1 // script.cc -- handle linker scripts for gold.
3 // Copyright (C) 2006-2016 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
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.
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.
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.
31 #include "filenames.h"
35 #include "dirsearch.h"
38 #include "workqueue.h"
40 #include "parameters.h"
43 #include "target-select.h"
46 #include "incremental.h"
51 // A token read from a script file. We don't implement keywords here;
52 // all keywords are simply represented as a string.
57 // Token classification.
62 // Token indicates end of input.
64 // Token is a string of characters.
66 // Token is a quoted string of characters.
68 // Token is an operator.
70 // Token is a number (an integer).
74 // We need an empty constructor so that we can put this STL objects.
76 : classification_(TOKEN_INVALID
), value_(NULL
), value_length_(0),
77 opcode_(0), lineno_(0), charpos_(0)
80 // A general token with no value.
81 Token(Classification classification
, int lineno
, int charpos
)
82 : classification_(classification
), value_(NULL
), value_length_(0),
83 opcode_(0), lineno_(lineno
), charpos_(charpos
)
85 gold_assert(classification
== TOKEN_INVALID
86 || classification
== TOKEN_EOF
);
89 // A general token with a value.
90 Token(Classification classification
, const char* value
, size_t length
,
91 int lineno
, int charpos
)
92 : classification_(classification
), value_(value
), value_length_(length
),
93 opcode_(0), lineno_(lineno
), charpos_(charpos
)
95 gold_assert(classification
!= TOKEN_INVALID
96 && classification
!= TOKEN_EOF
);
99 // A token representing an operator.
100 Token(int opcode
, int lineno
, int charpos
)
101 : classification_(TOKEN_OPERATOR
), value_(NULL
), value_length_(0),
102 opcode_(opcode
), lineno_(lineno
), charpos_(charpos
)
105 // Return whether the token is invalid.
108 { return this->classification_
== TOKEN_INVALID
; }
110 // Return whether this is an EOF token.
113 { return this->classification_
== TOKEN_EOF
; }
115 // Return the token classification.
117 classification() const
118 { return this->classification_
; }
120 // Return the line number at which the token starts.
123 { return this->lineno_
; }
125 // Return the character position at this the token starts.
128 { return this->charpos_
; }
130 // Get the value of a token.
133 string_value(size_t* length
) const
135 gold_assert(this->classification_
== TOKEN_STRING
136 || this->classification_
== TOKEN_QUOTED_STRING
);
137 *length
= this->value_length_
;
142 operator_value() const
144 gold_assert(this->classification_
== TOKEN_OPERATOR
);
145 return this->opcode_
;
149 integer_value() const;
152 // The token classification.
153 Classification classification_
;
154 // The token value, for TOKEN_STRING or TOKEN_QUOTED_STRING or
157 // The length of the token value.
158 size_t value_length_
;
159 // The token value, for TOKEN_OPERATOR.
161 // The line number where this token started (one based).
163 // The character position within the line where this token started
168 // Return the value of a TOKEN_INTEGER.
171 Token::integer_value() const
173 gold_assert(this->classification_
== TOKEN_INTEGER
);
175 size_t len
= this->value_length_
;
177 uint64_t multiplier
= 1;
178 char last
= this->value_
[len
- 1];
179 if (last
== 'm' || last
== 'M')
181 multiplier
= 1024 * 1024;
184 else if (last
== 'k' || last
== 'K')
191 uint64_t ret
= strtoull(this->value_
, &end
, 0);
192 gold_assert(static_cast<size_t>(end
- this->value_
) == len
);
194 return ret
* multiplier
;
197 // This class handles lexing a file into a sequence of tokens.
202 // We unfortunately have to support different lexing modes, because
203 // when reading different parts of a linker script we need to parse
204 // things differently.
207 // Reading an ordinary linker script.
209 // Reading an expression in a linker script.
211 // Reading a version script.
213 // Reading a --dynamic-list file.
217 Lex(const char* input_string
, size_t input_length
, int parsing_token
)
218 : input_string_(input_string
), input_length_(input_length
),
219 current_(input_string
), mode_(LINKER_SCRIPT
),
220 first_token_(parsing_token
), token_(),
221 lineno_(1), linestart_(input_string
)
224 // Read a file into a string.
226 read_file(Input_file
*, std::string
*);
228 // Return the next token.
232 // Return the current lexing mode.
235 { return this->mode_
; }
237 // Set the lexing mode.
240 { this->mode_
= mode
; }
244 Lex
& operator=(const Lex
&);
246 // Make a general token with no value at the current location.
248 make_token(Token::Classification c
, const char* start
) const
249 { return Token(c
, this->lineno_
, start
- this->linestart_
+ 1); }
251 // Make a general token with a value at the current location.
253 make_token(Token::Classification c
, const char* v
, size_t len
,
256 { return Token(c
, v
, len
, this->lineno_
, start
- this->linestart_
+ 1); }
258 // Make an operator token at the current location.
260 make_token(int opcode
, const char* start
) const
261 { return Token(opcode
, this->lineno_
, start
- this->linestart_
+ 1); }
263 // Make an invalid token at the current location.
265 make_invalid_token(const char* start
)
266 { return this->make_token(Token::TOKEN_INVALID
, start
); }
268 // Make an EOF token at the current location.
270 make_eof_token(const char* start
)
271 { return this->make_token(Token::TOKEN_EOF
, start
); }
273 // Return whether C can be the first character in a name. C2 is the
274 // next character, since we sometimes need that.
276 can_start_name(char c
, char c2
);
278 // If C can appear in a name which has already started, return a
279 // pointer to a character later in the token or just past
280 // it. Otherwise, return NULL.
282 can_continue_name(const char* c
);
284 // Return whether C, C2, C3 can start a hex number.
286 can_start_hex(char c
, char c2
, char c3
);
288 // If C can appear in a hex number which has already started, return
289 // a pointer to a character later in the token or just past
290 // it. Otherwise, return NULL.
292 can_continue_hex(const char* c
);
294 // Return whether C can start a non-hex number.
296 can_start_number(char c
);
298 // If C can appear in a decimal number which has already started,
299 // return a pointer to a character later in the token or just past
300 // it. Otherwise, return NULL.
302 can_continue_number(const char* c
)
303 { return Lex::can_start_number(*c
) ? c
+ 1 : NULL
; }
305 // If C1 C2 C3 form a valid three character operator, return the
306 // opcode. Otherwise return 0.
308 three_char_operator(char c1
, char c2
, char c3
);
310 // If C1 C2 form a valid two character operator, return the opcode.
311 // Otherwise return 0.
313 two_char_operator(char c1
, char c2
);
315 // If C1 is a valid one character operator, return the opcode.
316 // Otherwise return 0.
318 one_char_operator(char c1
);
320 // Read the next token.
322 get_token(const char**);
324 // Skip a C style /* */ comment. Return false if the comment did
327 skip_c_comment(const char**);
329 // Skip a line # comment. Return false if there was no newline.
331 skip_line_comment(const char**);
333 // Build a token CLASSIFICATION from all characters that match
334 // CAN_CONTINUE_FN. The token starts at START. Start matching from
335 // MATCH. Set *PP to the character following the token.
337 gather_token(Token::Classification
,
338 const char* (Lex::*can_continue_fn
)(const char*),
339 const char* start
, const char* match
, const char** pp
);
341 // Build a token from a quoted string.
343 gather_quoted_string(const char** pp
);
345 // The string we are tokenizing.
346 const char* input_string_
;
347 // The length of the string.
348 size_t input_length_
;
349 // The current offset into the string.
350 const char* current_
;
351 // The current lexing mode.
353 // The code to use for the first token. This is set to 0 after it
356 // The current token.
358 // The current line number.
360 // The start of the current line in the string.
361 const char* linestart_
;
364 // Read the whole file into memory. We don't expect linker scripts to
365 // be large, so we just use a std::string as a buffer. We ignore the
366 // data we've already read, so that we read aligned buffers.
369 Lex::read_file(Input_file
* input_file
, std::string
* contents
)
371 off_t filesize
= input_file
->file().filesize();
373 contents
->reserve(filesize
);
376 unsigned char buf
[BUFSIZ
];
377 while (off
< filesize
)
380 if (get
> filesize
- off
)
381 get
= filesize
- off
;
382 input_file
->file().read(off
, get
, buf
);
383 contents
->append(reinterpret_cast<char*>(&buf
[0]), get
);
388 // Return whether C can be the start of a name, if the next character
389 // is C2. A name can being with a letter, underscore, period, or
390 // dollar sign. Because a name can be a file name, we also permit
391 // forward slash, backslash, and tilde. Tilde is the tricky case
392 // here; GNU ld also uses it as a bitwise not operator. It is only
393 // recognized as the operator if it is not immediately followed by
394 // some character which can appear in a symbol. That is, when we
395 // don't know that we are looking at an expression, "~0" is a file
396 // name, and "~ 0" is an expression using bitwise not. We are
400 Lex::can_start_name(char c
, char c2
)
404 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
405 case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
406 case 'M': case 'N': case 'O': case 'Q': case 'P': case 'R':
407 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
409 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
410 case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
411 case 'm': case 'n': case 'o': case 'q': case 'p': case 'r':
412 case 's': case 't': case 'u': case 'v': case 'w': case 'x':
414 case '_': case '.': case '$':
418 return this->mode_
== LINKER_SCRIPT
;
421 return this->mode_
== LINKER_SCRIPT
&& can_continue_name(&c2
);
424 return (this->mode_
== VERSION_SCRIPT
425 || this->mode_
== DYNAMIC_LIST
426 || (this->mode_
== LINKER_SCRIPT
427 && can_continue_name(&c2
)));
434 // Return whether C can continue a name which has already started.
435 // Subsequent characters in a name are the same as the leading
436 // characters, plus digits and "=+-:[],?*". So in general the linker
437 // script language requires spaces around operators, unless we know
438 // that we are parsing an expression.
441 Lex::can_continue_name(const char* c
)
445 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
446 case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
447 case 'M': case 'N': case 'O': case 'Q': case 'P': case 'R':
448 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
450 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
451 case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
452 case 'm': case 'n': case 'o': case 'q': case 'p': case 'r':
453 case 's': case 't': case 'u': case 'v': case 'w': case 'x':
455 case '_': case '.': case '$':
456 case '0': case '1': case '2': case '3': case '4':
457 case '5': case '6': case '7': case '8': case '9':
460 // TODO(csilvers): why not allow ~ in names for version-scripts?
461 case '/': case '\\': case '~':
464 if (this->mode_
== LINKER_SCRIPT
)
468 case '[': case ']': case '*': case '?': case '-':
469 if (this->mode_
== LINKER_SCRIPT
|| this->mode_
== VERSION_SCRIPT
470 || this->mode_
== DYNAMIC_LIST
)
474 // TODO(csilvers): why allow this? ^ is meaningless in version scripts.
476 if (this->mode_
== VERSION_SCRIPT
|| this->mode_
== DYNAMIC_LIST
)
481 if (this->mode_
== LINKER_SCRIPT
)
483 else if ((this->mode_
== VERSION_SCRIPT
|| this->mode_
== DYNAMIC_LIST
)
486 // A name can have '::' in it, as that's a c++ namespace
487 // separator. But a single colon is not part of a name.
