Move DebugInfo to DebugInfo/DWARF.

In preparation for adding PDB support to LLVM, this moves the
DWARF parsing code to its own subdirectory under DebugInfo, and
renames LLVMDebugInfo to LLVMDebugInfoDWARF.

This is purely a mechanical / build system change.

Differential Revision: http://reviews.llvm.org/D7269
Reviewed by: Eric Christopher

llvm-svn: 227586

1 files changed, 0 insertions, 377 deletions

diff --git a/llvm/lib/DebugInfo/DWARFUnit.cpp b/llvm/lib/DebugInfo/DWARFUnit.cpp
deleted file mode 100644
index 395a179f14b..00000000000
--- a/llvm/lib/DebugInfo/DWARFUnit.cpp
+++ /dev/null
@@ -1,377 +0,0 @@
-//===-- DWARFUnit.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/DWARFUnit.h"
-#include "llvm/DebugInfo/DWARFContext.h"
-#include "llvm/DebugInfo/DWARFFormValue.h"
-#include "llvm/Support/Dwarf.h"
-#include "llvm/Support/Path.h"
-#include <cstdio>
-
-using namespace llvm;
-using namespace dwarf;
-
-void DWARFUnitSectionBase::parse(DWARFContext &C, const DWARFSection &Section) {
-  parseImpl(C, Section, C.getDebugAbbrev(), C.getRangeSection(),
-            C.getStringSection(), StringRef(), C.getAddrSection(),
-            C.isLittleEndian());
-}
-
-void DWARFUnitSectionBase::parseDWO(DWARFContext &C,
-                                    const DWARFSection &DWOSection) {
-  parseImpl(C, DWOSection, C.getDebugAbbrevDWO(), C.getRangeDWOSection(),
-            C.getStringDWOSection(), C.getStringOffsetDWOSection(),
-            C.getAddrSection(), C.isLittleEndian());
-}
-
-DWARFUnit::DWARFUnit(DWARFContext &DC, const DWARFSection &Section,
-                     const DWARFDebugAbbrev *DA, StringRef RS, StringRef SS,
-                     StringRef SOS, StringRef AOS, bool LE,
-                     const DWARFUnitSectionBase &UnitSection)
-    : Context(DC), InfoSection(Section), Abbrev(DA), RangeSection(RS),
-      StringSection(SS), StringOffsetSection(SOS), AddrOffsetSection(AOS),
-      isLittleEndian(LE), UnitSection(UnitSection) {
-  clear();
-}
-
-DWARFUnit::~DWARFUnit() {
-}
-
-bool DWARFUnit::getAddrOffsetSectionItem(uint32_t Index,
-                                                uint64_t &Result) const {
-  uint32_t Offset = AddrOffsetSectionBase + Index * AddrSize;
-  if (AddrOffsetSection.size() < Offset + AddrSize)
-    return false;
-  DataExtractor DA(AddrOffsetSection, isLittleEndian, AddrSize);
-  Result = DA.getAddress(&Offset);
-  return true;
-}
-
-bool DWARFUnit::getStringOffsetSectionItem(uint32_t Index,
-                                                  uint32_t &Result) const {
-  // FIXME: string offset section entries are 8-byte for DWARF64.
-  const uint32_t ItemSize = 4;
-  uint32_t Offset = Index * ItemSize;
-  if (StringOffsetSection.size() < Offset + ItemSize)
-    return false;
-  DataExtractor DA(StringOffsetSection, isLittleEndian, 0);
-  Result = DA.getU32(&Offset);
-  return true;
-}
-
-bool DWARFUnit::extractImpl(DataExtractor debug_info, uint32_t *offset_ptr) {
-  Length = debug_info.getU32(offset_ptr);
-  Version = debug_info.getU16(offset_ptr);
-  uint64_t AbbrOffset = debug_info.getU32(offset_ptr);
-  AddrSize = debug_info.getU8(offset_ptr);
-
-  bool LengthOK = debug_info.isValidOffset(getNextUnitOffset() - 1);
-  bool VersionOK = DWARFContext::isSupportedVersion(Version);
-  bool AddrSizeOK = AddrSize == 4 || AddrSize == 8;
-
-  if (!LengthOK || !VersionOK || !AddrSizeOK)
-    return false;
-
-  Abbrevs = Abbrev->getAbbreviationDeclarationSet(AbbrOffset);
-  if (Abbrevs == nullptr)
-    return false;
-
-  return true;
-}
-
-bool DWARFUnit::extract(DataExtractor debug_info, uint32_t *offset_ptr) {
-  clear();
-
-  Offset = *offset_ptr;
-
-  if (debug_info.isValidOffset(*offset_ptr)) {
-    if (extractImpl(debug_info, offset_ptr))
-      return true;
-
-    // reset the offset to where we tried to parse from if anything went wrong
-    *offset_ptr = Offset;
-  }
-
-  return false;
-}
-
-bool DWARFUnit::extractRangeList(uint32_t RangeListOffset,
-                                        DWARFDebugRangeList &RangeList) const {
-  // Require that compile unit is extracted.
-  assert(DieArray.size() > 0);
-  DataExtractor RangesData(RangeSection, isLittleEndian, AddrSize);
-  uint32_t ActualRangeListOffset = RangeSectionBase + RangeListOffset;
-  return RangeList.extract(RangesData, &ActualRangeListOffset);
-}
-
-void DWARFUnit::clear() {
-  Offset = 0;
-  Length = 0;
-  Version = 0;
-  Abbrevs = nullptr;
-  AddrSize = 0;
-  BaseAddr = 0;
-  RangeSectionBase = 0;
-  AddrOffsetSectionBase = 0;
-  clearDIEs(false);
-  DWO.reset();
-}
-
-const char *DWARFUnit::getCompilationDir() {
-  extractDIEsIfNeeded(true);
-  if (DieArray.empty())
-    return nullptr;
-  return DieArray[0].getAttributeValueAsString(this, DW_AT_comp_dir, nullptr);
-}
-
-uint64_t DWARFUnit::getDWOId() {
-  extractDIEsIfNeeded(true);
-  const uint64_t FailValue = -1ULL;
-  if (DieArray.empty())
-    return FailValue;
-  return DieArray[0]
-      .getAttributeValueAsUnsignedConstant(this, DW_AT_GNU_dwo_id, FailValue);
-}
-
-void DWARFUnit::setDIERelations() {
-  if (DieArray.size() <= 1)
-    return;
-
-  std::vector<DWARFDebugInfoEntryMinimal *> ParentChain;
-  DWARFDebugInfoEntryMinimal *SiblingChain = nullptr;
-  for (auto &DIE : DieArray) {
-    if (SiblingChain) {
-      SiblingChain->setSibling(&DIE);
-    }
-    if (const DWARFAbbreviationDeclaration *AbbrDecl =
-            DIE.getAbbreviationDeclarationPtr()) {
-      // Normal DIE.
-      if (AbbrDecl->hasChildren()) {
-        ParentChain.push_back(&DIE);
-        SiblingChain = nullptr;
-      } else {
-        SiblingChain = &DIE;
-      }
-    } else {
-      // NULL entry terminates the sibling chain.
-      SiblingChain = ParentChain.back();
-      ParentChain.pop_back();
-    }
-  }
-  assert(SiblingChain == nullptr || SiblingChain == &DieArray[0]);
-  assert(ParentChain.empty());
-}
-
-void DWARFUnit::extractDIEsToVector(
-    bool AppendCUDie, bool AppendNonCUDies,
-    std::vector<DWARFDebugInfoEntryMinimal> &Dies) const {
-  if (!AppendCUDie && !AppendNonCUDies)
-    return;
-
-  // Set the offset to that of the first DIE and calculate the start of the
-  // next compilation unit header.
-  uint32_t DIEOffset = Offset + getHeaderSize();
-  uint32_t NextCUOffset = getNextUnitOffset();
-  DWARFDebugInfoEntryMinimal DIE;
-  uint32_t Depth = 0;
-  bool IsCUDie = true;
-
-  while (DIEOffset < NextCUOffset && DIE.extractFast(this, &DIEOffset)) {
-    if (IsCUDie) {
-      if (AppendCUDie)
-        Dies.push_back(DIE);
-      if (!AppendNonCUDies)
-        break;
-      // The average bytes per DIE entry has been seen to be
-      // around 14-20 so let's pre-reserve the needed memory for
-      // our DIE entries accordingly.
