--- /dev/null
+// script.cc -- handle linker scripts for gold.
+
+// Copyright 2006, 2007, 2008, 2009 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.
+
+#include "gold.h"
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <fnmatch.h>
+#include <string>
+#include <vector>
+#include "filenames.h"
+
+#include "elfcpp.h"
+#include "demangle.h"
+#include "dirsearch.h"
+#include "options.h"
+#include "fileread.h"
+#include "workqueue.h"
+#include "readsyms.h"
+#include "parameters.h"
+#include "layout.h"
+#include "symtab.h"
+#include "target-select.h"
+#include "script.h"
+#include "script-c.h"
+#include "incremental.h"
+
+namespace gold
+{
+
+// A token read from a script file. We don't implement keywords here;
+// all keywords are simply represented as a string.
+
+class Token
+{
+ public:
+ // Token classification.
+ enum Classification
+ {
+ // Token is invalid.
+ TOKEN_INVALID,
+ // Token indicates end of input.
+ TOKEN_EOF,
+ // Token is a string of characters.
+ TOKEN_STRING,
+ // Token is a quoted string of characters.
+ TOKEN_QUOTED_STRING,
+ // Token is an operator.
+ TOKEN_OPERATOR,
+ // Token is a number (an integer).
+ TOKEN_INTEGER
+ };
+
+ // We need an empty constructor so that we can put this STL objects.
+ Token()
+ : classification_(TOKEN_INVALID), value_(NULL), value_length_(0),
+ opcode_(0), lineno_(0), charpos_(0)
+ { }
+
+ // A general token with no value.
+ Token(Classification classification, int lineno, int charpos)
+ : classification_(classification), value_(NULL), value_length_(0),
+ opcode_(0), lineno_(lineno), charpos_(charpos)
+ {
+ gold_assert(classification == TOKEN_INVALID
+ || classification == TOKEN_EOF);
+ }
+
+ // A general token with a value.
+ Token(Classification classification, const char* value, size_t length,
+ int lineno, int charpos)
+ : classification_(classification), value_(value), value_length_(length),
+ opcode_(0), lineno_(lineno), charpos_(charpos)
+ {
+ gold_assert(classification != TOKEN_INVALID
+ && classification != TOKEN_EOF);
+ }
+
+ // A token representing an operator.
+ Token(int opcode, int lineno, int charpos)
+ : classification_(TOKEN_OPERATOR), value_(NULL), value_length_(0),
+ opcode_(opcode), lineno_(lineno), charpos_(charpos)
+ { }
+
+ // Return whether the token is invalid.
+ bool
+ is_invalid() const
+ { return this->classification_ == TOKEN_INVALID; }
+
+ // Return whether this is an EOF token.
+ bool
+ is_eof() const
+ { return this->classification_ == TOKEN_EOF; }
+
+ // Return the token classification.
+ Classification
+ classification() const
+ { return this->classification_; }
+
+ // Return the line number at which the token starts.
+ int
+ lineno() const
+ { return this->lineno_; }
+
+ // Return the character position at this the token starts.
+ int
+ charpos() const
+ { return this->charpos_; }
+
+ // Get the value of a token.
+
+ const char*
+ string_value(size_t* length) const
+ {
+ gold_assert(this->classification_ == TOKEN_STRING
+ || this->classification_ == TOKEN_QUOTED_STRING);
+ *length = this->value_length_;
+ return this->value_;
+ }
+
+ int
+ operator_value() const
+ {
+ gold_assert(this->classification_ == TOKEN_OPERATOR);
+ return this->opcode_;
+ }
+
+ uint64_t
+ integer_value() const
+ {
+ gold_assert(this->classification_ == TOKEN_INTEGER);
+ // Null terminate.
+ std::string s(this->value_, this->value_length_);
+ return strtoull(s.c_str(), NULL, 0);
+ }
+
+ private:
+ // The token classification.
+ Classification classification_;
+ // The token value, for TOKEN_STRING or TOKEN_QUOTED_STRING or
+ // TOKEN_INTEGER.
+ const char* value_;
+ // The length of the token value.
+ size_t value_length_;
+ // The token value, for TOKEN_OPERATOR.
+ int opcode_;
+ // The line number where this token started (one based).
+ int lineno_;
+ // The character position within the line where this token started
+ // (one based).
+ int charpos_;
+};
+
+// This class handles lexing a file into a sequence of tokens.
+
+class Lex
+{
+ public:
+ // We unfortunately have to support different lexing modes, because
+ // when reading different parts of a linker script we need to parse
+ // things differently.
+ enum Mode
+ {
+ // Reading an ordinary linker script.
+ LINKER_SCRIPT,
+ // Reading an expression in a linker script.
+ EXPRESSION,
+ // Reading a version script.
+ VERSION_SCRIPT,
+ // Reading a --dynamic-list file.
+ DYNAMIC_LIST
+ };
+
+ Lex(const char* input_string, size_t input_length, int parsing_token)
+ : input_string_(input_string), input_length_(input_length),
+ current_(input_string), mode_(LINKER_SCRIPT),
+ first_token_(parsing_token), token_(),
+ lineno_(1), linestart_(input_string)
+ { }
+
+ // Read a file into a string.
+ static void
+ read_file(Input_file*, std::string*);
+
+ // Return the next token.
+ const Token*
+ next_token();
+
+ // Return the current lexing mode.
+ Lex::Mode
+ mode() const
+ { return this->mode_; }
+
+ // Set the lexing mode.
+ void
+ set_mode(Mode mode)
+ { this->mode_ = mode; }
+
+ private:
+ Lex(const Lex&);
+ Lex& operator=(const Lex&);
+
+ // Make a general token with no value at the current location.
+ Token
+ make_token(Token::Classification c, const char* start) const
+ { return Token(c, this->lineno_, start - this->linestart_ + 1); }
+
+ // Make a general token with a value at the current location.
+ Token
+ make_token(Token::Classification c, const char* v, size_t len,
+ const char* start)
+ const
+ { return Token(c, v, len, this->lineno_, start - this->linestart_ + 1); }
+
+ // Make an operator token at the current location.
+ Token
+ make_token(int opcode, const char* start) const
+ { return Token(opcode, this->lineno_, start - this->linestart_ + 1); }
+
+ // Make an invalid token at the current location.
+ Token
+ make_invalid_token(const char* start)
+ { return this->make_token(Token::TOKEN_INVALID, start); }
+
+ // Make an EOF token at the current location.
+ Token
+ make_eof_token(const char* start)
+ { return this->make_token(Token::TOKEN_EOF, start); }
+
+ // Return whether C can be the first character in a name. C2 is the
+ // next character, since we sometimes need that.
+ inline bool
+ can_start_name(char c, char c2);
+
+ // If C can appear in a name which has already started, return a
+ // pointer to a character later in the token or just past
+ // it. Otherwise, return NULL.
+ inline const char*
+ can_continue_name(const char* c);
+
+ // Return whether C, C2, C3 can start a hex number.
+ inline bool
+ can_start_hex(char c, char c2, char c3);
+
+ // If C can appear in a hex number which has already started, return
+ // a pointer to a character later in the token or just past
+ // it. Otherwise, return NULL.
+ inline const char*
+ can_continue_hex(const char* c);
+
+ // Return whether C can start a non-hex number.
+ static inline bool
+ can_start_number(char c);
+
+ // If C can appear in a decimal number which has already started,
+ // return a pointer to a character later in the token or just past
+ // it. Otherwise, return NULL.
+ inline const char*
+ can_continue_number(const char* c)
+ { return Lex::can_start_number(*c) ? c + 1 : NULL; }
+
+ // If C1 C2 C3 form a valid three character operator, return the
+ // opcode. Otherwise return 0.
+ static inline int
+ three_char_operator(char c1, char c2, char c3);
+
+ // If C1 C2 form a valid two character operator, return the opcode.
+ // Otherwise return 0.
+ static inline int
+ two_char_operator(char c1, char c2);
+
+ // If C1 is a valid one character operator, return the opcode.
+ // Otherwise return 0.
+ static inline int
+ one_char_operator(char c1);
+
+ // Read the next token.
+ Token
+ get_token(const char**);
+
+ // Skip a C style /* */ comment. Return false if the comment did
+ // not end.
+ bool
+ skip_c_comment(const char**);
+
+ // Skip a line # comment. Return false if there was no newline.
+ bool
+ skip_line_comment(const char**);
+
+ // Build a token CLASSIFICATION from all characters that match
+ // CAN_CONTINUE_FN. The token starts at START. Start matching from
+ // MATCH. Set *PP to the character following the token.
+ inline Token
+ gather_token(Token::Classification,
+ const char* (Lex::*can_continue_fn)(const char*),
+ const char* start, const char* match, const char** pp);
+
+ // Build a token from a quoted string.
+ Token
+ gather_quoted_string(const char** pp);
+
+ // The string we are tokenizing.
+ const char* input_string_;
+ // The length of the string.
+ size_t input_length_;
+ // The current offset into the string.
+ const char* current_;
+ // The current lexing mode.
+ Mode mode_;
+ // The code to use for the first token. This is set to 0 after it
+ // is used.
+ int first_token_;
+ // The current token.
+ Token token_;
+ // The current line number.
+ int lineno_;
+ // The start of the current line in the string.
+ const char* linestart_;
+};
+
+// Read the whole file into memory. We don't expect linker scripts to
+// be large, so we just use a std::string as a buffer. We ignore the
+// data we've already read, so that we read aligned buffers.
+
+void
+Lex::read_file(Input_file* input_file, std::string* contents)
+{
+ off_t filesize = input_file->file().filesize();
+ contents->clear();
+ contents->reserve(filesize);
+
+ off_t off = 0;
+ unsigned char buf[BUFSIZ];
+ while (off < filesize)
+ {
+ off_t get = BUFSIZ;
+ if (get > filesize - off)
+ get = filesize - off;
+ input_file->file().read(off, get, buf);
+ contents->append(reinterpret_cast<char*>(&buf[0]), get);
+ off += get;
+ }
+}
+
+// Return whether C can be the start of a name, if the next character
+// is C2. A name can being with a letter, underscore, period, or
+// dollar sign. Because a name can be a file name, we also permit
+// forward slash, backslash, and tilde. Tilde is the tricky case
+// here; GNU ld also uses it as a bitwise not operator. It is only
+// recognized as the operator if it is not immediately followed by
+// some character which can appear in a symbol. That is, when we
+// don't know that we are looking at an expression, "~0" is a file
+// name, and "~ 0" is an expression using bitwise not. We are
+// compatible.
+
+inline bool
+Lex::can_start_name(char c, char c2)
+{
+ switch (c)
+ {
+ case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+ case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
+ case 'M': case 'N': case 'O': case 'Q': case 'P': case 'R':
+ case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
+ case 'Y': case 'Z':
+ case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+ case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
+ case 'm': case 'n': case 'o': case 'q': case 'p': case 'r':
+ case 's': case 't': case 'u': case 'v': case 'w': case 'x':
+ case 'y': case 'z':
+ case '_': case '.': case '$':
+ return true;
+
+ case '/': case '\\':
+ return this->mode_ == LINKER_SCRIPT;
+
+ case '~':
+ return this->mode_ == LINKER_SCRIPT && can_continue_name(&c2);
+
+ case '*': case '[':
+ return (this->mode_ == VERSION_SCRIPT
+ || this->mode_ == DYNAMIC_LIST
+ || (this->mode_ == LINKER_SCRIPT
+ && can_continue_name(&c2)));
+
+ default:
+ return false;
+ }
+}
+
+// Return whether C can continue a name which has already started.
+// Subsequent characters in a name are the same as the leading
+// characters, plus digits and "=+-:[],?*". So in general the linker
+// script language requires spaces around operators, unless we know
+// that we are parsing an expression.
+
+inline const char*
+Lex::can_continue_name(const char* c)
+{
+ switch (*c)
+ {
+ case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+ case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
+ case 'M': case 'N': case 'O': case 'Q': case 'P': case 'R':
+ case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
+ case 'Y': case 'Z':
+ case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+ case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
+ case 'm': case 'n': case 'o': case 'q': case 'p': case 'r':
+ case 's': case 't': case 'u': case 'v': case 'w': case 'x':
+ case 'y': case 'z':
+ case '_': case '.': case '$':
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ return c + 1;
+
+ // TODO(csilvers): why not allow ~ in names for version-scripts?
+ case '/': case '\\': case '~':
+ case '=': case '+':
+ case ',':
+ if (this->mode_ == LINKER_SCRIPT)
+ return c + 1;
+ return NULL;
+
+ case '[': case ']': case '*': case '?': case '-':
+ if (this->mode_ == LINKER_SCRIPT || this->mode_ == VERSION_SCRIPT
+ || this->mode_ == DYNAMIC_LIST)
+ return c + 1;
+ return NULL;
+
+ // TODO(csilvers): why allow this? ^ is meaningless in version scripts.
+ case '^':
+ if (this->mode_ == VERSION_SCRIPT || this->mode_ == DYNAMIC_LIST)
+ return c + 1;
+ return NULL;
+
+ case ':':
+ if (this->mode_ == LINKER_SCRIPT)
+ return c + 1;
+ else if ((this->mode_ == VERSION_SCRIPT || this->mode_ == DYNAMIC_LIST)
+ && (c[1] == ':'))
+ {
+ // A name can have '::' in it, as that's a c++ namespace
+ // separator. But a single colon is not part of a name.
+ return c + 2;
+ }
+ return NULL;
+
+ default:
+ return NULL;
+ }
+}
+
+// For a number we accept 0x followed by hex digits, or any sequence
+// of digits. The old linker accepts leading '$' for hex, and
+// trailing HXBOD. Those are for MRI compatibility and we don't
+// accept them. The old linker also accepts trailing MK for mega or
+// kilo. FIXME: Those are mentioned in the documentation, and we
+// should accept them.
+
+// Return whether C1 C2 C3 can start a hex number.
+
+inline bool
+Lex::can_start_hex(char c1, char c2, char c3)
+{
+ if (c1 == '0' && (c2 == 'x' || c2 == 'X'))
+ return this->can_continue_hex(&c3);
+ return false;
+}
+
+// Return whether C can appear in a hex number.
+
+inline const char*
+Lex::can_continue_hex(const char* c)
+{
+ switch (*c)
+ {
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+ case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+ return c + 1;
+
+ default:
+ return NULL;
+ }
+}
+
+// Return whether C can start a non-hex number.
+
+inline bool
+Lex::can_start_number(char c)
+{
+ switch (c)
+ {
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ return true;
+
+ default:
+ return false;
+ }
+}
+
+// If C1 C2 C3 form a valid three character operator, return the
+// opcode (defined in the yyscript.h file generated from yyscript.y).
+// Otherwise return 0.
+
+inline int
+Lex::three_char_operator(char c1, char c2, char c3)
+{
+ switch (c1)
+ {
+ case '<':
+ if (c2 == '<' && c3 == '=')
+ return LSHIFTEQ;
+ break;
+ case '>':
+ if (c2 == '>' && c3 == '=')
+ return RSHIFTEQ;
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+// If C1 C2 form a valid two character operator, return the opcode
+// (defined in the yyscript.h file generated from yyscript.y).
+// Otherwise return 0.
+
+inline int
+Lex::two_char_operator(char c1, char c2)
+{
+ switch (c1)
+ {
+ case '=':
+ if (c2 == '=')
+ return EQ;
+ break;
+ case '!':
+ if (c2 == '=')
+ return NE;
+ break;
+ case '+':
+ if (c2 == '=')
+ return PLUSEQ;
+ break;
+ case '-':
+ if (c2 == '=')
+ return MINUSEQ;
+ break;
+ case '*':
+ if (c2 == '=')
+ return MULTEQ;
+ break;
+ case '/':
+ if (c2 == '=')
+ return DIVEQ;
+ break;
+ case '|':
+ if (c2 == '=')
+ return OREQ;
+ if (c2 == '|')
+ return OROR;
+ break;
+ case '&':
+ if (c2 == '=')
+ return ANDEQ;
+ if (c2 == '&')
+ return ANDAND;
+ break;
+ case '>':
+ if (c2 == '=')
+ return GE;
+ if (c2 == '>')
+ return RSHIFT;
+ break;
+ case '<':
+ if (c2 == '=')
+ return LE;
+ if (c2 == '<')
+ return LSHIFT;
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+// If C1 is a valid operator, return the opcode. Otherwise return 0.
+
+inline int
+Lex::one_char_operator(char c1)
+{
+ switch (c1)
+ {
+ case '+':
+ case '-':
+ case '*':
+ case '/':
+ case '%':
+ case '!':
+ case '&':
+ case '|':
+ case '^':
+ case '~':
+ case '<':
+ case '>':
+ case '=':
+ case '?':
+ case ',':
+ case '(':
+ case ')':
+ case '{':
+ case '}':
+ case '[':
+ case ']':
+ case ':':
+ case ';':
+ return c1;
+ default:
+ return 0;
+ }
+}
+
+// Skip a C style comment. *PP points to just after the "/*". Return
+// false if the comment did not end.
+
+bool
+Lex::skip_c_comment(const char** pp)
+{
+ const char* p = *pp;
+ while (p[0] != '*' || p[1] != '/')
+ {
+ if (*p == '\0')
+ {
+ *pp = p;
+ return false;
+ }
+
+ if (*p == '\n')
+ {
+ ++this->lineno_;
+ this->linestart_ = p + 1;
+ }
+ ++p;
+ }
+
+ *pp = p + 2;
+ return true;
+}
+
+// Skip a line # comment. Return false if there was no newline.
+
+bool
+Lex::skip_line_comment(const char** pp)
+{
+ const char* p = *pp;
+ size_t skip = strcspn(p, "\n");
+ if (p[skip] == '\0')
+ {
+ *pp = p + skip;
+ return false;
+ }
+
+ p += skip + 1;
+ ++this->lineno_;
+ this->linestart_ = p;
+ *pp = p;
+
+ return true;
+}
+
+// Build a token CLASSIFICATION from all characters that match
+// CAN_CONTINUE_FN. Update *PP.
+
+inline Token
+Lex::gather_token(Token::Classification classification,
+ const char* (Lex::*can_continue_fn)(const char*),
+ const char* start,
+ const char* match,
+ const char **pp)
+{
+ const char* new_match = NULL;
+ while ((new_match = (this->*can_continue_fn)(match)))
+ match = new_match;
+ *pp = match;
+ return this->make_token(classification, start, match - start, start);
+}
+
+// Build a token from a quoted string.
+
+Token
+Lex::gather_quoted_string(const char** pp)
+{
+ const char* start = *pp;
+ const char* p = start;
+ ++p;
+ size_t skip = strcspn(p, "\"\n");
+ if (p[skip] != '"')
+ return this->make_invalid_token(start);
+ *pp = p + skip + 1;
+ return this->make_token(Token::TOKEN_QUOTED_STRING, p, skip, start);
+}
+
+// Return the next token at *PP. Update *PP. General guideline: we
+// require linker scripts to be simple ASCII. No unicode linker
+// scripts. In particular we can assume that any '\0' is the end of
+// the input.
+
+Token
+Lex::get_token(const char** pp)
+{
+ const char* p = *pp;
+
+ while (true)
+ {
+ if (*p == '\0')
+ {
+ *pp = p;
+ return this->make_eof_token(p);
+ }
+
+ // Skip whitespace quickly.
+ while (*p == ' ' || *p == '\t' || *p == '\r')
+ ++p;
+
+ if (*p == '\n')
+ {
+ ++p;
+ ++this->lineno_;
+ this->linestart_ = p;
+ continue;
+ }
+
+ // Skip C style comments.
+ if (p[0] == '/' && p[1] == '*')
+ {
+ int lineno = this->lineno_;
+ int charpos = p - this->linestart_ + 1;
+
+ *pp = p + 2;
+ if (!this->skip_c_comment(pp))
+ return Token(Token::TOKEN_INVALID, lineno, charpos);
+ p = *pp;
+
+ continue;
+ }
+
+ // Skip line comments.
