bool SymbolTable::addByName(const Atom &newAtom) {
StringRef name = newAtom.name();
assert(!name.empty());
const Atom *existing = findByName(name);
if (existing == nullptr) {
// Name is not in symbol table yet, add it associate with this atom.
_nameTable[name] = &newAtom;
return true;
}
// Do nothing if the same object is added more than once.
if (existing == &newAtom)
return false;
// Name is already in symbol table and associated with another atom.
bool useNew = true;
switch (collide(existing->definition(), newAtom.definition())) {
case NCR_First:
useNew = false;
break;
case NCR_Second:
useNew = true;
break;
case NCR_DupDef:
assert(existing->definition() == Atom::definitionRegular);
assert(newAtom.definition() == Atom::definitionRegular);
switch (mergeSelect(((DefinedAtom*)existing)->merge(),
((DefinedAtom*)&newAtom)->merge())) {
case MCR_First:
useNew = false;
break;
case MCR_Second:
useNew = true;
break;
case MCR_Largest: {
uint64_t existingSize = sectionSize((DefinedAtom*)existing);
uint64_t newSize = sectionSize((DefinedAtom*)&newAtom);
useNew = (newSize >= existingSize);
break;
}
case MCR_SameSize: {
uint64_t existingSize = sectionSize((DefinedAtom*)existing);
uint64_t newSize = sectionSize((DefinedAtom*)&newAtom);
if (existingSize == newSize) {
useNew = true;
break;
}
llvm::errs() << "Size mismatch: "
<< existing->name() << " (" << existingSize << ") "
<< newAtom.name() << " (" << newSize << ")\n";
// fallthrough
}
case MCR_Error:
if (!_context.getAllowDuplicates()) {
llvm::errs() << "Duplicate symbols: "
<< existing->name()
<< ":"
<< existing->file().path()
<< " and "
<< newAtom.name()
<< ":"
<< newAtom.file().path()
<< "\n";
llvm::report_fatal_error("duplicate symbol error");
}
useNew = false;
break;
}
break;
case NCR_DupUndef: {
const UndefinedAtom* existingUndef = cast<UndefinedAtom>(existing);
const UndefinedAtom* newUndef = cast<UndefinedAtom>(&newAtom);
bool sameCanBeNull = (existingUndef->canBeNull() == newUndef->canBeNull());
if (!sameCanBeNull &&
_context.warnIfCoalesableAtomsHaveDifferentCanBeNull()) {
llvm::errs() << "lld warning: undefined symbol "
<< existingUndef->name()
<< " has different weakness in "
<< existingUndef->file().path()
<< " and in " << newUndef->file().path() << "\n";
}
const UndefinedAtom *existingFallback = existingUndef->fallback();
const UndefinedAtom *newFallback = newUndef->fallback();
bool hasDifferentFallback =
(existingFallback && newFallback &&
existingFallback->name() != newFallback->name());
if (hasDifferentFallback) {
llvm::errs() << "lld warning: undefined symbol "
<< existingUndef->name() << " has different fallback: "
<< existingFallback->name() << " in "
<< existingUndef->file().path() << " and "
<< newFallback->name() << " in "
<< newUndef->file().path() << "\n";
}
bool hasNewFallback = newUndef->fallback();
if (sameCanBeNull)
useNew = hasNewFallback;
else
useNew = (newUndef->canBeNull() < existingUndef->canBeNull());
break;
}
case NCR_DupShLib: {
const SharedLibraryAtom *curShLib = cast<SharedLibraryAtom>(existing);
const SharedLibraryAtom *newShLib = cast<SharedLibraryAtom>(&newAtom);
bool sameNullness =
(curShLib->canBeNullAtRuntime() == newShLib->canBeNullAtRuntime());
bool sameName = curShLib->loadName().equals(newShLib->loadName());
if (sameName && !sameNullness &&
_context.warnIfCoalesableAtomsHaveDifferentCanBeNull()) {
// FIXME: need diagonstics interface for writing warning messages
llvm::errs() << "lld warning: shared library symbol "
<< curShLib->name() << " has different weakness in "
<< curShLib->file().path() << " and in "
<< newShLib->file().path();
}
if (!sameName && _context.warnIfCoalesableAtomsHaveDifferentLoadName()) {
// FIXME: need diagonstics interface for writing warning messages
llvm::errs() << "lld warning: shared library symbol "
<< curShLib->name() << " has different load path in "
<< curShLib->file().path() << " and in "
<< newShLib->file().path();
}
useNew = false;
break;
}
case NCR_Error:
llvm::errs() << "SymbolTable: error while merging " << name << "\n";
llvm::report_fatal_error("duplicate symbol error");
break;
}
if (useNew) {
// Update name table to use new atom.
