Implement new Function.prototype.toString and fix CreateDynamicFunction parsing

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 2256 matching lines @@
 
 
 MaybeLocal<Function> ScriptCompiler::CompileFunctionInContext(
     Local<Context> v8_context, Source* source, size_t arguments_count,
     Local<String> arguments[], size_t context_extension_count,
     Local<Object> context_extensions[]) {
   PREPARE_FOR_EXECUTION(v8_context, ScriptCompiler, CompileFunctionInContext,
                         Function);
   TRACE_EVENT0("v8", "V8.ScriptCompiler");
   i::Handle<i::String> source_string;
+  int parameters_end_pos = i::kNoSourcePosition;
   auto factory = isolate->factory();
   if (arguments_count) {
-    source_string = factory->NewStringFromStaticChars("(function(");
+    if (i::FLAG_harmony_function_tostring) {
+      source_string = factory->NewStringFromStaticChars("(function anonymous(");
+    } else {
+      source_string = factory->NewStringFromStaticChars("(function(");
+    }
     for (size_t i = 0; i < arguments_count; ++i) {
       IsIdentifierHelper helper;
       if (!helper.Check(*Utils::OpenHandle(*arguments[i]))) {
         return Local<Function>();
       }
       has_pending_exception =
           !factory->NewConsString(source_string,
                                   Utils::OpenHandle(*arguments[i]))
                .ToHandle(&source_string);
       RETURN_ON_FAILED_EXECUTION(Function);
       if (i + 1 == arguments_count) continue;
       has_pending_exception =
           !factory->NewConsString(source_string,
                                   factory->LookupSingleCharacterStringFromCode(
                                       ',')).ToHandle(&source_string);
       RETURN_ON_FAILED_EXECUTION(Function);
     }
-    auto brackets = factory->NewStringFromStaticChars("){");
+    i::Handle<i::String> brackets;
+    if (i::FLAG_harmony_function_tostring) {
+      brackets = factory->NewStringFromStaticChars("\n) {");
+      parameters_end_pos = source_string->length() - 3;
+    } else {
+      brackets = factory->NewStringFromStaticChars("){");
+    }
     has_pending_exception = !factory->NewConsString(source_string, brackets)
                                  .ToHandle(&source_string);
     RETURN_ON_FAILED_EXECUTION(Function);
   } else {
-    source_string = factory->NewStringFromStaticChars("(function(){");
+    if (i::FLAG_harmony_function_tostring) {
+      source_string =
+          factory->NewStringFromStaticChars("(function anonymous(\n) {");
+      parameters_end_pos = source_string->length() - 3;
+    } else {
+      source_string = factory->NewStringFromStaticChars("(function(){");
+    }
   }
 
   int scope_position = source_string->length();
   has_pending_exception =
       !factory->NewConsString(source_string,
                               Utils::OpenHandle(*source->source_string))
            .ToHandle(&source_string);
   RETURN_ON_FAILED_EXECUTION(Function);
   // Include \n in case the source contains a line end comment.
   auto brackets = factory->NewStringFromStaticChars("\n})");
@@ skipping 29 matching lines @@
   if (!source->resource_line_offset.IsEmpty()) {
     line_offset = static_cast<int>(source->resource_line_offset->Value());
   }
   if (!source->resource_column_offset.IsEmpty()) {
     column_offset = static_cast<int>(source->resource_column_offset->Value());
   }
   i::Handle<i::JSFunction> fun;
   has_pending_exception =
       !i::Compiler::GetFunctionFromEval(
            source_string, outer_info, context, i::SLOPPY,
-           i::ONLY_SINGLE_FUNCTION_LITERAL, eval_scope_position, eval_position,
-           line_offset, column_offset - scope_position, name_obj,
-           source->resource_options)
+           i::ONLY_SINGLE_FUNCTION_LITERAL, parameters_end_pos,
+           eval_scope_position, eval_position, line_offset,
+           column_offset - scope_position, name_obj, source->resource_options)
            .ToHandle(&fun);
   if (has_pending_exception) {
     isolate->ReportPendingMessages();
   }
   RETURN_ON_FAILED_EXECUTION(Function);
 
   i::Handle<i::Object> result;
   has_pending_exception =
       !i::Execution::Call(isolate, fun,
                           Utils::OpenHandle(*v8_context->Global()), 0,
@@ skipping 7798 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8