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378 lines
13 KiB
C++
378 lines
13 KiB
C++
//===- llvm/Analysis/AliasSetTracker.h - Build Alias Sets -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines two classes: AliasSetTracker and AliasSet. These interface
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// are used to classify a collection of pointer references into a maximal number
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// of disjoint sets. Each AliasSet object constructed by the AliasSetTracker
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// object refers to memory disjoint from the other sets.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_ALIASSETTRACKER_H
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#define LLVM_ANALYSIS_ALIASSETTRACKER_H
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#include "llvm/Support/CallSite.h"
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#include "llvm/ADT/iterator"
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#include "llvm/ADT/hash_map"
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#include "llvm/ADT/ilist"
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namespace llvm {
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class AliasAnalysis;
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class LoadInst;
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class StoreInst;
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class FreeInst;
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class AliasSetTracker;
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class AliasSet;
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class AliasSet {
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friend class AliasSetTracker;
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class PointerRec;
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typedef std::pair<Value* const, PointerRec> HashNodePair;
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class PointerRec {
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HashNodePair **PrevInList, *NextInList;
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AliasSet *AS;
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unsigned Size;
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public:
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PointerRec() : PrevInList(0), NextInList(0), AS(0), Size(0) {}
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HashNodePair *getNext() const { return NextInList; }
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bool hasAliasSet() const { return AS != 0; }
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HashNodePair** setPrevInList(HashNodePair **PIL) {
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PrevInList = PIL;
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return &NextInList;
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}
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void updateSize(unsigned NewSize) {
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if (NewSize > Size) Size = NewSize;
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}
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unsigned getSize() const { return Size; }
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AliasSet *getAliasSet(AliasSetTracker &AST) {
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assert(AS && "No AliasSet yet!");
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if (AS->Forward) {
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AliasSet *OldAS = AS;
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AS = OldAS->getForwardedTarget(AST);
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AS->addRef();
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OldAS->dropRef(AST);
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}
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return AS;
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}
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void setAliasSet(AliasSet *as) {
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assert(AS == 0 && "Already have an alias set!");
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AS = as;
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}
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void removeFromList() {
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if (NextInList) NextInList->second.PrevInList = PrevInList;
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*PrevInList = NextInList;
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if (AS->PtrListEnd == &NextInList) {
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AS->PtrListEnd = PrevInList;
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assert(*AS->PtrListEnd == 0 && "List not terminated right!");
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}
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}
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};
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HashNodePair *PtrList, **PtrListEnd; // Doubly linked list of nodes
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AliasSet *Forward; // Forwarding pointer
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AliasSet *Next, *Prev; // Doubly linked list of AliasSets
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std::vector<CallSite> CallSites; // All calls & invokes in this node
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// RefCount - Number of nodes pointing to this AliasSet plus the number of
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// AliasSets forwarding to it.
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unsigned RefCount : 28;
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/// AccessType - Keep track of whether this alias set merely refers to the
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/// locations of memory, whether it modifies the memory, or whether it does
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/// both. The lattice goes from "NoModRef" to either Refs or Mods, then to
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/// ModRef as necessary.
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///
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enum AccessType {
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NoModRef = 0, Refs = 1, // Ref = bit 1
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Mods = 2, ModRef = 3 // Mod = bit 2
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};
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unsigned AccessTy : 2;
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/// AliasType - Keep track the relationships between the pointers in the set.
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/// Lattice goes from MustAlias to MayAlias.
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///
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enum AliasType {
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MustAlias = 0, MayAlias = 1
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};
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unsigned AliasTy : 1;
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// Volatile - True if this alias set contains volatile loads or stores.
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bool Volatile : 1;
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friend struct ilist_traits<AliasSet>;
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AliasSet *getPrev() const { return Prev; }
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AliasSet *getNext() const { return Next; }
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void setPrev(AliasSet *P) { Prev = P; }
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void setNext(AliasSet *N) { Next = N; }
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void addRef() { ++RefCount; }
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void dropRef(AliasSetTracker &AST) {
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assert(RefCount >= 1 && "Invalid reference count detected!");
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if (--RefCount == 0)
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removeFromTracker(AST);
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}
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public:
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/// Accessors...
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bool isRef() const { return AccessTy & Refs; }
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bool isMod() const { return AccessTy & Mods; }
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bool isMustAlias() const { return AliasTy == MustAlias; }
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bool isMayAlias() const { return AliasTy == MayAlias; }
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// isVolatile - Return true if this alias set contains volatile loads or
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// stores.
