1 files changed, 0 insertions, 344 deletions

diff --git a/contrib/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp b/contrib/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
deleted file mode 100644
index 22f458e4b03e..000000000000
--- a/contrib/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
+++ /dev/null
@@ -1,344 +0,0 @@
-//===-- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp -------*- C++ -*--===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// Common functionality for different debug information format backends.
-// LLVM currently supports DWARF and CodeView.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CodeGen/DebugHandlerBase.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/Twine.h"
-#include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineInstr.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
-#include "llvm/CodeGen/TargetSubtargetInfo.h"
-#include "llvm/IR/DebugInfo.h"
-#include "llvm/MC/MCStreamer.h"
-
-using namespace llvm;
-
-#define DEBUG_TYPE "dwarfdebug"
-
-Optional<DbgVariableLocation>
-DbgVariableLocation::extractFromMachineInstruction(
-    const MachineInstr &Instruction) {
-  DbgVariableLocation Location;
-  if (!Instruction.isDebugValue())
-    return None;
-  if (!Instruction.getOperand(0).isReg())
-    return None;
-  Location.Register = Instruction.getOperand(0).getReg();
-  Location.FragmentInfo.reset();
-  // We only handle expressions generated by DIExpression::appendOffset,
-  // which doesn't require a full stack machine.
-  int64_t Offset = 0;
-  const DIExpression *DIExpr = Instruction.getDebugExpression();
-  auto Op = DIExpr->expr_op_begin();
-  while (Op != DIExpr->expr_op_end()) {
-    switch (Op->getOp()) {
-    case dwarf::DW_OP_constu: {
-      int Value = Op->getArg(0);
-      ++Op;
-      if (Op != DIExpr->expr_op_end()) {
-        switch (Op->getOp()) {
-        case dwarf::DW_OP_minus:
-          Offset -= Value;
-          break;
-        case dwarf::DW_OP_plus:
-          Offset += Value;
-          break;
-        default:
-          continue;
-        }
-      }
-    } break;
-    case dwarf::DW_OP_plus_uconst:
-      Offset += Op->getArg(0);
-      break;
-    case dwarf::DW_OP_LLVM_fragment:
-      Location.FragmentInfo = {Op->getArg(1), Op->getArg(0)};
-      break;
-    case dwarf::DW_OP_deref:
-      Location.LoadChain.push_back(Offset);
-      Offset = 0;
-      break;
-    default:
-      return None;
-    }
-    ++Op;
-  }
-
-  // Do one final implicit DW_OP_deref if this was an indirect DBG_VALUE
-  // instruction.
-  // FIXME: Replace these with DIExpression.
-  if (Instruction.isIndirectDebugValue())
-    Location.LoadChain.push_back(Offset);
-
-  return Location;
-}
-
-DebugHandlerBase::DebugHandlerBase(AsmPrinter *A) : Asm(A), MMI(Asm->MMI) {}
-
-// Each LexicalScope has first instruction and last instruction to mark
-// beginning and end of a scope respectively. Create an inverse map that list
-// scopes starts (and ends) with an instruction. One instruction may start (or
-// end) multiple scopes. Ignore scopes that are not reachable.
-void DebugHandlerBase::identifyScopeMarkers() {
-  SmallVector<LexicalScope *, 4> WorkList;
-  WorkList.push_back(LScopes.getCurrentFunctionScope());
-  while (!WorkList.empty()) {
-    LexicalScope *S = WorkList.pop_back_val();
-
-    const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
-    if (!Children.empty())
-      WorkList.append(Children.begin(), Children.end());
-
-    if (S->isAbstractScope())
-      continue;
-
-    for (const InsnRange &R : S->getRanges()) {
-      assert(R.first && "InsnRange does not have first instruction!");
-      assert(R.second && "InsnRange does not have second instruction!");
-      requestLabelBeforeInsn(R.first);
-      requestLabelAfterInsn(R.second);
-    }
-  }
-}
-
-// Return Label preceding the instruction.
-MCSymbol *DebugHandlerBase::getLabelBeforeInsn(const MachineInstr *MI) {
-  MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
-  assert(Label && "Didn't insert label before instruction");
-  return Label;
-}
-
-// Return Label immediately following the instruction.
