//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Pass.h"
#include "llvm/BasicBlock.h"
+#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/Type.h"
#include "llvm/Target/TargetData.h"
using namespace llvm;
// Register the AliasAnalysis interface, providing a nice name to refer to.
-namespace {
- RegisterAnalysisGroup<AliasAnalysis> Z("Alias Analysis");
-}
+static RegisterAnalysisGroup<AliasAnalysis> Z("Alias Analysis");
char AliasAnalysis::ID = 0;
//===----------------------------------------------------------------------===//
return pointsToConstantMemory(P) ? NoModRef : Mod;
}
+AliasAnalysis::ModRefBehavior
+AliasAnalysis::getModRefBehavior(CallSite CS,
+ std::vector<PointerAccessInfo> *Info) {
+ if (CS.doesNotAccessMemory())
+ // Can't do better than this.
+ return DoesNotAccessMemory;
+ ModRefBehavior MRB = UnknownModRefBehavior;
+ if (Function *F = CS.getCalledFunction())
+ MRB = getModRefBehavior(F, CS, Info);
+ if (MRB != DoesNotAccessMemory && CS.onlyReadsMemory())
+ return OnlyReadsMemory;
+ return MRB;
+}
+
+AliasAnalysis::ModRefBehavior
+AliasAnalysis::getModRefBehavior(Function *F,
+ std::vector<PointerAccessInfo> *Info) {
+ if (F->doesNotAccessMemory())
+ // Can't do better than this.
+ return DoesNotAccessMemory;
+ ModRefBehavior MRB = getModRefBehavior(F, CallSite(), Info);
+ if (MRB != DoesNotAccessMemory && F->onlyReadsMemory())
+ return OnlyReadsMemory;
+ return MRB;
+}
+
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
ModRefResult Mask = ModRef;
- if (Function *F = CS.getCalledFunction()) {
- ModRefBehavior MRB = getModRefBehavior(F, CallSite());
- if (MRB == OnlyReadsMemory)
- Mask = Ref;
- else if (MRB == DoesNotAccessMemory)
- return NoModRef;
- }
+ ModRefBehavior MRB = getModRefBehavior(CS);
+ if (MRB == OnlyReadsMemory)
+ Mask = Ref;
+ else if (MRB == DoesNotAccessMemory)
+ return NoModRef;
if (!AA) return Mask;
//
AliasAnalysis::~AliasAnalysis() {}
-/// setTargetData - Subclasses must call this method to initialize the
+/// InitializeAliasAnalysis - Subclasses must call this method to initialize the
/// AliasAnalysis interface before any other methods are called.
///
void AliasAnalysis::InitializeAliasAnalysis(Pass *P) {