[sanitizer] Split coverage into separate RT in sanitizer_common

Summary:
`sanitizer_common`'s coverage support is fairly well separated, and libcdep by
default. Several sanitizers don't make use of coverage, and as far as I can
tell do no benefit from the extra dependencies pulled in by the coverage public
interface functions.

The following sanitizers call `InitializeCoverage` explicitely: MSan, ASan,
LSan, HWAsan, UBSan. On top of this, any sanitizer bundling RTUBSan should
add the coverage RT as well: ASan, Scudo, UBSan, CFI (diag), TSan, MSan, HWAsan.

So in the end the following have no need: DFSan, ESan, CFI, SafeStack (nolibc
anyway), XRay, and the upcoming Scudo minimal runtime.

I tested this with all the sanitizers check-* with gcc & clang, and in
standalone on Linux & Android, and there was no issue. I couldn't test this on
Mac, Fuchsia, BSDs, & Windows for lack of an environment, so adding a bunch of
people for additional scrunity. I couldn't test HWAsan either.

Reviewers: eugenis, vitalybuka, alekseyshl, flowerhack, kubamracek, dberris, rnk, krytarowski

Reviewed By: vitalybuka, alekseyshl, flowerhack, dberris

Subscribers: mgorny, delcypher, #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D44701

llvm-svn: 328204

11 files changed, 34 insertions, 6 deletions

diff --git a/compiler-rt/lib/asan/CMakeLists.txt b/compiler-rt/lib/asan/CMakeLists.txt
index fbd72f69298..31747adfcbc 100644
--- a/compiler-rt/lib/asan/CMakeLists.txt
+++ b/compiler-rt/lib/asan/CMakeLists.txt
@@ -125,6 +125,7 @@ if(APPLE)
                 RTInterception
                 RTSanitizerCommon
                 RTSanitizerCommonLibc
+                RTSanitizerCommonCoverage
                 RTLSanCommon
                 RTUbsan
     CFLAGS ${ASAN_DYNAMIC_CFLAGS}
@@ -138,6 +139,7 @@ else()
     RTInterception
     RTSanitizerCommon
     RTSanitizerCommonLibc
+    RTSanitizerCommonCoverage
     RTLSanCommon
     RTUbsan)
 
