[turbofan] Move context specialization into JSContextSpecializer.

src/compiler/js-inlining.cc

 // Copyright 2014 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/js-inlining.h"
 
 #include "src/ast.h"
 #include "src/ast-numbering.h"
 #include "src/compiler/all-nodes.h"
 #include "src/compiler/ast-graph-builder.h"
@@ skipping 97 matching lines @@
  private:
   Operator const sentinel_op_;
   Node* const sentinel_;
   NodeVector copies_;
   Graph* const source_graph_;
   Graph* const target_graph_;
   Zone* const temp_zone_;
 };
 
 
-Reduction JSInliner::InlineCall(Node* call, Node* frame_state, Node* start,
-                                Node* end) {
+Reduction JSInliner::InlineCall(Node* call, Node* context, Node* frame_state,
+                                Node* start, Node* end) {
   // The scheduler is smart enough to place our code; we just ensure {control}
   // becomes the control input of the start of the inlinee, and {effect} becomes
   // the effect input of the start of the inlinee.
   Node* control = NodeProperties::GetControlInput(call);
   Node* effect = NodeProperties::GetEffectInput(call);
 
   // Context is last argument.
   int const inlinee_context_index =
       static_cast<int>(start->op()->ValueOutputCount()) - 1;
 
   // {inliner_inputs} counts JSFunction, Receiver, arguments, but not
   // context, effect, control.
   int inliner_inputs = call->op()->ValueInputCount();
   // Iterate over all uses of the start node.
   for (Edge edge : start->use_edges()) {
     Node* use = edge.from();
     switch (use->opcode()) {
       case IrOpcode::kParameter: {
         int index = 1 + ParameterIndexOf(use->op());
         if (index < inliner_inputs && index < inlinee_context_index) {
           // There is an input from the call, and the index is a value
           // projection but not the context, so rewire the input.
-          ReplaceWithValue(use, call->InputAt(index));
+          Replace(use, call->InputAt(index));
         } else if (index == inlinee_context_index) {
-          // TODO(turbofan): We always context specialize inlinees currently, so
-          // we should never get here.
-          UNREACHABLE();
+          Replace(use, context);
         } else if (index < inlinee_context_index) {
           // Call has fewer arguments than required, fill with undefined.
-          ReplaceWithValue(use, jsgraph_->UndefinedConstant());
+          Replace(use, jsgraph_->UndefinedConstant());
         } else {
           // We got too many arguments, discard for now.
           // TODO(sigurds): Fix to treat arguments array correctly.
         }
         break;
       }
       default:
         if (NodeProperties::IsEffectEdge(edge)) {
           edge.UpdateTo(effect);
         } else if (NodeProperties::IsControlEdge(edge)) {
@@ skipping 140 matching lines @@
     return NoChange();
   }
 
   TRACE("Inlining %s into %s\n",
         function->shared()->DebugName()->ToCString().get(),
         info_->shared_info()->DebugName()->ToCString().get());
 
   Graph graph(info.zone());
   JSGraph jsgraph(info.isolate(), &graph, jsgraph_->common(),
                   jsgraph_->javascript(), jsgraph_->machine());
+  AstGraphBuilder graph_builder(local_zone_, &info, &jsgraph);
+  graph_builder.CreateGraph(false);
 
   // The inlinee specializes to the context from the JSFunction object.
   // TODO(turbofan): We might want to load the context from the JSFunction at
   // runtime in case we only know the SharedFunctionInfo once we have dynamic
   // type feedback in the compiler.
-  AstGraphBuilder graph_builder(local_zone_, &info, &jsgraph);
-  graph_builder.CreateGraph(true, false);
+  Node* context = jsgraph_->Constant(handle(function->context()));
 
   CopyVisitor visitor(&graph, jsgraph_->graph(), info.zone());
   visitor.CopyGraph();
 
   Node* start = visitor.GetCopy(graph.start());
   Node* end = visitor.GetCopy(graph.end());
 
   Node* frame_state = call.frame_state();
   size_t const inlinee_formal_parameters = start->op()->ValueOutputCount() - 3;
   // Insert argument adaptor frame if required.
   if (call.formal_arguments() != inlinee_formal_parameters) {
     // In strong mode, in case of too few arguments we need to throw a
     // TypeError so we must not inline this call.
     if (is_strong(info.language_mode()) &&
         call.formal_arguments() < inlinee_formal_parameters) {
       return NoChange();
     }
     frame_state = CreateArgumentsAdaptorFrameState(&call, info.shared_info(),
                                                    info.zone());
   }
 
   // Remember that we inlined this function.
   info_->AddInlinedFunction(info.shared_info());
 
-  return InlineCall(node, frame_state, start, end);
+  return InlineCall(node, context, frame_state, start, end);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8