d499df02a2
This implements the DbgAssignIntrinsic class as a variant of DPValues - unfortunately this involves increasing the size of the `DebugValueUser` storage by 3x, but this is necessary to enable assigns to be represented, and can be offset in a future patch by splitting DPValue into subclasses such that each variant can store only the fields it needs. This patch does not actually create DPVAssigns in any case; future patches will handle this variant in all cases where generic DPValue handling does not. This patch also does not implement tracking support for DIAssignIDs, which is necessary to find DPVAssigns that reference a given DIAssignID; that is added in a subsequent patch.
547 lines
20 KiB
C++
547 lines
20 KiB
C++
//======-- DebugProgramInstruction.cpp - Implement DPValues/DPMarkers --======//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/IR/DebugProgramInstruction.h"
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#include "llvm/IR/DIBuilder.h"
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#include "llvm/IR/IntrinsicInst.h"
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namespace llvm {
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DPValue::DPValue(const DbgVariableIntrinsic *DVI)
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: DebugValueUser({DVI->getRawLocation(), nullptr, nullptr}),
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Variable(DVI->getVariable()), Expression(DVI->getExpression()),
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DbgLoc(DVI->getDebugLoc()), AddressExpression(nullptr) {
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switch (DVI->getIntrinsicID()) {
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case Intrinsic::dbg_value:
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Type = LocationType::Value;
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break;
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case Intrinsic::dbg_declare:
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Type = LocationType::Declare;
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break;
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case Intrinsic::dbg_assign: {
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Type = LocationType::Assign;
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const DbgAssignIntrinsic *Assign =
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static_cast<const DbgAssignIntrinsic *>(DVI);
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resetDebugValue(1, Assign->getRawAddress());
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AddressExpression = Assign->getAddressExpression();
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setAssignId(Assign->getAssignID());
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break;
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}
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default:
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llvm_unreachable(
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"Trying to create a DPValue with an invalid intrinsic type!");
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}
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}
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DPValue::DPValue(const DPValue &DPV)
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: DebugValueUser(DPV.DebugValues), Variable(DPV.getVariable()),
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Expression(DPV.getExpression()), DbgLoc(DPV.getDebugLoc()),
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AddressExpression(DPV.AddressExpression), Type(DPV.getType()) {}
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DPValue::DPValue(Metadata *Location, DILocalVariable *DV, DIExpression *Expr,
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const DILocation *DI, LocationType Type)
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: DebugValueUser({Location, nullptr, nullptr}), Variable(DV),
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Expression(Expr), DbgLoc(DI), Type(Type) {}
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DPValue::DPValue(Metadata *Value, DILocalVariable *Variable,
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DIExpression *Expression, DIAssignID *AssignID,
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Metadata *Address, DIExpression *AddressExpression,
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const DILocation *DI)
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: DebugValueUser({Value, Address, AssignID}), Variable(Variable),
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Expression(Expression), DbgLoc(DI), AddressExpression(AddressExpression),
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Type(LocationType::Assign) {}
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void DPValue::deleteInstr() { delete this; }
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DPValue *DPValue::createDPValue(Value *Location, DILocalVariable *DV,
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DIExpression *Expr, const DILocation *DI) {
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return new DPValue(ValueAsMetadata::get(Location), DV, Expr, DI,
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LocationType::Value);
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}
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DPValue *DPValue::createDPValue(Value *Location, DILocalVariable *DV,
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DIExpression *Expr, const DILocation *DI,
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DPValue &InsertBefore) {
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auto *NewDPValue = createDPValue(Location, DV, Expr, DI);
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NewDPValue->insertBefore(&InsertBefore);
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return NewDPValue;
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}
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DPValue *DPValue::createDPVDeclare(Value *Address, DILocalVariable *DV,
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DIExpression *Expr, const DILocation *DI) {
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return new DPValue(ValueAsMetadata::get(Address), DV, Expr, DI,
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LocationType::Declare);
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}
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DPValue *DPValue::createDPVDeclare(Value *Address, DILocalVariable *DV,
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DIExpression *Expr, const DILocation *DI,
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DPValue &InsertBefore) {
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auto *NewDPVDeclare = createDPVDeclare(Address, DV, Expr, DI);
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NewDPVDeclare->insertBefore(&InsertBefore);
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return NewDPVDeclare;
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}
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DPValue *DPValue::createDPVAssign(Value *Val, DILocalVariable *Variable,
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DIExpression *Expression,
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DIAssignID *AssignID, Value *Address,
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DIExpression *AddressExpression,
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const DILocation *DI) {
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return new DPValue(ValueAsMetadata::get(Val), Variable, Expression, AssignID,
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ValueAsMetadata::get(Address), AddressExpression, DI);
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}
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DPValue *DPValue::createLinkedDPVAssign(Instruction *LinkedInstr, Value *Val,
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DILocalVariable *Variable,
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DIExpression *Expression,
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Value *Address,
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DIExpression *AddressExpression,
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const DILocation *DI) {
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auto *Link = LinkedInstr->getMetadata(LLVMContext::MD_DIAssignID);
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assert(Link && "Linked instruction must have DIAssign metadata attached");
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auto *NewDPVAssign = DPValue::createDPVAssign(Val, Variable, Expression,
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cast<DIAssignID>(Link), Address,
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AddressExpression, DI);
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LinkedInstr->getParent()->insertDPValueAfter(NewDPVAssign, LinkedInstr);
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return NewDPVAssign;
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}
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iterator_range<DPValue::location_op_iterator> DPValue::location_ops() const {
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auto *MD = getRawLocation();
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// If a Value has been deleted, the "location" for this DPValue will be
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// replaced by nullptr. Return an empty range.
