First version of the new generators implementation.

src/compiler.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/compiler.h"
 
 #include <algorithm>
 
 #include "src/ast/ast-numbering.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 297 matching lines @@
 // Implementation of OptimizedCompileJob
 
 OptimizedCompileJob::Status OptimizedCompileJob::CreateGraph() {
   DCHECK(info()->IsOptimizing());
 
   // Do not use Crankshaft/TurboFan if we need to be able to set break points.
   if (info()->shared_info()->HasDebugInfo()) {
     return AbortOptimization(kFunctionBeingDebugged);
   }
 
+  // Do not use Crankshaft/TurboFan on a generator function.
+  // TODO(neis): Eventually enable for Turbofan.
+  if (IsGeneratorFunction(info()->shared_info()->kind())) {
+    return AbortOptimization(kGenerator);
+  }
+
   // Limit the number of times we try to optimize functions.
   const int kMaxOptCount =
       FLAG_deopt_every_n_times == 0 ? FLAG_max_opt_count : 1000;
   if (info()->shared_info()->opt_count() > kMaxOptCount) {
     return AbortOptimization(kOptimizedTooManyTimes);
   }
 
   // Optimization requires a version of fullcode with deoptimization support.
   // Recompile the unoptimized version of the code if the current version
   // doesn't have deoptimization support already.
@@ skipping 215 matching lines @@
   if (!Compiler::Analyze(info->parse_info()) ||
       !(EnsureFeedbackVector(info), FullCodeGenerator::MakeCode(info))) {
     Isolate* isolate = info->isolate();
     if (!isolate->has_pending_exception()) isolate->StackOverflow();
     return false;
   }
   return true;
 }
 
 bool UseIgnition(CompilationInfo* info) {
-  // TODO(4681): Generator functions are not yet supported.
-  if (info->shared_info()->is_generator()) {
+  if (info->shared_info()->is_generator() && !FLAG_ignition_generators) {
     return false;
   }
 
   // Checks whether top level functions should be passed by the filter.
   if (info->shared_info()->is_toplevel()) {
     Vector<const char> filter = CStrVector(FLAG_ignition_filter);
     return (filter.length() == 0) || (filter.length() == 1 && filter[0] == '*');
   }
 
   // Finally respect the filter.
@@ skipping 1133 matching lines @@
     MaybeHandle<Code> code;
     if (cached.code != nullptr) code = handle(cached.code);
     Handle<Context> native_context(function->context()->native_context());
     SharedFunctionInfo::AddToOptimizedCodeMap(shared, native_context, code,
                                               literals, BailoutId::None());
   }
 }
 
 }  // namespace internal
 }  // namespace v8