Revert "[codegen] Add TSAN support for tagged stores in generated code"

This reverts commit 2c096b53.

Reason for revert: speculative revert for https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20no-concurrent-marking/3838/overview

Original change's description:
> [codegen] Add TSAN support for tagged stores in generated code
>
> Mimics the kArchStoreWithWriteBarrier store in generated code by having
> a relaxed store to the same address, with the same value. This is done
> in order for TSAN to see these stores from generated code.
>
> Since it is done only for kArchStoreWithWriteBarrier TSAN will see
> tagged stores only.
>
> Bug: v8:7790, v8:11600
>
> Change-Id: I275dd46f5556b3a095c416adc03f2f0ac5bde41c
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2848470
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Reviewed-by: Georg Neis <neis@chromium.org>
> Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#74568}

Bug: v8:7790
Bug: v8:11600
Change-Id: Ib0c7917af2b4ba43b81a8afebd687324cd78b228
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2902930
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74627}

BUILD.gn

@@ -601,7 +601,6 @@ external_v8_defines = [
   "V8_NO_ARGUMENTS_ADAPTOR",
   "V8_USE_PERFETTO",
   "V8_MAP_PACKING",
-  "V8_IS_TSAN",
 ]
 
 enabled_external_v8_defines = []
@@ -638,9 +637,6 @@ if (v8_use_perfetto) {
 if (v8_enable_map_packing) {
   enabled_external_v8_defines += [ "V8_MAP_PACKING" ]
 }
-if (is_tsan) {
-  enabled_external_v8_defines += [ "V8_IS_TSAN" ]
-}
 
 disabled_external_v8_defines = external_v8_defines - enabled_external_v8_defines
 

src/base/macros.h

@@ -420,13 +420,4 @@ bool is_inbounds(float_t v) {
 #define IF_WASM(V, ...)
 #endif  // V8_ENABLE_WEBASSEMBLY
 
-// Defines IF_TSAN, to be used in macro lists for elements that should only be
-// there if TSAN is enabled.
-#ifdef V8_IS_TSAN
-// EXPAND is needed to work around MSVC's broken __VA_ARGS__ expansion.
-#define IF_TSAN(V, ...) EXPAND(V(__VA_ARGS__))
-#else
-#define IF_TSAN(V, ...)
-#endif  // V8_ENABLE_WEBASSEMBLY
-
 #endif  // V8_BASE_MACROS_H_

src/codegen/external-reference.cc

@@ -1153,28 +1153,6 @@ static uint64_t atomic_pair_compare_exchange(intptr_t address,
 FUNCTION_REFERENCE(atomic_pair_compare_exchange_function,
                    atomic_pair_compare_exchange)
 
-#ifdef V8_IS_TSAN
-// Mimics the store in generated code (generated by kArchStoreWithWriteBarrier)
-// by having a relaxed store to the same address, with the same value. This is
-// done in order for TSAN to see these stores from generated code.
-// TODO(solanes): Also do this for non-kArchStoreWithWriteBarrier stores.
-static void tsan_relaxed_store(Address addr, int64_t value) {
-#if V8_TARGET_ARCH_X64
-  if (COMPRESS_POINTERS_BOOL) {
-    base::Relaxed_Store(reinterpret_cast<base::Atomic32*>(addr),
-                        static_cast<base::Atomic32>(value));
-  } else {
-    base::Relaxed_Store(reinterpret_cast<base::Atomic64*>(addr),
-                        static_cast<base::Atomic64>(value));
-  }
-#else
-  UNREACHABLE();
-#endif  // V8_TARGET_ARCH_X64
-}
-#endif  // V8_IS_TSAN
-
-IF_TSAN(FUNCTION_REFERENCE, tsan_relaxed_store_function, tsan_relaxed_store)
-
 static int EnterMicrotaskContextWrapper(HandleScopeImplementer* hsi,
                                         Address raw_context) {
   Context context = Context::cast(Object(raw_context));

src/codegen/external-reference.h

@@ -265,7 +265,6 @@ class StatsCounter;
   V(atomic_pair_exchange_function, "atomic_pair_exchange_function")            \
   V(atomic_pair_compare_exchange_function,                                     \
     "atomic_pair_compare_exchange_function")                                   \
-  IF_TSAN(V, tsan_relaxed_store_function, "tsan_relaxed_store_function")       \
   V(js_finalization_registry_remove_cell_from_unregister_token_map,            \
     "JSFinalizationRegistry::RemoveCellFromUnregisterTokenMap")                \
   V(re_match_for_call_from_js, "IrregexpInterpreter::MatchForCallFromJs")      \

src/compiler/backend/x64/code-generator-x64.cc

@@ -320,36 +320,6 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
   Zone* zone_;
 };
 
-#ifdef V8_IS_TSAN
-class OutOfLineTSANWrite final : public OutOfLineCode {
- public:
-  OutOfLineTSANWrite(CodeGenerator* gen, Operand operand, Register value)
-      : OutOfLineCode(gen),
-        operand_(operand),
-        value_(value),
-        zone_(gen->zone()) {}
-
-  void Generate() final {
-    const SaveFPRegsMode save_fp_mode = frame()->DidAllocateDoubleRegisters()
-                                            ? SaveFPRegsMode::kSave
-                                            : SaveFPRegsMode::kIgnore;
-    const int number_of_args = 2;
-    __ PushCallerSaved(save_fp_mode);
-    __ PrepareCallCFunction(number_of_args);
-    __ leaq(arg_reg_1, operand_);
-    __ movq(arg_reg_2, value_);
-    __ CallCFunction(ExternalReference::tsan_relaxed_store_function(),
-                     number_of_args);
-    __ PopCallerSaved(save_fp_mode);
-  }
-
- private:
-  Operand const operand_;
-  Register const value_;
-  Zone* zone_;
-};
-#endif  // V8_IS_TSAN
-
 #if V8_ENABLE_WEBASSEMBLY
 class WasmOutOfLineTrap : public OutOfLineCode {
  public:
@@ -1214,13 +1184,6 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       size_t index = 0;
       Operand operand = i.MemoryOperand(&index);
       Register value = i.InputRegister(index);
-
-#ifdef V8_IS_TSAN
-      auto tsan_ool = zone()->New<OutOfLineTSANWrite>(this, operand, value);
-      __ jmp(tsan_ool->entry());
-      __ bind(tsan_ool->exit());
-#endif  // V8_IS_TSAN
-
       Register scratch0 = i.TempRegister(0);
       Register scratch1 = i.TempRegister(1);
       auto ool = zone()->New<OutOfLineRecordWrite>(this, object, operand, value,