DIDT_AppleNamespaces,
DIDT_AppleObjC,
DIDT_CUIndex,
+ DIDT_GdbIndex,
DIDT_TUIndex,
};
#include "llvm/DebugInfo/DWARF/DWARFDebugLoc.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugMacro.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
+#include "llvm/DebugInfo/DWARF/DWARFGdbIndex.h"
#include "llvm/DebugInfo/DWARF/DWARFSection.h"
#include "llvm/DebugInfo/DWARF/DWARFTypeUnit.h"
DWARFUnitSection<DWARFCompileUnit> CUs;
std::deque<DWARFUnitSection<DWARFTypeUnit>> TUs;
std::unique_ptr<DWARFUnitIndex> CUIndex;
+ std::unique_ptr<DWARFGdbIndex> GdbIndex;
std::unique_ptr<DWARFUnitIndex> TUIndex;
std::unique_ptr<DWARFDebugAbbrev> Abbrev;
std::unique_ptr<DWARFDebugLoc> Loc;
}
const DWARFUnitIndex &getCUIndex();
+ DWARFGdbIndex &getGdbIndex();
const DWARFUnitIndex &getTUIndex();
/// Get a pointer to the parsed DebugAbbrev object.
virtual const DWARFSection& getAppleNamespacesSection() = 0;
virtual const DWARFSection& getAppleObjCSection() = 0;
virtual StringRef getCUIndexSection() = 0;
+ virtual StringRef getGdbIndexSection() = 0;
virtual StringRef getTUIndexSection() = 0;
static bool isSupportedVersion(unsigned version) {
DWARFSection AppleNamespacesSection;
DWARFSection AppleObjCSection;
StringRef CUIndexSection;
+ StringRef GdbIndexSection;
StringRef TUIndexSection;
SmallVector<SmallString<32>, 4> UncompressedSections;
return AddrSection;
}
StringRef getCUIndexSection() override { return CUIndexSection; }
+ StringRef getGdbIndexSection() override { return GdbIndexSection; }
StringRef getTUIndexSection() override { return TUIndexSection; }
};
--- /dev/null
+//===-- DWARFGdbIndex.h -----------------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_DEBUGINFO_DWARFGDBINDEX_H
+#define LLVM_LIB_DEBUGINFO_DWARFGDBINDEX_H
+
+#include "llvm/Support/DataExtractor.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+class DWARFGdbIndex {
+ uint32_t Version;
+
+ uint32_t CuListOffset;
+ uint32_t AddressAreaOffset;
+ uint32_t SymbolTableOffset;
+ uint32_t ConstantPoolOffset;
+
+ struct CompUnitEntry {
+ uint64_t Offset; // Offset of a CU in the .debug_info section.
+ uint64_t Length; // Length of that CU.
+ };
+ SmallVector<CompUnitEntry, 0> CuList;
+
+ struct AddressEntry {
+ uint64_t LowAddress; // The low address.
+ uint64_t HighAddress; // The high address.
+ uint32_t CuIndex; // The CU index.
+ };
+ SmallVector<AddressEntry, 0> AddressArea;
+
+ struct SymTableEntry {
+ uint32_t NameOffset; // Offset of the symbol's name in the constant pool.
+ uint32_t VecOffset; // Offset of the CU vector in the constant pool.
+ };
+ SmallVector<SymTableEntry, 0> SymbolTable;
+
+ // Each value is CU index + attributes.
