X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=include%2Fllvm%2FAnalysis%2FAliasAnalysis.h;h=3aaec851c9fceb1e4e3a1f65d1494f494755b61d;hp=12840b33a8fff8a0088628961cffa87c93689416;hb=2c7c54c86c0619a0d3b9e22a6990b075fd174529;hpb=17e8078ae14ed71f657d59c77efa3bedf171161a diff --git a/include/llvm/Analysis/AliasAnalysis.h b/include/llvm/Analysis/AliasAnalysis.h index 12840b33a8f..3aaec851c9f 100644 --- a/include/llvm/Analysis/AliasAnalysis.h +++ b/include/llvm/Analysis/AliasAnalysis.h @@ -16,32 +16,48 @@ // which automatically provides functionality for the entire suite of client // APIs. // -// This API represents memory as a (Pointer, Size) pair. The Pointer component -// specifies the base memory address of the region, the Size specifies how large -// of an area is being queried, or UnknownSize if the size is not known. -// Pointers that point to two completely different objects in memory never -// alias, regardless of the value of the Size component. +// This API identifies memory regions with the Location class. The pointer +// component specifies the base memory address of the region. The Size specifies +// the maximum size (in address units) of the memory region, or UnknownSize if +// the size is not known. The TBAA tag identifies the "type" of the memory +// reference; see the TypeBasedAliasAnalysis class for details. +// +// Some non-obvious details include: +// - Pointers that point to two completely different objects in memory never +// alias, regardless of the value of the Size component. +// - NoAlias doesn't imply inequal pointers. The most obvious example of this +// is two pointers to constant memory. Even if they are equal, constant +// memory is never stored to, so there will never be any dependencies. +// In this and other situations, the pointers may be both NoAlias and +// MustAlias at the same time. The current API can only return one result, +// though this is rarely a problem in practice. // //===----------------------------------------------------------------------===// -#ifndef LLVM_ANALYSIS_ALIAS_ANALYSIS_H -#define LLVM_ANALYSIS_ALIAS_ANALYSIS_H +#ifndef LLVM_ANALYSIS_ALIASANALYSIS_H +#define LLVM_ANALYSIS_ALIASANALYSIS_H -#include "llvm/Support/CallSite.h" -#include +#include "llvm/ADT/DenseMap.h" +#include "llvm/IR/CallSite.h" +#include "llvm/IR/Metadata.h" namespace llvm { class LoadInst; class StoreInst; class VAArgInst; -class TargetData; +class DataLayout; +class TargetLibraryInfo; class Pass; class AnalysisUsage; +class MemTransferInst; +class MemIntrinsic; +class DominatorTree; class AliasAnalysis { protected: - const TargetData *TD; + const DataLayout *DL; + const TargetLibraryInfo *TLI; private: AliasAnalysis *AA; // Previous Alias Analysis to chain to. @@ -60,7 +76,7 @@ protected: public: static char ID; // Class identification, replacement for typeinfo - AliasAnalysis() : TD(0), AA(0) {} + AliasAnalysis() : DL(nullptr), TLI(nullptr), AA(nullptr) {} virtual ~AliasAnalysis(); // We want to be subclassed /// UnknownSize - This is a special value which can be used with the @@ -68,15 +84,20 @@ public: /// know the sizes of the potential memory references. static uint64_t const UnknownSize = ~UINT64_C(0); - /// getTargetData - Return a pointer to the current TargetData object, or - /// null if no TargetData object is available. + /// getDataLayout - Return a pointer to the current DataLayout object, or + /// null if no DataLayout object is available. + /// + const DataLayout *getDataLayout() const { return DL; } + + /// getTargetLibraryInfo - Return a pointer to the current TargetLibraryInfo + /// object, or null if no TargetLibraryInfo object is available. /// - const TargetData *getTargetData() const { return TD; } + const TargetLibraryInfo *getTargetLibraryInfo() const { return TLI; } - /// getTypeStoreSize - Return the TargetData store size for the given type, + /// getTypeStoreSize - Return the DataLayout store size for the given type, /// if known, or a conservative value otherwise. /// - uint64_t getTypeStoreSize(const Type *Ty); + uint64_t getTypeStoreSize(Type *Ty); //===--------------------------------------------------------------------===// /// Alias Queries... @@ -86,20 +107,20 @@ public: struct Location { /// Ptr - The address of the start of the location. const Value *Ptr; - /// Size - The maximum size of the location, or UnknownSize if the size is - /// not known. Note that an unknown size does not mean the pointer aliases - /// the entire virtual address space, because there are restrictions on - /// stepping out of one object and into another. + /// Size - The maximum size of the location, in address-units, or + /// UnknownSize if the size is not known. Note that an unknown size does + /// not mean the pointer aliases the entire virtual address space, because + /// there are restrictions on stepping out of one object and into another. /// See http://llvm.org/docs/LangRef.html#pointeraliasing uint64_t Size; - /// TBAATag - The metadata node which describes the TBAA type of - /// the location, or null if there is no known unique tag. - const MDNode *TBAATag; + /// AATags - The metadata nodes which describes the aliasing of the + /// location (each member is null if that kind of information is + /// unavailable).. + AAMDNodes AATags; - explicit Location(const Value *P = 0, - uint64_t S = UnknownSize, - const MDNode *N = 0) - : Ptr(P), Size(S), TBAATag(N) {} + explicit Location(const Value *P = nullptr, uint64_t S = UnknownSize, + const AAMDNodes &N = AAMDNodes()) + : Ptr(P), Size(S), AATags(N) {} Location getWithNewPtr(const Value *NewPtr) const { Location Copy(*this); @@ -113,13 +134,23 @@ public: return Copy; } - Location getWithoutTBAATag() const { + Location getWithoutAATags() const { Location Copy(*this); - Copy.TBAATag = 0; + Copy.AATags = AAMDNodes(); return Copy; } }; + /// getLocation - Fill in Loc with information about the memory reference by + /// the given instruction. + Location getLocation(const LoadInst *LI); + Location getLocation(const StoreInst *SI); + Location getLocation(const VAArgInst *VI); + Location getLocation(const AtomicCmpXchgInst *CXI); + Location getLocation(const AtomicRMWInst *RMWI); + static Location getLocationForSource(const MemTransferInst *MTI); + static Location getLocationForDest(const MemIntrinsic *MI); + /// Alias analysis result - Either we know for sure that it does not alias, we /// know for sure it must alias, or we don't know anything: The two pointers /// _might_ alias. This enum is designed so you can do things like: @@ -131,8 +162,9 @@ public: /// enum AliasResult { NoAlias = 0, ///< No dependencies. - MayAlias = 1, ///< Anything goes. - MustAlias = 2 ///< Pointers are equal. + MayAlias, ///< Anything goes. + PartialAlias, ///< Pointers differ, but pointees overlap. + MustAlias ///< Pointers are equal. }; /// alias - The main low level interface to the alias analysis implementation. @@ -163,7 +195,22 @@ public: const Value *V2, uint64_t V2Size) { return isNoAlias(Location(V1, V1Size), Location(V2, V2Size)); } + + /// isNoAlias - A convenience wrapper. + bool isNoAlias(const Value *V1, const Value *V2) { + return isNoAlias(Location(V1), Location(V2)); + } + + /// isMustAlias - A convenience wrapper. + bool isMustAlias(const Location &LocA, const Location &LocB) { + return alias(LocA, LocB) == MustAlias; + } + /// isMustAlias - A convenience wrapper. + bool isMustAlias(const Value *V1, const Value *V2) { + return alias(V1, 1, V2, 1) == MustAlias; + } + /// pointsToConstantMemory - If the specified memory location is /// known to be constant, return true. If OrLocal is true and the /// specified memory location is known to be "local" (derived from @@ -229,6 +276,14 @@ public: UnknownModRefBehavior = Anywhere | ModRef }; + /// Get the location associated with a pointer argument of a callsite. + /// The mask bits are set to indicate the allowed aliasing ModRef kinds. + /// Note that these mask bits do not necessarily account for the overall + /// behavior of the function, but rather only provide additional + /// per-argument information. + virtual Location getArgLocation(ImmutableCallSite CS, unsigned ArgIdx, + ModRefResult &Mask); + /// getModRefBehavior - Return the behavior when calling the given call site. virtual ModRefBehavior getModRefBehavior(ImmutableCallSite CS); @@ -295,7 +350,7 @@ public: } /// doesAccessArgPointees - Return true if functions with the specified - /// behavior are known to potentially read or write from objects pointed + /// behavior are known to potentially read or write from objects pointed /// to be their pointer-typed arguments (with arbitrary offsets). /// static bool doesAccessArgPointees(ModRefBehavior MRB) { @@ -311,6 +366,11 @@ public: case Instruction::VAArg: return getModRefInfo((const VAArgInst*)I, Loc); case Instruction::Load: return getModRefInfo((const LoadInst*)I, Loc); case Instruction::Store: return getModRefInfo((const StoreInst*)I, Loc); + case Instruction::Fence: return getModRefInfo((const FenceInst*)I, Loc); + case Instruction::AtomicCmpXchg: + return getModRefInfo((const AtomicCmpXchgInst*)I, Loc); + case Instruction::AtomicRMW: + return getModRefInfo((const AtomicRMWInst*)I, Loc); case Instruction::Call: return getModRefInfo((const CallInst*)I, Loc); case Instruction::Invoke: return getModRefInfo((const InvokeInst*)I,Loc); default: return NoModRef; @@ -323,7 +383,7 @@ public: return getModRefInfo(I, Location(P, Size)); } - /// getModRefInfo (for call sites) - Return whether information about whether + /// getModRefInfo (for call sites) - Return information about whether /// a particular call site modifies or reads the specified memory location. virtual ModRefResult getModRefInfo(ImmutableCallSite CS, const Location &Loc); @@ -334,7 +394,7 @@ public: return getModRefInfo(CS, Location(P, Size)); } - /// getModRefInfo (for calls) - Return whether information about whether + /// getModRefInfo (for calls) - Return information about whether /// a particular call modifies or reads the specified memory location. ModRefResult getModRefInfo(const CallInst *C, const Location &Loc) { return getModRefInfo(ImmutableCallSite(C), Loc); @@ -345,7 +405,7 @@ public: return getModRefInfo(C, Location(P, Size)); } - /// getModRefInfo (for invokes) - Return whether information about whether + /// getModRefInfo (for invokes) - Return information about whether /// a particular invoke modifies or reads the specified memory location. ModRefResult getModRefInfo(const InvokeInst *I, const Location &Loc) { @@ -358,7 +418,7 @@ public: return getModRefInfo(I, Location(P, Size)); } - /// getModRefInfo (for loads) - Return whether information about whether + /// getModRefInfo (for loads) - Return information about whether /// a particular load modifies or reads the specified memory location. ModRefResult getModRefInfo(const LoadInst *L, const Location &Loc); @@ -367,21 +427,54 @@ public: return getModRefInfo(L, Location(P, Size)); } - /// getModRefInfo (for stores) - Return whether information about whether + /// getModRefInfo (for stores) - Return information about whether /// a particular store modifies or reads the specified memory location. ModRefResult getModRefInfo(const StoreInst *S, const Location &Loc); /// getModRefInfo (for stores) - A convenience wrapper. - ModRefResult getModRefInfo(const StoreInst *S, const Value *P, uint64_t Size) { + ModRefResult getModRefInfo(const StoreInst *S, const Value *P, uint64_t Size){ return getModRefInfo(S, Location(P, Size)); } - /// getModRefInfo (for va_args) - Return whether information about whether + /// getModRefInfo (for fences) - Return information about whether + /// a particular store modifies or reads the specified memory location. + ModRefResult getModRefInfo(const FenceInst *S, const Location &Loc) { + // Conservatively correct. (We could possibly be a bit smarter if + // Loc is a alloca that doesn't escape.) + return ModRef; + } + + /// getModRefInfo (for fences) - A convenience wrapper. + ModRefResult getModRefInfo(const FenceInst *S, const Value *P, uint64_t Size){ + return getModRefInfo(S, Location(P, Size)); + } + + /// getModRefInfo (for cmpxchges) - Return information about whether + /// a particular cmpxchg modifies or reads the specified memory location. + ModRefResult getModRefInfo(const AtomicCmpXchgInst *CX, const Location &Loc); + + /// getModRefInfo (for cmpxchges) - A convenience wrapper. + ModRefResult getModRefInfo(const AtomicCmpXchgInst *CX, + const Value *P, unsigned Size) { + return getModRefInfo(CX, Location(P, Size)); + } + + /// getModRefInfo (for atomicrmws) - Return information about whether + /// a particular atomicrmw modifies or reads the specified memory location. + ModRefResult getModRefInfo(const AtomicRMWInst *RMW, const Location &Loc); + + /// getModRefInfo (for atomicrmws) - A convenience wrapper. + ModRefResult getModRefInfo(const AtomicRMWInst *RMW, + const Value *P, unsigned Size) { + return getModRefInfo(RMW, Location(P, Size)); + } + + /// getModRefInfo (for va_args) - Return information about whether /// a particular va_arg modifies or reads the specified memory location. ModRefResult getModRefInfo(const VAArgInst* I, const Location &Loc); /// getModRefInfo (for va_args) - A convenience wrapper. - ModRefResult getModRefInfo(const VAArgInst* I, const Value* P, uint64_t Size) { + ModRefResult getModRefInfo(const VAArgInst* I, const Value* P, uint64_t Size){ return getModRefInfo(I, Location(P, Size)); } @@ -392,6 +485,18 @@ public: virtual ModRefResult getModRefInfo(ImmutableCallSite CS1, ImmutableCallSite CS2); + /// callCapturesBefore - Return information about whether a particular call + /// site modifies or reads the specified memory location. + ModRefResult callCapturesBefore(const Instruction *I, + const AliasAnalysis::Location &MemLoc, + DominatorTree *DT); + + /// callCapturesBefore - A convenience wrapper. + ModRefResult callCapturesBefore(const Instruction *I, const Value *P, + uint64_t Size, DominatorTree *DT) { + return callCapturesBefore(I, Location(P, Size), DT); + } + //===--------------------------------------------------------------------===// /// Higher level methods for querying mod/ref information. /// @@ -439,6 +544,17 @@ public: /// virtual void copyValue(Value *From, Value *To); + /// addEscapingUse - This method should be used whenever an escaping use is + /// added to a pointer value. Analysis implementations may either return + /// conservative responses for that value in the future, or may recompute + /// some or all internal state to continue providing precise responses. + /// + /// Escaping uses are considered by anything _except_ the following: + /// - GEPs or bitcasts of the pointer + /// - Loads through the pointer + /// - Stores through (but not of) the pointer + virtual void addEscapingUse(Use &U); + /// replaceWithNewValue - This method is the obvious combination of the two /// above, and it provided as a helper to simplify client code. /// @@ -448,19 +564,56 @@ public: } }; +// Specialize DenseMapInfo for Location. +template<> +struct DenseMapInfo { + static inline AliasAnalysis::Location getEmptyKey() { + return + AliasAnalysis::Location(DenseMapInfo::getEmptyKey(), + 0, nullptr); + } + static inline AliasAnalysis::Location getTombstoneKey() { + return + AliasAnalysis::Location(DenseMapInfo::getTombstoneKey(), + 0, nullptr); + } + static unsigned getHashValue(const AliasAnalysis::Location &Val) { + return DenseMapInfo::getHashValue(Val.Ptr) ^ + DenseMapInfo::getHashValue(Val.Size) ^ + DenseMapInfo::getHashValue(Val.AATags); + } + static bool isEqual(const AliasAnalysis::Location &LHS, + const AliasAnalysis::Location &RHS) { + return LHS.Ptr == RHS.Ptr && + LHS.Size == RHS.Size && + LHS.AATags == RHS.AATags; + } +}; + /// isNoAliasCall - Return true if this pointer is returned by a noalias /// function. bool isNoAliasCall(const Value *V); +/// isNoAliasArgument - Return true if this is an argument with the noalias +/// attribute. +bool isNoAliasArgument(const Value *V); + /// isIdentifiedObject - Return true if this pointer refers to a distinct and /// identifiable object. This returns true for: /// Global Variables and Functions (but not Global Aliases) -/// Allocas and Mallocs +/// Allocas /// ByVal and NoAlias Arguments -/// NoAlias returns +/// NoAlias returns (e.g. calls to malloc) /// bool isIdentifiedObject(const Value *V); +/// isIdentifiedFunctionLocal - Return true if V is umabigously identified +/// at the function-level. Different IdentifiedFunctionLocals can't alias. +/// Further, an IdentifiedFunctionLocal can not alias with any function +/// arguments other than itself, which is not necessarily true for +/// IdentifiedObjects. +bool isIdentifiedFunctionLocal(const Value *V); + } // End llvm namespace #endif