Imported Upstream version 5.18.0.207

Former-commit-id: 3b152f462918d427ce18620a2cbe4f8b79650449

external/llvm/lib/DebugInfo/DWARF/DWARFAbbreviationDeclaration.cpp

@@ -1,232 +0,0 @@
-//===- DWARFAbbreviationDeclaration.cpp -----------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/DebugInfo/DWARF/DWARFAbbreviationDeclaration.h"
-
-#include "llvm/ADT/None.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/BinaryFormat/Dwarf.h"
-#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
-#include "llvm/DebugInfo/DWARF/DWARFUnit.h"
-#include "llvm/Support/DataExtractor.h"
-#include "llvm/Support/Format.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cstddef>
-#include <cstdint>
-
-using namespace llvm;
-using namespace dwarf;
-
-void DWARFAbbreviationDeclaration::clear() {
-  Code = 0;
-  Tag = DW_TAG_null;
-  CodeByteSize = 0;
-  HasChildren = false;
-  AttributeSpecs.clear();
-  FixedAttributeSize.reset();
-}
-
-DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration() {
-  clear();
-}
-
-bool
-DWARFAbbreviationDeclaration::extract(DataExtractor Data, 
-                                      uint32_t* OffsetPtr) {
-  clear();
-  const uint32_t Offset = *OffsetPtr;
-  Code = Data.getULEB128(OffsetPtr);
-  if (Code == 0) {
-    return false;
-  }
-  CodeByteSize = *OffsetPtr - Offset;
-  Tag = static_cast<llvm::dwarf::Tag>(Data.getULEB128(OffsetPtr));
-  if (Tag == DW_TAG_null) {
-    clear();
-    return false;
-  }
-  uint8_t ChildrenByte = Data.getU8(OffsetPtr);
-  HasChildren = (ChildrenByte == DW_CHILDREN_yes);
-  // Assign a value to our optional FixedAttributeSize member variable. If
-  // this member variable still has a value after the while loop below, then
-  // all attribute data in this abbreviation declaration has a fixed byte size.
-  FixedAttributeSize = FixedSizeInfo();
-
-  // Read all of the abbreviation attributes and forms.
-  while (true) {
-    auto A = static_cast<Attribute>(Data.getULEB128(OffsetPtr));
-    auto F = static_cast<Form>(Data.getULEB128(OffsetPtr));
-    if (A && F) {
-      bool IsImplicitConst = (F == DW_FORM_implicit_const);
-      if (IsImplicitConst) {
-        int64_t V = Data.getSLEB128(OffsetPtr);
-        AttributeSpecs.push_back(AttributeSpec(A, F, V));
-        continue;
-      }
-      Optional<uint8_t> ByteSize;
-      // If this abbrevation still has a fixed byte size, then update the
-      // FixedAttributeSize as needed.
-      switch (F) {
-      case DW_FORM_addr:
-        if (FixedAttributeSize)
-          ++FixedAttributeSize->NumAddrs;
-        break;
-
-      case DW_FORM_ref_addr:
-        if (FixedAttributeSize)
-          ++FixedAttributeSize->NumRefAddrs;
-        break;
-
-      case DW_FORM_strp:
-      case DW_FORM_GNU_ref_alt:
-      case DW_FORM_GNU_strp_alt:
-      case DW_FORM_line_strp:
-      case DW_FORM_sec_offset:
-      case DW_FORM_strp_sup:
-        if (FixedAttributeSize)
-          ++FixedAttributeSize->NumDwarfOffsets;
-        break;
-
-      default:
-        // The form has a byte size that doesn't depend on Params.
-        // If it's a fixed size, keep track of it.
-        if ((ByteSize =
-                 DWARFFormValue::getFixedByteSize(F, DWARFFormParams()))) {
-          if (FixedAttributeSize)
-            FixedAttributeSize->NumBytes += *ByteSize;
-          break;
-        }
-        // Indicate we no longer have a fixed byte size for this
-        // abbreviation by clearing the FixedAttributeSize optional value
-        // so it doesn't have a value.
-        FixedAttributeSize.reset();
-        break;
-      }
-      // Record this attribute and its fixed size if it has one.
-      AttributeSpecs.push_back(AttributeSpec(A, F, ByteSize));
-    } else if (A == 0 && F == 0) {
-      // We successfully reached the end of this abbreviation declaration