+ SmallVector<std::pair<uint32_t, SmallVector<uint32_t, 0>>, 0>
+ ConstantPoolVectors;
+
+ StringRef ConstantPoolStrings;
+ uint32_t StringPoolOffset;
+
+ void dumpCUList(raw_ostream &OS) const;
+ void dumpAddressArea(raw_ostream &OS) const;
+ void dumpSymbolTable(raw_ostream &OS) const;
+ void dumpConstantPool(raw_ostream &OS) const;
+
+ bool parseImpl(DataExtractor Data);
+
+public:
+ void dump(raw_ostream &OS);
+ void parse(DataExtractor Data);
+
+ bool HasContent = false;
+ bool HasError = false;
+};
+}
+
+#endif // LLVM_LIB_DEBUGINFO_DWARFGDBINDEX_H
DWARFDebugMacro.cpp
DWARFDebugRangeList.cpp
DWARFFormValue.cpp
+ DWARFGdbIndex.cpp
DWARFTypeUnit.cpp
DWARFUnitIndex.cpp
DWARFUnit.cpp
}
}
+ if ((DumpType == DIDT_All || DumpType == DIDT_GdbIndex) &&
+ !getGdbIndexSection().empty()) {
+ OS << "\n.gnu_index contents:\n";
+ getGdbIndex().dump(OS);
+ }
+
if (DumpType == DIDT_All || DumpType == DIDT_AppleNames)
dumpAccelSection(OS, "apple_names", getAppleNamesSection(),
getStringSection(), isLittleEndian());
return *TUIndex;
}
+DWARFGdbIndex &DWARFContext::getGdbIndex() {
+ if (GdbIndex)
+ return *GdbIndex;
+
+ DataExtractor GdbIndexData(getGdbIndexSection(), true /*LE*/, 0);
+ GdbIndex = llvm::make_unique<DWARFGdbIndex>();
+ GdbIndex->parse(GdbIndexData);
+ return *GdbIndex;
+}
+
const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
if (Abbrev)
return Abbrev.get();
.Case("apple_objc", &AppleObjCSection.Data)
.Case("debug_cu_index", &CUIndexSection)
.Case("debug_tu_index", &TUIndexSection)
+ .Case("gdb_index", &GdbIndexSection)
// Any more debug info sections go here.
.Default(nullptr);
if (SectionData) {
--- /dev/null
+//===-- DWARFGdbIndex.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/DWARFGdbIndex.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Format.h"
+
+using namespace llvm;
+
+// .gdb_index section format reference:
+// https://sourceware.org/gdb/onlinedocs/gdb/Index-Section-Format.html
+
+void DWARFGdbIndex::dumpCUList(raw_ostream &OS) const {
+ OS << format("\n CU list offset = 0x%x, has %zu entries:", CuListOffset,
+ CuList.size())
+ << '\n';
+ uint32_t I = 0;
+ for (const CompUnitEntry &CU : CuList)
+ OS << format(" %d: Offset = 0x%llx, Length = 0x%llx\n", I++, CU.Offset,
+ CU.Length);
+}
+
+void DWARFGdbIndex::dumpAddressArea(raw_ostream &OS) const {
+ OS << format("\n Address area offset = 0x%x, has %zu entries:",
+ AddressAreaOffset, AddressArea.size())
+ << '\n';
+ for (const AddressEntry &Addr : AddressArea)
+ OS << format(
+ " Low address = 0x%llx, High address = 0x%llx, CU index = %d\n",
+ Addr.LowAddress, Addr.HighAddress, Addr.CuIndex);
+}
+
+void DWARFGdbIndex::dumpSymbolTable(raw_ostream &OS) const {
+ OS << format("\n Symbol table offset = 0x%x, size = %zu, filled slots:",
+ SymbolTableOffset, SymbolTable.size())
+ << '\n';
+ uint32_t I = -1;
+ for (const SymTableEntry &E : SymbolTable) {
+ ++I;
+ if (!E.NameOffset && !E.VecOffset)
+ continue;
+
+ OS << format(" %d: Name offset = 0x%x, CU vector offset = 0x%x\n", I,
+ E.NameOffset, E.VecOffset);
+
+ StringRef Name = ConstantPoolStrings.substr(
+ ConstantPoolOffset - StringPoolOffset + E.NameOffset);
+
+ auto CuVector = std::find_if(
+ ConstantPoolVectors.begin(), ConstantPoolVectors.end(),
+ [&](const std::pair<uint32_t, SmallVector<uint32_t, 0>> &V) {
