-//===- llvm/Pass.h - Base class for XForm Passes -----------------*- C++ -*--=//
+//===- llvm/Pass.h - Base class for Passes ----------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file defines a base class that indicates that a specified class is a
// transformation pass implementation.
//
-// Pass's are designed this way so that it is possible to run passes in a cache
+// Passes are designed this way so that it is possible to run passes in a cache
// and organizationally optimal order without having to specify it at the front
// end. This allows arbitrary passes to be strung together and have them
// executed as effeciently as possible.
//
// Passes should extend one of the classes below, depending on the guarantees
// that it can make about what will be modified as it is run. For example, most
-// global optimizations should derive from MethodPass, because they do not add
-// or delete methods, they operate on the internals of the method.
+// global optimizations should derive from FunctionPass, because they do not add
+// or delete functions, they operate on the internals of the function.
+//
+// Note that this file #includes PassSupport.h and PassAnalysisSupport.h (at the
+// bottom), so the APIs exposed by these files are also automatically available
+// to all users of this file.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_PASS_H
#define LLVM_PASS_H
-#include <vector>
-#include <map>
-class Value;
+#include <string>
+
+namespace llvm {
+
class BasicBlock;
-class Method;
+class Function;
class Module;
-class AnalysisID;
-class Pass;
-template<class UnitType> class PassManagerT;
-struct AnalysisResolver;
+class AnalysisUsage;
+class PassInfo;
+class ImmutablePass;
+class PMStack;
+class AnalysisResolver;
+class PMDataManager;
+class raw_ostream;
+class StringRef;
+
+// AnalysisID - Use the PassInfo to identify a pass...
+typedef const void* AnalysisID;
+
+/// Different types of internal pass managers. External pass managers
+/// (PassManager and FunctionPassManager) are not represented here.
+/// Ordering of pass manager types is important here.
+enum PassManagerType {
+ PMT_Unknown = 0,
+ PMT_ModulePassManager = 1, ///< MPPassManager
+ PMT_CallGraphPassManager, ///< CGPassManager
+ PMT_FunctionPassManager, ///< FPPassManager
+ PMT_LoopPassManager, ///< LPPassManager
+ PMT_RegionPassManager, ///< RGPassManager
+ PMT_BasicBlockPassManager, ///< BBPassManager
+ PMT_Last
+};
+
+// Different types of passes.
+enum PassKind {
+ PT_BasicBlock,
+ PT_Region,
+ PT_Loop,
+ PT_Function,
+ PT_CallGraphSCC,
+ PT_Module,
+ PT_PassManager
+};
//===----------------------------------------------------------------------===//
-// Pass interface - Implemented by all 'passes'. Subclass this if you are an
-// interprocedural optimization or you do not fit into any of the more
-// constrained passes described below.
-//
+/// Pass interface - Implemented by all 'passes'. Subclass this if you are an
+/// interprocedural optimization or you do not fit into any of the more
+/// constrained passes described below.
+///
class Pass {
- friend class AnalysisResolver;
- AnalysisResolver *Resolver; // AnalysisResolver this pass is owned by...
+ AnalysisResolver *Resolver; // Used to resolve analysis
+ const void *PassID;
+ PassKind Kind;
+ void operator=(const Pass&); // DO NOT IMPLEMENT
+ Pass(const Pass &); // DO NOT IMPLEMENT
+
public:
- typedef std::vector<AnalysisID> AnalysisSet;
-
- inline Pass(AnalysisResolver *AR = 0) : Resolver(AR) {}
- inline virtual ~Pass() {} // Destructor is virtual so we can be subclassed
-
-
- // run - Run this pass, returning true if a modification was made to the
- // module argument. This should be implemented by all concrete subclasses.
- //
- virtual bool run(Module *M) = 0;
-
- // getAnalysisUsageInfo - This function should be overriden by passes that
- // need analysis information to do their job. If a pass specifies that it
- // uses a particular analysis result to this function, it can then use the
- // getAnalysis<AnalysisType>() function, below.
- //
- // The Destroyed vector is used to communicate what analyses are invalidated
- // by this pass. This is critical to specify so that the PassManager knows
- // which analysis must be rerun after this pass has proceeded. Analysis are
- // only invalidated if run() returns true.
