-//===- llvm/Pass.h - Base class for XForm Passes -----------------*- C++ -*--=//
+//===- llvm/Pass.h - Base class for Passes ----------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and 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.
#ifndef LLVM_PASS_H
#define LLVM_PASS_H
-#include <assert.h>
-
+#include "llvm/Support/Streams.h"
#include <vector>
+#include <deque>
#include <map>
#include <iosfwd>
-#include <typeinfo>
+#include <cassert>
+
+namespace llvm {
+
class Value;
class BasicBlock;
class Function;
class AnalysisUsage;
class PassInfo;
class ImmutablePass;
-template<class UnitType> class PassManagerT;
-struct AnalysisResolver;
+class PMStack;
+class AnalysisResolver;
+class PMDataManager;
// AnalysisID - Use the PassInfo to identify a pass...
typedef const PassInfo* 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_BasicBlockPassManager, /// BBPassManager
+ PMT_Last
+};
+
+typedef enum PassManagerType PassManagerType;
+
//===----------------------------------------------------------------------===//
/// 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...
- const PassInfo *PassInfoCache;
+ AnalysisResolver *Resolver; // Used to resolve analysis
+ intptr_t PassID;
// AnalysisImpls - This keeps track of which passes implement the interfaces
// that are required by the current pass (to implement getAnalysis()).
void operator=(const Pass&); // DO NOT IMPLEMENT
Pass(const Pass &); // DO NOT IMPLEMENT
public:
- Pass() : Resolver(0), PassInfoCache(0) {}
- virtual ~Pass() {} // Destructor is virtual so we can be subclassed
+ explicit Pass(intptr_t pid) : Resolver(0), PassID(pid) {}
+ virtual ~Pass();
/// 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, and if nothing
/// else is available, C++ RTTI will be consulted to get a SOMEWHAT
- /// intelligable name for the pass.
+ /// intelligible name for the pass.
///
virtual const char *getPassName() const;
///
const PassInfo *getPassInfo() const;
- /// run - Run this pass, returning true if a modification was made to the
+ /// runPass - 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;
+ virtual bool runPass(Module &M) { return false; }
+ virtual bool runPass(BasicBlock&) { return false; }
/// 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
- /// neccesary to implement this method. Beware that the module pointer MAY be
+ /// 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(std::ostream &O, const Module *M) const { print(O); }
- virtual void print(std::ostream &O) const;
+ virtual void print(std::ostream &O, const Module *M) const;
+ void print(std::ostream *O, const Module *M) const { if (O) print(*O, M); }
void dump() const; // dump - call print(std::cerr, 0);
+ /// Each pass is responsible for assigning a pass manager to itself.
+ /// PMS is the stack of available pass manager.
+ virtual void assignPassManager(PMStack &PMS,
+ PassManagerType T = PMT_Unknown) {}
+ /// Check if available pass managers are suitable for this pass or not.
+ virtual void preparePassManager(PMStack &PMS) {}
+
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const {
+ return PMT_Unknown;
+ }
+
+ // Access AnalysisResolver
+ inline void setResolver(AnalysisResolver *AR) {
+ assert (!Resolver && "Resolver is already set");
+ Resolver = AR;
+ }
+ inline AnalysisResolver *getResolver() {
+ assert (Resolver && "Resolver is not set");
+ 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
///
virtual void releaseMemory() {}
+ /// 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);
-
- // getPassInfo - Static method to get the pass information from a class name.
template<typename AnalysisClass>
static const PassInfo *getClassPassInfo() {
- return lookupPassInfo(typeid(AnalysisClass));
+ return lookupPassInfo(intptr_t(&AnalysisClass::ID));
}
// lookupPassInfo - Return the pass info object for the specified pass class,
// or null if it is not known.
- static const PassInfo *lookupPassInfo(const std::type_info &TI);
+ static const PassInfo *lookupPassInfo(intptr_t TI);
/// getAnalysisToUpdate<AnalysisType>() - This function is used by subclasses
/// to get to the analysis information that might be around that needs to be
/// automatically as the transform is performed.
///
template<typename AnalysisType>
- AnalysisType *getAnalysisToUpdate() const {
- assert(Resolver && "Pass not resident in a PassManager object!");
- const PassInfo *PI = getClassPassInfo<AnalysisType>();
- if (PI == 0) return 0;
- return dynamic_cast<AnalysisType*>(Resolver->getAnalysisToUpdate(PI));
- }
+ AnalysisType *getAnalysisToUpdate() const; // Defined in PassAnalysisSupport.h
/// mustPreserveAnalysisID - This method serves the same function as
/// getAnalysisToUpdate, but works if you just have an AnalysisID. This
/// getAnalysisUsage function.
///
template<typename AnalysisType>
- AnalysisType &getAnalysis() const {
- assert(Resolver && "Pass has not been inserted into a PassManager object!");
- const PassInfo *PI = getClassPassInfo<AnalysisType>();
- return getAnalysisID<AnalysisType>(PI);
- }
+ AnalysisType &getAnalysis() const; // Defined in PassAnalysisSupport.h
template<typename AnalysisType>
- AnalysisType &getAnalysisID(const PassInfo *PI) const {
- assert(Resolver && "Pass has not been inserted into a PassManager object!");
- assert(PI && "getAnalysis for unregistered pass!");
-
- // PI *must* appear in AnalysisImpls. Because the number of passes used
- // should be a small number, we just do a linear search over a (dense)
- // vector.
- Pass *ResultPass = 0;
- for (unsigned i = 0; ; ++i) {
- assert(i != AnalysisImpls.size() &&
- "getAnalysis*() called on an analysis that we not "
- "'required' by pass!");
- if (AnalysisImpls[i].first == PI) {
- ResultPass = AnalysisImpls[i].second;
- break;
- }
- }
-
- // Because the AnalysisType may not be a subclass of pass (for
- // AnalysisGroups), we must use dynamic_cast here to potentially adjust the
- // return pointer (because the class may multiply inherit, once from pass,
- // once from AnalysisType).
- //
- AnalysisType *Result = dynamic_cast<AnalysisType*>(ResultPass);
- assert(Result && "Pass does not implement interface required!");
- return *Result;
- }
+ AnalysisType &getAnalysis(Function &F); // Defined in PassanalysisSupport.h
-private:
- friend class PassManagerT<Module>;
- friend class PassManagerT<Function>;
- friend class PassManagerT<BasicBlock>;
- virtual void addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU);
+ template<typename AnalysisType>
+ AnalysisType &getAnalysisID(const PassInfo *PI) const;
+
+ template<typename AnalysisType>
+ AnalysisType &getAnalysisID(const PassInfo *PI, Function &F);
};
inline std::ostream &operator<<(std::ostream &OS, const Pass &P) {
P.print(OS, 0); return OS;
}
+//===----------------------------------------------------------------------===//
+/// 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:
+ /// runOnModule - Virtual method overriden by subclasses to process the module
+ /// being operated on.
+ virtual bool runOnModule(Module &M) = 0;
+
+ virtual bool runPass(Module &M) { return runOnModule(M); }
+ virtual bool runPass(BasicBlock&) { return false; }
+
+ virtual void assignPassManager(PMStack &PMS,
+ PassManagerType T = PMT_ModulePassManager);
+
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const {
+ return PMT_ModulePassManager;
+ }
+
+ explicit ModulePass(intptr_t pid) : Pass(pid) {}
+ // Force out-of-line virtual method.
+ virtual ~ModulePass();
+};
//===----------------------------------------------------------------------===//
/// not need to be run. This is useful for things like target information and
/// "basic" versions of AnalysisGroups.
///
-struct ImmutablePass : public Pass {
+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,
/// ImmutablePasses are never run.
///
- virtual bool run(Module &M) { return false; }
+ bool runOnModule(Module &M) { return false; }
-private:
- friend class PassManagerT<Module>;
- virtual void addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU);
+ explicit ImmutablePass(intptr_t pid) : ModulePass(pid) {}
+ // Force out-of-line virtual method.
+ virtual ~ImmutablePass();
};
-
//===----------------------------------------------------------------------===//
/// FunctionPass class - This class is used to implement most global
/// optimizations. Optimizations should subclass this class if they meet the
/// 2. Optimizing a function does not cause the addition or removal of any
/// functions in the module
///
-struct FunctionPass : public Pass {
+class FunctionPass : public Pass {
+public:
+ explicit FunctionPass(intptr_t pid) : Pass(pid) {}
+
/// doInitialization - Virtual method overridden by subclasses to do
- /// any neccesary per-module initialization.
+ /// any necessary per-module initialization.
///
virtual bool doInitialization(Module &M) { return false; }
///
virtual bool doFinalization(Module &M) { return false; }
- /// run - On a module, we run this pass by initializing, ronOnFunction'ing
- /// once for every function in the module, then by finalizing.
+ /// runOnModule - On a module, we run this pass by initializing,
+ /// ronOnFunction'ing once for every function in the module, then by
+ /// finalizing.
///
- virtual bool run(Module &M);
+ virtual bool runOnModule(Module &M);
/// run - On a function, we simply initialize, run the function, then
/// finalize.
///
bool run(Function &F);
-private:
- friend class PassManagerT<Module>;
- friend class PassManagerT<Function>;
- friend class PassManagerT<BasicBlock>;
- virtual void addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU);
- virtual void addToPassManager(PassManagerT<Function> *PM, AnalysisUsage &AU);
+ virtual void assignPassManager(PMStack &PMS,
+ PassManagerType T = PMT_FunctionPassManager);
+
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const {
+ return PMT_FunctionPassManager;
+ }
};
/// 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 FunctionPass's.
+/// 3. Optimizations conform to all of the constraints of FunctionPasses.
///
-struct BasicBlockPass : public FunctionPass {
+class BasicBlockPass : public Pass {
+public:
+ explicit BasicBlockPass(intptr_t pid) : Pass(pid) {}
+
/// doInitialization - Virtual method overridden by subclasses to do
- /// any neccesary per-module initialization.
+ /// any necessary per-module initialization.
///
virtual bool doInitialization(Module &M) { return false; }
/// doInitialization - Virtual method overridden by BasicBlockPass subclasses
- /// to do any neccesary per-function initialization.
+ /// to do any necessary per-function initialization.
///
virtual bool doInitialization(Function &F) { return false; }
/// To run directly on the basic block, we initialize, runOnBasicBlock, then
/// finalize.
///
- bool run(BasicBlock &BB);
+ virtual bool runPass(Module &M) { return false; }
+ virtual bool runPass(BasicBlock &BB);
+
+ virtual void assignPassManager(PMStack &PMS,
+ PassManagerType T = PMT_BasicBlockPassManager);
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const {
+ return PMT_BasicBlockPassManager;
+ }
+};
+
+/// PMStack
+/// Top level pass manager (see PasManager.cpp) maintains active Pass Managers
+/// using PMStack. Each Pass implements assignPassManager() to connect itself
+/// with appropriate manager. assignPassManager() walks PMStack to find
+/// suitable manager.
+///
+/// PMStack is just a wrapper around standard deque that overrides pop() and
+/// push() methods.
+class PMStack {
+public:
+ typedef std::deque<PMDataManager *>::reverse_iterator iterator;
+ iterator begin() { return S.rbegin(); }
+ iterator end() { return S.rend(); }
+
+ void handleLastUserOverflow();
+
+ void pop();
+ inline PMDataManager *top() { return S.back(); }
+ void push(Pass *P);
+ inline bool empty() { return S.empty(); }
+
+ void dump();
private:
- friend class PassManagerT<Function>;
- friend class PassManagerT<BasicBlock>;
- virtual void addToPassManager(PassManagerT<Function> *PM, AnalysisUsage &AU);
- virtual void addToPassManager(PassManagerT<BasicBlock> *PM,AnalysisUsage &AU);
+ std::deque<PMDataManager *> S;
};
+
+/// 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.
//