forked from OSchip/llvm-project
[DebugInfo] Use variadic debug values to salvage BinOps and GEP instrs with non-const operands
This patch improves salvageDebugInfoImpl by allowing it to salvage arithmetic operations with two or more non-const operands; this includes the GetElementPtr instruction, and most Binary Operator instructions. These salvages produce DIArgList locations and are only valid for dbg.values, as currently variadic DIExpressions must use DW_OP_stack_value. This functionality is also only added for salvageDebugInfoForDbgValues; other functions that directly call salvageDebugInfoImpl (such as in ISel or Coroutine frame building) can be updated in a later patch. Differential Revision: https://reviews.llvm.org/D91722
This commit is contained in:
gbtozers
Stephen Tozer
parent
ea834c8365
commit
c0f3dfb9f1
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@ -2583,6 +2583,16 @@ public:
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return Elements[I];
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}
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/// Return the number of unique location operands referred to (via
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/// DW_OP_LLVM_arg) in this expression; this is not necessarily the number of
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/// instances of DW_OP_LLVM_arg within the expression.
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/// For example, for the expression:
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/// (DW_OP_LLVM_arg 0, DW_OP_LLVM_arg 1, DW_OP_plus,
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/// DW_OP_LLVM_arg 0, DW_OP_mul)
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/// This function would return 2, as there are two unique location operands
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/// (0 and 1).
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uint64_t getNumLocationOperands() const;
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/// Determine whether this represents a standalone constant value.
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bool isConstant() const;
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@ -2731,6 +2741,10 @@ public:
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/// return true with an offset of zero.
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bool extractIfOffset(int64_t &Offset) const;
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/// Returns true iff this DIExpression contains at least one instance of
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/// `DW_OP_LLVM_arg, n` for all n in [0, N).
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bool hasAllLocationOps(unsigned N) const;
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/// Checks if the last 4 elements of the expression are DW_OP_constu <DWARF
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/// Address Space> DW_OP_swap DW_OP_xderef and extracts the <DWARF Address
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/// Space>.
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@ -1122,7 +1122,9 @@ public:
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/// must be at least as wide as the IntPtr type for the address space of
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/// the base GEP pointer.
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bool accumulateConstantOffset(const DataLayout &DL, APInt &Offset) const;
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bool collectOffset(const DataLayout &DL, unsigned BitWidth,
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SmallDenseMap<Value *, APInt, 8> &VariableOffsets,
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APInt &ConstantOffset) const;
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static bool classof(const Instruction *I) {
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return (I->getOpcode() == Instruction::GetElementPtr);
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@ -204,6 +204,11 @@ public:
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void replaceVariableLocationOp(Value *OldValue, Value *NewValue);
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void replaceVariableLocationOp(unsigned OpIdx, Value *NewValue);
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/// Adding a new location operand will always result in this intrinsic using
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/// an ArgList, and must always be accompanied by a new expression that uses
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/// the new operand.
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void addVariableLocationOps(ArrayRef<Value *> NewValues,
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DIExpression *NewExpr);
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void setVariable(DILocalVariable *NewVar) {
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setArgOperand(1, MetadataAsValue::get(NewVar->getContext(), NewVar));
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@ -576,6 +576,12 @@ public:
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Type *SourceType, ArrayRef<const Value *> Index, const DataLayout &DL,
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APInt &Offset,
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function_ref<bool(Value &, APInt &)> ExternalAnalysis = nullptr);
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/// Collect the offset of this GEP as a map of Values to their associated
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/// APInt multipliers, as well as a total Constant Offset.
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bool collectOffset(const DataLayout &DL, unsigned BitWidth,
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SmallDenseMap<Value *, APInt, 8> &VariableOffsets,
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APInt &ConstantOffset) const;
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};
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class PtrToIntOperator
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@ -314,7 +314,8 @@ void salvageDebugInfoForDbgValues(Instruction &I,
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/// appended to the expression. \p LocNo: the index of the location operand to
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/// which \p I applies, should be 0 for debug info without a DIArgList.
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DIExpression *salvageDebugInfoImpl(Instruction &I, DIExpression *DIExpr,
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bool StackVal, unsigned LocNo);
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bool StackVal, unsigned LocNo,
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SmallVectorImpl<Value *> &AdditionalValues);
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/// Point debug users of \p From to \p To or salvage them. Use this function
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/// only when replacing all uses of \p From with \p To, with a guarantee that
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@ -1229,6 +1229,10 @@ void SelectionDAGBuilder::resolveDanglingDebugInfo(const Value *V,
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}
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void SelectionDAGBuilder::salvageUnresolvedDbgValue(DanglingDebugInfo &DDI) {
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// TODO: For the variadic implementation, instead of only checking the fail
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// state of `handleDebugValue`, we need know specifically which values were
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// invalid, so that we attempt to salvage only those values when processing
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// a DIArgList.
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assert(!DDI.getDI()->hasArgList() &&
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"Not implemented for variadic dbg_values");
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Value *V = DDI.getDI()->getValue(0);
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@ -1252,16 +1256,21 @@ void SelectionDAGBuilder::salvageUnresolvedDbgValue(DanglingDebugInfo &DDI) {
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while (isa<Instruction>(V)) {
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Instruction &VAsInst = *cast<Instruction>(V);
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// Temporary "0", awaiting real implementation.
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DIExpression *NewExpr = salvageDebugInfoImpl(VAsInst, Expr, StackValue, 0);
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SmallVector<Value *, 4> AdditionalValues;
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DIExpression *SalvagedExpr =
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salvageDebugInfoImpl(VAsInst, Expr, StackValue, 0, AdditionalValues);
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// If we cannot salvage any further, and haven't yet found a suitable debug
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// expression, bail out.
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if (!NewExpr)
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// TODO: If AdditionalValues isn't empty, then the salvage can only be
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// represented with a DBG_VALUE_LIST, so we give up. When we have support
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// here for variadic dbg_values, remove that condition.
