// resolve.cc -- symbol resolution for gold
+// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
#include "gold.h"
#include "elfcpp.h"
template<int size, bool big_endian>
void
Symbol::override_base(const elfcpp::Sym<size, big_endian>& sym,
- Object* object)
+ Object* object, const char* version)
{
- this->object_ = object;
- this->shnum_ = sym.get_st_shndx(); // FIXME: Handle SHN_XINDEX.
+ 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->other_ = sym.get_st_nonvis();
+ this->nonvis_ = sym.get_st_nonvis();
+ if (object->is_dynamic())
+ this->in_dyn_ = true;
+ else
+ this->in_reg_ = true;
}
// Override the fields in Sized_symbol.
template<bool big_endian>
void
Sized_symbol<size>::override(const elfcpp::Sym<size, big_endian>& sym,
- Object* object)
+ Object* object, const char* version)
{
- this->override_base(sym, object);
+ this->override_base(sym, object, version);
this->value_ = sym.get_st_value();
- this->size_ = sym.get_st_size();
+ 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.
+// Override TOSYM with symbol FROMSYM, defined in OBJECT, with version
+// VERSION. This handles all aliases of TOSYM.
template<int size, bool big_endian>
void
-Symbol_table::resolve(Sized_symbol<size>* to,
- const elfcpp::Sym<size, big_endian>& sym,
- Object* object)
+Symbol_table::override(Sized_symbol<size>* tosym,
+ const elfcpp::Sym<size, big_endian>& fromsym,
+ Object* object, const char* version)
{
- if (object->target()->has_resolve())
+ tosym->override(fromsym, object, version);
+ if (tosym->has_alias())
{
- Sized_target<size, big_endian>* sized_target;
- sized_target = object->sized_target SELECT_SIZE_ENDIAN_NAME (
- SELECT_SIZE_ENDIAN_ONLY(size, big_endian));
- sized_target->resolve(to, sym, object);
- return;
+ Symbol* sym = this->weak_aliases_[tosym];
+ gold_assert(sym != NULL);
+ Sized_symbol<size>* ssym;
+ ssym = this->get_sized_symbol SELECT_SIZE_NAME(size) (sym
+ SELECT_SIZE(size));
+ do
+ {
+ ssym->override(fromsym, object, version);
+ sym = this->weak_aliases_[ssym];
+ gold_assert(sym != NULL);
+ ssym = this->get_sized_symbol SELECT_SIZE_NAME(size) (
+ sym SELECT_SIZE(size));
+ }
+ while (ssym != tosym);
}
+}
- // Build a little code for each symbol.
- // Bit 0: 0 for global, 1 for weak.
- // Bit 1: 0 for regular object, 1 for shared object
- // Bits 2-3: 0 for normal, 1 for undefined, 2 for common
- // This gives us values from 0 to 11:
+// The resolve functions build a little code for each symbol.
+// Bit 0: 0 for global, 1 for weak.
+// Bit 1: 0 for regular object, 1 for shared object
+// Bits 2-3: 0 for normal, 1 for undefined, 2 for common
+// This gives us values from 0 to 11.
- enum
- {
- DEF = 0,
- WEAK_DEF = 1,
- DYN_DEF = 2,
- DYN_WEAK_DEF = 3,
- UNDEF = 4,
- WEAK_UNDEF = 5,
- DYN_UNDEF = 6,
- DYN_WEAK_UNDEF = 7,
- COMMON = 8,
- WEAK_COMMON = 9,
- DYN_COMMON = 10,
- DYN_WEAK_COMMON = 11
- };
+static const int global_or_weak_shift = 0;
+static const unsigned int global_flag = 0 << global_or_weak_shift;
+static const unsigned int weak_flag = 1 << global_or_weak_shift;
+
+static const int regular_or_dynamic_shift = 1;
+static const unsigned int regular_flag = 0 << regular_or_dynamic_shift;
+static const unsigned int dynamic_flag = 1 << regular_or_dynamic_shift;
+
+static const int def_undef_or_common_shift = 2;
+static const unsigned int def_flag = 0 << def_undef_or_common_shift;
+static const unsigned int undef_flag = 1 << def_undef_or_common_shift;
+static const unsigned int common_flag = 2 << def_undef_or_common_shift;
- int tobits;
- switch (to->binding())
+// This convenience function combines all the flags based on facts
+// about the symbol.
