mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
2cffeec014
a pointer from an AliasSet, maintain the pointer values on a doubly linked list instead of a singly linked list, to permit efficient removal from the middle of the list. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10506 91177308-0d34-0410-b5e6-96231b3b80d8
326 lines
10 KiB
C++
326 lines
10 KiB
C++
//===- llvm/Analysis/AliasSetTracker.h - Build Alias Sets -------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines two classes: AliasSetTracker and AliasSet. These interface
|
|
// are used to classify a collection of pointer references into a maximal number
|
|
// of disjoint sets. Each AliasSet object constructed by the AliasSetTracker
|
|
// object refers to memory disjoint from the other sets.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ANALYSIS_ALIASSETTRACKER_H
|
|
#define LLVM_ANALYSIS_ALIASSETTRACKER_H
|
|
|
|
#include "llvm/Support/CallSite.h"
|
|
#include "Support/iterator"
|
|
#include "Support/hash_map"
|
|
#include "Support/ilist"
|
|
|
|
namespace llvm {
|
|
|
|
class AliasAnalysis;
|
|
class LoadInst;
|
|
class StoreInst;
|
|
class AliasSetTracker;
|
|
class AliasSet;
|
|
|
|
class AliasSet {
|
|
friend class AliasSetTracker;
|
|
|
|
struct PointerRec;
|
|
typedef std::pair<Value* const, PointerRec> HashNodePair;
|
|
|
|
class PointerRec {
|
|
HashNodePair **PrevInList, *NextInList;
|
|
AliasSet *AS;
|
|
unsigned Size;
|
|
public:
|
|
PointerRec() : PrevInList(0), NextInList(0), AS(0), Size(0) {}
|
|
|
|
HashNodePair *getNext() const { return NextInList; }
|
|
bool hasAliasSet() const { return AS != 0; }
|
|
|
|
HashNodePair** setPrevInList(HashNodePair **PIL) {
|
|
PrevInList = PIL;
|
|
return &NextInList;
|
|
}
|
|
|
|
void updateSize(unsigned NewSize) {
|
|
if (NewSize > Size) Size = NewSize;
|
|
}
|
|
|
|
unsigned getSize() const { return Size; }
|
|
|
|
AliasSet *getAliasSet(AliasSetTracker &AST) {
|
|
assert(AS && "No AliasSet yet!");
|
|
if (AS->Forward) {
|
|
AliasSet *OldAS = AS;
|
|
AS = OldAS->getForwardedTarget(AST);
|
|
if (--OldAS->RefCount == 0)
|
|
OldAS->removeFromTracker(AST);
|
|
AS->RefCount++;
|
|
}
|
|
return AS;
|
|
}
|
|
|
|
void setAliasSet(AliasSet *as) {
|
|
assert(AS == 0 && "Already have an alias set!");
|
|
AS = as;
|
|
}
|
|
|
|
void removeFromList() {
|
|
if (NextInList) NextInList->second.PrevInList = PrevInList;
|
|
*PrevInList = NextInList;
|
|
}
|
|
};
|
|
|
|
HashNodePair *PtrList, **PtrListEnd; // Doubly linked list of nodes
|
|
AliasSet *Forward; // Forwarding pointer
|
|
AliasSet *Next, *Prev; // Doubly linked list of AliasSets
|
|
|
|
std::vector<CallSite> CallSites; // All calls & invokes in this node
|
|
|
|
// RefCount - Number of nodes pointing to this AliasSet plus the number of
|
|
// AliasSets forwarding to it.
|
|
unsigned RefCount : 28;
|
|
|
|
/// AccessType - Keep track of whether this alias set merely refers to the
|
|
/// locations of memory, whether it modifies the memory, or whether it does
|
|
/// both. The lattice goes from "NoModRef" to either Refs or Mods, then to
|
|
/// ModRef as necessary.
|
|
///
|
|
enum AccessType {
|
|
NoModRef = 0, Refs = 1, // Ref = bit 1
|
|
Mods = 2, ModRef = 3 // Mod = bit 2
|
|
};
|
|
unsigned AccessTy : 2;
|
|
|
|
/// AliasType - Keep track the relationships between the pointers in the set.
|
|
/// Lattice goes from MustAlias to MayAlias.
|
|
///
|
|
enum AliasType {
|
|
MustAlias = 0, MayAlias = 1
|
|
};
|
|
unsigned AliasTy : 1;
|
|
|
|
// Volatile - True if this alias set contains volatile loads or stores.
|
|
bool Volatile : 1;
|
|
|
|
friend class ilist_traits<AliasSet>;
|
|
AliasSet *getPrev() const { return Prev; }
|
|
AliasSet *getNext() const { return Next; }
|
|
void setPrev(AliasSet *P) { Prev = P; }
|
|
void setNext(AliasSet *N) { Next = N; }
|
|
|
|
public:
|
|
/// Accessors...
|
|
bool isRef() const { return AccessTy & Refs; }
|
|
bool isMod() const { return AccessTy & Mods; }
|
|
bool isMustAlias() const { return AliasTy == MustAlias; }
|
|
bool isMayAlias() const { return AliasTy == MayAlias; }
|
|
|
|
// isVolatile - Return true if this alias set contains volatile loads or
|
|
// stores.
|
|
bool isVolatile() const { return Volatile; }
|
|
|
|
|
|
/// isForwardingAliasSet - Return true if this alias set should be ignored as
|
|
/// part of the AliasSetTracker object.
|
|
bool isForwardingAliasSet() const { return Forward; }
|
|
|
|
/// mergeSetIn - Merge the specified alias set into this alias set...
|
|
///
|
|
void mergeSetIn(AliasSet &AS);
|
|
|
|
// Alias Set iteration - Allow access to all of the pointer which are part of
|
|
// this alias set...
|
|
class iterator;
|
|
iterator begin() const { return iterator(PtrList); }
|
|
iterator end() const { return iterator(); }
|
|
|
|
void print(std::ostream &OS) const;
|
|
void dump() const;
|
|
|
|
/// Define an iterator for alias sets... this is just a forward iterator.
|
|
class iterator : public forward_iterator<HashNodePair, ptrdiff_t> {
|
|
HashNodePair *CurNode;
|
|
public:
|
|
iterator(HashNodePair *CN = 0) : CurNode(CN) {}
|
|
|
|
bool operator==(const iterator& x) const {
|
|
return CurNode == x.CurNode;
|
|
}
|
|
bool operator!=(const iterator& x) const { return !operator==(x); }
|
|
|
|
const iterator &operator=(const iterator &I) {
|
|
CurNode = I.CurNode;
|
|
return *this;
|
|
}
|
|
|
|
value_type &operator*() const {
|
|
assert(CurNode && "Dereferencing AliasSet.end()!");
|
|
return *CurNode;
|
|
}
|
|
value_type *operator->() const { return &operator*(); }
|
|
|
|
iterator& operator++() { // Preincrement
|
|
assert(CurNode && "Advancing past AliasSet.end()!");
|
|
CurNode = CurNode->second.getNext();
|
|
return *this;
|
|
}
|
|
iterator operator++(int) { // Postincrement
|
|
iterator tmp = *this; ++*this; return tmp;
|
|
}
|
|
};
|
|
|
|
private:
|
|
// Can only be created by AliasSetTracker
|
|
AliasSet() : PtrList(0), PtrListEnd(&PtrList), Forward(0), RefCount(0),
|
|
AccessTy(NoModRef), AliasTy(MustAlias), Volatile(false) {
|
|
}
|
|
AliasSet(const AliasSet &AS) {
|
|
// AliasSet's only get copy constructed in simple circumstances. In
|
|
// particular, they cannot have any pointers in their list. Despite this,
|
|
// we have to be sure to update the PtrListEnd to not point to the source
|
|
// AliasSet's list.
|
|
assert(AS.PtrList == 0 && "AliasSet has pointers in it!");
|
|
PtrList = 0; PtrListEnd = &PtrList;
|
|
Forward = AS.Forward; RefCount = AS.RefCount;
|
|
AccessTy = AS.AccessTy; AliasTy = AS.AliasTy; Volatile = AS.Volatile;
|
|
}
|
|
|
|
HashNodePair *getSomePointer() const {
|
|
return PtrList;
|
|
}
|
|
|
|
/// getForwardedTarget - Return the real alias set this represents. If this
|
|
/// has been merged with another set and is forwarding, return the ultimate
|
|
/// destination set. This also implements the union-find collapsing as well.
|
|
AliasSet *getForwardedTarget(AliasSetTracker &AST) {
|
|
if (!Forward) return this;
|
|
|
|
AliasSet *Dest = Forward->getForwardedTarget(AST);
|
|
if (Dest != Forward) {
|
|
Dest->RefCount++;
|
|
if (--Forward->RefCount == 0)
|
|
Forward->removeFromTracker(AST);
|
|
Forward = Dest;
|
|
}
|
|
return Dest;
|
|
}
|
|
|
|
void removeFromTracker(AliasSetTracker &AST);
|
|
|
|
void addPointer(AliasSetTracker &AST, HashNodePair &Entry, unsigned Size);
|
|
void addCallSite(CallSite CS);
|
|
void setVolatile() { Volatile = true; }
|
|
|
|
/// aliasesPointer - Return true if the specified pointer "may" (or must)
|
|
/// alias one of the members in the set.
|
|
///
|
|
bool aliasesPointer(const Value *Ptr, unsigned Size, AliasAnalysis &AA) const;
|
|
bool aliasesCallSite(CallSite CS, AliasAnalysis &AA) const;
|
|
};
|
|
|
|
inline std::ostream& operator<<(std::ostream &OS, const AliasSet &AS) {
|
|
AS.print(OS);
|
|
return OS;
|
|
}
|
|
|
|
|
|
class AliasSetTracker {
|
|
AliasAnalysis &AA;
|
|
ilist<AliasSet> AliasSets;
|
|
|
|
// Map from pointers to their node
|
|
hash_map<Value*, AliasSet::PointerRec> PointerMap;
|
|
public:
|
|
/// AliasSetTracker ctor - Create an empty collection of AliasSets, and use
|
|
/// the specified alias analysis object to disambiguate load and store
|
|
/// addresses.
|
|
AliasSetTracker(AliasAnalysis &aa) : AA(aa) {}
|
|
|
|
/// add methods - These methods are used to add different types of
|
|
/// instructions to the alias sets. Adding a new instruction can result in
|
|
/// one of three actions happening:
|
|
///
|
|
/// 1. If the instruction doesn't alias any other sets, create a new set.
|
|
/// 2. If the instruction aliases exactly one set, add it to the set
|
|
/// 3. If the instruction aliases multiple sets, merge the sets, and add
|
|
/// the instruction to the result.
|
|
///
|
|
void add(LoadInst *LI);
|
|
void add(StoreInst *SI);
|
|
void add(CallSite CS); // Call/Invoke instructions
|
|
void add(CallInst *CI) { add(CallSite(CI)); }
|
|
void add(InvokeInst *II) { add(CallSite(II)); }
|
|
void add(Instruction *I); // Dispatch to one of the other add methods...
|
|
void add(BasicBlock &BB); // Add all instructions in basic block
|
|
void add(const AliasSetTracker &AST); // Add alias relations from another AST
|
|
|
|
/// remove method - This method is used to remove a pointer value from the
|
|
/// AliasSetTracker entirely. It should be used when an instruction is
|
|
/// deleted from the program to update the AST. If you don't use this, you
|
|
/// would have dangling pointers to deleted instructions.
|
|
///
|
|
void remove(Value *PtrVal);
|
|
|
|
/// getAliasSets - Return the alias sets that are active.
|
|
const ilist<AliasSet> &getAliasSets() const { return AliasSets; }
|
|
|
|
/// getAliasSetForPointer - Return the alias set that the specified pointer
|
|
/// lives in...
|
|
AliasSet &getAliasSetForPointer(Value *P, unsigned Size);
|
|
|
|
/// getAliasAnalysis - Return the underlying alias analysis object used by
|
|
/// this tracker.
|
|
AliasAnalysis &getAliasAnalysis() const { return AA; }
|
|
|
|
typedef ilist<AliasSet>::iterator iterator;
|
|
typedef ilist<AliasSet>::const_iterator const_iterator;
|
|
|
|
const_iterator begin() const { return AliasSets.begin(); }
|
|
const_iterator end() const { return AliasSets.end(); }
|
|
|
|
iterator begin() { return AliasSets.begin(); }
|
|
iterator end() { return AliasSets.end(); }
|
|
|
|
void print(std::ostream &OS) const;
|
|
void dump() const;
|
|
|
|
private:
|
|
friend class AliasSet;
|
|
void removeAliasSet(AliasSet *AS);
|
|
|
|
AliasSet::HashNodePair &getEntryFor(Value *V) {
|
|
// Standard operator[], except that it returns the whole pair, not just
|
|
// ->second.
|
|
return *PointerMap.insert(AliasSet::HashNodePair(V,
|
|
AliasSet::PointerRec())).first;
|
|
}
|
|
|
|
AliasSet &addPointer(Value *P, unsigned Size, AliasSet::AccessType E) {
|
|
AliasSet &AS = getAliasSetForPointer(P, Size);
|
|
AS.AccessTy |= E;
|
|
return AS;
|
|
}
|
|
AliasSet *findAliasSetForPointer(const Value *Ptr, unsigned Size);
|
|
|
|
AliasSet *findAliasSetForCallSite(CallSite CS);
|
|
};
|
|
|
|
inline std::ostream& operator<<(std::ostream &OS, const AliasSetTracker &AST) {
|
|
AST.print(OS);
|
|
return OS;
|
|
}
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|