Let special symbols override existing symbols rather than
reinitializing them.
This commit is contained in:
parent
8ae3da9046
commit
86f2e68346
395
gold/resolve.cc
395
gold/resolve.cc
@ -51,6 +51,25 @@ Sized_symbol<size>::override(const elfcpp::Sym<size, big_endian>& sym,
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this->symsize_ = sym.get_st_size();
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}
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// The resolve functions build a little code for each symbol.
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// Bit 0: 0 for global, 1 for weak.
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// Bit 1: 0 for regular object, 1 for shared object
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// Bits 2-3: 0 for normal, 1 for undefined, 2 for common
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// This gives us values from 0 to 11.
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static const int global_or_weak_shift = 0;
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static const unsigned int global_flag = 0 << global_or_weak_shift;
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static const unsigned int weak_flag = 1 << global_or_weak_shift;
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static const int regular_or_dynamic_shift = 1;
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static const unsigned int regular_flag = 0 << regular_or_dynamic_shift;
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static const unsigned int dynamic_flag = 1 << regular_or_dynamic_shift;
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static const int def_undef_or_common_shift = 2;
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static const unsigned int def_flag = 0 << def_undef_or_common_shift;
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static const unsigned int undef_flag = 1 << def_undef_or_common_shift;
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static const unsigned int common_flag = 2 << def_undef_or_common_shift;
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// Resolve a symbol. This is called the second and subsequent times
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// we see a symbol. TO is the pre-existing symbol. SYM is the new
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// symbol, seen in OBJECT. VERSION of the version of SYM.
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@ -71,79 +90,26 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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return;
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}
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// Build a little code for each symbol.
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// Bit 0: 0 for global, 1 for weak.
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// Bit 1: 0 for regular object, 1 for shared object
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// Bits 2-3: 0 for normal, 1 for undefined, 2 for common
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// This gives us values from 0 to 11:
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enum
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{
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DEF = 0,
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WEAK_DEF = 1,
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DYN_DEF = 2,
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DYN_WEAK_DEF = 3,
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UNDEF = 4,
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WEAK_UNDEF = 5,
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DYN_UNDEF = 6,
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DYN_WEAK_UNDEF = 7,
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COMMON = 8,
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WEAK_COMMON = 9,
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DYN_COMMON = 10,
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DYN_WEAK_COMMON = 11
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};
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int tobits;
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switch (to->binding())
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if (!object->is_dynamic())
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{
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case elfcpp::STB_GLOBAL:
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tobits = 0;
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break;
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case elfcpp::STB_WEAK:
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tobits = 1;
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break;
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case elfcpp::STB_LOCAL:
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// We should only see externally visible symbols in the symbol
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// table.
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gold_unreachable();
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default:
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// Any target which wants to handle STB_LOOS, etc., needs to
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// define a resolve method.
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gold_unreachable();
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// Record that we've seen this symbol in a regular object.
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to->set_in_reg();
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}
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else
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{
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// Record that we've seen this symbol in a dynamic object.
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to->set_in_dyn();
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}
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if (to->source() == Symbol::FROM_OBJECT
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&& to->object()->is_dynamic())
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tobits |= (1 << 1);
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switch (to->shndx())
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{
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case elfcpp::SHN_UNDEF:
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tobits |= (1 << 2);
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break;
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case elfcpp::SHN_COMMON:
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tobits |= (2 << 2);
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break;
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default:
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if (to->type() == elfcpp::STT_COMMON)
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tobits |= (2 << 2);
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break;
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}
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int frombits;
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unsigned int frombits;
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switch (sym.get_st_bind())
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{
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case elfcpp::STB_GLOBAL:
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frombits = 0;
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frombits = global_flag;
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break;
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case elfcpp::STB_WEAK:
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frombits = 1;
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frombits = weak_flag;
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break;
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case elfcpp::STB_LOCAL:
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@ -161,31 +127,101 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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}
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if (!object->is_dynamic())
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{
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// Record that we've seen this symbol in a regular object.
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to->set_in_reg();
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}
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frombits |= regular_flag;
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else
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{
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frombits |= (1 << 1);
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// Record that we've seen this symbol in a dynamic object.
