AliasSetTracker.h revision 2cffeec014537a5f4d2313a5c21c3aa6fcf33288
1009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner//===- llvm/Analysis/AliasSetTracker.h - Build Alias Sets -------*- C++ -*-===// 26fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// 36fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// The LLVM Compiler Infrastructure 46fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// 56fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// This file was developed by the LLVM research group and is distributed under 66fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// the University of Illinois Open Source License. See LICENSE.TXT for details. 76fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// 86fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell//===----------------------------------------------------------------------===// 9009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner// 10009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner// This file defines two classes: AliasSetTracker and AliasSet. These interface 11009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner// are used to classify a collection of pointer references into a maximal number 12009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner// of disjoint sets. Each AliasSet object constructed by the AliasSetTracker 13009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner// object refers to memory disjoint from the other sets. 14009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner// 15009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner//===----------------------------------------------------------------------===// 16009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 17009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner#ifndef LLVM_ANALYSIS_ALIASSETTRACKER_H 18009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner#define LLVM_ANALYSIS_ALIASSETTRACKER_H 19009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 209971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner#include "llvm/Support/CallSite.h" 219971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner#include "Support/iterator" 229971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner#include "Support/hash_map" 239971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner#include "Support/ilist" 24d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 25d0fde30ce850b78371fd1386338350591f9ff494Brian Gaekenamespace llvm { 26d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 27009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerclass AliasAnalysis; 28009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerclass LoadInst; 29009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerclass StoreInst; 30009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerclass AliasSetTracker; 319971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattnerclass AliasSet; 32009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 33009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerclass AliasSet { 34009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner friend class AliasSetTracker; 359971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 369971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner struct PointerRec; 379971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner typedef std::pair<Value* const, PointerRec> HashNodePair; 389971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 399971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner class PointerRec { 402cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner HashNodePair **PrevInList, *NextInList; 419971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet *AS; 4231a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner unsigned Size; 439971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner public: 442cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner PointerRec() : PrevInList(0), NextInList(0), AS(0), Size(0) {} 459971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 469971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner HashNodePair *getNext() const { return NextInList; } 479971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner bool hasAliasSet() const { return AS != 0; } 489971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 492cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner HashNodePair** setPrevInList(HashNodePair **PIL) { 502cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner PrevInList = PIL; 512cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner return &NextInList; 522cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner } 532cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner 5431a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner void updateSize(unsigned NewSize) { 5531a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner if (NewSize > Size) Size = NewSize; 5631a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner } 5731a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner 5831a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner unsigned getSize() const { return Size; } 5931a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner 609971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet *getAliasSet(AliasSetTracker &AST) { 619971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner assert(AS && "No AliasSet yet!"); 629971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner if (AS->Forward) { 639971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet *OldAS = AS; 649971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AS = OldAS->getForwardedTarget(AST); 659971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner if (--OldAS->RefCount == 0) 669971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner OldAS->removeFromTracker(AST); 679971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AS->RefCount++; 689971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 699971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner return AS; 709971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 719971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 729971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner void setAliasSet(AliasSet *as) { 739971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner assert(AS == 0 && "Already have an alias set!"); 749971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AS = as; 759971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 762cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner 772cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner void removeFromList() { 782cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner if (NextInList) NextInList->second.PrevInList = PrevInList; 792cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner *PrevInList = NextInList; 809971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 819971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner }; 829971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 832cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner HashNodePair *PtrList, **PtrListEnd; // Doubly linked list of nodes 849971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet *Forward; // Forwarding pointer 859971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet *Next, *Prev; // Doubly linked list of AliasSets 869971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 879971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner std::vector<CallSite> CallSites; // All calls & invokes in this node 889971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 899971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner // RefCount - Number of nodes pointing to this AliasSet plus the number of 909971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner // AliasSets forwarding to it. 91bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner unsigned RefCount : 28; 929971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 93009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// AccessType - Keep track of whether this alias set merely refers to the 94009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// locations of memory, whether it modifies the memory, or whether it does 959971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// both. The lattice goes from "NoModRef" to either Refs or Mods, then to 965560c9d49ccae132cabf1155f18aa0480dce3edaMisha Brukman /// ModRef as necessary. 97009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// 98009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner enum AccessType { 999971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner NoModRef = 0, Refs = 1, // Ref = bit 1 1009971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner Mods = 2, ModRef = 3 // Mod = bit 2 101009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner }; 1029971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner unsigned AccessTy : 2; 103009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 104009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// AliasType - Keep track the relationships between the pointers in the set. 105009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// Lattice goes from MustAlias to MayAlias. 106009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// 107009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner enum AliasType { 1089971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner MustAlias = 0, MayAlias = 1 109009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner }; 1109971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner unsigned AliasTy : 1; 111009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 112bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner // Volatile - True if this alias set contains volatile loads or stores. 113bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner bool Volatile : 1; 114bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner 115b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner friend class ilist_traits<AliasSet>; 116b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner AliasSet *getPrev() const { return Prev; } 117b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner AliasSet *getNext() const { return Next; } 118b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void setPrev(AliasSet *P) { Prev = P; } 119b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void setNext(AliasSet *N) { Next = N; } 120b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner 121b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattnerpublic: 122b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner /// Accessors... 123b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner bool isRef() const { return AccessTy & Refs; } 124b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner bool isMod() const { return AccessTy & Mods; } 125b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner bool isMustAlias() const { return AliasTy == MustAlias; } 126b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner bool isMayAlias() const { return AliasTy == MayAlias; } 127b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner 128bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner // isVolatile - Return true if this alias set contains volatile loads or 129bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner // stores. 130bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner bool isVolatile() const { return Volatile; } 131bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner 132bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner 133b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner /// isForwardingAliasSet - Return true if this alias set should be ignored as 134b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner /// part of the AliasSetTracker object. 135b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner bool isForwardingAliasSet() const { return Forward; } 136b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner 137b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner /// mergeSetIn - Merge the specified alias set into this alias set... 138b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner /// 139b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void mergeSetIn(AliasSet &AS); 140b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner 141b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner // Alias Set iteration - Allow access to all of the pointer which are part of 142b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner // this alias set... 143b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner class iterator; 1442cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner iterator begin() const { return iterator(PtrList); } 145b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner iterator end() const { return iterator(); } 146b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner 147b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void print(std::ostream &OS) const; 148b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void dump() const; 149b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner 1509971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// Define an iterator for alias sets... this is just a forward iterator. 15131a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner class iterator : public forward_iterator<HashNodePair, ptrdiff_t> { 1529971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner HashNodePair *CurNode; 1539971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner public: 1549971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner iterator(HashNodePair *CN = 0) : CurNode(CN) {} 1559971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 1569971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner bool operator==(const iterator& x) const { 1579971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner return CurNode == x.CurNode; 1589971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 1599971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner bool operator!=(const iterator& x) const { return !operator==(x); } 160009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 1619971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner const iterator &operator=(const iterator &I) { 1629971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner CurNode = I.CurNode; 1639971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner return *this; 1649971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 1659971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 16631a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner value_type &operator*() const { 1679971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner assert(CurNode && "Dereferencing AliasSet.end()!"); 16831a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner return *CurNode; 1699971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 17031a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner value_type *operator->() const { return &operator*(); } 1719971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 1729971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner iterator& operator++() { // Preincrement 1739971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner assert(CurNode && "Advancing past AliasSet.end()!"); 1749971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner CurNode = CurNode->second.getNext(); 1759971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner return *this; 1769971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 1779971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner iterator operator++(int) { // Postincrement 1789971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner iterator tmp = *this; ++*this; return tmp; 1799971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 1809971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner }; 1819971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 182009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerprivate: 1839971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner // Can only be created by AliasSetTracker 1842cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner AliasSet() : PtrList(0), PtrListEnd(&PtrList), Forward(0), RefCount(0), 185bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner AccessTy(NoModRef), AliasTy(MustAlias), Volatile(false) { 1869971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 1872cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner AliasSet(const AliasSet &AS) { 1882cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner // AliasSet's only get copy constructed in simple circumstances. In 1892cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner // particular, they cannot have any pointers in their list. Despite this, 1902cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner // we have to be sure to update the PtrListEnd to not point to the source 1912cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner // AliasSet's list. 1922cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner assert(AS.PtrList == 0 && "AliasSet has pointers in it!"); 1932cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner PtrList = 0; PtrListEnd = &PtrList; 1942cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner Forward = AS.Forward; RefCount = AS.RefCount; 1952cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner AccessTy = AS.AccessTy; AliasTy = AS.AliasTy; Volatile = AS.Volatile; 1962cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner } 1972cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner 19831a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner HashNodePair *getSomePointer() const { 1992cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner return PtrList; 2009971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 2019971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2029971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// getForwardedTarget - Return the real alias set this represents. If this 2039971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// has been merged with another set and is forwarding, return the ultimate 2049971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// destination set. This also implements the union-find collapsing as well. 2059971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet *getForwardedTarget(AliasSetTracker &AST) { 2069971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner if (!Forward) return this; 2079971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2089971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet *Dest = Forward->getForwardedTarget(AST); 2099971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner if (Dest != Forward) { 2109971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner Dest->RefCount++; 2119971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner if (--Forward->RefCount == 0) 2129971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner Forward->removeFromTracker(AST); 2139971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner Forward = Dest; 2149971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 2159971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner return Dest; 2169971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 2179971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2189971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner void removeFromTracker(AliasSetTracker &AST); 2199971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 22031a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner void addPointer(AliasSetTracker &AST, HashNodePair &Entry, unsigned Size); 2219971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner void addCallSite(CallSite CS); 222bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner void setVolatile() { Volatile = true; } 2239971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2249971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// aliasesPointer - Return true if the specified pointer "may" (or must) 2259971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// alias one of the members in the set. 2269971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// 22731a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner bool aliasesPointer(const Value *Ptr, unsigned Size, AliasAnalysis &AA) const; 2289971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner bool aliasesCallSite(CallSite CS, AliasAnalysis &AA) const; 229009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner}; 230009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 2319971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattnerinline std::ostream& operator<<(std::ostream &OS, const AliasSet &AS) { 2329971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AS.print(OS); 2339971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner return OS; 2349971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner} 2359971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 236009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 237009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerclass AliasSetTracker { 238009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner AliasAnalysis &AA; 2399971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner ilist<AliasSet> AliasSets; 2409971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2419971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner // Map from pointers to their node 2429971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner hash_map<Value*, AliasSet::PointerRec> PointerMap; 243009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerpublic: 244009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// AliasSetTracker ctor - Create an empty collection of AliasSets, and use 245009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// the specified alias analysis object to disambiguate load and store 246009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// addresses. 247009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner AliasSetTracker(AliasAnalysis &aa) : AA(aa) {} 248009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 249009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// add methods - These methods are used to add different types of 250009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// instructions to the alias sets. Adding a new instruction can result in 251009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// one of three actions happening: 252009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// 253009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// 1. If the instruction doesn't alias any other sets, create a new set. 254009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// 2. If the instruction aliases exactly one set, add it to the set 255009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// 3. If the instruction aliases multiple sets, merge the sets, and add 256009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// the instruction to the result. 257009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// 258009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner void add(LoadInst *LI); 259009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner void add(StoreInst *SI); 260b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void add(CallSite CS); // Call/Invoke instructions 261b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void add(CallInst *CI) { add(CallSite(CI)); } 2629971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner void add(InvokeInst *II) { add(CallSite(II)); } 263b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void add(Instruction *I); // Dispatch to one of the other add methods... 264b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void add(BasicBlock &BB); // Add all instructions in basic block 265b75f9dda9e436b346c684c3694fbef6b14a00795Chris Lattner void add(const AliasSetTracker &AST); // Add alias relations from another AST 266009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 2672cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner /// remove method - This method is used to remove a pointer value from the 2682cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner /// AliasSetTracker entirely. It should be used when an instruction is 2692cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner /// deleted from the program to update the AST. If you don't use this, you 2702cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner /// would have dangling pointers to deleted instructions. 2712cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner /// 2722cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner void remove(Value *PtrVal); 2732cffeec014537a5f4d2313a5c21c3aa6fcf33288Chris Lattner 274009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner /// getAliasSets - Return the alias sets that are active. 2759971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner const ilist<AliasSet> &getAliasSets() const { return AliasSets; } 2769971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2779971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// getAliasSetForPointer - Return the alias set that the specified pointer 2789971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// lives in... 27931a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner AliasSet &getAliasSetForPointer(Value *P, unsigned Size); 2809971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2819971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// getAliasAnalysis - Return the underlying alias analysis object used by 2829971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner /// this tracker. 2839971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasAnalysis &getAliasAnalysis() const { return AA; } 2849971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2859971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner typedef ilist<AliasSet>::iterator iterator; 2869971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner typedef ilist<AliasSet>::const_iterator const_iterator; 2879971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2889971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner const_iterator begin() const { return AliasSets.begin(); } 2899971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner const_iterator end() const { return AliasSets.end(); } 2909971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2919971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner iterator begin() { return AliasSets.begin(); } 2929971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner iterator end() { return AliasSets.end(); } 2939971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 2949971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner void print(std::ostream &OS) const; 2959971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner void dump() const; 296009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 297009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattnerprivate: 2989971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner friend class AliasSet; 2999971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner void removeAliasSet(AliasSet *AS); 3009971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 3019971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet::HashNodePair &getEntryFor(Value *V) { 3029971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner // Standard operator[], except that it returns the whole pair, not just 3039971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner // ->second. 3049971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner return *PointerMap.insert(AliasSet::HashNodePair(V, 3059971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet::PointerRec())).first; 3069971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 3079971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 308bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner AliasSet &addPointer(Value *P, unsigned Size, AliasSet::AccessType E) { 30931a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner AliasSet &AS = getAliasSetForPointer(P, Size); 3109971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AS.AccessTy |= E; 311bb8f4769a2ee48b82c30de52083942781e920dd9Chris Lattner return AS; 3129971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner } 31331a9d185bfa253af2f0fece59d8b1227dad64b15Chris Lattner AliasSet *findAliasSetForPointer(const Value *Ptr, unsigned Size); 3149971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 3159971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AliasSet *findAliasSetForCallSite(CallSite CS); 316009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner}; 317009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner 3189971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattnerinline std::ostream& operator<<(std::ostream &OS, const AliasSetTracker &AST) { 3199971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner AST.print(OS); 3209971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner return OS; 3219971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner} 3229971ac4a36c54488bcdf55d7e493ac0cd6dc168aChris Lattner 323d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke} // End llvm namespace 324d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 325009cc3d2e85674f01f70d915e0c802d89d0b672fChris Lattner#endif 326