497 // For a number we accept 0x followed by hex digits, or any sequence
498 // of digits. The old linker accepts leading '$' for hex, and
499 // trailing HXBOD. Those are for MRI compatibility and we don't
502 // Return whether C1 C2 C3 can start a hex number.
505 Lex::can_start_hex(char c1
, char c2
, char c3
)
507 if (c1
== '0' && (c2
== 'x' || c2
== 'X'))
508 return this->can_continue_hex(&c3
);
512 // Return whether C can appear in a hex number.
515 Lex::can_continue_hex(const char* c
)
519 case '0': case '1': case '2': case '3': case '4':
520 case '5': case '6': case '7': case '8': case '9':
521 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
522 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
530 // Return whether C can start a non-hex number.
533 Lex::can_start_number(char c
)
537 case '0': case '1': case '2': case '3': case '4':
538 case '5': case '6': case '7': case '8': case '9':
546 // If C1 C2 C3 form a valid three character operator, return the
547 // opcode (defined in the yyscript.h file generated from yyscript.y).
548 // Otherwise return 0.
551 Lex::three_char_operator(char c1
, char c2
, char c3
)
556 if (c2
== '<' && c3
== '=')
560 if (c2
== '>' && c3
== '=')
569 // If C1 C2 form a valid two character operator, return the opcode
570 // (defined in the yyscript.h file generated from yyscript.y).
571 // Otherwise return 0.
574 Lex::two_char_operator(char c1
, char c2
)
632 // If C1 is a valid operator, return the opcode. Otherwise return 0.
635 Lex::one_char_operator(char c1
)
668 // Skip a C style comment. *PP points to just after the "/*". Return
669 // false if the comment did not end.
672 Lex::skip_c_comment(const char** pp
)
675 while (p
[0] != '*' || p
[1] != '/')
686 this->linestart_
= p
+ 1;
695 // Skip a line # comment. Return false if there was no newline.
698 Lex::skip_line_comment(const char** pp
)
701 size_t skip
= strcspn(p
, "\n");
710 this->linestart_
= p
;
716 // Build a token CLASSIFICATION from all characters that match
717 // CAN_CONTINUE_FN. Update *PP.
720 Lex::gather_token(Token::Classification classification
,
721 const char* (Lex::*can_continue_fn
)(const char*),
726 const char* new_match
= NULL
;
727 while ((new_match
= (this->*can_continue_fn
)(match
)) != NULL
)
730 // A special case: integers may be followed by a single M or K,
732 if (classification
== Token::TOKEN_INTEGER
733 && (*match
== 'm' || *match
== 'M' || *match
== 'k' || *match
== 'K'))
737 return this->make_token(classification
, start
, match
- start
, start
);
740 // Build a token from a quoted string.
743 Lex::gather_quoted_string(const char** pp
)
745 const char* start
= *pp
;
746 const char* p
= start
;
748 size_t skip
= strcspn(p
, "\"\n");
750 return this->make_invalid_token(start
);
752 return this->make_token(Token::TOKEN_QUOTED_STRING
, p
, skip
, start
);
755 // Return the next token at *PP. Update *PP. General guideline: we
756 // require linker scripts to be simple ASCII. No unicode linker
757 // scripts. In particular we can assume that any '\0' is the end of
761 Lex::get_token(const char** pp
)
770 return this->make_eof_token(p
);
773 // Skip whitespace quickly.
774 while (*p
== ' ' || *p
== '\t' || *p
== '\r')
781 this->linestart_
= p
;
785 // Skip C style comments.
786 if (p
[0] == '/' && p
[1] == '*')
788 int lineno
= this->lineno_
;
789 int charpos
= p
- this->linestart_
+ 1;
792 if (!this->skip_c_comment(pp
))
793 return Token(Token::TOKEN_INVALID
, lineno
, charpos
);
799 // Skip line comments.
803 if (!this->skip_line_comment(pp
))
804 return this->make_eof_token(p
);
810 if (this->can_start_name(p
[0], p
[1]))
811 return this->gather_token(Token::TOKEN_STRING
,
812 &Lex::can_continue_name
,
815 // We accept any arbitrary name in double quotes, as long as it
816 // does not cross a line boundary.
820 return this->gather_quoted_string(pp
);
823 // Check for a number.
825 if (this->can_start_hex(p
[0], p
[1], p
[2]))
826 return this->gather_token(Token::TOKEN_INTEGER
,
827 &Lex::can_continue_hex
,
830 if (Lex::can_start_number(p
[0]))
831 return this->gather_token(Token::TOKEN_INTEGER
,
832 &Lex::can_continue_number
,
835 // Check for operators.
837 int opcode
= Lex::three_char_operator(p
[0], p
[1], p
[2]);
841 return this->make_token(opcode
, p
);
844 opcode
= Lex::two_char_operator(p
[0], p
[1]);
848 return this->make_token(opcode
, p
);
851 opcode
= Lex::one_char_operator(p
[0]);
855 return this->make_token(opcode
, p
);
858 return this->make_token(Token::TOKEN_INVALID
, p
);
862 // Return the next token.
867 // The first token is special.
868 if (this->first_token_
!= 0)
870 this->token_
= Token(this->first_token_
, 0, 0);
871 this->first_token_
= 0;
872 return &this->token_
;
875 this->token_
= this->get_token(&this->current_
);
877 // Don't let an early null byte fool us into thinking that we've
878 // reached the end of the file.
879 if (this->token_
.is_eof()
880 && (static_cast<size_t>(this->current_
- this->input_string_
)
881 < this->input_length_
))
882 this->token_
= this->make_invalid_token(this->current_
);
884 return &this->token_
;
887 // class Symbol_assignment.
889 // Add the symbol to the symbol table. This makes sure the symbol is
890 // there and defined. The actual value is stored later. We can't
891 // determine the actual value at this point, because we can't
892 // necessarily evaluate the expression until all ordinary symbols have
895 // The GNU linker lets symbol assignments in the linker script
896 // silently override defined symbols in object files. We are
897 // compatible. FIXME: Should we issue a warning?
900 Symbol_assignment::add_to_table(Symbol_table
* symtab
)
902 elfcpp::STV vis
= this->hidden_
? elfcpp::STV_HIDDEN
: elfcpp::STV_DEFAULT
;
903 this->sym_
= symtab
->define_as_constant(this->name_
.c_str(),
906 ? Symbol_table::DEFSYM
907 : Symbol_table::SCRIPT
),
915 true); // force_override
918 // Finalize a symbol value.
921 Symbol_assignment::finalize(Symbol_table
* symtab
, const Layout
* layout
)
923 this->finalize_maybe_dot(symtab
, layout
, false, 0, NULL
);
926 // Finalize a symbol value which can refer to the dot symbol.
929 Symbol_assignment::finalize_with_dot(Symbol_table
* symtab
,
930 const Layout
* layout
,
932 Output_section
* dot_section
)
934 this->finalize_maybe_dot(symtab
, layout
, true, dot_value
, dot_section
);
937 // Finalize a symbol value, internal version.
940 Symbol_assignment::finalize_maybe_dot(Symbol_table
* symtab
,
941 const Layout
* layout
,
942 bool is_dot_available
,
944 Output_section
* dot_section
)
946 // If we were only supposed to provide this symbol, the sym_ field
947 // will be NULL if the symbol was not referenced.
948 if (this->sym_
== NULL
)
950 gold_assert(this->provide_
);
954 if (parameters
->target().get_size() == 32)
956 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
957 this->sized_finalize
<32>(symtab
, layout
, is_dot_available
, dot_value
,
963 else if (parameters
->target().get_size() == 64)
965 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
966 this->sized_finalize
<64>(symtab
, layout
, is_dot_available
, dot_value
,
978 Symbol_assignment::sized_finalize(Symbol_table
* symtab
, const Layout
* layout
,
979 bool is_dot_available
, uint64_t dot_value
,
980 Output_section
* dot_section
)
982 Output_section
* section
;
983 elfcpp::STT type
= elfcpp::STT_NOTYPE
;
984 elfcpp::STV vis
= elfcpp::STV_DEFAULT
;
985 unsigned char nonvis
= 0;
986 uint64_t final_val
= this->val_
->eval_maybe_dot(symtab
, layout
, true,
988 dot_value
, dot_section
,
989 §ion
, NULL
, &type
,
990 &vis
, &nonvis
, false, NULL
);
991 Sized_symbol
<size
>* ssym
= symtab
->get_sized_symbol
<size
>(this->sym_
);
992 ssym
->set_value(final_val
);
993 ssym
->set_type(type
);
994 ssym
->set_visibility(vis
);
995 ssym
->set_nonvis(nonvis
);
997 ssym
->set_output_section(section
);
1000 // Set the symbol value if the expression yields an absolute value or
1001 // a value relative to DOT_SECTION.
1004 Symbol_assignment::set_if_absolute(Symbol_table
* symtab
, const Layout
* layout
,
1005 bool is_dot_available
, uint64_t dot_value
,
1006 Output_section
* dot_section
)
1008 if (this->sym_
== NULL
)
1011 Output_section
* val_section
;
1013 uint64_t val
= this->val_
->eval_maybe_dot(symtab
, layout
, false,
1014 is_dot_available
, dot_value
,
1015 dot_section
, &val_section
, NULL
,
1016 NULL
, NULL
, NULL
, false, &is_valid
);
1017 if (!is_valid
|| (val_section
!= NULL
&& val_section
!= dot_section
))
1020 if (parameters
->target().get_size() == 32)
1022 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1023 Sized_symbol
<32>* ssym
= symtab
->get_sized_symbol
<32>(this->sym_
);
1024 ssym
->set_value(val
);
1029 else if (parameters
->target().get_size() == 64)
1031 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1032 Sized_symbol
<64>* ssym
= symtab
->get_sized_symbol
<64>(this->sym_
);
1033 ssym
->set_value(val
);
1040 if (val_section
!= NULL
)
1041 this->sym_
->set_output_section(val_section
);
1044 // Print for debugging.
1047 Symbol_assignment::print(FILE* f
) const
1049 if (this->provide_
&& this->hidden_
)
1050 fprintf(f
, "PROVIDE_HIDDEN(");
1051 else if (this->provide_
)
1052 fprintf(f
, "PROVIDE(");
1053 else if (this->hidden_
)
1056 fprintf(f
, "%s = ", this->name_
.c_str());
1057 this->val_
->print(f
);
1059 if (this->provide_
|| this->hidden_
)
1065 // Class Script_assertion.
1067 // Check the assertion.
1070 Script_assertion::check(const Symbol_table
* symtab
, const Layout
* layout
)
1072 if (!this->check_
->eval(symtab
, layout
, true))
1073 gold_error("%s", this->message_
.c_str());
1076 // Print for debugging.
1079 Script_assertion::print(FILE* f
) const
1081 fprintf(f
, "ASSERT(");
1082 this->check_
->print(f
);
1083 fprintf(f
, ", \"%s\")\n", this->message_
.c_str());
1086 // Class Script_options.
1088 Script_options::Script_options()
1089 : entry_(), symbol_assignments_(), symbol_definitions_(),
1090 symbol_references_(), version_script_info_(), script_sections_()
1094 // Returns true if NAME is on the list of symbol assignments waiting
1098 Script_options::is_pending_assignment(const char* name
)
1100 for (Symbol_assignments::iterator p
= this->symbol_assignments_
.begin();
1101 p
!= this->symbol_assignments_
.end();
1103 if ((*p
)->name() == name
)
1108 // Add a symbol to be defined.
1111 Script_options::add_symbol_assignment(const char* name
, size_t length
,
1112 bool is_defsym
, Expression
* value
,
1113 bool provide
, bool hidden
)
1115 if (length
!= 1 || name
[0] != '.')
1117 if (this->script_sections_
.in_sections_clause())
1119 gold_assert(!is_defsym
);
1120 this->script_sections_
.add_symbol_assignment(name
, length
, value
,
1125 Symbol_assignment
* p
= new Symbol_assignment(name
, length
, is_defsym
,
1126 value
, provide
, hidden
);
1127 this->symbol_assignments_
.push_back(p
);
1132 std::string
n(name
, length
);
1133 this->symbol_definitions_
.insert(n
);
1134 this->symbol_references_
.erase(n
);
1139 if (provide
|| hidden
)
1140 gold_error(_("invalid use of PROVIDE for dot symbol"));
1142 // The GNU linker permits assignments to dot outside of SECTIONS
1143 // clauses and treats them as occurring inside, so we don't
1144 // check in_sections_clause here.
1145 this->script_sections_
.add_dot_assignment(value
);
1149 // Add a reference to a symbol.
1152 Script_options::add_symbol_reference(const char* name
, size_t length
)
1154 if (length
!= 1 || name
[0] != '.')
1156 std::string
n(name
, length
);
1157 if (this->symbol_definitions_
.find(n
) == this->symbol_definitions_
.end())
1158 this->symbol_references_
.insert(n
);
1162 // Add an assertion.
1165 Script_options::add_assertion(Expression
* check
, const char* message
,
1168 if (this->script_sections_
.in_sections_clause())
1169 this->script_sections_
.add_assertion(check
, message
, messagelen
);
1172 Script_assertion
* p
= new Script_assertion(check
, message
, messagelen
);
1173 this->assertions_
.push_back(p
);
1177 // Create sections required by any linker scripts.
1180 Script_options::create_script_sections(Layout
* layout
)
1182 if (this->saw_sections_clause())
1183 this->script_sections_
.create_sections(layout
);
1186 // Add any symbols we are defining to the symbol table.
1189 Script_options::add_symbols_to_table(Symbol_table
* symtab
)
1191 for (Symbol_assignments::iterator p
= this->symbol_assignments_
.begin();
1192 p
!= this->symbol_assignments_
.end();
1194 (*p
)->add_to_table(symtab
);
1195 this->script_sections_
.add_symbols_to_table(symtab
);
1198 // Finalize symbol values. Also check assertions.
1201 Script_options::finalize_symbols(Symbol_table
* symtab
, const Layout
* layout
)
1203 // We finalize the symbols defined in SECTIONS first, because they
1204 // are the ones which may have changed. This way if symbol outside
1205 // SECTIONS are defined in terms of symbols inside SECTIONS, they
1206 // will get the right value.
1207 this->script_sections_
.finalize_symbols(symtab
, layout
);
1209 for (Symbol_assignments::iterator p
= this->symbol_assignments_
.begin();
1210 p
!= this->symbol_assignments_
.end();
1212 (*p
)->finalize(symtab
, layout
);
1214 for (Assertions::iterator p
= this->assertions_
.begin();
1215 p
!= this->assertions_
.end();
1217 (*p
)->check(symtab
, layout
);
1220 // Set section addresses. We set all the symbols which have absolute
1221 // values. Then we let the SECTIONS clause do its thing. This
1222 // returns the segment which holds the file header and segment
1226 Script_options::set_section_addresses(Symbol_table
* symtab
, Layout
* layout
)
1228 for (Symbol_assignments::iterator p
= this->symbol_assignments_
.begin();
1229 p
!= this->symbol_assignments_
.end();
1231 (*p
)->set_if_absolute(symtab
, layout
, false, 0, NULL
);
1233 return this->script_sections_
.set_section_addresses(symtab
, layout
);
1236 // This class holds data passed through the parser to the lexer and to
1237 // the parser support functions. This avoids global variables. We
1238 // can't use global variables because we need not be called by a
1239 // singleton thread.
1241 class Parser_closure
1244 Parser_closure(const char* filename
,
1245 const Position_dependent_options
& posdep_options
,
1246 bool parsing_defsym
, bool in_group
, bool is_in_sysroot
,
1247 Command_line
* command_line
,
1248 Script_options
* script_options
,
1250 bool skip_on_incompatible_target
,
1251 Script_info
* script_info
)
1252 : filename_(filename
), posdep_options_(posdep_options
),
1253 parsing_defsym_(parsing_defsym
), in_group_(in_group
),
1254 is_in_sysroot_(is_in_sysroot
),
1255 skip_on_incompatible_target_(skip_on_incompatible_target
),
1256 found_incompatible_target_(false),
1257 command_line_(command_line
), script_options_(script_options
),
1258 version_script_info_(script_options
->version_script_info()),
1259 lex_(lex
), lineno_(0), charpos_(0), lex_mode_stack_(), inputs_(NULL
),
1260 script_info_(script_info
)
1262 // We start out processing C symbols in the default lex mode.
1263 this->language_stack_
.push_back(Version_script_info::LANGUAGE_C
);
1264 this->lex_mode_stack_
.push_back(lex
->mode());
1267 // Return the file name.
1270 { return this->filename_
; }
1272 // Return the position dependent options. The caller may modify
1274 Position_dependent_options
&
1275 position_dependent_options()
1276 { return this->posdep_options_
; }
1278 // Whether we are parsing a --defsym.
1280 parsing_defsym() const
1281 { return this->parsing_defsym_
; }
1283 // Return whether this script is being run in a group.
1286 { return this->in_group_
; }
1288 // Return whether this script was found using a directory in the
1291 is_in_sysroot() const
1292 { return this->is_in_sysroot_
; }
1294 // Whether to skip to the next file with the same name if we find an
1295 // incompatible target in an OUTPUT_FORMAT statement.
1297 skip_on_incompatible_target() const
1298 { return this->skip_on_incompatible_target_
; }
1300 // Stop skipping to the next file on an incompatible target. This
1301 // is called when we make some unrevocable change to the data
1304 clear_skip_on_incompatible_target()
1305 { this->skip_on_incompatible_target_
= false; }
1307 // Whether we found an incompatible target in an OUTPUT_FORMAT
1310 found_incompatible_target() const
1311 { return this->found_incompatible_target_
; }
1313 // Note that we found an incompatible target.
1315 set_found_incompatible_target()
1316 { this->found_incompatible_target_
= true; }
1318 // Returns the Command_line structure passed in at constructor time.
1319 // This value may be NULL. The caller may modify this, which modifies
1320 // the passed-in Command_line object (not a copy).
1323 { return this->command_line_
; }
1325 // Return the options which may be set by a script.
1328 { return this->script_options_
; }
1330 // Return the object in which version script information should be stored.
1331 Version_script_info
*
1333 { return this->version_script_info_
; }
1335 // Return the next token, and advance.
1339 const Token
* token
= this->lex_
->next_token();
1340 this->lineno_
= token
->lineno();
1341 this->charpos_
= token
->charpos();
1345 // Set a new lexer mode, pushing the current one.
1347 push_lex_mode(Lex::Mode mode
)
1349 this->lex_mode_stack_
.push_back(this->lex_
->mode());
1350 this->lex_
->set_mode(mode
);
1353 // Pop the lexer mode.
1357 gold_assert(!this->lex_mode_stack_
.empty());
1358 this->lex_
->set_mode(this->lex_mode_stack_
.back());
1359 this->lex_mode_stack_
.pop_back();
1362 // Return the current lexer mode.
1365 { return this->lex_mode_stack_
.back(); }
1367 // Return the line number of the last token.
1370 { return this->lineno_
; }
1372 // Return the character position in the line of the last token.
1375 { return this->charpos_
; }
1377 // Return the list of input files, creating it if necessary. This
1378 // is a space leak--we never free the INPUTS_ pointer.
1382 if (this->inputs_
== NULL
)
1383 this->inputs_
= new Input_arguments();
1384 return this->inputs_
;
1387 // Return whether we saw any input files.
1390 { return this->inputs_
!= NULL
&& !this->inputs_
->empty(); }
1392 // Return the current language being processed in a version script
1393 // (eg, "C++"). The empty string represents unmangled C names.
1394 Version_script_info::Language
1395 get_current_language() const
1396 { return this->language_stack_
.back(); }
1398 // Push a language onto the stack when entering an extern block.
1400 push_language(Version_script_info::Language lang
)
1401 { this->language_stack_
.push_back(lang
); }
1403 // Pop a language off of the stack when exiting an extern block.
1407 gold_assert(!this->language_stack_
.empty());
1408 this->language_stack_
.pop_back();
1411 // Return a pointer to the incremental info.
1414 { return this->script_info_
; }
1417 // The name of the file we are reading.
1418 const char* filename_
;
1419 // The position dependent options.
1420 Position_dependent_options posdep_options_
;
1421 // True if we are parsing a --defsym.
1422 bool parsing_defsym_
;
1423 // Whether we are currently in a --start-group/--end-group.
1425 // Whether the script was found in a sysrooted directory.
1426 bool is_in_sysroot_
;
1427 // If this is true, then if we find an OUTPUT_FORMAT with an
1428 // incompatible target, then we tell the parser to abort so that we
1429 // can search for the next file with the same name.
1430 bool skip_on_incompatible_target_
;
1431 // True if we found an OUTPUT_FORMAT with an incompatible target.
1432 bool found_incompatible_target_
;
1433 // May be NULL if the user chooses not to pass one in.
1434 Command_line
* command_line_
;
1435 // Options which may be set from any linker script.
1436 Script_options
* script_options_
;
1437 // Information parsed from a version script.
1438 Version_script_info
* version_script_info_
;
1441 // The line number of the last token returned by next_token.
1443 // The column number of the last token returned by next_token.
1445 // A stack of lexer modes.
1446 std::vector
<Lex::Mode
> lex_mode_stack_
;
1447 // A stack of which extern/language block we're inside. Can be C++,
1448 // java, or empty for C.
1449 std::vector
<Version_script_info::Language
> language_stack_
;
1450 // New input files found to add to the link.
1451 Input_arguments
* inputs_
;
1452 // Pointer to incremental linking info.
1453 Script_info
* script_info_
;
1456 // FILE was found as an argument on the command line. Try to read it
1457 // as a script. Return true if the file was handled.
