[compiler-rt] r351989 - hwasan: Read shadow address from ifunc if we don't need a frame record.

[Peter Collingbourne via llvm-commits]

Author: pcc
Date: Wed Jan 23 14:39:11 2019
New Revision: 351989

URL: http://llvm.org/viewvc/llvm-project?rev=351989&view=rev
Log:
hwasan: Read shadow address from ifunc if we don't need a frame record.

This saves a cbz+cold call in the interceptor ABI, as well as a realign
in both ABIs, trading off a dcache entry against some branch predictor
entries and some code size.

Unfortunately the functionality is hidden behind a flag because ifunc is
known to be broken on static binaries on Android.

Differential Revision: https://reviews.llvm.org/D57084

Modified:
    compiler-rt/trunk/test/hwasan/lit.cfg

Modified: compiler-rt/trunk/test/hwasan/lit.cfg
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/hwasan/lit.cfg?rev=351989&r1=351988&r2=351989&view=diff
==============================================================================
--- compiler-rt/trunk/test/hwasan/lit.cfg (original)
+++ compiler-rt/trunk/test/hwasan/lit.cfg Wed Jan 23 14:39:11 2019
@@ -11,7 +11,8 @@ config.test_source_root = os.path.dirnam
 # Setup default compiler flags used with -fsanitize=memory option.
 clang_cflags = [config.target_cflags] + config.debug_info_flags
 clang_cxxflags = config.cxx_mode_flags + clang_cflags
-clang_hwasan_cflags = ["-fsanitize=hwaddress", "-mllvm", "-hwasan-generate-tags-with-calls"] + clang_cflags
+clang_hwasan_cflags = ["-fsanitize=hwaddress", "-mllvm", "-hwasan-generate-tags-with-calls",
+                       "-mllvm", "-hwasan-allow-ifunc"] + clang_cflags
 clang_hwasan_cxxflags = config.cxx_mode_flags + clang_hwasan_cflags
 
 def build_invocation(compile_flags):