+ return V.first == E.VecOffset;
+ });
+ assert(CuVector != ConstantPoolVectors.end() && "Invalid symbol table");
+ uint32_t CuVectorId = CuVector - ConstantPoolVectors.begin();
+ OS << format(" String name: %s, CU vector index: %d\n", Name.data(),
+ CuVectorId);
+ }
+}
+
+void DWARFGdbIndex::dumpConstantPool(raw_ostream &OS) const {
+ OS << format("\n Constant pool offset = 0x%x, has %zu CU vectors:",
+ ConstantPoolOffset, ConstantPoolVectors.size());
+ uint32_t I = 0;
+ for (const auto &V : ConstantPoolVectors) {
+ OS << format("\n %d(0x%x): ", I++, V.first);
+ for (uint32_t Val : V.second)
+ OS << format("0x%x ", Val);
+ }
+ OS << '\n';
+}
+
+void DWARFGdbIndex::dump(raw_ostream &OS) {
+ if (HasError) {
+ OS << "\n<error parsing>\n";
+ return;
+ }
+
+ if (HasContent) {
+ OS << " Version = " << Version << '\n';
+ dumpCUList(OS);
+ dumpAddressArea(OS);
+ dumpSymbolTable(OS);
+ dumpConstantPool(OS);
+ }
+}
+
+bool DWARFGdbIndex::parseImpl(DataExtractor Data) {
+ uint32_t Offset = 0;
+
+ // Only version 7 is supported at this moment.
+ Version = Data.getU32(&Offset);
+ if (Version != 7)
+ return false;
+
+ CuListOffset = Data.getU32(&Offset);
+ uint32_t CuTypesOffset = Data.getU32(&Offset);
+ AddressAreaOffset = Data.getU32(&Offset);
+ SymbolTableOffset = Data.getU32(&Offset);
+ ConstantPoolOffset = Data.getU32(&Offset);
+
+ if (Offset != CuListOffset)
+ return false;
+
+ uint32_t CuListSize = (CuTypesOffset - CuListOffset) / 16;
+ CuList.reserve(CuListSize);
+ for (uint32_t i = 0; i < CuListSize; ++i) {
+ uint64_t CuOffset = Data.getU64(&Offset);
+ uint64_t CuLength = Data.getU64(&Offset);
+ CuList.push_back({CuOffset, CuLength});
+ }
+
+ // CU Types are no longer needed as DWARF skeleton type units never made it
+ // into the standard.
+ uint32_t CuTypesListSize = (AddressAreaOffset - CuTypesOffset) / 24;
+ if (CuTypesListSize != 0)
+ return false;
+
+ uint32_t AddressAreaSize = (SymbolTableOffset - AddressAreaOffset) / 20;
+ AddressArea.reserve(AddressAreaSize);
+ for (uint32_t i = 0; i < AddressAreaSize; ++i) {
+ uint64_t LowAddress = Data.getU64(&Offset);
+ uint64_t HighAddress = Data.getU64(&Offset);
+ uint32_t CuIndex = Data.getU32(&Offset);
+ AddressArea.push_back({LowAddress, HighAddress, CuIndex});
+ }
+
+ // The symbol table. This is an open addressed hash table. The size of the
+ // hash table is always a power of 2.
+ // Each slot in the hash table consists of a pair of offset_type values. The
+ // first value is the offset of the symbol's name in the constant pool. The
+ // second value is the offset of the CU vector in the constant pool.
+ // If both values are 0, then this slot in the hash table is empty. This is ok
+ // because while 0 is a valid constant pool index, it cannot be a valid index
+ // for both a string and a CU vector.
+ uint32_t SymTableSize = (ConstantPoolOffset - SymbolTableOffset) / 8;
+ SymbolTable.reserve(SymTableSize);
+ uint32_t CuVectorsTotal = 0;
+ for (uint32_t i = 0; i < SymTableSize; ++i) {
+ uint32_t NameOffset = Data.getU32(&Offset);
+ uint32_t CuVecOffset = Data.getU32(&Offset);
+ SymbolTable.push_back({NameOffset, CuVecOffset});
+ if (NameOffset || CuVecOffset)
+ ++CuVectorsTotal;
+ }
+
+ // The constant pool. CU vectors are stored first, followed by strings.
