// script.cc -- handle linker scripts for gold.
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include "gold.h"
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
#include <fnmatch.h>
#include <string>
#include <vector>
-#include <cstdio>
-#include <cstdlib>
#include "filenames.h"
#include "elfcpp.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
{
// Reading an expression in a linker script.
EXPRESSION,
// Reading a version script.
- VERSION_SCRIPT
+ VERSION_SCRIPT,
+ // Reading a --dynamic-list file.
+ DYNAMIC_LIST
};
Lex(const char* input_string, size_t input_length, int parsing_token)
case '~':
return this->mode_ == LINKER_SCRIPT && can_continue_name(&c2);
- case '*': case '[':
+ case '*': case '[':
return (this->mode_ == VERSION_SCRIPT
+ || this->mode_ == DYNAMIC_LIST
|| (this->mode_ == LINKER_SCRIPT
&& can_continue_name(&c2)));
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 ',': case '?':
+ case ',':
if (this->mode_ == LINKER_SCRIPT)
return c + 1;
return NULL;
- case '[': case ']': case '*': case '-':
- if (this->mode_ == LINKER_SCRIPT || this->mode_ == VERSION_SCRIPT)
+ 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)
+ 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 && (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.
}
// Skip whitespace quickly.
- while (*p == ' ' || *p == '\t')
+ while (*p == ' ' || *p == '\t' || *p == '\r')
++p;
if (*p == '\n')
elfcpp::STV vis = this->hidden_ ? elfcpp::STV_HIDDEN : elfcpp::STV_DEFAULT;
this->sym_ = symtab->define_as_constant(this->name_.c_str(),
NULL, // version
+ (this->is_defsym_
+ ? Symbol_table::DEFSYM
+ : Symbol_table::SCRIPT),
0, // value
0, // size
elfcpp::STT_NOTYPE,
uint64_t final_val = this->val_->eval_maybe_dot(symtab, layout, true,
is_dot_available,
dot_value, dot_section,
- §ion);
+ §ion, NULL);
Sized_symbol<size>* ssym = symtab->get_sized_symbol<size>(this->sym_);
ssym->set_value(final_val);
if (section != NULL)
Output_section* val_section;
uint64_t val = this->val_->eval_maybe_dot(symtab, layout, false,
is_dot_available, dot_value,
- NULL, &val_section);
+ NULL, &val_section, NULL);
if (val_section != NULL)
return;
void
Script_options::add_symbol_assignment(const char* name, size_t length,
- Expression* value, bool provide,
- bool hidden)
+ bool is_defsym, 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,
+ gold_assert(!is_defsym);
+ this->script_sections_.add_symbol_assignment(name, length, value,
provide, hidden);
+ }
+ else
+ {
+ Symbol_assignment* p = new Symbol_assignment(name, length, is_defsym,
+ value, provide, hidden);
this->symbol_assignments_.push_back(p);
}
}
{
if (provide || hidden)
gold_error(_("invalid use of PROVIDE for dot symbol"));
- if (!this->script_sections_.in_sections_clause())
- gold_error(_("invalid assignment to dot outside of SECTIONS"));
- else
- this->script_sections_.add_dot_assignment(value);
+
+ // 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);
}
}
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 != this->assertions_.end();
++p)
(*p)->check(symtab, layout);
-
- this->script_sections_.finalize_symbols(symtab, layout);
}
// Set section addresses. We set all the symbols which have absolute
public:
Parser_closure(const char* filename,
const Position_dependent_options& posdep_options,
- bool in_group, bool is_in_sysroot,
+ bool parsing_defsym, bool in_group, bool is_in_sysroot,
Command_line* command_line,
Script_options* script_options,
- Lex* lex)
+ Lex* lex,
+ bool skip_on_incompatible_target)
: filename_(filename), posdep_options_(posdep_options),
- in_group_(in_group), is_in_sysroot_(is_in_sysroot),
+ parsing_defsym_(parsing_defsym), 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());
+ this->language_stack_.push_back(Version_script_info::LANGUAGE_C);
+ this->lex_mode_stack_.push_back(lex->mode());
}
// Return the file name.
position_dependent_options()
{ return this->posdep_options_; }
+ // Whether we are parsing a --defsym.
+ bool
+ parsing_defsym() const
+ { return this->parsing_defsym_; }
+
// Return whether this script is being run in a group.
bool
in_group() const
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).
// Return the current language being processed in a version script
// (eg, "C++"). The empty string represents unmangled C names.
- const std::string&
+ Version_script_info::Language
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)
+ void
+ push_language(Version_script_info::Language lang)
{ this->language_stack_.push_back(lang); }
// Pop a language off of the stack when exiting an extern block.
- void pop_language()
+ void
+ pop_language()
{
gold_assert(!this->language_stack_.empty());
this->language_stack_.pop_back();
const char* filename_;
// The position dependent options.
Position_dependent_options posdep_options_;
+ // True if we are parsing a --defsym.
+ bool parsing_defsym_;
// 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.
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_;
+ std::vector<Version_script_info::Language> language_stack_;
// New input files found to add to the link.
Input_arguments* inputs_;
};
// as a script. Return true if the file was handled.
bool
-read_input_script(Workqueue* workqueue, const General_options& options,
- Symbol_table* symtab, Layout* layout,
- Dirsearch* dirsearch, Input_objects* input_objects,
+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,
Parser_closure closure(input_file->filename().c_str(),
input_argument->file().options(),
+ false,
input_group != NULL,
input_file->is_in_sysroot(),
NULL,
layout->script_options(),
- &lex);
+ &lex,
+ input_file->will_search_for());
+
+ bool old_saw_sections_clause =
+ layout->script_options()->saw_sections_clause();
if (yyparse(&closure) != 0)
- return false;
+ {
+ 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 (!old_saw_sections_clause
+ && layout->script_options()->saw_sections_clause()
+ && layout->have_added_input_section())
+ gold_error(_("%s: SECTIONS seen after other input files; try -T/--script"),
+ input_file->filename().c_str());
if (!closure.saw_inputs())
return true;
nb = new Task_token(true);
nb->add_blocker();
}
- workqueue->queue_soon(new Read_symbols(options, input_objects, symtab,
- layout, dirsearch, &*p,
- input_group, this_blocker, nb));
+ workqueue->queue_soon(new Read_symbols(input_objects, symtab,
+ layout, dirsearch, 0, mapfile, &*p,
+ input_group, NULL, 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;
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
// We don't want this file to be opened in binary mode.
Position_dependent_options posdep = cmdline->position_dependent_options();
- if (posdep.format() == General_options::OBJECT_FORMAT_BINARY)
- posdep.set_format("elf");
- Input_file_argument input_argument(filename, false, "", false, posdep);
+ 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);
- if (!input_file.open(cmdline->options(), dirsearch, task))
+ int dummy = 0;
+ if (!input_file.open(dirsearch, task, &dummy))
return false;
std::string input_string;
Parser_closure closure(filename,
cmdline->position_dependent_options(),
+ first_token == Lex::DYNAMIC_LIST,
false,
input_file.is_in_sysroot(),
cmdline,
- &cmdline->script_options(),
- &lex);
+ script_options,
+ &lex,
+ false);
if (yyparse(&closure) != 0)
{
input_file.file().unlock(task);
bool
read_commandline_script(const char* filename, Command_line* cmdline)
{
- return read_script_file(filename, cmdline,
+ return read_script_file(filename, cmdline, &cmdline->script_options(),
PARSING_LINKER_SCRIPT, Lex::LINKER_SCRIPT);
}
-// FILE was found as an argument to --version-script. Read it as a
-// version script, and store its contents in
+// 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,
+ 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.
// Dummy value.
Position_dependent_options posdep_options;
- Parser_closure closure("command line", posdep_options, false, false, NULL,
- this, &lex);
+ Parser_closure closure("command line", posdep_options, true,
+ false, false, NULL, this, &lex, false);
if (yyparse(&closure) != 0)
return false;
{ "BYTE", BYTE },
{ "CONSTANT", CONSTANT },
{ "CONSTRUCTORS", CONSTRUCTORS },
+ { "COPY", COPY },
{ "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 },
+ { "DSECT", DSECT },
{ "ENTRY", ENTRY },
{ "EXCLUDE_FILE", EXCLUDE_FILE },
{ "EXTERN", EXTERN },
{ "GROUP", GROUP },
{ "HLL", HLL },
{ "INCLUDE", INCLUDE },
+ { "INFO", INFO },
{ "INHIBIT_COMMON_ALLOCATION", INHIBIT_COMMON_ALLOCATION },
{ "INPUT", INPUT },
{ "KEEP", KEEP },
{ "NEXT", NEXT },
{ "NOCROSSREFS", NOCROSSREFS },
{ "NOFLOAT", NOFLOAT },
+ { "NOLOAD", NOLOAD },
{ "ONLY_IF_RO", ONLY_IF_RO },
{ "ONLY_IF_RW", ONLY_IF_RW },
{ "OPTION", OPTION },
(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"
// 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) {}
+struct Version_expression
+{
+ Version_expression(const std::string& a_pattern,
+ Version_script_info::Language a_language,
+ bool a_exact_match)
+ : pattern(a_pattern), language(a_language), exact_match(a_exact_match),
+ was_matched_by_symbol(false)
+ { }
std::string pattern;
- std::string language;
+ Version_script_info::Language language;
// If false, we use glob() to match pattern. If true, we use strcmp().