+ if (*p == '#')
+ {
+ *pp = p + 1;
+ if (!this->skip_line_comment(pp))
+ return this->make_eof_token(p);
+ p = *pp;
+ continue;
+ }
+
+ // Check for a name.
+ if (this->can_start_name(p[0], p[1]))
+ return this->gather_token(Token::TOKEN_STRING,
+ &Lex::can_continue_name,
+ p, p + 1, pp);
+
+ // We accept any arbitrary name in double quotes, as long as it
+ // does not cross a line boundary.
+ if (*p == '"')
+ {
+ *pp = p;
+ return this->gather_quoted_string(pp);
+ }
+
+ // Check for a number.
+
+ if (this->can_start_hex(p[0], p[1], p[2]))
+ return this->gather_token(Token::TOKEN_INTEGER,
+ &Lex::can_continue_hex,
+ p, p + 3, pp);
+
+ if (Lex::can_start_number(p[0]))
+ return this->gather_token(Token::TOKEN_INTEGER,
+ &Lex::can_continue_number,
+ p, p + 1, pp);
+
+ // Check for operators.
+
+ int opcode = Lex::three_char_operator(p[0], p[1], p[2]);
+ if (opcode != 0)
+ {
+ *pp = p + 3;
+ return this->make_token(opcode, p);
+ }
+
+ opcode = Lex::two_char_operator(p[0], p[1]);
+ if (opcode != 0)
+ {
+ *pp = p + 2;
+ return this->make_token(opcode, p);
+ }
+
+ opcode = Lex::one_char_operator(p[0]);
+ if (opcode != 0)
+ {
+ *pp = p + 1;
+ return this->make_token(opcode, p);
+ }
+
+ return this->make_token(Token::TOKEN_INVALID, p);
+ }
+}
+
+// Return the next token.
+
+const Token*
+Lex::next_token()
+{
+ // The first token is special.
+ if (this->first_token_ != 0)
+ {
+ this->token_ = Token(this->first_token_, 0, 0);
+ this->first_token_ = 0;
+ return &this->token_;
+ }
+
+ this->token_ = this->get_token(&this->current_);
+
+ // Don't let an early null byte fool us into thinking that we've
+ // reached the end of the file.
+ if (this->token_.is_eof()
+ && (static_cast<size_t>(this->current_ - this->input_string_)
+ < this->input_length_))
+ this->token_ = this->make_invalid_token(this->current_);
+
+ return &this->token_;
+}
+
+// class Symbol_assignment.
+
+// Add the symbol to the symbol table. This makes sure the symbol is
+// there and defined. The actual value is stored later. We can't
+// determine the actual value at this point, because we can't
+// necessarily evaluate the expression until all ordinary symbols have
+// been finalized.
+
+// The GNU linker lets symbol assignments in the linker script
+// silently override defined symbols in object files. We are
+// compatible. FIXME: Should we issue a warning?
+
+void
+Symbol_assignment::add_to_table(Symbol_table* symtab)
+{
+ elfcpp::STV vis = this->hidden_ ? elfcpp::STV_HIDDEN : elfcpp::STV_DEFAULT;
+ this->sym_ = symtab->define_as_constant(this->name_.c_str(),
+ NULL, // version
+ 0, // value
+ 0, // size
+ elfcpp::STT_NOTYPE,
+ elfcpp::STB_GLOBAL,
+ vis,
+ 0, // nonvis
+ this->provide_,
+ true); // force_override
+}
+
+// Finalize a symbol value.
+
+void
+Symbol_assignment::finalize(Symbol_table* symtab, const Layout* layout)
+{
+ this->finalize_maybe_dot(symtab, layout, false, 0, NULL);
+}
+
+// Finalize a symbol value which can refer to the dot symbol.
+
+void
+Symbol_assignment::finalize_with_dot(Symbol_table* symtab,
+ const Layout* layout,
+ uint64_t dot_value,
+ Output_section* dot_section)
+{
+ this->finalize_maybe_dot(symtab, layout, true, dot_value, dot_section);
+}
+
+// Finalize a symbol value, internal version.
+
+void
+Symbol_assignment::finalize_maybe_dot(Symbol_table* symtab,
+ const Layout* layout,
+ bool is_dot_available,
+ uint64_t dot_value,
+ Output_section* dot_section)
+{
+ // If we were only supposed to provide this symbol, the sym_ field
+ // will be NULL if the symbol was not referenced.
+ if (this->sym_ == NULL)
+ {
+ gold_assert(this->provide_);
+ return;
+ }
+
+ if (parameters->target().get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ this->sized_finalize<32>(symtab, layout, is_dot_available, dot_value,
+ dot_section);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->target().get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ this->sized_finalize<64>(symtab, layout, is_dot_available, dot_value,
+ dot_section);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ gold_unreachable();
+}
+
+template<int size>
+void
+Symbol_assignment::sized_finalize(Symbol_table* symtab, const Layout* layout,
+ bool is_dot_available, uint64_t dot_value,
+ Output_section* dot_section)
+{
+ Output_section* section;
+ uint64_t final_val = this->val_->eval_maybe_dot(symtab, layout, true,
+ is_dot_available,
+ dot_value, dot_section,
+ §ion);
+ Sized_symbol<size>* ssym = symtab->get_sized_symbol<size>(this->sym_);
+ ssym->set_value(final_val);
+ if (section != NULL)
+ ssym->set_output_section(section);
+}
+
+// Set the symbol value if the expression yields an absolute value.
+
+void
+Symbol_assignment::set_if_absolute(Symbol_table* symtab, const Layout* layout,
+ bool is_dot_available, uint64_t dot_value)
+{
+ if (this->sym_ == NULL)
+ return;
+
+ Output_section* val_section;
+ uint64_t val = this->val_->eval_maybe_dot(symtab, layout, false,
+ is_dot_available, dot_value,
+ NULL, &val_section);
+ if (val_section != NULL)
+ return;
+
+ if (parameters->target().get_size() == 32)
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+ Sized_symbol<32>* ssym = symtab->get_sized_symbol<32>(this->sym_);
+ ssym->set_value(val);
+#else
+ gold_unreachable();
+#endif
+ }
+ else if (parameters->target().get_size() == 64)
+ {
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+ Sized_symbol<64>* ssym = symtab->get_sized_symbol<64>(this->sym_);
+ ssym->set_value(val);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ gold_unreachable();
+}
+
+// Print for debugging.
+
+void
+Symbol_assignment::print(FILE* f) const
+{
+ if (this->provide_ && this->hidden_)
+ fprintf(f, "PROVIDE_HIDDEN(");
+ else if (this->provide_)
+ fprintf(f, "PROVIDE(");
+ else if (this->hidden_)
+ gold_unreachable();
+
+ fprintf(f, "%s = ", this->name_.c_str());
+ this->val_->print(f);
+
+ if (this->provide_ || this->hidden_)
+ fprintf(f, ")");
+
+ fprintf(f, "\n");
+}
+
+// Class Script_assertion.
+
+// Check the assertion.
+
+void
+Script_assertion::check(const Symbol_table* symtab, const Layout* layout)
+{
+ if (!this->check_->eval(symtab, layout, true))
+ gold_error("%s", this->message_.c_str());
+}
+
+// Print for debugging.
+
+void
+Script_assertion::print(FILE* f) const
+{
+ fprintf(f, "ASSERT(");
+ this->check_->print(f);
+ fprintf(f, ", \"%s\")\n", this->message_.c_str());
+}
+
+// Class Script_options.
+
+Script_options::Script_options()
+ : entry_(), symbol_assignments_(), version_script_info_(),
+ script_sections_()
+{
+}
+
+// Add a symbol to be defined.
+
+void
+Script_options::add_symbol_assignment(const char* name, size_t length,
+ Expression* value, bool provide,
+ bool hidden)
+{
+ if (length != 1 || name[0] != '.')
+ {
+ if (this->script_sections_.in_sections_clause())
+ this->script_sections_.add_symbol_assignment(name, length, value,
+ provide, hidden);
+ else
+ {
+ Symbol_assignment* p = new Symbol_assignment(name, length, value,
+ provide, hidden);
+ this->symbol_assignments_.push_back(p);
+ }
+ }
+ else
+ {
+ if (provide || hidden)
+ gold_error(_("invalid use of PROVIDE for dot symbol"));
+
+ // The GNU linker permits assignments to dot outside of SECTIONS
+ // clauses and treats them as occurring inside, so we don't
+ // check in_sections_clause here.
+ this->script_sections_.add_dot_assignment(value);
+ }
+}
+
+// Add an assertion.
+
+void
+Script_options::add_assertion(Expression* check, const char* message,
+ size_t messagelen)
+{
+ if (this->script_sections_.in_sections_clause())
+ this->script_sections_.add_assertion(check, message, messagelen);
+ else
+ {
+ Script_assertion* p = new Script_assertion(check, message, messagelen);
+ this->assertions_.push_back(p);
+ }
+}
+
+// Create sections required by any linker scripts.
+
+void
+Script_options::create_script_sections(Layout* layout)
+{
+ if (this->saw_sections_clause())
+ this->script_sections_.create_sections(layout);
+}
+
+// Add any symbols we are defining to the symbol table.
+
+void
+Script_options::add_symbols_to_table(Symbol_table* symtab)
+{
+ for (Symbol_assignments::iterator p = this->symbol_assignments_.begin();
+ p != this->symbol_assignments_.end();
+ ++p)
+ (*p)->add_to_table(symtab);
+ this->script_sections_.add_symbols_to_table(symtab);
+}
+
+// Finalize symbol values. Also check assertions.
+
+void
+Script_options::finalize_symbols(Symbol_table* symtab, const Layout* layout)
+{
+ // We finalize the symbols defined in SECTIONS first, because they
+ // are the ones which may have changed. This way if symbol outside
+ // SECTIONS are defined in terms of symbols inside SECTIONS, they
+ // will get the right value.
