deps: cherry-pick backports to V8

Included
  acb6779
  4e028bd
  75fe773
  c22bcd3
  49dec1a

Not included (cannot be applied cleanly)
  31450fc
  2b8a06b

PR-URL: #3351
Reviewed-By: indutny - Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>

deps/v8/include/v8.h

@@ -5370,6 +5370,19 @@ class V8_EXPORT Isolate {
    */
   static Isolate* GetCurrent();
 
+  /**
+   * Custom callback used by embedders to help V8 determine if it should abort
+   * when it throws and no internal handler is predicted to catch the
+   * exception. If --abort-on-uncaught-exception is used on the command line,
+   * then V8 will abort if either:
+   * - no custom callback is set.
+   * - the custom callback set returns true.
+   * Otherwise, the custom callback will not be called and V8 will not abort.
+   */
+  typedef bool (*AbortOnUncaughtExceptionCallback)(Isolate*);
+  void SetAbortOnUncaughtExceptionCallback(
+      AbortOnUncaughtExceptionCallback callback);
+
   /**
    * Methods below this point require holding a lock (using Locker) in
    * a multi-threaded environment.

deps/v8/src/accessors.cc

@@ -99,22 +99,37 @@ bool Accessors::IsJSArrayBufferViewFieldAccessor(Handle<Map> map,
   Isolate* isolate = name->GetIsolate();
 
   switch (map->instance_type()) {
-    case JS_TYPED_ARRAY_TYPE:
-      // %TypedArray%.prototype is non-configurable, and so are the following
-      // named properties on %TypedArray%.prototype, so we can directly inline
-      // the field-load for typed array maps that still use their
-      // %TypedArray%.prototype.
-      if (JSFunction::cast(map->GetConstructor())->prototype() !=
-          map->prototype()) {
+    case JS_TYPED_ARRAY_TYPE: {
+      if (!CheckForName(name, isolate->factory()->length_string(),
+                        JSTypedArray::kLengthOffset, object_offset) &&
+          !CheckForName(name, isolate->factory()->byte_length_string(),
+                        JSTypedArray::kByteLengthOffset, object_offset) &&
+          !CheckForName(name, isolate->factory()->byte_offset_string(),
+                        JSTypedArray::kByteOffsetOffset, object_offset)) {
         return false;
       }
-      return CheckForName(name, isolate->factory()->length_string(),
-                          JSTypedArray::kLengthOffset, object_offset) ||
-             CheckForName(name, isolate->factory()->byte_length_string(),
-                          JSTypedArray::kByteLengthOffset, object_offset) ||
-             CheckForName(name, isolate->factory()->byte_offset_string(),
-                          JSTypedArray::kByteOffsetOffset, object_offset);
 
+      if (map->is_dictionary_map()) return false;
+
+      // Check if the property is overridden on the instance.
+      DescriptorArray* descriptors = map->instance_descriptors();
+      int descriptor = descriptors->SearchWithCache(*name, *map);
+      if (descriptor != DescriptorArray::kNotFound) return false;
+
+      Handle<Object> proto = Handle<Object>(map->prototype(), isolate);
+      if (!proto->IsJSReceiver()) return false;
+
+      // Check if the property is defined in the prototype chain.
+      LookupIterator it(proto, name);
+      if (!it.IsFound()) return false;
+
+      Object* original_proto =
+          JSFunction::cast(map->GetConstructor())->prototype();
+
+      // Property is not configurable. It is enough to verify that
+      // the holder is the same.
+      return *it.GetHolder<Object>() == original_proto;
+    }
     case JS_DATA_VIEW_TYPE:
       return CheckForName(name, isolate->factory()->byte_length_string(),
                           JSDataView::kByteLengthOffset, object_offset) ||

deps/v8/src/api.cc

@@ -7160,6 +7160,13 @@ void Isolate::Exit() {
 }
 
 
+void Isolate::SetAbortOnUncaughtExceptionCallback(
+    AbortOnUncaughtExceptionCallback callback) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->SetAbortOnUncaughtExceptionCallback(callback);
+}
+
+
 Isolate::DisallowJavascriptExecutionScope::DisallowJavascriptExecutionScope(
     Isolate* isolate,
     Isolate::DisallowJavascriptExecutionScope::OnFailure on_failure)

deps/v8/src/isolate.cc

@@ -1013,13 +1013,21 @@ Object* Isolate::Throw(Object* exception, MessageLocation* location) {
       Handle<Object> message_obj = CreateMessage(exception_handle, location);
       thread_local_top()->pending_message_obj_ = *message_obj;
 