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to->set_in_dyn();
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}
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frombits |= dynamic_flag;
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switch (sym.get_st_shndx())
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{
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case elfcpp::SHN_UNDEF:
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frombits |= (1 << 2);
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frombits |= undef_flag;
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break;
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case elfcpp::SHN_COMMON:
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frombits |= (2 << 2);
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frombits |= common_flag;
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break;
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default:
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if (sym.get_st_type() == elfcpp::STT_COMMON)
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frombits |= (2 << 2);
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frombits |= common_flag;
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else
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frombits |= def_flag;
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break;
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}
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bool adjust_common_sizes;
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if (Symbol_table::should_override(to, frombits, &adjust_common_sizes))
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{
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typename Sized_symbol<size>::Size_type tosize = to->symsize();
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to->override(sym, object, version);
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if (adjust_common_sizes && tosize > to->symsize())
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to->set_symsize(tosize);
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}
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else
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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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}
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}
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// Handle the core of symbol resolution. This is called with the
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// existing symbol, TO, and a bitflag describing the new symbol. This
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// returns true if we should override the existing symbol with the new
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// one, and returns false otherwise. It sets *ADJUST_COMMON_SIZES to
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// true if we should set the symbol size to the maximum of the TO and
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// FROM sizes. It handles error conditions.
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bool
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Symbol_table::should_override(const Symbol* to, unsigned int frombits,
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bool* adjust_common_sizes)
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{
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*adjust_common_sizes = false;
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unsigned int tobits;
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switch (to->binding())
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{
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case elfcpp::STB_GLOBAL:
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tobits = global_flag;
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break;
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case elfcpp::STB_WEAK:
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tobits = weak_flag;
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break;
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case elfcpp::STB_LOCAL:
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// We should only see externally visible symbols in the symbol
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// table.
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gold_unreachable();
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default:
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// Any target which wants to handle STB_LOOS, etc., needs to
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// define a resolve method.
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gold_unreachable();
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}
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if (to->source() == Symbol::FROM_OBJECT
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&& to->object()->is_dynamic())
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tobits |= dynamic_flag;
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else
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tobits |= regular_flag;
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switch (to->shndx())
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{
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case elfcpp::SHN_UNDEF:
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tobits |= undef_flag;
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break;
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case elfcpp::SHN_COMMON:
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tobits |= common_flag;
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break;
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default:
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if (to->type() == elfcpp::STT_COMMON)
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tobits |= common_flag;
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else
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tobits |= def_flag;
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break;
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}
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@ -199,14 +235,31 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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// but that is no easier to understand than this large switch
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// statement.
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// These are the values generated by the bit codes.
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enum
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{
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DEF = global_flag | regular_flag | def_flag,
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WEAK_DEF = weak_flag | regular_flag | def_flag,
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DYN_DEF = global_flag | dynamic_flag | def_flag,
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DYN_WEAK_DEF = weak_flag | dynamic_flag | def_flag,
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UNDEF = global_flag | regular_flag | undef_flag,
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WEAK_UNDEF = weak_flag | regular_flag | undef_flag,
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DYN_UNDEF = global_flag | dynamic_flag | undef_flag,
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DYN_WEAK_UNDEF = weak_flag | dynamic_flag | undef_flag,
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COMMON = global_flag | regular_flag | common_flag,
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WEAK_COMMON = weak_flag | regular_flag | common_flag,
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DYN_COMMON = global_flag | dynamic_flag | common_flag,
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DYN_WEAK_COMMON = weak_flag | dynamic_flag | common_flag
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};
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switch (tobits * 16 + frombits)
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{
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case DEF * 16 + DEF:
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// Two definitions of the same symbol.
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fprintf(stderr, "%s: %s: multiple definition of %s\n",
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program_name, object->name().c_str(), to->name());
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fprintf(stderr, "%s: multiple definition of %s\n",
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program_name, to->name());
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// FIXME: Report locations. Record that we have seen an error.
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return;
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return false;
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case WEAK_DEF * 16 + DEF:
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// We've seen a weak definition, and now we see a strong
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@ -217,8 +270,7 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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// are currently compatible with the GNU linker. In the future
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// we should add a target specific option to change this.