+ this->script_sections_.finalize_symbols(symtab, layout);
+
+ for (Symbol_assignments::iterator p = this->symbol_assignments_.begin();
+ p != this->symbol_assignments_.end();
+ ++p)
+ (*p)->finalize(symtab, layout);
+
+ for (Assertions::iterator p = this->assertions_.begin();
+ p != this->assertions_.end();
+ ++p)
+ (*p)->check(symtab, layout);
+}
+
+// Set section addresses. We set all the symbols which have absolute
+// values. Then we let the SECTIONS clause do its thing. This
+// returns the segment which holds the file header and segment
+// headers, if any.
+
+Output_segment*
+Script_options::set_section_addresses(Symbol_table* symtab, Layout* layout)
+{
+ for (Symbol_assignments::iterator p = this->symbol_assignments_.begin();
+ p != this->symbol_assignments_.end();
+ ++p)
+ (*p)->set_if_absolute(symtab, layout, false, 0);
+
+ return this->script_sections_.set_section_addresses(symtab, layout);
+}
+
+// This class holds data passed through the parser to the lexer and to
+// the parser support functions. This avoids global variables. We
+// can't use global variables because we need not be called by a
+// singleton thread.
+
+class Parser_closure
+{
+ public:
+ Parser_closure(const char* filename,
+ const Position_dependent_options& posdep_options,
+ bool in_group, bool is_in_sysroot,
+ Command_line* command_line,
+ Script_options* script_options,
+ Lex* lex,
+ bool skip_on_incompatible_target)
+ : filename_(filename), posdep_options_(posdep_options),
+ in_group_(in_group), is_in_sysroot_(is_in_sysroot),
+ skip_on_incompatible_target_(skip_on_incompatible_target),
+ found_incompatible_target_(false),
+ command_line_(command_line), script_options_(script_options),
+ version_script_info_(script_options->version_script_info()),
+ lex_(lex), lineno_(0), charpos_(0), lex_mode_stack_(), inputs_(NULL)
+ {
+ // We start out processing C symbols in the default lex mode.
+ language_stack_.push_back("");
+ lex_mode_stack_.push_back(lex->mode());
+ }
+
+ // Return the file name.
+ const char*
+ filename() const
+ { return this->filename_; }
+
+ // Return the position dependent options. The caller may modify
+ // this.
+ Position_dependent_options&
+ position_dependent_options()
+ { return this->posdep_options_; }
+
+ // Return whether this script is being run in a group.
+ bool
+ in_group() const
+ { return this->in_group_; }
+
+ // Return whether this script was found using a directory in the
+ // sysroot.
+ bool
+ is_in_sysroot() const
+ { return this->is_in_sysroot_; }
+
+ // Whether to skip to the next file with the same name if we find an
+ // incompatible target in an OUTPUT_FORMAT statement.
+ bool
+ skip_on_incompatible_target() const
+ { return this->skip_on_incompatible_target_; }
+
+ // Stop skipping to the next file on an incompatible target. This
+ // is called when we make some unrevocable change to the data
+ // structures.
+ void
+ clear_skip_on_incompatible_target()
+ { this->skip_on_incompatible_target_ = false; }
+
+ // Whether we found an incompatible target in an OUTPUT_FORMAT
+ // statement.
+ bool
+ found_incompatible_target() const
+ { return this->found_incompatible_target_; }
+
+ // Note that we found an incompatible target.
+ void
+ set_found_incompatible_target()
+ { this->found_incompatible_target_ = true; }
+
+ // Returns the Command_line structure passed in at constructor time.
+ // This value may be NULL. The caller may modify this, which modifies
+ // the passed-in Command_line object (not a copy).
+ Command_line*
+ command_line()
+ { return this->command_line_; }
+
+ // Return the options which may be set by a script.
+ Script_options*
+ script_options()
+ { return this->script_options_; }
+
+ // Return the object in which version script information should be stored.
+ Version_script_info*
+ version_script()
+ { return this->version_script_info_; }
+
+ // Return the next token, and advance.
+ const Token*
+ next_token()
+ {
+ const Token* token = this->lex_->next_token();
+ this->lineno_ = token->lineno();
+ this->charpos_ = token->charpos();
+ return token;
+ }
+
+ // Set a new lexer mode, pushing the current one.
+ void
+ push_lex_mode(Lex::Mode mode)
+ {
+ this->lex_mode_stack_.push_back(this->lex_->mode());
+ this->lex_->set_mode(mode);
+ }
+
+ // Pop the lexer mode.
+ void
+ pop_lex_mode()
+ {
+ gold_assert(!this->lex_mode_stack_.empty());
+ this->lex_->set_mode(this->lex_mode_stack_.back());
+ this->lex_mode_stack_.pop_back();
+ }
+
+ // Return the current lexer mode.
+ Lex::Mode
+ lex_mode() const
+ { return this->lex_mode_stack_.back(); }
+
+ // Return the line number of the last token.
+ int
+ lineno() const
+ { return this->lineno_; }
+
+ // Return the character position in the line of the last token.
+ int
+ charpos() const
+ { return this->charpos_; }
+
+ // Return the list of input files, creating it if necessary. This
+ // is a space leak--we never free the INPUTS_ pointer.
+ Input_arguments*
+ inputs()
+ {
+ if (this->inputs_ == NULL)
+ this->inputs_ = new Input_arguments();
+ return this->inputs_;
+ }
+
+ // Return whether we saw any input files.
+ bool
+ saw_inputs() const
+ { return this->inputs_ != NULL && !this->inputs_->empty(); }
+
+ // Return the current language being processed in a version script
+ // (eg, "C++"). The empty string represents unmangled C names.
+ const std::string&
+ get_current_language() const
+ { return this->language_stack_.back(); }
+
+ // Push a language onto the stack when entering an extern block.
+ void push_language(const std::string& lang)
+ { this->language_stack_.push_back(lang); }
+
+ // Pop a language off of the stack when exiting an extern block.
+ void pop_language()
+ {
+ gold_assert(!this->language_stack_.empty());
+ this->language_stack_.pop_back();
+ }
+
+ private:
+ // The name of the file we are reading.
+ const char* filename_;
+ // The position dependent options.
+ Position_dependent_options posdep_options_;
+ // Whether we are currently in a --start-group/--end-group.
+ bool in_group_;
+ // Whether the script was found in a sysrooted directory.
+ bool is_in_sysroot_;
+ // If this is true, then if we find an OUTPUT_FORMAT with an
+ // incompatible target, then we tell the parser to abort so that we
+ // can search for the next file with the same name.
+ bool skip_on_incompatible_target_;
+ // True if we found an OUTPUT_FORMAT with an incompatible target.
+ bool found_incompatible_target_;
+ // May be NULL if the user chooses not to pass one in.
+ Command_line* command_line_;
+ // Options which may be set from any linker script.
+ Script_options* script_options_;
+ // Information parsed from a version script.
+ Version_script_info* version_script_info_;
+ // The lexer.
+ Lex* lex_;
+ // The line number of the last token returned by next_token.
+ int lineno_;
+ // The column number of the last token returned by next_token.
+ int charpos_;
+ // A stack of lexer modes.
+ std::vector<Lex::Mode> lex_mode_stack_;
+ // A stack of which extern/language block we're inside. Can be C++,
+ // java, or empty for C.
+ std::vector<std::string> language_stack_;
+ // New input files found to add to the link.
+ Input_arguments* inputs_;
+};
+
+// FILE was found as an argument on the command line. Try to read it
+// as a script. Return true if the file was handled.
+
+bool
+read_input_script(Workqueue* workqueue, Symbol_table* symtab, Layout* layout,
+ Dirsearch* dirsearch, int dirindex,
+ Input_objects* input_objects, Mapfile* mapfile,
+ Input_group* input_group,
+ const Input_argument* input_argument,
+ Input_file* input_file, Task_token* next_blocker,
+ bool* used_next_blocker)
+{
+ *used_next_blocker = false;
+
+ std::string input_string;
+ Lex::read_file(input_file, &input_string);
+
+ Lex lex(input_string.c_str(), input_string.length(), PARSING_LINKER_SCRIPT);
+
+ Parser_closure closure(input_file->filename().c_str(),
+ input_argument->file().options(),
+ input_group != NULL,
+ input_file->is_in_sysroot(),
+ NULL,
+ layout->script_options(),
+ &lex,
+ input_file->will_search_for());
+
+ if (yyparse(&closure) != 0)
+ {
+ if (closure.found_incompatible_target())
+ {
+ Read_symbols::incompatible_warning(input_argument, input_file);
+ Read_symbols::requeue(workqueue, input_objects, symtab, layout,
+ dirsearch, dirindex, mapfile, input_argument,
+ input_group, next_blocker);
+ return true;
+ }
+ return false;
+ }
+
+ if (!closure.saw_inputs())
+ return true;
+
+ Task_token* this_blocker = NULL;
+ for (Input_arguments::const_iterator p = closure.inputs()->begin();
+ p != closure.inputs()->end();
+ ++p)
+ {
+ Task_token* nb;
+ if (p + 1 == closure.inputs()->end())
+ nb = next_blocker;
+ else
+ {
+ nb = new Task_token(true);
+ nb->add_blocker();
+ }
+ workqueue->queue_soon(new Read_symbols(input_objects, symtab,
+ layout, dirsearch, 0, mapfile, &*p,
+ input_group, this_blocker, nb));
+ this_blocker = nb;
+ }
+
+ if (layout->incremental_inputs())
+ {
+ // Like new Read_symbols(...) above, we rely on close.inputs()
+ // getting leaked by closure.
+ Script_info* info = new Script_info(closure.inputs());
+ layout->incremental_inputs()->report_script(
+ input_argument,
+ input_file->file().get_mtime(),
+ info);
+ }
+ *used_next_blocker = true;
+
+ return true;
+}
+
+// Helper function for read_version_script() and
+// read_commandline_script(). Processes the given file in the mode
+// indicated by first_token and lex_mode.
+
+static bool
+read_script_file(const char* filename, Command_line* cmdline,
+ Script_options* script_options,
+ int first_token, Lex::Mode lex_mode)
+{
+ // TODO: if filename is a relative filename, search for it manually
+ // using "." + cmdline->options()->search_path() -- not dirsearch.
+ Dirsearch dirsearch;
+
+ // The file locking code wants to record a Task, but we haven't
+ // started the workqueue yet. This is only for debugging purposes,
+ // so we invent a fake value.
+ const Task* task = reinterpret_cast<const Task*>(-1);
+
+ // We don't want this file to be opened in binary mode.
+ Position_dependent_options posdep = cmdline->position_dependent_options();
+ if (posdep.format_enum() == General_options::OBJECT_FORMAT_BINARY)
+ posdep.set_format_enum(General_options::OBJECT_FORMAT_ELF);
+ Input_file_argument input_argument(filename,
+ Input_file_argument::INPUT_FILE_TYPE_FILE,
+ "", false, posdep);
+ Input_file input_file(&input_argument);
+ int dummy = 0;
+ if (!input_file.open(dirsearch, task, &dummy))
+ return false;
+
+ std::string input_string;
+ Lex::read_file(&input_file, &input_string);
+
+ Lex lex(input_string.c_str(), input_string.length(), first_token);
+ lex.set_mode(lex_mode);
+
+ Parser_closure closure(filename,
+ cmdline->position_dependent_options(),
+ false,
+ input_file.is_in_sysroot(),
+ cmdline,
+ script_options,
+ &lex,
+ false);
+ if (yyparse(&closure) != 0)
+ {
+ input_file.file().unlock(task);
+ return false;
+ }
+
+ input_file.file().unlock(task);
+
+ gold_assert(!closure.saw_inputs());
+
+ return true;
+}
+
+// FILENAME was found as an argument to --script (-T).
+// Read it as a script, and execute its contents immediately.
+
+bool
+read_commandline_script(const char* filename, Command_line* cmdline)
+{
+ return read_script_file(filename, cmdline, &cmdline->script_options(),
+ PARSING_LINKER_SCRIPT, Lex::LINKER_SCRIPT);
+}
+
+// FILENAME was found as an argument to --version-script. Read it as
+// a version script, and store its contents in
+// cmdline->script_options()->version_script_info().
+
+bool
+read_version_script(const char* filename, Command_line* cmdline)
+{
+ return read_script_file(filename, cmdline, &cmdline->script_options(),
+ PARSING_VERSION_SCRIPT, Lex::VERSION_SCRIPT);
+}
+
+// FILENAME was found as an argument to --dynamic-list. Read it as a
+// list of symbols, and store its contents in DYNAMIC_LIST.
+
+bool
+read_dynamic_list(const char* filename, Command_line* cmdline,
+ Script_options* dynamic_list)
+{
+ return read_script_file(filename, cmdline, dynamic_list,
+ PARSING_DYNAMIC_LIST, Lex::DYNAMIC_LIST);
+}
+
+// Implement the --defsym option on the command line. Return true if
+// all is well.
+
+bool
+Script_options::define_symbol(const char* definition)
+{
+ Lex lex(definition, strlen(definition), PARSING_DEFSYM);
+ lex.set_mode(Lex::EXPRESSION);
+
+ // Dummy value.
+ Position_dependent_options posdep_options;
+
+ Parser_closure closure("command line", posdep_options, false, false, NULL,
+ this, &lex, false);
+
+ if (yyparse(&closure) != 0)
+ return false;
+
+ gold_assert(!closure.saw_inputs());
+
+ return true;
+}
+
+// Print the script to F for debugging.
+
+void
+Script_options::print(FILE* f) const
+{
+ fprintf(f, "%s: Dumping linker script\n", program_name);
+
+ if (!this->entry_.empty())
+ fprintf(f, "ENTRY(%s)\n", this->entry_.c_str());
+
+ for (Symbol_assignments::const_iterator p =
+ this->symbol_assignments_.begin();
+ p != this->symbol_assignments_.end();
+ ++p)
+ (*p)->print(f);
+
+ for (Assertions::const_iterator p = this->assertions_.begin();
+ p != this->assertions_.end();
+ ++p)
+ (*p)->print(f);
+
+ this->script_sections_.print(f);
+
+ this->version_script_info_.print(f);
+}
+
+// Manage mapping from keywords to the codes expected by the bison
+// parser. We construct one global object for each lex mode with
+// keywords.
+
+class Keyword_to_parsecode
+{
+ public:
+ // The structure which maps keywords to parsecodes.
+ struct Keyword_parsecode
+ {
+ // Keyword.
+ const char* keyword;
+ // Corresponding parsecode.
+ int parsecode;
+ };
+
+ Keyword_to_parsecode(const Keyword_parsecode* keywords,
+ int keyword_count)
+ : keyword_parsecodes_(keywords), keyword_count_(keyword_count)
+ { }
+
+ // Return the parsecode corresponding KEYWORD, or 0 if it is not a
+ // keyword.
+ int
+ keyword_to_parsecode(const char* keyword, size_t len) const;
+
+ private:
+ const Keyword_parsecode* keyword_parsecodes_;
+ const int keyword_count_;
+};
+
+// Mapping from keyword string to keyword parsecode. This array must
+// be kept in sorted order. Parsecodes are looked up using bsearch.
+// This array must correspond to the list of parsecodes in yyscript.y.
+
+static const Keyword_to_parsecode::Keyword_parsecode
+script_keyword_parsecodes[] =
+{
+ { "ABSOLUTE", ABSOLUTE },
+ { "ADDR", ADDR },
+ { "ALIGN", ALIGN_K },
+ { "ALIGNOF", ALIGNOF },
+ { "ASSERT", ASSERT_K },
+ { "AS_NEEDED", AS_NEEDED },
+ { "AT", AT },
+ { "BIND", BIND },
+ { "BLOCK", BLOCK },
+ { "BYTE", BYTE },
+ { "CONSTANT", CONSTANT },
+ { "CONSTRUCTORS", CONSTRUCTORS },
+ { "CREATE_OBJECT_SYMBOLS", CREATE_OBJECT_SYMBOLS },
+ { "DATA_SEGMENT_ALIGN", DATA_SEGMENT_ALIGN },
+ { "DATA_SEGMENT_END", DATA_SEGMENT_END },
+ { "DATA_SEGMENT_RELRO_END", DATA_SEGMENT_RELRO_END },
+ { "DEFINED", DEFINED },
+ { "ENTRY", ENTRY },
+ { "EXCLUDE_FILE", EXCLUDE_FILE },
+ { "EXTERN", EXTERN },
+ { "FILL", FILL },
+ { "FLOAT", FLOAT },
+ { "FORCE_COMMON_ALLOCATION", FORCE_COMMON_ALLOCATION },
+ { "GROUP", GROUP },
+ { "HLL", HLL },
+ { "INCLUDE", INCLUDE },
+ { "INHIBIT_COMMON_ALLOCATION", INHIBIT_COMMON_ALLOCATION },
+ { "INPUT", INPUT },
+ { "KEEP", KEEP },
+ { "LENGTH", LENGTH },
+ { "LOADADDR", LOADADDR },
+ { "LONG", LONG },
+ { "MAP", MAP },
+ { "MAX", MAX_K },
+ { "MEMORY", MEMORY },
+ { "MIN", MIN_K },
+ { "NEXT", NEXT },
+ { "NOCROSSREFS", NOCROSSREFS },
+ { "NOFLOAT", NOFLOAT },
+ { "ONLY_IF_RO", ONLY_IF_RO },
+ { "ONLY_IF_RW", ONLY_IF_RW },
+ { "OPTION", OPTION },
+ { "ORIGIN", ORIGIN },
+ { "OUTPUT", OUTPUT },
+ { "OUTPUT_ARCH", OUTPUT_ARCH },
+ { "OUTPUT_FORMAT", OUTPUT_FORMAT },
+ { "OVERLAY", OVERLAY },
+ { "PHDRS", PHDRS },
+ { "PROVIDE", PROVIDE },
+ { "PROVIDE_HIDDEN", PROVIDE_HIDDEN },
+ { "QUAD", QUAD },
+ { "SEARCH_DIR", SEARCH_DIR },
+ { "SECTIONS", SECTIONS },
+ { "SEGMENT_START", SEGMENT_START },
+ { "SHORT", SHORT },
+ { "SIZEOF", SIZEOF },
+ { "SIZEOF_HEADERS", SIZEOF_HEADERS },
+ { "SORT", SORT_BY_NAME },
+ { "SORT_BY_ALIGNMENT", SORT_BY_ALIGNMENT },
+ { "SORT_BY_NAME", SORT_BY_NAME },
+ { "SPECIAL", SPECIAL },
+ { "SQUAD", SQUAD },
+ { "STARTUP", STARTUP },
+ { "SUBALIGN", SUBALIGN },
+ { "SYSLIB", SYSLIB },
+ { "TARGET", TARGET_K },
+ { "TRUNCATE", TRUNCATE },
+ { "VERSION", VERSIONK },
+ { "global", GLOBAL },
+ { "l", LENGTH },
+ { "len", LENGTH },
+ { "local", LOCAL },
+ { "o", ORIGIN },
+ { "org", ORIGIN },
+ { "sizeof_headers", SIZEOF_HEADERS },
+};
+
+static const Keyword_to_parsecode
+script_keywords(&script_keyword_parsecodes[0],
+ (sizeof(script_keyword_parsecodes)
+ / sizeof(script_keyword_parsecodes[0])));
+
+static const Keyword_to_parsecode::Keyword_parsecode
+version_script_keyword_parsecodes[] =
+{
+ { "extern", EXTERN },
+ { "global", GLOBAL },
+ { "local", LOCAL },
+};
+
+static const Keyword_to_parsecode
+version_script_keywords(&version_script_keyword_parsecodes[0],
+ (sizeof(version_script_keyword_parsecodes)
+ / sizeof(version_script_keyword_parsecodes[0])));
+
+static const Keyword_to_parsecode::Keyword_parsecode
+dynamic_list_keyword_parsecodes[] =
+{
+ { "extern", EXTERN },
+};
+
+static const Keyword_to_parsecode
+dynamic_list_keywords(&dynamic_list_keyword_parsecodes[0],
+ (sizeof(dynamic_list_keyword_parsecodes)
+ / sizeof(dynamic_list_keyword_parsecodes[0])));
+
+
+
+// Comparison function passed to bsearch.
