1 files changed, 77 insertions, 0 deletions
diff --git a/src/jit/phase.h b/src/jit/phase.h
new file mode 100644
index 0000000000..d8e2940089
--- /dev/null
+++ b/src/jit/phase.h
@@ -0,0 +1,77 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*****************************************************************************/
+#ifndef _PHASE_H_
+#define _PHASE_H_
+
+class Phase
+{
+public:
+    virtual void Run();
+
+protected:
+    Phase(Compiler* _comp, const char* _name, Phases _phase = PHASE_NUMBER_OF) : comp(_comp), name(_name), phase(_phase)
+    {
+    }
+
+    virtual void PrePhase();
+    virtual void DoPhase() = 0;
+    virtual void PostPhase();
+
+    Compiler*   comp;
+    const char* name;
+    Phases      phase;
+};
+
+inline void Phase::Run()
+{
+    PrePhase();
+    DoPhase();
+    PostPhase();
+}
+
+inline void Phase::PrePhase()
+{
+#ifdef DEBUG
+    if (VERBOSE)
+    {
+        printf("*************** In %s\n", name);
+        printf("Trees before %s\n", name);
+        comp->fgDispBasicBlocks(true);
+    }
+
+    if (comp->expensiveDebugCheckLevel >= 2)
+    {
+        // If everyone used the Phase class, this would duplicate the PostPhase() from the previous phase.
+        // But, not everyone does, so go ahead and do the check here, too.
+        comp->fgDebugCheckBBlist();
+        comp->fgDebugCheckLinks();
+    }
+#endif // DEBUG
+}
+
+inline void Phase::PostPhase()
+{
+#ifdef DEBUG
+    if (VERBOSE)
+    {
+        printf("*************** Exiting %s\n", name);
+        printf("Trees after %s\n", name);
+        comp->fgDispBasicBlocks(true);
+    }
+#endif // DEBUG
+
+    if (phase != PHASE_NUMBER_OF)
+    {
+        comp->EndPhase(phase);
+    }
+
+#ifdef DEBUG
+    comp->fgDebugCheckBBlist();
+    comp->fgDebugCheckLinks();
+#endif // DEBUG
+}
+
+#endif /* End of _PHASE_H_ */