#ifndef GOLD_SCRIPT_H
#define GOLD_SCRIPT_H
+#include <cstdio>
+#include <string>
#include <vector>
+#include "script-sections.h"
+
namespace gold
{
class Command_line;
class Symbol_table;
class Layout;
+class Mapfile;
class Input_argument;
class Input_objects;
class Input_group;
class Input_file;
-class Target;
+class Output_segment;
class Task_token;
class Workqueue;
+struct Version_dependency_list;
+struct Version_expression_list;
+struct Version_tree;
// This class represents an expression in a linker script.
virtual ~Expression()
{ }
- // Return the value of the expression.
+ // Return the value of the expression which is not permitted to
+ // refer to the dot symbol. CHECK_ASSERTIONS is true if we should
+ // check whether assertions are true.
+ uint64_t
+ eval(const Symbol_table*, const Layout*, bool check_assertions);
+
+ // Return the value of an expression which is permitted to refer to
+ // the dot symbol. DOT_VALUE is the absolute value of the dot
+ // symbol. DOT_SECTION is the section in which dot is defined; it
+ // should be NULL if the dot symbol has an absolute value (e.g., is
+ // defined in a SECTIONS clause outside of any output section
+ // definition). This sets *RESULT_SECTION to indicate where the
+ // value is defined. If the value is absolute *RESULT_SECTION will
+ // be NULL. Note that the returned value is still an absolute
+ // value; to get a section relative value the caller must subtract
+ // the section address.
+ uint64_t
+ eval_with_dot(const Symbol_table*, const Layout*, bool check_assertions,
+ uint64_t dot_value, Output_section* dot_section,
+ Output_section** result_section);
+
+ // Return the value of an expression which may or may not be
+ // permitted to refer to the dot symbol, depending on
+ // is_dot_available.
uint64_t
- eval(const Symbol_table*, const Layout*);
+ eval_maybe_dot(const Symbol_table*, const Layout*, bool check_assertions,
+ bool is_dot_available, uint64_t dot_value,
+ Output_section* dot_section,
+ Output_section** result_section);
+
+ // Print the expression to the FILE. This is for debugging.
+ virtual void
+ print(FILE*) const = 0;
protected:
struct Expression_eval_info;
Expression& operator=(const Expression&);
};
+
+// Version_script_info stores information parsed from the version
+// script, either provided by --version-script or as part of a linker
+// script. A single Version_script_info object per target is owned by
+// Script_options.
+
+class Version_script_info
+{
+ public:
+ ~Version_script_info();
+
+ // Clear everything.
+ void
+ clear();
+
+ // Return whether any version were defined in the version script.
+ bool
+ empty() const
+ { return this->version_trees_.empty(); }
+
+ // If there is a version associated with SYMBOL, return true, and
+ // set *VERSION to the version. Otherwise, return false.
+ bool
+ get_symbol_version(const char* symbol, std::string* version) const
+ { return this->get_symbol_version_helper(symbol, true, version); }
+
+ // Return whether this symbol matches the local: section of some
+ // version.
+ bool
+ symbol_is_local(const char* symbol) const
+ { return this->get_symbol_version_helper(symbol, false, NULL); }
+
+ // Return the names of versions defined in the version script.
+ // Strings are allocated out of the stringpool given in the
+ // constructor.
+ std::vector<std::string>
+ get_versions() const;
+
+ // Return the list of dependencies for this version.
+ std::vector<std::string>
+ get_dependencies(const char* version) const;
+
+ // The following functions should only be used by the bison helper
+ // functions. They allocate new structs whose memory belongs to
+ // Version_script_info. The bison functions copy the information
+ // from the version script into these structs.
+ struct Version_dependency_list*
+ allocate_dependency_list();
+
+ struct Version_expression_list*
+ allocate_expression_list();
+
+ struct Version_tree*
+ allocate_version_tree();
+
+ // Print contents to the FILE. This is for debugging.
+ void
+ print(FILE*) const;
+
+ private:
+ void
+ print_expression_list(FILE* f, const Version_expression_list*) const;
+
+ bool get_symbol_version_helper(const char* symbol,
+ bool check_global,
+ std::string* pversion) const;
+
+ std::vector<struct Version_dependency_list*> dependency_lists_;
+ std::vector<struct Version_expression_list*> expression_lists_;
+ std::vector<struct Version_tree*> version_trees_;
+};
+
+// This class manages assignments to symbols. These can appear in
+// three different locations in scripts: outside of a SECTIONS clause,
+// within a SECTIONS clause, and within an output section definition
+// within a SECTIONS clause. This can also appear on the command line
+// via the --defsym command line option.
