[Sanitizers, CMake] Basic sanitizer Solaris support (PR 33274)

[ro]

Summary

This patch, on top of https://reviews.llvm.org/D40898, contains the build system
changes necessary to enable the Solaris/x86 sanitizer port.

The only issue of note is the libclang_rt.sancov_{begin, end} libraries: clang relies on the
linker automatically defining start_SECNAME and stop_SECNAME labels for
sections whose names are valid C identifiers. This is a GNU ld extension not present
in the ELF gABI, also implemented by gold and lld, but not by Solaris ld. To work around
this, I automatically link the sancov_{begin,end} libraries into every executable for now.
There seems to be now way to build individual startup objects like crtbegin.o/crtend.o,
so I've followed the lead of libclang_rt.asan-preinit which also contains just a single
object.

[kcc]

lib/sanitizer_common/CMakeLists.txt

221

Please explain why you do this in the comments.

[ro]

Explain SancovBegin/SancovEnd libraries.

[ro]

Rebased, accounting for the new sanitizer_platform_limits_solaris.{cc,h} files.

Could someone please commit this for me? Thanks.

[alekseyshl]

Just to double check, this patch does not depend on any other and can be committed, right?

[ro]

Right, it's independent of the few outstanding ones.

cmake/config-ix.cmake

 endif()
 
 set(ALL_SANITIZERS asan;dfsan;msan;tsan;safestack;cfi;esan;scudo;ubsan_minimal)
 set(COMPILER_RT_SANITIZERS_TO_BUILD all CACHE STRING
     "sanitizers to build if supported on the target (all;${ALL_SANITIZERS})")
 list_replace(COMPILER_RT_SANITIZERS_TO_BUILD all "${ALL_SANITIZERS}")
 
 if (SANITIZER_COMMON_SUPPORTED_ARCH AND NOT LLVM_USE_SANITIZER AND
-    (OS_NAME MATCHES "Android|Darwin|Linux|FreeBSD|NetBSD|Fuchsia" OR
+    (OS_NAME MATCHES "Android|Darwin|Linux|FreeBSD|NetBSD|Fuchsia|SunOS" OR
     (OS_NAME MATCHES "Windows" AND (NOT MINGW AND NOT CYGWIN))))
   set(COMPILER_RT_HAS_SANITIZER_COMMON TRUE)
 else()
   set(COMPILER_RT_HAS_SANITIZER_COMMON FALSE)
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON)
   set(COMPILER_RT_HAS_INTERCEPTION TRUE)
 else()
   set(COMPILER_RT_HAS_INTERCEPTION FALSE)
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND ASAN_SUPPORTED_ARCH)
   set(COMPILER_RT_HAS_ASAN TRUE)
 else()
   set(COMPILER_RT_HAS_ASAN FALSE)
 endif()
 
-if (OS_NAME MATCHES "Linux|FreeBSD|Windows|NetBSD")
+if (OS_NAME MATCHES "Linux|FreeBSD|Windows|NetBSD|SunOS")
   set(COMPILER_RT_ASAN_HAS_STATIC_RUNTIME TRUE)
 else()
   set(COMPILER_RT_ASAN_HAS_STATIC_RUNTIME FALSE)
 endif()
 
 # TODO: Add builtins support.
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND DFSAN_SUPPORTED_ARCH AND

 if (COMPILER_RT_HAS_SANITIZER_COMMON AND TSAN_SUPPORTED_ARCH AND
     OS_NAME MATCHES "Darwin|Linux|FreeBSD|Android|NetBSD")
   set(COMPILER_RT_HAS_TSAN TRUE)
 else()
   set(COMPILER_RT_HAS_TSAN FALSE)
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND UBSAN_SUPPORTED_ARCH AND
-    OS_NAME MATCHES "Darwin|Linux|FreeBSD|NetBSD|Windows|Android|Fuchsia")
+    OS_NAME MATCHES "Darwin|Linux|FreeBSD|NetBSD|Windows|Android|Fuchsia|SunOS")
   set(COMPILER_RT_HAS_UBSAN TRUE)
 else()
   set(COMPILER_RT_HAS_UBSAN FALSE)
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND UBSAN_SUPPORTED_ARCH AND
     OS_NAME MATCHES "Linux|FreeBSD|NetBSD|Android|Darwin")
   set(COMPILER_RT_HAS_UBSAN_MINIMAL TRUE)

lib/asan/CMakeLists.txt

else()
 
   foreach(arch ${ASAN_SUPPORTED_ARCH})
     if (UNIX)
       add_sanitizer_rt_version_list(clang_rt.asan-dynamic-${arch}
                                     LIBS clang_rt.asan-${arch} clang_rt.asan_cxx-${arch}
                                     EXTRA asan.syms.extra)
       set(VERSION_SCRIPT_FLAG
            -Wl,--version-script,${CMAKE_CURRENT_BINARY_DIR}/clang_rt.asan-dynamic-${arch}.vers)
+      # The Solaris 11.4 linker supports a subset of GNU ld version scripts,
+      # but requires a special option to enable it.
+      if (OS_NAME MATCHES "SunOS")
+          list(APPEND VERSION_SCRIPT_FLAG -Wl,-z,gnu-version-script-compat)
+      endif()
       set_property(SOURCE
         ${CMAKE_CURRENT_BINARY_DIR}/dummy.cc
         APPEND PROPERTY
         OBJECT_DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/clang_rt.asan-dynamic-${arch}.vers)
     else()
       set(VERSION_SCRIPT_FLAG)
     endif()
 

lib/asan/scripts/asan_symbolize.py

if suffix:
     if os.access(filename, os.F_OK):
       return BreakpadSymbolizer(filename)
   return None
 
 
 def SystemSymbolizerFactory(system, addr, binary, arch):
   if system == 'Darwin':
     return DarwinSymbolizer(addr, binary, arch)
-  elif system in ['Linux', 'FreeBSD', 'NetBSD']:
+  elif system in ['Linux', 'FreeBSD', 'NetBSD', 'SunOS']:
     return Addr2LineSymbolizer(binary)
 
 
 class BreakpadSymbolizer(Symbolizer):
   def __init__(self, filename):
     super(BreakpadSymbolizer, self).__init__()
     self.filename = filename
     lines = file(filename).readlines()
if sys.platform == 'win32':
       # even in sandboxed processes.  Nothing needs to be done here.
       self.process_line = self.process_line_echo
     else:
       # Used by clients who may want to supply a different binary name.
       # E.g. in Chrome several binaries may share a single .dSYM.
       self.binary_name_filter = binary_name_filter
       self.dsym_hint_producer = dsym_hint_producer
       self.system = os.uname()[0]
-      if self.system not in ['Linux', 'Darwin', 'FreeBSD', 'NetBSD']:
+      if self.system not in ['Linux', 'Darwin', 'FreeBSD', 'NetBSD','SunOS']:
         raise Exception('Unknown system')
       self.llvm_symbolizers = {}
       self.last_llvm_symbolizer = None
       self.dsym_hints = set([])
       self.frame_no = 0
       self.process_line = self.process_line_posix
 
   def symbolize_address(self, addr, binary, offset, arch):

lib/sanitizer_common/CMakeLists.txt

set(SANITIZER_SOURCES_NOTERMINATION
   sanitizer_platform_limits_netbsd.cc
   sanitizer_platform_limits_posix.cc
   sanitizer_posix.cc
   sanitizer_printf.cc
   sanitizer_procmaps_common.cc
   sanitizer_procmaps_freebsd.cc
   sanitizer_procmaps_linux.cc
   sanitizer_procmaps_mac.cc
+  sanitizer_procmaps_solaris.cc
+  sanitizer_solaris.cc
   sanitizer_stackdepot.cc
   sanitizer_stacktrace.cc
   sanitizer_stacktrace_printer.cc
   sanitizer_stoptheworld_mac.cc
   sanitizer_suppressions.cc
   sanitizer_symbolizer.cc
   sanitizer_symbolizer_fuchsia.cc
   sanitizer_symbolizer_libbacktrace.cc
   sanitizer_symbolizer_mac.cc
   sanitizer_symbolizer_win.cc
   sanitizer_tls_get_addr.cc
   sanitizer_thread_registry.cc
   sanitizer_win.cc)
 