diff --git a/compiler-rt/lib/asan/tests/CMakeLists.txt b/compiler-rt/lib/asan/tests/CMakeLists.txt
index 7c2cf5b1b57..3b1ceddc11a 100644
--- a/compiler-rt/lib/asan/tests/CMakeLists.txt
+++ b/compiler-rt/lib/asan/tests/CMakeLists.txt
@@ -251,6 +251,7 @@ if(COMPILER_RT_CAN_EXECUTE_TESTS AND NOT ANDROID)
         $<TARGET_OBJECTS:RTInterception.osx>
         $<TARGET_OBJECTS:RTSanitizerCommon.osx>
         $<TARGET_OBJECTS:RTSanitizerCommonLibc.osx>
+        $<TARGET_OBJECTS:RTSanitizerCommonCoverage.osx>
         $<TARGET_OBJECTS:RTLSanCommon.osx>
         $<TARGET_OBJECTS:RTUbsan.osx>)
     else()
@@ -260,6 +261,7 @@ if(COMPILER_RT_CAN_EXECUTE_TESTS AND NOT ANDROID)
         $<TARGET_OBJECTS:RTInterception.${arch}>
         $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
         $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>
+        $<TARGET_OBJECTS:RTSanitizerCommonCoverage.${arch}>
         $<TARGET_OBJECTS:RTLSanCommon.${arch}>
         $<TARGET_OBJECTS:RTUbsan.${arch}>
         $<TARGET_OBJECTS:RTUbsan_cxx.${arch}>)
@@ -283,6 +285,7 @@ if(ANDROID)
       $<TARGET_OBJECTS:RTInterception.${arch}>
       $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
       $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>
+      $<TARGET_OBJECTS:RTSanitizerCommonCoverage.${arch}>
       $<TARGET_OBJECTS:RTUbsan.${arch}>
       $<TARGET_OBJECTS:RTUbsan_cxx.${arch}>
       ${COMPILER_RT_GTEST_SOURCE}
diff --git a/compiler-rt/lib/cfi/CMakeLists.txt b/compiler-rt/lib/cfi/CMakeLists.txt
index 6c531445626..934f1211867 100644
--- a/compiler-rt/lib/cfi/CMakeLists.txt
+++ b/compiler-rt/lib/cfi/CMakeLists.txt
@@ -30,6 +30,7 @@ if(OS_NAME MATCHES "Linux")
       OBJECT_LIBS RTInterception
                   RTSanitizerCommon
                   RTSanitizerCommonLibc
+                  RTSanitizerCommonCoverage
                   RTUbsan
       CFLAGS ${CFI_CFLAGS} ${CFI_DIAG_CFLAGS}
       PARENT_TARGET cfi)
diff --git a/compiler-rt/lib/hwasan/CMakeLists.txt b/compiler-rt/lib/hwasan/CMakeLists.txt
index 15013c09cdf..34f5f15b9f2 100644
--- a/compiler-rt/lib/hwasan/CMakeLists.txt
+++ b/compiler-rt/lib/hwasan/CMakeLists.txt
@@ -78,7 +78,8 @@ foreach(arch ${HWASAN_SUPPORTED_ARCH})
                 RTInterception
                 RTSanitizerCommon
                 RTSanitizerCommonLibc
-		RTUbsan
+                RTSanitizerCommonCoverage
+                RTUbsan
     CFLAGS ${HWASAN_RTL_CFLAGS}
     PARENT_TARGET hwasan)
   add_compiler_rt_runtime(clang_rt.hwasan_cxx
@@ -112,7 +113,8 @@ foreach(arch ${HWASAN_SUPPORTED_ARCH})
             RTInterception
             RTSanitizerCommon