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if (!MD)
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return {location_op_iterator(static_cast<ValueAsMetadata *>(nullptr)),
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location_op_iterator(static_cast<ValueAsMetadata *>(nullptr))};
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// If operand is ValueAsMetadata, return a range over just that operand.
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if (auto *VAM = dyn_cast<ValueAsMetadata>(MD))
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return {location_op_iterator(VAM), location_op_iterator(VAM + 1)};
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// If operand is DIArgList, return a range over its args.
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if (auto *AL = dyn_cast<DIArgList>(MD))
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return {location_op_iterator(AL->args_begin()),
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location_op_iterator(AL->args_end())};
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// Operand is an empty metadata tuple, so return empty iterator.
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assert(cast<MDNode>(MD)->getNumOperands() == 0);
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return {location_op_iterator(static_cast<ValueAsMetadata *>(nullptr)),
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location_op_iterator(static_cast<ValueAsMetadata *>(nullptr))};
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}
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unsigned DPValue::getNumVariableLocationOps() const {
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if (hasArgList())
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return cast<DIArgList>(getRawLocation())->getArgs().size();
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return 1;
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}
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Value *DPValue::getVariableLocationOp(unsigned OpIdx) const {
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auto *MD = getRawLocation();
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if (!MD)
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return nullptr;
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if (auto *AL = dyn_cast<DIArgList>(MD))
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return AL->getArgs()[OpIdx]->getValue();
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if (isa<MDNode>(MD))
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return nullptr;
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assert(isa<ValueAsMetadata>(MD) &&
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"Attempted to get location operand from DPValue with none.");
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auto *V = cast<ValueAsMetadata>(MD);
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assert(OpIdx == 0 && "Operand Index must be 0 for a debug intrinsic with a "
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"single location operand.");
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return V->getValue();
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}
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static ValueAsMetadata *getAsMetadata(Value *V) {
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return isa<MetadataAsValue>(V) ? dyn_cast<ValueAsMetadata>(
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cast<MetadataAsValue>(V)->getMetadata())
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: ValueAsMetadata::get(V);
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}
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void DPValue::replaceVariableLocationOp(Value *OldValue, Value *NewValue,
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bool AllowEmpty) {
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assert(NewValue && "Values must be non-null");
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bool DbgAssignAddrReplaced = isDbgAssign() && OldValue == getAddress();
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if (DbgAssignAddrReplaced)
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setAddress(NewValue);
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auto Locations = location_ops();
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auto OldIt = find(Locations, OldValue);
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if (OldIt == Locations.end()) {
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if (AllowEmpty || DbgAssignAddrReplaced)
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return;
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llvm_unreachable("OldValue must be a current location");
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}
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if (!hasArgList()) {
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// Set our location to be the MAV wrapping the new Value.
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setRawLocation(isa<MetadataAsValue>(NewValue)
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? cast<MetadataAsValue>(NewValue)->getMetadata()
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: ValueAsMetadata::get(NewValue));
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return;
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}
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// We must be referring to a DIArgList, produce a new operands vector with the
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// old value replaced, generate a new DIArgList and set it as our location.