bool exact_match;
+ // True if --no-undefined-version is in effect and we found this
+ // version in get_symbol_version. We use mutable because this
+ // struct is generally not modifiable after it has been created.
+ mutable bool was_matched_by_symbol;
};
-
// A list of expressions.
-struct Version_expression_list {
+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 {
+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 {
+struct Version_tree
+{
Version_tree()
- : tag(), global(NULL), local(NULL), dependencies(NULL) {}
+ : tag(), global(NULL), local(NULL), dependencies(NULL)
+ { }
std::string tag;
const struct Version_expression_list* global;
const struct Version_dependency_list* dependencies;
};
+// 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_;
+}
+
+// Class Version_script_info.
+
+Version_script_info::Version_script_info()
+ : dependency_lists_(), expression_lists_(), version_trees_(), globs_(),
+ default_version_(NULL), default_is_global_(false), is_finalized_(false)
+{
+ for (int i = 0; i < LANGUAGE_COUNT; ++i)
+ this->exact_[i] = NULL;
+}
+
Version_script_info::~Version_script_info()
{
- this->clear();
}
+// Forget all the known version script information.
+
void
Version_script_info::clear()
{
- for (size_t k = 0; k < dependency_lists_.size(); ++k)
- delete dependency_lists_[k];
+ for (size_t k = 0; k < this->dependency_lists_.size(); ++k)
+ delete this->dependency_lists_[k];
this->dependency_lists_.clear();
- for (size_t k = 0; k < version_trees_.size(); ++k)
- delete version_trees_[k];
+ for (size_t k = 0; k < this->version_trees_.size(); ++k)
+ delete this->version_trees_[k];
this->version_trees_.clear();
- for (size_t k = 0; k < expression_lists_.size(); ++k)
- delete expression_lists_[k];
+ for (size_t k = 0; k < this->expression_lists_.size(); ++k)
+ delete this->expression_lists_[k];
this->expression_lists_.clear();
}
+// Finalize the version script information.
+
+void
+Version_script_info::finalize()
+{
+ if (!this->is_finalized_)
+ {
+ this->build_lookup_tables();
+ this->is_finalized_ = true;
+ }
+}
+
+// Return all the versions.
+
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)
- ret.push_back(version_trees_[j]->tag);
+ for (size_t j = 0; j < this->version_trees_.size(); ++j)
+ if (!this->version_trees_[j]->tag.empty())
+ ret.push_back(this->version_trees_[j]->tag);
return ret;
}
+// Return the dependencies of VERSION.
+
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)
+ for (size_t j = 0; j < this->version_trees_.size(); ++j)
+ if (this->version_trees_[j]->tag == version)
{
const struct Version_dependency_list* deps =
- version_trees_[j]->dependencies;
+ this->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;
}
-const std::string&
-Version_script_info::get_symbol_version_helper(const char* symbol_name,
- bool check_global) const
+// A version script essentially maps a symbol name to a version tag
+// and an indication of whether symbol is global or local within that
+// version tag. Each symbol maps to at most one version tag.
+// Unfortunately, in practice, version scripts are ambiguous, and list
+// symbols multiple times. Thus, we have to document the matching
+// process.
+
+// This is a description of what the GNU linker does as of 2010-01-11.
+// It walks through the version tags in the order in which they appear
+// in the version script. For each tag, it first walks through the
+// global patterns for that tag, then the local patterns. When
+// looking at a single pattern, it first applies any language specific
+// demangling as specified for the pattern, and then matches the
+// resulting symbol name to the pattern. If it finds an exact match
+// for a literal pattern (a pattern enclosed in quotes or with no
+// wildcard characters), then that is the match that it uses. If
+// finds a match with a wildcard pattern, then it saves it and
+// continues searching. Wildcard patterns that are exactly "*" are
+// saved separately.
