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PR 9836
* symtab.cc (Symbol_table::add_from_object): If the visibility is hidden or internal, force the symbol to be local. * resolve.cc (Symbol::override_visibility): Define. (Symbol::override_base): Use override_visibility. (Symbol_table::resolve): Likewise. (Symbol::override_base_with_special): Likewise. (Symbol_table::override_with_special): If the visibility is hidden or internal, force the symbol to be local. * symtab.h (class Symbol): Add set_visibility and override_visibility. * testsuite/ver_test_1.sh: New file. * testsuite/Makefile.am (check_SCRIPTS): Add ver_test_1.sh. (check_DATA): Add ver_test_1.syms. (ver_test_1.syms): New target. * testsuite/Makefile.in: Rebuild.
This commit is contained in:
Ian Lance Taylor
parent
b5096abe11
commit
0602e05a84
@ -1,3 +1,22 @@
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2009-02-27 Ian Lance Taylor <iant@google.com>
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PR 9836
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* symtab.cc (Symbol_table::add_from_object): If the visibility is
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hidden or internal, force the symbol to be local.
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* resolve.cc (Symbol::override_visibility): Define.
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(Symbol::override_base): Use override_visibility.
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(Symbol_table::resolve): Likewise.
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(Symbol::override_base_with_special): Likewise.
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(Symbol_table::override_with_special): If the visibility is hidden
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or internal, force the symbol to be local.
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* symtab.h (class Symbol): Add set_visibility and
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override_visibility.
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* testsuite/ver_test_1.sh: New file.
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* testsuite/Makefile.am (check_SCRIPTS): Add ver_test_1.sh.
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(check_DATA): Add ver_test_1.syms.
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(ver_test_1.syms): New target.
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* testsuite/Makefile.in: Rebuild.
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2009-02-25 Cary Coutant <ccoutant@google.com>
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* layout.cc (Layout::choose_output_section): Don't rename sections
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@ -1,6 +1,6 @@
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// resolve.cc -- symbol resolution for gold
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// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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@ -63,6 +63,26 @@ Symbol::override_version(const char* version)
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}
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}
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// This symbol is being overidden by another symbol whose visibility
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// is VISIBILITY. Updated the VISIBILITY_ field accordingly.
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inline void
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Symbol::override_visibility(elfcpp::STV visibility)
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{
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// The rule for combining visibility is that we always choose the
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// most constrained visibility. In order of increasing constraint,
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// visibility goes PROTECTED, HIDDEN, INTERNAL. This is the reverse
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// of the numeric values, so the effect is that we always want the
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// smallest non-zero value.
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if (visibility != elfcpp::STV_DEFAULT)
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{
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if (this->visibility_ == elfcpp::STV_DEFAULT)
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this->visibility_ = visibility;
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else if (this->visibility_ > visibility)
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this->visibility_ = visibility;
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}
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}
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// Override the fields in Symbol.
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template<int size, bool big_endian>
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@ -78,7 +98,7 @@ Symbol::override_base(const elfcpp::Sym<size, big_endian>& sym,
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this->is_ordinary_shndx_ = is_ordinary;
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this->type_ = sym.get_st_type();
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this->binding_ = sym.get_st_bind();
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this->visibility_ = sym.get_st_visibility();
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this->override_visibility(sym.get_st_visibility());
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this->nonvis_ = sym.get_st_nonvis();
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if (object->is_dynamic())
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this->in_dyn_ = true;
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@ -279,6 +299,9 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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{
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if (adjust_common_sizes && sym.get_st_size() > to->symsize())
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to->set_symsize(sym.get_st_size());
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// The ELF ABI says that even for a reference to a symbol we
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// merge the visibility.
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to->override_visibility(sym.get_st_visibility());
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}
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// A new weak undefined reference, merging with an old weak
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@ -721,7 +744,7 @@ Symbol::override_base_with_special(const Symbol* from)
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this->override_version(from->version_);
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this->type_ = from->type_;
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this->binding_ = from->binding_;
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this->visibility_ = from->visibility_;
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this->override_visibility(from->visibility_);
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this->nonvis_ = from->nonvis_;
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// Special symbols are always considered to be regular symbols.
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@ -776,7 +799,12 @@ Symbol_table::override_with_special(Sized_symbol<size>* tosym,
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}
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while (ssym != tosym);
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}
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if (tosym->binding() == elfcpp::STB_LOCAL)
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if (tosym->binding() == elfcpp::STB_LOCAL
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|| ((tosym->visibility() == elfcpp::STV_HIDDEN
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|| tosym->visibility() == elfcpp::STV_INTERNAL)
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&& (tosym->binding() == elfcpp::STB_GLOBAL
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|| tosym->binding() == elfcpp::STB_WEAK)
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&& !parameters->options().relocatable()))
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this->force_local(tosym);
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}
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@ -648,7 +648,8 @@ Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from)
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this->gc_mark_dyn_syms(to);
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}
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// Record that a symbol is forced to be local by a version script.