-      // If the abort-on-uncaught-exception flag is specified, abort on any
-      // exception not caught by JavaScript, even when an external handler is
-      // present.  This flag is intended for use by JavaScript developers, so
-      // print a user-friendly stack trace (not an internal one).
+      // For any exception not caught by JavaScript, even when an external
+      // handler is present:
+      // If the abort-on-uncaught-exception flag is specified, and if the
+      // embedder didn't specify a custom uncaught exception callback,
+      // or if the custom callback determined that V8 should abort, then
+      // abort.
       if (FLAG_abort_on_uncaught_exception &&
-          PredictExceptionCatcher() != CAUGHT_BY_JAVASCRIPT) {
-        FLAG_abort_on_uncaught_exception = false;  // Prevent endless recursion.
+          PredictExceptionCatcher() != CAUGHT_BY_JAVASCRIPT &&
+          (!abort_on_uncaught_exception_callback_ ||
+           abort_on_uncaught_exception_callback_(
+               reinterpret_cast<v8::Isolate*>(this)))) {
+        // Prevent endless recursion.
+        FLAG_abort_on_uncaught_exception = false;
+        // This flag is intended for use by JavaScript developers, so
+        // print a user-friendly stack trace (not an internal one).
         PrintF(stderr, "%s\n\nFROM\n",
                MessageHandler::GetLocalizedMessage(this, message_obj).get());
         PrintCurrentStackTrace(stderr);
@@ -1607,6 +1615,12 @@ void Isolate::SetCaptureStackTraceForUncaughtExceptions(
 }
 
 
+void Isolate::SetAbortOnUncaughtExceptionCallback(
+    v8::Isolate::AbortOnUncaughtExceptionCallback callback) {
+  abort_on_uncaught_exception_callback_ = callback;
+}
+
+
 Handle<Context> Isolate::native_context() {
   return handle(context()->native_context());
 }
@@ -1774,7 +1788,8 @@ Isolate::Isolate(bool enable_serializer)
       next_unique_sfi_id_(0),
 #endif
       use_counter_callback_(NULL),
-      basic_block_profiler_(NULL) {
+      basic_block_profiler_(NULL),
+      abort_on_uncaught_exception_callback_(NULL) {
   {
     base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer());
     CHECK(thread_data_table_);

deps/v8/src/isolate.h

@@ -698,6 +698,9 @@ class Isolate {
       int frame_limit,
       StackTrace::StackTraceOptions options);
 
+  void SetAbortOnUncaughtExceptionCallback(
+      v8::Isolate::AbortOnUncaughtExceptionCallback callback);
+
   enum PrintStackMode { kPrintStackConcise, kPrintStackVerbose };
   void PrintCurrentStackTrace(FILE* out);
   void PrintStack(StringStream* accumulator,
@@ -1366,6 +1369,9 @@ class Isolate {
 
   std::set<Cancelable*> cancelable_tasks_;
 
+  v8::Isolate::AbortOnUncaughtExceptionCallback
+      abort_on_uncaught_exception_callback_;
+
   friend class ExecutionAccess;
   friend class HandleScopeImplementer;
   friend class OptimizingCompileDispatcher;

deps/v8/src/objects.h

@@ -3932,14 +3932,14 @@ class ScopeInfo : public FixedArray {
   FOR_EACH_SCOPE_INFO_NUMERIC_FIELD(FIELD_ACCESSORS)
 #undef FIELD_ACCESSORS
 
- private:
   enum {
 #define DECL_INDEX(name) k##name,
     FOR_EACH_SCOPE_INFO_NUMERIC_FIELD(DECL_INDEX)
 #undef DECL_INDEX
     kVariablePartIndex
   };
 