             RTSanitizerCommonLibc
-	    RTUbsan
+            RTSanitizerCommonCoverage
+            RTUbsan
             # The only purpose of RTHWAsan_dynamic_version_script_dummy is to
             # carry a dependency of the shared runtime on the version script.
             # Replacing it with a straightforward
diff --git a/compiler-rt/lib/lsan/CMakeLists.txt b/compiler-rt/lib/lsan/CMakeLists.txt
index 60da3e18687..86b2bc1e3ad 100644
--- a/compiler-rt/lib/lsan/CMakeLists.txt
+++ b/compiler-rt/lib/lsan/CMakeLists.txt
@@ -43,6 +43,7 @@ if(COMPILER_RT_HAS_LSAN)
                   RTInterception
                   RTSanitizerCommon
                   RTSanitizerCommonLibc
+                  RTSanitizerCommonCoverage
       CFLAGS ${LSAN_CFLAGS}
       LINK_FLAGS ${SANITIZER_COMMON_LINK_FLAGS} ${WEAK_SYMBOL_LINK_FLAGS}
       LINK_LIBS ${LSAN_LINK_LIBS}
@@ -56,6 +57,7 @@ if(COMPILER_RT_HAS_LSAN)
                 $<TARGET_OBJECTS:RTInterception.${arch}>
                 $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
                 $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>
+                $<TARGET_OBJECTS:RTSanitizerCommonCoverage.${arch}>
                 $<TARGET_OBJECTS:RTLSanCommon.${arch}>
         CFLAGS ${LSAN_CFLAGS}
         PARENT_TARGET lsan)
diff --git a/compiler-rt/lib/msan/CMakeLists.txt b/compiler-rt/lib/msan/CMakeLists.txt
index 61c7bd7e58b..ebe0b64d176 100644
--- a/compiler-rt/lib/msan/CMakeLists.txt
+++ b/compiler-rt/lib/msan/CMakeLists.txt
@@ -40,6 +40,7 @@ foreach(arch ${MSAN_SUPPORTED_ARCH})
             $<TARGET_OBJECTS:RTInterception.${arch}>
             $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
             $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>
+            $<TARGET_OBJECTS:RTSanitizerCommonCoverage.${arch}>
             $<TARGET_OBJECTS:RTUbsan.${arch}>
     CFLAGS ${MSAN_RTL_CFLAGS}
     PARENT_TARGET msan)
diff --git a/compiler-rt/lib/sanitizer_common/CMakeLists.txt b/compiler-rt/lib/sanitizer_common/CMakeLists.txt
index ca82458887c..563dca3f720 100644
--- a/compiler-rt/lib/sanitizer_common/CMakeLists.txt
+++ b/compiler-rt/lib/sanitizer_common/CMakeLists.txt
@@ -64,10 +64,6 @@ set(SANITIZER_NOLIBC_SOURCES
 set(SANITIZER_LIBCDEP_SOURCES
   sanitizer_common_libcdep.cc
   sanitizer_allocator_checks.cc
-  sancov_flags.cc
-  sanitizer_coverage_fuchsia.cc
-  sanitizer_coverage_libcdep_new.cc
-  sanitizer_coverage_win_sections.cc
   sanitizer_linux_libcdep.cc
   sanitizer_mac_libcdep.cc
   sanitizer_posix_libcdep.cc
@@ -77,6 +73,12 @@ set(SANITIZER_LIBCDEP_SOURCES
   sanitizer_symbolizer_posix_libcdep.cc
   sanitizer_unwind_linux_libcdep.cc)
 