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if (!SalvagedExpr || !AdditionalValues.empty())
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break;
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// New value and expr now represent this debuginfo.
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V = VAsInst.getOperand(0);
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Expr = NewExpr;
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Expr = SalvagedExpr;
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// Some kind of simplification occurred: check whether the operand of the
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// salvaged debug expression can be encoded in this DAG.
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@ -1236,6 +1236,17 @@ bool DIExpression::extractIfOffset(int64_t &Offset) const {
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return false;
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}
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bool DIExpression::hasAllLocationOps(unsigned N) const {
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SmallDenseSet<uint64_t, 4> SeenOps;
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for (auto ExprOp : expr_ops())
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if (ExprOp.getOp() == dwarf::DW_OP_LLVM_arg)
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SeenOps.insert(ExprOp.getArg(0));
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for (uint64_t Idx = 0; Idx < N; ++Idx)
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if (!is_contained(SeenOps, Idx))
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return false;
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return true;
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}
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const DIExpression *DIExpression::extractAddressClass(const DIExpression *Expr,
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unsigned &AddrClass) {
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// FIXME: This seems fragile. Nothing that verifies that these elements
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@ -1450,6 +1461,16 @@ Optional<DIExpression *> DIExpression::createFragmentExpression(
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return DIExpression::get(Expr->getContext(), Ops);
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}
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uint64_t DIExpression::getNumLocationOperands() const {
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uint64_t Result = 0;
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for (auto ExprOp : expr_ops())
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if (ExprOp.getOp() == dwarf::DW_OP_LLVM_arg)
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Result = std::max(Result, ExprOp.getArg(0) + 1);
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assert(hasAllLocationOps(Result) &&
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"Expression is missing one or more location operands.");
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return Result;
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}
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bool DIExpression::isConstant() const {
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// Recognize DW_OP_constu C DW_OP_stack_value (DW_OP_LLVM_fragment Len Ofs)?.
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if (getNumElements() != 3 && getNumElements() != 6)
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@ -1793,6 +1793,15 @@ bool GetElementPtrInst::accumulateConstantOffset(const DataLayout &DL,
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return cast<GEPOperator>(this)->accumulateConstantOffset(DL, Offset);
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}
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bool GetElementPtrInst::collectOffset(
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const DataLayout &DL, unsigned BitWidth,
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SmallDenseMap<Value *, APInt, 8> &VariableOffsets,
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APInt &ConstantOffset) const {
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// Delegate to the generic GEPOperator implementation.
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return cast<GEPOperator>(this)->collectOffset(DL, BitWidth, VariableOffsets,
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ConstantOffset);
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}
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//===----------------------------------------------------------------------===//
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// ExtractElementInst Implementation
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//===----------------------------------------------------------------------===//
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@ -117,6 +117,23 @@ void DbgVariableIntrinsic::replaceVariableLocationOp(unsigned OpIdx,
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0, MetadataAsValue::get(getContext(), DIArgList::get(getContext(), MDs)));
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}
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void DbgVariableIntrinsic::addVariableLocationOps(ArrayRef<Value *> NewValues,
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DIExpression *NewExpr) {
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assert(NewExpr->hasAllLocationOps(getNumVariableLocationOps() +
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NewValues.size()) &&
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"NewExpr for debug variable intrinsic does not reference every "
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"location operand.");
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assert(!is_contained(NewValues, nullptr) && "New values must be non-null");
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setArgOperand(2, MetadataAsValue::get(getContext(), NewExpr));
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SmallVector<ValueAsMetadata *, 4> MDs;
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for (auto *VMD : location_ops())
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MDs.push_back(getAsMetadata(VMD));
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for (auto *VMD : NewValues)
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MDs.push_back(getAsMetadata(VMD));
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setArgOperand(
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0, MetadataAsValue::get(getContext(), DIArgList::get(getContext(), MDs)));
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}
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Optional<uint64_t> DbgVariableIntrinsic::getFragmentSizeInBits() const {
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if (auto Fragment = getExpression()->getFragmentInfo())
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return Fragment->SizeInBits;
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@ -142,4 +142,61 @@ bool GEPOperator::accumulateConstantOffset(
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}
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return true;
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}
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bool GEPOperator::collectOffset(
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const DataLayout &DL, unsigned BitWidth,
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SmallDenseMap<Value *, APInt, 8> &VariableOffsets,
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APInt &ConstantOffset) const {
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assert(BitWidth == DL.getIndexSizeInBits(getPointerAddressSpace()) &&
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"The offset bit width does not match DL specification.");
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auto CollectConstantOffset = [&](APInt Index, uint64_t Size) {
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Index = Index.sextOrTrunc(BitWidth);
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APInt IndexedSize = APInt(BitWidth, Size);
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ConstantOffset += Index * IndexedSize;
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};
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for (gep_type_iterator GTI = gep_type_begin(this), GTE = gep_type_end(this);
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GTI != GTE; ++GTI) {
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// Scalable vectors are multiplied by a runtime constant.
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bool ScalableType = isa<ScalableVectorType>(GTI.getIndexedType());
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Value *V = GTI.getOperand();
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StructType *STy = GTI.getStructTypeOrNull();
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// Handle ConstantInt if possible.
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if (auto ConstOffset = dyn_cast<ConstantInt>(V)) {
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if (ConstOffset->isZero())
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continue;
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// If the type is scalable and the constant is not zero (vscale * n * 0 =
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// 0) bailout.
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// TODO: If the runtime value is accessible at any point before DWARF
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// emission, then we could potentially keep a forward reference to it
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// in the debug value to be filled in later.
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if (ScalableType)
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return false;
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// Handle a struct index, which adds its field offset to the pointer.
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if (STy) {
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unsigned ElementIdx = ConstOffset->getZExtValue();
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const StructLayout *SL = DL.getStructLayout(STy);
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// Element offset is in bytes.
