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[GOLD] Reduce size of class Symbol

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On 64-bit targets there is a 32-bit hole in symbol->u_, and another
due to symbol flags exceeding 32 bits.  By splitting the union,
the total size of the class reduces by one 64-bit word.

	* symtab.h (Symbol): Split u_ into u1_ and u2_.  Adjust accessors
	to suit.  Move plt_offset_ before got_offsets_.
	* symtab.cc (Symbol::init_fields): Adjust for union change.
	(Symbol::init_base_output_data): Likewise.
	(Symbol::init_base_output_segment): Likewise.
	(Symbol::allocate_base_common): Likewise.
	(Symbol::output_section): Likewise.
	(Symbol::set_output_section): Likewise.
	(Symbol::set_output_segment): Likewise.
	* resolve.cc (Symbol::override_base): Likewise.
	(Symbol::override_base_with_special): Likewise.
This commit is contained in:
Alan Modra
2017-08-29 15:52:45 +09:30
parent f2d394fce1
commit 34ca2bd7ac
4 changed files with 79 additions and 68 deletions
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11
gold/resolve.cc
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@@ -92,9 +92,9 @@ 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;
this->u1_.object = object;
this->override_version(version);
this->u_.from_object.shndx = st_shndx;
this->u2_.shndx = st_shndx;
this->is_ordinary_shndx_ = is_ordinary;
// Don't override st_type from plugin placeholder symbols.
if (object->pluginobj() == NULL)
@@ -952,13 +952,10 @@ Symbol::override_base_with_special(const Symbol* from)
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;
this->u1_ = from->u1_;
this->u2_ = from->u2_;
break;
case IS_CONSTANT:
case IS_UNDEFINED: