1 files changed, 81 insertions, 0 deletions
diff --git a/js/src/jit/AliasAnalysisShared.h b/js/src/jit/AliasAnalysisShared.h
new file mode 100644
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+++ b/js/src/jit/AliasAnalysisShared.h
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_AliasAnalysisShared_h
+#define jit_AliasAnalysisShared_h
+
+#include "jit/MIR.h"
+#include "jit/MIRGraph.h"
+
+namespace js {
+namespace jit {
+
+class MIRGraph;
+
+class AliasAnalysisShared
+{
+  protected:
+    MIRGenerator* mir;
+    MIRGraph& graph_;
+
+  public:
+    AliasAnalysisShared(MIRGenerator* mir, MIRGraph& graph)
+      : mir(mir),
+        graph_(graph)
+    {}
+
+    virtual MOZ_MUST_USE bool analyze() {
+        return true;
+    }
+
+    static MDefinition::AliasType genericMightAlias(const MDefinition* load,
+                                                    const MDefinition* store);
+
+
+  protected:
+    void spewDependencyList();
+
+    TempAllocator& alloc() const {
+        return graph_.alloc();
+    }
+};
+
+// Iterates over the flags in an AliasSet.
+class AliasSetIterator
+{
+  private:
+    uint32_t flags;
+    unsigned pos;
+
+  public:
+    explicit AliasSetIterator(AliasSet set)
+      : flags(set.flags()), pos(0)
+    {
+        while (flags && (flags & 1) == 0) {
+            flags >>= 1;
+            pos++;
+        }
+    }
+    AliasSetIterator& operator ++(int) {
+        do {
+            flags >>= 1;
+            pos++;
+        } while (flags && (flags & 1) == 0);
+        return *this;
+    }
+    explicit operator bool() const {
+        return !!flags;
+    }
+    unsigned operator*() const {
+        MOZ_ASSERT(pos < AliasSet::NumCategories);
+        return pos;
+    }
+};
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_AliasAnalysisShared_h */