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CollectConstantOffset(APInt(BitWidth, SL->getElementOffset(ElementIdx)),
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1);
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continue;
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}
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CollectConstantOffset(ConstOffset->getValue(),
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DL.getTypeAllocSize(GTI.getIndexedType()));
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continue;
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}
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if (STy || ScalableType)
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return false;
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// Insert an initial offset of 0 for V iff none exists already, then
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// increment the offset by IndexedSize.
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VariableOffsets.try_emplace(V, BitWidth, 0);
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APInt IndexedSize =
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APInt(BitWidth, DL.getTypeAllocSize(GTI.getIndexedType()));
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VariableOffsets[V] += IndexedSize;
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}
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return true;
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}
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} // namespace llvm
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@ -2172,10 +2172,15 @@ void coro::salvageDebugInfo(
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} else if (auto *StInst = dyn_cast<StoreInst>(Storage)) {
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Storage = StInst->getOperand(0);
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} else if (auto *GEPInst = dyn_cast<GetElementPtrInst>(Storage)) {
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Expr = llvm::salvageDebugInfoImpl(*GEPInst, Expr,
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/*WithStackValue=*/false, 0);
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if (!Expr)
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return;
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SmallVector<Value *> AdditionalValues;
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DIExpression *SalvagedExpr = llvm::salvageDebugInfoImpl(
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*GEPInst, Expr,
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/*WithStackValue=*/false, 0, AdditionalValues);
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// Debug declares cannot currently handle additional location
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// operands.
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if (!SalvagedExpr || !AdditionalValues.empty())
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break;
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Expr = SalvagedExpr;
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Storage = GEPInst->getOperand(0);
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} else if (auto *BCInst = dyn_cast<llvm::BitCastInst>(Storage))
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Storage = BCInst->getOperand(0);
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@ -1812,17 +1812,26 @@ void llvm::salvageDebugInfoForDbgValues(
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is_contained(DIILocation, &I) &&
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"DbgVariableIntrinsic must use salvaged instruction as its location");
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unsigned LocNo = std::distance(DIILocation.begin(), find(DIILocation, &I));
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DIExpression *DIExpr =
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salvageDebugInfoImpl(I, DII->getExpression(), StackValue, LocNo);
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SmallVector<Value *, 4> AdditionalValues;
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DIExpression *SalvagedExpr = salvageDebugInfoImpl(
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I, DII->getExpression(), StackValue, LocNo, AdditionalValues);
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// salvageDebugInfoImpl should fail on examining the first element of
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// DbgUsers, or none of them.
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if (!DIExpr)
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if (!SalvagedExpr)
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break;
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DII->replaceVariableLocationOp(&I, I.getOperand(0));
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DII->setExpression(DIExpr);
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if (AdditionalValues.empty()) {
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DII->setExpression(SalvagedExpr);
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} else if (isa<DbgValueInst>(DII)) {
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DII->addVariableLocationOps(AdditionalValues, SalvagedExpr);
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} else {
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// Do not salvage using DIArgList for dbg.addr/dbg.declare, as it is
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// currently only valid for stack value expressions.
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Value *Undef = UndefValue::get(I.getOperand(0)->getType());
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DII->replaceVariableLocationOp(I.getOperand(0), Undef);
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}
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LLVM_DEBUG(dbgs() << "SALVAGE: " << *DII << '\n');
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Salvaged = true;
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}
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@ -1837,12 +1846,27 @@ void llvm::salvageDebugInfoForDbgValues(
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}
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bool getSalvageOpsForGEP(GetElementPtrInst *GEP, const DataLayout &DL,
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SmallVectorImpl<uint64_t> &Opcodes) {
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uint64_t CurrentLocOps,
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SmallVectorImpl<uint64_t> &Opcodes,
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SmallVectorImpl<Value *> &AdditionalValues) {
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unsigned BitWidth = DL.getIndexSizeInBits(GEP->getPointerAddressSpace());
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// Rewrite a constant GEP into a DIExpression.
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// Rewrite a GEP into a DIExpression.
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SmallDenseMap<Value *, APInt, 8> VariableOffsets;
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APInt ConstantOffset(BitWidth, 0);
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if (!GEP->accumulateConstantOffset(DL, ConstantOffset))
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if (!GEP->collectOffset(DL, BitWidth, VariableOffsets, ConstantOffset))
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return false;
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if (!VariableOffsets.empty() && !CurrentLocOps) {
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Opcodes.insert(Opcodes.begin(), {dwarf::DW_OP_LLVM_arg, 0});
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CurrentLocOps = 1;
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}
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for (auto Offset : VariableOffsets) {
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AdditionalValues.push_back(Offset.first);
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assert(Offset.second.isStrictlyPositive() &&
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"Expected strictly positive multiplier for offset.");
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Opcodes.append({dwarf::DW_OP_LLVM_arg, CurrentLocOps++, dwarf::DW_OP_constu,
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Offset.second.getZExtValue(), dwarf::DW_OP_mul,
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dwarf::DW_OP_plus});
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}
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DIExpression::appendOffset(Opcodes, ConstantOffset.getSExtValue());
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return true;
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}
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@ -1877,23 +1901,35 @@ uint64_t getDwarfOpForBinOp(Instruction::BinaryOps Opcode) {
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}
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}
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bool getSalvageOpsForBinOp(BinaryOperator *BI,
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SmallVectorImpl<uint64_t> &Opcodes) {
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// Rewrite binary operations with constant integer operands.
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bool getSalvageOpsForBinOp(BinaryOperator *BI, uint64_t CurrentLocOps,
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SmallVectorImpl<uint64_t> &Opcodes,
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SmallVectorImpl<Value *> &AdditionalValues) {
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// Handle binary operations with constant integer operands as a special case.
