index f3b29fe61bc09cb3bf92ab2112d24a11884a0903..4618c26bc65371a83dfa5c834eef6c885b0034a6 100644 (file)
//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "argpromotion"
#include "llvm/Transforms/IPO.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Module.h"
-#include "llvm/CallGraphSCCPass.h"
-#include "llvm/Instructions.h"
-#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/CallGraph.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Support/CallSite.h"
-#include "llvm/Support/CFG.h"
-#include "llvm/Support/Debug.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
-#include "llvm/Support/Compiler.h"
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/CallGraph.h"
+#include "llvm/Analysis/CallGraphSCCPass.h"
+#include "llvm/IR/CFG.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
#include <set>
using namespace llvm;
+#define DEBUG_TYPE "argpromotion"
+
STATISTIC(NumArgumentsPromoted , "Number of pointer arguments promoted");
STATISTIC(NumAggregatesPromoted, "Number of aggregate arguments promoted");
STATISTIC(NumByValArgsPromoted , "Number of byval arguments promoted");
namespace {
/// ArgPromotion - The 'by reference' to 'by value' argument promotion pass.
///
- struct VISIBILITY_HIDDEN ArgPromotion : public CallGraphSCCPass {
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ struct ArgPromotion : public CallGraphSCCPass {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<AliasAnalysis>();
- AU.addRequired<TargetData>();
CallGraphSCCPass::getAnalysisUsage(AU);
}
- virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC);
+ bool runOnSCC(CallGraphSCC &SCC) override;
static char ID; // Pass identification, replacement for typeid
- ArgPromotion(unsigned maxElements = 3) : CallGraphSCCPass(&ID),
- maxElements(maxElements) {}
+ explicit ArgPromotion(unsigned maxElements = 3)
+ : CallGraphSCCPass(ID), maxElements(maxElements) {
+ initializeArgPromotionPass(*PassRegistry::getPassRegistry());
+ }
/// A vector used to hold the indices of a single GEP instruction
typedef std::vector<uint64_t> IndicesVector;
private:
- bool PromoteArguments(CallGraphNode *CGN);
+ CallGraphNode *PromoteArguments(CallGraphNode *CGN);
bool isSafeToPromoteArgument(Argument *Arg, bool isByVal) const;
- Function *DoPromotion(Function *F,
- SmallPtrSet<Argument*, 8> &ArgsToPromote,
- SmallPtrSet<Argument*, 8> &ByValArgsToTransform);
+ CallGraphNode *DoPromotion(Function *F,
+ SmallPtrSet<Argument*, 8> &ArgsToPromote,
+ SmallPtrSet<Argument*, 8> &ByValArgsToTransform);
/// The maximum number of elements to expand, or 0 for unlimited.
unsigned maxElements;
};
}
char ArgPromotion::ID = 0;
-static RegisterPass<ArgPromotion>
-X("argpromotion", "Promote 'by reference' arguments to scalars");
+INITIALIZE_PASS_BEGIN(ArgPromotion, "argpromotion",
+ "Promote 'by reference' arguments to scalars", false, false)
+INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
+INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
+INITIALIZE_PASS_END(ArgPromotion, "argpromotion",
+ "Promote 'by reference' arguments to scalars", false, false)
Pass *llvm::createArgumentPromotionPass(unsigned maxElements) {
return new ArgPromotion(maxElements);
}
-bool ArgPromotion::runOnSCC(const std::vector<CallGraphNode *> &SCC) {
+bool ArgPromotion::runOnSCC(CallGraphSCC &SCC) {
bool Changed = false, LocalChange;
do { // Iterate until we stop promoting from this SCC.
LocalChange = false;
// Attempt to promote arguments from all functions in this SCC.
- for (unsigned i = 0, e = SCC.size(); i != e; ++i)
- LocalChange |= PromoteArguments(SCC[i]);
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
+ if (CallGraphNode *CGN = PromoteArguments(*I)) {
+ LocalChange = true;
+ SCC.ReplaceNode(*I, CGN);
+ }
+ }
Changed |= LocalChange; // Remember that we changed something.
} while (LocalChange);
-
+
return Changed;
}
/// example, all callers are direct). If safe to promote some arguments, it
/// calls the DoPromotion method.
///
-bool ArgPromotion::PromoteArguments(CallGraphNode *CGN) {
+CallGraphNode *ArgPromotion::PromoteArguments(CallGraphNode *CGN) {
Function *F = CGN->getFunction();
// Make sure that it is local to this module.
- if (!F || !F->hasInternalLinkage()) return false;
+ if (!F || !F->hasLocalLinkage()) return nullptr;
// First check: see if there are any pointer arguments! If not, quick exit.
