Revert r224736: "[Sanitizer] Make CommonFlags immutable after initialization."

We've got some internal users that either aren't compatible with this or
have found a bug with it. Either way, this is an isolated cleanup and so
I'm reverting it to un-block folks while we investigate. Alexey and
I will be working on fixing everything up so this can be re-committed
soon. Sorry for the noise and any inconvenience.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@225079 91177308-0d34-0410-b5e6-96231b3b80d8

7 files changed, 33 insertions, 57 deletions

diff --git a/lib/asan/asan_flags.cc b/lib/asan/asan_flags.cc
index 7db1f020c..4099de205 100644
--- a/lib/asan/asan_flags.cc
+++ b/lib/asan/asan_flags.cc
@@ -172,15 +172,13 @@ void ParseFlagsFromString(Flags *f, const char *str) {
 }
 
 void InitializeFlags(Flags *f) {
+  CommonFlags *cf = common_flags();
   SetCommonFlagsDefaults();
-  {
-    CommonFlags cf = *common_flags();
-    cf.detect_leaks = CAN_SANITIZE_LEAKS;
-    cf.external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
-    cf.malloc_context_size = kDefaultMallocContextSize;
-    cf.intercept_tls_get_addr = true;
-    OverrideCommonFlags(cf);
-  }
+  cf->detect_leaks = CAN_SANITIZE_LEAKS;
+  cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
+  cf->malloc_context_size = kDefaultMallocContextSize;
+  cf->intercept_tls_get_addr = true;
+  cf->coverage = false;
 
   internal_memset(f, 0, sizeof(*f));
   f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
@@ -260,17 +258,17 @@ void InitializeFlags(Flags *f) {
   }
 
   // Flag validation:
-  if (!CAN_SANITIZE_LEAKS && common_flags()->detect_leaks) {
+  if (!CAN_SANITIZE_LEAKS && cf->detect_leaks) {
     Report("%s: detect_leaks is not supported on this platform.\n",
            SanitizerToolName);
-    Die();
+    cf->detect_leaks = false;
   }
   // Make "strict_init_order" imply "check_initialization_order".
   // TODO(samsonov): Use a single runtime flag for an init-order checker.
   if (f->strict_init_order) {
     f->check_initialization_order = true;
   }
-  CHECK_LE((uptr)common_flags()->malloc_context_size, kStackTraceMax);
+  CHECK_LE((uptr)cf->malloc_context_size, kStackTraceMax);
   CHECK_LE(f->min_uar_stack_size_log, f->max_uar_stack_size_log);
   CHECK_GE(f->redzone, 16);
   CHECK_GE(f->max_redzone, f->redzone);
diff --git a/lib/lsan/lsan_common.cc b/lib/lsan/lsan_common.cc
index 3d4d8a6ab..89fef773b 100644
--- a/lib/lsan/lsan_common.cc
+++ b/lib/lsan/lsan_common.cc
@@ -74,13 +74,12 @@ static void InitializeFlags(bool standalone) {
 
   // Set defaults for common flags (only in standalone mode) and parse
   // them from LSAN_OPTIONS.
+  CommonFlags *cf = common_flags();
   if (standalone) {
     SetCommonFlagsDefaults();
-    CommonFlags cf = *common_flags();
-    cf.external_symbolizer_path = GetEnv("LSAN_SYMBOLIZER_PATH");
-    cf.malloc_context_size = 30;
-    cf.detect_leaks = true;
-    OverrideCommonFlags(cf);
+    cf->external_symbolizer_path = GetEnv("LSAN_SYMBOLIZER_PATH");
+    cf->malloc_context_size = 30;
+    cf->detect_leaks = true;
   }
   ParseCommonFlagsFromString(options);
 }
diff --git a/lib/msan/msan.cc b/lib/msan/msan.cc
index 4925619ec..546ffa719 100644
--- a/lib/msan/msan.cc
+++ b/lib/msan/msan.cc
@@ -144,17 +144,14 @@ static void ParseFlagsFromString(Flags *f, const char *str) {
 }
 
 static void InitializeFlags(Flags *f, const char *options) {
+  CommonFlags *cf = common_flags();
   SetCommonFlagsDefaults();
-  {
-    CommonFlags cf = *common_flags();
-    cf.external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
-    cf.malloc_context_size = 20;
-    cf.handle_ioctl = true;
-    // FIXME: test and enable.
-    cf.check_printf = false;
-    cf.intercept_tls_get_addr = true;
-    OverrideCommonFlags(cf);
-  }
+  cf->external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
+  cf->malloc_context_size = 20;
+  cf->handle_ioctl = true;
+  // FIXME: test and enable.
+  cf->check_printf = false;
+  cf->intercept_tls_get_addr = true;
 
   internal_memset(f, 0, sizeof(*f));
   f->poison_heap_with_zeroes = false;
diff --git a/lib/sanitizer_common/sanitizer_flags.h b/lib/sanitizer_common/sanitizer_flags.h
index 8718089ae..f71cf43b2 100644
--- a/lib/sanitizer_common/sanitizer_flags.h
+++ b/lib/sanitizer_common/sanitizer_flags.h
@@ -73,7 +73,7 @@ struct CommonFlags {
 
