[compiler-rt] Remove support and workarounds for Android 4 and older (#124056)

compiler-rt/lib/asan/tests/asan_test.cpp

@@ -1166,13 +1166,9 @@ TEST(AddressSanitizer, DISABLED_StressStackReuseAndExceptionsTest) {
 
 #if !defined(_WIN32)
 TEST(AddressSanitizer, MlockTest) {
-#if !defined(__ANDROID__) || __ANDROID_API__ >= 17
   EXPECT_EQ(0, mlockall(MCL_CURRENT));
-#endif
-  EXPECT_EQ(0, mlock((void*)0x12345, 0x5678));
-#if !defined(__ANDROID__) || __ANDROID_API__ >= 17
+  EXPECT_EQ(0, mlock((void *)0x12345, 0x5678));
   EXPECT_EQ(0, munlockall());
-#endif
   EXPECT_EQ(0, munlock((void*)0x987, 0x654));
 }
 #endif

compiler-rt/lib/lsan/lsan_common_linux.cpp

@@ -93,11 +93,6 @@ static int ProcessGlobalRegionsCallback(struct dl_phdr_info *info, size_t size,
   return 0;
 }
 
-#if SANITIZER_ANDROID && __ANDROID_API__ < 21
-extern "C" __attribute__((weak)) int dl_iterate_phdr(
-    int (*)(struct dl_phdr_info *, size_t, void *), void *);
-#endif
-
 // Scans global variables for heap pointers.
 void ProcessGlobalRegions(Frontier *frontier) {
   if (!flags()->use_globals) return;

compiler-rt/lib/sanitizer_common/sanitizer_common.h

@@ -927,7 +927,6 @@ typedef void (*RangeIteratorCallback)(uptr begin, uptr end, void *arg);
 
 enum AndroidApiLevel {
   ANDROID_NOT_ANDROID = 0,
-  ANDROID_KITKAT = 19,
   ANDROID_LOLLIPOP_MR1 = 22,
   ANDROID_POST_LOLLIPOP = 23
 };

compiler-rt/lib/sanitizer_common/sanitizer_getauxval.h

@@ -21,22 +21,21 @@
 
 #if SANITIZER_LINUX || SANITIZER_FUCHSIA
 
-# if (__GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \
-      SANITIZER_FUCHSIA) &&                                                    \
-     !SANITIZER_GO
-#  define SANITIZER_USE_GETAUXVAL 1
-# else
-#  define SANITIZER_USE_GETAUXVAL 0
-# endif
+#  if (__GLIBC_PREREQ(2, 16) || SANITIZER_ANDROID || SANITIZER_FUCHSIA) && \
+      !SANITIZER_GO
+#    define SANITIZER_USE_GETAUXVAL 1
+#  else
+#    define SANITIZER_USE_GETAUXVAL 0
+#  endif
 
-# if SANITIZER_USE_GETAUXVAL
-#  include <sys/auxv.h>
-# else
+#  if SANITIZER_USE_GETAUXVAL
+#    include <sys/auxv.h>
+#  else
 // The weak getauxval definition allows to check for the function at runtime.
 // This is useful for Android, when compiled at a lower API level yet running
 // on a more recent platform that offers the function.
 extern "C" SANITIZER_WEAK_ATTRIBUTE unsigned long getauxval(unsigned long type);
-# endif
+#  endif
 
 #elif SANITIZER_NETBSD
 

compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

@@ -1849,11 +1849,6 @@ int internal_uname(struct utsname *buf) {
 #  endif
 
 #  if SANITIZER_ANDROID
-#    if __ANDROID_API__ < 21
-extern "C" __attribute__((weak)) int dl_iterate_phdr(
-    int (*)(struct dl_phdr_info *, size_t, void *), void *);
-#    endif
-
 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
                                    void *data) {
   // Any name starting with "lib" indicates a bug in L where library base names
@@ -1869,9 +1864,7 @@ static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
 static atomic_uint32_t android_api_level;
 
 static AndroidApiLevel AndroidDetectApiLevelStatic() {
-#    if __ANDROID_API__ <= 19
-  return ANDROID_KITKAT;
-#    elif __ANDROID_API__ <= 22
+#    if __ANDROID_API__ <= 22
   return ANDROID_LOLLIPOP_MR1;
 #    else
   return ANDROID_POST_LOLLIPOP;
@@ -1879,8 +1872,6 @@ static AndroidApiLevel AndroidDetectApiLevelStatic() {
 }
 
 static AndroidApiLevel AndroidDetectApiLevel() {
-  if (!&dl_iterate_phdr)
-    return ANDROID_KITKAT;  // K or lower
   bool base_name_seen = false;
   dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen);
   if (base_name_seen)

compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp

@@ -773,11 +773,6 @@ static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
   return 0;
 }
 
-#  if SANITIZER_ANDROID && __ANDROID_API__ < 21
-extern "C" __attribute__((weak)) int dl_iterate_phdr(
-    int (*)(struct dl_phdr_info *, size_t, void *), void *);
-#  endif
-
 static bool requiresProcmaps() {
 #  if SANITIZER_ANDROID && __ANDROID_API__ <= 22
   // Fall back to /proc/maps if dl_iterate_phdr is unavailable or broken.
@@ -940,11 +935,8 @@ extern "C" SANITIZER_WEAK_ATTRIBUTE int __android_log_write(int prio,
 void WriteOneLineToSyslog(const char *s) {
   if (&async_safe_write_log) {
     async_safe_write_log(SANITIZER_ANDROID_LOG_INFO, GetProcessName(), s);
-  } else if (AndroidGetApiLevel() > ANDROID_KITKAT) {
-    syslog(LOG_INFO, "%s", s);
   } else {
-    CHECK(&__android_log_write);
-    __android_log_write(SANITIZER_ANDROID_LOG_INFO, nullptr, s);
+    syslog(LOG_INFO, "%s", s);
   }
 }
 

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp

@@ -1093,7 +1093,7 @@ CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_len);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_level);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_type);
 
-#if SANITIZER_LINUX && (__ANDROID_API__ >= 21 || __GLIBC_PREREQ (2, 14))
+#  if SANITIZER_LINUX && (SANITIZER_ANDROID || __GLIBC_PREREQ(2, 14))
 CHECK_TYPE_SIZE(mmsghdr);
 CHECK_SIZE_AND_OFFSET(mmsghdr, msg_hdr);
 CHECK_SIZE_AND_OFFSET(mmsghdr, msg_len);