- SmallVector<std::pair<Argument*, unsigned>, 16> PointerArgs;
- unsigned ArgNo = 0;
- for (Function::arg_iterator I = F->arg_begin(), E = F->arg_end();
- I != E; ++I, ++ArgNo)
- if (isa<PointerType>(I->getType()))
- PointerArgs.push_back(std::pair<Argument*, unsigned>(I, ArgNo));
- if (PointerArgs.empty()) return false;
+ SmallVector<Argument*, 16> PointerArgs;
+ for (Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I)
+ if (I->getType()->isPointerTy())
+ PointerArgs.push_back(I);
+ if (PointerArgs.empty()) return nullptr;
// Second check: make sure that all callers are direct callers. We can't
- // transform functions that have indirect callers.
- for (Value::use_iterator UI = F->use_begin(), E = F->use_end();
- UI != E; ++UI) {
- CallSite CS = CallSite::get(*UI);
- if (!CS.getInstruction()) // "Taking the address" of the function
- return false;
-
- // Ensure that this call site is CALLING the function, not passing it as
- // an argument.
- if (UI.getOperandNo() != 0)
- return false;
+ // transform functions that have indirect callers. Also see if the function
+ // is self-recursive.
+ bool isSelfRecursive = false;
+ for (Use &U : F->uses()) {
+ CallSite CS(U.getUser());
+ // Must be a direct call.
+ if (CS.getInstruction() == nullptr || !CS.isCallee(&U)) return nullptr;
+
+ if (CS.getInstruction()->getParent()->getParent() == F)
+ isSelfRecursive = true;
}
-
+
// Check to see which arguments are promotable. If an argument is promotable,
// add it to ArgsToPromote.
SmallPtrSet<Argument*, 8> ArgsToPromote;
SmallPtrSet<Argument*, 8> ByValArgsToTransform;
- for (unsigned i = 0; i != PointerArgs.size(); ++i) {
- bool isByVal = F->paramHasAttr(PointerArgs[i].second+1, ParamAttr::ByVal);
+ for (unsigned i = 0, e = PointerArgs.size(); i != e; ++i) {
+ Argument *PtrArg = PointerArgs[i];
+ Type *AgTy = cast<PointerType>(PtrArg->getType())->getElementType();
// If this is a byval argument, and if the aggregate type is small, just
- // pass the elements, which is always safe.
- Argument *PtrArg = PointerArgs[i].first;
- if (isByVal) {
- const Type *AgTy = cast<PointerType>(PtrArg->getType())->getElementType();
- if (const StructType *STy = dyn_cast<StructType>(AgTy)) {
+ // pass the elements, which is always safe. This does not apply to
+ // inalloca.
+ if (PtrArg->hasByValAttr()) {
+ if (StructType *STy = dyn_cast<StructType>(AgTy)) {
if (maxElements > 0 && STy->getNumElements() > maxElements) {
- DOUT << "argpromotion disable promoting argument '"
- << PtrArg->getName() << "' because it would require adding more "
- << "than " << maxElements << " arguments to the function.\n";
- } else {
- // If all the elements are single-value types, we can promote it.
- bool AllSimple = true;
- for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i)
- if (!STy->getElementType(i)->isSingleValueType()) {
- AllSimple = false;
- break;
- }
-
- // Safe to transform, don't even bother trying to "promote" it.
- // Passing the elements as a scalar will allow scalarrepl to hack on
- // the new alloca we introduce.
- if (AllSimple) {
- ByValArgsToTransform.insert(PtrArg);
- continue;
+ DEBUG(dbgs() << "argpromotion disable promoting argument '"
+ << PtrArg->getName() << "' because it would require adding more"
+ << " than " << maxElements << " arguments to the function.\n");
+ continue;
+ }
+
+ // If all the elements are single-value types, we can promote it.
+ bool AllSimple = true;
+ for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
+ if (!STy->getElementType(i)->isSingleValueType()) {
+ AllSimple = false;
+ break;
}
}
+
+ // Safe to transform, don't even bother trying to "promote" it.
+ // Passing the elements as a scalar will allow scalarrepl to hack on
+ // the new alloca we introduce.
+ if (AllSimple) {
+ ByValArgsToTransform.insert(PtrArg);
+ continue;
+ }
}
}
+ // If the argument is a recursive type and we're in a recursive
+ // function, we could end up infinitely peeling the function argument.
+ if (isSelfRecursive) {
+ if (StructType *STy = dyn_cast<StructType>(AgTy)) {
+ bool RecursiveType = false;
+ for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
+ if (STy->getElementType(i) == PtrArg->getType()) {
+ RecursiveType = true;
+ break;
+ }
+ }
+ if (RecursiveType)
+ continue;
+ }
+ }
+
// Otherwise, see if we can promote the pointer to its value.
- if (isSafeToPromoteArgument(PtrArg, isByVal))
+ if (isSafeToPromoteArgument(PtrArg, PtrArg->hasByValOrInAllocaAttr()))
ArgsToPromote.insert(PtrArg);
}
// No promotable pointer arguments.
- if (ArgsToPromote.empty() && ByValArgsToTransform.empty()) return false;
-
- Function *NewF = DoPromotion(F, ArgsToPromote, ByValArgsToTransform);
-
- // Update the call graph to know that the function has been transformed.
- getAnalysis<CallGraph>().changeFunction(F, NewF);
- return true;
-}
+ if (ArgsToPromote.empty() && ByValArgsToTransform.empty())
+ return nullptr;
-/// IsAlwaysValidPointer - Return true if the specified pointer is always legal
-/// to load.
-static bool IsAlwaysValidPointer(Value *V) {
- if (isa<AllocaInst>(V) || isa<GlobalVariable>(V)) return true;
- if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(V))
- return IsAlwaysValidPointer(GEP->getOperand(0));
- if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
- if (CE->getOpcode() == Instruction::GetElementPtr)
- return IsAlwaysValidPointer(CE->getOperand(0));
-
- return false;
+ return DoPromotion(F, ArgsToPromote, ByValArgsToTransform);
}
-/// AllCalleesPassInValidPointerForArgument - Return true if we can prove that
+/// AllCallersPassInValidPointerForArgument - Return true if we can prove that
/// all callees pass in a valid pointer for the specified function argument.
-static bool AllCalleesPassInValidPointerForArgument(Argument *Arg) {
+static bool AllCallersPassInValidPointerForArgument(Argument *Arg) {
Function *Callee = Arg->getParent();
- unsigned ArgNo = std::distance(Callee->arg_begin(),
- Function::arg_iterator(Arg));
+ unsigned ArgNo = Arg->getArgNo();
// Look at all call sites of the function. At this pointer we know we only
// have direct callees.
- for (Value::use_iterator UI = Callee->use_begin(), E = Callee->use_end();
- UI != E; ++UI) {
- CallSite CS = CallSite::get(*UI);
- assert(CS.getInstruction() && "Should only have direct calls!");
+ for (User *U : Callee->users()) {
+ CallSite CS(U);
+ assert(CS && "Should only have direct calls!");
- if (!IsAlwaysValidPointer(CS.getArgument(ArgNo)))
+ if (!CS.getArgument(ArgNo)->isDereferenceablePointer())
return false;
}
return true;
const ArgPromotion::IndicesVector &Longer) {
if (Prefix.size() > Longer.size())
return false;
- for (unsigned i = 0, e = Prefix.size(); i != e; ++i)
- if (Prefix[i] != Longer[i])
- return false;
- return true;
+ return std::equal(Prefix.begin(), Prefix.end(), Longer.begin());
}
return Low != Set.end() && IsPrefix(*Low, Indices);
}
-/// Mark the given indices (ToMark) as safe in the the given set of indices
+/// Mark the given indices (ToMark) as safe in the given set of indices
/// (Safe). Marking safe usually means adding ToMark to Safe. However, if there
/// is already a prefix of Indices in Safe, Indices are implicitely marked safe
/// already. Furthermore, any indices that Indices is itself a prefix of, are
/// This method limits promotion of aggregates to only promote up to three
/// elements of the aggregate in order to avoid exploding the number of
/// arguments passed in.
-bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
+bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg,
+ bool isByValOrInAlloca) const {
typedef std::set<IndicesVector> GEPIndicesSet;
// Quick exit for unused arguments
//
// This set will contain all sets of indices that are loaded in the entry
// block, and thus are safe to unconditionally load in the caller.
+ //
+ // This optimization is also safe for InAlloca parameters, because it verifies
+ // that the address isn't captured.
GEPIndicesSet SafeToUnconditionallyLoad;
// This set contains all the sets of indices that we are planning to promote.
GEPIndicesSet ToPromote;
// If the pointer is always valid, any load with first index 0 is valid.
- if(isByVal || AllCalleesPassInValidPointerForArgument(Arg))
+ if (isByValOrInAlloca || AllCallersPassInValidPointerForArgument(Arg))
SafeToUnconditionallyLoad.insert(IndicesVector(1, 0));
// First, iterate the entry block and mark loads of (geps of) arguments as
@@ -366,24 +374,25 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
// not (GEP+)loads, or any (GEP+)loads that are not safe to promote.
SmallVector<LoadInst*, 16> Loads;
IndicesVector Operands;
- for (Value::use_iterator UI = Arg->use_begin(), E = Arg->use_end();
- UI != E; ++UI) {
+ for (Use &U : Arg->uses()) {
+ User *UR = U.getUser();
Operands.clear();
- if (LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
- if (LI->isVolatile()) return false; // Don't hack volatile loads
+ if (LoadInst *LI = dyn_cast<LoadInst>(UR)) {
+ // Don't hack volatile/atomic loads
+ if (!LI->isSimple()) return false;
Loads.push_back(LI);
// Direct loads are equivalent to a GEP with a zero index and then a load.
