namespace gold
{
+// Symbol methods used in this file.
+
+// Override the fields in Symbol.
+
+template<int size, bool big_endian>
+void
+Symbol::override_base(const elfcpp::Sym<size, big_endian>& sym,
+ Object* object, const char* version)
+{
+ gold_assert(this->source_ == FROM_OBJECT);
+ this->u_.from_object.object = object;
+ if (version != NULL && this->version() != version)
+ {
+ gold_assert(this->version() == NULL);
+ this->version_ = version;
+ }
+ // FIXME: Handle SHN_XINDEX.
+ this->u_.from_object.shndx = sym.get_st_shndx();
+ this->type_ = sym.get_st_type();
+ this->binding_ = sym.get_st_bind();
+ this->visibility_ = sym.get_st_visibility();
+ this->nonvis_ = sym.get_st_nonvis();
+}
+
+// Override the fields in Sized_symbol.
+
+template<int size>
+template<bool big_endian>
+void
+Sized_symbol<size>::override(const elfcpp::Sym<size, big_endian>& sym,
+ Object* object, const char* version)
+{
+ this->override_base(sym, object, version);
+ this->value_ = sym.get_st_value();
+ this->symsize_ = sym.get_st_size();
+}
+
// Resolve a symbol. This is called the second and subsequent times
// we see a symbol. TO is the pre-existing symbol. SYM is the new
-// symbol, seen in OBJECT.
+// symbol, seen in OBJECT. VERSION of the version of SYM.
template<int size, bool big_endian>
void
-Symbol_table::resolve(Symbol* to,
+Symbol_table::resolve(Sized_symbol<size>* to,
const elfcpp::Sym<size, big_endian>& sym,
- Object* object)
+ Object* object, const char* version)
{
if (object->target()->has_resolve())
{
- object->sized_target<size, big_endian>()->resolve(to, sym, object);
+ Sized_target<size, big_endian>* sized_target;
+ sized_target = object->sized_target
+ SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
+ SELECT_SIZE_ENDIAN_ONLY(size, big_endian));
+ sized_target->resolve(to, sym, object, version);
return;
}
case elfcpp::STB_LOCAL:
// We should only see externally visible symbols in the symbol
// table.
- abort();
+ gold_unreachable();
default:
// Any target which wants to handle STB_LOOS, etc., needs to
// define a resolve method.
- abort();
+ gold_unreachable();
}
- if (to->object() != NULL && to->object()->is_dynamic())
+ if (to->source() == Symbol::FROM_OBJECT
+ && to->object()->is_dynamic())
tobits |= (1 << 1);
- switch (to->shnum())
+ switch (to->shndx())
{
case elfcpp::SHN_UNDEF:
tobits |= (1 << 2);
break;
default:
+ if (to->type() == elfcpp::STT_COMMON)
+ tobits |= (2 << 2);
break;
}
gold_exit(false);
}
- if (object->is_dynamic())
- frombits |= (1 << 1);
+ if (!object->is_dynamic())
+ {
+ // Record that we've seen this symbol in a regular object.
+ to->set_in_reg();
+ }
+ else
+ {
+ frombits |= (1 << 1);
+
+ // Record that we've seen this symbol in a dynamic object.
+ to->set_in_dyn();
+ }
switch (sym.get_st_shndx())
{
break;
default:
+ if (sym.get_st_type() == elfcpp::STT_COMMON)
+ frombits |= (2 << 2);
break;
}
+ if ((tobits & (1 << 1)) != (frombits & (1 << 1)))
+ {
+ // This symbol is seen in both a dynamic object and a regular
+ // object. That means that we need the symbol to go into the
+ // dynamic symbol table, so that the dynamic linker can use the
+ // regular symbol to override or define the dynamic symbol.
+ to->set_needs_dynsym_entry();
+ }
+
+ // FIXME: Warn if either but not both of TO and SYM are STT_TLS.
+
// We use a giant switch table for symbol resolution. This code is
// unwieldy, but: 1) it is efficient; 2) we definitely handle all
// cases; 3) it is easy to change the handling of a particular case.
return;
case WEAK_DEF * 16 + DEF:
- // In the original SVR4 linker, a weak definition followed by a
- // regular definition was treated as a multiple definition
- // error. In the Solaris linker and the GNU linker, a weak
- // definition followed by a regular definition causes the
- // regular definition to be ignored. We are currently
- // compatible with the GNU linker. In the future we should add
- // a target specific option to change this. FIXME.
