[inspector] expose breakpoints for builtins and API functions.

R=jgruber@chromium.org, kozyatinskiy@chromium.org

Bug: v8:178
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Idee461c6ff6c8a14b01229ea6448e437f3db6dab
Reviewed-on: https://chromium-review.googlesource.com/973202
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52151}

src/api.cc

@@ -9448,8 +9448,8 @@ bool debug::Script::SetBreakpoint(v8::Local<v8::String> condition,
   i::Handle<i::Script> script = Utils::OpenHandle(this);
   i::Isolate* isolate = script->GetIsolate();
   int offset = GetSourceOffset(*location);
-  if (!isolate->debug()->SetBreakpoint(script, Utils::OpenHandle(*condition),
-                                       &offset, id)) {
+  if (!isolate->debug()->SetBreakPointForScript(
+          script, Utils::OpenHandle(*condition), &offset, id)) {
     return false;
   }
   *location = GetSourceLocation(offset);
@@ -9858,6 +9858,35 @@ int64_t debug::GetNextRandomInt64(v8::Isolate* v8_isolate) {
       ->NextInt64();
 }
 
+int debug::GetDebuggingId(v8::Local<v8::Function> function) {
+  i::JSReceiver* callable = *v8::Utils::OpenHandle(*function);
+  if (!callable->IsJSFunction()) return i::SharedFunctionInfo::kNoDebuggingId;
+  i::JSFunction* fun = i::JSFunction::cast(callable);
+  i::SharedFunctionInfo* shared = fun->shared();
+  int id = shared->debugging_id();
+  if (id == i::SharedFunctionInfo::kNoDebuggingId) {
+    id = shared->GetHeap()->NextDebuggingId();
+    shared->set_debugging_id(id);
+  }
+  DCHECK_NE(i::SharedFunctionInfo::kNoDebuggingId, id);
+  return id;
+}
+
+bool debug::SetFunctionBreakpoint(v8::Local<v8::Function> function,
+                                  v8::Local<v8::String> condition,
+                                  BreakpointId* id) {
+  i::Handle<i::JSReceiver> callable = Utils::OpenHandle(*function);
+  if (!callable->IsJSFunction()) return false;
+  i::Handle<i::JSFunction> jsfunction =
+      i::Handle<i::JSFunction>::cast(callable);
+  i::Isolate* isolate = jsfunction->GetIsolate();
+  i::Handle<i::String> condition_string =
+      condition.IsEmpty() ? isolate->factory()->empty_string()
+                          : Utils::OpenHandle(*condition);
+  return isolate->debug()->SetBreakpointForFunction(jsfunction,
+                                                    condition_string, id);
+}
+
 Local<String> CpuProfileNode::GetFunctionName() const {
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   i::Isolate* isolate = node->isolate();

src/debug/debug-interface.h

@@ -506,6 +506,11 @@ v8::MaybeLocal<v8::Value> EvaluateGlobal(v8::Isolate* isolate,
                                          v8::Local<v8::String> source,
                                          bool throw_on_side_effect);
 
+int GetDebuggingId(v8::Local<v8::Function> function);
+
+bool SetFunctionBreakpoint(v8::Local<v8::Function> function,
+                           v8::Local<v8::String> condition, BreakpointId* id);
+
 }  // namespace debug
 }  // namespace v8
 

src/debug/debug.cc

@@ -607,7 +607,7 @@ bool Debug::SetBreakPoint(Handle<JSFunction> function,
 
   // Make sure the function is compiled and has set up the debug info.
   Handle<SharedFunctionInfo> shared(function->shared());
-  if (!EnsureBreakInfo(shared)) return true;
+  if (!EnsureBreakInfo(shared)) return false;
   PrepareFunctionForBreakPoints(shared);
   Handle<DebugInfo> debug_info(shared->GetDebugInfo());
   // Source positions starts with zero.
@@ -627,8 +627,11 @@ bool Debug::SetBreakPoint(Handle<JSFunction> function,
 }
 
 bool Debug::SetBreakPointForScript(Handle<Script> script,
-                                   Handle<BreakPoint> break_point,
-                                   int* source_position) {
+                                   Handle<String> condition,
+                                   int* source_position, int* id) {
+  *id = ++thread_local_.last_breakpoint_id_;
+  Handle<BreakPoint> break_point =
+      isolate_->factory()->NewBreakPoint(*id, condition);
   if (script->type() == Script::TYPE_WASM) {
     Handle<WasmCompiledModule> compiled_module(
         WasmCompiledModule::cast(script->wasm_compiled_module()), isolate_);
@@ -741,12 +744,13 @@ void Debug::ClearBreakPoint(Handle<BreakPoint> break_point) {
   }
 }
 