Operands.push_back(0);
- } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(*UI)) {
+ } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(UR)) {
if (GEP->use_empty()) {
// Dead GEP's cause trouble later. Just remove them if we run into
// them.
getAnalysis<AliasAnalysis>().deleteValue(GEP);
GEP->eraseFromParent();
- // TODO: This runs the above loop over and over again for dead GEPS
+ // TODO: This runs the above loop over and over again for dead GEPs
// Couldn't we just do increment the UI iterator earlier and erase the
// use?
- return isSafeToPromoteArgument(Arg, isByVal);
+ return isSafeToPromoteArgument(Arg, isByValOrInAlloca);
}
// Ensure that all of the indices are constants.
@@ -395,10 +404,10 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
return false; // Not a constant operand GEP!
// Ensure that the only users of the GEP are load instructions.
- for (Value::use_iterator UI = GEP->use_begin(), E = GEP->use_end();
- UI != E; ++UI)
- if (LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
- if (LI->isVolatile()) return false; // Don't hack volatile loads
+ for (User *GEPU : GEP->users())
+ if (LoadInst *LI = dyn_cast<LoadInst>(GEPU)) {
+ // Don't hack volatile/atomic loads
+ if (!LI->isSimple()) return false;
Loads.push_back(LI);
} else {
// Other uses than load?
// to do.
if (ToPromote.find(Operands) == ToPromote.end()) {
if (maxElements > 0 && ToPromote.size() == maxElements) {
- DOUT << "argpromotion not promoting argument '"
- << Arg->getName() << "' because it would require adding more "
- << "than " << maxElements << " arguments to the function.\n";
+ DEBUG(dbgs() << "argpromotion not promoting argument '"
+ << Arg->getName() << "' because it would require adding more "
+ << "than " << maxElements << " arguments to the function.\n");
// We limit aggregate promotion to only promoting up to a fixed number
// of elements of the aggregate.
return false;
SmallPtrSet<BasicBlock*, 16> TranspBlocks;
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
- TargetData &TD = getAnalysis<TargetData>();
for (unsigned i = 0, e = Loads.size(); i != e; ++i) {
// Check to see if the load is invalidated from the start of the block to
@@ -449,22 +457,21 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
LoadInst *Load = Loads[i];
BasicBlock *BB = Load->getParent();
- const PointerType *LoadTy =
- cast<PointerType>(Load->getPointerOperand()->getType());
- unsigned LoadSize = (unsigned)TD.getTypeStoreSize(LoadTy->getElementType());
-
- if (AA.canInstructionRangeModify(BB->front(), *Load, Arg, LoadSize))
+ AliasAnalysis::Location Loc = AA.getLocation(Load);
+ if (AA.canInstructionRangeModify(BB->front(), *Load, Loc))
return false; // Pointer is invalidated!
// Now check every path from the entry block to the load for transparency.
// To do this, we perform a depth first search on the inverse CFG from the
// loading block.
- for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
+ for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) {
+ BasicBlock *P = *PI;
for (idf_ext_iterator<BasicBlock*, SmallPtrSet<BasicBlock*, 16> >
- I = idf_ext_begin(*PI, TranspBlocks),
- E = idf_ext_end(*PI, TranspBlocks); I != E; ++I)
- if (AA.canBasicBlockModify(**I, Arg, LoadSize))
+ I = idf_ext_begin(P, TranspBlocks),
+ E = idf_ext_end(P, TranspBlocks); I != E; ++I)
+ if (AA.canBasicBlockModify(**I, Loc))
return false;
+ }
}
// If the path from the entry of the function to each load is free of
@@ -476,14 +483,14 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
/// DoPromotion - This method actually performs the promotion of the specified
/// arguments, and returns the new function. At this point, we know that it's
/// safe to do so.
-Function *ArgPromotion::DoPromotion(Function *F,
- SmallPtrSet<Argument*, 8> &ArgsToPromote,
+CallGraphNode *ArgPromotion::DoPromotion(Function *F,
+ SmallPtrSet<Argument*, 8> &ArgsToPromote,
SmallPtrSet<Argument*, 8> &ByValArgsToTransform) {
// Start by computing a new prototype for the function, which is the same as
// the old function, but has modified arguments.
- const FunctionType *FTy = F->getFunctionType();
- std::vector<const Type*> Params;
+ FunctionType *FTy = F->getFunctionType();
+ std::vector<Type*> Params;
typedef std::set<IndicesVector> ScalarizeTable;
// OriginalLoads - Keep track of a representative load instruction from the
// original function so that we can tell the alias analysis implementation
// what the new GEP/Load instructions we are inserting look like.
- std::map<IndicesVector, LoadInst*> OriginalLoads;
+ // We need to keep the original loads for each argument and the elements
+ // of the argument that are accessed.
