[sanitizer] Split dll_thunks into different sanitizers.

When the sanitizer is implemented as a static library and is included in the
main executable, we need an auxiliary static library dll_thunk that will be
linked to the dlls that have instrumentation, so they can refer to the runtime
in the main executable. Basically, it uses interception to get a pointer the
function in the main executable and override its function with that pointer.

Before this diff, all of the implementation for dll_thunks was included in asan.
In this diff I split it into different sanitizers, so we can use other
sanitizers regardless of whether we include asan or not.

All the sanitizers include a file sanitizer_win_dll_thunk.cc that register
functions to be intercepted in the binary section: DLLTH

When the dll including dll_thunk is initialized, it will execute
__dll_thunk_init() implemented in: sanitizer_common/sanitizer_win_dll_thunk.cc,
which will consider all the CB registered in the section DLLTH. So, all the
functions registered will be intercepted, and redirected to the implementation
in the main executable.

All the files "sanitizer_win_dll_thunk.cc" are independent, so we don't need to
include a specific list of sanitizers. Now, we compile:  asan_win_dll_thunk.cc
ubsan_win_dll_thunk.cc,  sanitizer_coverage_win_dll_thunk.cc and
sanitizer_win_dll_thunk.cc, to generate asan_dll_thunk, because we include asan,
ubsan and sanitizer coverage in the address sanitizer library.

Differential Revision: https://reviews.llvm.org/D29154

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@293951 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/sanitizer_common/CMakeLists.txt b/lib/sanitizer_common/CMakeLists.txt
index c70b8be6d..fd6902b4b 100644
--- a/lib/sanitizer_common/CMakeLists.txt
+++ b/lib/sanitizer_common/CMakeLists.txt
@@ -128,6 +128,8 @@ set(SANITIZER_HEADERS
   sanitizer_syscall_linux_aarch64.inc
   sanitizer_thread_registry.h)
 
+include_directories(..)
+
 set(SANITIZER_COMMON_DEFINITIONS)
 
 include(CheckIncludeFile)
@@ -184,6 +186,21 @@ add_compiler_rt_object_libraries(RTSanitizerCommonLibc
   CFLAGS ${SANITIZER_CFLAGS}
   DEFS ${SANITIZER_COMMON_DEFINITIONS})
 
+if(MSVC)
+  add_compiler_rt_object_libraries(SanitizerCommonDllThunk
+    ${SANITIZER_COMMON_SUPPORTED_OS}
+    ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
+    SOURCES sanitizer_win_dll_thunk.cc
+    CFLAGS ${SANITIZER_CFLAGS} -DSANITIZER_DLL_THUNK
+    DEFS ${SANITIZER_COMMON_DEFINITIONS})
+  add_compiler_rt_object_libraries(SancovDllThunk
+    ${SANITIZER_COMMON_SUPPORTED_OS}
+    ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
+    SOURCES sanitizer_coverage_win_dll_thunk.cc
+    CFLAGS ${SANITIZER_CFLAGS} -DSANITIZER_DLL_THUNK
+    DEFS ${SANITIZER_COMMON_DEFINITIONS})
+endif()
+
 # Unit tests for common sanitizer runtime.
 if(COMPILER_RT_INCLUDE_TESTS)
   add_subdirectory(tests)