// symtab.h -- the gold symbol table -*- C++ -*-
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
needs_dynsym_entry() const
{
return (this->needs_dynsym_entry_
- || (this->in_reg() && this->in_dyn()));
+ || (this->in_reg()
+ && this->in_dyn()
+ && this->is_externally_visible()));
}
// Mark this symbol as needing an entry in the dynamic symbol table.
set_in_real_elf()
{ this->in_real_elf_ = true; }
+ // Return whether this symbol was defined in a section that was
+ // discarded from the link. This is used to control some error
+ // reporting.
+ bool
+ is_defined_in_discarded_section() const
+ { return this->is_defined_in_discarded_section_; }
+
+ // Mark this symbol as having been defined in a discarded section.
+ void
+ set_is_defined_in_discarded_section()
+ { this->is_defined_in_discarded_section_ = true; }
+
// Return the index of this symbol in the output file symbol table.
// A value of -1U means that this symbol is not going into the
// output file. This starts out as zero, and is set to a non-zero
// Return whether this symbol has an entry in the PLT section.
bool
has_plt_offset() const
- { return this->has_plt_offset_; }
+ { return this->plt_offset_ != -1U; }
// Return the offset into the PLT section of this symbol.
unsigned int
void
set_plt_offset(unsigned int plt_offset)
{
- this->has_plt_offset_ = true;
+ gold_assert(plt_offset != -1U);
this->plt_offset_ = plt_offset;
}
bool
is_common() const
{
- if (this->type_ == elfcpp::STT_COMMON)
- return true;
if (this->source_ != FROM_OBJECT)
return false;
+ if (this->type_ == elfcpp::STT_COMMON)
+ return true;
bool is_ordinary;
unsigned int shndx = this->shndx(&is_ordinary);
return !is_ordinary && Symbol::is_common_shndx(shndx);
// non-zero value during Layout::finalize.
unsigned int dynsym_index_;
- // If this symbol has an entry in the GOT section (has_got_offset_
- // is true), this holds the offset from the start of the GOT section.
- // A symbol may have more than one GOT offset (e.g., when mixing
- // modules compiled with two different TLS models), but will usually
- // have at most one.
+ // The GOT section entries for this symbol. A symbol may have more
+ // than one GOT offset (e.g., when mixing modules compiled with two
+ // different TLS models), but will usually have at most one.
Got_offset_list got_offsets_;
- // If this symbol has an entry in the PLT section (has_plt_offset_
- // is true), then this is the offset from the start of the PLT
- // section.
+ // If this symbol has an entry in the PLT section, then this is the
+ // offset from the start of the PLT section. This is -1U if there
+ // is no PLT entry.
unsigned int plt_offset_;
// Symbol type (bits 0 to 3).
unsigned int nonvis_ : 6;
// The type of symbol (bits 16 to 18).
Source source_ : 3;
- // True if this symbol always requires special target-specific
- // handling (bit 19).
- bool is_target_special_ : 1;
- // True if this is the default version of the symbol (bit 20).
+ // True if this is the default version of the symbol (bit 19).
bool is_def_ : 1;
// True if this symbol really forwards to another symbol. This is
// used when we discover after the fact that two different entries
// never be set for a symbol found in the hash table, but may be set
// for a symbol found in the list of symbols attached to an Object.
// It forwards to the symbol found in the forwarders_ map of
- // Symbol_table (bit 21).
+ // Symbol_table (bit 20).
bool is_forwarder_ : 1;
// True if the symbol has an alias in the weak_aliases table in
- // Symbol_table (bit 22).
+ // Symbol_table (bit 21).
bool has_alias_ : 1;
// True if this symbol needs to be in the dynamic symbol table (bit
- // 23).
+ // 22).
bool needs_dynsym_entry_ : 1;
- // True if we've seen this symbol in a regular object (bit 24).
+ // True if we've seen this symbol in a regular object (bit 23).
bool in_reg_ : 1;
- // True if we've seen this symbol in a dynamic object (bit 25).
+ // True if we've seen this symbol in a dynamic object (bit 24).
bool in_dyn_ : 1;
- // True if the symbol has an entry in the PLT section (bit 26).
- bool has_plt_offset_ : 1;
// True if this is a dynamic symbol which needs a special value in
- // the dynamic symbol table (bit 27).
+ // the dynamic symbol table (bit 25).
bool needs_dynsym_value_ : 1;
- // True if there is a warning for this symbol (bit 28).
+ // True if there is a warning for this symbol (bit 26).
bool has_warning_ : 1;
// True if we are using a COPY reloc for this symbol, so that the
- // real definition lives in a dynamic object (bit 29).
+ // real definition lives in a dynamic object (bit 27).
bool is_copied_from_dynobj_ : 1;
// True if this symbol was forced to local visibility by a version
- // script (bit 30).
