[turbofan] Track multiple maps for LoadElimination.

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/operator.h"
 #include "src/compiler/types.h"
 #include "src/handles.h"
 #include "src/machine-type.h"
 #include "src/objects.h"
+#include "src/zone/zone-handle-set.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class Zone;
 
 namespace compiler {
 
 // Forward declarations.
@@ skipping 108 matching lines @@
   kCheckForMinusZero,
   kDontCheckForMinusZero,
 };
 
 size_t hash_value(CheckForMinusZeroMode);
 
 std::ostream& operator<<(std::ostream&, CheckForMinusZeroMode);
 
 CheckForMinusZeroMode CheckMinusZeroModeOf(const Operator*) WARN_UNUSED_RESULT;
 
+// A descriptor for map checks.
+class CheckMapsParameters final {
+ public:
+  explicit CheckMapsParameters(ZoneHandleSet<Map> const& maps) : maps_(maps) {}
+
+  ZoneHandleSet<Map> const& maps() const { return maps_; }
+
+ private:
+  ZoneHandleSet<Map> const maps_;
+};
+
+bool operator==(CheckMapsParameters const&, CheckMapsParameters const&);
+bool operator!=(CheckMapsParameters const&, CheckMapsParameters const&);
+
+size_t hash_value(CheckMapsParameters const&);
+
+std::ostream& operator<<(std::ostream&, CheckMapsParameters const&);
+
+CheckMapsParameters const& CheckMapsParametersOf(Operator const*)
+    WARN_UNUSED_RESULT;
+
 // A descriptor for growing elements backing stores.
 enum class GrowFastElementsFlag : uint8_t {
   kNone = 0u,
   kArrayObject = 1u << 0,     // Update JSArray::length field.
   kHoleyElements = 1u << 1,   // Backing store is holey.
   kDoubleElements = 1u << 2,  // Backing store contains doubles.
 };
 typedef base::Flags<GrowFastElementsFlag> GrowFastElementsFlags;
 
 DEFINE_OPERATORS_FOR_FLAGS(GrowFastElementsFlags)
@@ skipping 150 matching lines @@
   const Operator* ChangeUint32ToTagged();
   const Operator* ChangeFloat64ToTagged();
   const Operator* ChangeTaggedToBit();
   const Operator* ChangeBitToTagged();
   const Operator* TruncateTaggedToWord32();
   const Operator* TruncateTaggedToFloat64();
   const Operator* TruncateTaggedToBit();
 
   const Operator* CheckIf();
   const Operator* CheckBounds();
-  const Operator* CheckMaps(int map_input_count);
+  const Operator* CheckMaps(ZoneHandleSet<Map>);
 
   const Operator* CheckHeapObject();
   const Operator* CheckNumber();
   const Operator* CheckSmi();
   const Operator* CheckString();
 
   const Operator* CheckedInt32Add();
   const Operator* CheckedInt32Sub();
   const Operator* CheckedInt32Div();
   const Operator* CheckedInt32Mod();
@@ skipping 63 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_OPERATOR_H_