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// FIXME.
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to->override(sym, object, version);
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return;
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return true;
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case DYN_DEF * 16 + DEF:
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case DYN_WEAK_DEF * 16 + DEF:
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@ -226,8 +278,7 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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// definition in a regular object. The definition in the
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// regular object overrides the definition in the dynamic
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// object.
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to->override(sym, object, version);
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return;
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return true;
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case UNDEF * 16 + DEF:
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case WEAK_UNDEF * 16 + DEF:
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@ -235,8 +286,7 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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case DYN_WEAK_UNDEF * 16 + DEF:
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// We've seen an undefined reference, and now we see a
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// definition. We use the definition.
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to->override(sym, object, version);
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return;
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return true;
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case COMMON * 16 + DEF:
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case WEAK_COMMON * 16 + DEF:
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@ -245,56 +295,51 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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// We've seen a common symbol and now we see a definition. The
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// definition overrides. FIXME: We should optionally issue, version a
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// warning.
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to->override(sym, object, version);
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return;
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return true;
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case DEF * 16 + WEAK_DEF:
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case WEAK_DEF * 16 + WEAK_DEF:
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// We've seen a definition and now we see a weak definition. We
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// ignore the new weak definition.
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return;
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return false;
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case DYN_DEF * 16 + WEAK_DEF:
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case DYN_WEAK_DEF * 16 + WEAK_DEF:
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// We've seen a dynamic definition and now we see a regular weak
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// definition. The regular weak definition overrides.
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to->override(sym, object, version);
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return;
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return true;
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case UNDEF * 16 + WEAK_DEF:
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case WEAK_UNDEF * 16 + WEAK_DEF:
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case DYN_UNDEF * 16 + WEAK_DEF:
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case DYN_WEAK_UNDEF * 16 + WEAK_DEF:
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// A weak definition of a currently undefined symbol.
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to->override(sym, object, version);
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return;
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return true;
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case COMMON * 16 + WEAK_DEF:
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case WEAK_COMMON * 16 + WEAK_DEF:
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// A weak definition does not override a common definition.
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return;
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return false;
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case DYN_COMMON * 16 + WEAK_DEF:
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case DYN_WEAK_COMMON * 16 + WEAK_DEF:
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// A weak definition does override a definition in a dynamic
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// object. FIXME: We should optionally issue a warning.
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to->override(sym, object, version);
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return;
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return true;
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case DEF * 16 + DYN_DEF:
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case WEAK_DEF * 16 + DYN_DEF:
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case DYN_DEF * 16 + DYN_DEF:
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case DYN_WEAK_DEF * 16 + DYN_DEF:
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// Ignore a dynamic definition if we already have a definition.
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return;
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return false;
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case UNDEF * 16 + DYN_DEF:
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case WEAK_UNDEF * 16 + DYN_DEF:
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case DYN_UNDEF * 16 + DYN_DEF:
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case DYN_WEAK_UNDEF * 16 + DYN_DEF:
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// Use a dynamic definition if we have a reference.
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to->override(sym, object, version);
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return;
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return true;
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case COMMON * 16 + DYN_DEF:
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case WEAK_COMMON * 16 + DYN_DEF:
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@ -302,7 +347,7 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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case DYN_WEAK_COMMON * 16 + DYN_DEF:
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// Ignore a dynamic definition if we already have a common
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// definition.
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return;
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return false;
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case DEF * 16 + DYN_WEAK_DEF:
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case WEAK_DEF * 16 + DYN_WEAK_DEF:
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@ -310,15 +355,14 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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case DYN_WEAK_DEF * 16 + DYN_WEAK_DEF:
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// Ignore a weak dynamic definition if we already have a
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// definition.
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return;
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return false;
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case UNDEF * 16 + DYN_WEAK_DEF:
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case WEAK_UNDEF * 16 + DYN_WEAK_DEF:
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case DYN_UNDEF * 16 + DYN_WEAK_DEF:
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case DYN_WEAK_UNDEF * 16 + DYN_WEAK_DEF:
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// Use a weak dynamic definition if we have a reference.
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to->override(sym, object, version);
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return;
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return true;
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case COMMON * 16 + DYN_WEAK_DEF:
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case WEAK_COMMON * 16 + DYN_WEAK_DEF:
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@ -326,7 +370,7 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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case DYN_WEAK_COMMON * 16 + DYN_WEAK_DEF:
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// Ignore a weak dynamic definition if we already have a common
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// definition.
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return;
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return false;
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case DEF * 16 + UNDEF:
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case WEAK_DEF * 16 + UNDEF:
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@ -334,21 +378,20 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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case DYN_WEAK_DEF * 16 + UNDEF:
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case UNDEF * 16 + UNDEF:
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// A new undefined reference tells us nothing.
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return;
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return false;
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case WEAK_UNDEF * 16 + UNDEF:
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case DYN_UNDEF * 16 + UNDEF:
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case DYN_WEAK_UNDEF * 16 + UNDEF:
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// A strong undef overrides a dynamic or weak undef.
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to->override(sym, object, version);
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return;
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return true;
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case COMMON * 16 + UNDEF:
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case WEAK_COMMON * 16 + UNDEF:
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case DYN_COMMON * 16 + UNDEF:
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case DYN_WEAK_COMMON * 16 + UNDEF:
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// A new undefined reference tells us nothing.
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return;
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return false;
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case DEF * 16 + WEAK_UNDEF:
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case WEAK_DEF * 16 + WEAK_UNDEF:
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@ -363,7 +406,7 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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case DYN_COMMON * 16 + WEAK_UNDEF:
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case DYN_WEAK_COMMON * 16 + WEAK_UNDEF:
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// A new weak undefined reference tells us nothing.
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return;
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return false;
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case DEF * 16 + DYN_UNDEF:
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case WEAK_DEF * 16 + DYN_UNDEF:
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@ -378,7 +421,7 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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case DYN_COMMON * 16 + DYN_UNDEF:
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case DYN_WEAK_COMMON * 16 + DYN_UNDEF:
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// A new dynamic undefined reference tells us nothing.
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return;
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return false;
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case DEF * 16 + DYN_WEAK_UNDEF:
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case WEAK_DEF * 16 + DYN_WEAK_UNDEF:
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@ -393,50 +436,41 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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case DYN_COMMON * 16 + DYN_WEAK_UNDEF:
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case DYN_WEAK_COMMON * 16 + DYN_WEAK_UNDEF:
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// A new weak dynamic undefined reference tells us nothing.
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return;
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return false;
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case DEF * 16 + COMMON:
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// A common symbol does not override a definition.
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return;
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return false;
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case WEAK_DEF * 16 + COMMON:
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case DYN_DEF * 16 + COMMON:
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case DYN_WEAK_DEF * 16 + COMMON:
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// A common symbol does override a weak definition or a dynamic
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// definition.
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to->override(sym, object, version);
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return;
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return true;
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case UNDEF * 16 + COMMON:
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case WEAK_UNDEF * 16 + COMMON:
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case DYN_UNDEF * 16 + COMMON:
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case DYN_WEAK_UNDEF * 16 + COMMON:
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// A common symbol is a definition for a reference.
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to->override(sym, object, version);
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return;
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return true;
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case COMMON * 16 + COMMON:
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// Set the size to the maximum.
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if (sym.get_st_size() > to->symsize())
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to->set_symsize(sym.get_st_size());
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return;
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*adjust_common_sizes = true;
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return false;
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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;
|
||||
return true;
|
||||
|
||||
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;
|
||||
// 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:
|
||||
@ -444,15 +478,14 @@ Symbol_table::resolve(Sized_symbol<size>* to,
|
||||
case DYN_WEAK_DEF * 16 + WEAK_COMMON:
|
||||
// Whatever a weak common symbol is, it won't override a
|
||||
// definition.
|
||||
return;
|
||||
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.
|
||||
to->override(sym, object, version);
|
||||
return;
|
||||
return true;
|
||||
|
||||
case COMMON * 16 + WEAK_COMMON:
|
||||
case WEAK_COMMON * 16 + WEAK_COMMON:
|
||||
@ -460,7 +493,7 @@ Symbol_table::resolve(Sized_symbol<size>* to,
|
||||
case DYN_WEAK_COMMON * 16 + WEAK_COMMON:
|
||||
// Ignore a weak common symbol in the presence of a real common
|
||||
// symbol.
|
||||
return;
|
||||
return false;
|
||||
|
||||
case DEF * 16 + DYN_COMMON:
|
||||
case WEAK_DEF * 16 + DYN_COMMON:
|
||||
@ -468,54 +501,114 @@ Symbol_table::resolve(Sized_symbol<size>* to,
|
||||
case DYN_WEAK_DEF * 16 + DYN_COMMON:
|
||||
// Ignore a dynamic common symbol in the presence of a
|
||||
// definition.
|
||||
return;
|
||||
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.
|
||||
to->override(sym, object, version);
|
||||
return;
|
||||
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.
|
||||
if (sym.get_st_size() > to->symsize())
|
||||
to->set_symsize(sym.get_st_size());
|
||||
return;
|
||||
*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;
|
||||
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.
|
||||
to->override(sym, object, version);
|
||||
return;
|
||||
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:
|
||||
// Set the size to the maximum.
|
||||
if (sym.get_st_size() > to->symsize())
|
||||
to->set_symsize(sym.get_st_size());
|
||||
return;
|
||||
*adjust_common_sizes = true;
|
||||
return false;
|
||||
|
||||
default:
|
||||
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, &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)
|
||||
{
|
||||
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;
|
||||
}
|
||||
|
||||
// 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_;
|
||||
}
|
||||
|
||||
// Instantiate the templates we need. We could use the configure
|
||||
// script to restrict this to only the ones needed for implemented
|
||||
// targets.
|
||||
@ -560,4 +653,16 @@ Symbol_table::resolve<64, true>(
|
||||
const char* version);
|
||||
#endif
|
||||
|
||||
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
|
||||
template
|
||||
void
|
||||
Sized_symbol<32>::override_with_special(const Sized_symbol<32>*);
|
||||
#endif
|
||||
|
||||
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
|
||||
template
|
||||
void
|
||||
Sized_symbol<64>::override_with_special(const Sized_symbol<64>*);
|
||||
#endif
|
||||
|
||||
} // End namespace gold.
|
||||
|
178
gold/symtab.cc
178
gold/symtab.cc
@ -666,28 +666,28 @@ Symbol_table::add_from_dynobj(
|
||||
|
||||
// Create and return a specially defined symbol. If ONLY_IF_REF is
|
||||
// true, then only create the symbol if there is a reference to it.
|
||||
// If this does not return NULL, it sets *POLDSYM to the existing
|
||||
// symbol if there is one.
|
||||
|
||||
template<int size, bool big_endian>
|
||||
Sized_symbol<size>*
|
||||
Symbol_table::define_special_symbol(const Target* target, const char* name,
|
||||
const char* version, bool only_if_ref
|
||||
const char* version, bool only_if_ref,
|
||||
Sized_symbol<size>** poldsym
|
||||
ACCEPT_SIZE_ENDIAN)
|
||||
{
|
||||
gold_assert(this->size_ == size);
|
||||
|
||||
Symbol* oldsym;
|
||||
Sized_symbol<size>* sym;
|
||||
bool add_to_table = false;
|
||||
typename Symbol_table_type::iterator add_loc = this->table_.end();
|
||||
|
||||
if (only_if_ref)
|
||||
{
|
||||
oldsym = this->lookup(name, version);
|
||||
if (oldsym == NULL || !oldsym->is_undefined())
|
||||
return NULL;
|
||||
sym = NULL;
|
||||
|
||||
// Canonicalize NAME and VERSION.
|
||||
name = oldsym->name();
|
||||
version = oldsym->version();
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -710,54 +710,39 @@ Symbol_table::define_special_symbol(const Target* target, const char* name,
|
||||
// We already have a symbol table entry for NAME/VERSION.
|
||||
oldsym = ins.first->second;
|
||||
gold_assert(oldsym != NULL);
|
||||
sym = NULL;
|
||||
}
|
||||
else
|
||||
{
|
||||
// We haven't seen this symbol before.