-if(UNIX AND NOT APPLE)
+if(UNIX AND NOT APPLE AND NOT OS_NAME MATCHES "SunOS")
   list(APPEND SANITIZER_SOURCES_NOTERMINATION
     sanitizer_linux_x86_64.S)
   list(APPEND SANITIZER_SOURCES_NOTERMINATION
     sanitizer_linux_mips64.S)
 endif()
 
 set(SANITIZER_SOURCES
   ${SANITIZER_SOURCES_NOTERMINATION} sanitizer_termination.cc)
add_compiler_rt_object_libraries(RTSanitizerCommonNoHooks
   DEFS ${SANITIZER_COMMON_DEFINITIONS})
 add_compiler_rt_object_libraries(RTSanitizerCommonLibcNoHooks
   ${OS_OPTION}
   ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
   SOURCES ${SANITIZER_LIBCDEP_SOURCES}
   CFLAGS ${SANITIZER_NO_WEAK_HOOKS_CFLAGS}
   DEFS ${SANITIZER_COMMON_DEFINITIONS})
 
+if(OS_NAME MATCHES "SunOS")
+  # Solaris ld doesn't support the non-standard GNU ld extension of adding
+  # __start_SECNAME and __stop_SECNAME labels to sections whose names are
+  # valid C identifiers.  Instead we add our own definitions for the
+  # __sancov_guards section.
+  add_compiler_rt_object_libraries(SancovBegin
+    ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
+    SOURCES sancov_begin.S
+    CFLAGS ${SANITIZER_CFLAGS}
+    DEFS ${SANITIZER_COMMON_DEFINITIONS})
+
+  add_compiler_rt_runtime(clang_rt.sancov_begin
+    STATIC
+    ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
+    OBJECT_LIBS SancovBegin
+    CFLAGS ${SANITIZER_CFLAGS}
+    DEFS ${SANITIZER_COMMON_DEFINITIONS})
+
+  add_compiler_rt_object_libraries(SancovEnd
+    ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
+    SOURCES sancov_end.S
+    CFLAGS ${SANITIZER_CFLAGS}
+    DEFS ${SANITIZER_COMMON_DEFINITIONS})
+
+  add_compiler_rt_runtime(clang_rt.sancov_end
+    STATIC
+    ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
+    OBJECT_LIBS SancovEnd
+    CFLAGS ${SANITIZER_CFLAGS}
+    DEFS ${SANITIZER_COMMON_DEFINITIONS})
+endif()
+
 if(WIN32)
   add_compiler_rt_object_libraries(SanitizerCommonWeakInterception
     ${SANITIZER_COMMON_SUPPORTED_OS}
     ARCHS ${SANITIZER_COMMON_SUPPORTED_ARCH}
     SOURCES sanitizer_win_weak_interception.cc
     CFLAGS ${SANITIZER_CFLAGS} -DSANITIZER_DYNAMIC
     DEFS ${SANITIZER_COMMON_DEFINITIONS})
   add_compiler_rt_object_libraries(SancovWeakInterception

lib/sanitizer_common/sancov_begin.S

+  .type   __start___sancov_guards,@object
+  .globl    __start___sancov_guards
+        .section        __sancov_guards,"aw",@progbits
+        .p2align        2
+__start___sancov_guards:

lib/sanitizer_common/sancov_end.S

+  .type   __stop___sancov_guards,@object
+  .globl    __stop___sancov_guards
+        .section        __sancov_guards,"aw",@progbits
+        .p2align        2
+__stop___sancov_guards: