// merge.h -- handle section merging for gold -*- C++ -*-
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// For each object with merge sections, we store an Object_merge_map.
// This is used to map locations in input sections to a merged output
// section. The output section itself is not recorded here--it can be
-// found in the map_to_output_ field of the Object.
+// found in the output_sections_ field of the Object.
class Object_merge_map
{
{
public:
Output_merge_base(uint64_t entsize, uint64_t addralign)
- : Output_section_data(addralign), merge_map_(), entsize_(entsize)
+ : Output_section_data(addralign), merge_map_(), entsize_(entsize),
+ keeps_input_sections_(false), first_relobj_(NULL), first_shndx_(-1),
+ input_sections_()
{ }
+ // Return the entry size.
+ uint64_t
+ entsize() const
+ { return this->entsize_; }
+
+ // Whether this is a merge string section. This is only true of
+ // Output_merge_string.
+ bool
+ is_string()
+ { return this->do_is_string(); }
+
+ // Whether this keeps input sections.
+ bool
+ keeps_input_sections() const
+ { return this->keeps_input_sections_; }
+
+ // Set the keeps-input-sections flag. This is virtual so that sub-classes
+ // can perform additional checks.
+ void
+ set_keeps_input_sections()
+ { this->do_set_keeps_input_sections(); }
+
+ // Return the object of the first merged input section. This used
+ // for script processing. This is NULL if merge section is empty.
+ Relobj*
+ first_relobj() const
+ { return this->first_relobj_; }
+
+ // Return the section index of the first merged input section. This
+ // is used for script processing. This is valid only if merge section
+ // is not valid.
+ unsigned int
+ first_shndx() const
+ {
+ gold_assert(this->first_relobj_ != NULL);
+ return this->first_shndx_;
+ }
+
+ // Set of merged input sections.
+ typedef Unordered_set<Section_id, Section_id_hash> Input_sections;
+
+ // Beginning of merged input sections.
+ Input_sections::const_iterator
+ input_sections_begin() const
+ {
+ gold_assert(this->keeps_input_sections_);
+ return this->input_sections_.begin();
+ }
+
+ // Beginning of merged input sections.
+ Input_sections::const_iterator
+ input_sections_end() const
+ {
+ gold_assert(this->keeps_input_sections_);
+ return this->input_sections_.end();
+ }
+
protected:
// Return the output offset for an input offset.
bool
bool
do_is_merge_section_for(const Relobj*, unsigned int shndx) const;
- // Return the entry size.
- uint64_t
- entsize() const
- { return this->entsize_; }
-
// Add a mapping from an OFFSET in input section SHNDX in object
// OBJECT to an OUTPUT_OFFSET in the output section. OUTPUT_OFFSET
// is the offset from the start of the merged data in the output
this->merge_map_.add_mapping(object, shndx, offset, length, output_offset);
}
+ // This may be overriden by the child class.
+ virtual bool
+ do_is_string()
+ { return false; }
+
+ // This may be overridden by the child class.
+ virtual void
+ do_set_keeps_input_sections()
+ { this->keeps_input_sections_ = true; }
+
+ // Record the merged input section for script processing.
+ void
+ record_input_section(Relobj* relobj, unsigned int shndx);
+
private:
// A mapping from input object/section/offset to offset in output
// section.
// The entry size. For fixed-size constants, this is the size of
// the constants. For strings, this is the size of a character.
uint64_t entsize_;
+ // Whether we keep input sections.
+ bool keeps_input_sections_;
+ // Object of the first merged input section. We use this for script
+ // processing.
+ Relobj* first_relobj_;
+ // Section index of the first merged input section.
+ unsigned int first_shndx_;
+ // Input sections. We only keep them is keeps_input_sections_ is true.
+ Input_sections input_sections_;
};
// Handle SHF_MERGE sections with fixed-size constant data.
void
do_write_to_buffer(unsigned char*);
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** merge constants")); }
+
// Print merge stats to stderr.
void
do_print_merge_stats(const char* section_name);
+ // Set keeps-input-sections flag.
+ void
+ do_set_keeps_input_sections()
+ {
+ gold_assert(this->input_count_ == 0);
+ Output_merge_base::do_set_keeps_input_sections();
+ }
+
private:
// We build a hash table of the fixed-size constants. Each constant
// is stored as a pointer into the section data we are accumulating.
void
do_write_to_buffer(unsigned char*);
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** merge strings")); }
+
// Print merge stats to stderr.
void
do_print_merge_stats(const char* section_name);
clear_stringpool()
{ this->stringpool_.clear(); }
+ // Whether this is a merge string section.
+ virtual bool
+ do_is_string()
+ { return true; }
+
+ // Set keeps-input-sections flag.
+ void
+ do_set_keeps_input_sections()
+ {
+ gold_assert(this->input_count_ == 0);
+ Output_merge_base::do_set_keeps_input_sections();
+ }
+
private:
// The name of the string type, for stats.
const char*
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