[crankshaft] Support inlining of function calls in tail position (in ES6 sense).

src/crankshaft/lithium-codegen.cc

 // Copyright 2013 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/crankshaft/lithium-codegen.h"
 
 #include <sstream>
 
 #if V8_TARGET_ARCH_IA32
 #include "src/crankshaft/ia32/lithium-ia32.h"  // NOLINT
@@ skipping 222 matching lines @@
       translation->BeginConstructStubFrame(shared_id, translation_size);
       if (info()->closure().is_identical_to(environment->closure())) {
         translation->StoreJSFrameFunction();
       } else {
         int closure_id = DefineDeoptimizationLiteral(environment->closure());
         translation->StoreLiteral(closure_id);
       }
       break;
     }
     case JS_GETTER: {
-      DCHECK(translation_size == 1);
-      DCHECK(height == 0);
+      DCHECK_EQ(1, translation_size);
+      DCHECK_EQ(0, height);
       int shared_id = DefineDeoptimizationLiteral(
           environment->entry() ? environment->entry()->shared()
                                : info()->shared_info());
       translation->BeginGetterStubFrame(shared_id);
       if (info()->closure().is_identical_to(environment->closure())) {
         translation->StoreJSFrameFunction();
       } else {
         int closure_id = DefineDeoptimizationLiteral(environment->closure());
         translation->StoreLiteral(closure_id);
       }
       break;
     }
     case JS_SETTER: {
-      DCHECK(translation_size == 2);
-      DCHECK(height == 0);
+      DCHECK_EQ(2, translation_size);
+      DCHECK_EQ(0, height);
       int shared_id = DefineDeoptimizationLiteral(
           environment->entry() ? environment->entry()->shared()
                                : info()->shared_info());
       translation->BeginSetterStubFrame(shared_id);
       if (info()->closure().is_identical_to(environment->closure())) {
         translation->StoreJSFrameFunction();
       } else {
         int closure_id = DefineDeoptimizationLiteral(environment->closure());
         translation->StoreLiteral(closure_id);
       }
       break;
     }
+    case TAIL_CALLER_FUNCTION: {
+      DCHECK_EQ(0, translation_size);
+      int shared_id = DefineDeoptimizationLiteral(
+          environment->entry() ? environment->entry()->shared()
+                               : info()->shared_info());
+      translation->BeginTailCallerFrame(shared_id);
+      if (info()->closure().is_identical_to(environment->closure())) {
+        translation->StoreJSFrameFunction();
+      } else {
+        int closure_id = DefineDeoptimizationLiteral(environment->closure());
+        translation->StoreLiteral(closure_id);
+      }
+      break;
+    }
     case ARGUMENTS_ADAPTOR: {
       int shared_id = DefineDeoptimizationLiteral(
           environment->entry() ? environment->entry()->shared()
                                : info()->shared_info());
       translation->BeginArgumentsAdaptorFrame(shared_id, translation_size);
       if (info()->closure().is_identical_to(environment->closure())) {
         translation->StoreJSFrameFunction();
       } else {
         int closure_id = DefineDeoptimizationLiteral(environment->closure());
         translation->StoreLiteral(closure_id);
@@ skipping 72 matching lines @@
 Deoptimizer::DeoptInfo LCodeGenBase::MakeDeoptInfo(
     LInstruction* instr, Deoptimizer::DeoptReason deopt_reason) {
   Deoptimizer::DeoptInfo deopt_info(instr->hydrogen_value()->position(),
                                     instr->Mnemonic(), deopt_reason);
   HEnterInlined* enter_inlined = instr->environment()->entry();
   deopt_info.inlining_id = enter_inlined ? enter_inlined->inlining_id() : 0;
   return deopt_info;
 }
 }  // namespace internal
 }  // namespace v8