+
+// If no exact match with a literal pattern is ever found, then if a
+// wildcard match with a global pattern was found it is used,
+// otherwise if a wildcard match with a local pattern was found it is
+// used.
+
+// This is the result:
+// * If there is an exact match, then we use the first tag in the
+// version script where it matches.
+// + If the exact match in that tag is global, it is used.
+// + Otherwise the exact match in that tag is local, and is used.
+// * Otherwise, if there is any match with a global wildcard pattern:
+// + If there is any match with a wildcard pattern which is not
+// "*", then we use the tag in which the *last* such pattern
+// appears.
+// + Otherwise, we matched "*". If there is no match with a local
+// wildcard pattern which is not "*", then we use the *last*
+// match with a global "*". Otherwise, continue.
+// * Otherwise, if there is any match with a local wildcard pattern:
+// + If there is any match with a wildcard pattern which is not
+// "*", then we use the tag in which the *last* such pattern
+// appears.
+// + Otherwise, we matched "*", and we use the tag in which the
+// *last* such match occurred.
+
+// There is an additional wrinkle. When the GNU linker finds a symbol
+// with a version defined in an object file due to a .symver
+// directive, it looks up that symbol name in that version tag. If it
+// finds it, it matches the symbol name against the patterns for that
+// version. If there is no match with a global pattern, but there is
+// a match with a local pattern, then the GNU linker marks the symbol
+// as local.
+
+// We want gold to be generally compatible, but we also want gold to
+// be fast. These are the rules that gold implements:
+// * If there is an exact match for the mangled name, we use it.
+// + If there is more than one exact match, we give a warning, and
+// we use the first tag in the script which matches.
+// + If a symbol has an exact match as both global and local for
+// the same version tag, we give an error.
+// * Otherwise, we look for an extern C++ or an extern Java exact
+// match. If we find an exact match, we use it.
+// + If there is more than one exact match, we give a warning, and
+// we use the first tag in the script which matches.
+// + If a symbol has an exact match as both global and local for
+// the same version tag, we give an error.
+// * Otherwise, we look through the wildcard patterns, ignoring "*"
+// patterns. We look through the version tags in reverse order.
+// For each version tag, we look through the global patterns and
+// then the local patterns. We use the first match we find (i.e.,
+// the last matching version tag in the file).
+// * Otherwise, we use the "*" pattern if there is one. We give an
+// error if there are multiple "*" patterns.
+
+// At least for now, gold does not look up the version tag for a
+// symbol version found in an object file to see if it should be
+// forced local. There are other ways to force a symbol to be local,
+// and I don't understand why this one is useful.
+
+// Build a set of fast lookup tables for a version script.
+
+void
+Version_script_info::build_lookup_tables()
+{
+ size_t size = this->version_trees_.size();
+ for (size_t j = 0; j < size; ++j)
+ {
+ const Version_tree* v = this->version_trees_[j];
+ this->build_expression_list_lookup(v->local, v, false);
+ this->build_expression_list_lookup(v->global, v, true);
+ }
+}
+
+// If a pattern has backlashes but no unquoted wildcard characters,
+// then we apply backslash unquoting and look for an exact match.
+// Otherwise we treat it as a wildcard pattern. This function returns
+// true for a wildcard pattern. Otherwise, it does backslash
+// unquoting on *PATTERN and returns false. If this returns true,
+// *PATTERN may have been partially unquoted.
+
+bool
+Version_script_info::unquote(std::string* pattern) const
{
- for (size_t j = 0; j < version_trees_.size(); ++j)
+ bool saw_backslash = false;
+ size_t len = pattern->length();
+ size_t j = 0;
+ for (size_t i = 0; i < len; ++i)
{
- // 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];
- char* demangled_name = NULL;
- if (exp.language == "C++")
- {
- demangled_name = cplus_demangle(symbol_name,
- DMGL_ANSI | DMGL_PARAMS);
- // This isn't a C++ symbol.
- if (demangled_name == NULL)
- continue;
- name_to_match = demangled_name;
- }
- else if (exp.language == "Java")
- {
- demangled_name = cplus_demangle(symbol_name,
- (DMGL_ANSI | DMGL_PARAMS
- | DMGL_JAVA));
- // This isn't a Java symbol.
