// target-select.h -- select a target for an object file -*- C++ -*-
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#ifndef GOLD_TARGET_SELECT_H
#define GOLD_TARGET_SELECT_H
+#include <vector>
+
+#include "gold-threads.h"
+
namespace gold
{
+class Input_file;
class Target;
+class Target_selector;
+
+// Used to set the target only once.
+
+class Set_target_once : public Once
+{
+ public:
+ Set_target_once(Target_selector* target_selector)
+ : target_selector_(target_selector)
+ { }
+
+ protected:
+ void
+ do_run_once(void*);
+
+ private:
+ Target_selector* target_selector_;
+};
// 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
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);
+ // test for any machine number. BFD_NAME is the name of the target
+ // used by the GNU linker, for backward compatibility; it may be
+ // NULL. EMULATION is the name of the emulation used by the GNU
+ // linker; it is similar to BFD_NAME.
+ Target_selector(int machine, int size, bool is_big_endian,
+ const char* bfd_name, const char* emulation);
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;
+ Target*
+ recognize(Input_file* input_file, off_t offset,
+ int machine, int osabi, int abiversion)
+ { return this->do_recognize(input_file, offset, machine, osabi, abiversion); }
+
+ // If NAME matches the target, return a pointer to a target
+ // structure.
+ Target*
+ recognize_by_bfd_name(const char* name)
+ { return this->do_recognize_by_bfd_name(name); }
+
+ // Push all supported BFD names onto the vector. This is only used
+ // for help output.
+ void
+ supported_bfd_names(std::vector<const char*>* names)
+ { this->do_supported_bfd_names(names); }
+
+ // If NAME matches the target emulation, return a pointer to a
+ // target structure.
+ Target*
+ recognize_by_emulation(const char* name)
+ { return this->do_recognize_by_emulation(name); }
+
+ // Push all supported emulations onto the vector. This is only used
+ // for help output.
+ void
+ supported_emulations(std::vector<const char*>* names)
+ { this->do_supported_emulations(names); }
// 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.
+ // Return the machine number this selector is looking for. This can
+ // be EM_NONE to match any machine number, in which case the
+ // do_recognize hook will be responsible for matching the machine
+ // number.
int
machine() const
{ return this->machine_; }
// Return the size this is looking for (32 or 64).
int
- size() const
+ get_size() const
{ return this->size_; }
// Return the endianness this is looking for.
bool
- big_endian() const
- { return this->big_endian_; }
+ is_big_endian() const
+ { return this->is_big_endian_; }
+
+ // Return the BFD name. This may return NULL, in which case the
+ // do_recognize_by_bfd_name hook will be responsible for matching
+ // the BFD name.
+ const char*
+ bfd_name() const
+ { return this->bfd_name_; }
+
+ // Return the emulation. This may return NULL, in which case the
+ // do_recognize_by_emulation hook will be responsible for matching
+ // the emulation.
+ const char*
+ emulation() const
+ { return this->emulation_; }
+
+ // The reverse mapping, for --print-output-format: if we
+ // instantiated TARGET, return our BFD_NAME. If we did not
+ // instantiate it, return NULL.
+ const char*
+ target_bfd_name(const Target* target)
+ { return this->do_target_bfd_name(target); }
+
+ protected:
+ // Return an instance of the real target. This must be implemented
+ // by the child class.
+ virtual Target*
+ do_instantiate_target() = 0;
+
+ // Recognize an object file given a machine code, OSABI code, and
+ // ELF version value. When this is called we already know that they
+ // match the machine_, size_, and is_big_endian_ fields. The child
+ // class may implement a different version of this to do additional
+ // checks, or to check for multiple machine codes if the machine_
+ // field is EM_NONE.
+ virtual Target*
+ do_recognize(Input_file*, off_t, int, int, int)
+ { return this->instantiate_target(); }
+
+ // Recognize a target by name. When this is called we already know
+ // that the name matches (or that the bfd_name_ field is NULL). The
+ // child class may implement a different version of this to
+ // recognize more than one name.
+ virtual Target*
+ do_recognize_by_bfd_name(const char*)
+ { return this->instantiate_target(); }
+
+ // Return a list of supported BFD names. The child class may
+ // implement a different version of this to handle more than one
+ // name.
+ virtual void
+ do_supported_bfd_names(std::vector<const char*>* names)
+ {
+ gold_assert(this->bfd_name_ != NULL);
+ names->push_back(this->bfd_name_);
+ }
+
+ // Recognize a target by emulation. When this is called we already
+ // know that the name matches (or that the emulation_ field is
+ // NULL). The child class may implement a different version of this
+ // to recognize more than one emulation.
+ virtual Target*
+ do_recognize_by_emulation(const char*)
+ { return this->instantiate_target(); }
+
+ // Return a list of supported emulations. The child class may
+ // implement a different version of this to handle more than one
+ // emulation.
+ virtual void
+ do_supported_emulations(std::vector<const char*>* emulations)
+ {
+ gold_assert(this->emulation_ != NULL);
+ emulations->push_back(this->emulation_);
+ }
+
+ // Map from target to BFD name.
+ virtual const char*
+ do_target_bfd_name(const Target*);
+
+ // Instantiate the target and return it.
+ Target*
+ instantiate_target();
+
+ // Return whether TARGET is the target we instantiated.
+ bool
+ is_our_target(const Target* target)
+ { return target == this->instantiated_target_; }
private:
- int machine_;
- int size_;
- bool big_endian_;
+ // Set the target.
+ void
+ set_target();
+
+ friend class Set_target_once;
+
+ // ELF machine code.
+ const int machine_;
+ // Target size--32 or 64.
+ const int size_;
+ // Whether the target is big endian.
+ const bool is_big_endian_;
+ // BFD name of target, for compatibility.
+ const char* const bfd_name_;
+ // GNU linker emulation for this target, for compatibility.
+ const char* const emulation_;
+ // Next entry in list built at global constructor time.
Target_selector* next_;
+ // The singleton Target structure--this points to an instance of the
+ // real implementation.
+ Target* instantiated_target_;
+ // Used to set the target only once.
+ Set_target_once set_target_once_;
};
// Select the target for an ELF file.
-extern Target* select_target(int machine, int size, bool big_endian,
- int osabi, int abiversion);
+extern Target*
+select_target(Input_file*, off_t,
+ int machine, int size, bool big_endian, int osabi,
+ int abiversion);
+
+// Select a target using a BFD name.
+
+extern Target*
+select_target_by_bfd_name(const char* name);
+
+// Select a target using a GNU linker emulation.
+
+extern Target*
+select_target_by_emulation(const char* name);
+
+// Fill in a vector with the list of supported targets. This returns
+// a list of BFD names.
+
+extern void
+supported_target_names(std::vector<const char*>*);
+
+// Fill in a vector with the list of supported emulations.
+
+extern void
+supported_emulation_names(std::vector<const char*>*);
+
+// Print the output format, for the --print-output-format option.
+
+extern void
+print_output_format();
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff