8_str(env->GetIsolate(), "function foo(){debugger;debugger;}"))
      .ToLocalChecked()
      ->Run(context)
      .ToLocalChecked();
  v8::Local<v8::Function> foo = v8::Local<v8::Function>::Cast(
      env->Global()
          ->Get(context, v8_str(env->GetIsolate(), "foo"))
          .ToLocalChecked());
  v8::Local<v8::Function> bar = v8::Local<v8::Function>::Cast(
      env->Global()
          ->Get(context, v8_str(env->GetIsolate(), "bar"))
          .ToLocalChecked());

  // Run function with debugger statement
  bar->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(1, break_point_hit_count);

  // Run function with two debugger statement
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(3, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test setting a breakpoint on the debugger statement.
TEST(DebuggerStatementBreakpoint) {
    break_point_hit_count = 0;
    LocalContext env;
    v8::HandleScope scope(env->GetIsolate());
    v8::Local<v8::Context> context = env.local();
    DebugEventCounter delegate;
    v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);
    v8::Script::Compile(context,
                        v8_str(env->GetIsolate(), "function foo(){debugger;}"))
        .ToLocalChecked()
        ->Run(context)
        .ToLocalChecked();
    v8::Local<v8::Function> foo = v8::Local<v8::Function>::Cast(
        env->Global()
            ->Get(context, v8_str(env->GetIsolate(), "foo"))
            .ToLocalChecked());

    // The debugger statement triggers breakpoint hit
    foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
    CHECK_EQ(1, break_point_hit_count);

    i::Handle<i::BreakPoint> bp = SetBreakPoint(foo, 0);

    // Set breakpoint does not duplicate hits
    foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
    CHECK_EQ(2, break_point_hit_count);

    ClearBreakPoint(bp);
    v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
    CheckDebuggerUnloaded();
}


// Test that the conditional breakpoints work event if code generation from
// strings is prohibited in the debugee context.
TEST(ConditionalBreakpointWithCodeGenerationDisallowed) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  v8::Local<v8::Context> context = env.local();
  v8::Local<v8::Function> foo = CompileFunction(&env,
    "function foo(x) {\n"
    "  var s = 'String value2';\n"
    "  return s + x;\n"
    "}",
    "foo");

  // Set conditional breakpoint with condition 'true'.
  SetBreakPoint(foo, 4, "true");

  break_point_hit_count = 0;
  env->AllowCodeGenerationFromStrings(false);
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Simple test of the stepping mechanism using only store ICs.
TEST(DebugStepLinear) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Create a function for testing stepping.
  v8::Local<v8::Function> foo = CompileFunction(&env,
                                                "function foo(){a=1;b=1;c=1;}",
                                                "foo");

  // Run foo to allow it to get optimized.
  CompileRun("a=0; b=0; c=0; foo();");

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  SetBreakPoint(foo, 3);

  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Context> context = env.local();
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // With stepping all break locations are hit.
  CHECK_EQ(4, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();

  // Register a debug event listener which just counts.
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  SetBreakPoint(foo, 3);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // Without stepping only active break points are hit.
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test of the stepping mechanism for keyed load in a loop.
TEST(DebugStepKeyedLoadLoop) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  // Create a function for testing stepping of keyed load. The statement 'y=1'
  // is there to have more than one breakable statement in the loop, TODO(315).
  v8::Local<v8::Function> foo = CompileFunction(
      &env,
      "function foo(a) {\n"
      "  var x;\n"
      "  var len = a.length;\n"
      "  for (var i = 0; i < len; i++) {\n"
      "    y = 1;\n"
      "    x = a[i];\n"
      "  }\n"
      "}\n"
      "y=0\n",
      "foo");

  v8::Local<v8::Context> context = env.local();
  // Create array [0,1,2,3,4,5,6,7,8,9]
  v8::Local<v8::Array> a = v8::Array::New(env->GetIsolate(), 10);
  for (int i = 0; i < 10; i++) {
    CHECK(a->Set(context, v8::Number::New(env->GetIsolate(), i),
                 v8::Number::New(env->GetIsolate(), i))
              .FromJust());
  }

  // Call function without any break points to ensure inlining is in place.
  const int kArgc = 1;
  v8::Local<v8::Value> args[kArgc] = {a};
  foo->Call(context, env->Global(), kArgc, args).ToLocalChecked();

  // Set up break point and step through the function.
  SetBreakPoint(foo, 3);
  run_step.set_step_action(StepNext);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), kArgc, args).ToLocalChecked();

  // With stepping all break locations are hit.
  CHECK_EQ(44, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test of the stepping mechanism for keyed store in a loop.
TEST(DebugStepKeyedStoreLoop) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  // Create a function for testing stepping of keyed store. The statement 'y=1'
  // is there to have more than one breakable statement in the loop, TODO(315).
  v8::Local<v8::Function> foo = CompileFunction(
      &env,
      "function foo(a) {\n"
      "  var len = a.length;\n"
      "  for (var i = 0; i < len; i++) {\n"
      "    y = 1;\n"
      "    a[i] = 42;\n"
      "  }\n"
      "}\n"
      "y=0\n",
      "foo");

  v8::Local<v8::Context> context = env.local();
  // Create array [0,1,2,3,4,5,6,7,8,9]
  v8::Local<v8::Array> a = v8::Array::New(env->GetIsolate(), 10);
  for (int i = 0; i < 10; i++) {
    CHECK(a->Set(context, v8::Number::New(env->GetIsolate(), i),
                 v8::Number::New(env->GetIsolate(), i))
              .FromJust());
  }

  // Call function without any break points to ensure inlining is in place.
  const int kArgc = 1;
  v8::Local<v8::Value> args[kArgc] = {a};
  foo->Call(context, env->Global(), kArgc, args).ToLocalChecked();

  // Set up break point and step through the function.
  SetBreakPoint(foo, 3);
  run_step.set_step_action(StepNext);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), kArgc, args).ToLocalChecked();

  // With stepping all break locations are hit.
  CHECK_EQ(44, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test of the stepping mechanism for named load in a loop.
TEST(DebugStepNamedLoadLoop) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping of named load.
  v8::Local<v8::Function> foo = CompileFunction(
      &env,
      "function foo() {\n"
          "  var a = [];\n"
          "  var s = \"\";\n"
          "  for (var i = 0; i < 10; i++) {\n"
          "    var v = new V(i, i + 1);\n"
          "    v.y;\n"
          "    a.length;\n"  // Special case: array length.
          "    s.length;\n"  // Special case: string length.
          "  }\n"
          "}\n"
          "function V(x, y) {\n"
          "  this.x = x;\n"
          "  this.y = y;\n"
          "}\n",
          "foo");

  // Call function without any break points to ensure inlining is in place.
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // Set up break point and step through the function.
  SetBreakPoint(foo, 4);
  run_step.set_step_action(StepNext);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // With stepping all break locations are hit.
  CHECK_EQ(65, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


static void DoDebugStepNamedStoreLoop(int expected) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  // Create a function for testing stepping of named store.
  v8::Local<v8::Context> context = env.local();
  v8::Local<v8::Function> foo = CompileFunction(
      &env,
      "function foo() {\n"
          "  var a = {a:1};\n"
          "  for (var i = 0; i < 10; i++) {\n"
          "    a.a = 2\n"
          "  }\n"
          "}\n",
          "foo");

  // Call function without any break points to ensure inlining is in place.
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // Set up break point and step through the function.
  SetBreakPoint(foo, 3);
  run_step.set_step_action(StepNext);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // With stepping all expected break locations are hit.
  CHECK_EQ(expected, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test of the stepping mechanism for named load in a loop.
TEST(DebugStepNamedStoreLoop) { DoDebugStepNamedStoreLoop(34); }

// Test the stepping mechanism with different ICs.
TEST(DebugStepLinearMixedICs) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping.
  v8::Local<v8::Function> foo = CompileFunction(&env,
      "function bar() {};"
      "function foo() {"
      "  var x;"
      "  var index='name';"
      "  var y = {};"
      "  a=1;b=2;x=a;y[index]=3;x=y[index];bar();}", "foo");