1460 read_input_script(Workqueue
* workqueue
, Symbol_table
* symtab
, Layout
* layout
,
1461 Dirsearch
* dirsearch
, int dirindex
,
1462 Input_objects
* input_objects
, Mapfile
* mapfile
,
1463 Input_group
* input_group
,
1464 const Input_argument
* input_argument
,
1465 Input_file
* input_file
, Task_token
* next_blocker
,
1466 bool* used_next_blocker
)
1468 *used_next_blocker
= false;
1470 std::string input_string
;
1471 Lex::read_file(input_file
, &input_string
);
1473 Lex
lex(input_string
.c_str(), input_string
.length(), PARSING_LINKER_SCRIPT
);
1475 Script_info
* script_info
= NULL
;
1476 if (layout
->incremental_inputs() != NULL
)
1478 const std::string
& filename
= input_file
->filename();
1479 Timespec mtime
= input_file
->file().get_mtime();
1480 unsigned int arg_serial
= input_argument
->file().arg_serial();
1481 script_info
= new Script_info(filename
);
1482 layout
->incremental_inputs()->report_script(script_info
, arg_serial
,
1486 Parser_closure
closure(input_file
->filename().c_str(),
1487 input_argument
->file().options(),
1489 input_group
!= NULL
,
1490 input_file
->is_in_sysroot(),
1492 layout
->script_options(),
1494 input_file
->will_search_for(),
1497 bool old_saw_sections_clause
=
1498 layout
->script_options()->saw_sections_clause();
1500 if (yyparse(&closure
) != 0)
1502 if (closure
.found_incompatible_target())
1504 Read_symbols::incompatible_warning(input_argument
, input_file
);
1505 Read_symbols::requeue(workqueue
, input_objects
, symtab
, layout
,
1506 dirsearch
, dirindex
, mapfile
, input_argument
,
1507 input_group
, next_blocker
);
1513 if (!old_saw_sections_clause
1514 && layout
->script_options()->saw_sections_clause()
1515 && layout
->have_added_input_section())
1516 gold_error(_("%s: SECTIONS seen after other input files; try -T/--script"),
1517 input_file
->filename().c_str());
1519 if (!closure
.saw_inputs())
1522 Task_token
* this_blocker
= NULL
;
1523 for (Input_arguments::const_iterator p
= closure
.inputs()->begin();
1524 p
!= closure
.inputs()->end();
1528 if (p
+ 1 == closure
.inputs()->end())
1532 nb
= new Task_token(true);
1535 workqueue
->queue_soon(new Read_symbols(input_objects
, symtab
,
1536 layout
, dirsearch
, 0, mapfile
, &*p
,
1537 input_group
, NULL
, this_blocker
, nb
));
1541 *used_next_blocker
= true;
1546 // Helper function for read_version_script(), read_commandline_script() and
1547 // script_include_directive(). Processes the given file in the mode indicated
1548 // by first_token and lex_mode.
1551 read_script_file(const char* filename
, Command_line
* cmdline
,
1552 Script_options
* script_options
,
1553 int first_token
, Lex::Mode lex_mode
)
1555 Dirsearch dirsearch
;
1556 std::string name
= filename
;
1558 // If filename is a relative filename, search for it manually using "." +
1559 // cmdline->options()->library_path() -- not dirsearch.
1560 if (!IS_ABSOLUTE_PATH(filename
))
1562 const General_options::Dir_list
& search_path
=
1563 cmdline
->options().library_path();
1564 name
= Dirsearch::find_file_in_dir_list(name
, search_path
, ".");
1567 // The file locking code wants to record a Task, but we haven't
1568 // started the workqueue yet. This is only for debugging purposes,
1569 // so we invent a fake value.
1570 const Task
* task
= reinterpret_cast<const Task
*>(-1);
1572 // We don't want this file to be opened in binary mode.
1573 Position_dependent_options posdep
= cmdline
->position_dependent_options();
1574 if (posdep
.format_enum() == General_options::OBJECT_FORMAT_BINARY
)
1575 posdep
.set_format_enum(General_options::OBJECT_FORMAT_ELF
);
1576 Input_file_argument
input_argument(name
.c_str(),
1577 Input_file_argument::INPUT_FILE_TYPE_FILE
,
1579 Input_file
input_file(&input_argument
);
1581 if (!input_file
.open(dirsearch
, task
, &dummy
))
1584 std::string input_string
;
1585 Lex::read_file(&input_file
, &input_string
);
1587 Lex
lex(input_string
.c_str(), input_string
.length(), first_token
);
1588 lex
.set_mode(lex_mode
);
1590 Parser_closure
closure(filename
,
1591 cmdline
->position_dependent_options(),
1592 first_token
== Lex::DYNAMIC_LIST
,
1594 input_file
.is_in_sysroot(),
1600 if (yyparse(&closure
) != 0)
1602 input_file
.file().unlock(task
);
1606 input_file
.file().unlock(task
);
1608 gold_assert(!closure
.saw_inputs());
1613 // FILENAME was found as an argument to --script (-T).
1614 // Read it as a script, and execute its contents immediately.
1617 read_commandline_script(const char* filename
, Command_line
* cmdline
)
1619 return read_script_file(filename
, cmdline
, &cmdline
->script_options(),
1620 PARSING_LINKER_SCRIPT
, Lex::LINKER_SCRIPT
);
1623 // FILENAME was found as an argument to --version-script. Read it as
1624 // a version script, and store its contents in
1625 // cmdline->script_options()->version_script_info().
1628 read_version_script(const char* filename
, Command_line
* cmdline
)
1630 return read_script_file(filename
, cmdline
, &cmdline
->script_options(),
1631 PARSING_VERSION_SCRIPT
, Lex::VERSION_SCRIPT
);
1634 // FILENAME was found as an argument to --dynamic-list. Read it as a
1635 // list of symbols, and store its contents in DYNAMIC_LIST.
1638 read_dynamic_list(const char* filename
, Command_line
* cmdline
,
1639 Script_options
* dynamic_list
)
1641 return read_script_file(filename
, cmdline
, dynamic_list
,
1642 PARSING_DYNAMIC_LIST
, Lex::DYNAMIC_LIST
);
1645 // Implement the --defsym option on the command line. Return true if
1649 Script_options::define_symbol(const char* definition
)
1651 Lex
lex(definition
, strlen(definition
), PARSING_DEFSYM
);
1652 lex
.set_mode(Lex::EXPRESSION
);
1655 Position_dependent_options posdep_options
;
1657 Parser_closure
closure("command line", posdep_options
, true,
1658 false, false, NULL
, this, &lex
, false, NULL
);
1660 if (yyparse(&closure
) != 0)
1663 gold_assert(!closure
.saw_inputs());
1668 // Print the script to F for debugging.
1671 Script_options::print(FILE* f
) const
1673 fprintf(f
, "%s: Dumping linker script\n", program_name
);
1675 if (!this->entry_
.empty())
1676 fprintf(f
, "ENTRY(%s)\n", this->entry_
.c_str());
1678 for (Symbol_assignments::const_iterator p
=
1679 this->symbol_assignments_
.begin();
1680 p
!= this->symbol_assignments_
.end();
1684 for (Assertions::const_iterator p
= this->assertions_
.begin();
1685 p
!= this->assertions_
.end();
1689 this->script_sections_
.print(f
);
1691 this->version_script_info_
.print(f
);
1694 // Manage mapping from keywords to the codes expected by the bison
1695 // parser. We construct one global object for each lex mode with
1698 class Keyword_to_parsecode
1701 // The structure which maps keywords to parsecodes.
1702 struct Keyword_parsecode
1705 const char* keyword
;
1706 // Corresponding parsecode.
1710 Keyword_to_parsecode(const Keyword_parsecode
* keywords
,
1712 : keyword_parsecodes_(keywords
), keyword_count_(keyword_count
)
1715 // Return the parsecode corresponding KEYWORD, or 0 if it is not a
1718 keyword_to_parsecode(const char* keyword
, size_t len
) const;
1721 const Keyword_parsecode
* keyword_parsecodes_
;
1722 const int keyword_count_
;
1725 // Mapping from keyword string to keyword parsecode. This array must
1726 // be kept in sorted order. Parsecodes are looked up using bsearch.
1727 // This array must correspond to the list of parsecodes in yyscript.y.
1729 static const Keyword_to_parsecode::Keyword_parsecode
1730 script_keyword_parsecodes
[] =
1732 { "ABSOLUTE", ABSOLUTE
},
1734 { "ALIGN", ALIGN_K
},
1735 { "ALIGNOF", ALIGNOF
},
1736 { "ASSERT", ASSERT_K
},
1737 { "AS_NEEDED", AS_NEEDED
},
1742 { "CONSTANT", CONSTANT
},
1743 { "CONSTRUCTORS", CONSTRUCTORS
},
1745 { "CREATE_OBJECT_SYMBOLS", CREATE_OBJECT_SYMBOLS
},
1746 { "DATA_SEGMENT_ALIGN", DATA_SEGMENT_ALIGN
},
1747 { "DATA_SEGMENT_END", DATA_SEGMENT_END
},
1748 { "DATA_SEGMENT_RELRO_END", DATA_SEGMENT_RELRO_END
},
1749 { "DEFINED", DEFINED
},
1752 { "EXCLUDE_FILE", EXCLUDE_FILE
},
1753 { "EXTERN", EXTERN
},
1756 { "FORCE_COMMON_ALLOCATION", FORCE_COMMON_ALLOCATION
},
1759 { "INCLUDE", INCLUDE
},
1761 { "INHIBIT_COMMON_ALLOCATION", INHIBIT_COMMON_ALLOCATION
},
1764 { "LENGTH", LENGTH
},
1765 { "LOADADDR", LOADADDR
},
1769 { "MEMORY", MEMORY
},
1772 { "NOCROSSREFS", NOCROSSREFS
},
1773 { "NOFLOAT", NOFLOAT
},
1774 { "NOLOAD", NOLOAD
},
1775 { "ONLY_IF_RO", ONLY_IF_RO
},
1776 { "ONLY_IF_RW", ONLY_IF_RW
},
1777 { "OPTION", OPTION
},
1778 { "ORIGIN", ORIGIN
},
1779 { "OUTPUT", OUTPUT
},
1780 { "OUTPUT_ARCH", OUTPUT_ARCH
},
1781 { "OUTPUT_FORMAT", OUTPUT_FORMAT
},
1782 { "OVERLAY", OVERLAY
},
1784 { "PROVIDE", PROVIDE
},
1785 { "PROVIDE_HIDDEN", PROVIDE_HIDDEN
},
1787 { "SEARCH_DIR", SEARCH_DIR
},
1788 { "SECTIONS", SECTIONS
},
1789 { "SEGMENT_START", SEGMENT_START
},
1791 { "SIZEOF", SIZEOF
},
1792 { "SIZEOF_HEADERS", SIZEOF_HEADERS
},
1793 { "SORT", SORT_BY_NAME
},
1794 { "SORT_BY_ALIGNMENT", SORT_BY_ALIGNMENT
},
1795 { "SORT_BY_INIT_PRIORITY", SORT_BY_INIT_PRIORITY
},
1796 { "SORT_BY_NAME", SORT_BY_NAME
},
1797 { "SPECIAL", SPECIAL
},
1799 { "STARTUP", STARTUP
},
1800 { "SUBALIGN", SUBALIGN
},
1801 { "SYSLIB", SYSLIB
},
1802 { "TARGET", TARGET_K
},
1803 { "TRUNCATE", TRUNCATE
},
1804 { "VERSION", VERSIONK
},
1805 { "global", GLOBAL
},
1811 { "sizeof_headers", SIZEOF_HEADERS
},
1814 static const Keyword_to_parsecode
1815 script_keywords(&script_keyword_parsecodes
[0],
1816 (sizeof(script_keyword_parsecodes
)
1817 / sizeof(script_keyword_parsecodes
[0])));
1819 static const Keyword_to_parsecode::Keyword_parsecode
1820 version_script_keyword_parsecodes
[] =
1822 { "extern", EXTERN
},
1823 { "global", GLOBAL
},
1827 static const Keyword_to_parsecode
1828 version_script_keywords(&version_script_keyword_parsecodes
[0],
1829 (sizeof(version_script_keyword_parsecodes
)
1830 / sizeof(version_script_keyword_parsecodes
[0])));
1832 static const Keyword_to_parsecode::Keyword_parsecode
1833 dynamic_list_keyword_parsecodes
[] =
1835 { "extern", EXTERN
},
1838 static const Keyword_to_parsecode
1839 dynamic_list_keywords(&dynamic_list_keyword_parsecodes
[0],
1840 (sizeof(dynamic_list_keyword_parsecodes
)
1841 / sizeof(dynamic_list_keyword_parsecodes
[0])));
1845 // Comparison function passed to bsearch.