- if (demangled_name == NULL)
- continue;
- name_to_match = demangled_name;
- }
- 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 (demangled_name != NULL)
- free(demangled_name);
- if (matched)
- return version_trees_[j]->tag;
- }
+ if (saw_backslash)
+ saw_backslash = false;
+ else
+ {
+ switch ((*pattern)[i])
+ {
+ case '?': case '[': case '*':
+ return true;
+ case '\\':
+ saw_backslash = true;
+ continue;
+ default:
+ break;
+ }
+ }
+
+ if (i != j)
+ (*pattern)[j] = (*pattern)[i];
+ ++j;
+ }
+ return false;
+}
+
+// Add an exact match for MATCH to *PE. The result of the match is
+// V/IS_GLOBAL.
+
+void
+Version_script_info::add_exact_match(const std::string& match,
+ const Version_tree* v, bool is_global,
+ const Version_expression* ve,
+ Exact *pe)
+{
+ std::pair<Exact::iterator, bool> ins =
+ pe->insert(std::make_pair(match, Version_tree_match(v, is_global, ve)));
+ if (ins.second)
+ {
+ // This is the first time we have seen this match.
+ return;
+ }
+
+ Version_tree_match& vtm(ins.first->second);
+ if (vtm.real->tag != v->tag)
+ {
+ // This is an ambiguous match. We still return the
+ // first version that we found in the script, but we
+ // record the new version to issue a warning if we
+ // wind up looking up this symbol.
+ if (vtm.ambiguous == NULL)
+ vtm.ambiguous = v;
+ }
+ else if (is_global != vtm.is_global)
+ {
+ // We have a match for both the global and local entries for a
+ // version tag. That's got to be wrong.
+ gold_error(_("'%s' appears as both a global and a local symbol "
+ "for version '%s' in script"),
+ match.c_str(), v->tag.c_str());
+ }
+}
+
+// Build fast lookup information for EXPLIST and store it in LOOKUP.
+// All matches go to V, and IS_GLOBAL is true if they are global
+// matches.
+
+void
+Version_script_info::build_expression_list_lookup(
+ const Version_expression_list* explist,
+ const Version_tree* v,
+ bool is_global)
+{
+ if (explist == NULL)
+ return;
+ size_t size = explist->expressions.size();
+ for (size_t i = 0; i < size; ++i)
+ {
+ const Version_expression& exp(explist->expressions[i]);
+
+ if (exp.pattern.length() == 1 && exp.pattern[0] == '*')
+ {
+ if (this->default_version_ != NULL
+ && this->default_version_->tag != v->tag)
+ gold_warning(_("wildcard match appears in both version '%s' "
+ "and '%s' in script"),
+ this->default_version_->tag.c_str(), v->tag.c_str());
+ else if (this->default_version_ != NULL
+ && this->default_is_global_ != is_global)
+ gold_error(_("wildcard match appears as both global and local "
+ "in version '%s' in script"),
+ v->tag.c_str());
+ this->default_version_ = v;
+ this->default_is_global_ = is_global;
+ continue;
+ }
+
+ std::string pattern = exp.pattern;
+ if (!exp.exact_match)
+ {
+ if (this->unquote(&pattern))
+ {
+ this->globs_.push_back(Glob(&exp, v, is_global));
+ continue;
+ }
+ }
+
+ if (this->exact_[exp.language] == NULL)
+ this->exact_[exp.language] = new Exact();
+ this->add_exact_match(pattern, v, is_global, &exp,
+ this->exact_[exp.language]);
+ }
+}
+
+// Return the name to match given a name, a language code, and two
+// lazy demanglers.
+
+const char*
+Version_script_info::get_name_to_match(const char* name,
+ int language,
+ Lazy_demangler* cpp_demangler,
+ Lazy_demangler* java_demangler) const
+{
+ switch (language)
+ {
+ case LANGUAGE_C:
+ return name;
+ case LANGUAGE_CXX:
+ return cpp_demangler->get();
+ case LANGUAGE_JAVA:
+ return java_demangler->get();
+ default:
+ gold_unreachable();
+ }
+}
+
+// Look up SYMBOL_NAME in the list of versions. Return true if the
+// symbol is found, false if not. If the symbol is found, then if
+// PVERSION is not NULL, set *PVERSION to the version tag, and if
+// P_IS_GLOBAL is not NULL, set *P_IS_GLOBAL according to whether the
+// symbol is global or not.
+
+bool
+Version_script_info::get_symbol_version(const char* symbol_name,
+ std::string* pversion,
+ bool* p_is_global) 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);
+
+ gold_assert(this->is_finalized_);
+ for (int i = 0; i < LANGUAGE_COUNT; ++i)
+ {
+ Exact* exact = this->exact_[i];
+ if (exact == NULL)
+ continue;
+
+ const char* name_to_match = this->get_name_to_match(symbol_name, i,
+ &cpp_demangled_name,
+ &java_demangled_name);
+ if (name_to_match == NULL)
+ {
+ // If the name can not be demangled, the GNU linker goes
+ // ahead and tries to match it anyhow. That does not
+ // make sense to me and I have not implemented it.
+ continue;
+ }
+
+ Exact::const_iterator pe = exact->find(name_to_match);
+ if (pe != exact->end())
+ {
+ const Version_tree_match& vtm(pe->second);
+ if (vtm.ambiguous != NULL)
+ gold_warning(_("using '%s' as version for '%s' which is also "
+ "named in version '%s' in script"),
+ vtm.real->tag.c_str(), name_to_match,
+ vtm.ambiguous->tag.c_str());
+
+ if (pversion != NULL)
+ *pversion = vtm.real->tag;
+ if (p_is_global != NULL)
+ *p_is_global = vtm.is_global;
+
+ // If we are using --no-undefined-version, and this is a
+ // global symbol, we have to record that we have found this
+ // symbol, so that we don't warn about it. We have to do
+ // this now, because otherwise we have no way to get from a
+ // non-C language back to the demangled name that we
+ // matched.
+ if (p_is_global != NULL && vtm.is_global)
+ vtm.expression->was_matched_by_symbol = true;
+
+ return true;
+ }
+ }
+
+ // Look through the glob patterns in reverse order.
+
+ for (Globs::const_reverse_iterator p = this->globs_.rbegin();
+ p != this->globs_.rend();
+ ++p)
+ {
+ int language = p->expression->language;
+ const char* name_to_match = this->get_name_to_match(symbol_name,
+ language,
+ &cpp_demangled_name,
+ &java_demangled_name);
+ if (name_to_match == NULL)
+ continue;
+
+ if (fnmatch(p->expression->pattern.c_str(), name_to_match,
+ FNM_NOESCAPE) == 0)
+ {
+ if (pversion != NULL)
+ *pversion = p->version->tag;
+ if (p_is_global != NULL)
+ *p_is_global = p->is_global;
+ return true;
+ }
+ }
+
+ // Finally, there may be a wildcard.
+ if (this->default_version_ != NULL)
+ {
+ if (pversion != NULL)
+ *pversion = this->default_version_->tag;
+ if (p_is_global != NULL)
+ *p_is_global = this->default_is_global_;
+ return true;
+ }
+
+ return false;
+}
+
+// Give an error if any exact symbol names (not wildcards) appear in a
+// version script, but there is no such symbol.
+
+void
+Version_script_info::check_unmatched_names(const Symbol_table* symtab) const
+{
+ for (size_t i = 0; i < this->version_trees_.size(); ++i)
+ {
+ const Version_tree* vt = this->version_trees_[i];
+ if (vt->global == NULL)
+ continue;
+ for (size_t j = 0; j < vt->global->expressions.size(); ++j)
+ {
+ const Version_expression& expression(vt->global->expressions[j]);
+
+ // Ignore cases where we used the version because we saw a
+ // symbol that we looked up. Note that
+ // WAS_MATCHED_BY_SYMBOL will be true even if the symbol was
+ // not a definition. That's OK as in that case we most
+ // likely gave an undefined symbol error anyhow.
+ if (expression.was_matched_by_symbol)
+ continue;
+
+ // Just ignore names which are in languages other than C.
+ // We have no way to look them up in the symbol table.
+ if (expression.language != LANGUAGE_C)
+ continue;
+
+ // Remove backslash quoting, and ignore wildcard patterns.