+ std::map<std::pair<Argument*, IndicesVector>, LoadInst*> OriginalLoads;
- // ParamAttrs - Keep track of the parameter attributes for the arguments
+ // Attribute - Keep track of the parameter attributes for the arguments
// that we are *not* promoting. For the ones that we do promote, the parameter
// attributes are lost
- SmallVector<ParamAttrsWithIndex, 8> ParamAttrsVec;
- const PAListPtr &PAL = F->getParamAttrs();
+ SmallVector<AttributeSet, 8> AttributesVec;
+ const AttributeSet &PAL = F->getAttributes();
// Add any return attributes.
- if (ParameterAttributes attrs = PAL.getParamAttrs(0))
- ParamAttrsVec.push_back(ParamAttrsWithIndex::get(0, attrs));
+ if (PAL.hasAttributes(AttributeSet::ReturnIndex))
+ AttributesVec.push_back(AttributeSet::get(F->getContext(),
+ PAL.getRetAttributes()));
// First, determine the new argument list
unsigned ArgIndex = 1;
++I, ++ArgIndex) {
if (ByValArgsToTransform.count(I)) {
// Simple byval argument? Just add all the struct element types.
- const Type *AgTy = cast<PointerType>(I->getType())->getElementType();
- const StructType *STy = cast<StructType>(AgTy);
+ Type *AgTy = cast<PointerType>(I->getType())->getElementType();
+ StructType *STy = cast<StructType>(AgTy);
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i)
Params.push_back(STy->getElementType(i));
++NumByValArgsPromoted;
} else if (!ArgsToPromote.count(I)) {
// Unchanged argument
Params.push_back(I->getType());
- if (ParameterAttributes attrs = PAL.getParamAttrs(ArgIndex))
- ParamAttrsVec.push_back(ParamAttrsWithIndex::get(Params.size(), attrs));
+ AttributeSet attrs = PAL.getParamAttributes(ArgIndex);
+ if (attrs.hasAttributes(ArgIndex)) {
+ AttrBuilder B(attrs, ArgIndex);
+ AttributesVec.
+ push_back(AttributeSet::get(F->getContext(), Params.size(), B));
+ }
} else if (I->use_empty()) {
// Dead argument (which are always marked as promotable)
++NumArgumentsDead;
// In this table, we will track which indices are loaded from the argument
// (where direct loads are tracked as no indices).
ScalarizeTable &ArgIndices = ScalarizedElements[I];
- for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E;
- ++UI) {
- Instruction *User = cast<Instruction>(*UI);
- assert(isa<LoadInst>(User) || isa<GetElementPtrInst>(User));
+ for (User *U : I->users()) {
+ Instruction *UI = cast<Instruction>(U);
+ assert(isa<LoadInst>(UI) || isa<GetElementPtrInst>(UI));
IndicesVector Indices;
- Indices.reserve(User->getNumOperands() - 1);
+ Indices.reserve(UI->getNumOperands() - 1);
// Since loads will only have a single operand, and GEPs only a single
// non-index operand, this will record direct loads without any indices,
// and gep+loads with the GEP indices.
- for (User::op_iterator II = User->op_begin() + 1, IE = User->op_end();
+ for (User::op_iterator II = UI->op_begin() + 1, IE = UI->op_end();
II != IE; ++II)
Indices.push_back(cast<ConstantInt>(*II)->getSExtValue());
// GEPs with a single 0 index can be merged with direct loads
Indices.clear();
ArgIndices.insert(Indices);
LoadInst *OrigLoad;
- if (LoadInst *L = dyn_cast<LoadInst>(User))
+ if (LoadInst *L = dyn_cast<LoadInst>(UI))
OrigLoad = L;
else
// Take any load, we will use it only to update Alias Analysis
- OrigLoad = cast<LoadInst>(User->use_back());
- OriginalLoads[Indices] = OrigLoad;
+ OrigLoad = cast<LoadInst>(UI->user_back());
+ OriginalLoads[std::make_pair(I, Indices)] = OrigLoad;
}
// Add a parameter to the function for each element passed in.
for (ScalarizeTable::iterator SI = ArgIndices.begin(),
E = ArgIndices.end(); SI != E; ++SI) {
- Params.push_back(GetElementPtrInst::getIndexedType(I->getType(),
- &*SI->begin(),
- SI->size()));
+ // not allowed to dereference ->begin() if size() is 0
+ Params.push_back(GetElementPtrInst::getIndexedType(I->getType(), *SI));
assert(Params.back());
}
}
}
- const Type *RetTy = FTy->getReturnType();
+ // Add any function attributes.
+ if (PAL.hasAttributes(AttributeSet::FunctionIndex))
+ AttributesVec.push_back(AttributeSet::get(FTy->getContext(),
+ PAL.getFnAttributes()));
- // Work around LLVM bug PR56: the CWriter cannot emit varargs functions which
- // have zero fixed arguments.
- bool ExtraArgHack = false;
- if (Params.empty() && FTy->isVarArg()) {
- ExtraArgHack = true;
- Params.push_back(Type::Int32Ty);
- }
+ Type *RetTy = FTy->getReturnType();
// Construct the new function type using the new arguments.