1857 ktt_compare(const void* keyv
, const void* kttv
)
1859 const Ktt_key
* key
= static_cast<const Ktt_key
*>(keyv
);
1860 const Keyword_to_parsecode::Keyword_parsecode
* ktt
=
1861 static_cast<const Keyword_to_parsecode::Keyword_parsecode
*>(kttv
);
1862 int i
= strncmp(key
->str
, ktt
->keyword
, key
->len
);
1865 if (ktt
->keyword
[key
->len
] != '\0')
1870 } // End extern "C".
1873 Keyword_to_parsecode::keyword_to_parsecode(const char* keyword
,
1879 void* kttv
= bsearch(&key
,
1880 this->keyword_parsecodes_
,
1881 this->keyword_count_
,
1882 sizeof(this->keyword_parsecodes_
[0]),
1886 Keyword_parsecode
* ktt
= static_cast<Keyword_parsecode
*>(kttv
);
1887 return ktt
->parsecode
;
1890 // The following structs are used within the VersionInfo class as well
1891 // as in the bison helper functions. They store the information
1892 // parsed from the version script.
1894 // A single version expression.
1895 // For example, pattern="std::map*" and language="C++".
1896 struct Version_expression
1898 Version_expression(const std::string
& a_pattern
,
1899 Version_script_info::Language a_language
,
1901 : pattern(a_pattern
), language(a_language
), exact_match(a_exact_match
),
1902 was_matched_by_symbol(false)
1905 std::string pattern
;
1906 Version_script_info::Language language
;
1907 // If false, we use glob() to match pattern. If true, we use strcmp().
1909 // True if --no-undefined-version is in effect and we found this
1910 // version in get_symbol_version. We use mutable because this
1911 // struct is generally not modifiable after it has been created.
1912 mutable bool was_matched_by_symbol
;
1915 // A list of expressions.
1916 struct Version_expression_list
1918 std::vector
<struct Version_expression
> expressions
;
1921 // A list of which versions upon which another version depends.
1922 // Strings should be from the Stringpool.
1923 struct Version_dependency_list
1925 std::vector
<std::string
> dependencies
;
1928 // The total definition of a version. It includes the tag for the
1929 // version, its global and local expressions, and any dependencies.
1933 : tag(), global(NULL
), local(NULL
), dependencies(NULL
)
1937 const struct Version_expression_list
* global
;
1938 const struct Version_expression_list
* local
;
1939 const struct Version_dependency_list
* dependencies
;
1942 // Helper class that calls cplus_demangle when needed and takes care of freeing
1945 class Lazy_demangler
1948 Lazy_demangler(const char* symbol
, int options
)
1949 : symbol_(symbol
), options_(options
), demangled_(NULL
), did_demangle_(false)
1953 { free(this->demangled_
); }
1955 // Return the demangled name. The actual demangling happens on the first call,
1956 // and the result is later cached.
1961 // The symbol to demangle.
1962 const char* symbol_
;
1963 // Option flags to pass to cplus_demagle.
1965 // The cached demangled value, or NULL if demangling didn't happen yet or
1968 // Whether we already called cplus_demangle
1972 // Return the demangled name. The actual demangling happens on the first call,
1973 // and the result is later cached. Returns NULL if the symbol cannot be
1977 Lazy_demangler::get()
1979 if (!this->did_demangle_
)
1981 this->demangled_
= cplus_demangle(this->symbol_
, this->options_
);
1982 this->did_demangle_
= true;
1984 return this->demangled_
;
1987 // Class Version_script_info.
1989 Version_script_info::Version_script_info()
1990 : dependency_lists_(), expression_lists_(), version_trees_(), globs_(),
1991 default_version_(NULL
), default_is_global_(false), is_finalized_(false)
1993 for (int i
= 0; i
< LANGUAGE_COUNT
; ++i
)
1994 this->exact_
[i
] = NULL
;
1997 Version_script_info::~Version_script_info()
2001 // Forget all the known version script information.
2004 Version_script_info::clear()
2006 for (size_t k
= 0; k
< this->dependency_lists_
.size(); ++k
)
2007 delete this->dependency_lists_
[k
];
2008 this->dependency_lists_
.clear();
2009 for (size_t k
= 0; k
< this->version_trees_
.size(); ++k
)
2010 delete this->version_trees_
[k
];
2011 this->version_trees_
.clear();
2012 for (size_t k
= 0; k
< this->expression_lists_
.size(); ++k
)
2013 delete this->expression_lists_
[k
];
2014 this->expression_lists_
.clear();
2017 // Finalize the version script information.
2020 Version_script_info::finalize()
2022 if (!this->is_finalized_
)
2024 this->build_lookup_tables();
2025 this->is_finalized_
= true;
2029 // Return all the versions.
2031 std::vector
<std::string
>
2032 Version_script_info::get_versions() const
2034 std::vector
<std::string
> ret
;
2035 for (size_t j
= 0; j
< this->version_trees_
.size(); ++j
)
2036 if (!this->version_trees_
[j
]->tag
.empty())
2037 ret
.push_back(this->version_trees_
[j
]->tag
);
2041 // Return the dependencies of VERSION.
2043 std::vector
<std::string
>
2044 Version_script_info::get_dependencies(const char* version
) const
2046 std::vector
<std::string
> ret
;
2047 for (size_t j
= 0; j
< this->version_trees_
.size(); ++j
)
2048 if (this->version_trees_
[j
]->tag
== version
)
2050 const struct Version_dependency_list
* deps
=
2051 this->version_trees_
[j
]->dependencies
;
2053 for (size_t k
= 0; k
< deps
->dependencies
.size(); ++k
)
2054 ret
.push_back(deps
->dependencies
[k
]);
2060 // A version script essentially maps a symbol name to a version tag
2061 // and an indication of whether symbol is global or local within that
2062 // version tag. Each symbol maps to at most one version tag.
2063 // Unfortunately, in practice, version scripts are ambiguous, and list
2064 // symbols multiple times. Thus, we have to document the matching
2067 // This is a description of what the GNU linker does as of 2010-01-11.
2068 // It walks through the version tags in the order in which they appear
2069 // in the version script. For each tag, it first walks through the
2070 // global patterns for that tag, then the local patterns. When
2071 // looking at a single pattern, it first applies any language specific
2072 // demangling as specified for the pattern, and then matches the
2073 // resulting symbol name to the pattern. If it finds an exact match
2074 // for a literal pattern (a pattern enclosed in quotes or with no
2075 // wildcard characters), then that is the match that it uses. If
2076 // finds a match with a wildcard pattern, then it saves it and
2077 // continues searching. Wildcard patterns that are exactly "*" are
2078 // saved separately.
2080 // If no exact match with a literal pattern is ever found, then if a
2081 // wildcard match with a global pattern was found it is used,
2082 // otherwise if a wildcard match with a local pattern was found it is
2085 // This is the result:
2086 // * If there is an exact match, then we use the first tag in the
2087 // version script where it matches.
2088 // + If the exact match in that tag is global, it is used.
2089 // + Otherwise the exact match in that tag is local, and is used.
2090 // * Otherwise, if there is any match with a global wildcard pattern:
2091 // + If there is any match with a wildcard pattern which is not
2092 // "*", then we use the tag in which the *last* such pattern
2094 // + Otherwise, we matched "*". If there is no match with a local
2095 // wildcard pattern which is not "*", then we use the *last*
2096 // match with a global "*". Otherwise, continue.
2097 // * Otherwise, if there is any match with a local wildcard pattern:
2098 // + If there is any match with a wildcard pattern which is not
2099 // "*", then we use the tag in which the *last* such pattern
2101 // + Otherwise, we matched "*", and we use the tag in which the
2102 // *last* such match occurred.
2104 // There is an additional wrinkle. When the GNU linker finds a symbol
2105 // with a version defined in an object file due to a .symver
2106 // directive, it looks up that symbol name in that version tag. If it
2107 // finds it, it matches the symbol name against the patterns for that
2108 // version. If there is no match with a global pattern, but there is
2109 // a match with a local pattern, then the GNU linker marks the symbol
2112 // We want gold to be generally compatible, but we also want gold to
2113 // be fast. These are the rules that gold implements:
2114 // * If there is an exact match for the mangled name, we use it.
2115 // + If there is more than one exact match, we give a warning, and
2116 // we use the first tag in the script which matches.
2117 // + If a symbol has an exact match as both global and local for
2118 // the same version tag, we give an error.
2119 // * Otherwise, we look for an extern C++ or an extern Java exact
2120 // match. If we find an exact match, we use it.
2121 // + If there is more than one exact match, we give a warning, and
2122 // we use the first tag in the script which matches.
2123 // + If a symbol has an exact match as both global and local for
2124 // the same version tag, we give an error.
2125 // * Otherwise, we look through the wildcard patterns, ignoring "*"
2126 // patterns. We look through the version tags in reverse order.
2127 // For each version tag, we look through the global patterns and
2128 // then the local patterns. We use the first match we find (i.e.,
2129 // the last matching version tag in the file).
2130 // * Otherwise, we use the "*" pattern if there is one. We give an
2131 // error if there are multiple "*" patterns.
2133 // At least for now, gold does not look up the version tag for a
2134 // symbol version found in an object file to see if it should be
2135 // forced local. There are other ways to force a symbol to be local,
2136 // and I don't understand why this one is useful.
2138 // Build a set of fast lookup tables for a version script.
2141 Version_script_info::build_lookup_tables()
2143 size_t size
= this->version_trees_
.size();
2144 for (size_t j
= 0; j
< size
; ++j
)
2146 const Version_tree
* v
= this->version_trees_
[j
];
2147 this->build_expression_list_lookup(v
->local
, v
, false);
2148 this->build_expression_list_lookup(v
->global
, v
, true);
2152 // If a pattern has backlashes but no unquoted wildcard characters,
2153 // then we apply backslash unquoting and look for an exact match.
2154 // Otherwise we treat it as a wildcard pattern. This function returns
2155 // true for a wildcard pattern. Otherwise, it does backslash
2156 // unquoting on *PATTERN and returns false. If this returns true,
2157 // *PATTERN may have been partially unquoted.
2160 Version_script_info::unquote(std::string
* pattern
) const
2162 bool saw_backslash
= false;
2163 size_t len
= pattern
->length();
2165 for (size_t i
= 0; i
< len
; ++i
)
2168 saw_backslash
= false;
2171 switch ((*pattern
)[i
])
2173 case '?': case '[': case '*':
2176 saw_backslash
= true;
2184 (*pattern
)[j
] = (*pattern
)[i
];
2190 // Add an exact match for MATCH to *PE. The result of the match is
2194 Version_script_info::add_exact_match(const std::string
& match
,
2195 const Version_tree
* v
, bool is_global
,
2196 const Version_expression
* ve
,
2199 std::pair
<Exact::iterator
, bool> ins
=
2200 pe
->insert(std::make_pair(match
, Version_tree_match(v
, is_global
, ve
)));
2203 // This is the first time we have seen this match.