-MCSymbol *DebugHandlerBase::getLabelAfterInsn(const MachineInstr *MI) {
-  return LabelsAfterInsn.lookup(MI);
-}
-
-// Return the function-local offset of an instruction.
-const MCExpr *
-DebugHandlerBase::getFunctionLocalOffsetAfterInsn(const MachineInstr *MI) {
-  MCContext &MC = Asm->OutContext;
-
-  MCSymbol *Start = Asm->getFunctionBegin();
-  const auto *StartRef = MCSymbolRefExpr::create(Start, MC);
-
-  MCSymbol *AfterInsn = getLabelAfterInsn(MI);
-  assert(AfterInsn && "Expected label after instruction");
-  const auto *AfterRef = MCSymbolRefExpr::create(AfterInsn, MC);
-
-  return MCBinaryExpr::createSub(AfterRef, StartRef, MC);
-}
-
-/// If this type is derived from a base type then return base type size.
-uint64_t DebugHandlerBase::getBaseTypeSize(const DIType *Ty) {
-  assert(Ty);
-  const DIDerivedType *DDTy = dyn_cast<DIDerivedType>(Ty);
-  if (!DDTy)
-    return Ty->getSizeInBits();
-
-  unsigned Tag = DDTy->getTag();
-
-  if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
-      Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
-      Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_atomic_type)
-    return DDTy->getSizeInBits();
-
-  DIType *BaseType = DDTy->getBaseType();
-
-  if (!BaseType)
-    return 0;
-
-  // If this is a derived type, go ahead and get the base type, unless it's a
-  // reference then it's just the size of the field. Pointer types have no need
-  // of this since they're a different type of qualification on the type.
-  if (BaseType->getTag() == dwarf::DW_TAG_reference_type ||
-      BaseType->getTag() == dwarf::DW_TAG_rvalue_reference_type)
-    return Ty->getSizeInBits();
-
-  return getBaseTypeSize(BaseType);
-}
-
-static bool hasDebugInfo(const MachineModuleInfo *MMI,
-                         const MachineFunction *MF) {
-  if (!MMI->hasDebugInfo())
-    return false;
-  auto *SP = MF->getFunction().getSubprogram();
-  if (!SP)
-    return false;
-  assert(SP->getUnit());
-  auto EK = SP->getUnit()->getEmissionKind();
-  if (EK == DICompileUnit::NoDebug)
-    return false;
-  return true;
-}
-
-void DebugHandlerBase::beginFunction(const MachineFunction *MF) {
-  PrevInstBB = nullptr;
-
-  if (!Asm || !hasDebugInfo(MMI, MF)) {
-    skippedNonDebugFunction();
-    return;
-  }
-
-  // Grab the lexical scopes for the function, if we don't have any of those
-  // then we're not going to be able to do anything.
-  LScopes.initialize(*MF);
-  if (LScopes.empty()) {
-    beginFunctionImpl(MF);
-    return;
-  }
-
-  // Make sure that each lexical scope will have a begin/end label.
-  identifyScopeMarkers();
-
-  // Calculate history for local variables.
-  assert(DbgValues.empty() && "DbgValues map wasn't cleaned!");
-  assert(DbgLabels.empty() && "DbgLabels map wasn't cleaned!");
-  calculateDbgEntityHistory(MF, Asm->MF->getSubtarget().getRegisterInfo(),
-                            DbgValues, DbgLabels);
-  LLVM_DEBUG(DbgValues.dump());
-
-  // Request labels for the full history.
-  for (const auto &I : DbgValues) {
-    const auto &Entries = I.second;
-    if (Entries.empty())
-      continue;
-
-    auto IsDescribedByReg = [](const MachineInstr *MI) {
-      return MI->getOperand(0).isReg() && MI->getOperand(0).getReg();
-    };
-
-    // The first mention of a function argument gets the CurrentFnBegin label,
-    // so arguments are visible when breaking at function entry.
-    //
-    // We do not change the label for values that are described by registers,
-    // as that could place them above their defining instructions. We should
-    // ideally not change the labels for constant debug values either, since
-    // doing that violates the ranges that are calculated in the history map.
