#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/MemoryBuiltins.h"
+#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/ADT/Statistic.h"
public:
static char ID;
- GlobalsModRef() : ModulePass(&ID) {}
+ GlobalsModRef() : ModulePass(ID) {
+ initializeGlobalsModRefPass(*PassRegistry::getPassRegistry());
+ }
bool runOnModule(Module &M) {
InitializeAliasAnalysis(this); // set up super class
//------------------------------------------------
// Implement the AliasAnalysis API
//
- AliasResult alias(const Value *V1, unsigned V1Size,
- const Value *V2, unsigned V2Size);
+ AliasResult alias(const Location &LocA, const Location &LocB);
ModRefResult getModRefInfo(ImmutableCallSite CS,
- const Value *P, unsigned Size);
+ const Location &Loc);
ModRefResult getModRefInfo(ImmutableCallSite CS1,
ImmutableCallSite CS2) {
return AliasAnalysis::getModRefInfo(CS1, CS2);
/// called from the specified call site. The call site may be null in which
/// case the most generic behavior of this function should be returned.
ModRefBehavior getModRefBehavior(const Function *F) {
+ ModRefBehavior Min = UnknownModRefBehavior;
+
if (FunctionRecord *FR = getFunctionInfo(F)) {
if (FR->FunctionEffect == 0)
- return DoesNotAccessMemory;
+ Min = DoesNotAccessMemory;
else if ((FR->FunctionEffect & Mod) == 0)
- return OnlyReadsMemory;
+ Min = OnlyReadsMemory;
}
- return AliasAnalysis::getModRefBehavior(F);
+
+ return ModRefBehavior(AliasAnalysis::getModRefBehavior(F) & Min);
}
/// getModRefBehavior - Return the behavior of the specified function if
/// called from the specified call site. The call site may be null in which
/// case the most generic behavior of this function should be returned.
ModRefBehavior getModRefBehavior(ImmutableCallSite CS) {
- const Function* F = CS.getCalledFunction();
- if (!F) return AliasAnalysis::getModRefBehavior(CS);
- if (FunctionRecord *FR = getFunctionInfo(F)) {
- if (FR->FunctionEffect == 0)
- return DoesNotAccessMemory;
- else if ((FR->FunctionEffect & Mod) == 0)
- return OnlyReadsMemory;
- }
- return AliasAnalysis::getModRefBehavior(CS);
+ ModRefBehavior Min = UnknownModRefBehavior;
+
+ if (const Function* F = CS.getCalledFunction())
+ if (FunctionRecord *FR = getFunctionInfo(F)) {
+ if (FR->FunctionEffect == 0)
+ Min = DoesNotAccessMemory;
+ else if ((FR->FunctionEffect & Mod) == 0)
+ Min = OnlyReadsMemory;
+ }
+
+ return ModRefBehavior(AliasAnalysis::getModRefBehavior(CS) & Min);
}
virtual void deleteValue(Value *V);
virtual void copyValue(Value *From, Value *To);
+ virtual void addEscapingUse(Use &U);
/// getAdjustedAnalysisPointer - This method is used when a pass implements
/// an analysis interface through multiple inheritance. If needed, it
/// should override this to adjust the this pointer as needed for the
/// specified pass info.
- virtual void *getAdjustedAnalysisPointer(const PassInfo *PI) {
- if (PI->isPassID(&AliasAnalysis::ID))
+ virtual void *getAdjustedAnalysisPointer(AnalysisID PI) {
+ if (PI == &AliasAnalysis::ID)
return (AliasAnalysis*)this;
return this;
}
}
char GlobalsModRef::ID = 0;
-static RegisterPass<GlobalsModRef>
-X("globalsmodref-aa", "Simple mod/ref analysis for globals", false, true);
-static RegisterAnalysisGroup<AliasAnalysis> Y(X);
+INITIALIZE_AG_PASS_BEGIN(GlobalsModRef, AliasAnalysis,
+ "globalsmodref-aa", "Simple mod/ref analysis for globals",
+ false, true, false)
+INITIALIZE_AG_DEPENDENCY(CallGraph)
+INITIALIZE_AG_PASS_END(GlobalsModRef, AliasAnalysis,
+ "globalsmodref-aa", "Simple mod/ref analysis for globals",
+ false, true, false)
Pass *llvm::createGlobalsModRefPass() { return new GlobalsModRef(); }
continue;
// Check the value being stored.
- Value *Ptr = SI->getOperand(0)->getUnderlyingObject();
+ Value *Ptr = GetUnderlyingObject(SI->getOperand(0));
if (isMalloc(Ptr)) {
// Okay, easy case.
/// other is some random pointer, we know there cannot be an alias, because the
/// address of the global isn't taken.
AliasAnalysis::AliasResult
-GlobalsModRef::alias(const Value *V1, unsigned V1Size,
- const Value *V2, unsigned V2Size) {
+GlobalsModRef::alias(const Location &LocA,
+ const Location &LocB) {
// Get the base object these pointers point to.
- const Value *UV1 = V1->getUnderlyingObject();
- const Value *UV2 = V2->getUnderlyingObject();
+ const Value *UV1 = GetUnderlyingObject(LocA.Ptr);
+ const Value *UV2 = GetUnderlyingObject(LocB.Ptr);
// If either of the underlying values is a global, they may be non-addr-taken
// globals, which we can answer queries about.
if ((GV1 || GV2) && GV1 != GV2)
return NoAlias;
- return AliasAnalysis::alias(V1, V1Size, V2, V2Size);
+ return AliasAnalysis::alias(LocA, LocB);
}
AliasAnalysis::ModRefResult
GlobalsModRef::getModRefInfo(ImmutableCallSite CS,
- const Value *P, unsigned Size) {
+ const Location &Loc) {
unsigned Known = ModRef;
// If we are asking for mod/ref info of a direct call with a pointer to a
// global we are tracking, return information if we have it.
- if (const GlobalValue *GV = dyn_cast<GlobalValue>(P->getUnderlyingObject()))
+ if (const GlobalValue *GV =
+ dyn_cast<GlobalValue>(GetUnderlyingObject(Loc.Ptr)))
if (GV->hasLocalLinkage())
if (const Function *F = CS.getCalledFunction())
if (NonAddressTakenGlobals.count(GV))
if (Known == NoModRef)
return NoModRef; // No need to query other mod/ref analyses
- return ModRefResult(Known & AliasAnalysis::getModRefInfo(CS, P, Size));
+ return ModRefResult(Known & AliasAnalysis::getModRefInfo(CS, Loc));
}
void GlobalsModRef::copyValue(Value *From, Value *To) {
AliasAnalysis::copyValue(From, To);
}
+
+void GlobalsModRef::addEscapingUse(Use &U) {
+ // For the purposes of this analysis, it is conservatively correct to treat
+ // a newly escaping value equivalently to a deleted one. We could perhaps
+ // be more precise by processing the new use and attempting to update our
+ // saved analysis results to accomodate it.
+ deleteValue(U);
+
+ AliasAnalysis::addEscapingUse(U);
+}
projects / oota-llvm.git / blobdiff