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auto *ConstInt = dyn_cast<ConstantInt>(BI->getOperand(1));
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if (!ConstInt || ConstInt->getBitWidth() > 64)
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// Values wider than 64 bits cannot be represented within a DIExpression.
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if (ConstInt && ConstInt->getBitWidth() > 64)
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return false;
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uint64_t Val = ConstInt->getSExtValue();
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Instruction::BinaryOps BinOpcode = BI->getOpcode();
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// Add or Sub Instructions with a constant operand can potentially be
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// simplified.
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if (BinOpcode == Instruction::Add || BinOpcode == Instruction::Sub) {
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uint64_t Offset = BinOpcode == Instruction::Add ? Val : -int64_t(Val);
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DIExpression::appendOffset(Opcodes, Offset);
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return true;
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// Push any Constant Int operand onto the expression stack.
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if (ConstInt) {
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uint64_t Val = ConstInt->getSExtValue();
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// Add or Sub Instructions with a constant operand can potentially be
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// simplified.
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if (BinOpcode == Instruction::Add || BinOpcode == Instruction::Sub) {
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uint64_t Offset = BinOpcode == Instruction::Add ? Val : -int64_t(Val);
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DIExpression::appendOffset(Opcodes, Offset);
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return true;
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}
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Opcodes.append({dwarf::DW_OP_constu, Val});
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} else {
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if (!CurrentLocOps) {
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Opcodes.append({dwarf::DW_OP_LLVM_arg, 0});
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CurrentLocOps = 1;
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}
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Opcodes.append({dwarf::DW_OP_LLVM_arg, CurrentLocOps});
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AdditionalValues.push_back(BI->getOperand(1));
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}
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// Add constant int operand to expression stack.
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Opcodes.append({dwarf::DW_OP_constu, Val});
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// Add salvaged binary operator to expression stack, if it has a valid
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// representation in a DIExpression.
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@ -1905,9 +1941,11 @@ bool getSalvageOpsForBinOp(BinaryOperator *BI,
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return true;
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}
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DIExpression *llvm::salvageDebugInfoImpl(Instruction &I,
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DIExpression *SrcDIExpr,
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bool WithStackValue, unsigned LocNo) {
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DIExpression *
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llvm::salvageDebugInfoImpl(Instruction &I, DIExpression *SrcDIExpr,
|
||||
bool WithStackValue, unsigned LocNo,
|
||||
SmallVectorImpl<Value *> &AdditionalValues) {
|
||||
uint64_t CurrentLocOps = SrcDIExpr->getNumLocationOperands();
|
||||
auto &M = *I.getModule();
|
||||
auto &DL = M.getDataLayout();
|
||||
|
||||
|
|
@ -1921,7 +1959,7 @@ DIExpression *llvm::salvageDebugInfoImpl(Instruction &I,
|
|||
};
|
||||
|
||||
// initializer-list helper for applying operators to the source DIExpression.
|
||||
auto applyOps = [&](ArrayRef<uint64_t> Opcodes) -> DIExpression * {
|
||||
auto applyOps = [&](ArrayRef<uint64_t> Opcodes) {
|
||||
SmallVector<uint64_t, 8> Ops(Opcodes.begin(), Opcodes.end());
|
||||
return doSalvage(Ops);
|
||||
};
|
||||
|
|
@ -1947,15 +1985,15 @@ DIExpression *llvm::salvageDebugInfoImpl(Instruction &I,
|
|||
|
||||
SmallVector<uint64_t, 8> Ops;
|
||||
if (auto *GEP = dyn_cast<GetElementPtrInst>(&I)) {
|
||||
if (getSalvageOpsForGEP(GEP, DL, Ops))
|
||||
if (getSalvageOpsForGEP(GEP, DL, CurrentLocOps, Ops, AdditionalValues))
|
||||
return doSalvage(Ops);
|
||||
} else if (auto *BI = dyn_cast<BinaryOperator>(&I)) {
|
||||
if (getSalvageOpsForBinOp(BI, Ops))
|
||||
if (getSalvageOpsForBinOp(BI, CurrentLocOps, Ops, AdditionalValues))
|
||||
return doSalvage(Ops);
|
||||
}
|
||||
// *Not* to do: we should not attempt to salvage load instructions,
|
||||
// because the validity and lifetime of a dbg.value containing
|
||||
// DW_OP_deref becomes difficult to analyze. See PR40628 for examples.
|
||||
// *Not* to do: we should not attempt to salvage load instructions,
|
||||
// because the validity and lifetime of a dbg.value containing
|
||||
// DW_OP_deref becomes difficult to analyze. See PR40628 for examples.
