Revert of [Atomics] code stubs for atomic operations

src/builtins.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/builtins.h"
 
 #include "src/api.h"
 #include "src/api-arguments.h"
 #include "src/api-natives.h"
 #include "src/base/once.h"
@@ skipping 5127 matching lines @@
 
 void Builtins::Generate_InterruptCheck(MacroAssembler* masm) {
   masm->TailCallRuntime(Runtime::kInterrupt);
 }
 
 
 void Builtins::Generate_StackCheck(MacroAssembler* masm) {
   masm->TailCallRuntime(Runtime::kStackGuard);
 }
 
-namespace {
-
-void ValidateSharedTypedArray(compiler::CodeStubAssembler* a,
-                              compiler::Node* tagged, compiler::Node* context) {
-  using namespace compiler;
-  CodeStubAssembler::Label is_smi(a), not_smi(a), is_typed_array(a),
-      not_typed_array(a), is_shared(a), not_shared(a), is_float_or_clamped(a),
-      not_float_or_clamped(a), invalid(a);
-
-  // Fail if it is not a heap object.
-  a->Branch(a->WordIsSmi(tagged), &is_smi, &not_smi);
-  a->Bind(&is_smi);
-  a->Goto(&invalid);
-
-  // Fail if the array's instance type is not JSTypedArray.
-  a->Bind(&not_smi);
-  a->Branch(a->WordEqual(a->LoadInstanceType(tagged),
-                         a->Int32Constant(JS_TYPED_ARRAY_TYPE)),
-            &is_typed_array, &not_typed_array);
-  a->Bind(&not_typed_array);
-  a->Goto(&invalid);
-
-  // Fail if the array's JSArrayBuffer is not shared.
-  a->Bind(&is_typed_array);
-  Node* is_buffer_shared =
-      a->BitFieldDecode<JSArrayBuffer::IsShared>(a->LoadObjectField(
-          a->LoadObjectField(tagged, JSTypedArray::kBufferOffset),
-          JSArrayBuffer::kBitFieldOffset));
-  a->Branch(is_buffer_shared, &is_shared, &not_shared);
-  a->Bind(&not_shared);
-  a->Goto(&invalid);
-
-  // Fail if the array's element type is float32, float64 or clamped.
-  a->Bind(&is_shared);
-  Node* elements_instance_type = a->LoadInstanceType(
-      a->LoadObjectField(tagged, JSObject::kElementsOffset));
-  STATIC_ASSERT(FIXED_INT8_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
-  STATIC_ASSERT(FIXED_INT16_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
-  STATIC_ASSERT(FIXED_INT32_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
-  STATIC_ASSERT(FIXED_UINT8_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
-  STATIC_ASSERT(FIXED_UINT16_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
-  STATIC_ASSERT(FIXED_UINT32_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
-  a->Branch(a->Int32LessThan(elements_instance_type,
-                             a->Int32Constant(FIXED_FLOAT32_ARRAY_TYPE)),
-            &not_float_or_clamped, &is_float_or_clamped);
-  a->Bind(&is_float_or_clamped);
-  a->Goto(&invalid);
-
-  a->Bind(&invalid);
-  a->CallRuntime(Runtime::kThrowNotIntegerSharedTypedArrayError, context,
-                 tagged);
-  a->Return(a->UndefinedConstant());
-
-  a->Bind(&not_float_or_clamped);
-}
-
-// https://tc39.github.io/ecmascript_sharedmem/shmem.html#Atomics.ValidateAtomicAccess
-compiler::Node* ConvertTaggedAtomicIndexToWord32(compiler::CodeStubAssembler* a,
-                                                 compiler::Node* tagged,
-                                                 compiler::Node* context) {
-  using namespace compiler;
-  CodeStubAssembler::Variable var_result(a, MachineRepresentation::kWord32);
-
-  Callable to_number = CodeFactory::ToNumber(a->isolate());
-  Node* number_index = a->CallStub(to_number, context, tagged);
