//===- llvm/PassAnalysisSupport.h - Analysis Pass Support code --*- 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file defines stuff that is used to define and "use" Analysis Passes.
//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_PASS_ANALYSIS_SUPPORT_H
-#define LLVM_PASS_ANALYSIS_SUPPORT_H
+#ifndef LLVM_PASSANALYSISSUPPORT_H
+#define LLVM_PASSANALYSISSUPPORT_H
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Pass.h"
+#include <vector>
-// No need to include Pass.h, we are being included by it!
+namespace llvm {
//===----------------------------------------------------------------------===//
// AnalysisUsage - Represent the analysis usage information of a pass. This
-// tracks analyses that the pass REQUIRES (must available when the pass runs),
-// and analyses that the pass PRESERVES (the pass does not invalidate the
+// tracks analyses that the pass REQUIRES (must be available when the pass
+// runs), REQUIRES TRANSITIVE (must be available throughout the lifetime of the
+// pass), and analyses that the pass PRESERVES (the pass does not invalidate the
// results of these analyses). This information is provided by a pass to the
// Pass infrastructure through the getAnalysisUsage virtual function.
//
class AnalysisUsage {
+public:
+ typedef SmallVector<AnalysisID, 32> VectorType;
+
+private:
// Sets of analyses required and preserved by a pass
- std::vector<AnalysisID> Required, Preserved;
+ VectorType Required, RequiredTransitive, Preserved;
bool PreservesAll;
+
public:
AnalysisUsage() : PreservesAll(false) {}
-
+
// addRequired - Add the specified ID to the required set of the usage info
// for a pass.
//
- AnalysisUsage &addRequiredID(AnalysisID ID) {
- Required.push_back(ID);
- return *this;
- }
+ AnalysisUsage &addRequiredID(const void *ID);
+ AnalysisUsage &addRequiredID(char &ID);
template<class PassClass>
AnalysisUsage &addRequired() {
- assert(Pass::getClassPassInfo<PassClass>() && "Pass class not registered!");
- Required.push_back(Pass::getClassPassInfo<PassClass>());
- return *this;
+ return addRequiredID(PassClass::ID);
+ }
+
+ AnalysisUsage &addRequiredTransitiveID(char &ID);
+ template<class PassClass>
+ AnalysisUsage &addRequiredTransitive() {
+ return addRequiredTransitiveID(PassClass::ID);
}
// addPreserved - Add the specified ID to the set of analyses preserved by
// this pass
//
- AnalysisUsage &addPreservedID(AnalysisID ID) {
+ AnalysisUsage &addPreservedID(const void *ID) {
Preserved.push_back(ID);
return *this;
}
+ AnalysisUsage &addPreservedID(char &ID) {
+ Preserved.push_back(&ID);
+ return *this;
+ }
+ // addPreserved - Add the specified Pass class to the set of analyses
+ // preserved by this pass.
+ //
template<class PassClass>
AnalysisUsage &addPreserved() {
- assert(Pass::getClassPassInfo<PassClass>() && "Pass class not registered!");
- Preserved.push_back(Pass::getClassPassInfo<PassClass>());
+ Preserved.push_back(&PassClass::ID);
return *this;
}
+ // addPreserved - Add the Pass with the specified argument string to the set
+ // of analyses preserved by this pass. If no such Pass exists, do nothing.
+ // This can be useful when a pass is trivially preserved, but may not be
+ // linked in. Be careful about spelling!
+ //
+ AnalysisUsage &addPreserved(StringRef Arg);
+
// setPreservesAll - Set by analyses that do not transform their input at all
void setPreservesAll() { PreservesAll = true; }
bool getPreservesAll() const { return PreservesAll; }
///
void setPreservesCFG();
- const std::vector<AnalysisID> &getRequiredSet() const { return Required; }
- const std::vector<AnalysisID> &getPreservedSet() const { return Preserved; }
+ const VectorType &getRequiredSet() const { return Required; }
+ const VectorType &getRequiredTransitiveSet() const {
+ return RequiredTransitive;
+ }
+ const VectorType &getPreservedSet() const { return Preserved; }
};
-
-
//===----------------------------------------------------------------------===//
-// AnalysisResolver - Simple interface implemented by PassManager objects that
-// is used to pull analysis information out of them.
+// AnalysisResolver - Simple interface used by Pass objects to pull all
+// analysis information out of pass manager that is responsible to manage
+// the pass.
//
-struct AnalysisResolver {
- virtual Pass *getAnalysisOrNullUp(AnalysisID ID) const = 0;
- virtual Pass *getAnalysisOrNullDown(AnalysisID ID) const = 0;
- virtual void addPass(ImmutablePass *IP, AnalysisUsage &AU) = 0;
- Pass *getAnalysis(AnalysisID ID) const {
- Pass *Result = getAnalysisOrNullUp(ID);
- assert(Result && "Pass has an incorrect analysis uses set!");
- return Result;
+class PMDataManager;
+class AnalysisResolver {
+private:
+ AnalysisResolver() LLVM_DELETED_FUNCTION;
+
+public:
+ explicit AnalysisResolver(PMDataManager &P) : PM(P) { }
+
+ inline PMDataManager &getPMDataManager() { return PM; }
+
+ // Find pass that is implementing PI.
+ Pass *findImplPass(AnalysisID PI) {
+ Pass *ResultPass = nullptr;
+ for (unsigned i = 0; i < AnalysisImpls.size() ; ++i) {
+ if (AnalysisImpls[i].first == PI) {
+ ResultPass = AnalysisImpls[i].second;
+ break;
+ }
+ }
+ return ResultPass;
+ }
+
+ // Find pass that is implementing PI. Initialize pass for Function F.
+ Pass *findImplPass(Pass *P, AnalysisID PI, Function &F);
+
+ void addAnalysisImplsPair(AnalysisID PI, Pass *P) {
+ if (findImplPass(PI) == P)
+ return;
+ std::pair<AnalysisID, Pass*> pir = std::make_pair(PI,P);
+ AnalysisImpls.push_back(pir);
}
- // getAnalysisToUpdate - Return an analysis result or null if it doesn't exist
- Pass *getAnalysisToUpdate(AnalysisID ID) const {
- return getAnalysisOrNullUp(ID);
+ /// clearAnalysisImpls - Clear cache that is used to connect a pass to the
+ /// the analysis (PassInfo).
+ void clearAnalysisImpls() {
+ AnalysisImpls.clear();
}
- // Methods for introspecting into pass manager objects...
- virtual unsigned getDepth() const = 0;
- virtual unsigned getNumContainedPasses() const = 0;
- virtual const Pass *getContainedPass(unsigned N) const = 0;
+ // getAnalysisIfAvailable - Return analysis result or null if it doesn't exist
+ Pass *getAnalysisIfAvailable(AnalysisID ID, bool Direction) const;
- virtual void markPassUsed(AnalysisID P, Pass *User) = 0;
+private:
+ // AnalysisImpls - This keeps track of which passes implements the interfaces
+ // that are required by the current pass (to implement getAnalysis()).
+ std::vector<std::pair<AnalysisID, Pass*> > AnalysisImpls;
- void startPass(Pass *P) {}
- void endPass(Pass *P) {}
-protected:
- void setAnalysisResolver(Pass *P, AnalysisResolver *AR);
+ // PassManager that is used to resolve analysis info
+ PMDataManager &PM;
};
-/// getAnalysisToUpdate<AnalysisType>() - This function is used by subclasses
-/// to get to the analysis information that might be around that needs to be
-/// updated. This is different than getAnalysis in that it can fail (ie the
-/// analysis results haven't been computed), so should only be used if you
-/// provide the capability to update an analysis that exists. This method is
-/// often used by transformation APIs to update analysis results for a pass
-/// automatically as the transform is performed.
+/// 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 *Pass::getAnalysisToUpdate() const {
+AnalysisType *Pass::getAnalysisIfAvailable() 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));
+
+ const void *PI = &AnalysisType::ID;
+
+ Pass *ResultPass = Resolver->getAnalysisIfAvailable(PI, true);
+ if (!ResultPass) return nullptr;
+
+ // Because the AnalysisType may not be a subclass of pass (for
+ // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
+ // adjust the return pointer (because the class may multiply inherit, once
+ // from pass, once from AnalysisType).
+ return (AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
+}
+
+/// 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 &Pass::getAnalysis() const {
+ assert(Resolver && "Pass has not been inserted into a PassManager object!");
+ return getAnalysisID<AnalysisType>(&AnalysisType::ID);
+}
+
+template<typename AnalysisType>
+AnalysisType &Pass::getAnalysisID(AnalysisID PI) const {
+ assert(PI && "getAnalysis for unregistered pass!");
+ assert(Resolver&&"Pass has not been inserted into a PassManager object!");
+ // 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 = Resolver->findImplPass(PI);
+ assert (ResultPass &&
+ "getAnalysis*() called on an analysis that was not "
+ "'required' by pass!");
+
+ // Because the AnalysisType may not be a subclass of pass (for
+ // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
+ // adjust the return pointer (because the class may multiply inherit, once
+ // from pass, once from AnalysisType).
+ return *(AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
+}
+
+/// 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 &Pass::getAnalysis(Function &F) {
+ assert(Resolver &&"Pass has not been inserted into a PassManager object!");
+
+ return getAnalysisID<AnalysisType>(&AnalysisType::ID, F);
+}
+
+template<typename AnalysisType>
+AnalysisType &Pass::getAnalysisID(AnalysisID PI, Function &F) {
+ assert(PI && "getAnalysis for unregistered pass!");
+ assert(Resolver && "Pass has not been inserted into a PassManager object!");
+ // 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 = Resolver->findImplPass(this, PI, F);
+ assert(ResultPass && "Unable to find requested analysis info");
+
+ // Because the AnalysisType may not be a subclass of pass (for
+ // AnalysisGroups), we use getAdjustedAnalysisPointer here to potentially
+ // adjust the return pointer (because the class may multiply inherit, once
+ // from pass, once from AnalysisType).
+ return *(AnalysisType*)ResultPass->getAdjustedAnalysisPointer(PI);
}
+} // End llvm namespace
+
#endif
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