#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
+#include "llvm/Metadata.h"
+#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/ADT/DenseMap.h"
// assignments to subsections of the memory unit.
// Only allow direct and non-volatile loads and stores...
- for (Value::use_const_iterator UI = AI->use_begin(), UE = AI->use_end();
+ for (Value::const_use_iterator UI = AI->use_begin(), UE = AI->use_end();
UI != UE; ++UI) // Loop over all of the uses of the alloca
if (const LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
if (LI->isVolatile())
return true;
}
+/// FindAllocaDbgDeclare - Finds the llvm.dbg.declare intrinsic describing the
+/// alloca 'V', if any.
+static DbgDeclareInst *FindAllocaDbgDeclare(Value *V) {
+ if (MDNode *DebugNode = MDNode::getIfExists(V->getContext(), &V, 1))
+ for (Value::use_iterator UI = DebugNode->use_begin(),
+ E = DebugNode->use_end(); UI != E; ++UI)
+ if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(*UI))
+ return DDI;
+
+ return 0;
+}
+
namespace {
struct AllocaInfo;
std::vector<AllocaInst*> Allocas;
DominatorTree &DT;
DominanceFrontier &DF;
+ DIFactory *DIF;
/// AST - An AliasSetTracker object to update. If null, don't update it.
///
///
std::vector<Value*> PointerAllocaValues;
+ /// AllocaDbgDeclares - For each alloca, we keep track of the dbg.declare
+ /// intrinsic that describes it, if any, so that we can convert it to a
+ /// dbg.value intrinsic if the alloca gets promoted.
+ SmallVector<DbgDeclareInst*, 8> AllocaDbgDeclares;
+
/// Visited - The set of basic blocks the renamer has already visited.
///
SmallPtrSet<BasicBlock*, 16> Visited;
public:
PromoteMem2Reg(const std::vector<AllocaInst*> &A, DominatorTree &dt,
DominanceFrontier &df, AliasSetTracker *ast)
- : Allocas(A), DT(dt), DF(df), AST(ast) {}
+ : Allocas(A), DT(dt), DF(df), DIF(0), AST(ast) {}
+ ~PromoteMem2Reg() {
+ delete DIF;
+ }
void run();
LargeBlockInfo &LBI);
void PromoteSingleBlockAlloca(AllocaInst *AI, AllocaInfo &Info,
LargeBlockInfo &LBI);
+ void ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI, StoreInst *SI);
void RenamePass(BasicBlock *BB, BasicBlock *Pred,
bool OnlyUsedInOneBlock;
Value *AllocaPointerVal;
+ DbgDeclareInst *DbgDeclare;
void clear() {
DefiningBlocks.clear();
OnlyBlock = 0;
OnlyUsedInOneBlock = true;
AllocaPointerVal = 0;
+ DbgDeclare = 0;
}
/// AnalyzeAlloca - Scan the uses of the specified alloca, filling in our
OnlyUsedInOneBlock = false;
}
}
+
+ DbgDeclare = FindAllocaDbgDeclare(AI);
}
};
} // end of anonymous namespace
Function &F = *DF.getRoot()->getParent();
if (AST) PointerAllocaValues.resize(Allocas.size());
+ AllocaDbgDeclares.resize(Allocas.size());
AllocaInfo Info;
LargeBlockInfo LBI;
// Finally, after the scan, check to see if the store is all that is left.
if (Info.UsingBlocks.empty()) {
+ // Record debuginfo for the store and remove the declaration's debuginfo.
+ if (DbgDeclareInst *DDI = Info.DbgDeclare) {
+ ConvertDebugDeclareToDebugValue(DDI, Info.OnlyStore);
+ DDI->eraseFromParent();
+ }
// Remove the (now dead) store and alloca.
Info.OnlyStore->eraseFromParent();
LBI.deleteValue(Info.OnlyStore);
// Remove the (now dead) stores and alloca.
while (!AI->use_empty()) {
StoreInst *SI = cast<StoreInst>(AI->use_back());
+ // Record debuginfo for the store before removing it.
+ if (DbgDeclareInst *DDI = Info.DbgDeclare)
+ ConvertDebugDeclareToDebugValue(DDI, SI);
SI->eraseFromParent();
LBI.deleteValue(SI);
}
// The alloca has been processed, move on.
RemoveFromAllocasList(AllocaNum);
+ // The alloca's debuginfo can be removed as well.
+ if (DbgDeclareInst *DDI = Info.DbgDeclare)
+ DDI->eraseFromParent();
+
++NumLocalPromoted;
continue;
}
// stored into the alloca.
if (AST)
PointerAllocaValues[AllocaNum] = Info.AllocaPointerVal;
+
+ // Remember the dbg.declare intrinsic describing this alloca, if any.
+ if (Info.DbgDeclare) AllocaDbgDeclares[AllocaNum] = Info.DbgDeclare;
// Keep the reverse mapping of the 'Allocas' array for the rename pass.
AllocaLookup[Allocas[AllocaNum]] = AllocaNum;
A->eraseFromParent();
}
-
+ // Remove alloca's dbg.declare instrinsics from the function.
+ for (unsigned i = 0, e = AllocaDbgDeclares.size(); i != e; ++i)
+ if (DbgDeclareInst *DDI = AllocaDbgDeclares[i])
+ DDI->eraseFromParent();
+
// Loop over all of the PHI nodes and see if there are any that we can get
// rid of because they merge all of the same incoming values. This can
// happen due to undef values coming into the PHI nodes. This process is
// If this PHI node merges one value and/or undefs, get the value.
if (Value *V = PN->hasConstantValue(&DT)) {
- if (AST && isa<PointerType>(PN->getType()))
+ if (AST && PN->getType()->isPointerTy())
AST->deleteValue(PN);
PN->replaceAllUsesWith(V);
PN->eraseFromParent();
if (ReplVal == LI)
ReplVal = UndefValue::get(LI->getType());
LI->replaceAllUsesWith(ReplVal);
- if (AST && isa<PointerType>(LI->getType()))
+ if (AST && LI->getType()->isPointerTy())
AST->deleteValue(LI);
LI->eraseFromParent();
LBI.deleteValue(LI);
for (Value::use_iterator UI = AI->use_begin(), E = AI->use_end(); UI != E;)
if (LoadInst *LI = dyn_cast<LoadInst>(*UI++)) {
LI->replaceAllUsesWith(UndefValue::get(LI->getType()));
- if (AST && isa<PointerType>(LI->getType()))
+ if (AST && LI->getType()->isPointerTy())
AST->deleteValue(LI);
LBI.deleteValue(LI);
LI->eraseFromParent();
// Otherwise, there was a store before this load, the load takes its value.
--I;
LI->replaceAllUsesWith(I->second->getOperand(0));
- if (AST && isa<PointerType>(LI->getType()))
+ if (AST && LI->getType()->isPointerTy())
AST->deleteValue(LI);
LI->eraseFromParent();
LBI.deleteValue(LI);
}
}
+// Inserts a llvm.dbg.value instrinsic before the stores to an alloca'd value
+// that has an associated llvm.dbg.decl intrinsic.
+void PromoteMem2Reg::ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI,
+ StoreInst *SI) {
+ DIVariable DIVar(DDI->getVariable());
+ if (!DIVar.getNode())
+ return;
+
+ if (!DIF)
+ DIF = new DIFactory(*SI->getParent()->getParent()->getParent());
+ Instruction *DbgVal = DIF->InsertDbgValueIntrinsic(SI->getOperand(0), 0,
+ DIVar, SI);
+
+ // Propagate any debug metadata from the store onto the dbg.value.
+ if (MDNode *SIMD = SI->getMetadata("dbg"))
+ DbgVal->setMetadata("dbg", SIMD);
+}
// QueuePhiNode - queues a phi-node to be added to a basic-block for a specific
// Alloca returns true if there wasn't already a phi-node for that variable
InsertedPHINodes.insert(PN);
- if (AST && isa<PointerType>(PN->getType()))
+ if (AST && PN->getType()->isPointerTy())
AST->copyValue(PointerAllocaValues[AllocaNo], PN);
return true;
// Anything using the load now uses the current value.
LI->replaceAllUsesWith(V);
- if (AST && isa<PointerType>(LI->getType()))
+ if (AST && LI->getType()->isPointerTy())
AST->deleteValue(LI);
BB->getInstList().erase(LI);
} else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
// what value were we writing?
IncomingVals[ai->second] = SI->getOperand(0);
+ // Record debuginfo for the store before removing it.
+ if (DbgDeclareInst *DDI = AllocaDbgDeclares[ai->second])
+ ConvertDebugDeclareToDebugValue(DDI, SI);
BB->getInstList().erase(SI);
}
}
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