+set(SANITIZER_COVERAGE_SOURCES
+  sancov_flags.cc
+  sanitizer_coverage_fuchsia.cc
+  sanitizer_coverage_libcdep_new.cc
+  sanitizer_coverage_win_sections.cc)
+
 # Explicitly list all sanitizer_common headers. Not all of these are
 # included in sanitizer_common source files, but we need to depend on
 # headers when building our custom unit tests.
@@ -208,6 +210,12 @@ add_compiler_rt_object_libraries(RTSanitizerCommonLibc
   SOURCES ${SANITIZER_LIBCDEP_SOURCES}
   CFLAGS ${SANITIZER_CFLAGS}
   DEFS ${SANITIZER_COMMON_DEFINITIONS})
+add_compiler_rt_object_libraries(RTSanitizerCommonCoverage
+  ${OS_OPTION}
+  ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
+  SOURCES ${SANITIZER_COVERAGE_SOURCES}
+  CFLAGS ${SANITIZER_CFLAGS}
+  DEFS ${SANITIZER_COMMON_DEFINITIONS})
 
 set(SANITIZER_NO_WEAK_HOOKS_CFLAGS ${SANITIZER_CFLAGS})
 list(APPEND SANITIZER_NO_WEAK_HOOKS_CFLAGS "-DSANITIZER_SUPPORTS_WEAK_HOOKS=0")
diff --git a/compiler-rt/lib/scudo/CMakeLists.txt b/compiler-rt/lib/scudo/CMakeLists.txt
index 0aba0cad1b7..97a26fa4230 100644
--- a/compiler-rt/lib/scudo/CMakeLists.txt
+++ b/compiler-rt/lib/scudo/CMakeLists.txt
@@ -51,6 +51,7 @@ if(COMPILER_RT_HAS_SCUDO)
     SOURCES ${SCUDO_SOURCES}
     OBJECT_LIBS RTSanitizerCommonNoTermination
                 RTSanitizerCommonLibc
+                RTSanitizerCommonCoverage
                 RTInterception
                 RTUbsan
     CFLAGS ${SCUDO_CFLAGS}
@@ -70,6 +71,7 @@ if(COMPILER_RT_HAS_SCUDO)
     SOURCES ${SCUDO_SOURCES} ${SCUDO_CXX_SOURCES}
     OBJECT_LIBS RTSanitizerCommonNoTermination
                 RTSanitizerCommonLibc
+                RTSanitizerCommonCoverage
                 RTInterception
                 RTUbsan
                 RTUbsan_cxx
diff --git a/compiler-rt/lib/tsan/CMakeLists.txt b/compiler-rt/lib/tsan/CMakeLists.txt
index 11ec9d8cff8..9dbd6e9204f 100644
--- a/compiler-rt/lib/tsan/CMakeLists.txt
+++ b/compiler-rt/lib/tsan/CMakeLists.txt
@@ -114,6 +114,7 @@ if(APPLE)
     OBJECT_LIBS RTInterception
                 RTSanitizerCommon
                 RTSanitizerCommonLibc
+                RTSanitizerCommonCoverage
                 RTUbsan
     CFLAGS ${TSAN_RTL_CFLAGS}
     LINK_FLAGS ${SANITIZER_COMMON_LINK_FLAGS} ${WEAK_SYMBOL_LINK_FLAGS}
@@ -163,6 +164,7 @@ else()
               $<TARGET_OBJECTS:RTInterception.${arch}>
               $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
               $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>
+              $<TARGET_OBJECTS:RTSanitizerCommonCoverage.${arch}>
               $<TARGET_OBJECTS:RTUbsan.${arch}>
       CFLAGS ${TSAN_RTL_CFLAGS}
       PARENT_TARGET tsan)
diff --git a/compiler-rt/lib/tsan/tests/CMakeLists.txt b/compiler-rt/lib/tsan/tests/CMakeLists.txt
index ad8d02ed331..a451febef18 100644
--- a/compiler-rt/lib/tsan/tests/CMakeLists.txt
+++ b/compiler-rt/lib/tsan/tests/CMakeLists.txt
@@ -22,6 +22,7 @@ if(APPLE)
     $<TARGET_OBJECTS:RTInterception.osx>
     $<TARGET_OBJECTS:RTSanitizerCommon.osx>
     $<TARGET_OBJECTS:RTSanitizerCommonLibc.osx>
+    $<TARGET_OBJECTS:RTSanitizerCommonCoverage.osx>
     $<TARGET_OBJECTS:RTUbsan.osx>)
   set(TSAN_TEST_RUNTIME RTTsanTest)
   add_library(${TSAN_TEST_RUNTIME} STATIC ${TSAN_TEST_RUNTIME_OBJECTS})
diff --git a/compiler-rt/lib/ubsan/CMakeLists.txt b/compiler-rt/lib/ubsan/CMakeLists.txt
index 911bd3ebc6b..04618030ecc 100644
--- a/compiler-rt/lib/ubsan/CMakeLists.txt
+++ b/compiler-rt/lib/ubsan/CMakeLists.txt
@@ -76,6 +76,7 @@ if(APPLE)
                   RTUbsan_standalone
                   RTSanitizerCommon
                   RTSanitizerCommonLibc
+                  RTSanitizerCommonCoverage
                   RTInterception
       LINK_FLAGS ${WEAK_SYMBOL_LINK_FLAGS}
       PARENT_TARGET ubsan)
@@ -88,6 +89,7 @@ if(APPLE)
                   RTUbsan_standalone
                   RTSanitizerCommonNoHooks
                   RTSanitizerCommonLibcNoHooks
+                  RTSanitizerCommonCoverage
                   RTInterception
       LINK_FLAGS ${WEAK_SYMBOL_LINK_FLAGS}
       PARENT_TARGET ubsan)
@@ -154,6 +156,7 @@ else()
       SOURCES ubsan_init_standalone_preinit.cc
       OBJECT_LIBS RTSanitizerCommon
               RTSanitizerCommonLibc
+              RTSanitizerCommonCoverage
               RTUbsan
               RTUbsan_standalone
               RTInterception
@@ -173,6 +176,7 @@ else()
         ARCHS ${UBSAN_SUPPORTED_ARCH}
         OBJECT_LIBS RTSanitizerCommon
               RTSanitizerCommonLibc
+              RTSanitizerCommonCoverage
               RTUbsan
               RTUbsan_cxx
               RTUbsan_standalone