1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
// script-sections.h -- linker script SECTIONS for gold -*- C++ -*-
// Copyright 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
// This is for the support of the SECTIONS clause in linker scripts.
#ifndef GOLD_SCRIPT_SECTIONS_H
#define GOLD_SCRIPT_SECTIONS_H
#include <cstdio>
#include <vector>
namespace gold
{
struct Parser_output_section_header;
struct Parser_output_section_trailer;
struct Input_section_spec;
class Expression;
class Sections_element;
class Output_section_definition;
class Output_section;
class Output_segment;
class Script_sections
{
public:
Script_sections();
// Start a SECTIONS clause.
void
start_sections();
// Finish a SECTIONS clause.
void
finish_sections();
// Return whether we ever saw a SECTIONS clause. If we did, then
// all section layout needs to go through this class.
bool
saw_sections_clause() const
{ return this->saw_sections_clause_; }
// Return whether we are currently processing a SECTIONS clause.
bool
in_sections_clause() const
{ return this->in_sections_clause_; }
// Start processing entries for an output section.
void
start_output_section(const char* name, size_t namelen,
const Parser_output_section_header*);
// Finish processing entries for an output section.
void
finish_output_section(const Parser_output_section_trailer*);
// Add a data item to the current output section.
void
add_data(int size, bool is_signed, Expression* val);
// Add a symbol to be defined.
void
add_symbol_assignment(const char* name, size_t length, Expression* value,
bool provide, bool hidden);
// Add an assignment to the special dot symbol.
void
add_dot_assignment(Expression* value);
// Add an assertion.
void
add_assertion(Expression* check, const char* message, size_t messagelen);
// Add a setting for the fill value.
void
add_fill(Expression* val);
// Add an input section specification.
void
add_input_section(const Input_section_spec* spec, bool keep);
// Add any symbols we are defining to the symbol table.
void
add_symbols_to_table(Symbol_table*);
// Finalize symbol values and check assertions.
void
finalize_symbols(Symbol_table* symtab, const Layout* layout);
// Find the name of the output section to use for an input file name
// and section name. This returns a name, and sets
// *OUTPUT_SECTION_SLOT to point to the address where the actual
// output section may be stored.
// 1) If the input section should be discarded, this returns NULL
// and sets *OUTPUT_SECTION_SLOT to NULL.
// 2) If the input section is mapped by the SECTIONS clause, this
// returns the name to use for the output section (in permanent
// storage), and sets *OUTPUT_SECTION_SLOT to point to where the
// output section should be stored. **OUTPUT_SECTION_SLOT will be
// non-NULL if we have seen this output section already.
// 3) If the input section is not mapped by the SECTIONS clause,
// this returns SECTION_NAME, and sets *OUTPUT_SECTION_SLOT to
// NULL.
const char*
output_section_name(const char* file_name, const char* section_name,
Output_section*** output_section_slot);
// Place a marker for an orphan output section into the SECTIONS
// clause.
void
place_orphan(Output_section* os);
// Set the addresses of all the output sections. Return the segment
// which holds the file header and segment headers, if any.
Output_segment*
set_section_addresses(Symbol_table*, Layout*);
// Print the contents to the FILE. This is for debugging.
void
print(FILE*) const;
private:
typedef std::vector<Sections_element*> Sections_elements;
// Create segments.
Output_segment*
create_segments(Layout*);
// Create PT_NOTE and PT_TLS segments.
void
create_note_and_tls_segments(Layout*, const std::vector<Output_section*>*);
// Return whether the section is a BSS section.
static bool
is_bss_section(const Output_section*);
// True if we ever saw a SECTIONS clause.
bool saw_sections_clause_;
// True if we are currently processing a SECTIONS clause.
bool in_sections_clause_;
// The list of elements in the SECTIONS clause.
Sections_elements* sections_elements_;
// The current output section, if there is one.
Output_section_definition* output_section_;
};
} // End namespace gold.
#endif // !defined(GOLD_SCRIPT_SECTIONS_H
|
