[turbofan] Add checked load/store operators.

src/compiler/simplified-operator.h

 // 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.
 
 #ifndef V8_COMPILER_SIMPLIFIED_OPERATOR_H_
 #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_
 
 #include <iosfwd>
 
 #include "src/compiler/machine-type.h"
@@ skipping 15 matching lines @@
 // Forward declarations.
 class Operator;
 struct SimplifiedOperatorGlobalCache;
 
 
 enum BaseTaggedness { kUntaggedBase, kTaggedBase };
 
 std::ostream& operator<<(std::ostream&, BaseTaggedness);
 
 
+// An access descriptor for loads/stores of array buffers.
+class BufferAccess FINAL {
+ public:
+  explicit BufferAccess(ExternalArrayType external_array_type)
+      : external_array_type_(external_array_type) {}
+
+  ExternalArrayType external_array_type() const { return external_array_type_; }
+  MachineType machine_type() const;
+
+ private:
+  ExternalArrayType const external_array_type_;
+};
+
+bool operator==(BufferAccess, BufferAccess);
+bool operator!=(BufferAccess, BufferAccess);
+
+size_t hash_value(BufferAccess);
+
+std::ostream& operator<<(std::ostream&, BufferAccess);
+
+BufferAccess const BufferAccessOf(const Operator* op) WARN_UNUSED_RESULT;
+
+
 // An access descriptor for loads/stores of fixed structures like field
 // accesses of heap objects. Accesses from either tagged or untagged base
 // pointers are supported; untagging is done automatically during lowering.
 struct FieldAccess {
   BaseTaggedness base_is_tagged;  // specifies if the base pointer is tagged.
   int offset;                     // offset of the field, without tag.
   MaybeHandle<Name> name;         // debugging only.
   Type* type;                     // type of the field.
   MachineType machine_type;       // machine type of the field.
 
   int tag() const { return base_is_tagged == kTaggedBase ? kHeapObjectTag : 0; }
 };
 
 bool operator==(FieldAccess const&, FieldAccess const&);
 bool operator!=(FieldAccess const&, FieldAccess const&);
 
 size_t hash_value(FieldAccess const&);
 
 std::ostream& operator<<(std::ostream&, FieldAccess const&);
 
-
-// The bound checking mode for ElementAccess below.
-enum BoundsCheckMode { kNoBoundsCheck, kTypedArrayBoundsCheck };
-
-std::ostream& operator<<(std::ostream&, BoundsCheckMode);
+FieldAccess const& FieldAccessOf(const Operator* op) WARN_UNUSED_RESULT;
 
 
 // An access descriptor for loads/stores of indexed structures like characters
 // in strings or off-heap backing stores. Accesses from either tagged or
 // untagged base pointers are supported; untagging is done automatically during
 // lowering.
 struct ElementAccess {
-  BoundsCheckMode bounds_check;   // specifies the bounds checking mode.
   BaseTaggedness base_is_tagged;  // specifies if the base pointer is tagged.
   int header_size;                // size of the header, without tag.
   Type* type;                     // type of the element.
   MachineType machine_type;       // machine type of the element.
 
   int tag() const { return base_is_tagged == kTaggedBase ? kHeapObjectTag : 0; }
 };
 
 bool operator==(ElementAccess const&, ElementAccess const&);
 bool operator!=(ElementAccess const&, ElementAccess const&);
 
 size_t hash_value(ElementAccess const&);
 
 std::ostream& operator<<(std::ostream&, ElementAccess const&);
 
-
-// If the accessed object is not a heap object, add this to the header_size.
-static const int kNonHeapObjectHeaderSize = kHeapObjectTag;
-
-
-const FieldAccess& FieldAccessOf(const Operator* op) WARN_UNUSED_RESULT;
-const ElementAccess& ElementAccessOf(const Operator* op) WARN_UNUSED_RESULT;
+ElementAccess const& ElementAccessOf(const Operator* op) WARN_UNUSED_RESULT;
 
 
 // Interface for building simplified operators, which represent the
 // medium-level operations of V8, including adding numbers, allocating objects,
 // indexing into objects and arrays, etc.
 // All operators are typed but many are representation independent.
 
 // Number values from JS can be in one of these representations:
 //   - Tagged: word-sized integer that is either
 //     - a signed small integer (31 or 32 bits plus a tag)
@@ skipping 41 matching lines @@
   const Operator* ChangeTaggedToFloat64();
   const Operator* ChangeInt32ToTagged();
   const Operator* ChangeUint32ToTagged();
   const Operator* ChangeFloat64ToTagged();
   const Operator* ChangeBoolToBit();
   const Operator* ChangeBitToBool();
 
   const Operator* ObjectIsSmi();
   const Operator* ObjectIsNonNegativeSmi();
 
-  const Operator* LoadField(const FieldAccess&);
-  const Operator* StoreField(const FieldAccess&);
+  const Operator* LoadField(FieldAccess const&);
+  const Operator* StoreField(FieldAccess const&);
+
+  // load-buffer buffer, offset, length
+  const Operator* LoadBuffer(BufferAccess);
+
+  // store-buffer buffer, offset, length, value
+  const Operator* StoreBuffer(BufferAccess);
 
   // load-element [base + index], length
   const Operator* LoadElement(ElementAccess const&);
 
   // store-element [base + index], length, value
   const Operator* StoreElement(ElementAccess const&);
 
  private:
   Zone* zone() const { return zone_; }
 
   const SimplifiedOperatorGlobalCache& cache_;
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_OPERATOR_H_