1 files changed, 483 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/Object/GOFFObjectFile.cpp b/contrib/llvm-project/llvm/lib/Object/GOFFObjectFile.cpp
new file mode 100644
index 000000000000..76a13559ebfe
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Object/GOFFObjectFile.cpp
@@ -0,0 +1,483 @@
+//===- GOFFObjectFile.cpp - GOFF object file implementation -----*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementation of the GOFFObjectFile class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/GOFFObjectFile.h"
+#include "llvm/BinaryFormat/GOFF.h"
+#include "llvm/Object/GOFF.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/raw_ostream.h"
+
+#ifndef DEBUG_TYPE
+#define DEBUG_TYPE "goff"
+#endif
+
+using namespace llvm::object;
+using namespace llvm;
+
+Expected<std::unique_ptr<ObjectFile>>
+ObjectFile::createGOFFObjectFile(MemoryBufferRef Object) {
+  Error Err = Error::success();
+  std::unique_ptr<GOFFObjectFile> Ret(new GOFFObjectFile(Object, Err));
+  if (Err)
+    return std::move(Err);
+  return std::move(Ret);
+}
+
+GOFFObjectFile::GOFFObjectFile(MemoryBufferRef Object, Error &Err)
+    : ObjectFile(Binary::ID_GOFF, Object) {
+  ErrorAsOutParameter ErrAsOutParam(&Err);
+  // Object file isn't the right size, bail out early.
+  if ((Object.getBufferSize() % GOFF::RecordLength) != 0) {
+    Err = createStringError(
+        object_error::unexpected_eof,
+        "object file is not the right size. Must be a multiple "
+        "of 80 bytes, but is " +
+            std::to_string(Object.getBufferSize()) + " bytes");
+    return;
+  }
+  // Object file doesn't start/end with HDR/END records.
+  // Bail out early.
+  if (Object.getBufferSize() != 0) {
+    if ((base()[1] & 0xF0) >> 4 != GOFF::RT_HDR) {
+      Err = createStringError(object_error::parse_failed,
+                              "object file must start with HDR record");
+      return;
+    }
+    if ((base()[Object.getBufferSize() - GOFF::RecordLength + 1] & 0xF0) >> 4 !=
+        GOFF::RT_END) {
+      Err = createStringError(object_error::parse_failed,
+                              "object file must end with END record");
+      return;
+    }
+  }
+
+  SectionEntryImpl DummySection;
+  SectionList.emplace_back(DummySection); // Dummy entry at index 0.
+
+  uint8_t PrevRecordType = 0;
+  uint8_t PrevContinuationBits = 0;
+  const uint8_t *End = reinterpret_cast<const uint8_t *>(Data.getBufferEnd());
+  for (const uint8_t *I = base(); I < End; I += GOFF::RecordLength) {
+    uint8_t RecordType = (I[1] & 0xF0) >> 4;
+    bool IsContinuation = I[1] & 0x02;
+    bool PrevWasContinued = PrevContinuationBits & 0x01;
+    size_t RecordNum = (I - base()) / GOFF::RecordLength;
+
+    // If the previous record was continued, the current record should be a
+    // continuation.
+    if (PrevWasContinued && !IsContinuation) {
+      if (PrevRecordType == RecordType) {
+        Err = createStringError(object_error::parse_failed,
+                                "record " + std::to_string(RecordNum) +
+                                    " is not a continuation record but the "
+                                    "preceding record is continued");
+        return;
+      }
+    }
+    // Don't parse continuations records, only parse initial record.
+    if (IsContinuation) {
+      if (RecordType != PrevRecordType) {
+        Err = createStringError(object_error::parse_failed,
+                                "record " + std::to_string(RecordNum) +
+                                    " is a continuation record that does not "
+                                    "match the type of the previous record");
+        return;
+      }
+      if (!PrevWasContinued) {
+        Err = createStringError(object_error::parse_failed,
+                                "record " + std::to_string(RecordNum) +
+                                    " is a continuation record that is not "
+                                    "preceded by a continued record");
+        return;
+      }
+      PrevRecordType = RecordType;
+      PrevContinuationBits = I[1] & 0x03;
+      continue;
+    }
+
+#ifndef NDEBUG
+    for (size_t J = 0; J < GOFF::RecordLength; ++J) {
+      const uint8_t *P = I + J;
+      if (J % 8 == 0)
+        dbgs() << "  ";
+
+      dbgs() << format("%02hhX", *P);
+    }
+#endif
+    switch (RecordType) {
+    case GOFF::RT_ESD: {
+      // Save ESD record.
+      uint32_t EsdId;
+      ESDRecord::getEsdId(I, EsdId);
+      EsdPtrs.grow(EsdId);
+      EsdPtrs[EsdId] = I;
+
+      // Determine and save the "sections" in GOFF.
+      // A section is saved as a tuple of the form
+      // case (1): (ED,child PR)
+      //    - where the PR must have non-zero length.
+      // case (2a) (ED,0)
+      //   - where the ED is of non-zero length.
+      // case (2b) (ED,0)
+      //   - where the ED is zero length but
+      //     contains a label (LD).
+      GOFF::ESDSymbolType SymbolType;
+      ESDRecord::getSymbolType(I, SymbolType);
+      SectionEntryImpl Section;
+      uint32_t Length;
+      ESDRecord::getLength(I, Length);
+      if (SymbolType == GOFF::ESD_ST_ElementDefinition) {
+        // case (2a)
+        if (Length != 0) {
+          Section.d.a = EsdId;
+          SectionList.emplace_back(Section);
+        }
+      } else if (SymbolType == GOFF::ESD_ST_PartReference) {
+        // case (1)
+        if (Length != 0) {
+          uint32_t SymEdId;
+          ESDRecord::getParentEsdId(I, SymEdId);
+          Section.d.a = SymEdId;
+          Section.d.b = EsdId;
+          SectionList.emplace_back(Section);
+        }
+      } else if (SymbolType == GOFF::ESD_ST_LabelDefinition) {
+        // case (2b)
+        uint32_t SymEdId;
+        ESDRecord::getParentEsdId(I, SymEdId);
+        const uint8_t *SymEdRecord = EsdPtrs[SymEdId];
+        uint32_t EdLength;
+        ESDRecord::getLength(SymEdRecord, EdLength);
+        if (!EdLength) { // [ EDID, PRID ]
+          // LD child of a zero length parent ED.
+          // Add the section ED which was previously ignored.
+          Section.d.a = SymEdId;
+          SectionList.emplace_back(Section);
+        }
+      }
+      LLVM_DEBUG(dbgs() << "  --  ESD " << EsdId << "\n");
+      break;
+    }
+    case GOFF::RT_END:
+      LLVM_DEBUG(dbgs() << "  --  END (GOFF record type) unhandled\n");
+      break;
+    case GOFF::RT_HDR:
+      LLVM_DEBUG(dbgs() << "  --  HDR (GOFF record type) unhandled\n");
+      break;
+    default:
+      llvm_unreachable("Unknown record type");
+    }
+    PrevRecordType = RecordType;
+    PrevContinuationBits = I[1] & 0x03;
+  }
+}
+
+const uint8_t *GOFFObjectFile::getSymbolEsdRecord(DataRefImpl Symb) const {
+  const uint8_t *EsdRecord = EsdPtrs[Symb.d.a];
+  return EsdRecord;
+}
+
+Expected<StringRef> GOFFObjectFile::getSymbolName(DataRefImpl Symb) const {
+  if (EsdNamesCache.count(Symb.d.a)) {
+    auto &StrPtr = EsdNamesCache[Symb.d.a];
+    return StringRef(StrPtr.second.get(), StrPtr.first);
+  }