2207 Version_tree_match
& vtm(ins
.first
->second
);
2208 if (vtm
.real
->tag
!= v
->tag
)
2210 // This is an ambiguous match. We still return the
2211 // first version that we found in the script, but we
2212 // record the new version to issue a warning if we
2213 // wind up looking up this symbol.
2214 if (vtm
.ambiguous
== NULL
)
2217 else if (is_global
!= vtm
.is_global
)
2219 // We have a match for both the global and local entries for a
2220 // version tag. That's got to be wrong.
2221 gold_error(_("'%s' appears as both a global and a local symbol "
2222 "for version '%s' in script"),
2223 match
.c_str(), v
->tag
.c_str());
2227 // Build fast lookup information for EXPLIST and store it in LOOKUP.
2228 // All matches go to V, and IS_GLOBAL is true if they are global
2232 Version_script_info::build_expression_list_lookup(
2233 const Version_expression_list
* explist
,
2234 const Version_tree
* v
,
2237 if (explist
== NULL
)
2239 size_t size
= explist
->expressions
.size();
2240 for (size_t i
= 0; i
< size
; ++i
)
2242 const Version_expression
& exp(explist
->expressions
[i
]);
2244 if (exp
.pattern
.length() == 1 && exp
.pattern
[0] == '*')
2246 if (this->default_version_
!= NULL
2247 && this->default_version_
->tag
!= v
->tag
)
2248 gold_warning(_("wildcard match appears in both version '%s' "
2249 "and '%s' in script"),
2250 this->default_version_
->tag
.c_str(), v
->tag
.c_str());
2251 else if (this->default_version_
!= NULL
2252 && this->default_is_global_
!= is_global
)
2253 gold_error(_("wildcard match appears as both global and local "
2254 "in version '%s' in script"),
2256 this->default_version_
= v
;
2257 this->default_is_global_
= is_global
;
2261 std::string pattern
= exp
.pattern
;
2262 if (!exp
.exact_match
)
2264 if (this->unquote(&pattern
))
2266 this->globs_
.push_back(Glob(&exp
, v
, is_global
));
2271 if (this->exact_
[exp
.language
] == NULL
)
2272 this->exact_
[exp
.language
] = new Exact();
2273 this->add_exact_match(pattern
, v
, is_global
, &exp
,
2274 this->exact_
[exp
.language
]);
2278 // Return the name to match given a name, a language code, and two
2282 Version_script_info::get_name_to_match(const char* name
,
2284 Lazy_demangler
* cpp_demangler
,
2285 Lazy_demangler
* java_demangler
) const
2292 return cpp_demangler
->get();
2294 return java_demangler
->get();
2300 // Look up SYMBOL_NAME in the list of versions. Return true if the
2301 // symbol is found, false if not. If the symbol is found, then if
2302 // PVERSION is not NULL, set *PVERSION to the version tag, and if
2303 // P_IS_GLOBAL is not NULL, set *P_IS_GLOBAL according to whether the
2304 // symbol is global or not.
2307 Version_script_info::get_symbol_version(const char* symbol_name
,
2308 std::string
* pversion
,
2309 bool* p_is_global
) const
2311 Lazy_demangler
cpp_demangled_name(symbol_name
, DMGL_ANSI
| DMGL_PARAMS
);
2312 Lazy_demangler
java_demangled_name(symbol_name
,
2313 DMGL_ANSI
| DMGL_PARAMS
| DMGL_JAVA
);
2315 gold_assert(this->is_finalized_
);
2316 for (int i
= 0; i
< LANGUAGE_COUNT
; ++i
)
2318 Exact
* exact
= this->exact_
[i
];
2322 const char* name_to_match
= this->get_name_to_match(symbol_name
, i
,
2323 &cpp_demangled_name
,
2324 &java_demangled_name
);
2325 if (name_to_match
== NULL
)
2327 // If the name can not be demangled, the GNU linker goes
2328 // ahead and tries to match it anyhow. That does not
2329 // make sense to me and I have not implemented it.
2333 Exact::const_iterator pe
= exact
->find(name_to_match
);
2334 if (pe
!= exact
->end())
2336 const Version_tree_match
& vtm(pe
->second
);
2337 if (vtm
.ambiguous
!= NULL
)
2338 gold_warning(_("using '%s' as version for '%s' which is also "
2339 "named in version '%s' in script"),
2340 vtm
.real
->tag
.c_str(), name_to_match
,
2341 vtm
.ambiguous
->tag
.c_str());
2343 if (pversion
!= NULL
)
2344 *pversion
= vtm
.real
->tag
;
2345 if (p_is_global
!= NULL
)
2346 *p_is_global
= vtm
.is_global
;
2348 // If we are using --no-undefined-version, and this is a
2349 // global symbol, we have to record that we have found this
2350 // symbol, so that we don't warn about it. We have to do
2351 // this now, because otherwise we have no way to get from a
2352 // non-C language back to the demangled name that we
2354 if (p_is_global
!= NULL
&& vtm
.is_global
)
2355 vtm
.expression
->was_matched_by_symbol
= true;
2361 // Look through the glob patterns in reverse order.
2363 for (Globs::const_reverse_iterator p
= this->globs_
.rbegin();
2364 p
!= this->globs_
.rend();
2367 int language
= p
->expression
->language
;
2368 const char* name_to_match
= this->get_name_to_match(symbol_name
,
2370 &cpp_demangled_name
,
2371 &java_demangled_name
);
2372 if (name_to_match
== NULL
)
2375 if (fnmatch(p
->expression
->pattern
.c_str(), name_to_match
,
2378 if (pversion
!= NULL
)
2379 *pversion
= p
->version
->tag
;
2380 if (p_is_global
!= NULL
)
2381 *p_is_global
= p
->is_global
;
2386 // Finally, there may be a wildcard.
2387 if (this->default_version_
!= NULL
)
2389 if (pversion
!= NULL
)
2390 *pversion
= this->default_version_
->tag
;
2391 if (p_is_global
!= NULL
)
2392 *p_is_global
= this->default_is_global_
;
2399 // Give an error if any exact symbol names (not wildcards) appear in a
2400 // version script, but there is no such symbol.
2403 Version_script_info::check_unmatched_names(const Symbol_table
* symtab
) const
2405 for (size_t i
= 0; i
< this->version_trees_
.size(); ++i
)
2407 const Version_tree
* vt
= this->version_trees_
[i
];
2408 if (vt
->global
== NULL
)
2410 for (size_t j
= 0; j
< vt
->global
->expressions
.size(); ++j
)
2412 const Version_expression
& expression(vt
->global
->expressions
[j
]);
2414 // Ignore cases where we used the version because we saw a
2415 // symbol that we looked up. Note that
2416 // WAS_MATCHED_BY_SYMBOL will be true even if the symbol was
2417 // not a definition. That's OK as in that case we most
2418 // likely gave an undefined symbol error anyhow.
2419 if (expression
.was_matched_by_symbol
)
2422 // Just ignore names which are in languages other than C.
2423 // We have no way to look them up in the symbol table.
2424 if (expression
.language
!= LANGUAGE_C
)
2427 // Remove backslash quoting, and ignore wildcard patterns.
2428 std::string pattern
= expression
.pattern
;
2429 if (!expression
.exact_match
)
2431 if (this->unquote(&pattern
))
2435 if (symtab
->lookup(pattern
.c_str(), vt
->tag
.c_str()) == NULL
)
2436 gold_error(_("version script assignment of %s to symbol %s "
2437 "failed: symbol not defined"),
2438 vt
->tag
.c_str(), pattern
.c_str());
2443 struct Version_dependency_list
*
2444 Version_script_info::allocate_dependency_list()
2446 dependency_lists_
.push_back(new Version_dependency_list
);
2447 return dependency_lists_
.back();
2450 struct Version_expression_list
*
2451 Version_script_info::allocate_expression_list()
2453 expression_lists_
.push_back(new Version_expression_list
);
2454 return expression_lists_
.back();
2457 struct Version_tree
*
2458 Version_script_info::allocate_version_tree()
2460 version_trees_
.push_back(new Version_tree
);
2461 return version_trees_
.back();
2464 // Print for debugging.
2467 Version_script_info::print(FILE* f
) const
2472 fprintf(f
, "VERSION {");
2474 for (size_t i
= 0; i
< this->version_trees_
.size(); ++i
)
2476 const Version_tree
* vt
= this->version_trees_
[i
];
2478 if (vt
->tag
.empty())
2481 fprintf(f
, " %s {\n", vt
->tag
.c_str());
2483 if (vt
->global
!= NULL
)
2485 fprintf(f
, " global :\n");
2486 this->print_expression_list(f
, vt
->global
);
2489 if (vt
->local
!= NULL
)
2491 fprintf(f
, " local :\n");
2492 this->print_expression_list(f
, vt
->local
);
2496 if (vt
->dependencies
!= NULL
)
2498 const Version_dependency_list
* deps
= vt
->dependencies
;
2499 for (size_t j
= 0; j
< deps
->dependencies
.size(); ++j
)
2501 if (j
< deps
->dependencies
.size() - 1)
2503 fprintf(f
, " %s", deps
->dependencies
[j
].c_str());
2513 Version_script_info::print_expression_list(
2515 const Version_expression_list
* vel
) const
2517 Version_script_info::Language current_language
= LANGUAGE_C
;
2518 for (size_t i
= 0; i
< vel
->expressions
.size(); ++i
)
2520 const Version_expression
& ve(vel
->expressions
[i
]);
2522 if (ve
.language
!= current_language
)
2524 if (current_language
!= LANGUAGE_C
)
2526 switch (ve
.language
)
2531 fprintf(f
, " extern \"C++\" {\n");
2534 fprintf(f
, " extern \"Java\" {\n");
2539 current_language
= ve
.language
;
2543 if (current_language
!= LANGUAGE_C
)
2548 fprintf(f
, "%s", ve
.pattern
.c_str());
2555 if (current_language
!= LANGUAGE_C
)
2559 } // End namespace gold.
2561 // The remaining functions are extern "C", so it's clearer to not put
2562 // them in namespace gold.
2564 using namespace gold
;
2566 // This function is called by the bison parser to return the next
2570 yylex(YYSTYPE
* lvalp
, void* closurev
)
2572 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2573 const Token
* token
= closure
->next_token();
2574 switch (token
->classification())
2579 case Token::TOKEN_INVALID
:
2580 yyerror(closurev
, "invalid character");
2583 case Token::TOKEN_EOF
:
2586 case Token::TOKEN_STRING
:
2588 // This is either a keyword or a STRING.
2590 const char* str
= token
->string_value(&len
);
2592 switch (closure
->lex_mode())
2594 case Lex::LINKER_SCRIPT
:
2595 parsecode
= script_keywords
.keyword_to_parsecode(str
, len
);
2597 case Lex::VERSION_SCRIPT
:
2598 parsecode
= version_script_keywords
.keyword_to_parsecode(str
, len
);
2600 case Lex::DYNAMIC_LIST
:
2601 parsecode
= dynamic_list_keywords
.keyword_to_parsecode(str
, len
);
2608 lvalp
->string
.value
= str
;
2609 lvalp
->string
.length
= len
;
2613 case Token::TOKEN_QUOTED_STRING
:
2614 lvalp
->string
.value
= token
->string_value(&lvalp
->string
.length
);
2615 return QUOTED_STRING
;
2617 case Token::TOKEN_OPERATOR
:
2618 return token
->operator_value();
2620 case Token::TOKEN_INTEGER
:
2621 lvalp
->integer
= token
->integer_value();
2626 // This function is called by the bison parser to report an error.
2629 yyerror(void* closurev
, const char* message
)
2631 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2632 gold_error(_("%s:%d:%d: %s"), closure
->filename(), closure
->lineno(),
2633 closure
->charpos(), message
);
2636 // Called by the bison parser to add an external symbol to the link.
2639 script_add_extern(void* closurev
, const char* name
, size_t length
)
2641 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2642 closure
->script_options()->add_symbol_reference(name
, length
);
2645 // Called by the bison parser to add a file to the link.
2648 script_add_file(void* closurev
, const char* name
, size_t length
)
2650 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2652 // If this is an absolute path, and we found the script in the
2653 // sysroot, then we want to prepend the sysroot to the file name.
2654 // For example, this is how we handle a cross link to the x86_64
2655 // libc.so, which refers to /lib/libc.so.6.
2656 std::string
name_string(name
, length
);
2657 const char* extra_search_path
= ".";
2658 std::string script_directory
;
2659 if (IS_ABSOLUTE_PATH(name_string
.c_str()))
2661 if (closure
->is_in_sysroot())
2663 const std::string
& sysroot(parameters
->options().sysroot());
2664 gold_assert(!sysroot
.empty());
2665 name_string
= sysroot
+ name_string
;
2670 // In addition to checking the normal library search path, we
2671 // also want to check in the script-directory.
2672 const char* slash
= strrchr(closure
->filename(), '/');
2675 script_directory
.assign(closure
->filename(),
2676 slash
- closure
->filename() + 1);
2677 extra_search_path
= script_directory
.c_str();
2681 Input_file_argument
file(name_string
.c_str(),
2682 Input_file_argument::INPUT_FILE_TYPE_FILE
,
2683 extra_search_path
, false,
2684 closure
->position_dependent_options());
2685 Input_argument
& arg
= closure
->inputs()->add_file(file
);
2686 arg
.set_script_info(closure
->script_info());
2689 // Called by the bison parser to add a library to the link.
2692 script_add_library(void* closurev
, const char* name
, size_t length
)
2694 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2695 std::string
name_string(name
, length
);
2697 if (name_string
[0] != 'l')
2698 gold_error(_("library name must be prefixed with -l"));
2700 Input_file_argument
file(name_string
.c_str() + 1,
2701 Input_file_argument::INPUT_FILE_TYPE_LIBRARY
,
2703 closure
->position_dependent_options());
2704 Input_argument
& arg
= closure
->inputs()->add_file(file
);
2705 arg
.set_script_info(closure
->script_info());
2708 // Called by the bison parser to start a group. If we are already in
2709 // a group, that means that this script was invoked within a
2710 // --start-group --end-group sequence on the command line, or that
2711 // this script was found in a GROUP of another script. In that case,
2712 // we simply continue the existing group, rather than starting a new
2713 // one. It is possible to construct a case in which this will do
2714 // something other than what would happen if we did a recursive group,
2715 // but it's hard to imagine why the different behaviour would be
2716 // useful for a real program. Avoiding recursive groups is simpler
2717 // and more efficient.
2720 script_start_group(void* closurev
)
2722 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2723 if (!closure
->in_group())
2724 closure
->inputs()->start_group();
2727 // Called by the bison parser at the end of a group.
2730 script_end_group(void* closurev
)
2732 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2733 if (!closure
->in_group())
2734 closure
->inputs()->end_group();
2737 // Called by the bison parser to start an AS_NEEDED list.
2740 script_start_as_needed(void* closurev
)
2742 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2743 closure
->position_dependent_options().set_as_needed(true);
2746 // Called by the bison parser at the end of an AS_NEEDED list.
2749 script_end_as_needed(void* closurev
)
2751 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2752 closure
->position_dependent_options().set_as_needed(false);
2755 // Called by the bison parser to set the entry symbol.
2758 script_set_entry(void* closurev
, const char* entry
, size_t length
)
2760 // We'll parse this exactly the same as --entry=ENTRY on the commandline
2761 // TODO(csilvers): FIXME -- call set_entry directly.
2762 std::string
arg("--entry=");
2763 arg
.append(entry
, length
);
2764 script_parse_option(closurev
, arg
.c_str(), arg
.size());
2767 // Called by the bison parser to set whether to define common symbols.
2770 script_set_common_allocation(void* closurev
, int set
)
2772 const char* arg
= set
!= 0 ? "--define-common" : "--no-define-common";
2773 script_parse_option(closurev
, arg
, strlen(arg
));
2776 // Called by the bison parser to refer to a symbol.
2778 extern "C" Expression
*
2779 script_symbol(void* closurev
, const char* name
, size_t length
)
2781 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2782 if (length
!= 1 || name
[0] != '.')
2783 closure
->script_options()->add_symbol_reference(name
, length
);
2784 return script_exp_string(name
, length
);
2787 // Called by the bison parser to define a symbol.
2790 script_set_symbol(void* closurev
, const char* name
, size_t length
,
2791 Expression
* value
, int providei
, int hiddeni
)
2793 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2794 const bool provide
= providei
!= 0;
2795 const bool hidden
= hiddeni
!= 0;
2796 closure
->script_options()->add_symbol_assignment(name
, length
,
2797 closure
->parsing_defsym(),
2798 value
, provide
, hidden
);
2799 closure
->clear_skip_on_incompatible_target();
2802 // Called by the bison parser to add an assertion.
2805 script_add_assertion(void* closurev
, Expression
* check
, const char* message
,
2808 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2809 closure
->script_options()->add_assertion(check
, message
, messagelen
);
2810 closure
->clear_skip_on_incompatible_target();
2813 // Called by the bison parser to parse an OPTION.
2816 script_parse_option(void* closurev
, const char* option
, size_t length
)
2818 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2819 // We treat the option as a single command-line option, even if
2820 // it has internal whitespace.
2821 if (closure
->command_line() == NULL
)
2823 // There are some options that we could handle here--e.g.,
2824 // -lLIBRARY. Should we bother?
2825 gold_warning(_("%s:%d:%d: ignoring command OPTION; OPTION is only valid"
2826 " for scripts specified via -T/--script"),
2827 closure
->filename(), closure
->lineno(), closure
->charpos());
2831 bool past_a_double_dash_option
= false;
2832 const char* mutable_option
= strndup(option
, length
);
2833 gold_assert(mutable_option
!= NULL
);
2834 closure
->command_line()->process_one_option(1, &mutable_option
, 0,
2835 &past_a_double_dash_option
);
2836 // The General_options class will quite possibly store a pointer
2837 // into mutable_option, so we can't free it. In cases the class
2838 // does not store such a pointer, this is a memory leak. Alas. :(
2840 closure
->clear_skip_on_incompatible_target();
2843 // Called by the bison parser to handle OUTPUT_FORMAT. OUTPUT_FORMAT
2844 // takes either one or three arguments. In the three argument case,
2845 // the format depends on the endianness option, which we don't
2846 // currently support (FIXME). If we see an OUTPUT_FORMAT for the
2847 // wrong format, then we want to search for a new file. Returning 0
2848 // here will cause the parser to immediately abort.
2851 script_check_output_format(void* closurev
,
2852 const char* default_name
, size_t default_length
,
2853 const char*, size_t, const char*, size_t)
2855 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2856 std::string
name(default_name
, default_length
);
2857 Target
* target
= select_target_by_bfd_name(name
.c_str());
2858 if (target
== NULL
|| !parameters
->is_compatible_target(target
))
2860 if (closure
->skip_on_incompatible_target())
2862 closure
->set_found_incompatible_target();
2865 // FIXME: Should we warn about the unknown target?
2870 // Called by the bison parser to handle TARGET.
2873 script_set_target(void* closurev
, const char* target
, size_t len
)
2875 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2876 std::string
s(target
, len
);
2877 General_options::Object_format format_enum
;
2878 format_enum
= General_options::string_to_object_format(s
.c_str());
2879 closure
->position_dependent_options().set_format_enum(format_enum
);
2882 // Called by the bison parser to handle SEARCH_DIR. This is handled
2883 // exactly like a -L option.
2886 script_add_search_dir(void* closurev
, const char* option
, size_t length
)
2888 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2889 if (closure
->command_line() == NULL
)
2890 gold_warning(_("%s:%d:%d: ignoring SEARCH_DIR; SEARCH_DIR is only valid"
2891 " for scripts specified via -T/--script"),
2892 closure
->filename(), closure
->lineno(), closure
->charpos());
2893 else if (!closure
->command_line()->options().nostdlib())
2895 std::string s
= "-L" + std::string(option
, length
);
2896 script_parse_option(closurev
, s
.c_str(), s
.size());
2900 /* Called by the bison parser to push the lexer into expression
2904 script_push_lex_into_expression_mode(void* closurev
)
2906 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2907 closure
->push_lex_mode(Lex::EXPRESSION
);
2910 /* Called by the bison parser to push the lexer into version
2914 script_push_lex_into_version_mode(void* closurev
)
2916 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2917 if (closure
->version_script()->is_finalized())
2918 gold_error(_("%s:%d:%d: invalid use of VERSION in input file"),
2919 closure
->filename(), closure
->lineno(), closure
->charpos());
2920 closure
->push_lex_mode(Lex::VERSION_SCRIPT
);
2923 /* Called by the bison parser to pop the lexer mode. */
2926 script_pop_lex_mode(void* closurev
)
2928 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2929 closure
->pop_lex_mode();
2932 // Register an entire version node. For example:
2938 // - tag is "GLIBC_2.1"
2939 // - tree contains the information "global: foo"
2940 // - deps contains "GLIBC_2.0"
2943 script_register_vers_node(void*,
2946 struct Version_tree
* tree
,
2947 struct Version_dependency_list
* deps
)
2949 gold_assert(tree
!= NULL
);
2950 tree
->dependencies
= deps
;
2952 tree
->tag
= std::string(tag
, taglen
);
2955 // Add a dependencies to the list of existing dependencies, if any,
2956 // and return the expanded list.
2958 extern "C" struct Version_dependency_list
*
2959 script_add_vers_depend(void* closurev
,
2960 struct Version_dependency_list
* all_deps
,
2961 const char* depend_to_add
, int deplen
)
2963 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2964 if (all_deps
== NULL
)
2965 all_deps
= closure
->version_script()->allocate_dependency_list();
2966 all_deps
->dependencies
.push_back(std::string(depend_to_add
, deplen
));
2970 // Add a pattern expression to an existing list of expressions, if any.
2972 extern "C" struct Version_expression_list
*
2973 script_new_vers_pattern(void* closurev
,
2974 struct Version_expression_list
* expressions
,
2975 const char* pattern
, int patlen
, int exact_match
)
2977 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
2978 if (expressions
== NULL
)
2979 expressions
= closure
->version_script()->allocate_expression_list();
2980 expressions
->expressions
.push_back(
2981 Version_expression(std::string(pattern
, patlen
),
2982 closure
->get_current_language(),
2983 static_cast<bool>(exact_match
)));
2987 // Attaches b to the end of a, and clears b. So a = a + b and b = {}.
