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7 Commits

Author SHA1 Message Date
Fangrui Song b159906a9a [test] Change llvm-readobj -long-option to --long-option or well-known short options. NFC 
Also change some options that have different semantics (cause confusion) in llvm-readelf mode:

-s => -S
-t => --symbols
-sd => --section-data

llvm-svn: 359651
 2019-05-01 05:49:01 +00:00
Fangrui Song b6772b86e2 [ELF] Move `// REQUIRES:` line to the top 
llvm-svn: 335676
 2018-06-26 22:20:04 +00:00
Rafael Espindola 7b4dd875df Don't check symbol value in this test. 
llvm-svn: 288704
 2016-12-05 21:02:45 +00:00
George Rimar aa4dc20f09 [ELF] - Create _DYNAMIC symbol for dynamic output 
lld needs to provide _DYNAMIC symbol when creating a shared library
both bfd and gold do that.

This should fix the https://llvm.org/bugs/show_bug.cgi?id=26732

Differential revision: http://reviews.llvm.org/D17607

llvm-svn: 262348
 2016-03-01 16:23:13 +00:00
Rui Ueyama 76c0063eeb ELF: Improve performance of string table construction. 
String tables in unstripped executable files are fairly large in size.
For example, lld's executable file is about 34.4 MB in my environment,
and of which 3.5 MB is the string table. Efficiency of string table
construction matters.

Previously, the string table was built in an inefficient way. We used
StringTableBuilder to build that and enabled string tail merging,
although tail merging is not effective for the symbol table (you can
only make the string table 0.3% smaller for lld.) Tail merging is
computation intensive task and slow.

This patch eliminates string tail merging.

I changed the way of adding strings to the string table in this patch
too. Previously, strings were added using add() and the same strings
were then passed to getOffset() to get their offsets in the string table.
In this way, getOffset() needs to look up a hash table to get offsets
for given strings. This is a violation of "we look up the symbol table
(or a hash table) only once for each symbol" dogma of the new LLD's
design. Hash table lookup for long C++ mangled names is slow.
I eliminated that lookup in this patch.

In total, this patch improves link time of lld itself about 12%
(3.50 seconds -> 3.08 seconds.)

llvm-svn: 257017
 2016-01-07 02:35:32 +00:00
Rafael Espindola 9c8904fb38 Rename ld.lld2 to ld.lld since it is the default. 
llvm-svn: 253437
 2015-11-18 06:11:01 +00:00
Rafael Espindola 4b1285c55a Rename test/elf2 to test/ELF. 
llvm-svn: 253313
 2015-11-17 05:36:42 +00:00