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -702,12 +702,12 @@ if.end: ; preds = %if.then, %entry
|
|||
; CHECK-NEXT: }
|
||||
; CHECK-NEXT: .section .debug_info
|
||||
; CHECK-NEXT: {
|
||||
; CHECK-NEXT:.b32 10029 // Length of Unit
|
||||
; CHECK-NEXT:.b32 10034 // Length of Unit
|
||||
; CHECK-NEXT:.b8 2 // DWARF version number
|
||||
; CHECK-NEXT:.b8 0
|
||||
; CHECK-NEXT:.b32 .debug_abbrev // Offset Into Abbrev. Section
|
||||
; CHECK-NEXT:.b8 8 // Address Size (in bytes)
|
||||
; CHECK-NEXT:.b8 1 // Abbrev [1] 0xb:0x2726 DW_TAG_compile_unit
|
||||
; CHECK-NEXT:.b8 1 // Abbrev [1] 0xb:0x272b DW_TAG_compile_unit
|
||||
; CHECK-NEXT:.b8 0 // DW_AT_producer
|
||||
; CHECK-NEXT:.b8 4 // DW_AT_language
|
||||
; CHECK-NEXT:.b8 0
|
||||
|
|
@ -8306,7 +8306,7 @@ if.end: ; preds = %if.then, %entry
|
|||
; CHECK-NEXT:.b8 3 // DW_AT_decl_line
|
||||
; CHECK-NEXT:.b32 3345 // DW_AT_type
|
||||
; CHECK-NEXT:.b8 0 // End Of Children Mark
|
||||
; CHECK-NEXT:.b8 40 // Abbrev [40] 0x2671:0xbf DW_TAG_subprogram
|
||||
; CHECK-NEXT:.b8 40 // Abbrev [40] 0x2671:0xc4 DW_TAG_subprogram
|
||||
; CHECK-NEXT:.b64 Lfunc_begin0 // DW_AT_low_pc
|
||||
; CHECK-NEXT:.b64 Lfunc_end0 // DW_AT_high_pc
|
||||
; CHECK-NEXT:.b8 1 // DW_AT_frame_base
|
||||
|
|
@ -8386,7 +8386,7 @@ if.end: ; preds = %if.then, %entry
|
|||
; CHECK-NEXT:.b8 12 // DW_AT_call_file
|
||||
; CHECK-NEXT:.b8 6 // DW_AT_call_line
|
||||
; CHECK-NEXT:.b8 37 // DW_AT_call_column
|
||||
; CHECK-NEXT:.b8 43 // Abbrev [43] 0x2711:0x1e DW_TAG_inlined_subroutine
|
||||
; CHECK-NEXT:.b8 43 // Abbrev [43] 0x2711:0x23 DW_TAG_inlined_subroutine
|
||||
; CHECK-NEXT:.b32 9791 // DW_AT_abstract_origin
|
||||
; CHECK-NEXT:.b64 Ltmp9 // DW_AT_low_pc
|
||||
; CHECK-NEXT:.b64 Ltmp10 // DW_AT_high_pc
|
||||
|
|
@ -8395,6 +8395,8 @@ if.end: ; preds = %if.then, %entry
|
|||
; CHECK-NEXT:.b8 5 // DW_AT_call_column
|
||||
; CHECK-NEXT:.b8 44 // Abbrev [44] 0x2729:0x5 DW_TAG_formal_parameter
|
||||
; CHECK-NEXT:.b32 9820 // DW_AT_abstract_origin
|
||||
; CHECK-NEXT:.b8 44 // Abbrev [44] 0x272e:0x5 DW_TAG_formal_parameter
|
||||
; CHECK-NEXT:.b32 9829 // DW_AT_abstract_origin
|
||||
; CHECK-NEXT:.b8 0 // End Of Children Mark
|
||||
; CHECK-NEXT:.b8 0 // End Of Children Mark
|
||||
; CHECK-NEXT:.b8 0 // End Of Children Mark
|
||||
|
|
|
|||
|
|
@ -0,0 +1,56 @@
|
|||
; RUN: opt %s -dce -S | FileCheck %s
|
||||
|
||||
; Tests the salvaging of GEP instructions, specifically struct indexing and
|
||||
; non-constant array indexing.
|
||||
|
||||
%struct.S = type { i32, i32 }
|
||||
|
||||
; CHECK: call void @llvm.dbg.value(metadata !DIArgList(%struct.S* %ptr, i64 %offset),
|
||||
; CHECK-SAME: ![[VAR_OFFSET_PTR:[0-9]+]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_constu, 8, DW_OP_mul, DW_OP_plus, DW_OP_plus_uconst, 4, DW_OP_stack_value))
|
||||
|
||||
; CHECK: ![[VAR_OFFSET_PTR]] = !DILocalVariable(name: "offset_ptr"
|
||||
|
||||
define void @"?foo@@YAXPEAUS@@_J@Z"(%struct.S* %ptr, i64 %offset) !dbg !8 {
|
||||
entry:
|
||||
call void @llvm.dbg.value(metadata i64 %offset, metadata !20, metadata !DIExpression()), !dbg !24
|
||||
call void @llvm.dbg.value(metadata %struct.S* %ptr, metadata !21, metadata !DIExpression()), !dbg !24
|
||||
%arrayidx = getelementptr inbounds %struct.S, %struct.S* %ptr, i64 %offset, !dbg !25
|
||||
%b = getelementptr inbounds %struct.S, %struct.S* %arrayidx, i32 0, i32 1, !dbg !25
|
||||
call void @llvm.dbg.value(metadata i32* %b, metadata !22, metadata !DIExpression()), !dbg !24
|
||||
ret void, !dbg !26
|
||||
}
|
||||
|
||||
declare void @llvm.dbg.value(metadata, metadata, metadata)
|
||||
|
||||
!llvm.dbg.cu = !{!0}
|
||||
!llvm.module.flags = !{!3, !4, !5, !6}
|
||||
!llvm.ident = !{!7}
|
||||
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
|
||||
!1 = !DIFile(filename: "salvage-gep.cpp", directory: "/")
|
||||
!2 = !{}
|
||||
!3 = !{i32 2, !"CodeView", i32 1}
|
||||
!4 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!5 = !{i32 1, !"wchar_size", i32 2}
|
||||
!6 = !{i32 7, !"PIC Level", i32 2}
|
||||
!7 = !{!"clang version 11.0.0"}
|
||||
!8 = distinct !DISubprogram(name: "foo", linkageName: "?foo@@YAXPEAUS@@_J@Z", scope: !9, file: !9, line: 7, type: !10, scopeLine: 7, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !19)
|
||||
!9 = !DIFile(filename: ".\\salvage-gep.cpp", directory: "/")
|
||||
!10 = !DISubroutineType(types: !11)
|
||||
!11 = !{null, !12, !18}
|
||||
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
|
||||
!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !9, line: 2, size: 64, flags: DIFlagTypePassByValue, elements: !14, identifier: ".?AUS@@")
|
||||
!14 = !{!15, !17}
|
||||
!15 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !13, file: !9, line: 3, baseType: !16, size: 32)
|
||||
!16 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!17 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !13, file: !9, line: 4, baseType: !16, size: 32, offset: 32)
|
||||
!18 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
|
||||
!19 = !{!20, !21, !22}
|
||||
!20 = !DILocalVariable(name: "offset", arg: 2, scope: !8, file: !9, line: 7, type: !18)
|
||||
!21 = !DILocalVariable(name: "ptr", arg: 1, scope: !8, file: !9, line: 7, type: !12)
|
||||
!22 = !DILocalVariable(name: "offset_ptr", scope: !8, file: !9, line: 8, type: !23)
|
||||
!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64)
|
||||
!24 = !DILocation(line: 0, scope: !8)
|
||||
!25 = !DILocation(line: 8, scope: !8)
|
||||
!26 = !DILocation(line: 9, scope: !8)
|
||||
|
|
@ -0,0 +1,45 @@
|
|||
; RUN: opt %s -dce -S | FileCheck %s
|
||||
|
||||
; Tests the salvaging of binary operators that use more than one non-constant
|
||||
; SSA value.