|
||||
gold_assert(ins.first->second == NULL);
|
||||
|
||||
if (!target->has_make_symbol())
|
||||
sym = new Sized_symbol<size>();
|
||||
else
|
||||
{
|
||||
gold_assert(target->get_size() == size);
|
||||
gold_assert(target->is_big_endian() ? big_endian : !big_endian);
|
||||
typedef Sized_target<size, big_endian> My_target;
|
||||
const My_target* sized_target =
|
||||
static_cast<const My_target*>(target);
|
||||
sym = sized_target->make_symbol();
|
||||
if (sym == NULL)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
ins.first->second = sym;
|
||||
add_to_table = true;
|
||||
add_loc = ins.first;
|
||||
oldsym = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
if (oldsym != NULL)
|
||||
if (!target->has_make_symbol())
|
||||
sym = new Sized_symbol<size>();
|
||||
else
|
||||
{
|
||||
gold_assert(sym == NULL);
|
||||
|
||||
sym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym
|
||||
SELECT_SIZE(size));
|
||||
gold_assert(sym->source() == Symbol::FROM_OBJECT);
|
||||
const int old_shndx = sym->shndx();
|
||||
if (old_shndx != elfcpp::SHN_UNDEF
|
||||
&& old_shndx != elfcpp::SHN_COMMON
|
||||
&& !sym->object()->is_dynamic())
|
||||
{
|
||||
fprintf(stderr, "%s: linker defined: multiple definition of %s\n",
|
||||
program_name, name);
|
||||
// FIXME: Report old location. Record that we have seen an
|
||||
// error.
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Our new definition is going to override the old reference.
|
||||
gold_assert(target->get_size() == size);
|
||||
gold_assert(target->is_big_endian() ? big_endian : !big_endian);
|
||||
typedef Sized_target<size, big_endian> My_target;
|
||||
const My_target* sized_target =
|
||||
static_cast<const My_target*>(target);
|
||||
sym = sized_target->make_symbol();
|
||||
if (sym == NULL)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (add_to_table)
|
||||
add_loc->second = sym;
|
||||
else
|
||||
gold_assert(oldsym != NULL);
|
||||
|
||||
*poldsym = this->get_sized_symbol SELECT_SIZE_NAME(size) (oldsym
|
||||
SELECT_SIZE(size));
|
||||
|
||||
return sym;
|
||||
}
|
||||
|
||||
@ -775,15 +760,29 @@ Symbol_table::define_in_output_data(const Target* target, const char* name,
|
||||
{
|
||||
gold_assert(target->get_size() == this->size_);
|
||||
if (this->size_ == 32)
|
||||
return this->do_define_in_output_data<32>(target, name, version, od, value,
|
||||
symsize, type, binding,
|
||||
visibility, nonvis,
|
||||
offset_is_from_end, only_if_ref);
|
||||
{
|
||||
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
|
||||
return this->do_define_in_output_data<32>(target, name, version, od,
|
||||
value, symsize, type, binding,
|
||||
visibility, nonvis,
|
||||
offset_is_from_end,
|
||||
only_if_ref);
|
||||
#else
|
||||
gold_unreachable();
|
||||
#endif
|
||||
}
|
||||
else if (this->size_ == 64)
|
||||
return this->do_define_in_output_data<64>(target, name, version, od, value,
|
||||
symsize, type, binding,
|
||||
visibility, nonvis,
|
||||
offset_is_from_end, only_if_ref);
|
||||
{
|
||||
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
|
||||
return this->do_define_in_output_data<64>(target, name, version, od,
|
||||
value, symsize, type, binding,
|
||||
visibility, nonvis,
|
||||
offset_is_from_end,
|
||||
only_if_ref);
|
||||
#else
|
||||
gold_unreachable();
|
||||
#endif
|
||||
}
|
||||
else
|
||||
gold_unreachable();
|
||||
}
|
||||
@ -807,12 +806,13 @@ Symbol_table::do_define_in_output_data(
|
||||
bool only_if_ref)
|
||||
{
|
||||
Sized_symbol<size>* sym;
|
||||
Sized_symbol<size>* oldsym;
|
||||
|
||||
if (target->is_big_endian())
|
||||
{
|
