[compiler-rt][asan] Define MemToShadowSize for sparc64

[ro]

Summary

[[ https://reviews.llvm.org/D83247 | [compiler-rt][asan][hwasan] Refactor shadow setup into sanitizer_common (NFCI) ]]
broke the | Solaris/sparcv9 build:

FAILED: projects/compiler-rt/lib/asan/CMakeFiles/RTAsan.sparcv9.dir/asan_linux.cpp.o 
/opt/llvm-buildbot/bin/c++  -D_DEBUG -D_FILE_OFFSET_BITS=64 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/asan -I/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/asan -Iinclude -I/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/include -I/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/include/llvm/Support/Solaris -I/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/asan/.. -fPIC -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -fdiagnostics-color -ffunction-sections -fdata-sections -Wall -std=c++14 -Wno-unused-parameter -O3     -m64 -fPIC -fno-builtin -fno-exceptions -fomit-frame-pointer -funwind-tables -fno-stack-protector -fvisibility=hidden -fno-lto -O3 -g -Wno-variadic-macros -Wno-non-virtual-dtor -fno-rtti -UNDEBUG -std=c++14 -MD -MT projects/compiler-rt/lib/asan/CMakeFiles/RTAsan.sparcv9.dir/asan_linux.cpp.o -MF projects/compiler-rt/lib/asan/CMakeFiles/RTAsan.sparcv9.dir/asan_linux.cpp.o.d -o projects/compiler-rt/lib/asan/CMakeFiles/RTAsan.sparcv9.dir/asan_linux.cpp.o -c /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/asan/asan_linux.cpp
/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/asan/asan_linux.cpp: In function ‘__sanitizer::uptr __asan::FindDynamicShadowStart()’:
/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/asan/asan_linux.cpp:103:28: error: ‘MemToShadowSize’ was not declared in this scope
   uptr shadow_size_bytes = MemToShadowSize(kHighMemEnd);
                            ^~~~~~~~~~~~~~~
/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/asan/asan_linux.cpp:103:28: note: suggested alternative: ‘MemToShadow’
   uptr shadow_size_bytes = MemToShadowSize(kHighMemEnd);
                            ^~~~~~~~~~~~~~~
                            MemToShadow

Fixed by also definining MemToShadowSize in compiler-rt/lib/asan/asan_mapping_sparc64.h.

Tested on sparcv9-sun-solaris2.11.

Will commit as obvious shortly: it unbreaks the buildbot and can only affect sparc64.
Should a different solution without the duplication be desired, that can be added later.

[tejohnson]

Oddly, I didn't get a bot failure notification for this one - do you know if it was it hidden behind another failure that showed up earlier?

I'll send another patch to simply move MemToShadowSize up earlier in asan_mapping.h to cover all the cases.

[tejohnson]

Nevermind, I see Vitaly beat me to this in e412cc402e84444ff13cc4e4ae4c2c5830f9d9da. Thanks all!

[ro]

In D84004#2158502, @tejohnson wrote:

Oddly, I didn't get a bot failure notification for this one - do you know if it was it hidden behind another failure that showed up earlier?

You didn't miss anything: the Solaris buildbots are driven by the silent buildmaster, so there are no build breakage notifications.
There are a couple of test failures that I haven't been able to tackle in some time, so the buildbots had to be moved away from the regular
buildmaster.

I consider the current system (no failures -> green, any kind of failure -> red) as far too simplistic: while I can get work done with an
additional testsuite failure or two, if the build is broken, nothing can be done before that is fixed. Treating both scenarios the same feels
very wrong to me.

compiler-rt/lib/asan/asan_mapping_sparc64.h

 #define kShadowGap2Beg 0
 #define kShadowGap2End 0
 
 #define kShadowGap3Beg 0
 #define kShadowGap3End 0
 
 namespace __asan {
 
+static inline uptr MemToShadowSize(uptr size) { return size >> SHADOW_SCALE; }
 static inline bool AddrIsInLowMem(uptr a) {
   PROFILE_ASAN_MAPPING();
   return a <= kLowMemEnd;
 }
 
 static inline bool AddrIsInLowShadow(uptr a) {
   PROFILE_ASAN_MAPPING();
   return a >= kLowShadowBeg && a <= kLowShadowEnd;