|
||||
|
||||
; CHECK: call void @llvm.dbg.value(metadata !DIArgList(i32 %a, i32 %b),
|
||||
; CHECK-SAME: ![[VAR_C:[0-9]+]],
|
||||
; CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_stack_value))
|
||||
|
||||
; CHECK: ![[VAR_C]] = !DILocalVariable(name: "c"
|
||||
|
||||
define i32 @"?multiply@@YAHHH@Z"(i32 %a, i32 %b) !dbg !8 {
|
||||
entry:
|
||||
call void @llvm.dbg.value(metadata i32 %b, metadata !12, metadata !DIExpression()), !dbg !13
|
||||
call void @llvm.dbg.value(metadata i32 %a, metadata !14, metadata !DIExpression()), !dbg !13
|
||||
%add = add nsw i32 %a, %b, !dbg !15
|
||||
call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !13
|
||||
%mul = mul nsw i32 %a, %b, !dbg !17
|
||||
ret i32 %mul, !dbg !17
|
||||
}
|
||||
|
||||
declare void @llvm.dbg.value(metadata, metadata, metadata)
|
||||
|
||||
!llvm.dbg.cu = !{!0}
|
||||
!llvm.module.flags = !{!3, !4, !5, !6}
|
||||
!llvm.ident = !{!7}
|
||||
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 11.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
|
||||
!1 = !DIFile(filename: "test.cpp", directory: "/")
|
||||
!2 = !{}
|
||||
!3 = !{i32 2, !"CodeView", i32 1}
|
||||
!4 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!5 = !{i32 1, !"wchar_size", i32 2}
|
||||
!6 = !{i32 7, !"PIC Level", i32 2}
|
||||
!7 = !{!"clang version 11.0.0"}
|
||||
!8 = distinct !DISubprogram(name: "multiply", linkageName: "?multiply@@YAHHH@Z", scope: !1, file: !1, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
|
||||
!9 = !DISubroutineType(types: !10)
|
||||
!10 = !{!11, !11, !11}
|
||||
!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!12 = !DILocalVariable(name: "b", arg: 2, scope: !8, file: !1, line: 1, type: !11)
|
||||
!13 = !DILocation(line: 0, scope: !8)
|
||||
!14 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 1, type: !11)
|
||||
!15 = !DILocation(line: 2, scope: !8)
|
||||
!16 = !DILocalVariable(name: "c", scope: !8, file: !1, line: 2, type: !11)
|
||||
!17 = !DILocation(line: 3, scope: !8)
|
||||
|
|
@ -33,23 +33,25 @@ sink1:
|
|||
; value range.
|
||||
|
||||
; CHECK-LABEL: define i32 @bar(
|
||||
; CHECK: call void @llvm.dbg.value(metadata i32* undef,
|
||||
; CHECK: call void @llvm.dbg.value(metadata <vscale x 4 x i32>* undef,
|
||||
; CHECK-NEXT: br label %sink2
|
||||
|
||||
define i32 @bar(i32 *%a, i32 %b) !dbg !70 {
|
||||
define i32 @bar(<vscale x 4 x i32>* %a, i32 %b) !dbg !70 {
|
||||
entry:
|
||||
%gep = getelementptr i32, i32 *%a, i32 %b
|
||||
call void @llvm.dbg.value(metadata i32* %gep, metadata !73, metadata !12), !dbg !74
|
||||
%gep = getelementptr <vscale x 4 x i32>, <vscale x 4 x i32>* %a, i32 %b
|
||||
call void @llvm.dbg.value(metadata <vscale x 4 x i32>* %gep, metadata !73, metadata !12), !dbg !74
|
||||
br label %sink2
|
||||
|
||||
sink2:
|
||||
; CHECK-LABEL: sink2:
|
||||
; CHECK: call void @llvm.dbg.value(metadata i32* %gep,
|
||||
; CHECK: call void @llvm.dbg.value(metadata <vscale x 4 x i32>* %gep,
|
||||
; CHECK-SAME: metadata !{{[0-9]+}}, metadata !DIExpression())
|
||||
; CHECK-NEXT: load
|
||||
; CHECK-NEXT: extractelement
|
||||
; CHECK-NEXT: ret
|
||||
%0 = load i32, i32* %gep
|
||||
ret i32 %0
|
||||
%0 = load <vscale x 4 x i32>, <vscale x 4 x i32>* %gep
|
||||
%extract = extractelement <vscale x 4 x i32> %0, i32 1
|
||||
ret i32 %extract
|
||||
}
|
||||
|
||||
; This GEP is sunk, and has multiple debug uses in the same block. Check that
|
||||
|
|
|
|||
|
|
@ -1,95 +1,73 @@
|
|||
; RUN: opt < %s -reassociate -S | FileCheck %s
|
||||
; RUN: opt < %s -reassociate -S | FileCheck %s
|
||||
|
||||
; Check that reassociate pass now undefs debug intrinsics that reference a value
|
||||
; that gets dropped and cannot be salvaged.
