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1 | // script-sections.h -- linker script SECTIONS for gold -*- C++ -*- |
2 | ||
3 | // Copyright 2008 Free Software Foundation, Inc. | |
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 | ||
23 | // This is for the support of the SECTIONS clause in linker scripts. | |
24 | ||
25 | #ifndef GOLD_SCRIPT_SECTIONS_H | |
26 | #define GOLD_SCRIPT_SECTIONS_H | |
27 | ||
28 | #include <cstdio> | |
29 | #include <vector> | |
30 | ||
31 | namespace gold | |
32 | { | |
33 | ||
34 | struct Parser_output_section_header; | |
35 | struct Parser_output_section_trailer; | |
36 | struct Input_section_spec; | |
37 | class Expression; | |
38 | class Sections_element; | |
39 | class Output_section_definition; | |
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40 | class Output_section; |
41 | class Output_segment; | |
494e05f4 ILT |
42 | |
43 | class Script_sections | |
44 | { | |
45 | public: | |
46 | Script_sections(); | |
47 | ||
48 | // Start a SECTIONS clause. | |
49 | void | |
50 | start_sections(); | |
51 | ||
52 | // Finish a SECTIONS clause. | |
53 | void | |
54 | finish_sections(); | |
55 | ||
56 | // Return whether we ever saw a SECTIONS clause. If we did, then | |
57 | // all section layout needs to go through this class. | |
58 | bool | |
59 | saw_sections_clause() const | |
60 | { return this->saw_sections_clause_; } | |
61 | ||
62 | // Return whether we are currently processing a SECTIONS clause. | |
63 | bool | |
64 | in_sections_clause() const | |
65 | { return this->in_sections_clause_; } | |
66 | ||
67 | // Start processing entries for an output section. | |
68 | void | |
69 | start_output_section(const char* name, size_t namelen, | |
70 | const Parser_output_section_header*); | |
71 | ||
72 | // Finish processing entries for an output section. | |
73 | void | |
74 | finish_output_section(const Parser_output_section_trailer*); | |
75 | ||
76 | // Add a data item to the current output section. | |
77 | void | |
78 | add_data(int size, bool is_signed, Expression* val); | |
79 | ||
80 | // Add a symbol to be defined. | |
81 | void | |
82 | add_symbol_assignment(const char* name, size_t length, Expression* value, | |
83 | bool provide, bool hidden); | |
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84 | |
85 | // Add an assignment to the special dot symbol. | |
86 | void | |
87 | add_dot_assignment(Expression* value); | |
88 | ||
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89 | // Add an assertion. |
90 | void | |
91 | add_assertion(Expression* check, const char* message, size_t messagelen); | |
92 | ||
93 | // Add a setting for the fill value. | |
94 | void | |
95 | add_fill(Expression* val); | |
96 | ||
97 | // Add an input section specification. | |
98 | void | |
99 | add_input_section(const Input_section_spec* spec, bool keep); | |
100 | ||
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101 | // Add any symbols we are defining to the symbol table. |
102 | void | |
103 | add_symbols_to_table(Symbol_table*); | |
104 | ||
105 | // Finalize symbol values and check assertions. | |
106 | void | |
107 | finalize_symbols(Symbol_table* symtab, const Layout* layout); | |
108 | ||
109 | // Find the name of the output section to use for an input file name | |
110 | // and section name. This returns a name, and sets | |
111 | // *OUTPUT_SECTION_SLOT to point to the address where the actual | |
112 | // output section may be stored. | |
113 | // 1) If the input section should be discarded, this returns NULL | |
114 | // and sets *OUTPUT_SECTION_SLOT to NULL. | |
115 | // 2) If the input section is mapped by the SECTIONS clause, this | |
116 | // returns the name to use for the output section (in permanent | |
117 | // storage), and sets *OUTPUT_SECTION_SLOT to point to where the | |
118 | // output section should be stored. **OUTPUT_SECTION_SLOT will be | |
119 | // non-NULL if we have seen this output section already. | |
120 | // 3) If the input section is not mapped by the SECTIONS clause, | |
121 | // this returns SECTION_NAME, and sets *OUTPUT_SECTION_SLOT to | |
122 | // NULL. | |
123 | const char* | |
124 | output_section_name(const char* file_name, const char* section_name, | |
125 | Output_section*** output_section_slot); | |
126 | ||
127 | // Place a marker for an orphan output section into the SECTIONS | |
128 | // clause. | |
129 | void | |
130 | place_orphan(Output_section* os); | |
131 | ||
132 | // Set the addresses of all the output sections. Return the segment | |
133 | // which holds the file header and segment headers, if any. | |
134 | Output_segment* | |
135 | set_section_addresses(Symbol_table*, Layout*); | |
136 | ||
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137 | // Return the number of segments we expect to create based on the |
138 | // SECTIONS clause. | |
139 | size_t | |
140 | expected_segment_count(const Layout*) const; | |
141 | ||
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142 | // Print the contents to the FILE. This is for debugging. |
143 | void | |
144 | print(FILE*) const; | |
145 | ||
146 | private: | |
147 | typedef std::vector<Sections_element*> Sections_elements; | |
148 | ||
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149 | // Create segments. |
150 | Output_segment* | |
151 | create_segments(Layout*); | |
152 | ||
153 | // Create PT_NOTE and PT_TLS segments. | |
154 | void | |
155 | create_note_and_tls_segments(Layout*, const std::vector<Output_section*>*); | |
156 | ||
157 | // Return whether the section is a BSS section. | |
158 | static bool | |
159 | is_bss_section(const Output_section*); | |
160 | ||
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161 | // True if we ever saw a SECTIONS clause. |
162 | bool saw_sections_clause_; | |
163 | // True if we are currently processing a SECTIONS clause. | |
164 | bool in_sections_clause_; | |
165 | // The list of elements in the SECTIONS clause. | |
166 | Sections_elements* sections_elements_; | |
167 | // The current output section, if there is one. | |
168 | Output_section_definition* output_section_; | |
169 | }; | |
170 | ||
171 | } // End namespace gold. | |
172 | ||
173 | #endif // !defined(GOLD_SCRIPT_SECTIONS_H |