binutils-gdb/gold/attributes.h

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// attributes.h -- object attributes for gold -*- C++ -*-
// Copyright (C) 2009-2018 Free Software Foundation, Inc.
// Written by Doug Kwan <dougkwan@google.com>.
// This file contains code adapted from BFD.
// 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.
// Handle object attributes.
#ifndef GOLD_ATTRIBUTES_H
#define GOLD_ATTRIBUTES_H
#include <map>
#include "parameters.h"
#include "target.h"
#include "output.h"
#include "reduced_debug_output.h"
namespace gold
{
// Object attribute values. The attribute tag is not stored in this object.
class Object_attribute
{
public:
// The value of an object attribute. The type indicates whether the
// attribute holds and integer, a string, or both. It can also indicate that
// there can be no default (i.e. all values must be written to file, even
// zero).
enum
{
ATTR_TYPE_FLAG_INT_VAL = (1 << 0),
ATTR_TYPE_FLAG_STR_VAL = (1 << 1),
ATTR_TYPE_FLAG_NO_DEFAULT = (1 << 2)
};
// Object attributes may either be defined by the processor ABI, index
// OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
// (and possibly also processor-specific), index OBJ_ATTR_GNU.
enum
{
OBJ_ATTR_PROC,
OBJ_ATTR_GNU,
OBJ_ATTR_FIRST = OBJ_ATTR_PROC,
OBJ_ATTR_LAST = OBJ_ATTR_GNU
};
// The following object attribute tags are taken as generic, for all
// targets and for "gnu" where there is no target standard.
enum
{
Tag_NULL = 0,
Tag_File = 1,
Tag_Section = 2,
Tag_Symbol = 3,
Tag_compatibility = 32
};
Object_attribute()
: type_(0), int_value_(0), string_value_()
{ }
// Copying constructor. We need to implement this to copy the string value.
Object_attribute(const Object_attribute& oa)
: type_(oa.type_), int_value_(oa.int_value_), string_value_(oa.string_value_)
{ }
~Object_attribute()
{ }
// Assignment operator. We need to implement this to copy the string value.
Object_attribute&
operator=(const Object_attribute& source)
{
this->type_ = source.type_;
this->int_value_ = source.int_value_;
this->string_value_ = source.string_value_;
return *this;
}
// Return attribute type.
int
type() const
{ return this->type_; }
// Set attribute type.
void
set_type(int type)
{ this->type_ = type; }
// Return integer value.
unsigned int
int_value() const
{ return this->int_value_; }
// Set integer value.
void
set_int_value(unsigned int i)
{ this->int_value_ = i; }
// Return string value.
const std::string&
string_value() const
{ return this->string_value_; }
// Set string value.
void
set_string_value(const std::string& s)
{ this->string_value_ = s; }
void
set_string_value(const char* s)
{ this->string_value_ = s; }
// Whether attribute type has integer value.
static bool
attribute_type_has_int_value(int type)
{ return (type & ATTR_TYPE_FLAG_INT_VAL) != 0; }
// Whether attribute type has string value.
static bool
attribute_type_has_string_value(int type)
{ return (type & ATTR_TYPE_FLAG_STR_VAL) != 0; }
// Whether attribute type has no default value.
static bool
attribute_type_has_no_default(int type)
{ return (type & ATTR_TYPE_FLAG_NO_DEFAULT) != 0; }
// Whether this has default value (0/"").
bool
is_default_attribute() const;
// Return ULEB128 encoded size of tag and attribute.
size_t
size(int tag) const;
// Whether this matches another object attribute in merging.
bool
matches(const Object_attribute& oa) const;
// Write to attribute with tag to BUFFER.
void
write(int tag, std::vector<unsigned char>* buffer) const;
// Determine what arguments an attribute tag takes.
static int
arg_type(int vendor, int tag)
{
switch (vendor)
{
case OBJ_ATTR_PROC:
return parameters->target().attribute_arg_type(tag);
case OBJ_ATTR_GNU:
return Object_attribute::gnu_arg_type(tag);
default:
gold_unreachable();
}
}
private:
// Determine whether a GNU object attribute tag takes an integer, a
// string or both. */
static int
gnu_arg_type(int tag)
{
// Except for Tag_compatibility, for GNU attributes we follow the
// same rule ARM ones > 32 follow: odd-numbered tags take strings
// and even-numbered tags take integers. In addition, tag & 2 is
// nonzero for architecture-independent tags and zero for
// architecture-dependent ones.
if (tag == Object_attribute::Tag_compatibility)
return ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_STR_VAL;
else
return (tag & 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL : ATTR_TYPE_FLAG_INT_VAL;
}
// Attribute type.
int type_;
// Integer value.
int int_value_;
// String value.
std::string string_value_;
};
// This class contains attributes of a particular vendor.
class Vendor_object_attributes
{
public:
// The maximum number of known object attributes for any target.
static const int NUM_KNOWN_ATTRIBUTES = 71;
Vendor_object_attributes(int vendor)
: vendor_(vendor), other_attributes_()
{ }
// Copying constructor.
Vendor_object_attributes(const Vendor_object_attributes&);
~Vendor_object_attributes()
{
for (Other_attributes::iterator p = this->other_attributes_.begin();
p != this->other_attributes_.end();
++p)
delete p->second;
}
// Size of this in number of bytes.
size_t
size() const;
// Name of this written vendor subsection.
const char*
name() const
{
return (this->vendor_ == Object_attribute::OBJ_ATTR_PROC
? parameters->target().attributes_vendor()
: "gnu");
}
// Return an array of known attributes.
Object_attribute*
known_attributes()
{ return &this->known_attributes_[0]; }
const Object_attribute*
known_attributes() const
{ return &this->known_attributes_[0]; }
typedef std::map<int, Object_attribute*> Other_attributes;
// Return attributes other than the known ones.
Other_attributes*
other_attributes()
{ return &this->other_attributes_; }
const Other_attributes*
other_attributes() const
{ return &this->other_attributes_; }
// Return a new attribute associated with TAG.
Object_attribute*
new_attribute(int tag);
// Get an attribute
Object_attribute*
get_attribute(int tag);
const Object_attribute*
get_attribute(int tag) const;
// Write to BUFFER.
void
write(std::vector<unsigned char>* buffer) const;
private:
// Vendor of the object attributes.
int vendor_;
// Attributes with known tags. There are store in an array for fast
// access.
Object_attribute known_attributes_[NUM_KNOWN_ATTRIBUTES];
// Attributes with known tags. There are stored in a sorted container.
Other_attributes other_attributes_;
};
// This class contains contents of an attributes section.
class Attributes_section_data
{
public:
// Construct an Attributes_section_data object by parsing section contents
// in VIEW of SIZE.
Attributes_section_data(const unsigned char* view, section_size_type size);
// Copying constructor.
Attributes_section_data(const Attributes_section_data& asd)
{
for (int vendor = Object_attribute::OBJ_ATTR_FIRST;
vendor <= Object_attribute::OBJ_ATTR_LAST;
++vendor)
this->vendor_object_attributes_[vendor] =
new Vendor_object_attributes(*asd.vendor_object_attributes_[vendor]);
}
~Attributes_section_data()
{
for (int vendor = Object_attribute::OBJ_ATTR_FIRST;
vendor <= Object_attribute::OBJ_ATTR_LAST;
++vendor)
delete this->vendor_object_attributes_[vendor];
}
// Return the size of this as number of bytes.
size_t
size() const;
// Return an array of known attributes.
Object_attribute*
known_attributes(int vendor)
{
gold_assert(vendor >= OBJ_ATTR_FIRST && vendor <= OBJ_ATTR_LAST);
return this->vendor_object_attributes_[vendor]->known_attributes();
}
const Object_attribute*
known_attributes(int vendor) const
{
gold_assert(vendor >= OBJ_ATTR_FIRST && vendor <= OBJ_ATTR_LAST);
return this->vendor_object_attributes_[vendor]->known_attributes();
}
// Return the other attributes.
Vendor_object_attributes::Other_attributes*
other_attributes(int vendor)
{
gold_assert(vendor >= OBJ_ATTR_FIRST && vendor <= OBJ_ATTR_LAST);
return this->vendor_object_attributes_[vendor]->other_attributes();
}
// Return the other attributes.
const Vendor_object_attributes::Other_attributes*
other_attributes(int vendor) const
{
gold_assert(vendor >= OBJ_ATTR_FIRST && vendor <= OBJ_ATTR_LAST);
return this->vendor_object_attributes_[vendor]->other_attributes();
}
// Return an attribute.
Object_attribute*
get_attribute(int vendor, int tag)
{
gold_assert(vendor >= OBJ_ATTR_FIRST && vendor <= OBJ_ATTR_LAST);
return this->vendor_object_attributes_[vendor]->get_attribute(tag);
}
const Object_attribute*
get_attribute(int vendor, int tag) const
{
gold_assert(vendor >= OBJ_ATTR_FIRST && vendor <= OBJ_ATTR_LAST);
return this->vendor_object_attributes_[vendor]->get_attribute(tag);
}
// Merge target-independent attributes from another Attributes_section_data
// of an object called NAME.
void
merge(const char* name, const Attributes_section_data* pasd);
// Write to byte stream in an unsigned char vector.
void
write(std::vector<unsigned char>*) const;
private:
// For convenience.
static const int OBJ_ATTR_FIRST = Object_attribute::OBJ_ATTR_FIRST;
static const int OBJ_ATTR_LAST = Object_attribute::OBJ_ATTR_LAST;
// Vendor object attributes.
Vendor_object_attributes* vendor_object_attributes_[OBJ_ATTR_LAST+1];
};
// This class is used for writing out an Attribute_section_data.
class Output_attributes_section_data : public Output_section_data
{
public:
Output_attributes_section_data(const Attributes_section_data& asd)
: Output_section_data(1), attributes_section_data_(asd)
{ }
protected:
// Write to a map file.
void
do_print_to_mapfile(Mapfile* mapfile) const
{ mapfile->print_output_data(this, _("** attributes")); }
// Write the data to the output file.
void
do_write(Output_file*);
// Set final data size.
void
set_final_data_size()
{ this->set_data_size(attributes_section_data_.size()); }
private:
// Attributes_section_data corresponding to this.
const Attributes_section_data& attributes_section_data_;
};
} // End namespace gold.
#endif // !defined(GOLD_ATTRIBUTES_H)