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SmallVector<ValueAsMetadata *, 4> MDs;
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ValueAsMetadata *NewOperand = getAsMetadata(NewValue);
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for (auto *VMD : Locations)
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MDs.push_back(VMD == *OldIt ? NewOperand : getAsMetadata(VMD));
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setRawLocation(DIArgList::get(getVariableLocationOp(0)->getContext(), MDs));
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}
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void DPValue::replaceVariableLocationOp(unsigned OpIdx, Value *NewValue) {
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assert(OpIdx < getNumVariableLocationOps() && "Invalid Operand Index");
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if (!hasArgList()) {
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setRawLocation(isa<MetadataAsValue>(NewValue)
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? cast<MetadataAsValue>(NewValue)->getMetadata()
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: ValueAsMetadata::get(NewValue));
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return;
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}
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SmallVector<ValueAsMetadata *, 4> MDs;
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ValueAsMetadata *NewOperand = getAsMetadata(NewValue);
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for (unsigned Idx = 0; Idx < getNumVariableLocationOps(); ++Idx)
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MDs.push_back(Idx == OpIdx ? NewOperand
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: getAsMetadata(getVariableLocationOp(Idx)));
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setRawLocation(DIArgList::get(getVariableLocationOp(0)->getContext(), MDs));
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}
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void DPValue::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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setExpression(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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setRawLocation(DIArgList::get(getVariableLocationOp(0)->getContext(), MDs));
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}
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void DPValue::setKillLocation() {
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// TODO: When/if we remove duplicate values from DIArgLists, we don't need
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// this set anymore.
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SmallPtrSet<Value *, 4> RemovedValues;
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for (Value *OldValue : location_ops()) {
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if (!RemovedValues.insert(OldValue).second)
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continue;
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Value *Poison = PoisonValue::get(OldValue->getType());
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replaceVariableLocationOp(OldValue, Poison);
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}
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}
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bool DPValue::isKillLocation() const {
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return (getNumVariableLocationOps() == 0 &&
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!getExpression()->isComplex()) ||
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any_of(location_ops(), [](Value *V) { return isa<UndefValue>(V); });
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}
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std::optional<uint64_t> DPValue::getFragmentSizeInBits() const {
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if (auto Fragment = getExpression()->getFragmentInfo())
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return Fragment->SizeInBits;
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return getVariable()->getSizeInBits();
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}
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DPValue *DPValue::clone() const { return new DPValue(*this); }
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DbgVariableIntrinsic *
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DPValue::createDebugIntrinsic(Module *M, Instruction *InsertBefore) const {
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[[maybe_unused]] DICompileUnit *Unit =
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getDebugLoc().get()->getScope()->getSubprogram()->getUnit();
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assert(M && Unit &&
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"Cannot clone from BasicBlock that is not part of a Module or "
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"DICompileUnit!");
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LLVMContext &Context = getDebugLoc()->getContext();
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Function *IntrinsicFn;
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// Work out what sort of intrinsic we're going to produce.
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switch (getType()) {
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case DPValue::LocationType::Declare:
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IntrinsicFn = Intrinsic::getDeclaration(M, Intrinsic::dbg_declare);
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break;
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case DPValue::LocationType::Value:
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IntrinsicFn = Intrinsic::getDeclaration(M, Intrinsic::dbg_value);
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break;
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case DPValue::LocationType::Assign:
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IntrinsicFn = Intrinsic::getDeclaration(M, Intrinsic::dbg_assign);
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break;
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case DPValue::LocationType::End:
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case DPValue::LocationType::Any:
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llvm_unreachable("Invalid LocationType");
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}
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// Create the intrinsic from this DPValue's information, optionally insert
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// into the target location.
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DbgVariableIntrinsic *DVI;
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if (isDbgAssign()) {
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Value *AssignArgs[] = {
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MetadataAsValue::get(Context, getRawLocation()),
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MetadataAsValue::get(Context, getVariable()),
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MetadataAsValue::get(Context, getExpression()),
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MetadataAsValue::get(Context, getAssignID()),
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MetadataAsValue::get(Context, getRawAddress()),
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MetadataAsValue::get(Context, getAddressExpression())};
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DVI = cast<DbgVariableIntrinsic>(CallInst::Create(
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IntrinsicFn->getFunctionType(), IntrinsicFn, AssignArgs));
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} else {
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Value *Args[] = {MetadataAsValue::get(Context, getRawLocation()),
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MetadataAsValue::get(Context, getVariable()),
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MetadataAsValue::get(Context, getExpression())};
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DVI = cast<DbgVariableIntrinsic>(
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CallInst::Create(IntrinsicFn->getFunctionType(), IntrinsicFn, Args));
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}
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DVI->setTailCall();
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DVI->setDebugLoc(getDebugLoc());
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if (InsertBefore)
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DVI->insertBefore(InsertBefore);
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return DVI;
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}
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Value *DPValue::getAddress() const {
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auto *MD = getRawAddress();
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if (auto *V = dyn_cast<ValueAsMetadata>(MD))
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return V->getValue();
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// When the value goes to null, it gets replaced by an empty MDNode.