-      // since both attribute and form are zero.
-      break;
-    } else {
-      // Attribute and form pairs must either both be non-zero, in which case
-      // they are added to the abbreviation declaration, or both be zero to
-      // terminate the abbrevation declaration. In this case only one was
-      // zero which is an error.
-      clear();
-      return false;
-    }
-  }
-  return true;
-}
-
-void DWARFAbbreviationDeclaration::dump(raw_ostream &OS) const {
-  auto tagString = TagString(getTag());
-  OS << '[' << getCode() << "] ";
-  if (!tagString.empty())
-    OS << tagString;
-  else
-    OS << format("DW_TAG_Unknown_%x", getTag());
-  OS << "\tDW_CHILDREN_" << (hasChildren() ? "yes" : "no") << '\n';
-  for (const AttributeSpec &Spec : AttributeSpecs) {
-    OS << '\t';
-    auto attrString = AttributeString(Spec.Attr);
-    if (!attrString.empty())
-      OS << attrString;
-    else
-      OS << format("DW_AT_Unknown_%x", Spec.Attr);
-    OS << '\t';
-    auto formString = FormEncodingString(Spec.Form);
-    if (!formString.empty())
-      OS << formString;
-    else
-      OS << format("DW_FORM_Unknown_%x", Spec.Form);
-    if (Spec.isImplicitConst())
-      OS << '\t' << Spec.getImplicitConstValue();
-    OS << '\n';
-  }
-  OS << '\n';
-}
-
-Optional<uint32_t>
-DWARFAbbreviationDeclaration::findAttributeIndex(dwarf::Attribute Attr) const {
-  for (uint32_t i = 0, e = AttributeSpecs.size(); i != e; ++i) {
-    if (AttributeSpecs[i].Attr == Attr)
-      return i;
-  }
-  return None;
-}
-
-Optional<DWARFFormValue> DWARFAbbreviationDeclaration::getAttributeValue(
-    const uint32_t DIEOffset, const dwarf::Attribute Attr,
-    const DWARFUnit &U) const {
-  Optional<uint32_t> MatchAttrIndex = findAttributeIndex(Attr);
-  if (!MatchAttrIndex)
-    return None;
-
-  auto DebugInfoData = U.getDebugInfoExtractor();
-
-  // Add the byte size of ULEB that for the abbrev Code so we can start
-  // skipping the attribute data.
-  uint32_t Offset = DIEOffset + CodeByteSize;
-  uint32_t AttrIndex = 0;
-  for (const auto &Spec : AttributeSpecs) {
-    if (*MatchAttrIndex == AttrIndex) {
-      // We have arrived at the attribute to extract, extract if from Offset.
-      DWARFFormValue FormValue(Spec.Form);
-      if (Spec.isImplicitConst()) {
-        FormValue.setSValue(Spec.getImplicitConstValue());
-        return FormValue;
-      }
-      if (FormValue.extractValue(DebugInfoData, &Offset, U.getFormParams(), &U))
-        return FormValue;
-    }
-    // March Offset along until we get to the attribute we want.
-    if (auto FixedSize = Spec.getByteSize(U))
-      Offset += *FixedSize;
-    else
-      DWARFFormValue::skipValue(Spec.Form, DebugInfoData, &Offset,
-                                U.getFormParams());
-    ++AttrIndex;
-  }
-  return None;
-}
-
-size_t DWARFAbbreviationDeclaration::FixedSizeInfo::getByteSize(
-    const DWARFUnit &U) const {
-  size_t ByteSize = NumBytes;
-  if (NumAddrs)
-    ByteSize += NumAddrs * U.getAddressByteSize();
-  if (NumRefAddrs)
-    ByteSize += NumRefAddrs * U.getRefAddrByteSize();
-  if (NumDwarfOffsets)
-    ByteSize += NumDwarfOffsets * U.getDwarfOffsetByteSize();
-  return ByteSize;
-}
-
-Optional<int64_t> DWARFAbbreviationDeclaration::AttributeSpec::getByteSize(
-    const DWARFUnit &U) const {
-  if (isImplicitConst())
-    return 0;
-  if (ByteSize.HasByteSize)
-    return ByteSize.ByteSize;
-  Optional<int64_t> S;
-  auto FixedByteSize =
-      DWARFFormValue::getFixedByteSize(Form, U.getFormParams());
-  if (FixedByteSize)
-    S = *FixedByteSize;
-  return S;
-}
-
-Optional<size_t> DWARFAbbreviationDeclaration::getFixedAttributesByteSize(
-    const DWARFUnit &U) const {
-  if (FixedAttributeSize)
-    return FixedAttributeSize->getByteSize(U);
-  return None;
-}