[turbofan] Replace uninitialized JSCall nodes with SOFT deopt.

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 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/bytecode-graph-builder.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/compiler-source-position-table.h"
@@ skipping 1356 matching lines @@
                 bytecode_iterator().current_bytecode()),
             receiver_mode);
   PrepareEagerCheckpoint();
 
   // Slot index of 0 is used indicate no feedback slot is available. Assert
   // the assumption that slot index 0 is never a valid feedback slot.
   STATIC_ASSERT(FeedbackVector::kReservedIndexCount > 0);
   VectorSlotPair feedback = CreateVectorSlotPair(slot_id);
 
   CallFrequency frequency = ComputeCallFrequency(slot_id);
-  const Operator* call = javascript()->Call(arg_count, frequency, feedback,
-                                            receiver_mode, tail_call_mode);
-  Node* value = ProcessCallArguments(call, args, static_cast<int>(arg_count));
-  environment()->BindAccumulator(value, Environment::kAttachFrameState);
+  const Operator* op = javascript()->Call(arg_count, frequency, feedback,
+                                          receiver_mode, tail_call_mode);
+  Node* node = nullptr;
+  if (Node* simplified = TryBuildSimplifiedCall(
+          op, args, static_cast<int>(arg_count), feedback.slot())) {
+    if (environment() == nullptr) return;
+    node = simplified;
+  } else {
+    node = ProcessCallArguments(op, args, static_cast<int>(arg_count));
+  }
+  environment()->BindAccumulator(node, Environment::kAttachFrameState);
 }
 
 void BytecodeGraphBuilder::BuildCallVarArgs(TailCallMode tail_call_mode,
                                             ConvertReceiverMode receiver_mode) {
   DCHECK_EQ(interpreter::Bytecodes::GetReceiverMode(
                 bytecode_iterator().current_bytecode()),
             receiver_mode);
   Node* callee =
       environment()->LookupRegister(bytecode_iterator().GetRegisterOperand(0));
   interpreter::Register first_reg = bytecode_iterator().GetRegisterOperand(1);
@@ skipping 1265 matching lines @@
   Reduction early_reduction =
       type_hint_lowering().ReduceToPrimitiveToStringOperation(value, effect,
                                                               control, slot);
   if (early_reduction.Changed()) {
     ApplyEarlyReduction(early_reduction);
     return early_reduction.replacement();
   }
   return nullptr;
 }
 
+Node* BytecodeGraphBuilder::TryBuildSimplifiedCall(const Operator* op,
+                                                   Node* const* args,
+                                                   int arg_count,
+                                                   FeedbackSlot slot) {
+  // TODO(mstarzinger,6112): This is a workaround for OSR loop entries being
+  // pruned from the graph by a soft-deopt. It can happen that a CallIC that
+  // control-dominates the OSR entry is still in "uninitialized" state.
+  if (!osr_ast_id_.IsNone()) return nullptr;
+  Node* effect = environment()->GetEffectDependency();
+  Node* control = environment()->GetControlDependency();
+  Reduction early_reduction = type_hint_lowering().ReduceCallOperation(
+      op, args, arg_count, effect, control, slot);
+  if (early_reduction.Changed()) {
+    ApplyEarlyReduction(early_reduction);
+    return early_reduction.replacement();
+  }
+  return nullptr;
+}
+
 Node* BytecodeGraphBuilder::TryBuildSimplifiedLoadNamed(const Operator* op,
                                                         Node* receiver,
                                                         FeedbackSlot slot) {
   // TODO(mstarzinger,6112): This is a workaround for OSR loop entries being
   // pruned from the graph by a soft-deopt. It can happen that a LoadIC that
   // control-dominates the OSR entry is still in "uninitialized" state.
   if (bytecode_analysis()->HasOSREntryPoint()) return nullptr;
   Node* effect = environment()->GetEffectDependency();
   Node* control = environment()->GetControlDependency();
   Reduction early_reduction = type_hint_lowering().ReduceLoadNamedOperation(
@@ skipping 273 matching lines @@
         it->source_position().ScriptOffset(), start_position_.InliningId()));
     it->Advance();
   } else {
     DCHECK_GT(it->code_offset(), offset);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8