tsan: remove TSAN_SHADOW_COUNT

TSAN_SHADOW_COUNT is defined to 4 in all environments.
Other values of TSAN_SHADOW_COUNT were never tested and
were broken by recent changes to shadow mapping.
Remove it as there is no reason to fix nor maintain it.

llvm-svn: 226466

compiler-rt/lib/tsan/go/build.bat

@@ -1,4 +1,4 @@
 type tsan_go.cc ..\rtl\tsan_interface_atomic.cc ..\rtl\tsan_clock.cc ..\rtl\tsan_flags.cc ..\rtl\tsan_md5.cc ..\rtl\tsan_mutex.cc ..\rtl\tsan_report.cc ..\rtl\tsan_rtl.cc ..\rtl\tsan_rtl_mutex.cc ..\rtl\tsan_rtl_report.cc ..\rtl\tsan_rtl_thread.cc ..\rtl\tsan_stat.cc ..\rtl\tsan_suppressions.cc ..\rtl\tsan_sync.cc ..\rtl\tsan_stack_trace.cc ..\..\sanitizer_common\sanitizer_allocator.cc ..\..\sanitizer_common\sanitizer_common.cc ..\..\sanitizer_common\sanitizer_flags.cc ..\..\sanitizer_common\sanitizer_stacktrace.cc ..\..\sanitizer_common\sanitizer_libc.cc ..\..\sanitizer_common\sanitizer_printf.cc ..\..\sanitizer_common\sanitizer_suppressions.cc ..\..\sanitizer_common\sanitizer_thread_registry.cc ..\rtl\tsan_platform_windows.cc ..\..\sanitizer_common\sanitizer_win.cc ..\..\sanitizer_common\sanitizer_deadlock_detector1.cc ..\..\sanitizer_common\sanitizer_stackdepot.cc ..\..\sanitizer_common\sanitizer_persistent_allocator.cc > gotsan.cc
 
-gcc -c -o race_windows_amd64.syso gotsan.cc -I..\rtl -I..\.. -I..\..\sanitizer_common -I..\..\..\include -m64 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO -DTSAN_SHADOW_COUNT=4 -Wno-error=attributes -Wno-attributes -Wno-format -DSANITIZER_DEBUG=0 -O3 -fomit-frame-pointer
+gcc -c -o race_windows_amd64.syso gotsan.cc -I..\rtl -I..\.. -I..\..\sanitizer_common -I..\..\..\include -m64 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO -Wno-error=attributes -Wno-attributes -Wno-format -DSANITIZER_DEBUG=0 -O3 -fomit-frame-pointer
 

compiler-rt/lib/tsan/go/buildgo.sh

@@ -87,7 +87,7 @@ for F in $SRCS; do
 	cat $F >> gotsan.cc
 done
 
-FLAGS=" -I../rtl -I../.. -I../../sanitizer_common -I../../../include -std=c++11 -m64 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO -DTSAN_SHADOW_COUNT=4 -DSANITIZER_DEADLOCK_DETECTOR_VERSION=2 $OSCFLAGS"
+FLAGS=" -I../rtl -I../.. -I../../sanitizer_common -I../../../include -std=c++11 -m64 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO -DSANITIZER_DEADLOCK_DETECTOR_VERSION=2 $OSCFLAGS"
 if [ "$DEBUG" == "" ]; then
 	FLAGS+=" -DSANITIZER_DEBUG=0 -O3 -msse3 -fomit-frame-pointer"
 else

compiler-rt/lib/tsan/rtl/tsan_defs.h

@@ -40,18 +40,8 @@ const int kClkBits = 42;
 const unsigned kMaxTidReuse = (1 << (64 - kClkBits)) - 1;
 const uptr kShadowStackSize = 64 * 1024;
 
-#ifdef TSAN_SHADOW_COUNT
-# if TSAN_SHADOW_COUNT == 2 \
-  || TSAN_SHADOW_COUNT == 4 || TSAN_SHADOW_COUNT == 8
-const uptr kShadowCnt = TSAN_SHADOW_COUNT;
-# else
-#   error "TSAN_SHADOW_COUNT must be one of 2,4,8"
-# endif
-#else
 // Count of shadow values in a shadow cell.
-#define TSAN_SHADOW_COUNT 4
 const uptr kShadowCnt = 4;
-#endif
 
 // That many user bytes are mapped onto a single shadow cell.
 const uptr kShadowCell = 8;
@@ -96,16 +86,6 @@ void build_consistency_stats();
 void build_consistency_nostats();
 #endif
 