-bool Debug::SetBreakpoint(Handle<Script> script, Handle<String> condition,
-                          int* offset, int* id) {
+bool Debug::SetBreakpointForFunction(Handle<JSFunction> function,
+                                     Handle<String> condition, int* id) {
   *id = ++thread_local_.last_breakpoint_id_;
   Handle<BreakPoint> breakpoint =
       isolate_->factory()->NewBreakPoint(*id, condition);
-  return SetBreakPointForScript(script, breakpoint, offset);
+  int source_position = 0;
+  return SetBreakPoint(function, breakpoint, &source_position);
 }
 
 void Debug::RemoveBreakpoint(int id) {

src/debug/debug.h

@@ -242,15 +242,14 @@ class Debug {
   // Break point handling.
   bool SetBreakPoint(Handle<JSFunction> function,
                      Handle<BreakPoint> break_point, int* source_position);
-  bool SetBreakPointForScript(Handle<Script> script,
-                              Handle<BreakPoint> break_point,
-                              int* source_position);
   void ClearBreakPoint(Handle<BreakPoint> break_point);
   void ChangeBreakOnException(ExceptionBreakType type, bool enable);
   bool IsBreakOnException(ExceptionBreakType type);
 
-  bool SetBreakpoint(Handle<Script> script, Handle<String> condition,
-                     int* offset, int* id);
+  bool SetBreakPointForScript(Handle<Script> script, Handle<String> condition,
+                              int* source_position, int* id);
+  bool SetBreakpointForFunction(Handle<JSFunction> function,
+                                Handle<String> condition, int* id);
   void RemoveBreakpoint(int id);
 
   // Find breakpoints from the debug info and the break location and check

src/factory.cc

@@ -2641,6 +2641,7 @@ Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
       FixedArrayOfWeakCells::Add(noscript_shared_function_infos(), share);
   isolate()->heap()->set_noscript_shared_function_infos(*new_noscript_list);
 
+  DCHECK_EQ(SharedFunctionInfo::kNoDebuggingId, share->debugging_id());
 #ifdef VERIFY_HEAP
   share->SharedFunctionInfoVerify();
 #endif

src/heap/heap-inl.h

@@ -668,15 +668,22 @@ uint32_t Heap::HashSeed() {
 
 int Heap::NextScriptId() {
   int last_id = last_script_id()->value();
-  if (last_id == Smi::kMaxValue) {
-    last_id = 1;
-  } else {
+  if (last_id == Smi::kMaxValue) last_id = v8::UnboundScript::kNoScriptId;
   last_id++;
-  }
   set_last_script_id(Smi::FromInt(last_id));
   return last_id;
 }
 
+int Heap::NextDebuggingId() {
+  int last_id = last_debugging_id()->value();
+  if (last_id == SharedFunctionInfo::DebuggingIdBits::kMax) {
+    last_id = SharedFunctionInfo::kNoDebuggingId;
+  }
+  last_id++;
+  set_last_debugging_id(Smi::FromInt(last_id));
+  return last_id;
+}
+
 int Heap::GetNextTemplateSerialNumber() {
   int next_serial_number = next_template_serial_number()->value() + 1;
   set_next_template_serial_number(Smi::FromInt(next_serial_number));

src/heap/heap.h

@@ -279,6 +279,7 @@ using v8::MemoryPressureLevel;
   V(Smi, stack_limit, StackLimit)                                              \
   V(Smi, real_stack_limit, RealStackLimit)                                     \
   V(Smi, last_script_id, LastScriptId)                                         \
+  V(Smi, last_debugging_id, LastDebuggingId)                                   \
   V(Smi, hash_seed, HashSeed)                                                  \
   /* To distinguish the function templates, so that we can find them in the */ \
   /* function cache of the native context. */                                  \
@@ -890,6 +891,7 @@ class Heap {
   inline uint32_t HashSeed();
 