-  CodeStubAssembler::Label done(a, &var_result);
-
-  CodeStubAssembler::Label if_numberissmi(a), if_numberisnotsmi(a);
-  a->Branch(a->WordIsSmi(number_index), &if_numberissmi, &if_numberisnotsmi);
-
-  a->Bind(&if_numberissmi);
-  {
-    var_result.Bind(a->SmiToWord32(number_index));
-    a->Goto(&done);
-  }
-
-  a->Bind(&if_numberisnotsmi);
-  {
-    Node* number_index_value = a->LoadHeapNumberValue(number_index);
-    Node* access_index = a->TruncateFloat64ToInt32(number_index_value);
-    Node* test_index = a->ChangeInt32ToFloat64(access_index);
-
-    CodeStubAssembler::Label if_indexesareequal(a), if_indexesarenotequal(a);
-    a->Branch(a->Float64Equal(number_index_value, test_index),
-              &if_indexesareequal, &if_indexesarenotequal);
-
-    a->Bind(&if_indexesareequal);
-    {
-      var_result.Bind(access_index);
-      a->Goto(&done);
-    }
-
-    a->Bind(&if_indexesarenotequal);
-    a->Return(
-        a->CallRuntime(Runtime::kThrowInvalidAtomicAccessIndexError, context));
-  }
-
-  a->Bind(&done);
-  return var_result.value();
-}
-
-void ValidateAtomicIndex(compiler::CodeStubAssembler* a,
-                         compiler::Node* index_word,
-                         compiler::Node* array_length_word,
-                         compiler::Node* context) {
-  using namespace compiler;
-  // Check if the index is in bounds. If not, throw RangeError.
-  CodeStubAssembler::Label if_inbounds(a), if_notinbounds(a);
-  a->Branch(
-      a->WordOr(a->Int32LessThan(index_word, a->Int32Constant(0)),
-                a->Int32GreaterThanOrEqual(index_word, array_length_word)),
-      &if_notinbounds, &if_inbounds);
-  a->Bind(&if_notinbounds);
-  a->Return(
-      a->CallRuntime(Runtime::kThrowInvalidAtomicAccessIndexError, context));
-  a->Bind(&if_inbounds);
-}
-
-}  // anonymous namespace
-
-void Builtins::Generate_AtomicsLoadCheck(compiler::CodeStubAssembler* a) {
-  using namespace compiler;
-  Isolate* isolate = a->isolate();
-  Node* array = a->Parameter(1);
-  Node* index = a->Parameter(2);
-  Node* context = a->Parameter(3 + 2);
-  ValidateSharedTypedArray(a, array, context);
-  Node* index_word = ConvertTaggedAtomicIndexToWord32(a, index, context);
-  Node* array_length_word = a->TruncateTaggedToWord32(
-      context, a->LoadObjectField(array, JSTypedArray::kLengthOffset));
-  ValidateAtomicIndex(a, index_word, array_length_word, context);
-
-  Callable atomics_load = CodeFactory::AtomicsLoad(isolate);
-  Node* target = a->HeapConstant(atomics_load.code());
-  a->Return(a->CallStub(atomics_load.descriptor(), target, context, array,
-                        index_word));
-}
 
 #define DEFINE_BUILTIN_ACCESSOR_C(name, ignore)               \
 Handle<Code> Builtins::name() {                               \
   Code** code_address =                                       \
       reinterpret_cast<Code**>(builtin_address(k##name));     \
   return Handle<Code>(code_address);                          \
 }
 #define DEFINE_BUILTIN_ACCESSOR_A(name, kind, state, extra) \
 Handle<Code> Builtins::name() {                             \
   Code** code_address =                                     \
@@ skipping 16 matching lines @@
 BUILTIN_LIST_T(DEFINE_BUILTIN_ACCESSOR_T)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 #undef DEFINE_BUILTIN_ACCESSOR_T
 #undef DEFINE_BUILTIN_ACCESSOR_H
 
 }  // namespace internal
 }  // namespace v8