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-rw-r--r--ELF/InputSection.cpp201
1 files changed, 86 insertions, 115 deletions
diff --git a/ELF/InputSection.cpp b/ELF/InputSection.cpp
index 02cad56ca5088..93baefadce6e8 100644
--- a/ELF/InputSection.cpp
+++ b/ELF/InputSection.cpp
@@ -24,7 +24,6 @@
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/Endian.h"
-#include "llvm/Support/Path.h"
#include "llvm/Support/Threading.h"
#include "llvm/Support/xxhash.h"
#include <mutex>
@@ -73,11 +72,11 @@ DenseMap<SectionBase *, int> elf::buildSectionOrder() {
}
template <class ELFT>
-static ArrayRef<uint8_t> getSectionContents(ObjFile<ELFT> *File,
- const typename ELFT::Shdr *Hdr) {
- if (!File || Hdr->sh_type == SHT_NOBITS)
- return makeArrayRef<uint8_t>(nullptr, Hdr->sh_size);
- return check(File->getObj().getSectionContents(Hdr));
+static ArrayRef<uint8_t> getSectionContents(ObjFile<ELFT> &File,
+ const typename ELFT::Shdr &Hdr) {
+ if (Hdr.sh_type == SHT_NOBITS)
+ return makeArrayRef<uint8_t>(nullptr, Hdr.sh_size);
+ return check(File.getObj().getSectionContents(&Hdr));
}
InputSectionBase::InputSectionBase(InputFile *File, uint64_t Flags,
@@ -88,6 +87,12 @@ InputSectionBase::InputSectionBase(InputFile *File, uint64_t Flags,
: SectionBase(SectionKind, Name, Flags, Entsize, Alignment, Type, Info,
Link),
File(File), Data(Data) {
+ // In order to reduce memory allocation, we assume that mergeable
+ // sections are smaller than 4 GiB, which is not an unreasonable
+ // assumption as of 2017.
+ if (SectionKind == SectionBase::Merge && Data.size() > UINT32_MAX)
+ error(toString(this) + ": section too large");
+
NumRelocations = 0;
AreRelocsRela = false;
@@ -128,18 +133,18 @@ static uint64_t getType(uint64_t Type, StringRef Name) {
}
template <class ELFT>
-InputSectionBase::InputSectionBase(ObjFile<ELFT> *File,
- const typename ELFT::Shdr *Hdr,
+InputSectionBase::InputSectionBase(ObjFile<ELFT> &File,
+ const typename ELFT::Shdr &Hdr,
StringRef Name, Kind SectionKind)
- : InputSectionBase(File, getFlags(Hdr->sh_flags),
- getType(Hdr->sh_type, Name), Hdr->sh_entsize,
- Hdr->sh_link, Hdr->sh_info, Hdr->sh_addralign,
+ : InputSectionBase(&File, getFlags(Hdr.sh_flags),
+ getType(Hdr.sh_type, Name), Hdr.sh_entsize, Hdr.sh_link,
+ Hdr.sh_info, Hdr.sh_addralign,
getSectionContents(File, Hdr), Name, SectionKind) {
// We reject object files having insanely large alignments even though
// they are allowed by the spec. I think 4GB is a reasonable limitation.
// We might want to relax this in the future.
- if (Hdr->sh_addralign > UINT32_MAX)
- fatal(toString(File) + ": section sh_addralign is too large");
+ if (Hdr.sh_addralign > UINT32_MAX)
+ fatal(toString(&File) + ": section sh_addralign is too large");
}
size_t InputSectionBase::getSize() const {
@@ -211,8 +216,8 @@ void InputSectionBase::maybeUncompress() {
fatal(toString(this) +
": decompress failed: " + llvm::toString(std::move(E)));
- this->Data = makeArrayRef((uint8_t *)UncompressBuf.get(), Size);
- this->Flags &= ~(uint64_t)SHF_COMPRESSED;
+ Data = makeArrayRef((uint8_t *)UncompressBuf.get(), Size);
+ Flags &= ~(uint64_t)SHF_COMPRESSED;
}
InputSection *InputSectionBase::getLinkOrderDep() const {
@@ -257,40 +262,17 @@ std::string InputSectionBase::getLocation(uint64_t Offset) {
return (SrcFile + ":(" + Name + "+0x" + utohexstr(Offset) + ")").str();
}
-// Concatenates arguments to construct a string representing an error location.