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bool isVolatile() const { return Volatile; }
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/// isForwardingAliasSet - Return true if this alias set should be ignored as
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/// part of the AliasSetTracker object.
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bool isForwardingAliasSet() const { return Forward; }
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/// mergeSetIn - Merge the specified alias set into this alias set...
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///
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void mergeSetIn(AliasSet &AS, AliasSetTracker &AST);
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// Alias Set iteration - Allow access to all of the pointer which are part of
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// this alias set...
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class iterator;
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iterator begin() const { return iterator(PtrList); }
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iterator end() const { return iterator(); }
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bool empty() const { return PtrList == 0; }
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void print(std::ostream &OS) const;
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void dump() const;
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/// Define an iterator for alias sets... this is just a forward iterator.
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class iterator : public forward_iterator<HashNodePair, ptrdiff_t> {
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HashNodePair *CurNode;
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public:
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iterator(HashNodePair *CN = 0) : CurNode(CN) {}
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bool operator==(const iterator& x) const {
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return CurNode == x.CurNode;
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}
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bool operator!=(const iterator& x) const { return !operator==(x); }
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const iterator &operator=(const iterator &I) {
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CurNode = I.CurNode;
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return *this;
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}
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value_type &operator*() const {
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assert(CurNode && "Dereferencing AliasSet.end()!");
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return *CurNode;
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}
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value_type *operator->() const { return &operator*(); }
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Value *getPointer() const { return CurNode->first; }
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unsigned getSize() const { return CurNode->second.getSize(); }
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iterator& operator++() { // Preincrement
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assert(CurNode && "Advancing past AliasSet.end()!");
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CurNode = CurNode->second.getNext();
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return *this;
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}
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iterator operator++(int) { // Postincrement
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iterator tmp = *this; ++*this; return tmp;
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}
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};
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private:
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// Can only be created by AliasSetTracker
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AliasSet() : PtrList(0), PtrListEnd(&PtrList), Forward(0), RefCount(0),
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AccessTy(NoModRef), AliasTy(MustAlias), Volatile(false) {
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}
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AliasSet(const AliasSet &AS) {
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assert(0 && "Copy ctor called!?!?!");
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abort();
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}
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HashNodePair *getSomePointer() const {
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return PtrList;
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}
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/// getForwardedTarget - Return the real alias set this represents. If this
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/// has been merged with another set and is forwarding, return the ultimate
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/// destination set. This also implements the union-find collapsing as well.
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AliasSet *getForwardedTarget(AliasSetTracker &AST) {
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if (!Forward) return this;
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AliasSet *Dest = Forward->getForwardedTarget(AST);
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if (Dest != Forward) {
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Dest->addRef();
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Forward->dropRef(AST);
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Forward = Dest;
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}
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return Dest;
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}
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void removeFromTracker(AliasSetTracker &AST);
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void addPointer(AliasSetTracker &AST, HashNodePair &Entry, unsigned Size,
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bool KnownMustAlias = false);
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void addCallSite(CallSite CS, AliasAnalysis &AA);
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void setVolatile() { Volatile = true; }
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/// aliasesPointer - Return true if the specified pointer "may" (or must)
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/// alias one of the members in the set.
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///
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bool aliasesPointer(const Value *Ptr, unsigned Size, AliasAnalysis &AA) const;
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bool aliasesCallSite(CallSite CS, AliasAnalysis &AA) const;
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};
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inline std::ostream& operator<<(std::ostream &OS, const AliasSet &AS) {
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AS.print(OS);
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return OS;
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}
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class AliasSetTracker {
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AliasAnalysis &AA;
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ilist<AliasSet> AliasSets;
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// Map from pointers to their node
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hash_map<Value*, AliasSet::PointerRec> PointerMap;
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public:
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/// AliasSetTracker ctor - Create an empty collection of AliasSets, and use
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/// the specified alias analysis object to disambiguate load and store
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/// addresses.
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AliasSetTracker(AliasAnalysis &aa) : AA(aa) {}
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/// add methods - These methods are used to add different types of
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/// instructions to the alias sets. Adding a new instruction can result in
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/// one of three actions happening:
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///
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/// 1. If the instruction doesn't alias any other sets, create a new set.
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/// 2. If the instruction aliases exactly one set, add it to the set
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/// 3. If the instruction aliases multiple sets, merge the sets, and add
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/// the instruction to the result.
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///
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/// These methods return true if inserting the instruction resulted in the
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/// addition of a new alias set (i.e., the pointer did not alias anything).
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///
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bool add(Value *Ptr, unsigned Size); // Add a location
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bool add(LoadInst *LI);
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bool add(StoreInst *SI);
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bool add(FreeInst *FI);
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bool add(CallSite CS); // Call/Invoke instructions
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bool add(CallInst *CI) { return add(CallSite(CI)); }
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bool add(InvokeInst *II) { return add(CallSite(II)); }
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bool add(Instruction *I); // Dispatch to one of the other add methods...
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void add(BasicBlock &BB); // Add all instructions in basic block
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void add(const AliasSetTracker &AST); // Add alias relations from another AST
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/// remove methods - These methods are used to remove all entries that might
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/// be aliased by the specified instruction. These methods return true if any
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/// alias sets were eliminated.
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bool remove(Value *Ptr, unsigned Size); // Remove a location
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bool remove(LoadInst *LI);
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bool remove(StoreInst *SI);
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bool remove(FreeInst *FI);
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bool remove(CallSite CS);
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bool remove(CallInst *CI) { return remove(CallSite(CI)); }
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bool remove(InvokeInst *II) { return remove(CallSite(II)); }
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bool remove(Instruction *I);
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void remove(AliasSet &AS);
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/// getAliasSets - Return the alias sets that are active.
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///
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const ilist<AliasSet> &getAliasSets() const { return AliasSets; }
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/// getAliasSetForPointer - Return the alias set that the specified pointer
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/// lives in. If the New argument is non-null, this method sets the value to
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/// true if a new alias set is created to contain the pointer (because the
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/// pointer didn't alias anything).
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AliasSet &getAliasSetForPointer(Value *P, unsigned Size, bool *New = 0);
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/// getAliasSetForPointerIfExists - Return the alias set containing the
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/// location specified if one exists, otherwise return null.
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AliasSet *getAliasSetForPointerIfExists(Value *P, unsigned Size) {
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return findAliasSetForPointer(P, Size);
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}
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/// containsPointer - Return true if the specified location is represented by
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/// this alias set, false otherwise. This does not modify the AST object or
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/// alias sets.
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bool containsPointer(Value *P, unsigned Size) const;
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/// getAliasAnalysis - Return the underlying alias analysis object used by
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/// this tracker.
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AliasAnalysis &getAliasAnalysis() const { return AA; }
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/// deleteValue method - This method is used to remove a pointer value from
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/// the AliasSetTracker entirely. It should be used when an instruction is
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/// deleted from the program to update the AST. If you don't use this, you
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/// would have dangling pointers to deleted instructions.
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///
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void deleteValue(Value *PtrVal);
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/// copyValue - This method should be used whenever a preexisting value in the
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/// program is copied or cloned, introducing a new value. Note that it is ok
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/// for clients that use this method to introduce the same value multiple
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/// times: if the tracker already knows about a value, it will ignore the
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/// request.
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///
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void copyValue(Value *From, Value *To);
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typedef ilist<AliasSet>::iterator iterator;
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typedef ilist<AliasSet>::const_iterator const_iterator;
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const_iterator begin() const { return AliasSets.begin(); }
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const_iterator end() const { return AliasSets.end(); }
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iterator begin() { return AliasSets.begin(); }
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iterator end() { return AliasSets.end(); }
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void print(std::ostream &OS) const;
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void dump() const;
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private:
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friend class AliasSet;
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void removeAliasSet(AliasSet *AS);
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AliasSet::HashNodePair &getEntryFor(Value *V) {
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// Standard operator[], except that it returns the whole pair, not just
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// ->second.
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return *PointerMap.insert(AliasSet::HashNodePair(V,
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AliasSet::PointerRec())).first;
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}
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AliasSet &addPointer(Value *P, unsigned Size, AliasSet::AccessType E,
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bool &NewSet) {
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NewSet = false;
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AliasSet &AS = getAliasSetForPointer(P, Size, &NewSet);
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AS.AccessTy |= E;
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return AS;
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}
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AliasSet *findAliasSetForPointer(const Value *Ptr, unsigned Size);
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AliasSet *findAliasSetForCallSite(CallSite CS);
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};
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inline std::ostream& operator<<(std::ostream &OS, const AliasSetTracker &AST) {
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AST.print(OS);
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return OS;
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}
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} // End llvm namespace
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#endif
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