+
+extern "C"
+{
+
+struct Ktt_key
+{
+ const char* str;
+ size_t len;
+};
+
+static int
+ktt_compare(const void* keyv, const void* kttv)
+{
+ const Ktt_key* key = static_cast<const Ktt_key*>(keyv);
+ const Keyword_to_parsecode::Keyword_parsecode* ktt =
+ static_cast<const Keyword_to_parsecode::Keyword_parsecode*>(kttv);
+ int i = strncmp(key->str, ktt->keyword, key->len);
+ if (i != 0)
+ return i;
+ if (ktt->keyword[key->len] != '\0')
+ return -1;
+ return 0;
+}
+
+} // End extern "C".
+
+int
+Keyword_to_parsecode::keyword_to_parsecode(const char* keyword,
+ size_t len) const
+{
+ Ktt_key key;
+ key.str = keyword;
+ key.len = len;
+ void* kttv = bsearch(&key,
+ this->keyword_parsecodes_,
+ this->keyword_count_,
+ sizeof(this->keyword_parsecodes_[0]),
+ ktt_compare);
+ if (kttv == NULL)
+ return 0;
+ Keyword_parsecode* ktt = static_cast<Keyword_parsecode*>(kttv);
+ return ktt->parsecode;
+}
+
+// Helper class that calls cplus_demangle when needed and takes care of freeing
+// the result.
+
+class Lazy_demangler
+{
+ public:
+ Lazy_demangler(const char* symbol, int options)
+ : symbol_(symbol), options_(options), demangled_(NULL), did_demangle_(false)
+ { }
+
+ ~Lazy_demangler()
+ { free(this->demangled_); }
+
+ // Return the demangled name. The actual demangling happens on the first call,
+ // and the result is later cached.
+
+ inline char*
+ get();
+
+ private:
+ // The symbol to demangle.
+ const char *symbol_;
+ // Option flags to pass to cplus_demagle.
+ const int options_;
+ // The cached demangled value, or NULL if demangling didn't happen yet or
+ // failed.
+ char *demangled_;
+ // Whether we already called cplus_demangle
+ bool did_demangle_;
+};
+
+// Return the demangled name. The actual demangling happens on the first call,
+// and the result is later cached. Returns NULL if the symbol cannot be
+// demangled.
+
+inline char*
+Lazy_demangler::get()
+{
+ if (!this->did_demangle_)
+ {
+ this->demangled_ = cplus_demangle(this->symbol_, this->options_);
+ this->did_demangle_ = true;
+ }
+ return this->demangled_;
+}
+
+// The following structs are used within the VersionInfo class as well
+// as in the bison helper functions. They store the information
+// parsed from the version script.
+
+// A single version expression.
+// For example, pattern="std::map*" and language="C++".
+// pattern and language should be from the stringpool
+struct Version_expression {
+ Version_expression(const std::string& pattern,
+ const std::string& language,
+ bool exact_match)
+ : pattern(pattern), language(language), exact_match(exact_match) {}
+
+ std::string pattern;
+ std::string language;
+ // If false, we use glob() to match pattern. If true, we use strcmp().
+ bool exact_match;
+};
+
+
+// A list of expressions.
+struct Version_expression_list {
+ std::vector<struct Version_expression> expressions;
+};
+
+
+// A list of which versions upon which another version depends.
+// Strings should be from the Stringpool.
+struct Version_dependency_list {
+ std::vector<std::string> dependencies;
+};
+
+
+// The total definition of a version. It includes the tag for the
+// version, its global and local expressions, and any dependencies.
+struct Version_tree {
+ Version_tree()
+ : tag(), global(NULL), local(NULL), dependencies(NULL) {}
+
+ std::string tag;
+ const struct Version_expression_list* global;
+ const struct Version_expression_list* local;
+ const struct Version_dependency_list* dependencies;
+};
+
+Version_script_info::~Version_script_info()
+{
+ this->clear();
+}
+
+void
+Version_script_info::clear()
+{
+ for (size_t k = 0; k < dependency_lists_.size(); ++k)
+ delete dependency_lists_[k];
+ this->dependency_lists_.clear();
+ for (size_t k = 0; k < version_trees_.size(); ++k)
+ delete version_trees_[k];
+ this->version_trees_.clear();
+ for (size_t k = 0; k < expression_lists_.size(); ++k)
+ delete expression_lists_[k];
+ this->expression_lists_.clear();
+}
+
+std::vector<std::string>
+Version_script_info::get_versions() const
+{
+ std::vector<std::string> ret;
+ for (size_t j = 0; j < version_trees_.size(); ++j)
+ if (!this->version_trees_[j]->tag.empty())
+ ret.push_back(this->version_trees_[j]->tag);
+ return ret;
+}
+
+std::vector<std::string>
+Version_script_info::get_dependencies(const char* version) const
+{
+ std::vector<std::string> ret;
+ for (size_t j = 0; j < version_trees_.size(); ++j)
+ if (version_trees_[j]->tag == version)
+ {
+ const struct Version_dependency_list* deps =
+ version_trees_[j]->dependencies;
+ if (deps != NULL)
+ for (size_t k = 0; k < deps->dependencies.size(); ++k)
+ ret.push_back(deps->dependencies[k]);
+ return ret;
+ }
+ return ret;
+}
+
+// Look up SYMBOL_NAME in the list of versions. If CHECK_GLOBAL is
+// true look at the globally visible symbols, otherwise look at the
+// symbols listed as "local:". Return true if the symbol is found,
+// false otherwise. If the symbol is found, then if PVERSION is not
+// NULL, set *PVERSION to the version.
+
+bool
+Version_script_info::get_symbol_version_helper(const char* symbol_name,
+ bool check_global,
+ std::string* pversion) const
+{
+ Lazy_demangler cpp_demangled_name(symbol_name, DMGL_ANSI | DMGL_PARAMS);
+ Lazy_demangler java_demangled_name(symbol_name,
+ DMGL_ANSI | DMGL_PARAMS | DMGL_JAVA);
+ for (size_t j = 0; j < version_trees_.size(); ++j)
+ {
+ // Is it a global symbol for this version?
+ const Version_expression_list* explist =
+ check_global ? version_trees_[j]->global : version_trees_[j]->local;
+ if (explist != NULL)
+ for (size_t k = 0; k < explist->expressions.size(); ++k)
+ {
+ const char* name_to_match = symbol_name;
+ const struct Version_expression& exp = explist->expressions[k];
+ if (exp.language == "C++")
+ {
+ name_to_match = cpp_demangled_name.get();
+ // This isn't a C++ symbol.
+ if (name_to_match == NULL)
+ continue;
+ }
+ else if (exp.language == "Java")
+ {
+ name_to_match = java_demangled_name.get();
+ // This isn't a Java symbol.
+ if (name_to_match == NULL)
+ continue;
+ }
+ bool matched;
+ if (exp.exact_match)
+ matched = strcmp(exp.pattern.c_str(), name_to_match) == 0;
+ else
+ matched = fnmatch(exp.pattern.c_str(), name_to_match,
+ FNM_NOESCAPE) == 0;
+ if (matched)
+ {
+ if (pversion != NULL)
+ *pversion = this->version_trees_[j]->tag;
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+struct Version_dependency_list*
+Version_script_info::allocate_dependency_list()
+{
+ dependency_lists_.push_back(new Version_dependency_list);
+ return dependency_lists_.back();
+}
+
+struct Version_expression_list*
+Version_script_info::allocate_expression_list()
+{
+ expression_lists_.push_back(new Version_expression_list);
+ return expression_lists_.back();
+}
+
+struct Version_tree*
+Version_script_info::allocate_version_tree()
+{
+ version_trees_.push_back(new Version_tree);
+ return version_trees_.back();
+}
+
+// Print for debugging.
+
+void
+Version_script_info::print(FILE* f) const
+{
+ if (this->empty())
+ return;
+
+ fprintf(f, "VERSION {");
+
+ for (size_t i = 0; i < this->version_trees_.size(); ++i)
+ {
+ const Version_tree* vt = this->version_trees_[i];
+
+ if (vt->tag.empty())
+ fprintf(f, " {\n");
+ else
+ fprintf(f, " %s {\n", vt->tag.c_str());
+
+ if (vt->global != NULL)
+ {
+ fprintf(f, " global :\n");
+ this->print_expression_list(f, vt->global);
+ }
+
+ if (vt->local != NULL)
+ {
+ fprintf(f, " local :\n");
+ this->print_expression_list(f, vt->local);
+ }
+
+ fprintf(f, " }");
+ if (vt->dependencies != NULL)
+ {
+ const Version_dependency_list* deps = vt->dependencies;
+ for (size_t j = 0; j < deps->dependencies.size(); ++j)
+ {
+ if (j < deps->dependencies.size() - 1)
+ fprintf(f, "\n");
+ fprintf(f, " %s", deps->dependencies[j].c_str());
+ }
+ }
+ fprintf(f, ";\n");
+ }
+
+ fprintf(f, "}\n");
+}
+
+void
+Version_script_info::print_expression_list(
+ FILE* f,
+ const Version_expression_list* vel) const
+{
+ std::string current_language;
+ for (size_t i = 0; i < vel->expressions.size(); ++i)
+ {
+ const Version_expression& ve(vel->expressions[i]);
+
+ if (ve.language != current_language)
+ {
+ if (!current_language.empty())
+ fprintf(f, " }\n");
+ fprintf(f, " extern \"%s\" {\n", ve.language.c_str());
+ current_language = ve.language;
+ }
+
+ fprintf(f, " ");
+ if (!current_language.empty())
+ fprintf(f, " ");
+
+ if (ve.exact_match)
+ fprintf(f, "\"");
+ fprintf(f, "%s", ve.pattern.c_str());
+ if (ve.exact_match)
+ fprintf(f, "\"");
+
+ fprintf(f, "\n");
+ }
+
+ if (!current_language.empty())
+ fprintf(f, " }\n");
+}
+
+} // End namespace gold.
