1 files changed, 69 insertions, 0 deletions
diff --git a/gold/target-select.h b/gold/target-select.h
new file mode 100644
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+++ b/gold/target-select.h
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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) = 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)