-static std::string createFileLineMsg(StringRef Path, unsigned Line) {
- std::string Filename = path::filename(Path);
- std::string Lineno = ":" + std::to_string(Line);
- if (Filename == Path)
- return Filename + Lineno;
- return Filename + Lineno + " (" + Path.str() + Lineno + ")";
-}
-
// This function is intended to be used for constructing an error message.
// The returned message looks like this:
//
// foo.c:42 (/home/alice/possibly/very/long/path/foo.c:42)
//
// Returns an empty string if there's no way to get line info.
-template <class ELFT>
std::string InputSectionBase::getSrcMsg(const Symbol &Sym, uint64_t Offset) {
// Synthetic sections don't have input files.
- ObjFile<ELFT> *File = getFile<ELFT>();
if (!File)
return "";
-
- // In DWARF, functions and variables are stored to different places.
- // First, lookup a function for a given offset.
- if (Optional<DILineInfo> Info = File->getDILineInfo(this, Offset))
- return createFileLineMsg(Info->FileName, Info->Line);
-
- // If it failed, lookup again as a variable.
- if (Optional<std::pair<std::string, unsigned>> FileLine =
- File->getVariableLoc(Sym.getName()))
- return createFileLineMsg(FileLine->first, FileLine->second);
-
- // File->SourceFile contains STT_FILE symbol, and that is a last resort.
- return File->SourceFile;
+ return File->getSrcMsg(Sym, *this, Offset);
}
// Returns a filename string along with an optional section name. This
@@ -323,16 +305,17 @@ std::string InputSectionBase::getObjMsg(uint64_t Off) {
.str();
}
-InputSection InputSection::Discarded(0, 0, 0, ArrayRef<uint8_t>(), "");
+InputSection InputSection::Discarded(nullptr, 0, 0, 0, ArrayRef<uint8_t>(), "");
-InputSection::InputSection(uint64_t Flags, uint32_t Type, uint32_t Alignment,
- ArrayRef<uint8_t> Data, StringRef Name, Kind K)
- : InputSectionBase(nullptr, Flags, Type,
+InputSection::InputSection(InputFile *F, uint64_t Flags, uint32_t Type,
+ uint32_t Alignment, ArrayRef<uint8_t> Data,
+ StringRef Name, Kind K)
+ : InputSectionBase(F, Flags, Type,
/*Entsize*/ 0, /*Link*/ 0, /*Info*/ 0, Alignment, Data,
Name, K) {}
template <class ELFT>
-InputSection::InputSection(ObjFile<ELFT> *F, const typename ELFT::Shdr *Header,
+InputSection::InputSection(ObjFile<ELFT> &F, const typename ELFT::Shdr &Header,
StringRef Name)
: InputSectionBase(F, Header, Name, InputSectionBase::Regular) {}
@@ -357,15 +340,15 @@ template <class ELFT> void InputSection::copyShtGroup(uint8_t *Buf) {
// Adjust section numbers because section numbers in an input object
// files are different in the output.
