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Author SHA1 Message Date
Fangrui Song 5771c98562 [XRay] Change xray_instr_map sled addresses from absolute to PC relative for x86-64 
xray_instr_map contains absolute addresses of sleds, which are relocated
by `R_*_RELATIVE` when linked in -pie or -shared mode.

By making these addresses relative to PC, we can avoid the dynamic
relocations and remove the SHF_WRITE flag from xray_instr_map.  We can
thus save VM pages containg xray_instr_map (because they are not
modified).

This patch changes x86-64 and bumps the sled version to 2. Subsequent
changes will change powerpc64le and AArch64.

Reviewed By: dberris, ianlevesque

Differential Revision: https://reviews.llvm.org/D78082
 2020-04-21 09:36:09 -07:00
Fangrui Song 4113e388c8 [XRay] Define uint64_t Address = Sled.Address; NFC 
This makes it easy to change the address stored in a sled from an
absolute address to a PC-relative address.
 2020-04-13 22:44:12 -07:00
Nico Weber b301860321 compiler-rt: Rename .cc file in lib/xray to .cpp 
Like r367463, but for xray.

llvm-svn: 367546
 2019-08-01 12:30:58 +00:00