+ // We've seen a weak definition, and now we see a strong
+ // definition. In the original SVR4 linker, this was treated as
+ // a multiple definition error. In the Solaris linker and the
+ // GNU linker, a weak definition followed by a regular
+ // definition causes the weak definition to be overridden. We
+ // are currently compatible with the GNU linker. In the future
+ // we should add a target specific option to change this.
+ // FIXME.
+ to->override(sym, object, version);
return;
case DYN_DEF * 16 + DEF:
case DYN_WEAK_DEF * 16 + DEF:
+ // We've seen a definition in a dynamic object, and now we see a
+ // definition in a regular object. The definition in the
+ // regular object overrides the definition in the dynamic
+ // object.
+ to->override(sym, object, version);
+ return;
+
case UNDEF * 16 + DEF:
case WEAK_UNDEF * 16 + DEF:
case DYN_UNDEF * 16 + DEF:
case DYN_WEAK_UNDEF * 16 + DEF:
+ // We've seen an undefined reference, and now we see a
+ // definition. We use the definition.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + DEF:
case WEAK_COMMON * 16 + DEF:
case DYN_COMMON * 16 + DEF:
case DYN_WEAK_COMMON * 16 + DEF:
+ // We've seen a common symbol and now we see a definition. The
+ // definition overrides. FIXME: We should optionally issue, version a
+ // warning.
+ to->override(sym, object, version);
+ return;
case DEF * 16 + WEAK_DEF:
case WEAK_DEF * 16 + WEAK_DEF:
+ // We've seen a definition and now we see a weak definition. We
+ // ignore the new weak definition.
+ return;
+
case DYN_DEF * 16 + WEAK_DEF:
case DYN_WEAK_DEF * 16 + WEAK_DEF:
+ // We've seen a dynamic definition and now we see a regular weak
+ // definition. The regular weak definition overrides.
+ to->override(sym, object, version);
+ return;
+
case UNDEF * 16 + WEAK_DEF:
case WEAK_UNDEF * 16 + WEAK_DEF:
case DYN_UNDEF * 16 + WEAK_DEF:
case DYN_WEAK_UNDEF * 16 + WEAK_DEF:
+ // A weak definition of a currently undefined symbol.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + WEAK_DEF:
case WEAK_COMMON * 16 + WEAK_DEF:
+ // A weak definition does not override a common definition.
+ return;
+
case DYN_COMMON * 16 + WEAK_DEF:
case DYN_WEAK_COMMON * 16 + WEAK_DEF:
+ // A weak definition does override a definition in a dynamic
+ // object. FIXME: We should optionally issue a warning.
+ to->override(sym, object, version);
+ return;
case DEF * 16 + DYN_DEF:
case WEAK_DEF * 16 + DYN_DEF:
case DYN_DEF * 16 + DYN_DEF:
case DYN_WEAK_DEF * 16 + DYN_DEF:
+ // Ignore a dynamic definition if we already have a definition.
+ return;
+
case UNDEF * 16 + DYN_DEF:
case WEAK_UNDEF * 16 + DYN_DEF:
case DYN_UNDEF * 16 + DYN_DEF:
case DYN_WEAK_UNDEF * 16 + DYN_DEF:
+ // Use a dynamic definition if we have a reference.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + DYN_DEF:
case WEAK_COMMON * 16 + DYN_DEF:
case DYN_COMMON * 16 + DYN_DEF:
case DYN_WEAK_COMMON * 16 + DYN_DEF:
+ // Ignore a dynamic definition if we already have a common
+ // definition.
+ return;
case DEF * 16 + DYN_WEAK_DEF:
case WEAK_DEF * 16 + DYN_WEAK_DEF:
case DYN_DEF * 16 + DYN_WEAK_DEF:
case DYN_WEAK_DEF * 16 + DYN_WEAK_DEF:
+ // Ignore a weak dynamic definition if we already have a
+ // definition.