-#if TSAN_SHADOW_COUNT == 1
-void build_consistency_shadow1();
-#elif TSAN_SHADOW_COUNT == 2
-void build_consistency_shadow2();
-#elif TSAN_SHADOW_COUNT == 4
-void build_consistency_shadow4();
-#else
-void build_consistency_shadow8();
-#endif
-
 static inline void USED build_consistency() {
 #if SANITIZER_DEBUG
   build_consistency_debug();
@@ -117,15 +97,6 @@ static inline void USED build_consistency() {
 #else
   build_consistency_nostats();
 #endif
-#if TSAN_SHADOW_COUNT == 1
-  build_consistency_shadow1();
-#elif TSAN_SHADOW_COUNT == 2
-  build_consistency_shadow2();
-#elif TSAN_SHADOW_COUNT == 4
-  build_consistency_shadow4();
-#else
-  build_consistency_shadow8();
-#endif
 }
 
 template<typename T>

compiler-rt/lib/tsan/rtl/tsan_rtl.cc

@@ -565,15 +565,7 @@ void MemoryAccessImpl1(ThreadState *thr, uptr addr,
   // it's just not worth it (performance- and complexity-wise).
 
   Shadow old(0);
-  if (kShadowCnt == 1) {
+
-    int idx = 0;
-#include "tsan_update_shadow_word_inl.h"
-  } else if (kShadowCnt == 2) {
-    int idx = 0;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 1;
-#include "tsan_update_shadow_word_inl.h"
-  } else if (kShadowCnt == 4) {
   int idx = 0;
 #include "tsan_update_shadow_word_inl.h"
   idx = 1;
@@ -582,26 +574,6 @@ void MemoryAccessImpl1(ThreadState *thr, uptr addr,
 #include "tsan_update_shadow_word_inl.h"
   idx = 3;
 #include "tsan_update_shadow_word_inl.h"
-  } else if (kShadowCnt == 8) {
-    int idx = 0;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 1;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 2;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 3;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 4;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 5;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 6;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 7;
-#include "tsan_update_shadow_word_inl.h"
-  } else {
-    CHECK(false);
-  }
 
   // we did not find any races and had already stored
   // the current access info, so we are done
@@ -652,7 +624,7 @@ bool ContainsSameAccessSlow(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
   return false;
 }
 
-#if defined(__SSE3__) && TSAN_SHADOW_COUNT == 4
+#if defined(__SSE3__)
 #define SHUF(v0, v1, i0, i1, i2, i3) _mm_castps_si128(_mm_shuffle_ps( \
     _mm_castsi128_ps(v0), _mm_castsi128_ps(v1), \
     (i0)*1 + (i1)*4 + (i2)*16 + (i3)*64))
@@ -712,7 +684,7 @@ bool ContainsSameAccessFast(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
 
 ALWAYS_INLINE
 bool ContainsSameAccess(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
-#if defined(__SSE3__) && TSAN_SHADOW_COUNT == 4
+#if defined(__SSE3__)
   bool res = ContainsSameAccessFast(s, a, sync_epoch, is_write);
   // NOTE: this check can fail if the shadow is concurrently mutated
   // by other threads. But it still can be useful if you modify
@@ -1003,16 +975,6 @@ void build_consistency_stats() {}
 void build_consistency_nostats() {}
 #endif
 
-#if TSAN_SHADOW_COUNT == 1
-void build_consistency_shadow1() {}
-#elif TSAN_SHADOW_COUNT == 2
-void build_consistency_shadow2() {}
-#elif TSAN_SHADOW_COUNT == 4
-void build_consistency_shadow4() {}
-#else
-void build_consistency_shadow8() {}
-#endif
-
 }  // namespace __tsan
 
 #ifndef SANITIZER_GO

compiler-rt/lib/tsan/tests/rtl/tsan_string.cc

@@ -46,9 +46,6 @@ TEST(ThreadSanitizer, MemcpyRace1) {
   t2.Memcpy(data, data2, 10, true);
 }
 
-// The test fails with TSAN_SHADOW_COUNT=2,
-// because the old racy access is evicted.
-#if defined(TSAN_SHADOW_COUNT) && TSAN_SHADOW_COUNT >= 4
 TEST(ThreadSanitizer, MemcpyRace2) {
   char *data = new char[10];
   char *data1 = new char[10];
@@ -57,7 +54,6 @@ TEST(ThreadSanitizer, MemcpyRace2) {
   t1.Memcpy(data+5, data1, 1);
   t2.Memcpy(data+3, data2, 4, true);
 }
-#endif
 
 TEST(ThreadSanitizer, MemcpyRace3) {
   char *data = new char[10];