 // Functions to get/set global CommonFlags shared by all sanitizer runtimes:
 extern CommonFlags common_flags_dont_use;
-inline const CommonFlags *common_flags() {
+inline CommonFlags *common_flags() {
   return &common_flags_dont_use;
 }
 
@@ -84,16 +84,6 @@ inline void SetCommonFlagsDefaults() {
 inline void ParseCommonFlagsFromString(const char *str) {
   common_flags_dont_use.ParseFromString(str);
 }
-
-// This function can only be used to setup tool-specific overrides for
-// CommonFlags defaults. Generally, it should only be used right after
-// SetCommonFlagsDefaults(), but before ParseCommonFlagsFromString(), and
-// only during the flags initialization (i.e. before they are used for
-// the first time).
-inline void OverrideCommonFlags(const CommonFlags &cf) {
-  common_flags_dont_use = cf;
-}
-
 void PrintFlagDescriptions();
 
 }  // namespace __sanitizer
diff --git a/lib/tsan/dd/dd_rtl.cc b/lib/tsan/dd/dd_rtl.cc
index 3fd893dfb..cc8e5a0c4 100644
--- a/lib/tsan/dd/dd_rtl.cc
+++ b/lib/tsan/dd/dd_rtl.cc
@@ -70,13 +70,10 @@ void InitializeFlags(Flags *f, const char *env) {
   // Default values.
   f->second_deadlock_stack = false;
 
+  CommonFlags *cf = common_flags();
   SetCommonFlagsDefaults();
-  {
-    // Override some common flags defaults.
-    CommonFlags cf = *common_flags();
-    cf.allow_addr2line = true;
-    OverrideCommonFlags(cf);
-  }
+  // Override some common flags defaults.
+  cf->allow_addr2line = true;
 
   // Override from command line.
   ParseFlag(env, &f->second_deadlock_stack, "second_deadlock_stack", "");
diff --git a/lib/tsan/rtl/tsan_flags.cc b/lib/tsan/rtl/tsan_flags.cc
index 70fa1808a..ec74a24b0 100644
--- a/lib/tsan/rtl/tsan_flags.cc
+++ b/lib/tsan/rtl/tsan_flags.cc
@@ -93,16 +93,13 @@ void InitializeFlags(Flags *f, const char *env) {
   // DDFlags
   f->second_deadlock_stack = false;
 
+  CommonFlags *cf = common_flags();
   SetCommonFlagsDefaults();
-  {
-    // Override some common flags defaults.
-    CommonFlags cf = *common_flags();
-    cf.allow_addr2line = true;
-    cf.detect_deadlocks = true;
-    cf.print_suppressions = false;
-    cf.stack_trace_format = "    #%n %f %S %M";
-    OverrideCommonFlags(cf);
-  }
+  // Override some common flags defaults.
+  cf->allow_addr2line = true;
+  cf->detect_deadlocks = true;
+  cf->print_suppressions = false;
+  cf->stack_trace_format = "    #%n %f %S %M";
 
   // Let a frontend override.
   ParseFlags(f, __tsan_default_options());
@@ -118,8 +115,7 @@ void InitializeFlags(Flags *f, const char *env) {
     f->report_signal_unsafe = false;
   }
 
-  if (common_flags()->help)
-    PrintFlagDescriptions();
+  if (cf->help) PrintFlagDescriptions();
 
   if (f->history_size < 0 || f->history_size > 7) {
     Printf("ThreadSanitizer: incorrect value for history_size"
diff --git a/lib/ubsan/ubsan_flags.cc b/lib/ubsan/ubsan_flags.cc
index 61e703cde..db0e29bb2 100644
--- a/lib/ubsan/ubsan_flags.cc
+++ b/lib/ubsan/ubsan_flags.cc
@@ -22,10 +22,9 @@ static const char *MaybeCallUbsanDefaultOptions() {
 }
 
 void InitializeCommonFlags() {
+  CommonFlags *cf = common_flags();
   SetCommonFlagsDefaults();
-  CommonFlags cf = *common_flags();
-  cf.print_summary = false;
-  OverrideCommonFlags(cf);
+  cf->print_summary = false;
   // Override from user-specified string.
   ParseCommonFlagsFromString(MaybeCallUbsanDefaultOptions());
   // Override from environment variable.