+ // The first value is the number of CU indices in the vector. Each subsequent
+ // value is the index and symbol attributes of a CU in the CU list.
+ for (uint32_t i = 0; i < CuVectorsTotal; ++i) {
+ ConstantPoolVectors.emplace_back(0, SmallVector<uint32_t, 0>());
+ auto &Vec = ConstantPoolVectors.back();
+ Vec.first = Offset - ConstantPoolOffset;
+
+ uint32_t Num = Data.getU32(&Offset);
+ for (uint32_t j = 0; j < Num; ++j)
+ Vec.second.push_back(Data.getU32(&Offset));
+ }
+
+ ConstantPoolStrings = Data.getData().drop_front(Offset);
+ StringPoolOffset = Offset;
+ return true;
+}
+
+void DWARFGdbIndex::parse(DataExtractor Data) {
+ HasContent = !Data.getData().empty();
+ HasError = HasContent && !parseImpl(Data);
+}
--- /dev/null
+RUN: llvm-dwarfdump -debug-dump=gdb_index %p/Inputs/dwarfdump-gdbindex-v7.elf-x86-64 | FileCheck %s
+
+; test.cpp:
+; int main() { return 0; }
+; test2.cpp:
+; int main2() { return 0; }
+; Compiled with:
+; gcc -gsplit-dwarf -c test.cpp test2.cpp
+; gold --gdb-index test.o test2.o -o dwarfdump-gdbindex-v7.elf-x86-64
+; gcc version 5.3.1 20160413, GNU gold (GNU Binutils for Ubuntu 2.26) 1.11
+; Info about gdb-index: https://sourceware.org/gdb/onlinedocs/gdb/Index-Section-Format.html
+
+; CHECK-LABEL: .gnu_index contents:
+; CHECK: Version = 7
+
+; CHECK: CU list offset = 0x18, has 2 entries:
+; CHECK-NEXT: 0: Offset = 0x0, Length = 0x34
+; CHECK-NEXT: 1: Offset = 0x34, Length = 0x34
+
+; CHECK: Address area offset = 0x38, has 2 entries:
+; CHECK-NEXT: Low address = 0x4000e8, High address = 0x4000f3, CU index = 0
+; CHECK-NEXT: Low address = 0x4000f3, High address = 0x4000fe, CU index = 1
+
+; CHECK: Symbol table offset = 0x60, size = 1024, filled slots:
+; CHECK-NEXT: 489: Name offset = 0x1d, CU vector offset = 0x0
+; CHECK-NEXT: String name: main, CU vector index: 0
+; CHECK-NEXT: 754: Name offset = 0x22, CU vector offset = 0x8
+; CHECK-NEXT: String name: int, CU vector index: 1
+; CHECK-NEXT: 956: Name offset = 0x26, CU vector offset = 0x14
+; CHECK-NEXT: String name: main2, CU vector index: 2
+
+; CHECK: Constant pool offset = 0x2060, has 3 CU vectors:
+; CHECK-NEXT: 0(0x0): 0x30000000
+; CHECK-NEXT: 1(0x8): 0x90000000 0x90000001
+; CHECK-NEXT: 2(0x14): 0x30000001
clEnumValN(DIDT_StrOffsetsDwo, "str_offsets.dwo",
".debug_str_offsets.dwo"),
clEnumValN(DIDT_CUIndex, "cu_index", ".debug_cu_index"),
+ clEnumValN(DIDT_GdbIndex, "gdb_index", ".gdb_index"),
clEnumValN(DIDT_TUIndex, "tu_index", ".debug_tu_index"), clEnumValEnd));
static void error(StringRef Filename, std::error_code EC) {
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