+ return;
+
case UNDEF * 16 + DYN_WEAK_DEF:
case WEAK_UNDEF * 16 + DYN_WEAK_DEF:
case DYN_UNDEF * 16 + DYN_WEAK_DEF:
case DYN_WEAK_UNDEF * 16 + DYN_WEAK_DEF:
+ // Use a weak dynamic definition if we have a reference.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + DYN_WEAK_DEF:
case WEAK_COMMON * 16 + DYN_WEAK_DEF:
case DYN_COMMON * 16 + DYN_WEAK_DEF:
case DYN_WEAK_COMMON * 16 + DYN_WEAK_DEF:
+ // Ignore a weak dynamic definition if we already have a common
+ // definition.
+ return;
case DEF * 16 + UNDEF:
case WEAK_DEF * 16 + UNDEF:
case DYN_DEF * 16 + UNDEF:
case DYN_WEAK_DEF * 16 + UNDEF:
case UNDEF * 16 + UNDEF:
+ // A new undefined reference tells us nothing.
+ return;
+
case WEAK_UNDEF * 16 + UNDEF:
case DYN_UNDEF * 16 + UNDEF:
case DYN_WEAK_UNDEF * 16 + UNDEF:
+ // A strong undef overrides a dynamic or weak undef.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + UNDEF:
case WEAK_COMMON * 16 + UNDEF:
case DYN_COMMON * 16 + UNDEF:
case DYN_WEAK_COMMON * 16 + UNDEF:
+ // A new undefined reference tells us nothing.
+ return;
case DEF * 16 + WEAK_UNDEF:
case WEAK_DEF * 16 + WEAK_UNDEF:
case WEAK_COMMON * 16 + WEAK_UNDEF:
case DYN_COMMON * 16 + WEAK_UNDEF:
case DYN_WEAK_COMMON * 16 + WEAK_UNDEF:
+ // A new weak undefined reference tells us nothing.
+ return;
case DEF * 16 + DYN_UNDEF:
case WEAK_DEF * 16 + DYN_UNDEF:
case WEAK_COMMON * 16 + DYN_UNDEF:
case DYN_COMMON * 16 + DYN_UNDEF:
case DYN_WEAK_COMMON * 16 + DYN_UNDEF:
+ // A new dynamic undefined reference tells us nothing.
+ return;
case DEF * 16 + DYN_WEAK_UNDEF:
case WEAK_DEF * 16 + DYN_WEAK_UNDEF:
case WEAK_COMMON * 16 + DYN_WEAK_UNDEF:
case DYN_COMMON * 16 + DYN_WEAK_UNDEF:
case DYN_WEAK_COMMON * 16 + DYN_WEAK_UNDEF:
+ // A new weak dynamic undefined reference tells us nothing.
+ return;
case DEF * 16 + COMMON:
+ // A common symbol does not override a definition.
+ return;
+
case WEAK_DEF * 16 + COMMON:
case DYN_DEF * 16 + COMMON:
case DYN_WEAK_DEF * 16 + COMMON:
+ // A common symbol does override a weak definition or a dynamic
+ // definition.
+ to->override(sym, object, version);
+ return;
+
case UNDEF * 16 + COMMON:
case WEAK_UNDEF * 16 + COMMON:
case DYN_UNDEF * 16 + COMMON:
case DYN_WEAK_UNDEF * 16 + COMMON:
+ // A common symbol is a definition for a reference.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + COMMON:
+ // Set the size to the maximum.
+ if (sym.get_st_size() > to->symsize())
+ to->set_symsize(sym.get_st_size());
+ return;
+
case WEAK_COMMON * 16 + COMMON:
+ // I'm not sure just what a weak common symbol means, but
+ // presumably it can be overridden by a regular common symbol.
+ to->override(sym, object, version);
+ return;
+
case DYN_COMMON * 16 + COMMON:
case DYN_WEAK_COMMON * 16 + COMMON:
+ {
+ // Use the real common symbol, but adjust the size if necessary.