FunctionType *NFTy = FunctionType::get(RetTy, Params, FTy->isVarArg());
- // Create the new function body and insert it into the module...
+ // Create the new function body and insert it into the module.
Function *NF = Function::Create(NFTy, F->getLinkage(), F->getName());
NF->copyAttributesFrom(F);
+
+ DEBUG(dbgs() << "ARG PROMOTION: Promoting to:" << *NF << "\n"
+ << "From: " << *F);
+
// Recompute the parameter attributes list based on the new arguments for
// the function.
- NF->setParamAttrs(PAListPtr::get(ParamAttrsVec.begin(), ParamAttrsVec.end()));
- ParamAttrsVec.clear();
+ NF->setAttributes(AttributeSet::get(F->getContext(), AttributesVec));
+ AttributesVec.clear();
F->getParent()->getFunctionList().insert(F, NF);
NF->takeName(F);
// Get the callgraph information that we need to update to reflect our
// changes.
- CallGraph &CG = getAnalysis<CallGraph>();
+ CallGraph &CG = getAnalysis<CallGraphWrapperPass>().getCallGraph();
+
+ // Get a new callgraph node for NF.
+ CallGraphNode *NF_CGN = CG.getOrInsertFunction(NF);
// Loop over all of the callers of the function, transforming the call sites
// to pass in the loaded pointers.
//
SmallVector<Value*, 16> Args;
while (!F->use_empty()) {
- CallSite CS = CallSite::get(F->use_back());
+ CallSite CS(F->user_back());
+ assert(CS.getCalledFunction() == F);
Instruction *Call = CS.getInstruction();
- const PAListPtr &CallPAL = CS.getParamAttrs();
+ const AttributeSet &CallPAL = CS.getAttributes();
// Add any return attributes.
- if (ParameterAttributes attrs = CallPAL.getParamAttrs(0))
- ParamAttrsVec.push_back(ParamAttrsWithIndex::get(0, attrs));
+ if (CallPAL.hasAttributes(AttributeSet::ReturnIndex))
+ AttributesVec.push_back(AttributeSet::get(F->getContext(),
+ CallPAL.getRetAttributes()));
// Loop over the operands, inserting GEP and loads in the caller as
// appropriate.
if (!ArgsToPromote.count(I) && !ByValArgsToTransform.count(I)) {
Args.push_back(*AI); // Unmodified argument
- if (ParameterAttributes Attrs = CallPAL.getParamAttrs(ArgIndex))
- ParamAttrsVec.push_back(ParamAttrsWithIndex::get(Args.size(), Attrs));
-
+ if (CallPAL.hasAttributes(ArgIndex)) {
+ AttrBuilder B(CallPAL, ArgIndex);
+ AttributesVec.
+ push_back(AttributeSet::get(F->getContext(), Args.size(), B));
+ }
} else if (ByValArgsToTransform.count(I)) {
// Emit a GEP and load for each element of the struct.
- const Type *AgTy = cast<PointerType>(I->getType())->getElementType();
- const StructType *STy = cast<StructType>(AgTy);
- Value *Idxs[2] = { ConstantInt::get(Type::Int32Ty, 0), 0 };
+ Type *AgTy = cast<PointerType>(I->getType())->getElementType();
+ StructType *STy = cast<StructType>(AgTy);
+ Value *Idxs[2] = {
+ ConstantInt::get(Type::getInt32Ty(F->getContext()), 0), nullptr };
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
- Idxs[1] = ConstantInt::get(Type::Int32Ty, i);
- Value *Idx = GetElementPtrInst::Create(*AI, Idxs, Idxs+2,
+ Idxs[1] = ConstantInt::get(Type::getInt32Ty(F->getContext()), i);
+ Value *Idx = GetElementPtrInst::Create(*AI, Idxs,
(*AI)->getName()+"."+utostr(i),
Call);
// TODO: Tell AA about the new values?
// Non-dead argument: insert GEPs and loads as appropriate.
ScalarizeTable &ArgIndices = ScalarizedElements[I];
// Store the Value* version of the indices in here, but declare it now
- // for reuse
+ // for reuse.
std::vector<Value*> Ops;
for (ScalarizeTable::iterator SI = ArgIndices.begin(),
E = ArgIndices.end(); SI != E; ++SI) {
Value *V = *AI;
- LoadInst *OrigLoad = OriginalLoads[*SI];
+ LoadInst *OrigLoad = OriginalLoads[std::make_pair(I, *SI)];
if (!SI->empty()) {
Ops.reserve(SI->size());
- const Type *ElTy = V->getType();
+ Type *ElTy = V->getType();
for (IndicesVector::const_iterator II = SI->begin(),
IE = SI->end(); II != IE; ++II) {
// Use i32 to index structs, and i64 for others (pointers/arrays).
// This satisfies GEP constraints.