   inline int NextScriptId();
+  inline int NextDebuggingId();
   inline int GetNextTemplateSerialNumber();
 
   void SetSerializedObjects(FixedArray* objects);

src/heap/setup-heap-internal.cc

@@ -606,6 +606,7 @@ void Heap::CreateInitialObjects() {
 
   // Handling of script id generation is in Heap::NextScriptId().
   set_last_script_id(Smi::FromInt(v8::UnboundScript::kNoScriptId));
+  set_last_debugging_id(Smi::FromInt(SharedFunctionInfo::kNoDebuggingId));
   set_next_template_serial_number(Smi::kZero);
 
   // Allocate the empty OrderedHashMap.

src/inspector/v8-console.cc

@@ -484,23 +484,15 @@ void V8Console::valuesCallback(const v8::FunctionCallbackInfo<v8::Value>& info,
 static void setFunctionBreakpoint(ConsoleHelper& helper, int sessionId,
                                   v8::Local<v8::Function> function,
                                   V8DebuggerAgentImpl::BreakpointSource source,
-                                  const String16& condition, bool enable) {
-  String16 scriptId = String16::fromInteger(function->ScriptId());
-  int lineNumber = function->GetScriptLineNumber();
-  int columnNumber = function->GetScriptColumnNumber();
-  if (lineNumber == v8::Function::kLineOffsetNotFound ||
-      columnNumber == v8::Function::kLineOffsetNotFound)
-    return;
-
-  if (V8InspectorSessionImpl* session = helper.session(sessionId)) {
+                                  v8::Local<v8::String> condition,
+                                  bool enable) {
+  V8InspectorSessionImpl* session = helper.session(sessionId);
+  if (session == nullptr) return;
   if (!session->debuggerAgent()->enabled()) return;
   if (enable) {
-      session->debuggerAgent()->setBreakpointAt(
-          scriptId, lineNumber, columnNumber, source, condition);
+    session->debuggerAgent()->setBreakpointFor(function, condition, source);
   } else {
-      session->debuggerAgent()->removeBreakpointAt(scriptId, lineNumber,
-                                                   columnNumber, source);
-    }
+    session->debuggerAgent()->removeBreakpointFor(function, source);
   }
 }
 
@@ -509,10 +501,14 @@ void V8Console::debugFunctionCallback(
   v8::debug::ConsoleCallArguments args(info);
   ConsoleHelper helper(args, v8::debug::ConsoleContext(), m_inspector);
   v8::Local<v8::Function> function;
+  v8::Local<v8::String> condition;
   if (!helper.firstArgAsFunction().ToLocal(&function)) return;
+  if (args.Length() > 1 && args[1]->IsString()) {
+    condition = args[1].As<v8::String>();
+  }
   setFunctionBreakpoint(helper, sessionId, function,
                         V8DebuggerAgentImpl::DebugCommandBreakpointSource,
-                        String16(), true);
+                        condition, true);
 }
 
 void V8Console::undebugFunctionCallback(
@@ -523,7 +519,7 @@ void V8Console::undebugFunctionCallback(
   if (!helper.firstArgAsFunction().ToLocal(&function)) return;
   setFunctionBreakpoint(helper, sessionId, function,
                         V8DebuggerAgentImpl::DebugCommandBreakpointSource,
-                        String16(), false);
+                        v8::Local<v8::String>(), false);
 }
 
 void V8Console::monitorFunctionCallback(
@@ -547,7 +543,8 @@ void V8Console::monitorFunctionCallback(
       "Array.prototype.join.call(arguments, \", \") : \"\")) && false");
   setFunctionBreakpoint(helper, sessionId, function,
                         V8DebuggerAgentImpl::MonitorCommandBreakpointSource,
-                        builder.toString(), true);
+                        toV8String(info.GetIsolate(), builder.toString()),
+                        true);
 }
 
 void V8Console::unmonitorFunctionCallback(
@@ -558,7 +555,7 @@ void V8Console::unmonitorFunctionCallback(
   if (!helper.firstArgAsFunction().ToLocal(&function)) return;
   setFunctionBreakpoint(helper, sessionId, function,
                         V8DebuggerAgentImpl::MonitorCommandBreakpointSource,
-                        String16(), false);
+                        v8::Local<v8::String>(), false);
 }
 
