[turbofan] Initial support for Switch.

src/compiler/raw-machine-assembler.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/code-factory.h"
 #include "src/compiler/pipeline.h"
 #include "src/compiler/raw-machine-assembler.h"
 #include "src/compiler/scheduler.h"
 
 namespace v8 {
@@ skipping 58 matching lines @@
 
 void RawMachineAssembler::Branch(Node* condition, Label* true_val,
                                  Label* false_val) {
   DCHECK(current_block_ != schedule()->end());
   Node* branch = NewNode(common()->Branch(), condition);
   schedule()->AddBranch(CurrentBlock(), branch, Use(true_val), Use(false_val));
   current_block_ = NULL;
 }
 
 
+void RawMachineAssembler::Switch(Node* index, Label** succ_labels,
+                                 size_t succ_count) {
+  DCHECK_NE(schedule()->end(), current_block_);
+  Node* sw = NewNode(common()->Switch(succ_count), index);
+  BasicBlock** succ_blocks =
+      zone()->NewArray<BasicBlock*>(static_cast<int>(succ_count));
+  for (size_t index = 0; index < succ_count; ++index) {
+    succ_blocks[index] = Use(succ_labels[index]);
+  }
+  schedule()->AddSwitch(CurrentBlock(), sw, succ_blocks, succ_count);
+  current_block_ = nullptr;
+}
+
+
 void RawMachineAssembler::Return(Node* value) {
   schedule()->AddReturn(CurrentBlock(), value);
   current_block_ = NULL;
 }
 
 
 Node* RawMachineAssembler::CallFunctionStub0(Node* function, Node* receiver,
                                              Node* context, Node* frame_state,
                                              CallFunctionFlags flags) {
   Callable callable = CodeFactory::CallFunction(isolate(), 0, flags);
@@ skipping 70 matching lines @@
   Node* node = graph()->NewNode(op, input_count, inputs, incomplete);
   BasicBlock* block = op->opcode() == IrOpcode::kParameter ? schedule()->start()
                                                            : CurrentBlock();
   schedule()->AddNode(block, node);
   return node;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8