+
+class Symbol_assignment
+{
+ public:
+ Symbol_assignment(const char* name, size_t namelen, Expression* val,
+ bool provide, bool hidden)
+ : name_(name, namelen), val_(val), provide_(provide), hidden_(hidden),
+ sym_(NULL)
+ { }
+
+ // Add the symbol to the symbol table.
+ void
+ add_to_table(Symbol_table*);
+
+ // Finalize the symbol value.
+ void
+ finalize(Symbol_table*, const Layout*);
+
+ // Finalize the symbol value when it can refer to the dot symbol.
+ void
+ finalize_with_dot(Symbol_table*, const Layout*, uint64_t dot_value,
+ Output_section* dot_section);
+
+ // Set the symbol value, but only if the value is absolute. This is
+ // used while processing a SECTIONS clause. We assume that dot is
+ // an absolute value here. We do not check assertions.
+ void
+ set_if_absolute(Symbol_table*, const Layout*, bool is_dot_available,
+ uint64_t dot_value);
+
+ // Print the assignment to the FILE. This is for debugging.
+ void
+ print(FILE*) const;
+
+ private:
+ // Shared by finalize and finalize_with_dot.
+ void
+ finalize_maybe_dot(Symbol_table*, const Layout*, bool is_dot_available,
+ uint64_t dot_value, Output_section* dot_section);
+
+ // Sized version of finalize.
+ template<int size>
+ void
+ sized_finalize(Symbol_table*, const Layout*, bool is_dot_available,
+ uint64_t dot_value, Output_section*);
+
+ // Symbol name.
+ std::string name_;
+ // Expression to assign to symbol.
+ Expression* val_;
+ // Whether the assignment should be provided (only set if there is
+ // an undefined reference to the symbol.
+ bool provide_;
+ // Whether the assignment should be hidden.
+ bool hidden_;
+ // The entry in the symbol table.
+ Symbol* sym_;
+};
+
+// This class manages assertions in linker scripts. These can appear
+// in all the places where a Symbol_assignment can appear.
+
+class Script_assertion
+{
+ public:
+ Script_assertion(Expression* check, const char* message,
+ size_t messagelen)
+ : check_(check), message_(message, messagelen)
+ { }
+
+ // Check the assertion.
+ void
+ check(const Symbol_table*, const Layout*);
+
+ // Print the assertion to the FILE. This is for debugging.
+ void
+ print(FILE*) const;
+
+ private:
+ // The expression to check.
+ Expression* check_;
+ // The message to issue if the expression fails.
+ std::string message_;
+};
+
// We can read a linker script in two different contexts: when
// initially parsing the command line, and when we find an input file
// which is actually a linker script. Also some of the data which can
public:
Script_options();
- // The entry address.
- const char*
- entry() const
- { return this->entry_.empty() ? NULL : this->entry_.c_str(); }
-
- // Set the entry address.
+ // Add a symbol to be defined.
void
- set_entry(const char* entry, size_t length)
- { this->entry_.assign(entry, length); }
+ add_symbol_assignment(const char* name, size_t length, Expression* value,
+ bool provide, bool hidden);
- // Add a symbol to be defined. These are for symbol definitions
- // which appear outside of a SECTIONS clause.
+ // Add an assertion.
void
- add_symbol_assignment(const char* name, size_t length, Expression* value,
- bool provided, bool hidden)
- {
- this->symbol_assignments_.push_back(Symbol_assignment(name, length, value,
- provided, hidden));
- }
+ add_assertion(Expression* check, const char* message, size_t messagelen);
// Define a symbol from the command line.
bool
define_symbol(const char* definition);
+ // Create sections required by any linker scripts.
+ void
+ create_script_sections(Layout*);
+
// Add all symbol definitions to the symbol table.
void
- add_symbols_to_table(Symbol_table*, const Target*);
+ add_symbols_to_table(Symbol_table*);
- // Finalize the symbol values.