+
+  SmallString<256> SymbolName;
+  if (auto Err = ESDRecord::getData(getSymbolEsdRecord(Symb), SymbolName))
+    return std::move(Err);
+
+  SmallString<256> SymbolNameConverted;
+  ConverterEBCDIC::convertToUTF8(SymbolName, SymbolNameConverted);
+
+  size_t Size = SymbolNameConverted.size();
+  auto StrPtr = std::make_pair(Size, std::make_unique<char[]>(Size));
+  char *Buf = StrPtr.second.get();
+  memcpy(Buf, SymbolNameConverted.data(), Size);
+  EsdNamesCache[Symb.d.a] = std::move(StrPtr);
+  return StringRef(Buf, Size);
+}
+
+Expected<StringRef> GOFFObjectFile::getSymbolName(SymbolRef Symbol) const {
+  return getSymbolName(Symbol.getRawDataRefImpl());
+}
+
+Expected<uint64_t> GOFFObjectFile::getSymbolAddress(DataRefImpl Symb) const {
+  uint32_t Offset;
+  const uint8_t *EsdRecord = getSymbolEsdRecord(Symb);
+  ESDRecord::getOffset(EsdRecord, Offset);
+  return static_cast<uint64_t>(Offset);
+}
+
+uint64_t GOFFObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
+  uint32_t Offset;
+  const uint8_t *EsdRecord = getSymbolEsdRecord(Symb);
+  ESDRecord::getOffset(EsdRecord, Offset);
+  return static_cast<uint64_t>(Offset);
+}
+
+uint64_t GOFFObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
+  return 0;
+}
+
+bool GOFFObjectFile::isSymbolUnresolved(DataRefImpl Symb) const {
+  const uint8_t *Record = getSymbolEsdRecord(Symb);
+  GOFF::ESDSymbolType SymbolType;
+  ESDRecord::getSymbolType(Record, SymbolType);
+
+  if (SymbolType == GOFF::ESD_ST_ExternalReference)
+    return true;
+  if (SymbolType == GOFF::ESD_ST_PartReference) {
+    uint32_t Length;
+    ESDRecord::getLength(Record, Length);
+    if (Length == 0)
+      return true;
+  }
+  return false;
+}
+
+bool GOFFObjectFile::isSymbolIndirect(DataRefImpl Symb) const {
+  const uint8_t *Record = getSymbolEsdRecord(Symb);
+  bool Indirect;
+  ESDRecord::getIndirectReference(Record, Indirect);
+  return Indirect;
+}
+
+Expected<uint32_t> GOFFObjectFile::getSymbolFlags(DataRefImpl Symb) const {
+  uint32_t Flags = 0;
+  if (isSymbolUnresolved(Symb))
+    Flags |= SymbolRef::SF_Undefined;
+
+  const uint8_t *Record = getSymbolEsdRecord(Symb);
+
+  GOFF::ESDBindingStrength BindingStrength;
+  ESDRecord::getBindingStrength(Record, BindingStrength);
+  if (BindingStrength == GOFF::ESD_BST_Weak)
+    Flags |= SymbolRef::SF_Weak;
+
+  GOFF::ESDBindingScope BindingScope;
+  ESDRecord::getBindingScope(Record, BindingScope);
+
+  if (BindingScope != GOFF::ESD_BSC_Section) {
+    Expected<StringRef> Name = getSymbolName(Symb);
+    if (Name && *Name != " ") { // Blank name is local.