 void V8Console::lastEvaluationResultCallback(
@@ -711,7 +708,7 @@ v8::Local<v8::Object> V8Console::createCommandLineAPI(
   createBoundFunctionProperty(
       context, commandLineAPI, data, "debug",
       &V8Console::call<&V8Console::debugFunctionCallback>,
-      "function debug(function) { [Command Line API] }");
+      "function debug(function, condition) { [Command Line API] }");
   createBoundFunctionProperty(
       context, commandLineAPI, data, "undebug",
       &V8Console::call<&V8Console::undebugFunctionCallback>,

src/inspector/v8-debugger-agent-impl.cc

@@ -97,25 +97,38 @@ String16 generateBreakpointId(BreakpointType type,
   return builder.toString();
 }
 
+String16 generateBreakpointId(BreakpointType type,
+                              v8::Local<v8::Function> function) {
+  String16Builder builder;
+  builder.appendNumber(static_cast<int>(type));
+  builder.append(':');
+  builder.appendNumber(v8::debug::GetDebuggingId(function));
+  return builder.toString();
+}
+
 bool parseBreakpointId(const String16& breakpointId, BreakpointType* type,
                        String16* scriptSelector = nullptr,
                        int* lineNumber = nullptr, int* columnNumber = nullptr) {
   size_t typeLineSeparator = breakpointId.find(':');
   if (typeLineSeparator == String16::kNotFound) return false;
-  size_t lineColumnSeparator = breakpointId.find(':', typeLineSeparator + 1);
-  if (lineColumnSeparator == String16::kNotFound) return false;
-  size_t columnSelectorSeparator =
-      breakpointId.find(':', lineColumnSeparator + 1);
-  if (columnSelectorSeparator == String16::kNotFound) return false;
 
-  if (type) {
   int rawType = breakpointId.substring(0, typeLineSeparator).toInteger();
   if (rawType < static_cast<int>(BreakpointType::kByUrl) ||
       rawType > static_cast<int>(BreakpointType::kMonitorCommand)) {
     return false;
   }
-    *type = static_cast<BreakpointType>(rawType);
+  if (type) *type = static_cast<BreakpointType>(rawType);
+  if (rawType == static_cast<int>(BreakpointType::kDebugCommand) ||
+      rawType == static_cast<int>(BreakpointType::kMonitorCommand)) {
+    // The script and source position is not encoded in this case.
+    return true;
   }
+
+  size_t lineColumnSeparator = breakpointId.find(':', typeLineSeparator + 1);
+  if (lineColumnSeparator == String16::kNotFound) return false;
+  size_t columnSelectorSeparator =
+      breakpointId.find(':', lineColumnSeparator + 1);
+  if (columnSelectorSeparator == String16::kNotFound) return false;
   if (scriptSelector) {
     *scriptSelector = breakpointId.substring(columnSelectorSeparator + 1);
   }
@@ -822,6 +835,19 @@ V8DebuggerAgentImpl::setBreakpointImpl(const String16& breakpointId,
       .build();
 }
 
+void V8DebuggerAgentImpl::setBreakpointImpl(const String16& breakpointId,
+                                            v8::Local<v8::Function> function,
+                                            v8::Local<v8::String> condition) {
+  v8::debug::BreakpointId debuggerBreakpointId;
+  if (!v8::debug::SetFunctionBreakpoint(function, condition,
+                                        &debuggerBreakpointId)) {
+    return;
+  }
+  m_debuggerBreakpointIdToBreakpointId[debuggerBreakpointId] = breakpointId;
+  m_breakpointIdToDebuggerBreakpointIds[breakpointId].push_back(
+      debuggerBreakpointId);
+}
+
 Response V8DebuggerAgentImpl::searchInContent(
     const String16& scriptId, const String16& query,
     Maybe<bool> optionalCaseSensitive, Maybe<bool> optionalIsRegex,
@@ -1604,29 +1630,26 @@ void V8DebuggerAgentImpl::breakProgram(
   }
 }
 
-void V8DebuggerAgentImpl::setBreakpointAt(const String16& scriptId,
-                                          int lineNumber, int columnNumber,
-                                          BreakpointSource source,
-                                          const String16& condition) {
+void V8DebuggerAgentImpl::setBreakpointFor(v8::Local<v8::Function> function,
+                                           v8::Local<v8::String> condition,
+                                           BreakpointSource source) {
   String16 breakpointId = generateBreakpointId(
       source == DebugCommandBreakpointSource ? BreakpointType::kDebugCommand
                                              : BreakpointType::kMonitorCommand,
-      scriptId, lineNumber, columnNumber);
+      function);
   if (m_breakpointIdToDebuggerBreakpointIds.find(breakpointId) !=
       m_breakpointIdToDebuggerBreakpointIds.end()) {
     return;
   }
-  setBreakpointImpl(breakpointId, scriptId, condition, lineNumber,
-                    columnNumber);
+  setBreakpointImpl(breakpointId, function, condition);
 }
 
-void V8DebuggerAgentImpl::removeBreakpointAt(const String16& scriptId,
-                                             int lineNumber, int columnNumber,
+void V8DebuggerAgentImpl::removeBreakpointFor(v8::Local<v8::Function> function,
                                               BreakpointSource source) {
   String16 breakpointId = generateBreakpointId(
       source == DebugCommandBreakpointSource ? BreakpointType::kDebugCommand
                                              : BreakpointType::kMonitorCommand,
-      scriptId, lineNumber, columnNumber);
+      function);
   removeBreakpointImpl(breakpointId);
 }
 

src/inspector/v8-debugger-agent-impl.h

@@ -120,11 +120,11 @@ class V8DebuggerAgentImpl : public protocol::Debugger::Backend {
 
   bool enabled() const { return m_enabled; }
 
-  void setBreakpointAt(const String16& scriptId, int lineNumber,
-                       int columnNumber, BreakpointSource,
-                       const String16& condition = String16());
-  void removeBreakpointAt(const String16& scriptId, int lineNumber,
-                          int columnNumber, BreakpointSource);
+  void setBreakpointFor(v8::Local<v8::Function> function,
+                        v8::Local<v8::String> condition,
+                        BreakpointSource source);
+  void removeBreakpointFor(v8::Local<v8::Function> function,
+                           BreakpointSource source);
   void schedulePauseOnNextStatement(
       const String16& breakReason,
       std::unique_ptr<protocol::DictionaryValue> data);
@@ -164,6 +164,9 @@ class V8DebuggerAgentImpl : public protocol::Debugger::Backend {
   std::unique_ptr<protocol::Debugger::Location> setBreakpointImpl(
       const String16& breakpointId, const String16& scriptId,
       const String16& condition, int lineNumber, int columnNumber);
+  void setBreakpointImpl(const String16& breakpointId,
+                         v8::Local<v8::Function> function,
+                         v8::Local<v8::String> condition);
   void removeBreakpointImpl(const String16& breakpointId);
   void clearBreakDetails();
 

src/objects/shared-function-info-inl.h

@@ -209,6 +209,8 @@ BIT_FIELD_ACCESSORS(SharedFunctionInfo, debugger_hints,
 BIT_FIELD_ACCESSORS(SharedFunctionInfo, debugger_hints,
                     has_reported_binary_coverage,
                     SharedFunctionInfo::HasReportedBinaryCoverageBit)
+BIT_FIELD_ACCESSORS(SharedFunctionInfo, debugger_hints, debugging_id,
+                    SharedFunctionInfo::DebuggingIdBits)
 
 void SharedFunctionInfo::DontAdaptArguments() {
   DCHECK(code()->kind() == Code::BUILTIN || code()->kind() == Code::STUB);

src/objects/shared-function-info.h

@@ -246,6 +246,11 @@ class SharedFunctionInfo : public HeapObject {
   // Indicates that the function has been reported for binary code coverage.
   DECL_BOOLEAN_ACCESSORS(has_reported_binary_coverage)
 
+  // Id assigned to the function for debugging.
+  // This could also be implemented as a weak hash table.
+  inline int debugging_id() const;
+  inline void set_debugging_id(int value);
+
   // The function's name if it is non-empty, otherwise the inferred name.
   String* DebugName();
 
@@ -508,11 +513,14 @@ class SharedFunctionInfo : public HeapObject {
   V(ComputedHasNoSideEffectBit, bool, 1, _)    \
   V(DebugIsBlackboxedBit, bool, 1, _)          \
   V(ComputedDebugIsBlackboxedBit, bool, 1, _)  \
-  V(HasReportedBinaryCoverageBit, bool, 1, _)
+  V(HasReportedBinaryCoverageBit, bool, 1, _)  \
+  V(DebuggingIdBits, int, 20, _)
 
   DEFINE_BIT_FIELDS(DEBUGGER_HINTS_BIT_FIELDS)
 #undef DEBUGGER_HINTS_BIT_FIELDS
 
+  static const int kNoDebuggingId = 0;
+
   // Indicates that this function uses a super property (or an eval that may
   // use a super property).
   // This is needed to set up the [[HomeObject]] on the function instance.

test/cctest/test-debug.cc

@@ -3237,12 +3237,12 @@ TEST(PauseInScript) {
           .ToLocalChecked();
 
   // Set breakpoint in the script.
-  i::Handle<i::BreakPoint> break_point =
-      isolate->factory()->NewBreakPoint(0, isolate->factory()->empty_string());
-  int position = 0;
   i::Handle<i::Script> i_script(
       i::Script::cast(v8::Utils::OpenHandle(*script)->shared()->script()));
-  isolate->debug()->SetBreakPointForScript(i_script, break_point, &position);
+  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();

test/inspector/runtime/command-line-api-expected.txt

@@ -235,7 +235,7 @@ Running test: testDebug
     result : {
         result : {
             className : Function
-            description : function debug(function) { [Command Line API] }
+            description : function debug(function, condition) { [Command Line API] }
             objectId : <objectId>
             type : function
         }
@@ -255,13 +255,39 @@ Running test: testDebug
 foo (:0:16)
 (anonymous) (:0:0)
 [
-    [0] : 5:0:12:<scriptId>
+    [0] : 5:1
 ]
+debugCommand
 foo (:0:16)
 (anonymous) (:0:0)
 [
-    [0] : 5:0:12:<scriptId>
+    [0] : 5:1
 ]
+debugCommand
+toUpper (:0:31)
+(anonymous) (:0:0)
+[
+    [0] : 5:2
+]
+debugCommand
+callSetTimeout (:0:28)
+(anonymous) (:0:0)
+[
+    [0] : 5:3
+]
+debugCommand
+callSetTimeout (:0:28)
+(anonymous) (:0:0)
+[
+    [0] : 5:3
+]
+debugCommand
+fromCharCode (:0:40)
+(anonymous) (:0:0)
+[
+    [0] : 5:4
+]
+debugCommand
 
 Running test: testMonitor
 {
@@ -291,6 +317,7 @@ after first call
 store functions..
 function foo called
 after first call
+function fromCharCode called with arguments: 1, 2, 3
 
 Running test: testProfile
 {

test/inspector/runtime/command-line-api.js

@@ -81,6 +81,7 @@ InspectorTest.runAsyncTestSuite([
     let message = await Protocol.Debugger.oncePaused();
     session.logCallFrames(message.params.callFrames);
     InspectorTest.logMessage(message.params.hitBreakpoints);
+    InspectorTest.logMessage(message.params.reason);
     await Protocol.Debugger.resume();
     await Protocol.Runtime.evaluate({expression: 'undebug(foo)', includeCommandLineAPI: true});
     await Protocol.Runtime.evaluate({ expression: 'foo()'});
@@ -92,10 +93,59 @@ InspectorTest.runAsyncTestSuite([
     message = await Protocol.Debugger.oncePaused();
     session.logCallFrames(message.params.callFrames);
     InspectorTest.logMessage(message.params.hitBreakpoints);
+    InspectorTest.logMessage(message.params.reason);
     await Protocol.Debugger.resume();
     await Protocol.Runtime.evaluate({expression: 'this.undebug(foo)'});
     await Protocol.Runtime.evaluate({expression: 'foo()'});
 
+    // Test builtin.
+    await Protocol.Runtime.evaluate({expression: 'function toUpper(x) { return x.toUpperCase() }'});
+    await Protocol.Runtime.evaluate({expression: 'debug(String.prototype.toUpperCase)', includeCommandLineAPI: true});
+    Protocol.Runtime.evaluate({ expression: 'toUpper("first call")'});
+    message = await Protocol.Debugger.oncePaused();
+    session.logCallFrames(message.params.callFrames);
+    InspectorTest.logMessage(message.params.hitBreakpoints);
+    InspectorTest.logMessage(message.params.reason);
+    await Protocol.Debugger.resume();
+    await Protocol.Runtime.evaluate({expression: 'undebug(String.prototype.toUpperCase)', includeCommandLineAPI: true});
+    await Protocol.Runtime.evaluate({ expression: 'toUpper("second call")'});
+
+    // Test API callback.
+    await Protocol.Runtime.evaluate({expression: 'function callSetTimeout() { setTimeout(function(){}, 0) }'});
+    await Protocol.Runtime.evaluate({expression: 'debug(setTimeout)', includeCommandLineAPI: true});
+    Protocol.Runtime.evaluate({ expression: 'callSetTimeout()'});
+    message = await Protocol.Debugger.oncePaused();
+    session.logCallFrames(message.params.callFrames);
+    InspectorTest.logMessage(message.params.hitBreakpoints);
+    InspectorTest.logMessage(message.params.reason);
+    let breakpointId = message.params.hitBreakpoints[0];
+    await Protocol.Debugger.resume();
+    await Protocol.Runtime.evaluate({expression: 'undebug(setTimeout)', includeCommandLineAPI: true});
+    await Protocol.Runtime.evaluate({ expression: 'callSetTimeout()'});
+
+    // Test remove break via protocol.
+    await Protocol.Runtime.evaluate({expression: 'function callSetTimeout() { setTimeout(function(){}, 0) }'});
+    await Protocol.Runtime.evaluate({expression: 'debug(setTimeout)', includeCommandLineAPI: true});
+    Protocol.Runtime.evaluate({ expression: 'callSetTimeout()'});
+    message = await Protocol.Debugger.oncePaused();
+    session.logCallFrames(message.params.callFrames);
+    InspectorTest.logMessage(message.params.hitBreakpoints);
+    InspectorTest.logMessage(message.params.reason);
+    await Protocol.Debugger.resume();
+    await Protocol.Debugger.removeBreakpoint({breakpointId});
+    await Protocol.Runtime.evaluate({ expression: 'callSetTimeout()'});
+
+    // Test condition.
+    await Protocol.Runtime.evaluate({expression: 'function fromCharCode(...args) { String.fromCharCode(...args) }'});
+    await Protocol.Runtime.evaluate({expression: 'debug(String.fromCharCode, "arguments.length == 3")'});
+    Protocol.Runtime.evaluate({ expression: 'fromCharCode("1", "2", "3")'});
+    message = await Protocol.Debugger.oncePaused();
+    session.logCallFrames(message.params.callFrames);
+    InspectorTest.logMessage(message.params.hitBreakpoints);
+    InspectorTest.logMessage(message.params.reason);
+    await Protocol.Runtime.evaluate({expression: 'undebug(String.fromCharCode)'});
+    await Protocol.Runtime.evaluate({ expression: 'fromCharCode()'});
+
     await Protocol.Debugger.disable();
   },
 
@@ -119,6 +169,13 @@ InspectorTest.runAsyncTestSuite([
     await Protocol.Runtime.evaluate({expression: 'this.unmonitor(foo)'});
     await Protocol.Runtime.evaluate({ expression: 'foo()'});
 
+    // Test builtin.
+    await Protocol.Runtime.evaluate({expression: 'function fromCharCode(...args) { String.fromCharCode(...args) }'});
+    await Protocol.Runtime.evaluate({expression: 'monitor(String.fromCharCode)'});
+    Protocol.Runtime.evaluate({ expression: 'fromCharCode("1", "2", "3")'});
+    await Protocol.Runtime.evaluate({expression: 'unmonitor(String.fromCharCode)'});
+    await Protocol.Runtime.evaluate({ expression: 'fromCharCode()'});
+
     Protocol.Runtime.onConsoleAPICalled(null);
     await Protocol.Debugger.disable();
     await Protocol.Runtime.disable();