- ArrayRef<InputSectionBase *> Sections = this->File->getSections();
+ ArrayRef<InputSectionBase *> Sections = File->getSections();
for (uint32_t Idx : From.slice(1))
*To++ = Sections[Idx]->getOutputSection()->SectionIndex;
}
InputSectionBase *InputSection::getRelocatedSection() {
- assert(this->Type == SHT_RELA || this->Type == SHT_REL);
- ArrayRef<InputSectionBase *> Sections = this->File->getSections();
- return Sections[this->Info];
+ assert(Type == SHT_RELA || Type == SHT_REL);
+ ArrayRef<InputSectionBase *> Sections = File->getSections();
+ return Sections[Info];
}
// This is used for -r and --emit-relocs. We can't use memcpy to copy
@@ -377,7 +360,7 @@ void InputSection::copyRelocations(uint8_t *Buf, ArrayRef<RelTy> Rels) {
for (const RelTy &Rel : Rels) {
RelType Type = Rel.getType(Config->IsMips64EL);
- Symbol &Sym = this->getFile<ELFT>()->getRelocTargetSym(Rel);
+ Symbol &Sym = getFile<ELFT>()->getRelocTargetSym(Rel);
auto *P = reinterpret_cast<typename ELFT::Rela *>(Buf);
Buf += sizeof(RelTy);
@@ -679,7 +662,7 @@ void InputSection::relocateNonAlloc(uint8_t *Buf, ArrayRef<RelTy> Rels) {
if (!RelTy::IsRela)
Addend += Target->getImplicitAddend(BufLoc, Type);
- Symbol &Sym = this->getFile<ELFT>()->getRelocTargetSym(Rel);
+ Symbol &Sym = getFile<ELFT>()->getRelocTargetSym(Rel);
RelExpr Expr = Target->getRelExpr(Type, Sym, BufLoc);
if (Expr == R_NONE)
continue;
@@ -691,7 +674,7 @@ void InputSection::relocateNonAlloc(uint8_t *Buf, ArrayRef<RelTy> Rels) {
if (Config->EMachine == EM_386 && Type == R_386_GOTPC)
continue;
- error(this->getLocation<ELFT>(Offset) + ": has non-ABS relocation " +
+ error(getLocation<ELFT>(Offset) + ": has non-ABS relocation " +
toString(Type) + " against symbol '" + toString(Sym) + "'");
return;
}
@@ -765,7 +748,7 @@ void InputSectionBase::relocateAlloc(uint8_t *Buf, uint8_t *BufEnd) {
}
template <class ELFT> void InputSection::writeTo(uint8_t *Buf) {
- if (this->Type == SHT_NOBITS)
+ if (Type == SHT_NOBITS)
return;
if (auto *S = dyn_cast<SyntheticSection>(this)) {
@@ -775,19 +758,17 @@ template <class ELFT> void InputSection::writeTo(uint8_t *Buf) {
// If -r or --emit-relocs is given, then an InputSection
// may be a relocation section.
- if (this->Type == SHT_RELA) {
- copyRelocations<ELFT>(Buf + OutSecOff,
- this->template getDataAs<typename ELFT::Rela>());
+ if (Type == SHT_RELA) {
+ copyRelocations<ELFT>(Buf + OutSecOff, getDataAs<typename ELFT::Rela>());
return;
}
- if (this->Type == SHT_REL) {
- copyRelocations<ELFT>(Buf + OutSecOff,
- this->template getDataAs<typename ELFT::Rel>());
+ if (Type == SHT_REL) {
+ copyRelocations<ELFT>(Buf + OutSecOff, getDataAs<typename ELFT::Rel>());
return;
}
// If -r is given, we may have a SHT_GROUP section.
- if (this->Type == SHT_GROUP) {
+ if (Type == SHT_GROUP) {
copyShtGroup<ELFT>(Buf + OutSecOff);
return;
}
@@ -796,18 +777,18 @@ template <class ELFT> void InputSection::writeTo(uint8_t *Buf) {
// and then apply relocations.
memcpy(Buf + OutSecOff, Data.data(), Data.size());
uint8_t *BufEnd = Buf + OutSecOff + Data.size();
- this->relocate<ELFT>(Buf, BufEnd);
+ relocate<ELFT>(Buf, BufEnd);
}
void InputSection::replace(InputSection *Other) {
- this->Alignment = std::max(this->Alignment, Other->Alignment);
- Other->Repl = this->Repl;
+ Alignment = std::max(Alignment, Other->Alignment);
+ Other->Repl = Repl;
Other->Live = false;
}
template <class ELFT>
-EhInputSection::EhInputSection(ObjFile<ELFT> *F,
- const typename ELFT::Shdr *Header,
+EhInputSection::EhInputSection(ObjFile<ELFT> &F,
+ const typename ELFT::Shdr &Header,
StringRef Name)
: InputSectionBase(F, Header, Name, InputSectionBase::EHFrame) {}
@@ -838,22 +819,21 @@ static unsigned getReloc(IntTy Begin, IntTy Size, const ArrayRef<RelTy> &Rels,
// This function splits an input section into records and returns them.
template <class ELFT> void EhInputSection::split() {
// Early exit if already split.
- if (!this->Pieces.empty())
+ if (!Pieces.empty())
return;
- if (this->AreRelocsRela)
- split<ELFT>(this->relas<ELFT>());
+ if (AreRelocsRela)
+ split<ELFT>(relas<ELFT>());
else
- split<ELFT>(this->rels<ELFT>());
+ split<ELFT>(rels<ELFT>());
}
template <class ELFT, class RelTy>
void EhInputSection::split(ArrayRef<RelTy> Rels) {
- ArrayRef<uint8_t> Data = this->Data;
unsigned RelI = 0;
for (size_t Off = 0, End = Data.size(); Off != End;) {
size_t Size = readEhRecordSize(this, Off);
- this->Pieces.emplace_back(Off, this, Size, getReloc(Off, Size, Rels, RelI));
+ Pieces.emplace_back(Off, this, Size, getReloc(Off, Size, Rels, RelI));
// The empty record is the end marker.
if (Size == 4)
break;
@@ -882,7 +862,7 @@ SyntheticSection *MergeInputSection::getParent() const {
// null-terminated strings.
void MergeInputSection::splitStrings(ArrayRef<uint8_t> Data, size_t EntSize) {
size_t Off = 0;
- bool IsAlloc = this->Flags & SHF_ALLOC;
+ bool IsAlloc = Flags & SHF_ALLOC;
StringRef S = toStringRef(Data);
while (!S.empty()) {
@@ -903,7 +883,7 @@ void MergeInputSection::splitNonStrings(ArrayRef<uint8_t> Data,
size_t EntSize) {
size_t Size = Data.size();
assert((Size % EntSize) == 0);
- bool IsAlloc = this->Flags & SHF_ALLOC;
+ bool IsAlloc = Flags & SHF_ALLOC;
for (size_t I = 0; I != Size; I += EntSize)
Pieces.emplace_back(I, xxHash64(toStringRef(Data.slice(I, EntSize))),
@@ -911,16 +891,16 @@ void MergeInputSection::splitNonStrings(ArrayRef<uint8_t> Data,
}
template <class ELFT>
-MergeInputSection::MergeInputSection(ObjFile<ELFT> *F,
- const typename ELFT::Shdr *Header,
+MergeInputSection::MergeInputSection(ObjFile<ELFT> &F,
+ const typename ELFT::Shdr &Header,
StringRef Name)
- : InputSectionBase(F, Header, Name, InputSectionBase::Merge) {
- // In order to reduce memory allocation, we assume that mergeable
- // sections are smaller than 4 GiB, which is not an unreasonable
- // assumption as of 2017.
- if (Data.size() > UINT32_MAX)
- error(toString(this) + ": section too large");
-}
+ : InputSectionBase(F, Header, Name, InputSectionBase::Merge) {}
+
+MergeInputSection::MergeInputSection(uint64_t Flags, uint32_t Type,
+ uint64_t Entsize, ArrayRef<uint8_t> Data,
+ StringRef Name)
+ : InputSectionBase(nullptr, Flags, Type, Entsize, /*Link*/ 0, /*Info*/ 0,
+ /*Alignment*/ Entsize, Data, Name, SectionBase::Merge) {}
// This function is called after we obtain a complete list of input sections
// that need to be linked. This is responsible to split section contents
@@ -931,14 +911,14 @@ MergeInputSection::MergeInputSection(ObjFile<ELFT> *F,
void MergeInputSection::splitIntoPieces() {
assert(Pieces.empty());
- if (this->Flags & SHF_STRINGS)
+ if (Flags & SHF_STRINGS)
splitStrings(Data, Entsize);
else
splitNonStrings(Data, Entsize);
- if (Config->GcSections && (this->Flags & SHF_ALLOC))
+ if (Config->GcSections && (Flags & SHF_ALLOC))
for (uint64_t Off : LiveOffsets)
- this->getSectionPiece(Off)->Live = true;
+ getSectionPiece(Off)->Live = true;
}
// Do binary search to get a section piece at a given input offset.
@@ -993,7 +973,7 @@ uint64_t MergeInputSection::getOffset(uint64_t Offset) const {
// If Offset is not at beginning of a section piece, it is not in the map.
// In that case we need to search from the original section piece vector.
- const SectionPiece &Piece = *this->getSectionPiece(Offset);
+ const SectionPiece &Piece = *getSectionPiece(Offset);
if (!Piece.Live)
return 0;
@@ -1001,13 +981,13 @@ uint64_t MergeInputSection::getOffset(uint64_t Offset) const {
return Piece.OutputOff + Addend;
}
-template InputSection::InputSection(ObjFile<ELF32LE> *, const ELF32LE::Shdr *,
+template InputSection::InputSection(ObjFile<ELF32LE> &, const ELF32LE::Shdr &,
StringRef);
-template InputSection::InputSection(ObjFile<ELF32BE> *, const ELF32BE::Shdr *,
+template InputSection::InputSection(ObjFile<ELF32BE> &, const ELF32BE::Shdr &,
StringRef);
-template InputSection::InputSection(ObjFile<ELF64LE> *, const ELF64LE::Shdr *,
+template InputSection::InputSection(ObjFile<ELF64LE> &, const ELF64LE::Shdr &,
StringRef);
-template InputSection::InputSection(ObjFile<ELF64BE> *, const ELF64BE::Shdr *,
+template InputSection::InputSection(ObjFile<ELF64BE> &, const ELF64BE::Shdr &,
StringRef);
template std::string InputSectionBase::getLocation<ELF32LE>(uint64_t);
@@ -1015,37 +995,28 @@ template std::string InputSectionBase::getLocation<ELF32BE>(uint64_t);
template std::string InputSectionBase::getLocation<ELF64LE>(uint64_t);
template std::string InputSectionBase::getLocation<ELF64BE>(uint64_t);
-template std::string InputSectionBase::getSrcMsg<ELF32LE>(const Symbol &,
- uint64_t);
-template std::string InputSectionBase::getSrcMsg<ELF32BE>(const Symbol &,
- uint64_t);
-template std::string InputSectionBase::getSrcMsg<ELF64LE>(const Symbol &,
- uint64_t);
-template std::string InputSectionBase::getSrcMsg<ELF64BE>(const Symbol &,
- uint64_t);
-
template void InputSection::writeTo<ELF32LE>(uint8_t *);
template void InputSection::writeTo<ELF32BE>(uint8_t *);
template void InputSection::writeTo<ELF64LE>(uint8_t *);
template void InputSection::writeTo<ELF64BE>(uint8_t *);
-template MergeInputSection::MergeInputSection(ObjFile<ELF32LE> *,
- const ELF32LE::Shdr *, StringRef);
-template MergeInputSection::MergeInputSection(ObjFile<ELF32BE> *,
- const ELF32BE::Shdr *, StringRef);
-template MergeInputSection::MergeInputSection(ObjFile<ELF64LE> *,
- const ELF64LE::Shdr *, StringRef);
-template MergeInputSection::MergeInputSection(ObjFile<ELF64BE> *,
- const ELF64BE::Shdr *, StringRef);
-
-template EhInputSection::EhInputSection(ObjFile<ELF32LE> *,
- const ELF32LE::Shdr *, StringRef);
-template EhInputSection::EhInputSection(ObjFile<ELF32BE> *,
- const ELF32BE::Shdr *, StringRef);
-template EhInputSection::EhInputSection(ObjFile<ELF64LE> *,
- const ELF64LE::Shdr *, StringRef);
-template EhInputSection::EhInputSection(ObjFile<ELF64BE> *,
- const ELF64BE::Shdr *, StringRef);
+template MergeInputSection::MergeInputSection(ObjFile<ELF32LE> &,
+ const ELF32LE::Shdr &, StringRef);
+template MergeInputSection::MergeInputSection(ObjFile<ELF32BE> &,
+ const ELF32BE::Shdr &, StringRef);
+template MergeInputSection::MergeInputSection(ObjFile<ELF64LE> &,
+ const ELF64LE::Shdr &, StringRef);
+template MergeInputSection::MergeInputSection(ObjFile<ELF64BE> &,
+ const ELF64BE::Shdr &, StringRef);
+
+template EhInputSection::EhInputSection(ObjFile<ELF32LE> &,
+ const ELF32LE::Shdr &, StringRef);
+template EhInputSection::EhInputSection(ObjFile<ELF32BE> &,
+ const ELF32BE::Shdr &, StringRef);
+template EhInputSection::EhInputSection(ObjFile<ELF64LE> &,
+ const ELF64LE::Shdr &, StringRef);
+template EhInputSection::EhInputSection(ObjFile<ELF64BE> &,
+ const ELF64BE::Shdr &, StringRef);
template void EhInputSection::split<ELF32LE>();
template void EhInputSection::split<ELF32BE>();
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-22 10:34:39 +0000