  // Run functions to allow them to get optimized.
  CompileRun("a=0; b=0; bar(); foo();");

  SetBreakPoint(foo, 0);

  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // With stepping all break locations are hit.
  CHECK_EQ(10, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();

  // Register a debug event listener which just counts.
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  SetBreakPoint(foo, 0);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // Without stepping only active break points are hit.
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepDeclarations) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const char* src = "function foo() { "
                    "  var a;"
                    "  var b = 1;"
                    "  var c = foo;"
                    "  var d = Math.floor;"
                    "  var e = b + d(1.2);"
                    "}"
                    "foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");

  SetBreakPoint(foo, 0);

  // Stepping through the declarations.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(5, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepLocals) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const char* src = "function foo() { "
                    "  var a,b;"
                    "  a = 1;"
                    "  b = a + 2;"
                    "  b = 1 + 2 + 3;"
                    "  a = Math.floor(b);"
                    "}"
                    "foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");

  SetBreakPoint(foo, 0);

  // Stepping through the declarations.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(5, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepIf) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const int argc = 1;
  const char* src = "function foo(x) { "
                    "  a = 1;"
                    "  if (x) {"
                    "    b = 1;"
                    "  } else {"
                    "    c = 1;"
                    "    d = 1;"
                    "  }"
                    "}"
                    "a=0; b=0; c=0; d=0; foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");
  SetBreakPoint(foo, 0);

  // Stepping through the true part.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_true[argc] = {v8::True(isolate)};
  foo->Call(context, env->Global(), argc, argv_true).ToLocalChecked();
  CHECK_EQ(4, break_point_hit_count);

  // Stepping through the false part.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_false[argc] = {v8::False(isolate)};
  foo->Call(context, env->Global(), argc, argv_false).ToLocalChecked();
  CHECK_EQ(5, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepSwitch) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const int argc = 1;
  const char* src = "function foo(x) { "
                    "  a = 1;"
                    "  switch (x) {"
                    "    case 1:"
                    "      b = 1;"
                    "    case 2:"
                    "      c = 1;"
                    "      break;"
                    "    case 3:"
                    "      d = 1;"
                    "      e = 1;"
                    "      f = 1;"
                    "      break;"
                    "  }"
                    "}"
                    "a=0; b=0; c=0; d=0; e=0; f=0; foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");
  SetBreakPoint(foo, 0);

  // One case with fall-through.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_1[argc] = {v8::Number::New(isolate, 1)};
  foo->Call(context, env->Global(), argc, argv_1).ToLocalChecked();
  CHECK_EQ(6, break_point_hit_count);

  // Another case.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_2[argc] = {v8::Number::New(isolate, 2)};
  foo->Call(context, env->Global(), argc, argv_2).ToLocalChecked();
  CHECK_EQ(5, break_point_hit_count);

  // Last case.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_3[argc] = {v8::Number::New(isolate, 3)};
  foo->Call(context, env->Global(), argc, argv_3).ToLocalChecked();
  CHECK_EQ(7, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepWhile) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const int argc = 1;
  const char* src = "function foo(x) { "
                    "  var a = 0;"
                    "  while (a < x) {"
                    "    a++;"
                    "  }"
                    "}"
                    "foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");
  SetBreakPoint(foo, 8);  // "var a = 0;"

  // Looping 0 times.  We still should break at the while-condition once.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_0[argc] = {v8::Number::New(isolate, 0)};
  foo->Call(context, env->Global(), argc, argv_0).ToLocalChecked();
  CHECK_EQ(3, break_point_hit_count);

  // Looping 10 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_10[argc] = {v8::Number::New(isolate, 10)};
  foo->Call(context, env->Global(), argc, argv_10).ToLocalChecked();
  CHECK_EQ(23, break_point_hit_count);