-    // However, we currently do not emit debug values for constant arguments
-    // directly at the start of the function, so this code is still useful.
-    const DILocalVariable *DIVar =
-        Entries.front().getInstr()->getDebugVariable();
-    if (DIVar->isParameter() &&
-        getDISubprogram(DIVar->getScope())->describes(&MF->getFunction())) {
-      if (!IsDescribedByReg(Entries.front().getInstr()))
-        LabelsBeforeInsn[Entries.front().getInstr()] = Asm->getFunctionBegin();
-      if (Entries.front().getInstr()->getDebugExpression()->isFragment()) {
-        // Mark all non-overlapping initial fragments.
-        for (auto I = Entries.begin(); I != Entries.end(); ++I) {
-          if (!I->isDbgValue())
-            continue;
-          const DIExpression *Fragment = I->getInstr()->getDebugExpression();
-          if (std::any_of(Entries.begin(), I,
-                          [&](DbgValueHistoryMap::Entry Pred) {
-                            return Pred.isDbgValue() &&
-                                   Fragment->fragmentsOverlap(
-                                       Pred.getInstr()->getDebugExpression());
-                          }))
-            break;
-          // The code that generates location lists for DWARF assumes that the
-          // entries' start labels are monotonically increasing, and since we
-          // don't change the label for fragments that are described by
-          // registers, we must bail out when encountering such a fragment.
-          if (IsDescribedByReg(I->getInstr()))
-            break;
-          LabelsBeforeInsn[I->getInstr()] = Asm->getFunctionBegin();
-        }
-      }
-    }
-
-    for (const auto &Entry : Entries) {
-      if (Entry.isDbgValue())
-        requestLabelBeforeInsn(Entry.getInstr());
-      else
-        requestLabelAfterInsn(Entry.getInstr());
-    }
-  }
-
-  // Ensure there is a symbol before DBG_LABEL.
-  for (const auto &I : DbgLabels) {
-    const MachineInstr *MI = I.second;
-    requestLabelBeforeInsn(MI);
-  }
-
-  PrevInstLoc = DebugLoc();
-  PrevLabel = Asm->getFunctionBegin();
-  beginFunctionImpl(MF);
-}
-
-void DebugHandlerBase::beginInstruction(const MachineInstr *MI) {
-  if (!MMI->hasDebugInfo())
-    return;
-
-  assert(CurMI == nullptr);
-  CurMI = MI;
-
-  // Insert labels where requested.
-  DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
-      LabelsBeforeInsn.find(MI);
-
-  // No label needed.
-  if (I == LabelsBeforeInsn.end())
-    return;
-
-  // Label already assigned.
-  if (I->second)
-    return;
-
-  if (!PrevLabel) {
-    PrevLabel = MMI->getContext().createTempSymbol();
-    Asm->OutStreamer->EmitLabel(PrevLabel);
-  }
-  I->second = PrevLabel;
-}
-
-void DebugHandlerBase::endInstruction() {
-  if (!MMI->hasDebugInfo())
-    return;
-
-  assert(CurMI != nullptr);
-  // Don't create a new label after DBG_VALUE and other instructions that don't
-  // generate code.
-  if (!CurMI->isMetaInstruction()) {
-    PrevLabel = nullptr;
-    PrevInstBB = CurMI->getParent();
-  }
-
-  DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
-      LabelsAfterInsn.find(CurMI);
-  CurMI = nullptr;
-
-  // No label needed.
-  if (I == LabelsAfterInsn.end())
-    return;
-
-  // Label already assigned.
-  if (I->second)
-    return;
-
-  // We need a label after this instruction.
-  if (!PrevLabel) {
-    PrevLabel = MMI->getContext().createTempSymbol();
-    Asm->OutStreamer->EmitLabel(PrevLabel);
-  }
-  I->second = PrevLabel;
-}
-
-void DebugHandlerBase::endFunction(const MachineFunction *MF) {
-  if (hasDebugInfo(MMI, MF))
-    endFunctionImpl(MF);
-  DbgValues.clear();
-  DbgLabels.clear();
-  LabelsBeforeInsn.clear();
-  LabelsAfterInsn.clear();
-}