- //
- // The Provided vector is used for passes that provide analysis information,
- // these are the analysis passes themselves. All analysis passes should
- // override this method to return themselves in the provided set.
- //
- virtual void getAnalysisUsageInfo(AnalysisSet &Required,
- AnalysisSet &Destroyed,
- AnalysisSet &Provided) {
- // By default, no analysis results are used or destroyed.
+ explicit Pass(PassKind K, char &pid);
+ virtual ~Pass();
+
+
+ PassKind getPassKind() const { return Kind; }
+
+ /// getPassName - Return a nice clean name for a pass. This usually
+ /// implemented in terms of the name that is registered by one of the
+ /// Registration templates, but can be overloaded directly.
+ ///
+ virtual const char *getPassName() const;
+
+ /// getPassID - Return the PassID number that corresponds to this pass.
+ virtual AnalysisID getPassID() const {
+ return PassID;
}
-#ifndef NDEBUG
+ /// print - Print out the internal state of the pass. This is called by
+ /// Analyze to print out the contents of an analysis. Otherwise it is not
+ /// necessary to implement this method. Beware that the module pointer MAY be
+ /// null. This automatically forwards to a virtual function that does not
+ /// provide the Module* in case the analysis doesn't need it it can just be
+ /// ignored.
+ ///
+ virtual void print(raw_ostream &O, const Module *M) const;
+ void dump() const; // dump - Print to stderr.
+
+ /// createPrinterPass - Get a Pass appropriate to print the IR this
+ /// pass operates one (Module, Function or MachineFunction).
+ virtual Pass *createPrinterPass(raw_ostream &O,
+ const std::string &Banner) const = 0;
+
+ /// Each pass is responsible for assigning a pass manager to itself.
+ /// PMS is the stack of available pass manager.
+ virtual void assignPassManager(PMStack &,
+ PassManagerType) {}
+ /// Check if available pass managers are suitable for this pass or not.
+ virtual void preparePassManager(PMStack &);
+
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const;
+
+ // Access AnalysisResolver
+ void setResolver(AnalysisResolver *AR);
+ AnalysisResolver *getResolver() const { return Resolver; }
+
+ /// getAnalysisUsage - This function should be overriden by passes that need
+ /// analysis information to do their job. If a pass specifies that it uses a
+ /// particular analysis result to this function, it can then use the
+ /// getAnalysis<AnalysisType>() function, below.
+ ///
+ virtual void getAnalysisUsage(AnalysisUsage &) const;
+
+ /// releaseMemory() - This member can be implemented by a pass if it wants to
+ /// be able to release its memory when it is no longer needed. The default
+ /// behavior of passes is to hold onto memory for the entire duration of their
+ /// lifetime (which is the entire compile time). For pipelined passes, this
+ /// is not a big deal because that memory gets recycled every time the pass is
+ /// invoked on another program unit. For IP passes, it is more important to
+ /// free memory when it is unused.
+ ///
+ /// Optionally implement this function to release pass memory when it is no
+ /// longer used.
+ ///
+ virtual void releaseMemory();
+
+ /// getAdjustedAnalysisPointer - This method is used when a pass implements
+ /// an analysis interface through multiple inheritance. If needed, it should
+ /// override this to adjust the this pointer as needed for the specified pass
+ /// info.
+ virtual void *getAdjustedAnalysisPointer(AnalysisID ID);
+ virtual ImmutablePass *getAsImmutablePass();
+ virtual PMDataManager *getAsPMDataManager();
+
+ /// verifyAnalysis() - This member can be implemented by a analysis pass to
+ /// check state of analysis information.
+ virtual void verifyAnalysis() const;
+
// dumpPassStructure - Implement the -debug-passes=PassStructure option
virtual void dumpPassStructure(unsigned Offset = 0);
-#endif
-protected:
- // getAnalysis<AnalysisType>() - This function is used by subclasses to get to
- // the analysis information that they claim to use by overriding the
- // getAnalysisUsageInfo function.
- //
+ // lookupPassInfo - Return the pass info object for the specified pass class,
+ // or null if it is not known.
+ static const PassInfo *lookupPassInfo(const void *TI);
+
+ // lookupPassInfo - Return the pass info object for the pass with the given
+ // argument string, or null if it is not known.