2989 extern "C" struct Version_expression_list
*
2990 script_merge_expressions(struct Version_expression_list
* a
,
2991 struct Version_expression_list
* b
)
2993 a
->expressions
.insert(a
->expressions
.end(),
2994 b
->expressions
.begin(), b
->expressions
.end());
2995 // We could delete b and remove it from expressions_lists_, but
2996 // that's a lot of work. This works just as well.
2997 b
->expressions
.clear();
3001 // Combine the global and local expressions into a a Version_tree.
3003 extern "C" struct Version_tree
*
3004 script_new_vers_node(void* closurev
,
3005 struct Version_expression_list
* global
,
3006 struct Version_expression_list
* local
)
3008 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3009 Version_tree
* tree
= closure
->version_script()->allocate_version_tree();
3010 tree
->global
= global
;
3011 tree
->local
= local
;
3015 // Handle a transition in language, such as at the
3016 // start or end of 'extern "C++"'
3019 version_script_push_lang(void* closurev
, const char* lang
, int langlen
)
3021 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3022 std::string
language(lang
, langlen
);
3023 Version_script_info::Language code
;
3024 if (language
.empty() || language
== "C")
3025 code
= Version_script_info::LANGUAGE_C
;
3026 else if (language
== "C++")
3027 code
= Version_script_info::LANGUAGE_CXX
;
3028 else if (language
== "Java")
3029 code
= Version_script_info::LANGUAGE_JAVA
;
3032 char* buf
= new char[langlen
+ 100];
3033 snprintf(buf
, langlen
+ 100,
3034 _("unrecognized version script language '%s'"),
3036 yyerror(closurev
, buf
);
3038 code
= Version_script_info::LANGUAGE_C
;
3040 closure
->push_language(code
);
3044 version_script_pop_lang(void* closurev
)
3046 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3047 closure
->pop_language();
3050 // Called by the bison parser to start a SECTIONS clause.
3053 script_start_sections(void* closurev
)
3055 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3056 closure
->script_options()->script_sections()->start_sections();
3057 closure
->clear_skip_on_incompatible_target();
3060 // Called by the bison parser to finish a SECTIONS clause.
3063 script_finish_sections(void* closurev
)
3065 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3066 closure
->script_options()->script_sections()->finish_sections();
3069 // Start processing entries for an output section.
3072 script_start_output_section(void* closurev
, const char* name
, size_t namelen
,
3073 const struct Parser_output_section_header
* header
)
3075 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3076 closure
->script_options()->script_sections()->start_output_section(name
,
3081 // Finish processing entries for an output section.
3084 script_finish_output_section(void* closurev
,
3085 const struct Parser_output_section_trailer
* trail
)
3087 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3088 closure
->script_options()->script_sections()->finish_output_section(trail
);
3091 // Add a data item (e.g., "WORD (0)") to the current output section.
3094 script_add_data(void* closurev
, int data_token
, Expression
* val
)
3096 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3098 bool is_signed
= true;
3120 closure
->script_options()->script_sections()->add_data(size
, is_signed
, val
);
3123 // Add a clause setting the fill value to the current output section.
3126 script_add_fill(void* closurev
, Expression
* val
)
3128 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3129 closure
->script_options()->script_sections()->add_fill(val
);
3132 // Add a new input section specification to the current output
3136 script_add_input_section(void* closurev
,
3137 const struct Input_section_spec
* spec
,
3140 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3141 bool keep
= keepi
!= 0;
3142 closure
->script_options()->script_sections()->add_input_section(spec
, keep
);
3145 // When we see DATA_SEGMENT_ALIGN we record that following output
3146 // sections may be relro.
3149 script_data_segment_align(void* closurev
)
3151 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3152 if (!closure
->script_options()->saw_sections_clause())
3153 gold_error(_("%s:%d:%d: DATA_SEGMENT_ALIGN not in SECTIONS clause"),
3154 closure
->filename(), closure
->lineno(), closure
->charpos());
3156 closure
->script_options()->script_sections()->data_segment_align();
3159 // When we see DATA_SEGMENT_RELRO_END we know that all output sections
3160 // since DATA_SEGMENT_ALIGN should be relro.
3163 script_data_segment_relro_end(void* closurev
)
3165 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3166 if (!closure
->script_options()->saw_sections_clause())
3167 gold_error(_("%s:%d:%d: DATA_SEGMENT_ALIGN not in SECTIONS clause"),
3168 closure
->filename(), closure
->lineno(), closure
->charpos());
3170 closure
->script_options()->script_sections()->data_segment_relro_end();
3173 // Create a new list of string/sort pairs.
3175 extern "C" String_sort_list_ptr
3176 script_new_string_sort_list(const struct Wildcard_section
* string_sort
)
3178 return new String_sort_list(1, *string_sort
);
3181 // Add an entry to a list of string/sort pairs. The way the parser
3182 // works permits us to simply modify the first parameter, rather than
3185 extern "C" String_sort_list_ptr
3186 script_string_sort_list_add(String_sort_list_ptr pv
,
3187 const struct Wildcard_section
* string_sort
)
3190 return script_new_string_sort_list(string_sort
);
3193 pv
->push_back(*string_sort
);
3198 // Create a new list of strings.
3200 extern "C" String_list_ptr
3201 script_new_string_list(const char* str
, size_t len
)
3203 return new String_list(1, std::string(str
, len
));
3206 // Add an element to a list of strings. The way the parser works
3207 // permits us to simply modify the first parameter, rather than copy
3210 extern "C" String_list_ptr
3211 script_string_list_push_back(String_list_ptr pv
, const char* str
, size_t len
)
3214 return script_new_string_list(str
, len
);
3217 pv
->push_back(std::string(str
, len
));
3222 // Concatenate two string lists. Either or both may be NULL. The way
3223 // the parser works permits us to modify the parameters, rather than
3226 extern "C" String_list_ptr
3227 script_string_list_append(String_list_ptr pv1
, String_list_ptr pv2
)
3233 pv1
->insert(pv1
->end(), pv2
->begin(), pv2
->end());
3237 // Add a new program header.
3240 script_add_phdr(void* closurev
, const char* name
, size_t namelen
,
3241 unsigned int type
, const Phdr_info
* info
)
3243 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3244 bool includes_filehdr
= info
->includes_filehdr
!= 0;
3245 bool includes_phdrs
= info
->includes_phdrs
!= 0;
3246 bool is_flags_valid
= info
->is_flags_valid
!= 0;
3247 Script_sections
* ss
= closure
->script_options()->script_sections();
3248 ss
->add_phdr(name
, namelen
, type
, includes_filehdr
, includes_phdrs
,
3249 is_flags_valid
, info
->flags
, info
->load_address
);
3250 closure
->clear_skip_on_incompatible_target();
3253 // Convert a program header string to a type.
3255 #define PHDR_TYPE(NAME) { #NAME, sizeof(#NAME) - 1, elfcpp::NAME }
3262 } phdr_type_names
[] =
3266 PHDR_TYPE(PT_DYNAMIC
),
3267 PHDR_TYPE(PT_INTERP
),
3269 PHDR_TYPE(PT_SHLIB
),
3272 PHDR_TYPE(PT_GNU_EH_FRAME
),
3273 PHDR_TYPE(PT_GNU_STACK
),
3274 PHDR_TYPE(PT_GNU_RELRO
)
3277 extern "C" unsigned int
3278 script_phdr_string_to_type(void* closurev
, const char* name
, size_t namelen
)
3280 for (unsigned int i
= 0;
3281 i
< sizeof(phdr_type_names
) / sizeof(phdr_type_names
[0]);
3283 if (namelen
== phdr_type_names
[i
].namelen
3284 && strncmp(name
, phdr_type_names
[i
].name
, namelen
) == 0)
3285 return phdr_type_names
[i
].val
;
3286 yyerror(closurev
, _("unknown PHDR type (try integer)"));
3287 return elfcpp::PT_NULL
;
3291 script_saw_segment_start_expression(void* closurev
)
3293 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3294 Script_sections
* ss
= closure
->script_options()->script_sections();
3295 ss
->set_saw_segment_start_expression(true);
3299 script_set_section_region(void* closurev
, const char* name
, size_t namelen
,
3302 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3303 if (!closure
->script_options()->saw_sections_clause())
3305 gold_error(_("%s:%d:%d: MEMORY region '%.*s' referred to outside of "
3307 closure
->filename(), closure
->lineno(), closure
->charpos(),
3308 static_cast<int>(namelen
), name
);
3312 Script_sections
* ss
= closure
->script_options()->script_sections();
3313 Memory_region
* mr
= ss
->find_memory_region(name
, namelen
);
3316 gold_error(_("%s:%d:%d: MEMORY region '%.*s' not declared"),
3317 closure
->filename(), closure
->lineno(), closure
->charpos(),
3318 static_cast<int>(namelen
), name
);
3322 ss
->set_memory_region(mr
, set_vma
);
3326 script_add_memory(void* closurev
, const char* name
, size_t namelen
,
3327 unsigned int attrs
, Expression
* origin
, Expression
* length
)
3329 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3330 Script_sections
* ss
= closure
->script_options()->script_sections();
3331 ss
->add_memory_region(name
, namelen
, attrs
, origin
, length
);
3334 extern "C" unsigned int
3335 script_parse_memory_attr(void* closurev
, const char* attrs
, size_t attrlen
,
3345 attributes
|= MEM_READABLE
; break;
3348 attributes
|= MEM_READABLE
| MEM_WRITEABLE
; break;
3351 attributes
|= MEM_EXECUTABLE
; break;
3354 attributes
|= MEM_ALLOCATABLE
; break;
3359 attributes
|= MEM_INITIALIZED
; break;
3361 yyerror(closurev
, _("unknown MEMORY attribute"));
3365 attributes
= (~ attributes
) & MEM_ATTR_MASK
;
3371 script_include_directive(int first_token
, void* closurev
,
3372 const char* filename
, size_t length
)
3374 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3375 std::string
name(filename
, length
);
3376 Command_line
* cmdline
= closure
->command_line();
3377 read_script_file(name
.c_str(), cmdline
, &cmdline
->script_options(),
3378 first_token
, Lex::LINKER_SCRIPT
);
3381 // Functions for memory regions.
3383 extern "C" Expression
*
3384 script_exp_function_origin(void* closurev
, const char* name
, size_t namelen
)
3386 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3387 Script_sections
* ss
= closure
->script_options()->script_sections();
3388 Expression
* origin
= ss
->find_memory_region_origin(name
, namelen
);
3392 gold_error(_("undefined memory region '%s' referenced "
3393 "in ORIGIN expression"),
3395 // Create a dummy expression to prevent crashes later on.
3396 origin
= script_exp_integer(0);
3402 extern "C" Expression
*
3403 script_exp_function_length(void* closurev
, const char* name
, size_t namelen
)
3405 Parser_closure
* closure
= static_cast<Parser_closure
*>(closurev
);
3406 Script_sections
* ss
= closure
->script_options()->script_sections();
3407 Expression
* length
= ss
->find_memory_region_length(name
, namelen
);
3411 gold_error(_("undefined memory region '%s' referenced "
3412 "in LENGTH expression"),
3414 // Create a dummy expression to prevent crashes later on.
3415 length
= script_exp_integer(0);