  // Looping 100 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_100[argc] = {v8::Number::New(isolate, 100)};
  foo->Call(context, env->Global(), argc, argv_100).ToLocalChecked();
  CHECK_EQ(203, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepDoWhile) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const int argc = 1;
  const char* src = "function foo(x) { "
                    "  var a = 0;"
                    "  do {"
                    "    a++;"
                    "  } while (a < x)"
                    "}"
                    "foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");
  SetBreakPoint(foo, 8);  // "var a = 0;"

  // Looping 0 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_0[argc] = {v8::Number::New(isolate, 0)};
  foo->Call(context, env->Global(), argc, argv_0).ToLocalChecked();
  CHECK_EQ(4, break_point_hit_count);

  // Looping 10 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_10[argc] = {v8::Number::New(isolate, 10)};
  foo->Call(context, env->Global(), argc, argv_10).ToLocalChecked();
  CHECK_EQ(22, break_point_hit_count);

  // Looping 100 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_100[argc] = {v8::Number::New(isolate, 100)};
  foo->Call(context, env->Global(), argc, argv_100).ToLocalChecked();
  CHECK_EQ(202, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepFor) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const int argc = 1;
  const char* src = "function foo(x) { "
                    "  a = 1;"
                    "  for (i = 0; i < x; i++) {"
                    "    b = 1;"
                    "  }"
                    "}"
                    "a=0; b=0; i=0; foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");

  SetBreakPoint(foo, 8);  // "a = 1;"

  // Looping 0 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_0[argc] = {v8::Number::New(isolate, 0)};
  foo->Call(context, env->Global(), argc, argv_0).ToLocalChecked();
  CHECK_EQ(4, break_point_hit_count);

  // Looping 10 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_10[argc] = {v8::Number::New(isolate, 10)};
  foo->Call(context, env->Global(), argc, argv_10).ToLocalChecked();
  CHECK_EQ(34, break_point_hit_count);

  // Looping 100 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_100[argc] = {v8::Number::New(isolate, 100)};
  foo->Call(context, env->Global(), argc, argv_100).ToLocalChecked();
  CHECK_EQ(304, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepForContinue) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const int argc = 1;
  const char* src = "function foo(x) { "
                    "  var a = 0;"
                    "  var b = 0;"
                    "  var c = 0;"
                    "  for (var i = 0; i < x; i++) {"
                    "    a++;"
                    "    if (a % 2 == 0) continue;"
                    "    b++;"
                    "    c++;"
                    "  }"
                    "  return b;"
                    "}"
                    "foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");
  v8::Local<v8::Value> result;
  SetBreakPoint(foo, 8);  // "var a = 0;"

  // Each loop generates 4 or 5 steps depending on whether a is equal.

  // Looping 10 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_10[argc] = {v8::Number::New(isolate, 10)};
  result = foo->Call(context, env->Global(), argc, argv_10).ToLocalChecked();
  CHECK_EQ(5, result->Int32Value(context).FromJust());
  CHECK_EQ(62, break_point_hit_count);

  // Looping 100 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_100[argc] = {v8::Number::New(isolate, 100)};
  result = foo->Call(context, env->Global(), argc, argv_100).ToLocalChecked();
  CHECK_EQ(50, result->Int32Value(context).FromJust());
  CHECK_EQ(557, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepForBreak) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const int argc = 1;
  const char* src = "function foo(x) { "
                    "  var a = 0;"
                    "  var b = 0;"
                    "  var c = 0;"
                    "  for (var i = 0; i < 1000; i++) {"
                    "    a++;"
                    "    if (a == x) break;"
                    "    b++;"
                    "    c++;"
                    "  }"
                    "  return b;"
                    "}"
                    "foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");
  v8::Local<v8::Value> result;
  SetBreakPoint(foo, 8);  // "var a = 0;"

  // Each loop generates 5 steps except for the last (when break is executed)
  // which only generates 4.