+      Flags |= SymbolRef::SF_Global;
+      if (BindingScope == GOFF::ESD_BSC_ImportExport)
+        Flags |= SymbolRef::SF_Exported;
+      else if (!(Flags & SymbolRef::SF_Undefined))
+        Flags |= SymbolRef::SF_Hidden;
+    }
+  }
+
+  return Flags;
+}
+
+Expected<SymbolRef::Type>
+GOFFObjectFile::getSymbolType(DataRefImpl Symb) const {
+  const uint8_t *Record = getSymbolEsdRecord(Symb);
+  GOFF::ESDSymbolType SymbolType;
+  ESDRecord::getSymbolType(Record, SymbolType);
+  GOFF::ESDExecutable Executable;
+  ESDRecord::getExecutable(Record, Executable);
+
+  if (SymbolType != GOFF::ESD_ST_SectionDefinition &&
+      SymbolType != GOFF::ESD_ST_ElementDefinition &&
+      SymbolType != GOFF::ESD_ST_LabelDefinition &&
+      SymbolType != GOFF::ESD_ST_PartReference &&
+      SymbolType != GOFF::ESD_ST_ExternalReference) {
+    uint32_t EsdId;
+    ESDRecord::getEsdId(Record, EsdId);
+    return createStringError(llvm::errc::invalid_argument,
+                             "ESD record %" PRIu32
+                             " has invalid symbol type 0x%02" PRIX8,
+                             EsdId, SymbolType);
+  }
+  switch (SymbolType) {
+  case GOFF::ESD_ST_SectionDefinition:
+  case GOFF::ESD_ST_ElementDefinition:
+    return SymbolRef::ST_Other;
+  case GOFF::ESD_ST_LabelDefinition:
+  case GOFF::ESD_ST_PartReference:
+  case GOFF::ESD_ST_ExternalReference:
+    if (Executable != GOFF::ESD_EXE_CODE && Executable != GOFF::ESD_EXE_DATA &&
+        Executable != GOFF::ESD_EXE_Unspecified) {
+      uint32_t EsdId;
+      ESDRecord::getEsdId(Record, EsdId);
+      return createStringError(llvm::errc::invalid_argument,
+                               "ESD record %" PRIu32
+                               " has unknown Executable type 0x%02X",
+                               EsdId, Executable);
+    }
+    switch (Executable) {
+    case GOFF::ESD_EXE_CODE:
+      return SymbolRef::ST_Function;
+    case GOFF::ESD_EXE_DATA:
+      return SymbolRef::ST_Data;
+    case GOFF::ESD_EXE_Unspecified:
+      return SymbolRef::ST_Unknown;
+    }
+    llvm_unreachable("Unhandled ESDExecutable");
+  }
+  llvm_unreachable("Unhandled ESDSymbolType");
+}
+
+Expected<section_iterator>
+GOFFObjectFile::getSymbolSection(DataRefImpl Symb) const {
+  DataRefImpl Sec;
+
+  if (isSymbolUnresolved(Symb))
+    return section_iterator(SectionRef(Sec, this));
+
+  const uint8_t *SymEsdRecord = EsdPtrs[Symb.d.a];
+  uint32_t SymEdId;
+  ESDRecord::getParentEsdId(SymEsdRecord, SymEdId);
+  const uint8_t *SymEdRecord = EsdPtrs[SymEdId];
+
+  for (size_t I = 0, E = SectionList.size(); I < E; ++I) {
+    bool Found;
+    const uint8_t *SectionPrRecord = getSectionPrEsdRecord(I);
+    if (SectionPrRecord) {
+      Found = SymEsdRecord == SectionPrRecord;
+    } else {
+      const uint8_t *SectionEdRecord = getSectionEdEsdRecord(I);
+      Found = SymEdRecord == SectionEdRecord;
+    }
+
+    if (Found) {
+      Sec.d.a = I;
+      return section_iterator(SectionRef(Sec, this));
+    }
+  }
+  return createStringError(llvm::errc::invalid_argument,
+                           "symbol with ESD id " + std::to_string(Symb.d.a) +
+                               " refers to invalid section with ESD id " +
+                               std::to_string(SymEdId));
+}
+
+const uint8_t *GOFFObjectFile::getSectionEdEsdRecord(DataRefImpl &Sec) const {
+  SectionEntryImpl EsdIds = SectionList[Sec.d.a];
+  const uint8_t *EsdRecord = EsdPtrs[EsdIds.d.a];
+  return EsdRecord;
+}
+
+const uint8_t *GOFFObjectFile::getSectionPrEsdRecord(DataRefImpl &Sec) const {
+  SectionEntryImpl EsdIds = SectionList[Sec.d.a];
+  const uint8_t *EsdRecord = nullptr;
+  if (EsdIds.d.b)
+    EsdRecord = EsdPtrs[EsdIds.d.b];
+  return EsdRecord;
+}
+
+const uint8_t *
+GOFFObjectFile::getSectionEdEsdRecord(uint32_t SectionIndex) const {
+  DataRefImpl Sec;
+  Sec.d.a = SectionIndex;
+  const uint8_t *EsdRecord = getSectionEdEsdRecord(Sec);
+  return EsdRecord;
+}
+
+const uint8_t *
+GOFFObjectFile::getSectionPrEsdRecord(uint32_t SectionIndex) const {
+  DataRefImpl Sec;
+  Sec.d.a = SectionIndex;
+  const uint8_t *EsdRecord = getSectionPrEsdRecord(Sec);
+  return EsdRecord;
+}
+
+section_iterator GOFFObjectFile::section_begin() const {
+  DataRefImpl Sec;
+  moveSectionNext(Sec);
+  return section_iterator(SectionRef(Sec, this));
+}
+
+section_iterator GOFFObjectFile::section_end() const {
+  DataRefImpl Sec;
+  return section_iterator(SectionRef(Sec, this));
+}
+
+void GOFFObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
+  for (uint32_t I = Symb.d.a + 1, E = EsdPtrs.size(); I < E; ++I) {
+    if (EsdPtrs[I]) {
+      const uint8_t *EsdRecord = EsdPtrs[I];
+      GOFF::ESDSymbolType SymbolType;
+      ESDRecord::getSymbolType(EsdRecord, SymbolType);
+      // Skip EDs - i.e. section symbols.
+      bool IgnoreSpecialGOFFSymbols = true;
+      bool SkipSymbol = ((SymbolType == GOFF::ESD_ST_ElementDefinition) ||
+                         (SymbolType == GOFF::ESD_ST_SectionDefinition)) &&
+                        IgnoreSpecialGOFFSymbols;
+      if (!SkipSymbol) {
+        Symb.d.a = I;
+        return;
+      }
+    }
+  }
+  Symb.d.a = 0;
+}
+
+basic_symbol_iterator GOFFObjectFile::symbol_begin() const {
+  DataRefImpl Symb;
+  moveSymbolNext(Symb);
+  return basic_symbol_iterator(SymbolRef(Symb, this));
+}
+
+basic_symbol_iterator GOFFObjectFile::symbol_end() const {
+  DataRefImpl Symb;
+  return basic_symbol_iterator(SymbolRef(Symb, this));
+}
+
+Error Record::getContinuousData(const uint8_t *Record, uint16_t DataLength,
+                                int DataIndex, SmallString<256> &CompleteData) {
+  // First record.
+  const uint8_t *Slice = Record + DataIndex;
+  size_t SliceLength =
+      std::min(DataLength, (uint16_t)(GOFF::RecordLength - DataIndex));
+  CompleteData.append(Slice, Slice + SliceLength);
+  DataLength -= SliceLength;
+  Slice += SliceLength;
+
+  // Continuation records.
+  for (; DataLength > 0;
+       DataLength -= SliceLength, Slice += GOFF::PayloadLength) {
+    // Slice points to the start of the new record.
+    // Check that this block is a Continuation.
+    assert(Record::isContinuation(Slice) && "Continuation bit must be set");
+    // Check that the last Continuation is terminated correctly.
+    if (DataLength <= 77 && Record::isContinued(Slice))
+      return createStringError(object_error::parse_failed,
+                               "continued bit should not be set");
+
+    SliceLength = std::min(DataLength, (uint16_t)GOFF::PayloadLength);
+    Slice += GOFF::RecordPrefixLength;
+    CompleteData.append(Slice, Slice + SliceLength);
+  }
+  return Error::success();
+}
+
+Error HDRRecord::getData(const uint8_t *Record,
+                         SmallString<256> &CompleteData) {
+  uint16_t Length = getPropertyModuleLength(Record);
+  return getContinuousData(Record, Length, 60, CompleteData);
+}
+
+Error ESDRecord::getData(const uint8_t *Record,
+                         SmallString<256> &CompleteData) {
+  uint16_t DataSize = getNameLength(Record);
+  return getContinuousData(Record, DataSize, 72, CompleteData);
+}
+
+Error ENDRecord::getData(const uint8_t *Record,
+                         SmallString<256> &CompleteData) {
+  uint16_t Length = getNameLength(Record);
+  return getContinuousData(Record, Length, 26, CompleteData);
+}