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+//===- llvm/PassAnalysisSupport.h - Analysis Pass Support code --*- 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 stuff that is used to define and "use" Analysis Passes.
+// This file is automatically #included by Pass.h, so:
+//
+// NO .CPP FILES SHOULD INCLUDE THIS FILE DIRECTLY
+//
+// Instead, #include Pass.h
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_PASSANALYSISSUPPORT_H
+#define LLVM_PASSANALYSISSUPPORT_H
+
+#include "Pass.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include <cassert>
+#include <utility>
+#include <vector>
+
+namespace llvm {
+
+class Function;
+class Pass;
+class PMDataManager;
+
+//===----------------------------------------------------------------------===//
+/// Represent the analysis usage information of a pass. This 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:
+ using VectorType = SmallVectorImpl<AnalysisID>;
+
+private:
+ /// Sets of analyses required and preserved by a pass
+ // TODO: It's not clear that SmallVector is an appropriate data structure for
+ // this usecase. The sizes were picked to minimize wasted space, but are
+ // otherwise fairly meaningless.
+ SmallVector<AnalysisID, 8> Required;
+ SmallVector<AnalysisID, 2> RequiredTransitive;
+ SmallVector<AnalysisID, 2> Preserved;
+ SmallVector<AnalysisID, 0> Used;
+ bool PreservesAll = false;
+
+public:
+ AnalysisUsage() = default;
+
+ ///@{
+ /// Add the specified ID to the required set of the usage info for a pass.
+ AnalysisUsage &addRequiredID(const void *ID);
+ AnalysisUsage &addRequiredID(char &ID);
+ template<class PassClass>
+ AnalysisUsage &addRequired() {
+ return addRequiredID(PassClass::ID);
+ }
+
+ AnalysisUsage &addRequiredTransitiveID(char &ID);
+ template<class PassClass>
+ AnalysisUsage &addRequiredTransitive() {
+ return addRequiredTransitiveID(PassClass::ID);
+ }
+ ///@}
+
+ ///@{
+ /// Add the specified ID to the set of analyses preserved by this pass.
+ AnalysisUsage &addPreservedID(const void *ID) {
+ Preserved.push_back(ID);
+ return *this;
+ }
+ AnalysisUsage &addPreservedID(char &ID) {
+ Preserved.push_back(&ID);
+ return *this;
+ }
+ /// Add the specified Pass class to the set of analyses preserved by this pass.
+ template<class PassClass>
+ AnalysisUsage &addPreserved() {
+ Preserved.push_back(&PassClass::ID);
+ return *this;
+ }
+ ///@}
+
+ ///@{
+ /// Add the specified ID to the set of analyses used by this pass if they are
+ /// available..
+ AnalysisUsage &addUsedIfAvailableID(const void *ID) {
+ Used.push_back(ID);
+ return *this;
+ }
+ AnalysisUsage &addUsedIfAvailableID(char &ID) {
+ Used.push_back(&ID);
+ return *this;
+ }
+ /// Add the specified Pass class to the set of analyses used by this pass.
+ template<class PassClass>
+ AnalysisUsage &addUsedIfAvailable() {
+ Used.push_back(&PassClass::ID);
+ return *this;
+ }
+ ///@}
+
+ /// 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);
+
+ /// Set by analyses that do not transform their input at all
+ void setPreservesAll() { PreservesAll = true; }
+
+ /// Determine whether a pass said it does not transform its input at all
+ bool getPreservesAll() const { return PreservesAll; }
+
+ /// This function should be called by the pass, iff they do not:
+ ///
+ /// 1. Add or remove basic blocks from the function
+ /// 2. Modify terminator instructions in any way.
+ ///
+ /// This function annotates the AnalysisUsage info object to say that analyses
+ /// that only depend on the CFG are preserved by this pass.
+ void setPreservesCFG();
+
+ const VectorType &getRequiredSet() const { return Required; }
+ const VectorType &getRequiredTransitiveSet() const {
+ return RequiredTransitive;
+ }
+ const VectorType &getPreservedSet() const { return Preserved; }
+ const VectorType &getUsedSet() const { return Used; }
+};
+
+//===----------------------------------------------------------------------===//
+/// AnalysisResolver - Simple interface used by Pass objects to pull all
+/// analysis information out of pass manager that is responsible to manage
+/// the pass.
+///
+class AnalysisResolver {
+public:
+ AnalysisResolver() = delete;
+ explicit AnalysisResolver(PMDataManager &P) : PM(P) {}
+
+ PMDataManager &getPMDataManager() { return PM; }
+
+ /// Find pass that is implementing PI.
+ Pass *findImplPass(AnalysisID PI) {
+ Pass *ResultPass = nullptr;
+ for (const auto &AnalysisImpl : AnalysisImpls) {
+ if (AnalysisImpl.first == PI) {
+ ResultPass = AnalysisImpl.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);
+ }
+
+ /// Clear cache that is used to connect a pass to the analysis (PassInfo).
+ void clearAnalysisImpls() {
+ AnalysisImpls.clear();
+ }
+
+ /// Return analysis result or null if it doesn't exist.
+ Pass *getAnalysisIfAvailable(AnalysisID ID, bool Direction) const;
+
+private:
+ /// 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;
+
+ /// PassManager that is used to resolve analysis info
+ PMDataManager &PM;
+};
+
+/// 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::getAnalysisIfAvailable() const {
+ assert(Resolver && "Pass not resident in a PassManager object!");
+
+ 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 namespace llvm
+
+#endif // LLVM_PASSANALYSISSUPPORT_H