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assert(!cast<MDNode>(MD)->getNumOperands() && "Expected an empty MDNode");
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return nullptr;
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}
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DIAssignID *DPValue::getAssignID() const {
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return cast<DIAssignID>(DebugValues[2]);
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}
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void DPValue::setAssignId(DIAssignID *New) { resetDebugValue(2, New); }
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void DPValue::setKillAddress() {
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resetDebugValue(
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1, ValueAsMetadata::get(UndefValue::get(getAddress()->getType())));
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}
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bool DPValue::isKillAddress() const {
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Value *Addr = getAddress();
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return !Addr || isa<UndefValue>(Addr);
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}
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const BasicBlock *DPValue::getParent() const {
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return Marker->MarkedInstr->getParent();
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}
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BasicBlock *DPValue::getParent() { return Marker->MarkedInstr->getParent(); }
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BasicBlock *DPValue::getBlock() { return Marker->getParent(); }
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const BasicBlock *DPValue::getBlock() const { return Marker->getParent(); }
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Function *DPValue::getFunction() { return getBlock()->getParent(); }
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const Function *DPValue::getFunction() const { return getBlock()->getParent(); }
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Module *DPValue::getModule() { return getFunction()->getParent(); }
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const Module *DPValue::getModule() const { return getFunction()->getParent(); }
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LLVMContext &DPValue::getContext() { return getBlock()->getContext(); }
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const LLVMContext &DPValue::getContext() const {
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return getBlock()->getContext();
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}
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void DPValue::insertBefore(DPValue *InsertBefore) {
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assert(!getMarker() &&
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"Cannot insert a DPValue that is already has a DPMarker!");
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assert(InsertBefore->getMarker() &&
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"Cannot insert a DPValue before a DPValue that does not have a "
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"DPMarker!");
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InsertBefore->getMarker()->insertDPValue(this, InsertBefore);
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}
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void DPValue::insertAfter(DPValue *InsertAfter) {
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assert(!getMarker() &&
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"Cannot insert a DPValue that is already has a DPMarker!");
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assert(InsertAfter->getMarker() &&
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"Cannot insert a DPValue after a DPValue that does not have a "
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"DPMarker!");
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InsertAfter->getMarker()->insertDPValueAfter(this, InsertAfter);
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}
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void DPValue::moveBefore(DPValue *MoveBefore) {
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assert(getMarker() &&
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"Canot move a DPValue that does not currently have a DPMarker!");
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removeFromParent();
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insertBefore(MoveBefore);
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}
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void DPValue::moveAfter(DPValue *MoveAfter) {
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assert(getMarker() &&
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"Canot move a DPValue that does not currently have a DPMarker!");
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removeFromParent();
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insertAfter(MoveAfter);
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}
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///////////////////////////////////////////////////////////////////////////////
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// An empty, global, DPMarker for the purpose of describing empty ranges of
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// DPValues.
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DPMarker DPMarker::EmptyDPMarker;
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void DPMarker::dropDPValues() {
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while (!StoredDPValues.empty()) {
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auto It = StoredDPValues.begin();
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DPValue *DPV = &*It;
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StoredDPValues.erase(It);
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DPV->deleteInstr();
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}
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}
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void DPMarker::dropOneDPValue(DPValue *DPV) {
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assert(DPV->getMarker() == this);
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StoredDPValues.erase(DPV->getIterator());
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DPV->deleteInstr();
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}
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const BasicBlock *DPMarker::getParent() const {
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return MarkedInstr->getParent();
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}
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BasicBlock *DPMarker::getParent() { return MarkedInstr->getParent(); }
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void DPMarker::removeMarker() {
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// Are there any DPValues in this DPMarker? If not, nothing to preserve.
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Instruction *Owner = MarkedInstr;
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if (StoredDPValues.empty()) {
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eraseFromParent();
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Owner->DbgMarker = nullptr;
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return;
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}
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// The attached DPValues need to be preserved; attach them to the next
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// instruction. If there isn't a next instruction, put them on the
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// "trailing" list.
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DPMarker *NextMarker = Owner->getParent()->getNextMarker(Owner);
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if (NextMarker == nullptr) {
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NextMarker = new DPMarker();
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Owner->getParent()->setTrailingDPValues(NextMarker);
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}
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NextMarker->absorbDebugValues(*this, true);
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eraseFromParent();
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}
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void DPMarker::removeFromParent() {
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MarkedInstr->DbgMarker = nullptr;
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MarkedInstr = nullptr;
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}
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void DPMarker::eraseFromParent() {
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if (MarkedInstr)
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removeFromParent();
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dropDPValues();
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delete this;
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}
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iterator_range<DPValue::self_iterator> DPMarker::getDbgValueRange() {
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return make_range(StoredDPValues.begin(), StoredDPValues.end());
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}
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iterator_range<DPValue::const_self_iterator>
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DPMarker::getDbgValueRange() const {
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return make_range(StoredDPValues.begin(), StoredDPValues.end());
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}
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void DPValue::removeFromParent() {
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getMarker()->StoredDPValues.erase(getIterator());
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Marker = nullptr;
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}
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void DPValue::eraseFromParent() {
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removeFromParent();
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deleteInstr();
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}
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void DPMarker::insertDPValue(DPValue *New, bool InsertAtHead) {
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auto It = InsertAtHead ? StoredDPValues.begin() : StoredDPValues.end();
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StoredDPValues.insert(It, *New);
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New->setMarker(this);
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}
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void DPMarker::insertDPValue(DPValue *New, DPValue *InsertBefore) {
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assert(InsertBefore->getMarker() == this &&
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|
"DPValue 'InsertBefore' must be contained in this DPMarker!");
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StoredDPValues.insert(InsertBefore->getIterator(), *New);
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New->setMarker(this);
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}
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void DPMarker::insertDPValueAfter(DPValue *New, DPValue *InsertAfter) {
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|
assert(InsertAfter->getMarker() == this &&
|
|
"DPValue 'InsertAfter' must be contained in this DPMarker!");
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|
StoredDPValues.insert(++(InsertAfter->getIterator()), *New);
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New->setMarker(this);
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}
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|
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void DPMarker::absorbDebugValues(DPMarker &Src, bool InsertAtHead) {
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auto It = InsertAtHead ? StoredDPValues.begin() : StoredDPValues.end();
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for (DPValue &DPV : Src.StoredDPValues)
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|
DPV.setMarker(this);
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|
|
|
StoredDPValues.splice(It, Src.StoredDPValues);
|
|
}
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|
|
|
void DPMarker::absorbDebugValues(iterator_range<DPValue::self_iterator> Range,
|
|
DPMarker &Src, bool InsertAtHead) {
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|
for (DPValue &DPV : Range)
|
|
DPV.setMarker(this);
|
|
|
|
auto InsertPos =
|
|
(InsertAtHead) ? StoredDPValues.begin() : StoredDPValues.end();
|
|
|
|
StoredDPValues.splice(InsertPos, Src.StoredDPValues, Range.begin(),
|
|
Range.end());
|
|
}
|
|
|
|
iterator_range<simple_ilist<DPValue>::iterator> DPMarker::cloneDebugInfoFrom(
|
|
DPMarker *From, std::optional<simple_ilist<DPValue>::iterator> from_here,
|
|
bool InsertAtHead) {
|
|
DPValue *First = nullptr;
|
|
// Work out what range of DPValues to clone: normally all the contents of the
|
|
// "From" marker, optionally we can start from the from_here position down to
|
|
// end().
|
|
auto Range =
|
|
make_range(From->StoredDPValues.begin(), From->StoredDPValues.end());
|
|
if (from_here.has_value())
|
|
Range = make_range(*from_here, From->StoredDPValues.end());
|
|
|
|
// Clone each DPValue and insert into StoreDPValues; optionally place them at
|
|
// the start or the end of the list.
|
|
auto Pos = (InsertAtHead) ? StoredDPValues.begin() : StoredDPValues.end();
|
|
for (DPValue &DPV : Range) {
|
|
DPValue *New = DPV.clone();
|
|
New->setMarker(this);
|
|
StoredDPValues.insert(Pos, *New);
|
|
if (!First)
|
|
First = New;
|
|
}
|
|
|
|
if (!First)
|
|
return {StoredDPValues.end(), StoredDPValues.end()};
|
|
|
|
if (InsertAtHead)
|
|
// If InsertAtHead is set, we cloned a range onto the front of of the
|
|
// StoredDPValues collection, return that range.
|
|
return {StoredDPValues.begin(), Pos};
|
|
else
|
|
// We inserted a block at the end, return that range.
|
|
return {First->getIterator(), StoredDPValues.end()};
|
|
}
|
|
|
|
} // end namespace llvm
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