+
+// The remaining functions are extern "C", so it's clearer to not put
+// them in namespace gold.
+
+using namespace gold;
+
+// This function is called by the bison parser to return the next
+// token.
+
+extern "C" int
+yylex(YYSTYPE* lvalp, void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ const Token* token = closure->next_token();
+ switch (token->classification())
+ {
+ default:
+ gold_unreachable();
+
+ case Token::TOKEN_INVALID:
+ yyerror(closurev, "invalid character");
+ return 0;
+
+ case Token::TOKEN_EOF:
+ return 0;
+
+ case Token::TOKEN_STRING:
+ {
+ // This is either a keyword or a STRING.
+ size_t len;
+ const char* str = token->string_value(&len);
+ int parsecode = 0;
+ switch (closure->lex_mode())
+ {
+ case Lex::LINKER_SCRIPT:
+ parsecode = script_keywords.keyword_to_parsecode(str, len);
+ break;
+ case Lex::VERSION_SCRIPT:
+ parsecode = version_script_keywords.keyword_to_parsecode(str, len);
+ break;
+ case Lex::DYNAMIC_LIST:
+ parsecode = dynamic_list_keywords.keyword_to_parsecode(str, len);
+ break;
+ default:
+ break;
+ }
+ if (parsecode != 0)
+ return parsecode;
+ lvalp->string.value = str;
+ lvalp->string.length = len;
+ return STRING;
+ }
+
+ case Token::TOKEN_QUOTED_STRING:
+ lvalp->string.value = token->string_value(&lvalp->string.length);
+ return QUOTED_STRING;
+
+ case Token::TOKEN_OPERATOR:
+ return token->operator_value();
+
+ case Token::TOKEN_INTEGER:
+ lvalp->integer = token->integer_value();
+ return INTEGER;
+ }
+}
+
+// This function is called by the bison parser to report an error.
+
+extern "C" void
+yyerror(void* closurev, const char* message)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ gold_error(_("%s:%d:%d: %s"), closure->filename(), closure->lineno(),
+ closure->charpos(), message);
+}
+
+// Called by the bison parser to add an external symbol to the link.
+
+extern "C" void
+script_add_extern(void* closurev, const char* name, size_t length)
+{
+ // We treat exactly like -u NAME. FIXME: If it seems useful, we
+ // could handle this after the command line has been read, by adding
+ // entries to the symbol table directly.
+ std::string arg("--undefined=");
+ arg.append(name, length);
+ script_parse_option(closurev, arg.c_str(), arg.size());
+}
+
+// Called by the bison parser to add a file to the link.
+
+extern "C" void
+script_add_file(void* closurev, const char* name, size_t length)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+
+ // If this is an absolute path, and we found the script in the
+ // sysroot, then we want to prepend the sysroot to the file name.
+ // For example, this is how we handle a cross link to the x86_64
+ // libc.so, which refers to /lib/libc.so.6.
+ std::string name_string(name, length);
+ const char* extra_search_path = ".";
+ std::string script_directory;
+ if (IS_ABSOLUTE_PATH(name_string.c_str()))
+ {
+ if (closure->is_in_sysroot())
+ {
+ const std::string& sysroot(parameters->options().sysroot());
+ gold_assert(!sysroot.empty());
+ name_string = sysroot + name_string;
+ }
+ }
+ else
+ {
+ // In addition to checking the normal library search path, we
+ // also want to check in the script-directory.
+ const char *slash = strrchr(closure->filename(), '/');
+ if (slash != NULL)
+ {
+ script_directory.assign(closure->filename(),
+ slash - closure->filename() + 1);
+ extra_search_path = script_directory.c_str();
+ }
+ }
+
+ Input_file_argument file(name_string.c_str(),
+ Input_file_argument::INPUT_FILE_TYPE_FILE,
+ extra_search_path, false,
+ closure->position_dependent_options());
+ closure->inputs()->add_file(file);
+}
+
+// Called by the bison parser to start a group. If we are already in
+// a group, that means that this script was invoked within a
+// --start-group --end-group sequence on the command line, or that
+// this script was found in a GROUP of another script. In that case,
+// we simply continue the existing group, rather than starting a new
+// one. It is possible to construct a case in which this will do
+// something other than what would happen if we did a recursive group,
+// but it's hard to imagine why the different behaviour would be
+// useful for a real program. Avoiding recursive groups is simpler
+// and more efficient.
+
+extern "C" void
+script_start_group(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ if (!closure->in_group())
+ closure->inputs()->start_group();
+}
+
+// Called by the bison parser at the end of a group.
+
+extern "C" void
+script_end_group(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ if (!closure->in_group())
+ closure->inputs()->end_group();
+}
+
+// Called by the bison parser to start an AS_NEEDED list.
+
+extern "C" void
+script_start_as_needed(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->position_dependent_options().set_as_needed(true);
+}
+
+// Called by the bison parser at the end of an AS_NEEDED list.
+
+extern "C" void
+script_end_as_needed(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->position_dependent_options().set_as_needed(false);
+}
+
+// Called by the bison parser to set the entry symbol.
+
+extern "C" void
+script_set_entry(void* closurev, const char* entry, size_t length)
+{
+ // We'll parse this exactly the same as --entry=ENTRY on the commandline
+ // TODO(csilvers): FIXME -- call set_entry directly.
+ std::string arg("--entry=");
+ arg.append(entry, length);
+ script_parse_option(closurev, arg.c_str(), arg.size());
+}
+
+// Called by the bison parser to set whether to define common symbols.
+
+extern "C" void
+script_set_common_allocation(void* closurev, int set)
+{
+ const char* arg = set != 0 ? "--define-common" : "--no-define-common";
+ script_parse_option(closurev, arg, strlen(arg));
+}
+
+// Called by the bison parser to define a symbol.
+
+extern "C" void
+script_set_symbol(void* closurev, const char* name, size_t length,
+ Expression* value, int providei, int hiddeni)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ const bool provide = providei != 0;
+ const bool hidden = hiddeni != 0;
+ closure->script_options()->add_symbol_assignment(name, length, value,
+ provide, hidden);
+ closure->clear_skip_on_incompatible_target();
+}
+
+// Called by the bison parser to add an assertion.
+
+extern "C" void
+script_add_assertion(void* closurev, Expression* check, const char* message,
+ size_t messagelen)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->script_options()->add_assertion(check, message, messagelen);
+ closure->clear_skip_on_incompatible_target();
+}
+
+// Called by the bison parser to parse an OPTION.
+
+extern "C" void
+script_parse_option(void* closurev, const char* option, size_t length)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ // We treat the option as a single command-line option, even if
+ // it has internal whitespace.
+ if (closure->command_line() == NULL)
+ {
+ // There are some options that we could handle here--e.g.,
+ // -lLIBRARY. Should we bother?
+ gold_warning(_("%s:%d:%d: ignoring command OPTION; OPTION is only valid"
+ " for scripts specified via -T/--script"),
+ closure->filename(), closure->lineno(), closure->charpos());
+ }
+ else
+ {
+ bool past_a_double_dash_option = false;
+ const char* mutable_option = strndup(option, length);
+ gold_assert(mutable_option != NULL);
+ closure->command_line()->process_one_option(1, &mutable_option, 0,
+ &past_a_double_dash_option);
+ // The General_options class will quite possibly store a pointer
+ // into mutable_option, so we can't free it. In cases the class
+ // does not store such a pointer, this is a memory leak. Alas. :(
+ }
+ closure->clear_skip_on_incompatible_target();
+}
+
+// Called by the bison parser to handle OUTPUT_FORMAT. OUTPUT_FORMAT
+// takes either one or three arguments. In the three argument case,
+// the format depends on the endianness option, which we don't
+// currently support (FIXME). If we see an OUTPUT_FORMAT for the
+// wrong format, then we want to search for a new file. Returning 0
+// here will cause the parser to immediately abort.
+
+extern "C" int
+script_check_output_format(void* closurev,
+ const char* default_name, size_t default_length,
+ const char*, size_t, const char*, size_t)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ std::string name(default_name, default_length);
+ Target* target = select_target_by_name(name.c_str());
+ if (target == NULL || !parameters->is_compatible_target(target))
+ {
+ if (closure->skip_on_incompatible_target())
+ {
+ closure->set_found_incompatible_target();
+ return 0;
+ }
+ // FIXME: Should we warn about the unknown target?
+ }
+ return 1;
+}
+
+// Called by the bison parser to handle TARGET.
+
+extern "C" void
+script_set_target(void* closurev, const char* target, size_t len)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ std::string s(target, len);
+ General_options::Object_format format_enum;
+ format_enum = General_options::string_to_object_format(s.c_str());
+ closure->position_dependent_options().set_format_enum(format_enum);
+}
+
+// Called by the bison parser to handle SEARCH_DIR. This is handled
+// exactly like a -L option.
+
+extern "C" void
+script_add_search_dir(void* closurev, const char* option, size_t length)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ if (closure->command_line() == NULL)
+ gold_warning(_("%s:%d:%d: ignoring SEARCH_DIR; SEARCH_DIR is only valid"
+ " for scripts specified via -T/--script"),
+ closure->filename(), closure->lineno(), closure->charpos());
+ else
+ {
+ std::string s = "-L" + std::string(option, length);
+ script_parse_option(closurev, s.c_str(), s.size());
+ }
+}
+
+/* Called by the bison parser to push the lexer into expression
+ mode. */
+
+extern "C" void
+script_push_lex_into_expression_mode(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->push_lex_mode(Lex::EXPRESSION);
+}
+
+/* Called by the bison parser to push the lexer into version
+ mode. */
+
+extern "C" void
+script_push_lex_into_version_mode(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->push_lex_mode(Lex::VERSION_SCRIPT);
+}
+
+/* Called by the bison parser to pop the lexer mode. */
+
+extern "C" void
+script_pop_lex_mode(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->pop_lex_mode();
+}
+
+// Register an entire version node. For example:
+//
+// GLIBC_2.1 {
+// global: foo;
+// } GLIBC_2.0;
+//
+// - tag is "GLIBC_2.1"
+// - tree contains the information "global: foo"
+// - deps contains "GLIBC_2.0"
+
+extern "C" void
+script_register_vers_node(void*,
+ const char* tag,
+ int taglen,
+ struct Version_tree *tree,
+ struct Version_dependency_list *deps)
+{
+ gold_assert(tree != NULL);
+ tree->dependencies = deps;
+ if (tag != NULL)
+ tree->tag = std::string(tag, taglen);
+}
+
+// Add a dependencies to the list of existing dependencies, if any,
+// and return the expanded list.
+
+extern "C" struct Version_dependency_list *
+script_add_vers_depend(void* closurev,
+ struct Version_dependency_list *all_deps,
+ const char *depend_to_add, int deplen)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ if (all_deps == NULL)
+ all_deps = closure->version_script()->allocate_dependency_list();
+ all_deps->dependencies.push_back(std::string(depend_to_add, deplen));
+ return all_deps;
+}
+
+// Add a pattern expression to an existing list of expressions, if any.
+// TODO: In the old linker, the last argument used to be a bool, but I
+// don't know what it meant.
+
+extern "C" struct Version_expression_list *
+script_new_vers_pattern(void* closurev,
+ struct Version_expression_list *expressions,
+ const char *pattern, int patlen, int exact_match)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ if (expressions == NULL)
+ expressions = closure->version_script()->allocate_expression_list();
+ expressions->expressions.push_back(
+ Version_expression(std::string(pattern, patlen),
+ closure->get_current_language(),
+ static_cast<bool>(exact_match)));
+ return expressions;
+}
+
+// Attaches b to the end of a, and clears b. So a = a + b and b = {}.
+
+extern "C" struct Version_expression_list*
+script_merge_expressions(struct Version_expression_list *a,
+ struct Version_expression_list *b)
+{
+ a->expressions.insert(a->expressions.end(),
+ b->expressions.begin(), b->expressions.end());
+ // We could delete b and remove it from expressions_lists_, but
+ // that's a lot of work. This works just as well.
+ b->expressions.clear();
+ return a;
+}
+
+// Combine the global and local expressions into a a Version_tree.
+
+extern "C" struct Version_tree *
+script_new_vers_node(void* closurev,
+ struct Version_expression_list *global,
+ struct Version_expression_list *local)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ Version_tree* tree = closure->version_script()->allocate_version_tree();
+ tree->global = global;
+ tree->local = local;
+ return tree;
+}
+
+// Handle a transition in language, such as at the
+// start or end of 'extern "C++"'
+
+extern "C" void
+version_script_push_lang(void* closurev, const char* lang, int langlen)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->push_language(std::string(lang, langlen));
+}
+
+extern "C" void
+version_script_pop_lang(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->pop_language();
+}
+
+// Called by the bison parser to start a SECTIONS clause.
+
+extern "C" void
+script_start_sections(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->script_options()->script_sections()->start_sections();
+ closure->clear_skip_on_incompatible_target();
+}
+
+// Called by the bison parser to finish a SECTIONS clause.
+
+extern "C" void
+script_finish_sections(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->script_options()->script_sections()->finish_sections();
+}
+
+// Start processing entries for an output section.
+
+extern "C" void
+script_start_output_section(void* closurev, const char* name, size_t namelen,
+ const struct Parser_output_section_header* header)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->script_options()->script_sections()->start_output_section(name,
+ namelen,
+ header);
+}
+
+// Finish processing entries for an output section.
+
+extern "C" void
+script_finish_output_section(void* closurev,
+ const struct Parser_output_section_trailer* trail)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->script_options()->script_sections()->finish_output_section(trail);
+}
+
+// Add a data item (e.g., "WORD (0)") to the current output section.
+
+extern "C" void
+script_add_data(void* closurev, int data_token, Expression* val)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ int size;
+ bool is_signed = true;
+ switch (data_token)
+ {
+ case QUAD:
+ size = 8;
+ is_signed = false;
+ break;
+ case SQUAD:
+ size = 8;
+ break;
+ case LONG:
+ size = 4;
+ break;
+ case SHORT:
+ size = 2;
+ break;
+ case BYTE:
+ size = 1;
+ break;
+ default:
+ gold_unreachable();
+ }
+ closure->script_options()->script_sections()->add_data(size, is_signed, val);
+}
+
+// Add a clause setting the fill value to the current output section.
+
+extern "C" void
+script_add_fill(void* closurev, Expression* val)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ closure->script_options()->script_sections()->add_fill(val);
+}
+
+// Add a new input section specification to the current output
+// section.
+
+extern "C" void
+script_add_input_section(void* closurev,
+ const struct Input_section_spec* spec,
+ int keepi)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ bool keep = keepi != 0;
+ closure->script_options()->script_sections()->add_input_section(spec, keep);
+}
+
+// When we see DATA_SEGMENT_ALIGN we record that following output
+// sections may be relro.
+
+extern "C" void
+script_data_segment_align(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ if (!closure->script_options()->saw_sections_clause())
+ gold_error(_("%s:%d:%d: DATA_SEGMENT_ALIGN not in SECTIONS clause"),
+ closure->filename(), closure->lineno(), closure->charpos());
+ else
+ closure->script_options()->script_sections()->data_segment_align();
+}
+
+// When we see DATA_SEGMENT_RELRO_END we know that all output sections
+// since DATA_SEGMENT_ALIGN should be relro.
+
+extern "C" void
+script_data_segment_relro_end(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ if (!closure->script_options()->saw_sections_clause())
+ gold_error(_("%s:%d:%d: DATA_SEGMENT_ALIGN not in SECTIONS clause"),
+ closure->filename(), closure->lineno(), closure->charpos());
+ else
+ closure->script_options()->script_sections()->data_segment_relro_end();
+}
+
+// Create a new list of string/sort pairs.
+
+extern "C" String_sort_list_ptr
+script_new_string_sort_list(const struct Wildcard_section* string_sort)
+{
+ return new String_sort_list(1, *string_sort);
+}
+
+// Add an entry to a list of string/sort pairs. The way the parser
+// works permits us to simply modify the first parameter, rather than
+// copy the vector.
+
+extern "C" String_sort_list_ptr
+script_string_sort_list_add(String_sort_list_ptr pv,
+ const struct Wildcard_section* string_sort)
+{
+ if (pv == NULL)
+ return script_new_string_sort_list(string_sort);
+ else
+ {
+ pv->push_back(*string_sort);
+ return pv;
+ }
+}
+
+// Create a new list of strings.
+
+extern "C" String_list_ptr
+script_new_string_list(const char* str, size_t len)
+{
+ return new String_list(1, std::string(str, len));
+}
+
+// Add an element to a list of strings. The way the parser works
+// permits us to simply modify the first parameter, rather than copy
+// the vector.
+
+extern "C" String_list_ptr
+script_string_list_push_back(String_list_ptr pv, const char* str, size_t len)
+{
+ if (pv == NULL)
+ return script_new_string_list(str, len);
+ else
+ {
+ pv->push_back(std::string(str, len));
+ return pv;
+ }
+}
+
+// Concatenate two string lists. Either or both may be NULL. The way
+// the parser works permits us to modify the parameters, rather than
+// copy the vector.
+
+extern "C" String_list_ptr
+script_string_list_append(String_list_ptr pv1, String_list_ptr pv2)
+{
+ if (pv1 == NULL)
+ return pv2;
+ if (pv2 == NULL)
+ return pv1;
+ pv1->insert(pv1->end(), pv2->begin(), pv2->end());
+ return pv1;
+}
+
+// Add a new program header.
+
+extern "C" void
+script_add_phdr(void* closurev, const char* name, size_t namelen,
+ unsigned int type, const Phdr_info* info)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ bool includes_filehdr = info->includes_filehdr != 0;
+ bool includes_phdrs = info->includes_phdrs != 0;
+ bool is_flags_valid = info->is_flags_valid != 0;
+ Script_sections* ss = closure->script_options()->script_sections();
+ ss->add_phdr(name, namelen, type, includes_filehdr, includes_phdrs,
+ is_flags_valid, info->flags, info->load_address);
+ closure->clear_skip_on_incompatible_target();
+}
+
+// Convert a program header string to a type.
+
+#define PHDR_TYPE(NAME) { #NAME, sizeof(#NAME) - 1, elfcpp::NAME }
+
+static struct
+{
+ const char* name;
+ size_t namelen;
+ unsigned int val;
+} phdr_type_names[] =
+{
+ PHDR_TYPE(PT_NULL),
+ PHDR_TYPE(PT_LOAD),
+ PHDR_TYPE(PT_DYNAMIC),
+ PHDR_TYPE(PT_INTERP),
+ PHDR_TYPE(PT_NOTE),
+ PHDR_TYPE(PT_SHLIB),
+ PHDR_TYPE(PT_PHDR),
+ PHDR_TYPE(PT_TLS),
+ PHDR_TYPE(PT_GNU_EH_FRAME),
+ PHDR_TYPE(PT_GNU_STACK),
+ PHDR_TYPE(PT_GNU_RELRO)
+};
+
+extern "C" unsigned int
+script_phdr_string_to_type(void* closurev, const char* name, size_t namelen)
+{
+ for (unsigned int i = 0;
+ i < sizeof(phdr_type_names) / sizeof(phdr_type_names[0]);
+ ++i)
+ if (namelen == phdr_type_names[i].namelen
+ && strncmp(name, phdr_type_names[i].name, namelen) == 0)
+ return phdr_type_names[i].val;
+ yyerror(closurev, _("unknown PHDR type (try integer)"));
+ return elfcpp::PT_NULL;
+}
projects / msp430-binutils.git / blobdiff