gecko-dev

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History

Sylvestre Ledru 45030f6970 Bug 1519636 - Reformat recent changes to the Google coding style r=emilio,necko-reviewers,geckoview-reviewers,application-update-reviewers,media-playback-reviewers,devtools-reviewers,anti-tracking-reviewers,profiler-reviewers,win-reviewers,migration-reviewers,padenot,mconley,nchevobbe,kershaw,gstoll,mstange,bytesized,m_kato This new version of clang 17 also slightly changed the formatting. # ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D215914		2024-07-17 11:15:31 +00:00
..
inject	Bug 1867459 - Replace CPU_ARCH with TARGET_CPU. r=firefox-build-system-reviewers,sergesanspaille	2023-12-08 10:43:59 +00:00
dummy.c
elf.cpp	Bug 1519636 - Reformat recent changes to the Google coding style r=emilio,necko-reviewers,geckoview-reviewers,application-update-reviewers,media-playback-reviewers,devtools-reviewers,anti-tracking-reviewers,profiler-reviewers,win-reviewers,migration-reviewers,padenot,mconley,nchevobbe,kershaw,gstoll,mstange,bytesized,m_kato	2024-07-17 11:15:31 +00:00
elfhack.cpp	Bug 1903021 - Avoid use after vector resize. r=sergesanspaille	2024-06-20 20:15:15 +00:00
elfxx.h	Bug 1519636 - Reformat recent changes to the Google coding style r=emilio,necko-reviewers,geckoview-reviewers,application-update-reviewers,media-playback-reviewers,devtools-reviewers,anti-tracking-reviewers,profiler-reviewers,win-reviewers,migration-reviewers,padenot,mconley,nchevobbe,kershaw,gstoll,mstange,bytesized,m_kato	2024-07-17 11:15:31 +00:00
inject.c	Bug 1898109 - Allow the Android system linker to handle RELR relocations itself. r=sergesanspaille	2024-05-22 20:22:59 +00:00
Makefile.in	Bug 1854497 - In elfhack checks, don't look for parens. r=firefox-build-system-reviewers,ahochheiden	2023-09-22 02:28:00 +00:00
moz.build	Bug 1856752 - Allow more leniency wrt swapping .relr.dyn and .rel.plt sections. r=sergesanspaille	2023-10-05 08:40:44 +00:00
README
relrhack.cpp	Bug 1903254 - Explicitly include <array> in relrhack.cpp r=glandium	2024-06-19 09:31:33 +00:00
relrhack.h	Bug 1839740 - New relrhack tool, a modern replacement to elfhack. r=firefox-build-system-reviewers,sergesanspaille	2023-09-16 19:52:25 +00:00
test-array.c
test-ctors.c
test.c

README

Elfhack is a program to optimize ELF binaries for size and cold startup
speed.

Presently, it is quite experimental, though it works well for the target
it was created for: Firefox's libxul.so.

Elfhack currently only does one thing: packing dynamic relocations ;
which ends up being a quite complex task, that can be summarized this
way:
- Remove RELATIVE relocations from the .rel.dyn/.rela.dyn section.
- Inject a small code able to apply relative relocations "by hand"
  after the .rel.dyn/.rela.dyn section.
- Inject a section containing relocative relocations in a different
  and more packed format, after the small code.
- Register the small code as DT_INIT function. Make the small code call
  what was initially the DT_INIT function, if there was one.
- Remove the hole between the new section containing relative
  relocations and the following sections, adjusting offsets and base
  addresses accordingly.
- Adjust PT_LOAD entries to fit new offsets, and add an additional
  PT_LOAD entry when that is necessary to handle the discrepancy between
  offsets and base addresses, meaning the section offsets may yet again
  need adjustments.
- Adjust various DT_* dynamic tags to fit the new ELF layout.
- Adjust section headers.
- Adjust ELF headers.

See http://glandium.org/blog/?p=1177#relocations for some figures.