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Kernel: Don't allocate so much when generating coredumps

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Instead of creating a bunch of ByteBuffers and concatenating them to
generate the "notes" segment, we now simply create a KBufferBuilder
and tell each of the notes generator helpers to write into the builder.

This allows the code to flow more naturally, with some bonus additional
error propagation. :^)
This commit is contained in:
Andreas Kling 2021-09-06 18:42:15 +02:00
parent 9db8a14264
commit 69b9b2888c
2 changed files with 40 additions and 84 deletions
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18
Kernel/Coredump.h
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@ -24,16 +24,16 @@ private:
Coredump(NonnullRefPtr<Process>, NonnullRefPtr<FileDescription>);
static KResultOr<NonnullRefPtr<FileDescription>> try_create_target_file(Process const&, StringView output_path);
[[nodiscard]] KResult write_elf_header();
[[nodiscard]] KResult write_program_headers(size_t notes_size);
[[nodiscard]] KResult write_regions();
[[nodiscard]] KResult write_notes_segment(ByteBuffer&);
KResult write_elf_header();
KResult write_program_headers(size_t notes_size);
KResult write_regions();
KResult write_notes_segment(ReadonlyBytes);
KResultOr<ByteBuffer> create_notes_segment_data() const;
KResultOr<ByteBuffer> create_notes_process_data() const;
KResultOr<ByteBuffer> create_notes_threads_data() const;
KResultOr<ByteBuffer> create_notes_regions_data() const;
KResultOr<ByteBuffer> create_notes_metadata_data() const;
KResult create_notes_segment_data(auto&) const;
KResult create_notes_process_data(auto&) const;
KResult create_notes_threads_data(auto&) const;
KResult create_notes_regions_data(auto&) const;
KResult create_notes_metadata_data(auto&) const;
NonnullRefPtr<Process> m_process;
NonnullRefPtr<FileDescription> m_description;