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bb04269c DK |
1 | // target.cc |
2 | ||
3 | // Copyright 2009 Free Software Foundation, Inc. | |
4 | // Written by Doug Kwan <dougkwan@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 | ||
23 | #include "gold.h" | |
24 | #include "target.h" | |
f733487b | 25 | #include "dynobj.h" |
bb04269c DK |
26 | |
27 | namespace gold | |
28 | { | |
29 | ||
30 | // Return whether NAME is a local label name. This is used to implement the | |
31 | // --discard-locals options and can be overriden by children classes to | |
32 | // implement system-specific behaviour. The logic here is the same as that | |
33 | // in _bfd_elf_is_local_label_name(). | |
34 | ||
35 | bool | |
36 | Target::do_is_local_label_name (const char* name) const | |
37 | { | |
38 | // Normal local symbols start with ``.L''. | |
39 | if (name[0] == '.' && name[1] == 'L') | |
40 | return true; | |
41 | ||
42 | // At least some SVR4 compilers (e.g., UnixWare 2.1 cc) generate | |
43 | // DWARF debugging symbols starting with ``..''. | |
44 | if (name[0] == '.' && name[1] == '.') | |
45 | return true; | |
46 | ||
47 | // gcc will sometimes generate symbols beginning with ``_.L_'' when | |
48 | // emitting DWARF debugging output. I suspect this is actually a | |
49 | // small bug in gcc (it calls ASM_OUTPUT_LABEL when it should call | |
50 | // ASM_GENERATE_INTERNAL_LABEL, and this causes the leading | |
51 | // underscore to be emitted on some ELF targets). For ease of use, | |
52 | // we treat such symbols as local. | |
53 | if (name[0] == '_' && name[1] == '.' && name[2] == 'L' && name[3] == '_') | |
54 | return true; | |
55 | ||
56 | return false; | |
57 | } | |
58 | ||
f733487b DK |
59 | // Implementations of methods Target::do_make_elf_object are almost identical |
60 | // except for the address sizes and endianities. So we extract this | |
61 | // into a template. | |
62 | ||
63 | template<int size, bool big_endian> | |
64 | inline Object* | |
65 | Target::do_make_elf_object_implementation( | |
66 | const std::string& name, | |
67 | Input_file* input_file, | |
68 | off_t offset, | |
69 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
70 | { | |
71 | int et = ehdr.get_e_type(); | |
72 | if (et == elfcpp::ET_REL) | |
73 | { | |
74 | Sized_relobj<size, big_endian>* obj = | |
75 | new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
76 | obj->setup(this); | |
77 | return obj; | |
78 | } | |
79 | else if (et == elfcpp::ET_DYN) | |
80 | { | |
81 | Sized_dynobj<size, big_endian>* obj = | |
82 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); | |
83 | obj->setup(this); | |
84 | return obj; | |
85 | } | |
86 | else | |
87 | { | |
88 | gold_error(_("%s: unsupported ELF file type %d"), | |
89 | name.c_str(), et); | |
90 | return NULL; | |
91 | } | |
92 | } | |
93 | ||
94 | // Make an ELF object called NAME by reading INPUT_FILE at OFFSET. EHDR | |
95 | // is the ELF header of the object. There are four versions of this | |
96 | // for different address sizes and endianities. | |
97 | ||
98 | #ifdef HAVE_TARGET_32_LITTLE | |
99 | Object* | |
100 | Target::do_make_elf_object(const std::string& name, Input_file* input_file, | |
101 | off_t offset, const elfcpp::Ehdr<32, false>& ehdr) | |
102 | { | |
103 | return this->do_make_elf_object_implementation<32, false>(name, input_file, | |
104 | offset, ehdr); | |
105 | } | |
106 | #endif | |
107 | ||
108 | #ifdef HAVE_TARGET_32_BIG | |
109 | Object* | |
110 | Target::do_make_elf_object(const std::string& name, Input_file* input_file, | |
111 | off_t offset, const elfcpp::Ehdr<32, true>& ehdr) | |
112 | { | |
113 | return this->do_make_elf_object_implementation<32, true>(name, input_file, | |
114 | offset, ehdr); | |
115 | } | |
116 | #endif | |
117 | ||
118 | #ifdef HAVE_TARGET_64_LITTLE | |
119 | Object* | |
120 | Target::do_make_elf_object(const std::string& name, Input_file* input_file, | |
121 | off_t offset, const elfcpp::Ehdr<64, false>& ehdr) | |
122 | { | |
123 | return this->do_make_elf_object_implementation<64, false>(name, input_file, | |
124 | offset, ehdr); | |
125 | } | |
126 | #endif | |
127 | ||
128 | #ifdef HAVE_TARGET_64_BIG | |
129 | Object* | |
130 | Target::do_make_elf_object(const std::string& name, Input_file* input_file, | |
131 | off_t offset, const elfcpp::Ehdr<64, true>& ehdr) | |
132 | { | |
133 | return this->do_make_elf_object_implementation<64, true>(name, input_file, | |
134 | offset, ehdr); | |
135 | } | |
136 | #endif | |
137 | ||
bb04269c | 138 | } // End namespace gold. |