- const Type *IdxTy = (isa<StructType>(ElTy) ? Type::Int32Ty : Type::Int64Ty);
+ Type *IdxTy = (ElTy->isStructTy() ?
+ Type::getInt32Ty(F->getContext()) :
+ Type::getInt64Ty(F->getContext()));
Ops.push_back(ConstantInt::get(IdxTy, *II));
- // Keep track of the type we're currently indexing
+ // Keep track of the type we're currently indexing.
ElTy = cast<CompositeType>(ElTy)->getTypeAtIndex(*II);
}
- // And create a GEP to extract those indices
- V = GetElementPtrInst::Create(V, Ops.begin(), Ops.end(),
- V->getName()+".idx", Call);
+ // And create a GEP to extract those indices.
+ V = GetElementPtrInst::Create(V, Ops, V->getName()+".idx", Call);
Ops.clear();
AA.copyValue(OrigLoad->getOperand(0), V);
}
- Args.push_back(new LoadInst(V, V->getName()+".val", Call));
+ // Since we're replacing a load make sure we take the alignment
+ // of the previous load.
+ LoadInst *newLoad = new LoadInst(V, V->getName()+".val", Call);
+ newLoad->setAlignment(OrigLoad->getAlignment());
+ // Transfer the TBAA info too.
+ newLoad->setMetadata(LLVMContext::MD_tbaa,
+ OrigLoad->getMetadata(LLVMContext::MD_tbaa));
+ Args.push_back(newLoad);
AA.copyValue(OrigLoad, Args.back());
}
}
- if (ExtraArgHack)
- Args.push_back(Constant::getNullValue(Type::Int32Ty));
-
- // Push any varargs arguments on the list
+ // Push any varargs arguments on the list.
for (; AI != CS.arg_end(); ++AI, ++ArgIndex) {
Args.push_back(*AI);
- if (ParameterAttributes Attrs = CallPAL.getParamAttrs(ArgIndex))
- ParamAttrsVec.push_back(ParamAttrsWithIndex::get(Args.size(), Attrs));
+ if (CallPAL.hasAttributes(ArgIndex)) {
+ AttrBuilder B(CallPAL, ArgIndex);
+ AttributesVec.
+ push_back(AttributeSet::get(F->getContext(), Args.size(), B));
+ }
}
+ // Add any function attributes.
+ if (CallPAL.hasAttributes(AttributeSet::FunctionIndex))
+ AttributesVec.push_back(AttributeSet::get(Call->getContext(),
+ CallPAL.getFnAttributes()));
+
Instruction *New;
if (InvokeInst *II = dyn_cast<InvokeInst>(Call)) {
New = InvokeInst::Create(NF, II->getNormalDest(), II->getUnwindDest(),
- Args.begin(), Args.end(), "", Call);
+ Args, "", Call);
cast<InvokeInst>(New)->setCallingConv(CS.getCallingConv());
- cast<InvokeInst>(New)->setParamAttrs(PAListPtr::get(ParamAttrsVec.begin(),
- ParamAttrsVec.end()));
+ cast<InvokeInst>(New)->setAttributes(AttributeSet::get(II->getContext(),
+ AttributesVec));
} else {
- New = CallInst::Create(NF, Args.begin(), Args.end(), "", Call);
+ New = CallInst::Create(NF, Args, "", Call);
cast<CallInst>(New)->setCallingConv(CS.getCallingConv());
- cast<CallInst>(New)->setParamAttrs(PAListPtr::get(ParamAttrsVec.begin(),
- ParamAttrsVec.end()));
+ cast<CallInst>(New)->setAttributes(AttributeSet::get(New->getContext(),
+ AttributesVec));
if (cast<CallInst>(Call)->isTailCall())
cast<CallInst>(New)->setTailCall();
}
+ New->setDebugLoc(Call->getDebugLoc());
Args.clear();
- ParamAttrsVec.clear();
+ AttributesVec.clear();
// Update the alias analysis implementation to know that we are replacing
// the old call with a new one.
AA.replaceWithNewValue(Call, New);
// Update the callgraph to know that the callsite has been transformed.
- CG[Call->getParent()->getParent()]->replaceCallSite(Call, New);
+ CallGraphNode *CalleeNode = CG[Call->getParent()->getParent()];
+ CalleeNode->replaceCallEdge(Call, New, NF_CGN);
if (!Call->use_empty()) {
Call->replaceAllUsesWith(New);
// function empty.
NF->getBasicBlockList().splice(NF->begin(), F->getBasicBlockList());
- // Loop over the argument list, transfering uses of the old arguments over to
- // the new arguments, also transfering over the names as well.
+ // Loop over the argument list, transferring uses of the old arguments over to
+ // the new arguments, also transferring over the names as well.
//
for (Function::arg_iterator I = F->arg_begin(), E = F->arg_end(),
I2 = NF->arg_begin(); I != E; ++I) {
Instruction *InsertPt = NF->begin()->begin();
// Just add all the struct element types.
- const Type *AgTy = cast<PointerType>(I->getType())->getElementType();
- Value *TheAlloca = new AllocaInst(AgTy, 0, "", InsertPt);
- const StructType *STy = cast<StructType>(AgTy);
- Value *Idxs[2] = { ConstantInt::get(Type::Int32Ty, 0), 0 };
+ Type *AgTy = cast<PointerType>(I->getType())->getElementType();
+ Value *TheAlloca = new AllocaInst(AgTy, nullptr, "", InsertPt);
+ StructType *STy = cast<StructType>(AgTy);
+ Value *Idxs[2] = {
+ ConstantInt::get(Type::getInt32Ty(F->getContext()), 0), nullptr };
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
- Idxs[1] = ConstantInt::get(Type::Int32Ty, i);
- std::string Name = TheAlloca->getName()+"."+utostr(i);
- Value *Idx = GetElementPtrInst::Create(TheAlloca, Idxs, Idxs+2,
- Name, InsertPt);
- I2->setName(I->getName()+"."+utostr(i));
+ Idxs[1] = ConstantInt::get(Type::getInt32Ty(F->getContext()), i);
+ Value *Idx =
+ GetElementPtrInst::Create(TheAlloca, Idxs,
+ TheAlloca->getName()+"."+Twine(i),
+ InsertPt);
+ I2->setName(I->getName()+"."+Twine(i));
new StoreInst(I2++, Idx, InsertPt);
}
I->replaceAllUsesWith(TheAlloca);
TheAlloca->takeName(I);
AA.replaceWithNewValue(I, TheAlloca);
+
+ // If the alloca is used in a call, we must clear the tail flag since
+ // the callee now uses an alloca from the caller.
+ for (User *U : TheAlloca->users()) {
+ CallInst *Call = dyn_cast<CallInst>(U);
+ if (!Call)
+ continue;
+ Call->setTailCall(false);
+ }
continue;
}
ScalarizeTable &ArgIndices = ScalarizedElements[I];
while (!I->use_empty()) {
- if (LoadInst *LI = dyn_cast<LoadInst>(I->use_back())) {
+ if (LoadInst *LI = dyn_cast<LoadInst>(I->user_back())) {
assert(ArgIndices.begin()->empty() &&
"Load element should sort to front!");
I2->setName(I->getName()+".val");
LI->replaceAllUsesWith(I2);
AA.replaceWithNewValue(LI, I2);
LI->eraseFromParent();
- DOUT << "*** Promoted load of argument '" << I->getName()
- << "' in function '" << F->getName() << "'\n";
+ DEBUG(dbgs() << "*** Promoted load of argument '" << I->getName()
+ << "' in function '" << F->getName() << "'\n");
} else {
- GetElementPtrInst *GEP = cast<GetElementPtrInst>(I->use_back());
+ GetElementPtrInst *GEP = cast<GetElementPtrInst>(I->user_back());
IndicesVector Operands;
Operands.reserve(GEP->getNumIndices());
for (User::op_iterator II = GEP->idx_begin(), IE = GEP->idx_end();
NewName += ".val";
TheArg->setName(NewName);
- DOUT << "*** Promoted agg argument '" << TheArg->getName()
- << "' of function '" << NF->getName() << "'\n";
+ DEBUG(dbgs() << "*** Promoted agg argument '" << TheArg->getName()
+ << "' of function '" << NF->getName() << "'\n");
// All of the uses must be load instructions. Replace them all with
// the argument specified by ArgNo.
while (!GEP->use_empty()) {
- LoadInst *L = cast<LoadInst>(GEP->use_back());
+ LoadInst *L = cast<LoadInst>(GEP->user_back());
L->replaceAllUsesWith(TheArg);
AA.replaceWithNewValue(L, TheArg);
L->eraseFromParent();
}
// Increment I2 past all of the arguments added for this promoted pointer.
- for (unsigned i = 0, e = ArgIndices.size(); i != e; ++i)
- ++I2;
+ std::advance(I2, ArgIndices.size());
}
- // Notify the alias analysis implementation that we inserted a new argument.
- if (ExtraArgHack)
- AA.copyValue(Constant::getNullValue(Type::Int32Ty), NF->arg_begin());
-
-
// Tell the alias analysis that the old function is about to disappear.
AA.replaceWithNewValue(F, NF);
- // Now that the old function is dead, delete it.
- F->eraseFromParent();
- return NF;
+
+ NF_CGN->stealCalledFunctionsFrom(CG[F]);
+
+ // Now that the old function is dead, delete it. If there is a dangling
+ // reference to the CallgraphNode, just leave the dead function around for
+ // someone else to nuke.
+ CallGraphNode *CGN = CG[F];
+ if (CGN->getNumReferences() == 0)
+ delete CG.removeFunctionFromModule(CGN);
+ else
+ F->setLinkage(Function::ExternalLinkage);
+
+ return NF_CGN;
}