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1 | // target-select.h -- select a target for an object file -*- C++ -*- |
2 | ||
ebdbb458 | 3 | // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. |
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4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
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23 | #ifndef GOLD_TARGET_SELECT_H |
24 | #define GOLD_TARGET_SELECT_H | |
25 | ||
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26 | #include <vector> |
27 | ||
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28 | namespace gold |
29 | { | |
30 | ||
31 | class Target; | |
32 | ||
33 | // We want to avoid a master list of targets, which implies using a | |
34 | // global constructor. And we also want the program to start up as | |
35 | // quickly as possible, which implies avoiding global constructors. | |
36 | // We compromise on a very simple global constructor. We use a target | |
37 | // selector, which specifies an ELF machine number and a recognition | |
38 | // function. We use global constructors to build a linked list of | |
39 | // target selectors--a simple pointer list, not a std::list. | |
40 | ||
41 | class Target_selector | |
42 | { | |
43 | public: | |
44 | // Create a target selector for a specific machine number, size (32 | |
45 | // or 64), and endianness. The machine number can be EM_NONE to | |
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46 | // test for any machine number. BFD_NAME is the name of the target |
47 | // used by the GNU linker, for backward compatibility; it may be | |
48 | // NULL. | |
49 | Target_selector(int machine, int size, bool is_big_endian, | |
50 | const char* bfd_name); | |
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51 | |
52 | virtual ~Target_selector() | |
53 | { } | |
54 | ||
55 | // If we can handle this target, return a pointer to a target | |
56 | // structure. The size and endianness are known. | |
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57 | Target* |
58 | recognize(int machine, int osabi, int abiversion) | |
59 | { return this->do_recognize(machine, osabi, abiversion); } | |
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60 | |
61 | // If NAME matches the target, return a pointer to a target | |
62 | // structure. | |
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63 | Target* |
64 | recognize_by_name(const char* name) | |
65 | { return this->do_recognize_by_name(name); } | |
66 | ||
67 | // Push all supported names onto the vector. This is only used for | |
68 | // help output. | |
69 | void | |
70 | supported_names(std::vector<const char*>* names) | |
71 | { this->do_supported_names(names); } | |
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72 | |
73 | // Return the next Target_selector in the linked list. | |
74 | Target_selector* | |
75 | next() const | |
76 | { return this->next_; } | |
77 | ||
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78 | // Return the machine number this selector is looking for. This can |
79 | // be EM_NONE to match any machine number, in which case the | |
80 | // do_recognize hook will be responsible for matching the machine | |
81 | // number. | |
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82 | int |
83 | machine() const | |
84 | { return this->machine_; } | |
85 | ||
86 | // Return the size this is looking for (32 or 64). | |
87 | int | |
6340166c | 88 | get_size() const |
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89 | { return this->size_; } |
90 | ||
91 | // Return the endianness this is looking for. | |
92 | bool | |
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93 | is_big_endian() const |
94 | { return this->is_big_endian_; } | |
14bfc3f5 | 95 | |
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96 | // Return the BFD name. This may return NULL, in which case the |
97 | // do_recognize_by_name hook will be responsible for matching the | |
98 | // BFD name. | |
99 | const char* | |
100 | bfd_name() const | |
101 | { return this->bfd_name_; } | |
102 | ||
103 | protected: | |
104 | // Return an instance of the real target. This must be implemented | |
105 | // by the child class. | |
106 | virtual Target* | |
107 | do_instantiate_target() = 0; | |
108 | ||
109 | // Recognize an object file given a machine code, size, and | |
110 | // endianness. When this is called we already know that they match | |
111 | // the machine_, size_, and is_big_endian_ fields. The child class | |
112 | // may implement a different version of this to do additional | |
113 | // checks, or to check for multiple machine codes if the machine_ | |
114 | // field is EM_NONE. | |
115 | virtual Target* | |
116 | do_recognize(int, int, int) | |
117 | { return this->instantiate_target(); } | |
118 | ||
119 | // Recognize a target by name. When this is called we already know | |
120 | // that the name matches (or that the bfd_name_ field is NULL). The | |
121 | // child class may implement a different version of this to | |
122 | // recognize more than one name. | |
123 | virtual Target* | |
124 | do_recognize_by_name(const char*) | |
125 | { return this->instantiate_target(); } | |
126 | ||
127 | // Return a list of supported BFD names. The child class may | |
128 | // implement a different version of this to handle more than one | |
129 | // name. | |
130 | virtual void | |
131 | do_supported_names(std::vector<const char*>* names) | |
132 | { | |
133 | gold_assert(this->bfd_name_ != NULL); | |
134 | names->push_back(this->bfd_name_); | |
135 | } | |
136 | ||
14bfc3f5 | 137 | private: |
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138 | // Instantiate the target and return it. |
139 | Target* | |
140 | instantiate_target() | |
141 | { | |
142 | if (this->instantiated_target_ == NULL) | |
143 | this->instantiated_target_ = this->do_instantiate_target(); | |
144 | return this->instantiated_target_; | |
145 | } | |
146 | ||
147 | // ELF machine code. | |
148 | const int machine_; | |
149 | // Target size--32 or 64. | |
150 | const int size_; | |
151 | // Whether the target is big endian. | |
152 | const bool is_big_endian_; | |
153 | // BFD name of target, for compatibility. | |
154 | const char* const bfd_name_; | |
155 | // Next entry in list built at global constructor time. | |
14bfc3f5 | 156 | Target_selector* next_; |
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157 | // The singleton Target structure--this points to an instance of the |
158 | // real implementation. | |
159 | Target* instantiated_target_; | |
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160 | }; |
161 | ||
162 | // Select the target for an ELF file. | |
163 | ||
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164 | extern Target* |
165 | select_target(int machine, int size, bool big_endian, int osabi, | |
166 | int abiversion); | |
14bfc3f5 | 167 | |
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168 | // Select a target using a BFD name. |
169 | ||
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170 | extern Target* |
171 | select_target_by_name(const char* name); | |
172 | ||
173 | // Fill in a vector with the list of supported targets. This returns | |
174 | // a list of BFD names. | |
175 | ||
176 | extern void | |
177 | supported_target_names(std::vector<const char*>*); | |
0daa6f62 | 178 | |
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179 | } // End namespace gold. |
180 | ||
181 | #endif // !defined(GOLD_TARGET_SELECT_H) |