+
+static unsigned int
+symbol_to_bits(elfcpp::STB binding, bool is_dynamic,
+ unsigned int shndx, elfcpp::STT type)
+{
+ unsigned int bits;
+
+ switch (binding)
{
case elfcpp::STB_GLOBAL:
- tobits = 0;
+ bits = global_flag;
break;
case elfcpp::STB_WEAK:
- tobits = 1;
+ bits = weak_flag;
break;
case elfcpp::STB_LOCAL:
// We should only see externally visible symbols in the symbol
// table.
- abort();
+ gold_error(_("invalid STB_LOCAL symbol in external symbols"));
+ bits = global_flag;
default:
// Any target which wants to handle STB_LOOS, etc., needs to
// define a resolve method.
- abort();
+ gold_error(_("unsupported symbol binding"));
+ bits = global_flag;
}
- if (to->object() != NULL && to->object()->is_dynamic())
- tobits |= (1 << 1);
+ if (is_dynamic)
+ bits |= dynamic_flag;
+ else
+ bits |= regular_flag;
- switch (to->shnum())
+ switch (shndx)
{
case elfcpp::SHN_UNDEF:
- tobits |= (1 << 2);
+ bits |= undef_flag;
break;
case elfcpp::SHN_COMMON:
- tobits |= (2 << 2);
+ bits |= common_flag;
break;
default:
- if (to->type() == elfcpp::STT_COMMON)
- tobits |= (2 << 2);
+ if (type == elfcpp::STT_COMMON)
+ bits |= common_flag;
+ else
+ bits |= def_flag;
break;
}
- int frombits;
- switch (sym.get_st_bind())
- {
- case elfcpp::STB_GLOBAL:
- frombits = 0;
- break;
-
- case elfcpp::STB_WEAK:
- frombits = 1;
- break;
+ return bits;
+}
- case elfcpp::STB_LOCAL:
- fprintf(stderr,
- _("%s: %s: invalid STB_LOCAL symbol %s in external symbols\n"),
- program_name, object->name().c_str(), to->name());
- gold_exit(false);
+// Resolve a symbol. This is called the second and subsequent times
+// we see a symbol. TO is the pre-existing symbol. ORIG_SYM is the
+// new symbol, seen in OBJECT. SYM is almost always identical to
+// ORIG_SYM, but may be munged (for instance, if we determine the
+// symbol is in a to-be-discarded section, we'll set sym's shndx to
+// UNDEFINED). VERSION of the version of SYM.
- default:
- fprintf(stderr,
- _("%s: %s: unsupported symbol binding %d for symbol %s\n"),
- program_name, object->name().c_str(),
- static_cast<int>(sym.get_st_bind()), to->name());
- gold_exit(false);
+template<int size, bool big_endian>
+void
+Symbol_table::resolve(Sized_symbol<size>* to,
+ const elfcpp::Sym<size, big_endian>& sym,
+ const elfcpp::Sym<size, big_endian>& orig_sym,
+ Object* object, const char* version)
+{
+ if (object->target()->has_resolve())
+ {
+ 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;
}
- if (object->is_dynamic())
+ 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())
+ unsigned int frombits = symbol_to_bits(sym.get_st_bind(),
+ object->is_dynamic(),
+ sym.get_st_shndx(),
+ sym.get_st_type());
+
+ bool adjust_common_sizes;
+ if (Symbol_table::should_override(to, frombits, object,
+ &adjust_common_sizes))
{
- case elfcpp::SHN_UNDEF:
- frombits |= (1 << 2);
- break;
+ typename Sized_symbol<size>::Size_type tosize = to->symsize();
- case elfcpp::SHN_COMMON:
- frombits |= (2 << 2);
- break;
+ this->override(to, sym, object, version);
- default:
- if (sym.get_st_type() == elfcpp::STT_COMMON)
- frombits |= (2 << 2);
- break;
+ if (adjust_common_sizes && tosize > to->symsize())
+ to->set_symsize(tosize);
+ }
+ else
+ {
+ if (adjust_common_sizes && sym.get_st_size() > to->symsize())
+ to->set_symsize(sym.get_st_size());
}
+ // A new weak undefined reference, merging with an old weak
+ // reference, could be a One Definition Rule (ODR) violation --
+ // especially if the types or sizes of the references differ. We'll
+ // store such pairs and look them up later to make sure they
+ // actually refer to the same lines of code. (Note: not all ODR
+ // violations can be found this way, and not everything this finds
+ // is an ODR violation. But it's helpful to warn about.)
+ // We use orig_sym here because we want the symbol exactly as it
+ // appears in the object file, not munged via our future processing.
+ if (parameters->detect_odr_violations()
+ && orig_sym.get_st_bind() == elfcpp::STB_WEAK
+ && to->binding() == elfcpp::STB_WEAK
+ && orig_sym.get_st_shndx() != elfcpp::SHN_UNDEF
+ && to->shndx() != elfcpp::SHN_UNDEF
+ && orig_sym.get_st_size() != 0 // Ignore weird 0-sized symbols.
+ && to->symsize() != 0
+ && (orig_sym.get_st_type() != to->type()
+ || orig_sym.get_st_size() != to->symsize())
+ // C does not have a concept of ODR, so we only need to do this
+ // on C++ symbols. These have (mangled) names starting with _Z.
+ && to->name()[0] == '_' && to->name()[1] == 'Z')
+ {
+ Symbol_location fromloc
+ = { object, orig_sym.get_st_shndx(), orig_sym.get_st_value() };
+ Symbol_location toloc = { to->object(), to->shndx(), to->value() };
+ this->candidate_odr_violations_[to->name()].insert(fromloc);
+ this->candidate_odr_violations_[to->name()].insert(toloc);
+ }
+}
+
+// Handle the core of symbol resolution. This is called with the
+// existing symbol, TO, and a bitflag describing the new symbol. This
+// returns true if we should override the existing symbol with the new
+// one, and returns false otherwise. It sets *ADJUST_COMMON_SIZES to
+// true if we should set the symbol size to the maximum of the TO and
+// FROM sizes. It handles error conditions.
+
+bool
+Symbol_table::should_override(const Symbol* to, unsigned int frombits,
+ Object* object, bool* adjust_common_sizes)
+{
+ *adjust_common_sizes = false;
+
+ unsigned int tobits = symbol_to_bits(to->binding(),
+ (to->source() == Symbol::FROM_OBJECT
+ && to->object()->is_dynamic()),
+ to->shndx(),
+ to->type());
+
// 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
// but that is no easier to understand than this large switch
// statement.
+ // These are the values generated by the bit codes.
+ enum
+ {
+ DEF = global_flag | regular_flag | def_flag,
+ WEAK_DEF = weak_flag | regular_flag | def_flag,
+ DYN_DEF = global_flag | dynamic_flag | def_flag,
+ DYN_WEAK_DEF = weak_flag | dynamic_flag | def_flag,
+ UNDEF = global_flag | regular_flag | undef_flag,
+ WEAK_UNDEF = weak_flag | regular_flag | undef_flag,
+ DYN_UNDEF = global_flag | dynamic_flag | undef_flag,
+ DYN_WEAK_UNDEF = weak_flag | dynamic_flag | undef_flag,
+ COMMON = global_flag | regular_flag | common_flag,
+ WEAK_COMMON = weak_flag | regular_flag | common_flag,
+ DYN_COMMON = global_flag | dynamic_flag | common_flag,
+ DYN_WEAK_COMMON = weak_flag | dynamic_flag | common_flag
+ };
+
switch (tobits * 16 + frombits)
{
case DEF * 16 + DEF:
// Two definitions of the same symbol.
- fprintf(stderr, "%s: %s: multiple definition of %s\n",
- program_name, object->name().c_str(), to->name());
- // FIXME: Report locations. Record that we have seen an error.
- return;
+ // FIXME: Do a better job of reporting locations.
+ gold_error(_("%s: multiple definition of %s"),
+ object != NULL ? object->name().c_str() : _("command line"),
+ to->demangled_name().c_str());
+ gold_error(_("%s: previous definition here"),
+ (to->source() == Symbol::FROM_OBJECT
+ ? to->object()->name().c_str()
+ : _("command line")));
+ return false;
case WEAK_DEF * 16 + DEF:
// We've seen a weak definition, and now we see a strong
// 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);
- return;
+ return true;
case DYN_DEF * 16 + DEF:
case DYN_WEAK_DEF * 16 + DEF:
// definition in a regular object. The definition in the
// regular object overrides the definition in the dynamic
// object.
- to->override(sym, object);
- return;
+ return true;
case UNDEF * 16 + DEF:
case WEAK_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);
- return;
+ return true;
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 a
+ // definition overrides. FIXME: We should optionally issue, version a
// warning.
- to->override(sym, object);
- return;
+ return true;
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;
+ return false;
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);
- return;
+ return true;
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);
- return;
+ return true;
case COMMON * 16 + WEAK_DEF:
case WEAK_COMMON * 16 + WEAK_DEF:
// A weak definition does not override a common definition.
- return;
+ return false;
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);
- return;
+ return true;
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;
+ return false;
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);
- return;
+ return true;
case COMMON * 16 + DYN_DEF:
case WEAK_COMMON * 16 + DYN_DEF:
case DYN_WEAK_COMMON * 16 + DYN_DEF:
// Ignore a dynamic definition if we already have a common
// definition.
- return;
+ return false;
case DEF * 16 + DYN_WEAK_DEF:
case WEAK_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;
+ return false;
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);
- return;
+ return true;
case COMMON * 16 + DYN_WEAK_DEF:
case WEAK_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;
+ return false;
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 false;
+
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.
+ return true;
+
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;
+ return false;
case DEF * 16 + WEAK_UNDEF:
case WEAK_DEF * 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;
+ return false;
case DEF * 16 + DYN_UNDEF:
case WEAK_DEF * 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;
+ return false;
case DEF * 16 + DYN_WEAK_UNDEF:
case WEAK_DEF * 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;
+ return false;
case DEF * 16 + COMMON:
// A common symbol does not override a definition.
- return;
+ return false;
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);
- return;
+ return true;
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);
- return;
+ return true;
case COMMON * 16 + COMMON:
+ // Set the size to the maximum.
+ *adjust_common_sizes = true;
+ return false;
+
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.
+ return true;
+
case DYN_COMMON * 16 + COMMON:
case DYN_WEAK_COMMON * 16 + COMMON:
+ // Use the real common symbol, but adjust the size if necessary.
+ *adjust_common_sizes = true;
+ return true;
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 false;
+
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.
+ return true;
+
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 false;
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 false;
+
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.
+ return true;
+
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.
+ *adjust_common_sizes = true;
+ return false;
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 false;
+
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.
+ return true;
+
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:
- abort();
- break;
+ // Set the size to the maximum.
+ *adjust_common_sizes = true;
+ return false;
default:
- abort();
+ gold_unreachable();
+ }
+}
+
+// A special case of should_override which is only called for a strong
+// defined symbol from a regular object file. This is used when
+// defining special symbols.
+
+bool
+Symbol_table::should_override_with_special(const Symbol* to)
+{
+ bool adjust_common_sizes;
+ unsigned int frombits = global_flag | regular_flag | def_flag;
+ bool ret = Symbol_table::should_override(to, frombits, NULL,
+ &adjust_common_sizes);
+ gold_assert(!adjust_common_sizes);
+ return ret;
+}
+
+// Override symbol base with a special symbol.
+
+void
+Symbol::override_base_with_special(const Symbol* from)
+{
+ gold_assert(this->name_ == from->name_ || this->has_alias());
+
+ this->source_ = from->source_;
+ switch (from->source_)
+ {
+ case FROM_OBJECT:
+ this->u_.from_object = from->u_.from_object;
+ break;
+ case IN_OUTPUT_DATA:
+ this->u_.in_output_data = from->u_.in_output_data;
+ break;
+ case IN_OUTPUT_SEGMENT:
+ this->u_.in_output_segment = from->u_.in_output_segment;
+ break;
+ case CONSTANT:
+ break;
+ default:
+ gold_unreachable();
+ break;
+ }
+
+ if (from->version_ != NULL && this->version_ != from->version_)
+ {
+ gold_assert(this->version_ == NULL);
+ this->version_ = from->version_;
+ }
+
+ this->type_ = from->type_;
+ this->binding_ = from->binding_;
+ this->visibility_ = from->visibility_;
+ this->nonvis_ = from->nonvis_;
+
+ // Special symbols are always considered to be regular symbols.
+ this->in_reg_ = true;
+
+ if (from->needs_dynsym_entry_)
+ this->needs_dynsym_entry_ = true;
+ if (from->needs_dynsym_value_)
+ this->needs_dynsym_value_ = true;
+
+ // We shouldn't see these flags. If we do, we need to handle them
+ // somehow.
+ gold_assert(!from->is_target_special_ || this->is_target_special_);
+ gold_assert(!from->is_forwarder_);
+ gold_assert(!from->has_got_offset_);
+ gold_assert(!from->has_plt_offset_);
+ gold_assert(!from->has_warning_);
+ gold_assert(!from->is_copied_from_dynobj_);
+}
+
+// Override a symbol with a special symbol.
+
+template<int size>
+void
+Sized_symbol<size>::override_with_special(const Sized_symbol<size>* from)
+{
+ this->override_base_with_special(from);
+ this->value_ = from->value_;
+ this->symsize_ = from->symsize_;
+}
+
+// Override TOSYM with the special symbol FROMSYM. This handles all
+// aliases of TOSYM.
+
+template<int size>
+void
+Symbol_table::override_with_special(Sized_symbol<size>* tosym,
+ const Sized_symbol<size>* fromsym)
+{
+ tosym->override_with_special(fromsym);
+ if (tosym->has_alias())
+ {
+ Symbol* sym = this->weak_aliases_[tosym];
+ gold_assert(sym != NULL);
+ Sized_symbol<size>* ssym;
+ ssym = this->get_sized_symbol SELECT_SIZE_NAME(size) (sym
+ SELECT_SIZE(size));
+ do
+ {
+ ssym->override_with_special(fromsym);
+ sym = this->weak_aliases_[ssym];
+ gold_assert(sym != NULL);
+ ssym = this->get_sized_symbol SELECT_SIZE_NAME(size) (
+ sym SELECT_SIZE(size));
+ }
+ while (ssym != tosym);
}
}
// script to restrict this to only the ones needed for implemented
// targets.
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Symbol_table::resolve<32, false>(
+ Sized_symbol<32>* to,
+ const elfcpp::Sym<32, false>& sym,
+ const elfcpp::Sym<32, false>& orig_sym,
+ Object* object,
+ const char* version);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
template
void
Symbol_table::resolve<32, true>(
Sized_symbol<32>* to,
const elfcpp::Sym<32, true>& sym,
- Object* object);
+ const elfcpp::Sym<32, true>& orig_sym,
+ Object* object,
+ const char* version);
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
void
-Symbol_table::resolve<32, false>(
- Sized_symbol<32>* to,
- const elfcpp::Sym<32, false>& sym,
- Object* object);
+Symbol_table::resolve<64, false>(
+ Sized_symbol<64>* to,
+ const elfcpp::Sym<64, false>& sym,
+ const elfcpp::Sym<64, false>& orig_sym,
+ Object* object,
+ const char* version);
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
void
Symbol_table::resolve<64, true>(
Sized_symbol<64>* to,
const elfcpp::Sym<64, true>& sym,
- Object* object);
+ const elfcpp::Sym<64, true>& orig_sym,
+ Object* object,
+ const char* version);
+#endif
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
template
void
-Symbol_table::resolve<64, false>(
- Sized_symbol<64>* to,
- const elfcpp::Sym<64, false>& sym,
- Object* object);
+Symbol_table::override_with_special<32>(Sized_symbol<32>*,
+ const Sized_symbol<32>*);
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+void
+Symbol_table::override_with_special<64>(Sized_symbol<64>*,
+ const Sized_symbol<64>*);
+#endif
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff