+};
+
+/// PassManagerPrettyStackEntry - This is used to print informative information
+/// about what pass is running when/if a stack trace is generated.
+class PassManagerPrettyStackEntry : public PrettyStackTraceEntry {
+ Pass *P;
+ Value *V;
+ Module *M;
+public:
+ explicit PassManagerPrettyStackEntry(Pass *p)
+ : P(p), V(0), M(0) {} // When P is releaseMemory'd.
+ PassManagerPrettyStackEntry(Pass *p, Value &v)
+ : P(p), V(&v), M(0) {} // When P is run on V
+ PassManagerPrettyStackEntry(Pass *p, Module &m)
+ : P(p), V(0), M(&m) {} // When P is run on M
+
+ /// print - Emit information about this stack frame to OS.
+ virtual void print(raw_ostream &OS) const;
+};
+
+
+//===----------------------------------------------------------------------===//
+// PMStack
+//
+/// PMStack - This class implements a stack data structure of PMDataManager
+/// pointers.
+///
+/// Top level pass managers (see PassManager.cpp) maintain active Pass Managers
+/// using PMStack. Each Pass implements assignPassManager() to connect itself
+/// with appropriate manager. assignPassManager() walks PMStack to find
+/// suitable manager.
+class PMStack {
+public:
+ typedef std::vector<PMDataManager *>::const_reverse_iterator iterator;
+ iterator begin() const { return S.rbegin(); }
+ iterator end() const { return S.rend(); }
+
+ void pop();
+ PMDataManager *top() const { return S.back(); }
+ void push(PMDataManager *PM);
+ bool empty() const { return S.empty(); }
+
+ void dump() const;
+
+private:
+ std::vector<PMDataManager *> S;
+};
+