[turbofan] Add the StackSlot operator to turbofan.

src/compiler/instruction-selector.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/instruction-selector.h"
 
 #include <limits>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/pipeline.h"
 #include "src/compiler/schedule.h"
 #include "src/compiler/state-values-utils.h"
 #include "src/deoptimizer.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 InstructionSelector::InstructionSelector(
     Zone* zone, size_t node_count, Linkage* linkage,
     InstructionSequence* sequence, Schedule* schedule,
-    SourcePositionTable* source_positions,
+    SourcePositionTable* source_positions, Frame* frame,
     SourcePositionMode source_position_mode, Features features)
     : zone_(zone),
       linkage_(linkage),
       sequence_(sequence),
       source_positions_(source_positions),
       source_position_mode_(source_position_mode),
       features_(features),
       schedule_(schedule),
       current_block_(nullptr),
       instructions_(zone),
       defined_(node_count, false, zone),
       used_(node_count, false, zone),
       virtual_registers_(node_count,
                          InstructionOperand::kInvalidVirtualRegister, zone),
-      scheduler_(nullptr) {
+      scheduler_(nullptr),
+      frame_(frame) {
   instructions_.reserve(node_count);
 }
 
 
 void InstructionSelector::SelectInstructions() {
   // Mark the inputs of all phis in loop headers as used.
   BasicBlockVector* blocks = schedule()->rpo_order();
   for (auto const block : *blocks) {
     if (!block->IsLoopHeader()) continue;
     DCHECK_LE(2u, block->PredecessorCount());
@@ skipping 1009 matching lines @@
     case IrOpcode::kFloat64RoundTiesEven:
       return MarkAsFloat64(node), VisitFloat64RoundTiesEven(node);
     case IrOpcode::kFloat64ExtractLowWord32:
       return MarkAsWord32(node), VisitFloat64ExtractLowWord32(node);
     case IrOpcode::kFloat64ExtractHighWord32:
       return MarkAsWord32(node), VisitFloat64ExtractHighWord32(node);
     case IrOpcode::kFloat64InsertLowWord32:
       return MarkAsFloat64(node), VisitFloat64InsertLowWord32(node);
     case IrOpcode::kFloat64InsertHighWord32:
       return MarkAsFloat64(node), VisitFloat64InsertHighWord32(node);
+    case IrOpcode::kStackSlot:
+      return VisitStackSlot(node);
     case IrOpcode::kLoadStackPointer:
       return VisitLoadStackPointer(node);
     case IrOpcode::kLoadFramePointer:
       return VisitLoadFramePointer(node);
     case IrOpcode::kCheckedLoad: {
       MachineRepresentation rep =
           CheckedLoadRepresentationOf(node->op()).representation();
       MarkAsRepresentation(rep, node);
       return VisitCheckedLoad(node);
     }
@@ skipping 47 matching lines @@
   inputs[1] = g.Label(sw.default_branch);
   for (size_t index = 0; index < sw.case_count; ++index) {
     int32_t value = sw.case_values[index];
     BasicBlock* branch = sw.case_branches[index];
     inputs[index * 2 + 2 + 0] = g.TempImmediate(value);
     inputs[index * 2 + 2 + 1] = g.Label(branch);
   }
   Emit(kArchLookupSwitch, 0, nullptr, input_count, inputs, 0, nullptr);
 }
 
+void InstructionSelector::VisitStackSlot(Node* node) {
+  MachineRepresentation rep = StackSlotRepresentationOf(node->op());

[titzer, 2016/01/28 09:02:18]

You should probably use ElemSizeLog2Of(MachineRepresentation) here.

[ahaas, 2016/01/28 14:55:44]

Done.

+  int size;
+  if (rep == MachineRepresentation::kFloat64) {
+    size = kDoubleSize;
+  } else if (rep == MachineRepresentation::kWord64) {
+    size = kInt64Size;
+  } else {
+    size = kPointerSize;
+  }
+  int slot = frame_->AllocateSpillSlot(size);
+  OperandGenerator g(this);
+
+  Emit(kArchStackSlot, g.DefineAsRegister(node),
+       sequence()->AddImmediate(Constant(slot)), 0, nullptr);
+}
 
 // 32 bit targets do not implement the following instructions.
 #if V8_TARGET_ARCH_32_BIT
 
 void InstructionSelector::VisitWord64And(Node* node) { UNIMPLEMENTED(); }
 
 
 void InstructionSelector::VisitWord64Or(Node* node) { UNIMPLEMENTED(); }
 
 
@@ skipping 479 matching lines @@
   return new (instruction_zone()) FrameStateDescriptor(
       instruction_zone(), state_info.type(), state_info.bailout_id(),
       state_info.state_combine(), parameters, locals, stack,
       state_info.shared_info(), outer_state);
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8