[turbofan] Prepare mechanism to enable TF on language subset.

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-numbering.h"
 #include "src/bootstrapper.h"
@@ skipping 357 matching lines @@
       return SetLastStatus(FAILED);
     }
     if (FLAG_hydrogen_stats) {
       isolate()->GetHStatistics()->IncrementFullCodeGen(timer.Elapsed());
     }
   }
 
   DCHECK(info()->shared_info()->has_deoptimization_support());
 
   // Check the enabling conditions for TurboFan.
+  bool dont_crankshaft = info()->shared_info()->dont_crankshaft();
   if (((FLAG_turbo_asm && info()->shared_info()->asm_function()) ||
+       (dont_crankshaft && strcmp(FLAG_turbo_filter, "~~") == 0) ||
        info()->closure()->PassesFilter(FLAG_turbo_filter)) &&
       (FLAG_turbo_osr || !info()->is_osr())) {
     // Use TurboFan for the compilation.
     if (FLAG_trace_opt) {
       OFStream os(stdout);
       os << "[compiling method " << Brief(*info()->closure())
          << " using TurboFan";
       if (info()->is_osr()) os << " OSR";
       os << "]" << std::endl;
     }
 
     if (info()->shared_info()->asm_function()) {
       info()->MarkAsContextSpecializing();
     } else if (FLAG_turbo_type_feedback) {
       info()->MarkAsTypeFeedbackEnabled();
       info()->EnsureFeedbackVector();
     }
 
     Timer t(this, &time_taken_to_create_graph_);
     compiler::Pipeline pipeline(info());
     pipeline.GenerateCode();
     if (!info()->code().is_null()) {
       return SetLastStatus(SUCCEEDED);
     }
   }
 
-  if (!isolate()->use_crankshaft()) {
+  if (!isolate()->use_crankshaft() || dont_crankshaft) {
     // Crankshaft is entirely disabled.
     return SetLastStatus(FAILED);
   }
 
   Scope* scope = info()->scope();
   if (LUnallocated::TooManyParameters(scope->num_parameters())) {
     // Crankshaft would require too many Lithium operands.
     return AbortOptimization(kTooManyParameters);
   }
 
@@ skipping 315 matching lines @@
 static bool Renumber(ParseInfo* parse_info) {
   if (!AstNumbering::Renumber(parse_info->isolate(), parse_info->zone(),
                               parse_info->function())) {
     return false;
   }
   Handle<SharedFunctionInfo> shared_info = parse_info->shared_info();
   if (!shared_info.is_null()) {
     FunctionLiteral* lit = parse_info->function();
     shared_info->set_ast_node_count(lit->ast_node_count());
     MaybeDisableOptimization(shared_info, lit->dont_optimize_reason());
+    shared_info->set_dont_crankshaft(lit->flags()->Contains(kDontCrankshaft));
     shared_info->set_dont_cache(lit->flags()->Contains(kDontCache));
   }
   return true;
 }
 
 
 bool Compiler::Analyze(ParseInfo* info) {
   DCHECK(info->function() != NULL);
   if (!Rewriter::Rewrite(info)) return false;
   if (!Scope::Analyze(info)) return false;
@@ skipping 810 matching lines @@
 }
 
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate(), zone()).PrintProgram(function()));
 }
 #endif
 } }  // namespace v8::internal