-      Dies.reserve(Dies.size() + getDebugInfoSize() / 14);
-      IsCUDie = false;
-    } else {
-      Dies.push_back(DIE);
-    }
-
-    if (const DWARFAbbreviationDeclaration *AbbrDecl =
-            DIE.getAbbreviationDeclarationPtr()) {
-      // Normal DIE
-      if (AbbrDecl->hasChildren())
-        ++Depth;
-    } else {
-      // NULL DIE.
-      if (Depth > 0)
-        --Depth;
-      if (Depth == 0)
-        break;  // We are done with this compile unit!
-    }
-  }
-
-  // Give a little bit of info if we encounter corrupt DWARF (our offset
-  // should always terminate at or before the start of the next compilation
-  // unit header).
-  if (DIEOffset > NextCUOffset)
-    fprintf(stderr, "warning: DWARF compile unit extends beyond its "
-                    "bounds cu 0x%8.8x at 0x%8.8x'\n", getOffset(), DIEOffset);
-}
-
-size_t DWARFUnit::extractDIEsIfNeeded(bool CUDieOnly) {
-  if ((CUDieOnly && DieArray.size() > 0) ||
-      DieArray.size() > 1)
-    return 0; // Already parsed.
-
-  bool HasCUDie = DieArray.size() > 0;
-  extractDIEsToVector(!HasCUDie, !CUDieOnly, DieArray);
-
-  if (DieArray.empty())
-    return 0;
-
-  // If CU DIE was just parsed, copy several attribute values from it.
-  if (!HasCUDie) {
-    uint64_t BaseAddr =
-        DieArray[0].getAttributeValueAsAddress(this, DW_AT_low_pc, -1ULL);
-    if (BaseAddr == -1ULL)
-      BaseAddr = DieArray[0].getAttributeValueAsAddress(this, DW_AT_entry_pc, 0);
-    setBaseAddress(BaseAddr);
-    AddrOffsetSectionBase = DieArray[0].getAttributeValueAsSectionOffset(
-        this, DW_AT_GNU_addr_base, 0);
-    RangeSectionBase = DieArray[0].getAttributeValueAsSectionOffset(
-        this, DW_AT_ranges_base, 0);
-    // Don't fall back to DW_AT_GNU_ranges_base: it should be ignored for
-    // skeleton CU DIE, so that DWARF users not aware of it are not broken.
-  }
-
-  setDIERelations();
-  return DieArray.size();
-}
-
-DWARFUnit::DWOHolder::DWOHolder(StringRef DWOPath)
-    : DWOFile(), DWOContext(), DWOU(nullptr) {
-  auto Obj = object::ObjectFile::createObjectFile(DWOPath);
-  if (!Obj)
-    return;
-  DWOFile = std::move(Obj.get());
-  DWOContext.reset(
-      cast<DWARFContext>(DIContext::getDWARFContext(*DWOFile.getBinary())));
-  if (DWOContext->getNumDWOCompileUnits() > 0)
-    DWOU = DWOContext->getDWOCompileUnitAtIndex(0);
-}
-
-bool DWARFUnit::parseDWO() {
-  if (DWO.get())
-    return false;
-  extractDIEsIfNeeded(true);
-  if (DieArray.empty())
-    return false;
-  const char *DWOFileName =
-      DieArray[0].getAttributeValueAsString(this, DW_AT_GNU_dwo_name, nullptr);
-  if (!DWOFileName)
-    return false;
-  const char *CompilationDir =
-      DieArray[0].getAttributeValueAsString(this, DW_AT_comp_dir, nullptr);
-  SmallString<16> AbsolutePath;
-  if (sys::path::is_relative(DWOFileName) && CompilationDir != nullptr) {
-    sys::path::append(AbsolutePath, CompilationDir);
-  }
-  sys::path::append(AbsolutePath, DWOFileName);
-  DWO = llvm::make_unique<DWOHolder>(AbsolutePath);
-  DWARFUnit *DWOCU = DWO->getUnit();
-  // Verify that compile unit in .dwo file is valid.