|
||||
|
||||
; CHECK-NOT: %add = fadd fast float %a, %b
|
||||
; CHECK: call void @llvm.dbg.value(metadata float undef, metadata [[VAR_X:![0-9]+]], metadata !DIExpression())
|
||||
|
||||
; CHECK-LABEL: if.then:
|
||||
; CHECK-NOT: %add1 = fadd fast float %add, %c
|
||||
; CHECK: call void @llvm.dbg.value(metadata float undef, metadata [[VAR_Y:![0-9]+]], metadata !DIExpression())
|
||||
; CHECK-LABEL: !0 =
|
||||
; CHECK-DAG: [[VAR_Y]] = !DILocalVariable(name: "y"
|
||||
; CHECK-DAG: [[VAR_X]] = !DILocalVariable(name: "x"
|
||||
|
||||
define float @"?foo@@YAMMMMM@Z"(float %a, float %b, float %c, float %d) !dbg !8 {
|
||||
entry:
|
||||
call void @llvm.dbg.value(metadata float %d, metadata !12, metadata !DIExpression()), !dbg !13
|
||||
call void @llvm.dbg.value(metadata float %c, metadata !14, metadata !DIExpression()), !dbg !13
|
||||
call void @llvm.dbg.value(metadata float %b, metadata !15, metadata !DIExpression()), !dbg !13
|
||||
call void @llvm.dbg.value(metadata float %a, metadata !16, metadata !DIExpression()), !dbg !13
|
||||
%add = fadd fast float %a, %b, !dbg !17
|
||||
call void @llvm.dbg.value(metadata float %add, metadata !18, metadata !DIExpression()), !dbg !13
|
||||
%cmp = fcmp fast oeq float %d, 4.000000e+00, !dbg !19
|
||||
br i1 %cmp, label %if.then, label %return, !dbg !19
|
||||
|
||||
; Check that reassociate pass now undefs debug intrinsics that reference a value
|
||||
; that gets dropped and cannot be salvaged.
|
||||
if.then: ; preds = %entry
|
||||
%add1 = fadd fast float %add, %c, !dbg !20
|
||||
call void @llvm.dbg.value(metadata float %add1, metadata !23, metadata !DIExpression()), !dbg !24
|
||||
%sub = fsub fast float %add, 1.200000e+01, !dbg !25
|
||||
%sub2 = fsub fast float %add1, %sub, !dbg !25
|
||||
%mul = fmul fast float %sub2, 2.000000e+01, !dbg !25
|
||||
%div = fdiv fast float %mul, 3.000000e+00, !dbg !25
|
||||
br label %return, !dbg !25
|
||||
|
||||
define hidden i32 @main() local_unnamed_addr {
|
||||
entry:
|
||||
%foo = alloca i32, align 4, !dbg !20
|
||||
%foo.0.foo.0..sroa_cast = bitcast i32* %foo to i8*, !dbg !20
|
||||
call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %foo.0.foo.0..sroa_cast), !dbg !20
|
||||
store volatile i32 4, i32* %foo, align 4, !dbg !20, !tbaa !21
|
||||
%foo.0.foo.0. = load volatile i32, i32* %foo, align 4, !dbg !25, !tbaa !21
|
||||
%foo.0.foo.0.15 = load volatile i32, i32* %foo, align 4, !dbg !27, !tbaa !21
|
||||
%foo.0.foo.0.16 = load volatile i32, i32* %foo, align 4, !dbg !28, !tbaa !21
|
||||
; CHECK-NOT: %add = add nsw i32 %foo.0.foo.0., %foo.0.foo.0.15
|
||||
%add = add nsw i32 %foo.0.foo.0., %foo.0.foo.0.15, !dbg !29
|
||||
; CHECK: call void @llvm.dbg.value(metadata i32 undef, metadata [[VAR_A:![0-9]+]], metadata !DIExpression())
|
||||
call void @llvm.dbg.value(metadata i32 %add, metadata !19, metadata !DIExpression()), !dbg !26
|
||||
%foo.0.foo.0.17 = load volatile i32, i32* %foo, align 4, !dbg !30, !tbaa !21
|
||||
%cmp = icmp eq i32 %foo.0.foo.0.17, 4, !dbg !30
|
||||
br i1 %cmp, label %if.then, label %if.end, !dbg !32
|
||||
|
||||
; CHECK-LABEL: if.then:
|
||||
if.then:
|
||||
; CHECK-NOT: %add1 = add nsw i32 %add, %foo.0.foo.0.16
|
||||
%add1 = add nsw i32 %add, %foo.0.foo.0.16, !dbg !33
|
||||
; CHECK: call void @llvm.dbg.value(metadata i32 undef, metadata [[VAR_A]], metadata !DIExpression())
|
||||
call void @llvm.dbg.value(metadata i32 %add1, metadata !19, metadata !DIExpression()), !dbg !26
|
||||
; CHECK: call void @llvm.dbg.value(metadata i32 undef, metadata [[VAR_CHEESE:![0-9]+]], metadata !DIExpression())
|
||||
call void @llvm.dbg.value(metadata i32 %add, metadata !18, metadata !DIExpression()), !dbg !26
|
||||
%sub = add nsw i32 %add, -12, !dbg !34
|
||||
%sub3 = sub nsw i32 %add1, %sub, !dbg !34
|
||||
%mul = mul nsw i32 %sub3, 20, !dbg !36
|
||||
%div = sdiv i32 %mul, 3, !dbg !37
|
||||
br label %if.end, !dbg !38
|
||||
|
||||
if.end:
|
||||
%a.0 = phi i32 [ %div, %if.then ], [ 0, %entry ], !dbg !39
|
||||
call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %foo.0.foo.0..sroa_cast), !dbg !40
|
||||
ret i32 %a.0, !dbg !41
|
||||
return: ; preds = %entry, %if.then
|
||||
%retval.0 = phi float [ %div, %if.then ], [ 0.000000e+00, %entry ], !dbg !13
|
||||
ret float %retval.0, !dbg !26
|
||||
}
|
||||
|
||||
declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
|
||||
declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
|
||||
declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
|
||||
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
|
||||
declare void @llvm.dbg.value(metadata, metadata, metadata)
|
||||
|
||||
!llvm.dbg.cu = !{!0}
|
||||
!llvm.module.flags = !{!3, !4, !5, !6}
|
||||
!llvm.ident = !{!7}
|
||||
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, debugInfoForProfiling: true, nameTableKind: None)
|
||||
!1 = !DIFile(filename: "test.cpp", directory: "F:\")
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 11.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
|
||||
!1 = !DIFile(filename: "undef_intrinsics_when_deleting_instructions.cpp", directory: "/")
|
||||
!2 = !{}
|
||||
!3 = !{i32 2, !"Dwarf Version", i32 4}
|
||||
!3 = !{i32 2, !"CodeView", i32 1}
|
||||
!4 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!5 = !{i32 1, !"wchar_size", i32 2}
|
||||
!6 = !{i32 7, !"PIC Level", i32 2}
|
||||
!7 = !{!"clang version 10.0.0"}
|
||||
!8 = distinct !DISubprogram(name: "main", scope: !9, file: !9, line: 1, type: !10, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)
|
||||
!9 = !DIFile(filename: "./test.cpp", directory: "F:\")
|
||||
!10 = !DISubroutineType(types: !11)
|
||||
!11 = !{!12}
|
||||
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!13 = !{!14, !16, !17, !18, !19}
|
||||
!14 = !DILocalVariable(name: "foo", scope: !8, file: !9, line: 2, type: !15)
|
||||
!15 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !12)
|
||||
!16 = !DILocalVariable(name: "read1", scope: !8, file: !9, line: 3, type: !12)
|
||||
!17 = !DILocalVariable(name: "read2", scope: !8, file: !9, line: 4, type: !12)
|
||||
; CHECK: [[VAR_CHEESE]] = !DILocalVariable(name: "cheese"
|
||||
!18 = !DILocalVariable(name: "cheese", scope: !8, file: !9, line: 6, type: !12)
|
||||
; CHECK: [[VAR_A]] = !DILocalVariable(name: "a"
|
||||
!19 = !DILocalVariable(name: "a", scope: !8, file: !9, line: 7, type: !12)
|
||||
!20 = !DILocation(line: 2, scope: !8)
|
||||
!21 = !{!22, !22, i64 0}
|
||||
!22 = !{!"int", !23, i64 0}
|
||||
!23 = !{!"omnipotent char", !24, i64 0}
|
||||
!24 = !{!"Simple C++ TBAA"}
|
||||
!25 = !DILocation(line: 3, scope: !8)
|
||||
!26 = !DILocation(line: 0, scope: !8)
|
||||
!27 = !DILocation(line: 4, scope: !8)
|
||||
!28 = !DILocation(line: 6, scope: !8)
|
||||
!29 = !DILocation(line: 7, scope: !8)
|
||||
!30 = !DILocation(line: 10, scope: !31)
|
||||
!31 = distinct !DILexicalBlock(scope: !8, file: !9, line: 10)
|
||||
!32 = !DILocation(line: 10, scope: !8)
|
||||
!33 = !DILocation(line: 8, scope: !8)
|
||||
!34 = !DILocation(line: 12, scope: !35)
|
||||
!35 = distinct !DILexicalBlock(scope: !31, file: !9, line: 10)
|
||||
!36 = !DILocation(line: 13, scope: !35)
|
||||
!37 = !DILocation(line: 14, scope: !35)
|
||||
!38 = !DILocation(line: 15, scope: !35)
|
||||
!39 = !DILocation(line: 0, scope: !31)
|
||||
!40 = !DILocation(line: 20, scope: !8)
|
||||
!41 = !DILocation(line: 19, scope: !8)
|
||||
!7 = !{!"clang version 11.0.0"}
|
||||
!8 = distinct !DISubprogram(name: "foo", linkageName: "?foo@@YAMMMMM@Z", scope: !1, file: !1, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
|
||||
!9 = !DISubroutineType(types: !10)
|
||||
!10 = !{!11, !11, !11, !11, !11}
|
||||
!11 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
|
||||
!12 = !DILocalVariable(name: "d", arg: 4, scope: !8, file: !1, line: 1, type: !11)
|
||||
!13 = !DILocation(line: 0, scope: !8)
|
||||
!14 = !DILocalVariable(name: "c", arg: 3, scope: !8, file: !1, line: 1, type: !11)
|
||||
!15 = !DILocalVariable(name: "b", arg: 2, scope: !8, file: !1, line: 1, type: !11)
|
||||
!16 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 1, type: !11)
|
||||
!17 = !DILocation(line: 2, scope: !8)
|
||||
!18 = !DILocalVariable(name: "x", scope: !8, file: !1, line: 2, type: !11)
|
||||
!19 = !DILocation(line: 3, scope: !8)
|
||||
!20 = !DILocation(line: 4, scope: !21)
|
||||
!21 = distinct !DILexicalBlock(scope: !22, file: !1, line: 3)
|
||||
!22 = distinct !DILexicalBlock(scope: !8, file: !1, line: 3)
|
||||
!23 = !DILocalVariable(name: "y", scope: !21, file: !1, line: 4, type: !11)
|
||||
!24 = !DILocation(line: 0, scope: !21)
|
||||
!25 = !DILocation(line: 5, scope: !21)
|
||||
!26 = !DILocation(line: 8, scope: !8)
|
||||
|
|
|
|||
Loading…
Reference in New Issue