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