  // Looping 10 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_10[argc] = {v8::Number::New(isolate, 10)};
  result = foo->Call(context, env->Global(), argc, argv_10).ToLocalChecked();
  CHECK_EQ(9, result->Int32Value(context).FromJust());
  CHECK_EQ(64, break_point_hit_count);

  // Looping 100 times.
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  v8::Local<v8::Value> argv_100[argc] = {v8::Number::New(isolate, 100)};
  result = foo->Call(context, env->Global(), argc, argv_100).ToLocalChecked();
  CHECK_EQ(99, result->Int32Value(context).FromJust());
  CHECK_EQ(604, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepForIn) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  v8::Local<v8::Function> foo;
  const char* src_1 = "function foo() { "
                      "  var a = [1, 2];"
                      "  for (x in a) {"
                      "    b = 0;"
                      "  }"
                      "}"
                      "foo()";
  foo = CompileFunction(&env, src_1, "foo");
  SetBreakPoint(foo, 0);  // "var a = ..."

  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(8, break_point_hit_count);

  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const char* src_2 = "function foo() { "
                      "  var a = {a:[1, 2, 3]};"
                      "  for (x in a.a) {"
                      "    b = 0;"
                      "  }"
                      "}"
                      "foo()";
  foo = CompileFunction(&env, src_2, "foo");
  SetBreakPoint(foo, 0);  // "var a = ..."

  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(10, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugStepWith) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const char* src = "function foo(x) { "
                    "  var a = {};"
                    "  with (a) {}"
                    "  with (b) {}"
                    "}"
                    "foo()";
  CHECK(env->Global()
            ->Set(context, v8_str(env->GetIsolate(), "b"),
                  v8::Object::New(env->GetIsolate()))
            .FromJust());
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");
  v8::Local<v8::Value> result;
  SetBreakPoint(foo, 8);  // "var a = {};"

  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(4, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


TEST(DebugConditional) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping. Run it to allow it to get
  // optimized.
  const char* src =
      "function foo(x) { "
      "  return x ? 1 : 2;"
      "}"
      "foo()";
  v8::Local<v8::Function> foo = CompileFunction(&env, src, "foo");
  SetBreakPoint(foo, 0);  // "var a;"

  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  const int argc = 1;
  v8::Local<v8::Value> argv_true[argc] = {v8::True(isolate)};
  foo->Call(context, env->Global(), argc, argv_true).ToLocalChecked();
  CHECK_EQ(2, break_point_hit_count);

  // Get rid of the debug event listener.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

// Test that step in does not step into native functions.
TEST(DebugStepNatives) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Create a function for testing stepping.
  v8::Local<v8::Function> foo =
      CompileFunction(&env, "function foo(){debugger;Math.sin(1);}", "foo");

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // With stepping all break locations are hit.
  CHECK_EQ(3, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();

  // Register a debug event listener which just counts.
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // Without stepping only active break points are hit.
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

// Test that step in works with function.apply.
TEST(DebugStepFunctionApply) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  // Create a function for testing stepping.
  v8::Local<v8::Function> foo =
      CompileFunction(&env,
                      "function bar(x, y, z) { if (x == 1) { a = y; b = z; } }"
                      "function foo(){ debugger; bar.apply(this, [1,2,3]); }",
                      "foo");

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);

  v8::Local<v8::Context> context = env.local();
  run_step.set_step_action(StepIn);
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // With stepping all break locations are hit.
  CHECK_EQ(7, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();

  // Register a debug event listener which just counts.
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // Without stepping only the debugger statement is hit.
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}


// Test that step in works with function.call.
TEST(DebugStepFunctionCall) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping.
  v8::Local<v8::Function> foo = CompileFunction(
      &env,
      "function bar(x, y, z) { if (x == 1) { a = y; b = z; } }"
      "function foo(a){ debugger;"
      "                 if (a) {"
      "                   bar.call(this, 1, 2, 3);"
      "                 } else {"
      "                   bar.call(this, 0);"
      "                 }"
      "}",
      "foo");

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);
  run_step.set_step_action(StepIn);

  // Check stepping where the if condition in bar is false.
  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(6, break_point_hit_count);