+ static const PassInfo *lookupPassInfo(StringRef Arg);
+
+ /// getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to
+ /// get analysis information that might be around, for example to update it.
+ /// This is different than getAnalysis in that it can fail (if the analysis
+ /// results haven't been computed), so should only be used if you can handle
+ /// the case when the analysis is not available. This method is often used by
+ /// transformation APIs to update analysis results for a pass automatically as
+ /// the transform is performed.
+ ///
+ template<typename AnalysisType> AnalysisType *
+ getAnalysisIfAvailable() const; // Defined in PassAnalysisSupport.h
+
+ /// mustPreserveAnalysisID - This method serves the same function as
+ /// getAnalysisIfAvailable, but works if you just have an AnalysisID. This
+ /// obviously cannot give you a properly typed instance of the class if you
+ /// don't have the class name available (use getAnalysisIfAvailable if you
+ /// do), but it can tell you if you need to preserve the pass at least.
+ ///
+ bool mustPreserveAnalysisID(char &AID) const;
+
+ /// getAnalysis<AnalysisType>() - This function is used by subclasses to get
+ /// to the analysis information that they claim to use by overriding the
+ /// getAnalysisUsage function.
+ ///
template<typename AnalysisType>
- AnalysisType &getAnalysis(AnalysisID AID = AnalysisType::ID) {
- assert(Resolver && "Pass not resident in a PassManager object!");
- return *(AnalysisType*)Resolver->getAnalysis(AID);
- }
+ AnalysisType &getAnalysis() const; // Defined in PassAnalysisSupport.h
+
+ template<typename AnalysisType>
+ AnalysisType &getAnalysis(Function &F); // Defined in PassAnalysisSupport.h
+
+ template<typename AnalysisType>
+ AnalysisType &getAnalysisID(AnalysisID PI) const;
-private:
- friend class PassManagerT<Module>;
- friend class PassManagerT<Method>;
- friend class PassManagerT<BasicBlock>;
- virtual void addToPassManager(PassManagerT<Module> *PM,
- AnalysisSet &Destroyed,
- AnalysisSet &Provided);
+ template<typename AnalysisType>
+ AnalysisType &getAnalysisID(AnalysisID PI, Function &F);
};
//===----------------------------------------------------------------------===//
-// MethodPass class - This class is used to implement most global optimizations.
-// Optimizations should subclass this class if they meet the following
-// constraints:
-// 1. Optimizations are organized globally, ie a method at a time
-// 2. Optimizing a method does not cause the addition or removal of any methods
-// in the module
-//
-struct MethodPass : public Pass {
- // doInitialization - Virtual method overridden by subclasses to do
- // any neccesary per-module initialization.
- //
- virtual bool doInitialization(Module *M) { return false; }
-
- // runOnMethod - Virtual method overriden by subclasses to do the per-method
- // processing of the pass.
- //
- virtual bool runOnMethod(Method *M) = 0;
-
- // doFinalization - Virtual method overriden by subclasses to do any post
- // processing needed after all passes have run.
- //
- virtual bool doFinalization(Module *M) { return false; }
-
- // run - On a module, we run this pass by initializing, ronOnMethod'ing once
- // for every method in the module, then by finalizing.
- //
- virtual bool run(Module *M);
-
- // run - On a method, we simply initialize, run the method, then finalize.
- //
- bool run(Method *M);
-
-private:
- friend class PassManagerT<Module>;
- friend class PassManagerT<Method>;
- friend class PassManagerT<BasicBlock>;
- virtual void addToPassManager(PassManagerT<Module> *PM,AnalysisSet &Destroyed,
- AnalysisSet &Provided);
- virtual void addToPassManager(PassManagerT<Method> *PM,AnalysisSet &Destroyed,
- AnalysisSet &Provided);
+/// ModulePass class - This class is used to implement unstructured
+/// interprocedural optimizations and analyses. ModulePasses may do anything
+/// they want to the program.
+///
+class ModulePass : public Pass {
+public:
+ /// createPrinterPass - Get a module printer pass.
+ Pass *createPrinterPass(raw_ostream &O, const std::string &Banner) const;
+
+ /// runOnModule - Virtual method overriden by subclasses to process the module
+ /// being operated on.
