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[ELF] Move addDependentLibrary/handleSectionGroup. NFC 

To reduce diff for my upcoming parallel input section initialization patch.
This commit is contained in:
Fangrui Song 2022-07-29 17:07:09 -07:00
parent c01e622120
commit d6d4f631ac
1 changed files with 59 additions and 59 deletions
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118
lld/ELF/InputFiles.cpp
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@ -258,6 +258,65 @@ StringRef InputFile::getNameForScript() const {
return nameForScriptCache;
}
// An ELF object file may contain a `.deplibs` section. If it exists, the
// section contains a list of library specifiers such as `m` for libm. This
// function resolves a given name by finding the first matching library checking
// the various ways that a library can be specified to LLD. This ELF extension
// is a form of autolinking and is called `dependent libraries`. It is currently
// unique to LLVM and lld.
static void addDependentLibrary(StringRef specifier, const InputFile *f) {
if (!config->dependentLibraries)
return;
if (Optional<std::string> s = searchLibraryBaseName(specifier))
driver->addFile(saver().save(*s), /*withLOption=*/true);
else if (Optional<std::string> s = findFromSearchPaths(specifier))
driver->addFile(saver().save(*s), /*withLOption=*/true);
else if (fs::exists(specifier))
driver->addFile(specifier, /*withLOption=*/false);
else
error(toString(f) +
": unable to find library from dependent library specifier: " +
specifier);
}
// Record the membership of a section group so that in the garbage collection
// pass, section group members are kept or discarded as a unit.
template <class ELFT>
static void handleSectionGroup(ArrayRef<InputSectionBase *> sections,
ArrayRef<typename ELFT::Word> entries) {
bool hasAlloc = false;
for (uint32_t index : entries.slice(1)) {
if (index >= sections.size())
return;
if (InputSectionBase *s = sections[index])
if (s != &InputSection::discarded && s->flags & SHF_ALLOC)
hasAlloc = true;
}
// If any member has the SHF_ALLOC flag, the whole group is subject to garbage
// collection. See the comment in markLive(). This rule retains .debug_types
// and .rela.debug_types.
if (!hasAlloc)
return;
// Connect the members in a circular doubly-linked list via
// nextInSectionGroup.
InputSectionBase *head;
InputSectionBase *prev = nullptr;
for (uint32_t index : entries.slice(1)) {
InputSectionBase *s = sections[index];
if (!s || s == &InputSection::discarded)
continue;
if (prev)
prev->nextInSectionGroup = s;
else
head = s;
prev = s;
}
if (prev)
prev->nextInSectionGroup = head;
}
template <class ELFT> DWARFCache *ObjFile<ELFT>::getDwarf() {
llvm::call_once(initDwarf, [this]() {
dwarf = std::make_unique<DWARFCache>(std::make_unique<DWARFContext>(
@ -450,65 +509,6 @@ template <class ELFT> void ObjFile<ELFT>::initializeJustSymbols() {
sections.resize(numELFShdrs);
}
// An ELF object file may contain a `.deplibs` section. If it exists, the
// section contains a list of library specifiers such as `m` for libm. This
// function resolves a given name by finding the first matching library checking
// the various ways that a library can be specified to LLD. This ELF extension
// is a form of autolinking and is called `dependent libraries`. It is currently
// unique to LLVM and lld.
static void addDependentLibrary(StringRef specifier, const InputFile *f) {
if (!config->dependentLibraries)
return;
if (Optional<std::string> s = searchLibraryBaseName(specifier))
driver->addFile(saver().save(*s), /*withLOption=*/true);
else if (Optional<std::string> s = findFromSearchPaths(specifier))
driver->addFile(saver().save(*s), /*withLOption=*/true);
else if (fs::exists(specifier))
driver->addFile(specifier, /*withLOption=*/false);
else
error(toString(f) +
": unable to find library from dependent library specifier: " +
specifier);
}
// Record the membership of a section group so that in the garbage collection
// pass, section group members are kept or discarded as a unit.
template <class ELFT>
static void handleSectionGroup(ArrayRef<InputSectionBase *> sections,
ArrayRef<typename ELFT::Word> entries) {
bool hasAlloc = false;
for (uint32_t index : entries.slice(1)) {
if (index >= sections.size())
return;
if (InputSectionBase *s = sections[index])
if (s != &InputSection::discarded && s->flags & SHF_ALLOC)
hasAlloc = true;
}
// If any member has the SHF_ALLOC flag, the whole group is subject to garbage
// collection. See the comment in markLive(). This rule retains .debug_types
// and .rela.debug_types.
if (!hasAlloc)
return;
// Connect the members in a circular doubly-linked list via
// nextInSectionGroup.
InputSectionBase *head;
InputSectionBase *prev = nullptr;
for (uint32_t index : entries.slice(1)) {
InputSectionBase *s = sections[index];
if (!s || s == &InputSection::discarded)
continue;
if (prev)
prev->nextInSectionGroup = s;
else
head = s;
prev = s;
}
if (prev)
prev->nextInSectionGroup = head;
}
template <class ELFT>
void ObjFile<ELFT>::initializeSections(bool ignoreComdats,
const llvm::object::ELFFile<ELFT> &obj) {