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Thread const correctness through a bunch of AliasAnalysis interfaces and

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eliminate several const_casts.

Make CallSite implicitly convertible to ImmutableCallSite.

Rename the getModRefBehavior for intrinsic IDs to
getIntrinsicModRefBehavior to avoid overload ambiguity with CallSite,
which happens to be implicitly convertible to bool.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110155 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-08-03 21:48:53 +00:00
parent d1fb583128
commit 79fca6fea8
13 changed files with 133 additions and 103 deletions
Download Patch File Download Diff File Expand all files Collapse all files

65
lib/Analysis/IPA/GlobalsModRef.cpp
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@@ -47,14 +47,15 @@ namespace {
/// GlobalInfo - Maintain mod/ref info for all of the globals without
/// addresses taken that are read or written (transitively) by this
/// function.
std::map<GlobalValue*, unsigned> GlobalInfo;
std::map<const GlobalValue*, unsigned> GlobalInfo;
/// MayReadAnyGlobal - May read global variables, but it is not known which.
bool MayReadAnyGlobal;
unsigned getInfoForGlobal(GlobalValue *GV) const {
unsigned getInfoForGlobal(const GlobalValue *GV) const {
unsigned Effect = MayReadAnyGlobal ? AliasAnalysis::Ref : 0;
std::map<GlobalValue*, unsigned>::const_iterator I = GlobalInfo.find(GV);
std::map<const GlobalValue*, unsigned>::const_iterator I =
GlobalInfo.find(GV);
if (I != GlobalInfo.end())
Effect |= I->second;
return Effect;
@@ -71,19 +72,19 @@ namespace {
class GlobalsModRef : public ModulePass, public AliasAnalysis {
/// NonAddressTakenGlobals - The globals that do not have their addresses
/// taken.
std::set<GlobalValue*> NonAddressTakenGlobals;
std::set<const GlobalValue*> NonAddressTakenGlobals;
/// IndirectGlobals - The memory pointed to by this global is known to be
/// 'owned' by the global.
std::set<GlobalValue*> IndirectGlobals;
std::set<const GlobalValue*> IndirectGlobals;
/// AllocsForIndirectGlobals - If an instruction allocates memory for an
/// indirect global, this map indicates which one.
std::map<Value*, GlobalValue*> AllocsForIndirectGlobals;
std::map<const Value*, const GlobalValue*> AllocsForIndirectGlobals;
/// FunctionInfo - For each function, keep track of what globals are
/// modified or read.
std::map<Function*, FunctionRecord> FunctionInfo;
std::map<const Function*, FunctionRecord> FunctionInfo;
public:
static char ID;
@@ -107,16 +108,18 @@ namespace {
//
AliasResult alias(const Value *V1, unsigned V1Size,
const Value *V2, unsigned V2Size);
ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size);
ModRefResult getModRefInfo(CallSite CS1, CallSite CS2) {
return AliasAnalysis::getModRefInfo(CS1,CS2);
ModRefResult getModRefInfo(ImmutableCallSite CS,
const Value *P, unsigned Size);
ModRefResult getModRefInfo(ImmutableCallSite CS1,
ImmutableCallSite CS2) {
return AliasAnalysis::getModRefInfo(CS1, CS2);
}
/// 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(Function *F,
std::vector<PointerAccessInfo> *Info) {
ModRefBehavior getModRefBehavior(const Function *F,
std::vector<PointerAccessInfo> *Info) {
if (FunctionRecord *FR = getFunctionInfo(F)) {
if (FR->FunctionEffect == 0)
return DoesNotAccessMemory;
@@ -129,9 +132,9 @@ namespace {
/// 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(CallSite CS,
std::vector<PointerAccessInfo> *Info) {
Function* F = CS.getCalledFunction();
ModRefBehavior getModRefBehavior(ImmutableCallSite CS,
std::vector<PointerAccessInfo> *Info) {
const Function* F = CS.getCalledFunction();
if (!F) return AliasAnalysis::getModRefBehavior(CS, Info);