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// Record that a symbol is forced to be local by a version script or
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// by visibility.
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void
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Symbol_table::force_local(Symbol* sym)
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@ -962,6 +963,15 @@ Symbol_table::add_from_object(Object* object,
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this->tls_commons_.push_back(ret);
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}
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// If we're not doing a relocatable link, then any symbol with
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// hidden or internal visibility is local.
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if ((ret->visibility() == elfcpp::STV_HIDDEN
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|| ret->visibility() == elfcpp::STV_INTERNAL)
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&& (ret->binding() == elfcpp::STB_GLOBAL
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|| ret->binding() == elfcpp::STB_WEAK)
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&& !parameters->options().relocatable())
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this->force_local(ret);
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if (def)
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ret->set_is_default();
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return ret;
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@ -1179,7 +1189,7 @@ Symbol_table::add_from_pluginobj(
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def, *sym, st_shndx, true, st_shndx);
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if (local)
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this->force_local(res);
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this->force_local(res);
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return res;
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}
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@ -1,6 +1,6 @@
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// symtab.h -- the gold symbol table -*- C++ -*-
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// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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@ -210,6 +210,15 @@ class Symbol
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visibility() const
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{ return this->visibility_; }
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// Set the visibility.
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void
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set_visibility(elfcpp::STV visibility)
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{ this->visibility_ = visibility; }
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// Override symbol visibility.
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void
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override_visibility(elfcpp::STV);
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// Return the non-visibility part of the st_other field.
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unsigned char
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nonvis() const
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@ -1384,7 +1393,8 @@ class Symbol_table
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void
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resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from);
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// Record that a symbol is forced to be local by a version script.
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// Record that a symbol is forced to be local by a version script or
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// by visibility.
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void
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force_local(Symbol*);
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@ -742,6 +742,11 @@ ver_test_3.o: ver_test_3.cc
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ver_test_4.o: ver_test_4.cc
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$(CXXCOMPILE) -c -fpic -o $@ $<
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check_SCRIPTS += ver_test_1.sh
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check_DATA += ver_test_1.syms
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ver_test_1.syms: ver_test_1.so
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$(TEST_READELF) -s $< >$@ 2>/dev/null
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check_PROGRAMS += ver_test_2
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ver_test_2_SOURCES = ver_test_main_2.cc
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ver_test_2_DEPENDENCIES = gcctestdir/ld ver_test_4.so ver_test_2.so
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@ -166,9 +166,10 @@ check_PROGRAMS = object_unittest$(EXEEXT) binary_unittest$(EXEEXT) \
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# Test --dynamic-list, --dynamic-list-data, --dynamic-list-cpp-new,
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# and --dynamic-list-cpp-typeinfo
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@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_6 = weak_plt.sh debug_msg.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ undef_symbol.sh ver_test_2.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_4.sh ver_test_5.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_7.sh ver_test_10.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ undef_symbol.sh ver_test_1.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_2.sh ver_test_4.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_5.sh ver_test_7.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_10.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_matching_test.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_3.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_4.sh \
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@ -183,9 +184,10 @@ check_PROGRAMS = object_unittest$(EXEEXT) binary_unittest$(EXEEXT) \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_7 = weak_plt_shared.so \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ debug_msg.err debug_msg_so.err \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ debug_msg_ndebug.err \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ undef_symbol.err ver_test_2.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_4.syms ver_test_5.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_7.syms ver_test_10.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ undef_symbol.err ver_test_1.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_2.syms ver_test_4.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_5.syms ver_test_7.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_10.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_matching_test.stdout \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_3.stdout \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_4.stdout \
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@ -2404,6 +2406,8 @@ uninstall-am: uninstall-info-am
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXCOMPILE) -c -fpic -o $@ $<
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_4.o: ver_test_4.cc
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXCOMPILE) -c -fpic -o $@ $<
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_1.syms: ver_test_1.so
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) -s $< >$@ 2>/dev/null
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_2.syms: ver_test_2
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) -s $< >$@ 2>/dev/null
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_4.syms: ver_test_4.so
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30
gold/testsuite/ver_test_1.sh
Executable file
30
gold/testsuite/ver_test_1.sh
Executable file
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#!/bin/sh
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# ver_test_1.sh -- check that protected symbols are local
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# Copyright 2009 Free Software Foundation, Inc.
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# Written by Ian Lance Taylor <iant@google.com>.
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# This file is part of gold.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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syms=`grep ' HIDDEN ' ver_test_1.syms | grep ' GLOBAL '`
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if test -n "$syms"; then
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echo "Found GLOBAL HIDDEN symbols"
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echo $syms
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exit 1
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fi
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