_nameTable[name] = &newAtom;
// Add existing atom to replacement table.
_replacedAtoms[existing] = &newAtom;
} else {
// New atom is not being used. Add it to replacement table.
_replacedAtoms[&newAtom] = existing;
}
return false;
}
void SymbolTable::addByName(const Atom & newAtom) {
StringRef name = newAtom.name();
const Atom *existing = this->findByName(name);
if (existing == nullptr) {
// Name is not in symbol table yet, add it associate with this atom.
_nameTable[name] = &newAtom;
}
else {
// Name is already in symbol table and associated with another atom.
bool useNew = true;
switch (collide(existing->definition(), newAtom.definition())) {
case NCR_First:
useNew = false;
break;
case NCR_Second:
useNew = true;
break;
case NCR_DupDef:
assert(existing->definition() == Atom::definitionRegular);
assert(newAtom.definition() == Atom::definitionRegular);
switch ( mergeSelect(((DefinedAtom*)existing)->merge(),
((DefinedAtom*)(&newAtom))->merge()) ) {
case MCR_First:
useNew = false;
break;
case MCR_Second:
useNew = true;
break;
case MCR_Largest:
useNew = true;
break;
case MCR_Error:
llvm::errs() << "Duplicate symbols: "
<< existing->name()
<< ":"
<< existing->file().path()
<< " and "
<< newAtom.name()
<< ":"
<< newAtom.file().path()
<< "\n";
llvm::report_fatal_error("duplicate symbol error");
break;
}
break;
case NCR_DupUndef: {
const UndefinedAtom* existingUndef =
dyn_cast<UndefinedAtom>(existing);
const UndefinedAtom* newUndef =
dyn_cast<UndefinedAtom>(&newAtom);
assert(existingUndef != nullptr);
assert(newUndef != nullptr);
if ( existingUndef->canBeNull() == newUndef->canBeNull() ) {
useNew = false;
}
else {
if ( _options.warnIfCoalesableAtomsHaveDifferentCanBeNull() ) {
// FIXME: need diagonstics interface for writing warning messages
llvm::errs() << "lld warning: undefined symbol "
<< existingUndef->name()
<< " has different weakness in "
<< existingUndef->file().path()
<< " and in "
<< newUndef->file().path();
}
useNew = (newUndef->canBeNull() < existingUndef->canBeNull());
}
}
break;
case NCR_DupShLib: {
const SharedLibraryAtom* curShLib =
dyn_cast<SharedLibraryAtom>(existing);
const SharedLibraryAtom* newShLib =
dyn_cast<SharedLibraryAtom>(&newAtom);
assert(curShLib != nullptr);
assert(newShLib != nullptr);
bool sameNullness = (curShLib->canBeNullAtRuntime()
== newShLib->canBeNullAtRuntime());
bool sameName = curShLib->loadName().equals(newShLib->loadName());
if ( !sameName ) {
useNew = false;
if ( _options.warnIfCoalesableAtomsHaveDifferentLoadName() ) {
// FIXME: need diagonstics interface for writing warning messages
llvm::errs() << "lld warning: shared library symbol "
<< curShLib->name()
<< " has different load path in "
<< curShLib->file().path()
<< " and in "
<< newShLib->file().path();
}
}
else if ( ! sameNullness ) {
useNew = false;
if ( _options.warnIfCoalesableAtomsHaveDifferentCanBeNull() ) {
// FIXME: need diagonstics interface for writing warning messages
llvm::errs() << "lld warning: shared library symbol "
<< curShLib->name()
<< " has different weakness in "
<< curShLib->file().path()
<< " and in "
<< newShLib->file().path();
}
}
else {
// Both shlib atoms are identical and can be coalesced.
useNew = false;
}
}
break;
default:
llvm::report_fatal_error("SymbolTable::addByName(): unhandled switch clause");
}
if ( useNew ) {
// Update name table to use new atom.
_nameTable[name] = &newAtom;
// Add existing atom to replacement table.
_replacedAtoms[existing] = &newAtom;
}
else {
// New atom is not being used. Add it to replacement table.
_replacedAtoms[&newAtom] = existing;
}
}
}
bool SymbolTable::addByName(const Atom &newAtom) {
StringRef name = newAtom.name();
assert(!name.empty());
const Atom *existing = findByName(name);
if (existing == nullptr) {
// Name is not in symbol table yet, add it associate with this atom.
_nameTable[name] = &newAtom;
return true;
}
// Do nothing if the same object is added more than once.
if (existing == &newAtom)
return false;
// Name is already in symbol table and associated with another atom.
bool useNew = true;
switch (collide(existing->definition(), newAtom.definition())) {
case NCR_First:
useNew = false;
break;
case NCR_Second:
useNew = true;
break;
case NCR_DupDef: {
const auto *existingDef = cast<DefinedAtom>(existing);
const auto *newDef = cast<DefinedAtom>(&newAtom);
switch (mergeSelect(existingDef->merge(), newDef->merge())) {
case MCR_First:
useNew = false;
break;
case MCR_Second:
useNew = true;
break;
case MCR_Largest: {
uint64_t existingSize = existingDef->sectionSize();
uint64_t newSize = newDef->sectionSize();
useNew = (newSize >= existingSize);
break;
}
case MCR_SameSize: {
uint64_t existingSize = existingDef->sectionSize();
uint64_t newSize = newDef->sectionSize();
if (existingSize == newSize) {
useNew = true;
break;
}
llvm::errs() << "Size mismatch: "
<< existing->name() << " (" << existingSize << ") "
<< newAtom.name() << " (" << newSize << ")\n";
LLVM_FALLTHROUGH;
}
case MCR_Error:
llvm::errs() << "Duplicate symbols: "
<< existing->name()
<< ":"
<< existing->file().path()
<< " and "
<< newAtom.name()
<< ":"
<< newAtom.file().path()
<< "\n";
llvm::report_fatal_error("duplicate symbol error");
break;
}
break;
}
case NCR_DupUndef: {
const UndefinedAtom* existingUndef = cast<UndefinedAtom>(existing);
const UndefinedAtom* newUndef = cast<UndefinedAtom>(&newAtom);
bool sameCanBeNull = (existingUndef->canBeNull() == newUndef->canBeNull());
if (sameCanBeNull)
useNew = false;
else
useNew = (newUndef->canBeNull() < existingUndef->canBeNull());
break;
}
case NCR_DupShLib: {
useNew = false;
break;
}
case NCR_Error:
llvm::errs() << "SymbolTable: error while merging " << name << "\n";
llvm::report_fatal_error("duplicate symbol error");
break;
}
if (useNew) {
// Update name table to use new atom.
_nameTable[name] = &newAtom;
// Add existing atom to replacement table.
_replacedAtoms[existing] = &newAtom;
} else {
// New atom is not being used. Add it to replacement table.
_replacedAtoms[&newAtom] = existing;
}
return false;
}