| // Copyright 2017 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/builtins-utils-gen.h" |
| #include "src/builtins/builtins.h" |
| #include "src/codegen/code-stub-assembler.h" |
| #include "src/objects/objects.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| using compiler::Node; |
| |
| class SharedArrayBufferBuiltinsAssembler : public CodeStubAssembler { |
| public: |
| explicit SharedArrayBufferBuiltinsAssembler( |
| compiler::CodeAssemblerState* state) |
| : CodeStubAssembler(state) {} |
| |
| protected: |
| using AssemblerFunction = |
| Node* (CodeAssembler::*)(MachineType type, TNode<RawPtrT> base, |
| TNode<UintPtrT> offset, Node* value, |
| base::Optional<TNode<UintPtrT>> value_high); |
| TNode<JSArrayBuffer> ValidateIntegerTypedArray( |
| TNode<Object> maybe_array, TNode<Context> context, |
| TNode<Int32T>* out_elements_kind, TNode<RawPtrT>* out_backing_store, |
| Label* detached); |
| |
| TNode<UintPtrT> ValidateAtomicAccess(TNode<JSTypedArray> array, |
| TNode<Object> index, |
| TNode<Context> context); |
| |
| inline void DebugCheckAtomicIndex(TNode<JSTypedArray> array, |
| TNode<UintPtrT> index); |
| |
| void AtomicBinopBuiltinCommon(TNode<Object> maybe_array, TNode<Object> index, |
| TNode<Object> value, TNode<Context> context, |
| AssemblerFunction function, |
| Runtime::FunctionId runtime_function, |
| const char* method_name); |
| |
| // Create a BigInt from the result of a 64-bit atomic operation, using |
| // projections on 32-bit platforms. |
| TNode<BigInt> BigIntFromSigned64(Node* signed64); |
| TNode<BigInt> BigIntFromUnsigned64(Node* unsigned64); |
| }; |
| |
| // https://tc39.es/ecma262/#sec-validateintegertypedarray |
| TNode<JSArrayBuffer> |
| SharedArrayBufferBuiltinsAssembler::ValidateIntegerTypedArray( |
| TNode<Object> maybe_array, TNode<Context> context, |
| TNode<Int32T>* out_elements_kind, TNode<RawPtrT>* out_backing_store, |
| Label* detached) { |
| Label not_float_or_clamped(this), invalid(this); |
| |
| // The logic of TypedArrayBuiltinsAssembler::ValidateTypedArrayBuffer is |
| // inlined to avoid duplicate error branches. |
| |
| // Fail if it is not a heap object. |
| GotoIf(TaggedIsSmi(maybe_array), &invalid); |
| |
| // Fail if the array's instance type is not JSTypedArray. |
| TNode<Map> map = LoadMap(CAST(maybe_array)); |
| GotoIfNot(IsJSTypedArrayMap(map), &invalid); |
| TNode<JSTypedArray> array = CAST(maybe_array); |
| |
| // Fail if the array's JSArrayBuffer is detached. |
| TNode<JSArrayBuffer> array_buffer = GetTypedArrayBuffer(context, array); |
| GotoIf(IsDetachedBuffer(array_buffer), detached); |
| |
| // Fail if the array's element type is float32, float64 or clamped. |
| STATIC_ASSERT(INT8_ELEMENTS < FLOAT32_ELEMENTS); |
| STATIC_ASSERT(INT16_ELEMENTS < FLOAT32_ELEMENTS); |
| STATIC_ASSERT(INT32_ELEMENTS < FLOAT32_ELEMENTS); |
| STATIC_ASSERT(UINT8_ELEMENTS < FLOAT32_ELEMENTS); |
| STATIC_ASSERT(UINT16_ELEMENTS < FLOAT32_ELEMENTS); |
| STATIC_ASSERT(UINT32_ELEMENTS < FLOAT32_ELEMENTS); |
| TNode<Int32T> elements_kind = LoadMapElementsKind(map); |
| GotoIf(Int32LessThan(elements_kind, Int32Constant(FLOAT32_ELEMENTS)), |
| ¬_float_or_clamped); |
| STATIC_ASSERT(BIGINT64_ELEMENTS > UINT8_CLAMPED_ELEMENTS); |
| STATIC_ASSERT(BIGUINT64_ELEMENTS > UINT8_CLAMPED_ELEMENTS); |
