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* resolve.cc (Symbol_table::resolve): Remember whether undef was

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weak when resolving to a dynamic def.
	(Symbol_table::should_override): Add adjust_dyndef flag; set it
	for weak undef/dynamic def cases. Adjust callers.
	* symtab.cc (Symbol::init_fields): Initialize undef_binding_set_ and
	undef_binding_weak_.
	(Symbol_table::sized_write_globals): Adjust symbol binding.
	(Symbol_table::sized_write_symbol): Add binding parameter.
	* symtab.h (Symbol::set_undef_binding): New method.
	(Symbol::is_undef_binding_weak): New method.
	(Symbol::undef_binding_set_, Symbol::undef_binding_weak_): New members.
	(Symbol_table::should_override): Add new parameter.
	(Symbol_table::sized_write_symbol): Add new parameter.

	* testsuite/weak_undef_file1.cc: Add new test case.
	* testsuite/weak_undef_file2.cc: Fix header comment.
	* testsuite/weak_undef_test.cc: Add new test case.
This commit is contained in:
Cary Coutant
2010-07-09 01:34:31 +00:00
parent 2ee2fea804
commit ce279a62c4
7 changed files with 127 additions and 19 deletions
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57
gold/resolve.cc
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@@ -335,18 +335,33 @@ Symbol_table::resolve(Sized_symbol<size>* to,
sym.get_st_type());
bool adjust_common_sizes;
bool adjust_dyndef;
typename Sized_symbol<size>::Size_type tosize = to->symsize();
if (Symbol_table::should_override(to, frombits, OBJECT, object,
&adjust_common_sizes))
&adjust_common_sizes,
&adjust_dyndef))
{
elfcpp::STB tobinding = to->binding();
this->override(to, sym, st_shndx, is_ordinary, object, version);
if (adjust_common_sizes && tosize > to->symsize())
to->set_symsize(tosize);
if (adjust_dyndef)
{
// We are overriding an UNDEF or WEAK UNDEF with a DYN DEF.
// Remember which kind of UNDEF it was for future reference.
to->set_undef_binding(tobinding);
}
}
else
{
if (adjust_common_sizes && sym.get_st_size() > tosize)
to->set_symsize(sym.get_st_size());
if (adjust_dyndef)
{
// We are keeping a DYN DEF after seeing an UNDEF or WEAK UNDEF.
// Remember which kind of UNDEF it was.
to->set_undef_binding(sym.get_st_bind());
}
// The ELF ABI says that even for a reference to a symbol we
// merge the visibility.
to->override_visibility(sym.get_st_visibility());
@@ -381,9 +396,11 @@ Symbol_table::resolve(Sized_symbol<size>* to,
bool
Symbol_table::should_override(const Symbol* to, unsigned int frombits,
Defined defined, Object* object,
bool* adjust_common_sizes)
bool* adjust_common_sizes,
bool* adjust_dyndef)
{
*adjust_common_sizes = false;
*adjust_dyndef = false;
unsigned int tobits;
if (to->source() == Symbol::IS_UNDEFINED)
@@ -531,12 +548,17 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
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.
return true;
case WEAK_UNDEF * 16 + DYN_DEF:
// When overriding a weak undef by a dynamic definition,
// we need to remember that the original undef was weak.
*adjust_dyndef = true;
return true;
case COMMON * 16 + DYN_DEF:
case WEAK_COMMON * 16 + DYN_DEF:
case DYN_COMMON * 16 + DYN_DEF:
@@ -554,12 +576,17 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
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.
return true;
case WEAK_UNDEF * 16 + DYN_WEAK_DEF:
// When overriding a weak undef by a dynamic definition,
// we need to remember that the original undef was weak.
*adjust_dyndef = true;
return true;
case COMMON * 16 + DYN_WEAK_DEF:
case WEAK_COMMON * 16 + DYN_WEAK_DEF:
case DYN_COMMON * 16 + DYN_WEAK_DEF:
@@ -570,12 +597,16 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
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 DYN_DEF * 16 + UNDEF:
case DYN_WEAK_DEF * 16 + UNDEF:
// For a dynamic def, we need to remember which kind of undef we see.
*adjust_dyndef = true;
return false;
case WEAK_UNDEF * 16 + UNDEF:
case DYN_UNDEF * 16 + UNDEF:
case DYN_WEAK_UNDEF * 16 + UNDEF:
@@ -591,8 +622,6 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
case DEF * 16 + WEAK_UNDEF:
case WEAK_DEF * 16 + WEAK_UNDEF:
case DYN_DEF * 16 + WEAK_UNDEF:
case DYN_WEAK_DEF * 16 + WEAK_UNDEF:
case UNDEF * 16 + WEAK_UNDEF:
case WEAK_UNDEF * 16 + WEAK_UNDEF:
case DYN_UNDEF * 16 + WEAK_UNDEF:
@@ -604,6 +633,12 @@ Symbol_table::should_override(const Symbol* to, unsigned int frombits,
// A new weak undefined reference tells us nothing.
return false;
case DYN_DEF * 16 + WEAK_UNDEF:
case DYN_WEAK_DEF * 16 + WEAK_UNDEF:
// For a dynamic def, we need to remember which kind of undef we see.
*adjust_dyndef = true;
return false;
case DEF * 16 + DYN_UNDEF:
case WEAK_DEF * 16 + DYN_UNDEF:
case DYN_DEF * 16 + DYN_UNDEF:
@@ -811,10 +846,12 @@ bool
Symbol_table::should_override_with_special(const Symbol* to, Defined defined)
{
bool adjust_common_sizes;
bool adjust_dyn_def;
unsigned int frombits = global_flag | regular_flag | def_flag;
bool ret = Symbol_table::should_override(to, frombits, defined, NULL,
&adjust_common_sizes);
gold_assert(!adjust_common_sizes);
&adjust_common_sizes,
&adjust_dyn_def);
gold_assert(!adjust_common_sizes && !adjust_dyn_def);
return ret;
}