+ typename Sized_symbol<size>::Size_type symsize = to->symsize();
+ to->override(sym, object, version);
+ if (to->symsize() < symsize)
+ to->set_symsize(symsize);
+ }
+ return;
case DEF * 16 + WEAK_COMMON:
case WEAK_DEF * 16 + WEAK_COMMON:
case DYN_DEF * 16 + WEAK_COMMON:
case DYN_WEAK_DEF * 16 + WEAK_COMMON:
+ // Whatever a weak common symbol is, it won't override a
+ // definition.
+ return;
+
case UNDEF * 16 + WEAK_COMMON:
case WEAK_UNDEF * 16 + WEAK_COMMON:
case DYN_UNDEF * 16 + WEAK_COMMON:
case DYN_WEAK_UNDEF * 16 + WEAK_COMMON:
+ // A weak common symbol is better than an undefined symbol.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + WEAK_COMMON:
case WEAK_COMMON * 16 + WEAK_COMMON:
case DYN_COMMON * 16 + WEAK_COMMON:
case DYN_WEAK_COMMON * 16 + WEAK_COMMON:
+ // Ignore a weak common symbol in the presence of a real common
+ // symbol.
+ return;
case DEF * 16 + DYN_COMMON:
case WEAK_DEF * 16 + DYN_COMMON:
case DYN_DEF * 16 + DYN_COMMON:
case DYN_WEAK_DEF * 16 + DYN_COMMON:
+ // Ignore a dynamic common symbol in the presence of a
+ // definition.
+ return;
+
case UNDEF * 16 + DYN_COMMON:
case WEAK_UNDEF * 16 + DYN_COMMON:
case DYN_UNDEF * 16 + DYN_COMMON:
case DYN_WEAK_UNDEF * 16 + DYN_COMMON:
+ // A dynamic common symbol is a definition of sorts.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + DYN_COMMON:
case WEAK_COMMON * 16 + DYN_COMMON:
case DYN_COMMON * 16 + DYN_COMMON:
case DYN_WEAK_COMMON * 16 + DYN_COMMON:
+ // Set the size to the maximum.
+ if (sym.get_st_size() > to->symsize())
+ to->set_symsize(sym.get_st_size());
+ return;
case DEF * 16 + DYN_WEAK_COMMON:
case WEAK_DEF * 16 + DYN_WEAK_COMMON:
case DYN_DEF * 16 + DYN_WEAK_COMMON:
case DYN_WEAK_DEF * 16 + DYN_WEAK_COMMON:
+ // A common symbol is ignored in the face of a definition.
+ return;
+
case UNDEF * 16 + DYN_WEAK_COMMON:
case WEAK_UNDEF * 16 + DYN_WEAK_COMMON:
case DYN_UNDEF * 16 + DYN_WEAK_COMMON:
case DYN_WEAK_UNDEF * 16 + DYN_WEAK_COMMON:
+ // I guess a weak common symbol is better than a definition.
+ to->override(sym, object, version);
+ return;
+
case COMMON * 16 + DYN_WEAK_COMMON:
case WEAK_COMMON * 16 + DYN_WEAK_COMMON:
case DYN_COMMON * 16 + DYN_WEAK_COMMON:
case DYN_WEAK_COMMON * 16 + DYN_WEAK_COMMON:
+ // Set the size to the maximum.
+ if (sym.get_st_size() > to->symsize())
+ to->set_symsize(sym.get_st_size());
+ return;
- break;
+ default:
+ gold_unreachable();
}
}
template
void
Symbol_table::resolve<32, true>(
- Symbol* to,
+ Sized_symbol<32>* to,
const elfcpp::Sym<32, true>& sym,
- Object* object);
+ Object* object,
+ const char* version);
template
void
Symbol_table::resolve<32, false>(
- Symbol* to,
+ Sized_symbol<32>* to,
const elfcpp::Sym<32, false>& sym,
- Object* object);
+ Object* object,
+ const char* version);
template
void
Symbol_table::resolve<64, true>(
- Symbol* to,
+ Sized_symbol<64>* to,
const elfcpp::Sym<64, true>& sym,
- Object* object);
+ Object* object,
+ const char* version);
template
void
Symbol_table::resolve<64, false>(
- Symbol* to,
+ Sized_symbol<64>* to,
const elfcpp::Sym<64, false>& sym,
- Object* object);
+ Object* object,
+ const char* version);
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff