[ELF] - Partial support of --gdb-index command line option (Part 1).
In this patch partial gdb_index section is created.
For costructing the .gdb_index section 6 steps should be performed (details are in
SplitDebugInfo.cpp file header), this patch do first 3:
Creates proper section header.
Fills list of compilation units.
Types CU list area is not supposed to be supported, so it is ignored and therefore
can be treated as implemented either.
Differential revision: https://reviews.llvm.org/D24706
llvm-svn: 284708
diff --git a/lld/ELF/OutputSections.h b/lld/ELF/OutputSections.h
index 662ef06..14e9dfe 100644
--- a/lld/ELF/OutputSections.h
+++ b/lld/ELF/OutputSections.h
@@ -11,6 +11,7 @@
#define LLD_ELF_OUTPUT_SECTIONS_H
#include "Config.h"
+#include "GdbIndex.h"
#include "Relocations.h"
#include "lld/Core/LLVM.h"
@@ -131,6 +132,31 @@
uintX_t LMAOffset = 0;
};
+template <class ELFT>
+class GdbIndexSection final : public OutputSectionBase<ELFT> {
+ typedef typename ELFT::uint uintX_t;
+
+ const unsigned OffsetTypeSize = 4;
+ const unsigned CuListOffset = 6 * OffsetTypeSize;
+ const unsigned CompilationUnitSize = 16;
+ const unsigned AddressEntrySize = 16 + OffsetTypeSize;
+ const unsigned SymTabEntrySize = 2 * OffsetTypeSize;
+
+public:
+ GdbIndexSection();
+ void finalize() override;
+ void writeTo(uint8_t *Buf) override;
+
+ // Pairs of [CU Offset, CU length].
+ std::vector<std::pair<uintX_t, uintX_t>> CompilationUnits;
+
+private:
+ void parseDebugSections();
+ void readDwarf(InputSection<ELFT> *I);
+
+ uint32_t CuTypesOffset;
+};
+
template <class ELFT> class GotSection final : public OutputSectionBase<ELFT> {
typedef OutputSectionBase<ELFT> Base;
typedef typename ELFT::uint uintX_t;
@@ -768,6 +794,7 @@
static DynamicSection<ELFT> *Dynamic;
static EhFrameHeader<ELFT> *EhFrameHdr;
static EhOutputSection<ELFT> *EhFrame;
+ static GdbIndexSection<ELFT> *GdbIndex;
static GnuHashTableSection<ELFT> *GnuHashTab;
static GotPltSection<ELFT> *GotPlt;
static GotSection<ELFT> *Got;
@@ -789,6 +816,7 @@
static VersionTableSection<ELFT> *VerSym;
static VersionNeedSection<ELFT> *VerNeed;
static Elf_Phdr *TlsPhdr;
+ static OutputSectionBase<ELFT> *DebugInfo;
static OutputSectionBase<ELFT> *ElfHeader;
static OutputSectionBase<ELFT> *ProgramHeaders;
@@ -837,6 +865,7 @@
template <class ELFT> DynamicSection<ELFT> *Out<ELFT>::Dynamic;
template <class ELFT> EhFrameHeader<ELFT> *Out<ELFT>::EhFrameHdr;
template <class ELFT> EhOutputSection<ELFT> *Out<ELFT>::EhFrame;
+template <class ELFT> GdbIndexSection<ELFT> *Out<ELFT>::GdbIndex;
template <class ELFT> GnuHashTableSection<ELFT> *Out<ELFT>::GnuHashTab;
template <class ELFT> GotPltSection<ELFT> *Out<ELFT>::GotPlt;
template <class ELFT> GotSection<ELFT> *Out<ELFT>::Got;
@@ -858,6 +887,7 @@
template <class ELFT> VersionTableSection<ELFT> *Out<ELFT>::VerSym;
template <class ELFT> VersionNeedSection<ELFT> *Out<ELFT>::VerNeed;
template <class ELFT> typename ELFT::Phdr *Out<ELFT>::TlsPhdr;
+template <class ELFT> OutputSectionBase<ELFT> *Out<ELFT>::DebugInfo;
template <class ELFT> OutputSectionBase<ELFT> *Out<ELFT>::ElfHeader;
template <class ELFT> OutputSectionBase<ELFT> *Out<ELFT>::ProgramHeaders;
template <class ELFT> OutputSectionBase<ELFT> *Out<ELFT>::PreinitArray;