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-rw-r--r--gold/script.h154
1 files changed, 116 insertions, 38 deletions
diff --git a/gold/script.h b/gold/script.h
index 69906cb..4d8cfab 100644
--- a/gold/script.h
+++ b/gold/script.h
@@ -30,11 +30,10 @@
#ifndef GOLD_SCRIPT_H
#define GOLD_SCRIPT_H
+#include <cstdio>
#include <vector>
-struct Version_dependency_list;
-struct Version_expression_list;
-struct Version_tree;
+#include "script-sections.h"
namespace gold
{
@@ -50,6 +49,9 @@ class Input_file;
class Target;
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.
@@ -68,6 +70,10 @@ class Expression
uint64_t
eval(const Symbol_table*, const Layout*);
+ // Print the expression to the FILE. This is for debugging.
+ virtual void
+ print(FILE*) const = 0;
+
protected:
struct Expression_eval_info;
@@ -90,7 +96,8 @@ class Expression
// script. A single Version_script_info object per target is owned by
// Script_options.
-class Version_script_info {
+class Version_script_info
+{
public:
~Version_script_info();
@@ -138,7 +145,14 @@ class Version_script_info {
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;
+
const std::string& get_symbol_version_helper(const char* symbol,
bool check_global) const;
@@ -147,6 +161,77 @@ class Version_script_info {
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*, const Target*);
+
+ // Finalize the symbol value.
+ void finalize(Symbol_table*, const Layout*);
+
+ // Print the assignment to the FILE. This is for debugging.
+ void
+ print(FILE*) const;
+
+ private:
+ // Sized version of finalize.
+ template<int size>
+ void
+ sized_finalize(Symbol_table*, const Layout*);
+
+ // 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
@@ -172,15 +257,14 @@ class Script_options
set_entry(const char* entry, size_t length)
{ this->entry_.assign(entry, length); }
- // Add a symbol to be defined. These are for symbol definitions
- // which appear outside of a SECTIONS clause.
+ // Add a symbol to be defined.
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));
- }
+ bool provide, bool hidden);
+
+ // Add an assertion.
+ void
+ add_assertion(Expression* check, const char* message, size_t messagelen);
// Define a symbol from the command line.
bool
@@ -198,43 +282,37 @@ class Script_options
// else has a pointer to this object.
Version_script_info*
version_script_info()
- { return &version_script_info_; }
+ { return &this->version_script_info_; }
- 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;
+ // A SECTIONS clause parsed from a linker script. Everything else
+ // has a pointer to this object.
+ Script_sections*
+ script_sections()
+ { return &this->script_sections_; }
- template<int size>
+ // 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