JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / dfg / DFGDoubleFormatState.h

diff --git a/dfg/DFGDoubleFormatState.h b/dfg/DFGDoubleFormatState.h
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+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef DFGDoubleFormatState_h
+#define DFGDoubleFormatState_h
+
+namespace JSC { namespace DFG {
+
+enum DoubleFormatState {
+    EmptyDoubleFormatState, // bottom
+    UsingDoubleFormat,
+    NotUsingDoubleFormat,
+    CantUseDoubleFormat // top
+};
+
+inline DoubleFormatState mergeDoubleFormatStates(DoubleFormatState a, DoubleFormatState b)
+{
+    switch (a) {
+    case EmptyDoubleFormatState:
+        return b;
+    case UsingDoubleFormat:
+        switch (b) {
+        case EmptyDoubleFormatState:
+        case UsingDoubleFormat:
+            return UsingDoubleFormat;
+        case NotUsingDoubleFormat:
+        case CantUseDoubleFormat:
+            return CantUseDoubleFormat;
+        }
+    case NotUsingDoubleFormat:
+        switch (b) {
+        case EmptyDoubleFormatState:
+        case NotUsingDoubleFormat:
+            return NotUsingDoubleFormat;
+        case UsingDoubleFormat:
+        case CantUseDoubleFormat:
+            return CantUseDoubleFormat;
+        }
+    case CantUseDoubleFormat:
+        return CantUseDoubleFormat;
+    }
+    ASSERT_NOT_REACHED();
+    return CantUseDoubleFormat;
+}
+
+inline bool mergeDoubleFormatState(DoubleFormatState& dest, DoubleFormatState src)
+{
+    DoubleFormatState newState = mergeDoubleFormatStates(dest, src);
+    if (newState == dest)
+        return false;
+    dest = newState;
+    return true;
+}
+
+inline const char* doubleFormatStateToString(DoubleFormatState state)
+{
+    switch (state) {
+    case EmptyDoubleFormatState:
+        return "Empty";
+    case UsingDoubleFormat:
+        return "DoubleFormat";
+    case NotUsingDoubleFormat:
+        return "ValueFormat";
+    case CantUseDoubleFormat:
+        return "ForceValue";
+    }
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+} } // namespace JSC::DFG
+
+#endif // DFGDoubleFormatState_h
+