[lsan] Add __lsan_default_options

For consistency with asan, msan, tsan and ubsan.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@314048 91177308-0d34-0410-b5e6-96231b3b80d8

7 files changed, 36 insertions, 0 deletions

diff --git a/include/sanitizer/lsan_interface.h b/include/sanitizer/lsan_interface.h
index 1f2e58909..e3e509ff7 100644
--- a/include/sanitizer/lsan_interface.h
+++ b/include/sanitizer/lsan_interface.h
@@ -68,6 +68,10 @@ extern "C" {
   // __attribute__((used))
   int __lsan_is_turned_off();
 
+  // This function may be optionally provided by user and should return
+  // a string containing LSan runtime options. See lsan_flags.inc for details.
+  const char *__lsan_default_options();
+
   // This function may be optionally provided by the user and should return
   // a string containing LSan suppressions.
   const char *__lsan_default_suppressions();
diff --git a/lib/asan/asan_flags.cc b/lib/asan/asan_flags.cc
index 6be0d6e94..d3efadc54 100644
--- a/lib/asan/asan_flags.cc
+++ b/lib/asan/asan_flags.cc
@@ -118,6 +118,10 @@ void InitializeFlags() {
   const char *ubsan_default_options = __ubsan::MaybeCallUbsanDefaultOptions();
   ubsan_parser.ParseString(ubsan_default_options);
 #endif
+#if CAN_SANITIZE_LEAKS
+  const char *lsan_default_options = __lsan::MaybeCallLsanDefaultOptions();
+  lsan_parser.ParseString(lsan_default_options);
+#endif
 
   // Override from command line.
   asan_parser.ParseString(GetEnv("ASAN_OPTIONS"));
diff --git a/lib/lsan/lsan.cc b/lib/lsan/lsan.cc
index a51a63ba8..603050aae 100644
--- a/lib/lsan/lsan.cc
+++ b/lib/lsan/lsan.cc
@@ -56,6 +56,9 @@ static void InitializeFlags() {
   RegisterLsanFlags(&parser, f);
   RegisterCommonFlags(&parser);
 
+  // Override from user-specified string.
+  const char *lsan_default_options = MaybeCallLsanDefaultOptions();
+  parser.ParseString(lsan_default_options);
   parser.ParseString(GetEnv("LSAN_OPTIONS"));
 
   SetVerbosity(common_flags()->verbosity);
diff --git a/lib/lsan/lsan_common.cc b/lib/lsan/lsan_common.cc
index b9b6fe086..622aae734 100644
--- a/lib/lsan/lsan_common.cc
+++ b/lib/lsan/lsan_common.cc
@@ -107,6 +107,10 @@ void InitializeRootRegions() {
   root_regions = new(placeholder) InternalMmapVector<RootRegion>(1);
 }
 
+const char *MaybeCallLsanDefaultOptions() {
+  return (&__lsan_default_options) ? __lsan_default_options() : "";
+}
+
 void InitCommonLsan() {
   InitializeRootRegions();
   if (common_flags()->detect_leaks) {
@@ -856,6 +860,11 @@ int __lsan_do_recoverable_leak_check() {
 
 #if !SANITIZER_SUPPORTS_WEAK_HOOKS
 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+const char * __lsan_default_options() {
+  return "";
+}
+
+SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
 int __lsan_is_turned_off() {
   return 0;
 }
diff --git a/lib/lsan/lsan_common.h b/lib/lsan/lsan_common.h
index 1bb3e4198..5adcaad56 100644
--- a/lib/lsan/lsan_common.h
+++ b/lib/lsan/lsan_common.h
@@ -143,6 +143,7 @@ enum IgnoreObjectResult {
 };
 
 // Functions called from the parent tool.
+const char *MaybeCallLsanDefaultOptions();
 void InitCommonLsan();
 void DoLeakCheck();
 void DoRecoverableLeakCheckVoid();
@@ -251,6 +252,9 @@ class LsanMetadata {
 
 extern "C" {
 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+const char *__lsan_default_options();
+
+SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
 int __lsan_is_turned_off();
 
 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
diff --git a/lib/lsan/weak_symbols.txt b/lib/lsan/weak_symbols.txt
index da4f994da..692255679 100644
--- a/lib/lsan/weak_symbols.txt
+++ b/lib/lsan/weak_symbols.txt
@@ -1,2 +1,3 @@
+___lsan_default_options
 ___lsan_default_suppressions
 ___lsan_is_turned_off
diff --git a/test/lsan/TestCases/default_options.cc b/test/lsan/TestCases/default_options.cc
new file mode 100644
index 000000000..b5361c0cf
--- /dev/null
+++ b/test/lsan/TestCases/default_options.cc
@@ -0,0 +1,11 @@
+// RUN: %clangxx_lsan -O2 %s -o %t && %run %t 2>&1 | FileCheck %s
+
+extern "C"
+const char *__lsan_default_options() {
+  // CHECK: Available flags for {{Leak|Address}}Sanitizer:
+  return "verbosity=1 help=1";
+}
+
+int main() {
+  return 0;
+}