+ private:
   // The layout of the variable part of a ScopeInfo is as follows:
   // 1. ParameterEntries:
   //    This part stores the names of the parameters for function scopes. One

deps/v8/test/cctest/test-api.cc

@@ -21826,4 +21826,34 @@ TEST(EstimatedContextSize) {
   v8::HandleScope scope(isolate);
   LocalContext env;
   CHECK(50000 < env->EstimatedSize());
+
+
+static int nb_uncaught_exception_callback_calls = 0;
+
+
+bool NoAbortOnUncaughtException(v8::Isolate* isolate) {
+  ++nb_uncaught_exception_callback_calls;
+  return false;
+}
+
+
+TEST(AbortOnUncaughtExceptionNoAbort) {
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope handle_scope(isolate);
+  v8::Handle<v8::ObjectTemplate> global_template =
+      v8::ObjectTemplate::New(isolate);
+  LocalContext env(NULL, global_template);
+
+  i::FLAG_abort_on_uncaught_exception = true;
+  isolate->SetAbortOnUncaughtExceptionCallback(NoAbortOnUncaughtException);
+
+  CompileRun("function boom() { throw new Error(\"boom\") }");
+
+  v8::Local<v8::Object> global_object = env->Global();
+  v8::Local<v8::Function> foo =
+      v8::Local<v8::Function>::Cast(global_object->Get(v8_str("boom")));
+
+  foo->Call(global_object, 0, NULL);
+
+  CHECK_EQ(1, nb_uncaught_exception_callback_calls);
 }

deps/v8/test/mjsunit/regress/regress-typedarray-length.js

@@ -71,6 +71,43 @@ assertEquals(undefined, get(a));
   assertEquals(undefined, get(a));
 })();
 
+(function() {
+  "use strict";
+
+  class MyTypedArray extends Int32Array {
+    constructor(length) {
+      super(length);
+    }
+  }
+
+  a = new MyTypedArray(1024);
+
+  get = function(a) {
+    return a.length;
+  }
+
+  assertEquals(1024, get(a));
+  assertEquals(1024, get(a));
+  assertEquals(1024, get(a));
+  %OptimizeFunctionOnNextCall(get);
+  assertEquals(1024, get(a));
+})();
+
+(function() {
+  "use strict";
+  var a = new Uint8Array(4);
+  Object.defineProperty(a, "length", {get: function() { return "blah"; }});
+  get = function(a) {
+    return a.length;
+  }
+
+  assertEquals("blah", get(a));
+  assertEquals("blah", get(a));
+  assertEquals("blah", get(a));
+  %OptimizeFunctionOnNextCall(get);
+  assertEquals("blah", get(a));
+})();
+
 // Ensure we cannot delete length, byteOffset, byteLength.
 assertTrue(Int32Array.prototype.hasOwnProperty("length"));
 assertTrue(Int32Array.prototype.hasOwnProperty("byteOffset"));

deps/v8/tools/gen-postmortem-metadata.py

@@ -132,6 +132,15 @@
         'value': 'JavaScriptFrameConstants::kFunctionOffset' },
     { 'name': 'off_fp_args',
         'value': 'JavaScriptFrameConstants::kLastParameterOffset' },
+
+    { 'name': 'scopeinfo_idx_nparams',
+        'value': 'ScopeInfo::kParameterCount' },
+    { 'name': 'scopeinfo_idx_nstacklocals',
+        'value': 'ScopeInfo::kStackLocalCount' },
+    { 'name': 'scopeinfo_idx_ncontextlocals',
+        'value': 'ScopeInfo::kContextLocalCount' },
+    { 'name': 'scopeinfo_idx_first_vars',
+        'value': 'ScopeInfo::kVariablePartIndex' },
 ];
 
 #
@@ -141,12 +150,13 @@
     'HeapObject, map, Map, kMapOffset',
     'JSObject, elements, Object, kElementsOffset',
     'FixedArray, data, uintptr_t, kHeaderSize',
+    'JSTypedArray, length, Object, kLengthOffset',
     'Map, instance_attributes, int, kInstanceAttributesOffset',
     'Map, inobject_properties_of_constructor_function_index_offset, int, kInObjectPropertiesOrConstructorFunctionIndexOffset',
     'Map, instance_size, int, kInstanceSizeOffset',
     'Map, bit_field, char, kBitFieldOffset',
     'Map, bit_field2, char, kBitField2Offset',
-    'Map, bit_field3, SMI, kBitField3Offset',
+    'Map, bit_field3, int, kBitField3Offset',
     'Map, prototype, Object, kPrototypeOffset',
     'NameDictionaryShape, prefix_size, int, kPrefixSize',
     'NameDictionaryShape, entry_size, int, kEntrySize',