+ virtual bool runOnModule(Module &M) = 0;
+
+ virtual void assignPassManager(PMStack &PMS,
+ PassManagerType T);
+
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const;
+
+ explicit ModulePass(char &pid) : Pass(PT_Module, pid) {}
+ // Force out-of-line virtual method.
+ virtual ~ModulePass();
};
+//===----------------------------------------------------------------------===//
+/// ImmutablePass class - This class is used to provide information that does
+/// not need to be run. This is useful for things like target information and
+/// "basic" versions of AnalysisGroups.
+///
+class ImmutablePass : public ModulePass {
+public:
+ /// initializePass - This method may be overriden by immutable passes to allow
+ /// them to perform various initialization actions they require. This is
+ /// primarily because an ImmutablePass can "require" another ImmutablePass,
+ /// and if it does, the overloaded version of initializePass may get access to
+ /// these passes with getAnalysis<>.
+ ///
+ virtual void initializePass();
+
+ virtual ImmutablePass *getAsImmutablePass() { return this; }
+
+ /// ImmutablePasses are never run.
+ ///
+ bool runOnModule(Module &) { return false; }
+
+ explicit ImmutablePass(char &pid)
+ : ModulePass(pid) {}
+
+ // Force out-of-line virtual method.
+ virtual ~ImmutablePass();
+};
//===----------------------------------------------------------------------===//
-// BasicBlockPass class - This class is used to implement most local
-// optimizations. Optimizations should subclass this class if they
-// meet the following constraints:
-// 1. Optimizations are local, operating on either a basic block or
-// instruction at a time.
-// 2. Optimizations do not modify the CFG of the contained method, or any
-// other basic block in the method.
-// 3. Optimizations conform to all of the contstraints of MethodPass's.
-//
-struct BasicBlockPass : public MethodPass {
- // runOnBasicBlock - Virtual method overriden by subclasses to do the
- // per-basicblock processing of the pass.
- //
- virtual bool runOnBasicBlock(BasicBlock *M) = 0;
-
- // To run this pass on a method, we simply call runOnBasicBlock once for each
- // method.
- //
- virtual bool runOnMethod(Method *BB);
-
- // To run directly on the basic block, we initialize, runOnBasicBlock, then
- // finalize.
- //
- bool run(BasicBlock *BB);
-
-private:
- friend class PassManagerT<Method>;
- friend class PassManagerT<BasicBlock>;
- virtual void addToPassManager(PassManagerT<Method> *PM,AnalysisSet &Destroyed,
- AnalysisSet &Provided);
- virtual void addToPassManager(PassManagerT<BasicBlock> *PM,
- AnalysisSet &Destroyed,
- AnalysisSet &Provided);
+/// FunctionPass class - This class is used to implement most global
+/// optimizations. Optimizations should subclass this class if they meet the
+/// following constraints:
+///
+/// 1. Optimizations are organized globally, i.e., a function at a time
+/// 2. Optimizing a function does not cause the addition or removal of any
+/// functions in the module
+///
+class FunctionPass : public Pass {
+public:
+ explicit FunctionPass(char &pid) : Pass(PT_Function, pid) {}
+
+ /// createPrinterPass - Get a function printer pass.
+ Pass *createPrinterPass(raw_ostream &O, const std::string &Banner) const;
+
+ /// doInitialization - Virtual method overridden by subclasses to do
+ /// any necessary per-module initialization.
+ ///
+ virtual bool doInitialization(Module &);
+
+ /// runOnFunction - Virtual method overriden by subclasses to do the
+ /// per-function processing of the pass.
+ ///
+ virtual bool runOnFunction(Function &F) = 0;
+
+ /// doFinalization - Virtual method overriden by subclasses to do any post
+ /// processing needed after all passes have run.
+ ///
+ virtual bool doFinalization(Module &);
+
+ virtual void assignPassManager(PMStack &PMS,
+ PassManagerType T);
+
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const;
};
-// CreatePass - Helper template to invoke the constructor for the AnalysisID
-// class. Note that this should be a template internal to AnalysisID, but
-// GCC 2.95.3 crashes if we do that, doh.
-//
-template<class AnalysisType>
-static Pass *CreatePass(AnalysisID ID) { return new AnalysisType(ID); }
//===----------------------------------------------------------------------===//
-// AnalysisID - This class is used to uniquely identify an analysis pass that
-// is referenced by a transformation.
