Move Hydrogen and Lithium to src/crankshaft/

src/hydrogen-alias-analysis.h

-// Copyright 2013 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_HYDROGEN_ALIAS_ANALYSIS_H_
-#define V8_HYDROGEN_ALIAS_ANALYSIS_H_
-
-#include "src/hydrogen.h"
-
-namespace v8 {
-namespace internal {
-
-enum HAliasing {
-  kMustAlias,
-  kMayAlias,
-  kNoAlias
-};
-
-
-// Defines the interface to alias analysis for the rest of the compiler.
-// A simple implementation can use only local reasoning, but a more powerful
-// analysis might employ points-to analysis.
-class HAliasAnalyzer : public ZoneObject {
- public:
-  // Simple alias analysis distinguishes allocations, parameters,
-  // and constants using only local reasoning.
-  HAliasing Query(HValue* a, HValue* b) {
-    // The same SSA value always references the same object.
-    if (a == b) return kMustAlias;
-
-    if (a->IsAllocate() || a->IsInnerAllocatedObject()) {
-      // Two non-identical allocations can never be aliases.
-      if (b->IsAllocate()) return kNoAlias;
-      if (b->IsInnerAllocatedObject()) return kNoAlias;
-      // An allocation can never alias a parameter or a constant.
-      if (b->IsParameter()) return kNoAlias;
-      if (b->IsConstant()) return kNoAlias;
-    }
-    if (b->IsAllocate() || b->IsInnerAllocatedObject()) {
-      // An allocation can never alias a parameter or a constant.
-      if (a->IsParameter()) return kNoAlias;
-      if (a->IsConstant()) return kNoAlias;
-    }
-
-    // Constant objects can be distinguished statically.
-    if (a->IsConstant()) {
-      // TODO(titzer): DataEquals() is more efficient, but that's protected.
-      return a->Equals(b) ? kMustAlias : kNoAlias;
-    }
-    return kMayAlias;
-  }
-
-  // Checks whether the objects referred to by the given instructions may
-  // ever be aliases. Note that this is more conservative than checking
-  // {Query(a, b) == kMayAlias}, since this method considers kMustAlias
-  // objects to also be may-aliasing.
-  inline bool MayAlias(HValue* a, HValue* b) {
-    return Query(a, b) != kNoAlias;
-  }
-
-  inline bool MustAlias(HValue* a, HValue* b) {
-    return Query(a, b) == kMustAlias;
-  }
-
-  inline bool NoAlias(HValue* a, HValue* b) {
-    return Query(a, b) == kNoAlias;
-  }
-};
-
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_HYDROGEN_ALIAS_ANALYSIS_H_