Add full TurboFan support for accessing SeqString contents.

src/compiler/js-intrinsic-lowering.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/js-intrinsic-lowering.h"
 
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
@@ skipping 35 matching lines @@
     case Runtime::kInlineJSValueGetValue:
       return ReduceJSValueGetValue(node);
     case Runtime::kInlineMapGetInstanceType:
       return ReduceMapGetInstanceType(node);
     case Runtime::kInlineMathClz32:
       return ReduceMathClz32(node);
     case Runtime::kInlineMathFloor:
       return ReduceMathFloor(node);
     case Runtime::kInlineMathSqrt:
       return ReduceMathSqrt(node);
+    case Runtime::kInlineOneByteSeqStringGetChar:
+      return ReduceSeqStringGetChar(node, String::ONE_BYTE_ENCODING);
+    case Runtime::kInlineOneByteSeqStringSetChar:
+      return ReduceSeqStringSetChar(node, String::ONE_BYTE_ENCODING);
     case Runtime::kInlineStringGetLength:
       return ReduceStringGetLength(node);
+    case Runtime::kInlineTwoByteSeqStringGetChar:
+      return ReduceSeqStringGetChar(node, String::TWO_BYTE_ENCODING);
+    case Runtime::kInlineTwoByteSeqStringSetChar:
+      return ReduceSeqStringSetChar(node, String::TWO_BYTE_ENCODING);
     case Runtime::kInlineValueOf:
       return ReduceValueOf(node);
     default:
       break;
   }
   return NoChange();
 }
 
 
 Reduction JSIntrinsicLowering::ReduceConstructDouble(Node* node) {
@@ skipping 146 matching lines @@
   if (!machine()->HasFloat64RoundDown()) return NoChange();
   return Change(node, machine()->Float64RoundDown());
 }
 
 
 Reduction JSIntrinsicLowering::ReduceMathSqrt(Node* node) {
   return Change(node, machine()->Float64Sqrt());
 }
 
 
+Reduction JSIntrinsicLowering::ReduceSeqStringGetChar(
+    Node* node, String::Encoding encoding) {
+  Node* effect = NodeProperties::GetEffectInput(node);
+  Node* control = NodeProperties::GetControlInput(node);
+  node->set_op(
+      simplified()->LoadElement(AccessBuilder::ForSeqStringChar(encoding)));
+  node->ReplaceInput(2, effect);
+  node->ReplaceInput(3, control);
+  node->TrimInputCount(4);
+  NodeProperties::ReplaceWithValue(node, node, node);
+  return Changed(node);
+}
+
+
+Reduction JSIntrinsicLowering::ReduceSeqStringSetChar(
+    Node* node, String::Encoding encoding) {
+  // Note: The intrinsic has a strange argument order, so we need to reshuffle.
+  Node* index = NodeProperties::GetValueInput(node, 0);
+  Node* chr = NodeProperties::GetValueInput(node, 1);
+  Node* string = NodeProperties::GetValueInput(node, 2);
+  Node* effect = NodeProperties::GetEffectInput(node);
+  Node* control = NodeProperties::GetControlInput(node);
+  node->set_op(
+      simplified()->StoreElement(AccessBuilder::ForSeqStringChar(encoding)));
+  node->ReplaceInput(0, string);
+  node->ReplaceInput(1, index);
+  node->ReplaceInput(2, chr);
+  node->ReplaceInput(3, effect);
+  node->ReplaceInput(4, control);
+  node->TrimInputCount(5);
+  NodeProperties::RemoveBounds(node);
+  NodeProperties::ReplaceWithValue(node, string, node);
+  return Changed(node);
+}
+
+
 Reduction JSIntrinsicLowering::ReduceStringGetLength(Node* node) {
   Node* value = NodeProperties::GetValueInput(node, 0);
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
   return Change(node, simplified()->LoadField(AccessBuilder::ForStringLength()),
                 value, effect, control);
 }
 
 
 Reduction JSIntrinsicLowering::ReduceValueOf(Node* node) {
@@ skipping 90 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSIntrinsicLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8