-//
-class AnalysisID {
- static unsigned NextID; // Next ID # to deal out...
- unsigned ID; // Unique ID for this analysis
- Pass *(*Constructor)(AnalysisID); // Constructor to return the Analysis
-
- AnalysisID(); // Disable default ctor
- AnalysisID(unsigned id, Pass *(*Ct)(AnalysisID)) : ID(id), Constructor(Ct) {}
+/// BasicBlockPass class - This class is used to implement most local
+/// optimizations. Optimizations should subclass this class if they
+/// meet the following constraints:
+/// 1. Optimizations are local, operating on either a basic block or
+/// instruction at a time.
+/// 2. Optimizations do not modify the CFG of the contained function, or any
+/// other basic block in the function.
+/// 3. Optimizations conform to all of the constraints of FunctionPasses.
+///
+class BasicBlockPass : public Pass {
public:
- // create - the only way to define a new AnalysisID. This static method is
- // supposed to be used to define the class static AnalysisID's that are
- // provided by analysis passes. In the implementation (.cpp) file for the
- // class, there should be a line that looks like this (using CallGraph as an
- // example):
- //
- // AnalysisID CallGraph::ID(AnalysisID::create<CallGraph>());
- //
- template<class AnalysisType>
- static AnalysisID create() {
- return AnalysisID(NextID++, CreatePass<AnalysisType>);
- }
+ explicit BasicBlockPass(char &pid) : Pass(PT_BasicBlock, pid) {}
- inline Pass *createPass() const { return Constructor(*this); }
+ /// createPrinterPass - Get a function printer pass.
+ Pass *createPrinterPass(raw_ostream &O, const std::string &Banner) const;
- inline bool operator==(const AnalysisID &A) const {
- return A.ID == ID;
- }
- inline bool operator!=(const AnalysisID &A) const {
- return A.ID != ID;
- }
- inline bool operator<(const AnalysisID &A) const {
- return ID < A.ID;
- }
-};
+ /// doInitialization - Virtual method overridden by subclasses to do
+ /// any necessary per-module initialization.
+ ///
+ virtual bool doInitialization(Module &);
+ /// doInitialization - Virtual method overridden by BasicBlockPass subclasses
+ /// to do any necessary per-function initialization.
+ ///
+ virtual bool doInitialization(Function &);
-//===----------------------------------------------------------------------===//
-// AnalysisResolver - Simple interface implemented by PassManagers objects that
-// is used to pull analysis information out of them.
-//
-struct AnalysisResolver {
- virtual Pass *getAnalysisOrNullUp(AnalysisID ID) = 0;
- virtual Pass *getAnalysisOrNullDown(AnalysisID ID) = 0;
- Pass *getAnalysis(AnalysisID ID) {
- Pass *Result = getAnalysisOrNullUp(ID);
- assert(Result && "Pass has an incorrect analysis uses set!");
- return Result;
- }
- virtual unsigned getDepth() const = 0;
-protected:
- void setAnalysisResolver(Pass *P, AnalysisResolver *AR);
+ /// runOnBasicBlock - Virtual method overriden by subclasses to do the
+ /// per-basicblock processing of the pass.
+ ///
+ virtual bool runOnBasicBlock(BasicBlock &BB) = 0;
+
+ /// doFinalization - Virtual method overriden by BasicBlockPass subclasses to
+ /// do any post processing needed after all passes have run.
+ ///
+ virtual bool doFinalization(Function &);
+
+ /// doFinalization - Virtual method overriden by subclasses to do any post
+ /// processing needed after all passes have run.
+ ///
+ virtual bool doFinalization(Module &);
+
+ virtual void assignPassManager(PMStack &PMS,
+ PassManagerType T);
+
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const;
};
+/// If the user specifies the -time-passes argument on an LLVM tool command line
+/// then the value of this boolean will be true, otherwise false.
+/// @brief This is the storage for the -time-passes option.
+extern bool TimePassesIsEnabled;
+} // End llvm namespace
+
+// Include support files that contain important APIs commonly used by Passes,
+// but that we want to separate out to make it easier to read the header files.
+//
+#include "llvm/PassSupport.h"
+#include "llvm/PassAnalysisSupport.h"
#endif
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