[turbofan] Add new JSFrameSpecialization reducer.

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 376 matching lines @@
     // 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()) {
+      if (info()->osr_frame()) info()->MarkAsFrameSpecializing();
       info()->MarkAsContextSpecializing();
     } else if (FLAG_turbo_type_feedback) {
       info()->MarkAsTypeFeedbackEnabled();
       info()->EnsureFeedbackVector();
     }
     if (!info()->shared_info()->asm_function() ||
         FLAG_turbo_asm_deoptimization) {
       info()->MarkAsDeoptimizationEnabled();
     }
 
@@ skipping 298 matching lines @@
   }
   return MaybeHandle<Code>();
 }
 
 
 static void InsertCodeIntoOptimizedCodeMap(CompilationInfo* info) {
   Handle<Code> code = info->code();
   if (code->kind() != Code::OPTIMIZED_FUNCTION) return;  // Nothing to do.
 
   // Context specialization folds-in the context, so no sharing can occur.
-  if (code->is_turbofanned() && info->is_context_specializing()) return;
+  if (info->is_context_specializing()) return;
+  // Frame specialization implies context specialization.
+  DCHECK(!info->is_frame_specializing());
 
   // Do not cache bound functions.
   Handle<JSFunction> function = info->closure();
   if (function->shared()->bound()) return;
 
   // Cache optimized context-specific code.
   if (FLAG_cache_optimized_code) {
     Handle<SharedFunctionInfo> shared(function->shared());
     Handle<FixedArray> literals(function->literals());
     Handle<Context> native_context(function->context()->native_context());
@@ skipping 736 matching lines @@
     existing->set_scope_info(*scope_info);
     existing->set_feedback_vector(*info.feedback_vector());
   }
   return existing;
 }
 
 
 MaybeHandle<Code> Compiler::GetOptimizedCode(Handle<JSFunction> function,
                                              Handle<Code> current_code,
                                              ConcurrencyMode mode,
-                                             BailoutId osr_ast_id) {
+                                             BailoutId osr_ast_id,
+                                             JavaScriptFrame* osr_frame) {
   Handle<Code> cached_code;
   if (GetCodeFromOptimizedCodeMap(
           function, osr_ast_id).ToHandle(&cached_code)) {
     if (FLAG_trace_opt) {
       PrintF("[found optimized code for ");
       function->ShortPrint();
       if (!osr_ast_id.IsNone()) {
         PrintF(" at OSR AST id %d", osr_ast_id.ToInt());
       }
       PrintF("]\n");
@@ skipping 37 matching lines @@
   PostponeInterruptsScope postpone(isolate);
 
   info->SetOptimizing(osr_ast_id, current_code);
 
   if (mode == CONCURRENT) {
     if (GetOptimizedCodeLater(info.get())) {
       info.Detach();  // The background recompile job owns this now.
       return isolate->builtins()->InOptimizationQueue();
     }
   } else {
+    info->set_osr_frame(osr_frame);
     if (GetOptimizedCodeNow(info.get())) return info->code();
   }
 
   if (isolate->has_pending_exception()) isolate->clear_pending_exception();
   return MaybeHandle<Code>();
 }
 
 
 Handle<Code> Compiler::GetConcurrentlyOptimizedCode(OptimizedCompileJob* job) {
   // Take ownership of compilation info.  Deleting compilation info
@@ skipping 86 matching lines @@
 
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate(), zone()).PrintProgram(function()));
 }
 #endif
 }  // namespace internal
 }  // namespace v8