  // Check stepping where the if condition in bar is true.
  break_point_hit_count = 0;
  const int argc = 1;
  v8::Local<v8::Value> argv[argc] = {v8::True(isolate)};
  foo->Call(context, env->Global(), argc, argv).ToLocalChecked();
  CHECK_EQ(8, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();

  // Register a debug event listener which just counts.
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // Without stepping only the debugger statement is hit.
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(isolate, nullptr);
  CheckDebuggerUnloaded();
}


// Test that step in works with Function.call.apply.
TEST(DebugStepFunctionCallApply) {
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping.
  v8::Local<v8::Function> foo =
      CompileFunction(&env,
                      "function bar() { }"
                      "function foo(){ debugger;"
                      "                Function.call.apply(bar);"
                      "                Function.call.apply(Function.call, "
                      "[Function.call, bar]);"
                      "}",
                      "foo");

  // Register a debug event listener which steps and counts.
  DebugEventCounter run_step;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &run_step);
  run_step.set_step_action(StepIn);

  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();
  CHECK_EQ(6, break_point_hit_count);

  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();

  // Register a debug event listener which just counts.
  DebugEventCounter delegate;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &delegate);

  break_point_hit_count = 0;
  foo->Call(context, env->Global(), 0, nullptr).ToLocalChecked();

  // Without stepping only the debugger statement is hit.
  CHECK_EQ(1, break_point_hit_count);

  v8::debug::SetDebugDelegate(isolate, nullptr);
  CheckDebuggerUnloaded();
}


// Tests that breakpoint will be hit if it's set in script.
TEST(PauseInScript) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(env->GetIsolate());

  // Register a debug event listener which counts.
  DebugEventCounter event_counter;
  v8::debug::SetDebugDelegate(env->GetIsolate(), &event_counter);

  v8::Local<v8::Context> context = env.local();
  // Create a script that returns a function.
  const char* src = "(function (evt) {})";
  const char* script_name = "StepInHandlerTest";

  v8::ScriptOrigin origin(v8_str(env->GetIsolate(), script_name),
                          v8::Integer::New(env->GetIsolate(), 0));
  v8::Local<v8::Script> script =
      v8::Script::Compile(context, v8_str(env->GetIsolate(), src), &origin)
          .ToLocalChecked();

  // Set breakpoint in the script.
  i::Handle<i::Script> i_script(
      i::Script::cast(v8::Utils::OpenHandle(*script)->shared().script()),
      isolate);
  i::Handle<i::String> condition = isolate->factory()->empty_string();
  int position = 0;
  int id;
  isolate->debug()->SetBreakPointForScript(i_script, condition, &position, &id);
  break_point_hit_count = 0;

  v8::Local<v8::Value> r = script->Run(context).ToLocalChecked();

  CHECK(r->IsFunction());
  CHECK_EQ(1, break_point_hit_count);

  // Get rid of the debug delegate.
  v8::debug::SetDebugDelegate(env->GetIsolate(), nullptr);
  CheckDebuggerUnloaded();
}

int message_callback_count = 0;

TEST(DebugBreak) {
  i::FLAG_stress_compaction = false;
#ifdef VERIFY_HEAP
  i::FLAG_verify_heap = true;
#endif
  LocalContext env;
  v8::Isolate* isolate = env->GetIsolate();
  v8::HandleScope scope(isolate);

  // Register a debug event listener which sets the break flag and counts.
  DebugEventBreak delegate;
  v8::debug::SetDebugDelegate(isolate, &delegate);

  v8::Local<v8::Context> context = env.local();
  // Create a function for testing stepping.
  const char* src = "function f0() {}"
                    "function f1(x1) {}"
                    "function f2(x1,x2) {}"
                    "function f3(x1,x2,x3) {}";
  v8::Local<v8::Function> f0 = CompileFunction(&env, src, "f0");
  v8::Local<v8::Function> f1 = CompileFunction(&env, src, "f1");
  v8::Local<v8::Function> f2 = CompileFunction(&env, src, "f2");
  v8::Local<v8::Function> f3 = CompileFunction(&env, src, "f3");

  // Call the function to make sure it is compiled.
  v8::Local