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LibELF: Don't build barely-used section lookup table in ELF::Image

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The name-to-section lookup table was only used in a handful of places,
and none of them were calling it nearly enough to justify building
a cache for it in the first place. So let's get rid of it and reduce
startup time by a little bit. :^)
This commit is contained in:
Andreas Kling 2021-02-23 19:45:29 +01:00
parent 06919d189b
commit 4ed85e9b9e
Notes: sideshowbarker 2024-07-18 21:58:51 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/4ed85e9b9e1
2 changed files with 6 additions and 12 deletions
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13
Userland/Libraries/LibELF/Image.cpp
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@ -186,12 +186,6 @@ bool Image::parse()
}
}
// Then create a name-to-index map.
for (unsigned i = 0; i < section_count(); ++i) {
auto section = this->section(i);
m_sections.set(section.name(), move(i));
}
return m_valid;
}
@ -298,8 +292,11 @@ Image::RelocationSection Image::Section::relocations() const
Image::Section Image::lookup_section(const String& name) const
{
ASSERT(m_valid);
if (auto it = m_sections.find(name); it != m_sections.end())
return section((*it).value);
for (unsigned i = 0; i < section_count(); ++i) {
auto section = this->section(i);
if (section.name() == name)
return section;
}
return section(0);
}

5
Userland/Libraries/LibELF/Image.h
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@ -26,10 +26,8 @@
#pragma once
#include <AK/ByteBuffer.h>
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <Kernel/VirtualAddress.h>
#include <LibELF/exec_elf.h>
@ -230,7 +228,6 @@ private:
const u8* m_buffer { nullptr };
size_t m_size { 0 };
bool m_verbose_logging { true };
HashMap<String, unsigned> m_sections;
bool m_valid { false };
unsigned m_symbol_table_section_index { 0 };
unsigned m_string_table_section_index { 0 };