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Use a std::vector instead of a std::map to hold Input_merge_map.

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A std::map is hardly the best data structure for a small map from small
integers.
This commit is contained in:
Rafael Ávila de Espíndola 2015-06-01 22:47:20 -04:00
parent d78b645051
commit 400f89447b
3 changed files with 19 additions and 35 deletions
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7
gold/ChangeLog
View File

@ -1,3 +1,10 @@
2015-06-01 Rafael Ávila de Espíndola <rafael.espindola@gmail.com>
* merge.cc (get_input_merge_map): Update for data structure change.
(get_or_make_input_merge_map): Update for data structure change.
* merge.h (Object_merge_map): Use a std::vector<std::pair>> instead of
a std::map. Remove first_shnum_, first_map_, second_shnum_, second_map_.
2015-05-16 Alan Modra <amodra@gmail.com>
* reloc.cc (Sized_relobj_file::find_functions): Use function_location.

31
gold/merge.cc
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@ -49,13 +49,13 @@ const Object_merge_map::Input_merge_map*
Object_merge_map::get_input_merge_map(unsigned int shndx) const
{
gold_assert(shndx != -1U);
if (shndx == this->first_shnum_)
return &this->first_map_;
if (shndx == this->second_shnum_)
return &this->second_map_;
Section_merge_maps::const_iterator p = this->section_merge_maps_.find(shndx);
if (p != this->section_merge_maps_.end())
return p->second;
const Section_merge_maps &maps = this->section_merge_maps_;
for (Section_merge_maps::const_iterator i = maps.begin(), e = maps.end();
i != e; ++i)
{
if (i->first == shndx)
return i->second;
}
return NULL;
}
@ -73,23 +73,10 @@ Object_merge_map::get_or_make_input_merge_map(
return map;
}
// We need to create a new entry.
if (this->first_shnum_ == -1U)
{
this->first_shnum_ = shndx;
this->first_map_.output_data = output_data;
return &this->first_map_;
}
if (this->second_shnum_ == -1U)
{
this->second_shnum_ = shndx;
this->second_map_.output_data = output_data;
return &this->second_map_;
}
Input_merge_map* new_map = new Input_merge_map;
new_map->output_data = output_data;
this->section_merge_maps_[shndx] = new_map;
Section_merge_maps &maps = this->section_merge_maps_;
maps.push_back(std::make_pair(shndx, new_map));
return new_map;
}

16
gold/merge.h
View File

@ -42,9 +42,7 @@ class Object_merge_map
{
public:
Object_merge_map()
: first_shnum_(-1U), first_map_(),
second_shnum_(-1U), second_map_(),
section_merge_maps_()
: section_merge_maps_()
{ }
~Object_merge_map();
@ -152,7 +150,8 @@ class Object_merge_map
};
// Map input section indices to merge maps.
typedef std::map<unsigned int, Input_merge_map*> Section_merge_maps;
typedef std::vector<std::pair<unsigned int, Input_merge_map*> >
Section_merge_maps;
// Return a pointer to the Input_merge_map to use for the input
// section SHNDX, or NULL.
@ -165,15 +164,6 @@ class Object_merge_map
this)->get_input_merge_map(shndx));
}
// Any given object file will normally only have a couple of input
// sections with mergeable contents. So we keep the first two input
// section numbers inline, and push any further ones into a map. A
// value of -1U in first_shnum_ or second_shnum_ means that we don't
// have a corresponding entry.
unsigned int first_shnum_;
Input_merge_map first_map_;
unsigned int second_shnum_;
Input_merge_map second_map_;
Section_merge_maps section_merge_maps_;
};