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//===- llvm/PassAnalysisSupport.h - Analysis Pass Support code ---*- C++ -*-==//
//
// 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_PASS_ANALYSIS_SUPPORT_H
#define LLVM_PASS_ANALYSIS_SUPPORT_H
// No need to include Pass.h, we are being included by it!
//===----------------------------------------------------------------------===//
// 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
// results of these analyses). This information is provided by a pass to the
// Pass infrastructure through the getAnalysisUsage virtual function.
//
class AnalysisUsage {
// Sets of analyses required and preserved by a pass
std::vector<AnalysisID> Required, 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;
}
template<class PassClass>
AnalysisUsage &addRequired() {
assert(Pass::getClassPassInfo<PassClass>() && "Pass class not registered!");
Required.push_back(Pass::getClassPassInfo<PassClass>());
return *this;
}
// addPreserved - Add the specified ID to the set of analyses preserved by
// this pass
//
AnalysisUsage &addPreservedID(AnalysisID ID) {
Preserved.push_back(ID);
return *this;
}
template<class PassClass>
AnalysisUsage &addPreserved() {
assert(Pass::getClassPassInfo<PassClass>() && "Pass class not registered!");
Preserved.push_back(Pass::getClassPassInfo<PassClass>());
return *this;
}
// setPreservesAll - Set by analyses that do not transform their input at all
void setPreservesAll() { PreservesAll = true; }
bool getPreservesAll() const { return PreservesAll; }
/// setPreservesCFG - 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 std::vector<AnalysisID> &getRequiredSet() const { return Required; }
const std::vector<AnalysisID> &getPreservedSet() const { return Preserved; }
};
//===----------------------------------------------------------------------===//
// AnalysisResolver - Simple interface implemented by PassManager objects that
// is used to pull analysis information out of them.
//
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;
}
// getAnalysisToUpdate - Return an analysis result or null if it doesn't exist
Pass *getAnalysisToUpdate(AnalysisID ID) const {
return getAnalysisOrNullUp(ID);
}
// 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;
virtual void markPassUsed(AnalysisID P, Pass *User) = 0;
void startPass(Pass *P) {}
void endPass(Pass *P) {}
protected:
void setAnalysisResolver(Pass *P, AnalysisResolver *AR);
};
/// 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.
///
template<typename AnalysisType>
AnalysisType *Pass::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));
}
#endif
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