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// target-select.h -- select a target for an object file -*- C++ -*-
#ifndef GOLD_TARGET_SELECT_H
#define GOLD_TARGET_SELECT_H
namespace gold
{
class Target;
// We want to avoid a master list of targets, which implies using a
// global constructor. And we also want the program to start up as
// quickly as possible, which implies avoiding global constructors.
// We compromise on a very simple global constructor. We use a target
// selector, which specifies an ELF machine number and a recognition
// function. We use global constructors to build a linked list of
// target selectors--a simple pointer list, not a std::list.
class Target_selector
{
public:
// Create a target selector for a specific machine number, size (32
// or 64), and endianness. The machine number can be EM_NONE to
// test for any machine number.
Target_selector(int machine, int size, bool big_endian);
virtual ~Target_selector()
{ }
// If we can handle this target, return a pointer to a target
// structure. The size and endianness are known.
virtual Target* recognize(int machine, int osabi, int abiversion) const = 0;
// Return the next Target_selector in the linked list.
Target_selector*
next() const
{ return this->next_; }
// Return the machine number this selector is looking for, which can
// be EM_NONE to match any machine number.
int
machine() const
{ return this->machine_; }
// Return the size this is looking for (32 or 64).
int
size() const
{ return this->size_; }
// Return the endianness this is looking for.
bool
big_endian() const
{ return this->big_endian_; }
private:
int machine_;
int size_;
bool big_endian_;
Target_selector* next_;
};
// Select the target for an ELF file.
extern Target* select_target(int machine, int size, bool big_endian,
int osabi, int abiversion);
} // End namespace gold.
#endif // !defined(GOLD_TARGET_SELECT_H)
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