if (FunctionRecord *FR = getFunctionInfo(F)) {
if (FR->FunctionEffect == 0)
@@ -158,8 +161,9 @@ namespace {
private:
/// getFunctionInfo - Return the function info for the function, or null if
/// we don't have anything useful to say about it.
FunctionRecord *getFunctionInfo(Function *F) {
std::map<Function*, FunctionRecord>::iterator I = FunctionInfo.find(F);
FunctionRecord *getFunctionInfo(const Function *F) {
std::map<const Function*, FunctionRecord>::iterator I =
FunctionInfo.find(F);
if (I != FunctionInfo.end())
return &I->second;
return 0;
@@ -409,7 +413,7 @@ void GlobalsModRef::AnalyzeCallGraph(CallGraph &CG, Module &M) {
FunctionEffect |= CalleeFR->FunctionEffect;
// Incorporate callee's effects on globals into our info.
for (std::map<GlobalValue*, unsigned>::iterator GI =
for (std::map<const GlobalValue*, unsigned>::iterator GI =
CalleeFR->GlobalInfo.begin(), E = CalleeFR->GlobalInfo.end();
GI != E; ++GI)
FR.GlobalInfo[GI->first] |= GI->second;
@@ -477,13 +481,13 @@ AliasAnalysis::AliasResult
GlobalsModRef::alias(const Value *V1, unsigned V1Size,
const Value *V2, unsigned V2Size) {
// Get the base object these pointers point to.
Value *UV1 = const_cast<Value*>(V1->getUnderlyingObject());
Value *UV2 = const_cast<Value*>(V2->getUnderlyingObject());
const Value *UV1 = V1->getUnderlyingObject();
const Value *UV2 = V2->getUnderlyingObject();
// If either of the underlying values is a global, they may be non-addr-taken
// globals, which we can answer queries about.
GlobalValue *GV1 = dyn_cast<GlobalValue>(UV1);
GlobalValue *GV2 = dyn_cast<GlobalValue>(UV2);
const GlobalValue *GV1 = dyn_cast<GlobalValue>(UV1);
const GlobalValue *GV2 = dyn_cast<GlobalValue>(UV2);
if (GV1 || GV2) {
// If the global's address is taken, pretend we don't know it's a pointer to
// the global.
@@ -503,12 +507,12 @@ GlobalsModRef::alias(const Value *V1, unsigned V1Size,
// so, we may be able to handle this. First check to see if the base pointer
// is a direct load from an indirect global.
GV1 = GV2 = 0;
if (LoadInst *LI = dyn_cast<LoadInst>(UV1))
if (const LoadInst *LI = dyn_cast<LoadInst>(UV1))
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(LI->getOperand(0)))
if (IndirectGlobals.count(GV))
GV1 = GV;
if (LoadInst *LI = dyn_cast<LoadInst>(UV2))
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(LI->getOperand(0)))
if (const LoadInst *LI = dyn_cast<LoadInst>(UV2))
if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(LI->getOperand(0)))
if (IndirectGlobals.count(GV))
GV2 = GV;
@@ -530,16 +534,17 @@ GlobalsModRef::alias(const Value *V1, unsigned V1Size,
}
AliasAnalysis::ModRefResult
GlobalsModRef::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
GlobalsModRef::getModRefInfo(ImmutableCallSite CS,
const Value *P, unsigned Size) {
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 (GlobalValue *GV = dyn_cast<GlobalValue>(P->getUnderlyingObject()))
if (const GlobalValue *GV = dyn_cast<GlobalValue>(P->getUnderlyingObject()))
if (GV->hasLocalLinkage())
if (Function *F = CS.getCalledFunction())
if (const Function *F = CS.getCalledFunction())
if (NonAddressTakenGlobals.count(GV))
if (FunctionRecord *FR = getFunctionInfo(F))
if (const FunctionRecord *FR = getFunctionInfo(F))
Known = FR->getInfoForGlobal(GV);
if (Known == NoModRef)
@@ -558,7 +563,7 @@ void GlobalsModRef::deleteValue(Value *V) {
// any AllocRelatedValues for it.
if (IndirectGlobals.erase(GV)) {
// Remove any entries in AllocsForIndirectGlobals for this global.
for (std::map<Value*, GlobalValue*>::iterator
for (std::map<const Value*, const GlobalValue*>::iterator
I = AllocsForIndirectGlobals.begin(),
E = AllocsForIndirectGlobals.end(); I != E; ) {
if (I->second == GV) {