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There are, sadly, many combinations of linkage in use throughout the tree. The main differentiator, though, is between program/libraries related to Gecko or not. Kind of. Some need mozglue, some don't. Some need dependent linkage, some standalone. Anyways, these new templates remove the need to manually define the right dependencies against xpcomglue, nspr, mozalloc and mozglue in most cases. Places that build programs and were resetting MOZ_GLUE_PROGRAM_LDFLAGS or that build libraries and were resetting MOZ_GLUE_LDFLAGS can now just not use those Gecko-specific templates. |
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| .. | ||
| inject | ||
| dummy.c | ||
| elf.cpp | ||
| elfhack.cpp | ||
| elfxx.h | ||
| inject.c | ||
| Makefile.in | ||
| moz.build | ||
| README | ||
| test-array.c | ||
| test-ctors.c | ||
| test.c | ||
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.