+ // Finalize the symbol values. Also check assertions.
void
finalize_symbols(Symbol_table*, const Layout*);
- private:
- // We keep a list of symbol assignments.
- struct Symbol_assignment
- {
- // Symbol name.
- std::string name;
- // Expression to assign to symbol.
- Expression* value;
- // Whether the assignment should be provided (only set if there is
- // an undefined reference to the symbol.
- bool provide;
- // Whether the assignment should be hidden.
- bool hidden;
- // The entry in the symbol table.
- Symbol* sym;
-
- Symbol_assignment(const char* namea, size_t lengtha, Expression* valuea,
- bool providea, bool hiddena)
- : name(namea, lengtha), value(valuea), provide(providea),
- hidden(hiddena), sym(NULL)
- { }
- };
-
- typedef std::vector<Symbol_assignment> Symbol_assignments;
+ // Version information parsed from a version script. Everything
+ // else has a pointer to this object.
+ Version_script_info*
+ version_script_info()
+ { return &this->version_script_info_; }
- template<int size>
+ const Version_script_info*
+ version_script_info() const
+ { return &this->version_script_info_; }
+
+ // A SECTIONS clause parsed from a linker script. Everything else
+ // has a pointer to this object.
+ Script_sections*
+ script_sections()
+ { return &this->script_sections_; }
+
+ const Script_sections*
+ script_sections() const
+ { return &this->script_sections_; }
+
+ // Whether we saw a SECTIONS clause.
+ bool
+ saw_sections_clause() const
+ { return this->script_sections_.saw_sections_clause(); }
+
+ // Whether we saw a PHDRS clause.
+ bool
+ saw_phdrs_clause() const
+ { return this->script_sections_.saw_phdrs_clause(); }
+
+ // Set section addresses using a SECTIONS clause. Return the
+ // segment which should hold the file header and segment headers;
+ // this may return NULL, in which case the headers are not in a
+ // loadable segment.
+ Output_segment*
+ set_section_addresses(Symbol_table*, Layout*);
+
+ // Print the script to the FILE. This is for debugging.
void
- sized_finalize_symbols(Symbol_table*, const Layout*);
+ print(FILE*) const;
+
+ private:
+ // We keep a list of symbol assignments which occur outside of a
+ // SECTIONS clause.
+ typedef std::vector<Symbol_assignment*> Symbol_assignments;
+
+ // We keep a list of all assertions whcih occur outside of a
+ // SECTIONS clause.
+ typedef std::vector<Script_assertion*> Assertions;
// The entry address. This will be empty if not set.
std::string entry_;
// Symbols to set.
Symbol_assignments symbol_assignments_;
+ // Assertions to check.
+ Assertions assertions_;
+ // Version information parsed from a version script.
+ Version_script_info version_script_info_;
+ // Information from any SECTIONS clauses.
+ Script_sections script_sections_;
};
// FILE was found as an argument on the command line, but was not
-// recognized as an ELF file. Try to read it as a script. We've
-// already read BYTES of data into P. Return true if the file was
-// handled. This has to handle /usr/lib/libc.so on a GNU/Linux
-// system.
+// recognized as an ELF file. Try to read it as a script. Return
+// true if the file was handled. This has to handle /usr/lib/libc.so
+// on a GNU/Linux system. *USED_NEXT_BLOCKER is set to indicate
+// whether the function took over NEXT_BLOCKER.
bool
read_input_script(Workqueue*, const General_options&, Symbol_table*, Layout*,
- Dirsearch*, Input_objects*, Input_group*,
- const Input_argument*, Input_file*, const unsigned char* p,
- off_t bytes, Task_token* this_blocker,
- Task_token* next_blocker);
+ Dirsearch*, Input_objects*, Mapfile*, Input_group*,
+ const Input_argument*, Input_file*,
+ Task_token* next_blocker, bool* used_next_blocker);
// FILE 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*);
+read_commandline_script(const char* filename, Command_line* cmdline);
+
+// FILE 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);
+
+// FILENAME was found as an argument to --dynamic-list. Read it as a
+// version script (actually, a versym_node from a version script), and
+// store its contents in DYNAMIC_LIST.
+
+bool
+read_dynamic_list(const char* filename, Command_line* cmdline,
+ Script_options* dynamic_list);
} // End namespace gold.