-  if (!DWOCU || DWOCU->getDWOId() != getDWOId()) {
-    DWO.reset();
-    return false;
-  }
-  // Share .debug_addr and .debug_ranges section with compile unit in .dwo
-  DWOCU->setAddrOffsetSection(AddrOffsetSection, AddrOffsetSectionBase);
-  uint32_t DWORangesBase = DieArray[0].getRangesBaseAttribute(this, 0);
-  DWOCU->setRangesSection(RangeSection, DWORangesBase);
-  return true;
-}
-
-void DWARFUnit::clearDIEs(bool KeepCUDie) {
-  if (DieArray.size() > (unsigned)KeepCUDie) {
-    // std::vectors never get any smaller when resized to a smaller size,
-    // or when clear() or erase() are called, the size will report that it
-    // is smaller, but the memory allocated remains intact (call capacity()
-    // to see this). So we need to create a temporary vector and swap the
-    // contents which will cause just the internal pointers to be swapped
-    // so that when temporary vector goes out of scope, it will destroy the
-    // contents.
-    std::vector<DWARFDebugInfoEntryMinimal> TmpArray;
-    DieArray.swap(TmpArray);
-    // Save at least the compile unit DIE
-    if (KeepCUDie)
-      DieArray.push_back(TmpArray.front());
-  }
-}
-
-void DWARFUnit::collectAddressRanges(DWARFAddressRangesVector &CURanges) {
-  // First, check if CU DIE describes address ranges for the unit.
-  const auto &CUDIERanges = getCompileUnitDIE()->getAddressRanges(this);
-  if (!CUDIERanges.empty()) {
-    CURanges.insert(CURanges.end(), CUDIERanges.begin(), CUDIERanges.end());
-    return;
-  }
-
-  // This function is usually called if there in no .debug_aranges section
-  // in order to produce a compile unit level set of address ranges that
-  // is accurate. If the DIEs weren't parsed, then we don't want all dies for
-  // all compile units to stay loaded when they weren't needed. So we can end
-  // up parsing the DWARF and then throwing them all away to keep memory usage
-  // down.
-  const bool ClearDIEs = extractDIEsIfNeeded(false) > 1;
-  DieArray[0].collectChildrenAddressRanges(this, CURanges);
-
-  // Collect address ranges from DIEs in .dwo if necessary.
-  bool DWOCreated = parseDWO();
-  if (DWO.get())
-    DWO->getUnit()->collectAddressRanges(CURanges);
-  if (DWOCreated)
-    DWO.reset();
-
-  // Keep memory down by clearing DIEs if this generate function
-  // caused them to be parsed.
-  if (ClearDIEs)
-    clearDIEs(true);
-}
-
-const DWARFDebugInfoEntryMinimal *
-DWARFUnit::getSubprogramForAddress(uint64_t Address) {
-  extractDIEsIfNeeded(false);
-  for (const DWARFDebugInfoEntryMinimal &DIE : DieArray) {
-    if (DIE.isSubprogramDIE() &&
-        DIE.addressRangeContainsAddress(this, Address)) {
-      return &DIE;
-    }
-  }
-  return nullptr;
-}
-
-DWARFDebugInfoEntryInlinedChain
-DWARFUnit::getInlinedChainForAddress(uint64_t Address) {
-  // First, find a subprogram that contains the given address (the root
-  // of inlined chain).
-  const DWARFUnit *ChainCU = nullptr;
-  const DWARFDebugInfoEntryMinimal *SubprogramDIE =
-      getSubprogramForAddress(Address);
-  if (SubprogramDIE) {
-    ChainCU = this;
-  } else {
-    // Try to look for subprogram DIEs in the DWO file.
-    parseDWO();
-    if (DWO.get()) {
-      SubprogramDIE = DWO->getUnit()->getSubprogramForAddress(Address);
-      if (SubprogramDIE)
-        ChainCU = DWO->getUnit();
-    }
-  }
-
-  // Get inlined chain rooted at this subprogram DIE.
-  if (!SubprogramDIE)
-    return DWARFDebugInfoEntryInlinedChain();
-  return SubprogramDIE->getInlinedChainForAddress(ChainCU, Address);
-}