1 // target-select.cc -- select a target for an object file
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 // Free Software Foundation, Inc.
5 // Written by Ian Lance Taylor <iant@google.com>.
7 // This file is part of gold.
9 // This program is free software; you can redistribute it and/or modify
10 // it under the terms of the GNU General Public License as published by
11 // the Free Software Foundation; either version 3 of the License, or
12 // (at your option) any later version.
14 // This program is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 // MA 02110-1301, USA.
31 #include "parameters.h"
32 #include "target-select.h"
37 // The start of the list of target selectors.
39 gold::Target_selector
* target_selectors
;
41 } // End anonymous namespace.
46 // Class Set_target_once.
49 Set_target_once::do_run_once(void*)
51 this->target_selector_
->set_target();
54 // Construct a Target_selector, which means adding it to the linked
55 // list. This runs at global constructor time, so we want it to be
58 Target_selector::Target_selector(int machine
, int size
, bool is_big_endian
,
59 const char* bfd_name
, const char* emulation
)
60 : machine_(machine
), size_(size
), is_big_endian_(is_big_endian
),
61 bfd_name_(bfd_name
), emulation_(emulation
), instantiated_target_(NULL
),
62 set_target_once_(this)
64 this->next_
= target_selectors
;
65 target_selectors
= this;
68 // Instantiate the target and return it. Use SET_TARGET_ONCE_ to
69 // avoid instantiating two instances of the same target.
72 Target_selector::instantiate_target()
74 this->set_target_once_
.run_once(NULL
);
75 return this->instantiated_target_
;
78 // Instantiate the target. This is called at most once.
81 Target_selector::set_target()
83 gold_assert(this->instantiated_target_
== NULL
);
84 this->instantiated_target_
= this->do_instantiate_target();
87 // If we instantiated TARGET, return the corresponding BFD name.
90 Target_selector::do_target_bfd_name(const Target
* target
)
92 if (!this->is_our_target(target
))
94 const char* my_bfd_name
= this->bfd_name();
95 gold_assert(my_bfd_name
!= NULL
);
99 // Find the target for an ELF file.
102 select_target(Input_file
* input_file
, off_t offset
,
103 int machine
, int size
, bool is_big_endian
,
104 int osabi
, int abiversion
)
106 for (Target_selector
* p
= target_selectors
; p
!= NULL
; p
= p
->next())
108 int pmach
= p
->machine();
109 if ((pmach
== machine
|| pmach
== elfcpp::EM_NONE
)
110 && p
->get_size() == size
111 && (p
->is_big_endian() ? is_big_endian
: !is_big_endian
))
113 Target
* ret
= p
->recognize(input_file
, offset
,
114 machine
, osabi
, abiversion
);
122 // Find a target using a BFD name. This is used to support the
126 select_target_by_bfd_name(const char* name
)
128 for (Target_selector
* p
= target_selectors
; p
!= NULL
; p
= p
->next())
130 const char* pname
= p
->bfd_name();
131 if (pname
== NULL
|| strcmp(pname
, name
) == 0)
133 Target
* ret
= p
->recognize_by_bfd_name(name
);
141 // Find a target using a GNU linker emulation. This is used to
142 // support the -m option.
145 select_target_by_emulation(const char* name
)
147 for (Target_selector
* p
= target_selectors
; p
!= NULL
; p
= p
->next())
149 const char* pname
= p
->emulation();
150 if (pname
== NULL
|| strcmp(pname
, name
) == 0)
152 Target
* ret
= p
->recognize_by_emulation(name
);
160 // Push all the supported BFD names onto a vector.
163 supported_target_names(std::vector
<const char*>* names
)
165 for (Target_selector
* p
= target_selectors
; p
!= NULL
; p
= p
->next())
166 p
->supported_bfd_names(names
);
169 // Push all the supported emulations onto a vector.
172 supported_emulation_names(std::vector
<const char*>* names
)
174 for (Target_selector
* p
= target_selectors
; p
!= NULL
; p
= p
->next())
175 p
->supported_emulations(names
);
178 // Implement the --print-output-format option.
181 print_output_format()
183 if (!parameters
->target_valid())
185 // This case arises when --print-output-format is used with no
186 // input files. We need to come up with the right string to
187 // print based on the other options. If the user specified the
188 // format using a --oformat option, use that. That saves each
189 // target from having to remember the name that was used to
190 // select it. In other cases, we will just have to ask the
192 if (parameters
->options().user_set_oformat())
194 const char* bfd_name
= parameters
->options().oformat();
195 Target
* target
= select_target_by_bfd_name(bfd_name
);
197 printf("%s\n", bfd_name
);
199 gold_error(_("unrecognized output format %s"), bfd_name
);
203 parameters_force_valid_target();
206 const Target
* target
= ¶meters
->target();
207 for (Target_selector
* p
= target_selectors
; p
!= NULL
; p
= p
->next())
209 const char* bfd_name
= p
->target_bfd_name(target
);
210 if (bfd_name
!= NULL
)
212 printf("%s\n", bfd_name
);
220 } // End namespace gold.
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