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//===- llvm/Analysis/SafePointerAccess.h - Check pointer safety ---*- C++ -*-=//
//
// This file defines a pass that can be used to determine, interprocedurally,
// which pointer types are accessed unsafely in a program. If there is an
// "unsafe" access to a specific pointer type, transformations that depend on
// type safety cannot be permitted.
//
// The result of running this analysis over a program is a set of unsafe pointer
// types that cannot be transformed. Safe pointer types are not tracked.
//
// Additionally, this analysis exports a hidden command line argument that (when
// enabled) prints out the reasons a type was determined to be unsafe. Just add
// -unsafeptrinst to the command line of the tool you want to get it.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_SAFEPOINTERACCESS_H
#define LLVM_ANALYSIS_SAFEPOINTERACCESS_H
#include "llvm/Pass.h"
#include <set>
class PointerType;
struct FindUnsafePointerTypes : public Pass {
// UnsafeTypes - Set of types that are not safe to transform.
std::set<PointerType*> UnsafeTypes;
public:
static AnalysisID ID; // We are an analysis, we must have an ID
FindUnsafePointerTypes(AnalysisID id) { assert(ID == id); }
// Accessor for underlying type set...
inline const std::set<PointerType*> &getUnsafeTypes() const {
return UnsafeTypes;
}
// run - Inspect the operations that the specified module does on
// values of various types. If they are deemed to be 'unsafe' note that the
// type is not safe to transform.
//
virtual bool run(Module *M);
// printResults - Loop over the results of the analysis, printing out unsafe
// types.
//
void printResults(const Module *Mod, std::ostream &o) const;
// getAnalysisUsageInfo - This function needs FindUsedTypes to do its job...
//
virtual void getAnalysisUsageInfo(Pass::AnalysisSet &Required,
Pass::AnalysisSet &Destroyed,
Pass::AnalysisSet &Provided);
};
#endif
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