||||
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
|
||||
sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
|
||||
target, name, version, only_if_ref
|
||||
target, name, version, only_if_ref, &oldsym
|
||||
SELECT_SIZE_ENDIAN(size, true));
|
||||
#else
|
||||
gold_unreachable();
|
||||
@ -822,7 +822,7 @@ Symbol_table::do_define_in_output_data(
|
||||
{
|
||||
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
|
||||
sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
|
||||
target, name, version, only_if_ref
|
||||
target, name, version, only_if_ref, &oldsym
|
||||
SELECT_SIZE_ENDIAN(size, false));
|
||||
#else
|
||||
gold_unreachable();
|
||||
@ -835,6 +835,10 @@ Symbol_table::do_define_in_output_data(
|
||||
sym->init(name, od, value, symsize, type, binding, visibility, nonvis,
|
||||
offset_is_from_end);
|
||||
|
||||
if (oldsym != NULL
|
||||
&& Symbol_table::should_override_with_special(oldsym))
|
||||
oldsym->override_with_special(sym);
|
||||
|
||||
return sym;
|
||||
}
|
||||
|
||||
@ -852,15 +856,27 @@ Symbol_table::define_in_output_segment(const Target* target, const char* name,
|
||||
{
|
||||
gold_assert(target->get_size() == this->size_);
|
||||
if (this->size_ == 32)
|
||||
return this->do_define_in_output_segment<32>(target, name, version, os,
|
||||
value, symsize, type, binding,
|
||||
visibility, nonvis,
|
||||
offset_base, only_if_ref);
|
||||
{
|
||||
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
|
||||
return this->do_define_in_output_segment<32>(target, name, version, os,
|
||||
value, symsize, type,
|
||||
binding, visibility, nonvis,
|
||||
offset_base, only_if_ref);
|
||||
#else
|
||||
gold_unreachable();
|
||||
#endif
|
||||
}
|
||||
else if (this->size_ == 64)
|
||||
return this->do_define_in_output_segment<64>(target, name, version, os,
|
||||
value, symsize, type, binding,
|
||||
visibility, nonvis,
|
||||
offset_base, only_if_ref);
|
||||
{
|
||||
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
|
||||
return this->do_define_in_output_segment<64>(target, name, version, os,
|
||||
value, symsize, type,
|
||||
binding, visibility, nonvis,
|
||||
offset_base, only_if_ref);
|
||||
#else
|
||||
gold_unreachable();
|
||||
#endif
|
||||
}
|
||||
else
|
||||
gold_unreachable();
|
||||
}
|
||||
@ -884,14 +900,15 @@ Symbol_table::do_define_in_output_segment(
|
||||
bool only_if_ref)
|
||||
{
|
||||
Sized_symbol<size>* sym;
|
||||
Sized_symbol<size>* oldsym;
|
||||
|
||||
if (target->is_big_endian())
|
||||
sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
|
||||
target, name, version, only_if_ref
|
||||
target, name, version, only_if_ref, &oldsym
|
||||
SELECT_SIZE_ENDIAN(size, true));
|
||||
else
|
||||
sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
|
||||
target, name, version, only_if_ref
|
||||
target, name, version, only_if_ref, &oldsym
|
||||
SELECT_SIZE_ENDIAN(size, false));
|
||||
|
||||
if (sym == NULL)
|
||||
@ -900,6 +917,10 @@ Symbol_table::do_define_in_output_segment(
|
||||
sym->init(name, os, value, symsize, type, binding, visibility, nonvis,
|
||||
offset_base);
|
||||
|
||||
if (oldsym != NULL
|
||||
&& Symbol_table::should_override_with_special(oldsym))
|
||||
oldsym->override_with_special(sym);
|
||||
|
||||
return sym;
|
||||
}
|
||||
|
||||
@ -915,13 +936,25 @@ Symbol_table::define_as_constant(const Target* target, const char* name,
|
||||
{
|
||||
gold_assert(target->get_size() == this->size_);
|
||||
if (this->size_ == 32)
|
||||
return this->do_define_as_constant<32>(target, name, version, value,
|
||||
symsize, type, binding, visibility,
|
||||
nonvis, only_if_ref);
|
||||
{
|
||||
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
|
||||
return this->do_define_as_constant<32>(target, name, version, value,
|
||||
symsize, type, binding,
|
||||
visibility, nonvis, only_if_ref);
|
||||
#else
|
||||
gold_unreachable();
|
||||
#endif
|
||||
}
|
||||
else if (this->size_ == 64)
|
||||
return this->do_define_as_constant<64>(target, name, version, value,
|
||||
symsize, type, binding, visibility,
|
||||
nonvis, only_if_ref);
|
||||
{
|
||||
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
|
||||
return this->do_define_as_constant<64>(target, name, version, value,
|
||||
symsize, type, binding,
|
||||
visibility, nonvis, only_if_ref);
|
||||
#else
|
||||
gold_unreachable();
|
||||
#endif
|
||||
}
|
||||
else
|
||||
gold_unreachable();
|
||||
}
|
||||
@ -943,14 +976,15 @@ Symbol_table::do_define_as_constant(
|
||||
bool only_if_ref)
|
||||
{
|
||||
Sized_symbol<size>* sym;
|
||||
Sized_symbol<size>* oldsym;
|
||||
|
||||
if (target->is_big_endian())
|
||||
sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, true) (
|
||||
target, name, version, only_if_ref
|
||||
target, name, version, only_if_ref, &oldsym
|
||||
SELECT_SIZE_ENDIAN(size, true));
|
||||
else
|
||||
sym = this->define_special_symbol SELECT_SIZE_ENDIAN_NAME(size, false) (
|
||||
target, name, version, only_if_ref
|
||||
target, name, version, only_if_ref, &oldsym
|
||||
SELECT_SIZE_ENDIAN(size, false));
|
||||
|
||||
if (sym == NULL)
|
||||
@ -958,6 +992,10 @@ Symbol_table::do_define_as_constant(
|
||||
|
||||
sym->init(name, value, symsize, type, binding, visibility, nonvis);
|
||||
|
||||
if (oldsym != NULL
|
||||
&& Symbol_table::should_override_with_special(oldsym))
|
||||
oldsym->override_with_special(sym);
|
||||
|
||||
return sym;
|
||||
}
|
||||
|
||||
|
@ -404,6 +404,10 @@ class Symbol
|
||||
override_base(const elfcpp::Sym<size, big_endian>&, Object* object,
|
||||
const char* version);
|
||||
|
||||
// Override existing symbol with a special symbol.
|
||||
void
|
||||
override_base_with_special(const Symbol* from);
|
||||
|
||||
private:
|
||||
Symbol(const Symbol&);
|
||||
Symbol& operator=(const Symbol&);
|
||||
@ -549,6 +553,10 @@ class Sized_symbol : public Symbol
|
||||
override(const elfcpp::Sym<size, big_endian>&, Object* object,
|
||||
const char* version);
|
||||
|
||||
// Override existing symbol with a special symbol.
|
||||
void
|
||||
override_with_special(const Sized_symbol<size>*);
|
||||
|
||||
// Return the symbol's value.
|
||||
Value_type
|
||||
value() const
|
||||
@ -905,12 +913,22 @@ class Symbol_table
|
||||
resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from,
|
||||
const char* version ACCEPT_SIZE_ENDIAN);
|
||||
|
||||
// Whether we should override a symbol, based on flags in
|
||||
// resolve.cc.
|
||||
static bool
|
||||
should_override(const Symbol*, unsigned int, bool*);
|
||||
|
||||
// Whether we should override a symbol with a special symbol which
|
||||
// is automatically defined by the linker.
|
||||
static bool
|
||||
should_override_with_special(const Symbol*);
|
||||
|
||||
// Define a special symbol.
|
||||
template<int size, bool big_endian>
|
||||
Sized_symbol<size>*
|
||||
define_special_symbol(const Target* target, const char* name,
|
||||
const char* version, bool only_if_ref
|
||||
ACCEPT_SIZE_ENDIAN);
|
||||
const char* version, bool only_if_ref,
|
||||
Sized_symbol<size>** poldsym ACCEPT_SIZE_ENDIAN);
|
||||
|
||||
// Define a symbol in an Output_data, sized version.
|
||||
template<int size>
|
||||
|
Loading…
Reference in New Issue
Block a user