+ // script (bit 28).
bool is_forced_local_ : 1;
// True if the field u_.from_object.shndx is an ordinary section
// index, not one of the special codes from SHN_LORESERVE to
- // SHN_HIRESERVE (bit 31).
+ // SHN_HIRESERVE (bit 29).
bool is_ordinary_shndx_ : 1;
- // True if we've seen this symbol in a real ELF object.
+ // True if we've seen this symbol in a real ELF object (bit 30).
bool in_real_elf_ : 1;
+ // True if this symbol is defined in a section which was discarded
+ // (bit 31).
+ bool is_defined_in_discarded_section_ : 1;
};
// The parts of a symbol which are size specific. Using a template
class Symbol_table
{
public:
+ // The different places where a symbol definition can come from.
+ enum Defined
+ {
+ // Defined in an object file--the normal case.
+ OBJECT,
+ // Defined for a COPY reloc.
+ COPY,
+ // Defined on the command line using --defsym.
+ DEFSYM,
+ // Defined (so to speak) on the command line using -u.
+ UNDEFINED,
+ // Defined in a linker script.
+ SCRIPT,
+ // Predefined by the linker.
+ PREDEFINED,
+ };
+
+ // The order in which we sort common symbols.
+ enum Sort_commons_order
+ {
+ SORT_COMMONS_BY_SIZE_DESCENDING,
+ SORT_COMMONS_BY_ALIGNMENT_DESCENDING,
+ SORT_COMMONS_BY_ALIGNMENT_ASCENDING
+ };
+
// COUNT is an estimate of how many symbosl will be inserted in the
// symbol table. It's ok to put 0 if you don't know; a correct
// guess will just save some CPU by reducing hashtable resizes.
// Define a special symbol based on an Output_data. It is a
// multiple definition error if this symbol is already defined.
Symbol*
- define_in_output_data(const char* name, const char* version,
+ define_in_output_data(const char* name, const char* version, Defined,
Output_data*, uint64_t value, uint64_t symsize,
elfcpp::STT type, elfcpp::STB binding,
elfcpp::STV visibility, unsigned char nonvis,
// Define a special symbol based on an Output_segment. It is a
// multiple definition error if this symbol is already defined.
Symbol*
- define_in_output_segment(const char* name, const char* version,
+ define_in_output_segment(const char* name, const char* version, Defined,
Output_segment*, uint64_t value, uint64_t symsize,
elfcpp::STT type, elfcpp::STB binding,
elfcpp::STV visibility, unsigned char nonvis,
// Define a special symbol with a constant value. It is a multiple
// definition error if this symbol is already defined.
Symbol*
- define_as_constant(const char* name, const char* version,
+ define_as_constant(const char* name, const char* version, Defined,
uint64_t value, uint64_t symsize, elfcpp::STT type,
elfcpp::STB binding, elfcpp::STV visibility,
unsigned char nonvis, bool only_if_ref,
// Whether we should override a symbol, based on flags in
// resolve.cc.
static bool
- should_override(const Symbol*, unsigned int, Object*, bool*);
+ should_override(const Symbol*, unsigned int, Defined, Object*, bool*);
// Report a problem in symbol resolution.
static void
report_resolve_problem(bool is_error, const char* msg, const Symbol* to,
- Object* object);
+ Defined, Object* object);
// Override a symbol.
template<int size, bool big_endian>
// 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*);
+ should_override_with_special(const Symbol*, Defined);
// Override a symbol with a special symbol.
template<int size>
// Define a symbol in an Output_data, sized version.
template<int size>
Sized_symbol<size>*
- do_define_in_output_data(const char* name, const char* version, Output_data*,
+ do_define_in_output_data(const char* name, const char* version, Defined,
+ Output_data*,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword ssize,
elfcpp::STT type, elfcpp::STB binding,
template<int size>
Sized_symbol<size>*
do_define_in_output_segment(
- const char* name, const char* version, Output_segment* os,
+ const char* name, const char* version, Defined, Output_segment* os,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword ssize,
elfcpp::STT type, elfcpp::STB binding,
template<int size>
Sized_symbol<size>*
do_define_as_constant(
- const char* name, const char* version,
+ const char* name, const char* version, Defined,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_WXword ssize,
elfcpp::STT type, elfcpp::STB binding,
// Allocate the common symbols, sized version.
template<int size>
void
- do_allocate_commons(Layout*, Mapfile*);
+ do_allocate_commons(Layout*, Mapfile*, Sort_commons_order);
// Allocate the common symbols from one list.
template<int size>
void
do_allocate_commons_list(Layout*, Commons_section_type, Commons_type*,
- Mapfile*);
+ Mapfile*, Sort_commons_order);
// Implement detect_odr_violations.
template<int size, bool big_endian>
projects / deliverable / binutils-gdb.git / blobdiff