X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FAnalysis%2FAliasAnalysis.cpp;h=c8c43a69ef743bb841505fa9e825da66c490498d;hb=73b43b9b549a75fb0015c825df68abd95705a67c;hp=2a3ac5ae17c8fee7b65f09998c92d49de8524bbd;hpb=514ab348fddcdffa8367685dc608b2f8d5de986d;p=oota-llvm.git

diff --git a/lib/Analysis/AliasAnalysis.cpp b/lib/Analysis/AliasAnalysis.cpp
index 2a3ac5ae17c..c8c43a69ef7 100644
--- a/lib/Analysis/AliasAnalysis.cpp
+++ b/lib/Analysis/AliasAnalysis.cpp
@@ -2,8 +2,8 @@
 //
 //                     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.
 //
 //===----------------------------------------------------------------------===//
 //
@@ -27,15 +27,14 @@
 #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;
 
 //===----------------------------------------------------------------------===//
@@ -112,16 +111,40 @@ AliasAnalysis::getModRefInfo(StoreInst *S, Value *P, unsigned Size) {
   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;
 
@@ -140,7 +163,7 @@ AliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
 //
 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) {