+ std::string pattern = expression.pattern;
+ if (!expression.exact_match)
+ {
+ if (this->unquote(&pattern))
+ continue;
+ }
+
+ if (symtab->lookup(pattern.c_str(), vt->tag.c_str()) == NULL)
+ gold_error(_("version script assignment of %s to symbol %s "
+ "failed: symbol not defined"),
+ vt->tag.c_str(), pattern.c_str());
+ }
}
- static const std::string empty = "";
- return empty;
}
struct Version_dependency_list*
FILE* f,
const Version_expression_list* vel) const
{
- std::string current_language;
+ Version_script_info::Language current_language = LANGUAGE_C;
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())
+ if (current_language != LANGUAGE_C)
fprintf(f, " }\n");
- fprintf(f, " extern \"%s\" {\n", ve.language.c_str());
+ switch (ve.language)
+ {
+ case LANGUAGE_C:
+ break;
+ case LANGUAGE_CXX:
+ fprintf(f, " extern \"C++\" {\n");
+ break;
+ case LANGUAGE_JAVA:
+ fprintf(f, " extern \"Java\" {\n");
+ break;
+ default:
+ gold_unreachable();
+ }
current_language = ve.language;
}
fprintf(f, " ");
- if (!current_language.empty())
+ if (current_language != LANGUAGE_C)
fprintf(f, " ");
if (ve.exact_match)
fprintf(f, "\n");
}
- if (!current_language.empty())
+ if (current_language != LANGUAGE_C)
fprintf(f, " }\n");
}
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;
}
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
}
}
- Input_file_argument file(name_string.c_str(), false, extra_search_path,
- false, closure->position_dependent_options());
+ 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 add a library to the link.
+
+extern "C" void
+script_add_library(void* closurev, const char* name, size_t length)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ std::string name_string(name, length);
+
+ if (name_string[0] != 'l')
+ gold_error(_("library name must be prefixed with -l"));
+
+ Input_file_argument file(name_string.c_str() + 1,
+ Input_file_argument::INPUT_FILE_TYPE_LIBRARY,
+ "", false,
+ closure->position_dependent_options());
closure->inputs()->add_file(file);
}
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->script_options()->add_symbol_assignment(name, length,
+ closure->parsing_defsym(),
+ value, provide, hidden);
+ closure->clear_skip_on_incompatible_target();
}
// Called by the bison parser to add an assertion.
{
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.
else
{
bool past_a_double_dash_option = false;
- char* mutable_option = strndup(option, length);
+ 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);
// 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
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
+ else if (!closure->command_line()->options().nostdlib())
{
std::string s = "-L" + std::string(option, length);
script_parse_option(closurev, s.c_str(), s.size());
script_push_lex_into_version_mode(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ if (closure->version_script()->is_finalized())
+ gold_error(_("%s:%d:%d: invalid use of VERSION in input file"),
+ closure->filename(), closure->lineno(), closure->charpos());
closure->push_lex_mode(Lex::VERSION_SCRIPT);
}
struct Version_dependency_list *deps)
{
gold_assert(tree != NULL);
- gold_assert(tag != NULL);
tree->dependencies = deps;
- tree->tag = std::string(tag, taglen);
+ if (tag != NULL)
+ tree->tag = std::string(tag, taglen);
}
// Add a dependencies to the list of existing dependencies, if any,
}
// 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,
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));
+ std::string language(lang, langlen);
+ Version_script_info::Language code;
+ if (language.empty() || language == "C")
+ code = Version_script_info::LANGUAGE_C;
+ else if (language == "C++")
+ code = Version_script_info::LANGUAGE_CXX;
+ else if (language == "Java")
+ code = Version_script_info::LANGUAGE_JAVA;
+ else
+ {
+ char* buf = new char[langlen + 100];
+ snprintf(buf, langlen + 100,
+ _("unrecognized version script language '%s'"),
+ language.c_str());
+ yyerror(closurev, buf);
+ delete[] buf;
+ code = Version_script_info::LANGUAGE_C;
+ }
+ closure->push_language(code);
}
extern "C" void
{
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.
// Finish processing entries for an output section.
extern "C" void
-script_finish_output_section(void* closurev,
+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()->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_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.
yyerror(closurev, _("unknown PHDR type (try integer)"));
return elfcpp::PT_NULL;
}
+
+extern "C" void
+script_saw_segment_start_expression(void* closurev)
+{
+ Parser_closure* closure = static_cast<Parser_closure*>(closurev);
+ Script_sections* ss = closure->script_options()->script_sections();
+ ss->set_saw_segment_start_expression(true);
+}