| Branch(Int32GreaterThan(elements_kind, Int32Constant(UINT8_CLAMPED_ELEMENTS)), |
| ¬_float_or_clamped, &invalid); |
| |
| BIND(&invalid); |
| { |
| ThrowTypeError(context, MessageTemplate::kNotIntegerTypedArray, |
| maybe_array); |
| } |
| |
| BIND(¬_float_or_clamped); |
| *out_elements_kind = elements_kind; |
| |
| TNode<RawPtrT> backing_store = LoadJSArrayBufferBackingStorePtr(array_buffer); |
| TNode<UintPtrT> byte_offset = LoadJSArrayBufferViewByteOffset(array); |
| *out_backing_store = RawPtrAdd(backing_store, Signed(byte_offset)); |
| |
| return array_buffer; |
| } |
| |
| // https://tc39.github.io/ecma262/#sec-validateatomicaccess |
| // ValidateAtomicAccess( typedArray, requestIndex ) |
| TNode<UintPtrT> SharedArrayBufferBuiltinsAssembler::ValidateAtomicAccess( |
| TNode<JSTypedArray> array, TNode<Object> index, TNode<Context> context) { |
| Label done(this), range_error(this); |
| |
| // 1. Assert: typedArray is an Object that has a [[ViewedArrayBuffer]] |
| // internal slot. |
| // 2. Let length be typedArray.[[ArrayLength]]. |
| TNode<UintPtrT> array_length = LoadJSTypedArrayLength(array); |
| |
| // 3. Let accessIndex be ? ToIndex(requestIndex). |
| TNode<UintPtrT> index_uintptr = ToIndex(context, index, &range_error); |
| |
| // 4. Assert: accessIndex ≥ 0. |
| // 5. If accessIndex ≥ length, throw a RangeError exception. |
| Branch(UintPtrLessThan(index_uintptr, array_length), &done, &range_error); |
| |
| BIND(&range_error); |
| ThrowRangeError(context, MessageTemplate::kInvalidAtomicAccessIndex); |
| |
| // 6. Return accessIndex. |
| BIND(&done); |
| return index_uintptr; |
| } |
| |
| void SharedArrayBufferBuiltinsAssembler::DebugCheckAtomicIndex( |
| TNode<JSTypedArray> array, TNode<UintPtrT> index) { |
| // In Debug mode, we re-validate the index as a sanity check because ToInteger |
| // above calls out to JavaScript. Atomics work on ArrayBuffers, which may be |
| // detached, and detachment state must be checked and throw before this |
| // check. The length cannot change. |
| // |
| // This function must always be called after ValidateIntegerTypedArray, which |
| // will ensure that LoadJSArrayBufferViewBuffer will not be null. |
| CSA_ASSERT(this, Word32BinaryNot( |
| IsDetachedBuffer(LoadJSArrayBufferViewBuffer(array)))); |
| CSA_ASSERT(this, UintPtrLessThan(index, LoadJSTypedArrayLength(array))); |
| } |
| |
| TNode<BigInt> SharedArrayBufferBuiltinsAssembler::BigIntFromSigned64( |
| Node* signed64) { |
| if (Is64()) { |
| return BigIntFromInt64(UncheckedCast<IntPtrT>(signed64)); |
| } else { |
| TNode<IntPtrT> low = UncheckedCast<IntPtrT>(Projection(0, signed64)); |
| TNode<IntPtrT> high = UncheckedCast<IntPtrT>(Projection(1, signed64)); |
| return BigIntFromInt32Pair(low, high); |
| } |
| } |
| |
| TNode<BigInt> SharedArrayBufferBuiltinsAssembler::BigIntFromUnsigned64( |
| Node* unsigned64) { |
| if (Is64()) { |
| return BigIntFromUint64(UncheckedCast<UintPtrT>(unsigned64)); |
| } else { |
| TNode<UintPtrT> low = UncheckedCast<UintPtrT>(Projection(0, unsigned64)); |
| TNode<UintPtrT> high = UncheckedCast<UintPtrT>(Projection(1, unsigned64)); |
| return BigIntFromUint32Pair(low, high); |
| } |
| } |
| |
| // https://tc39.es/ecma262/#sec-atomicload |
| TF_BUILTIN(AtomicsLoad, SharedArrayBufferBuiltinsAssembler) { |
| auto maybe_array = Parameter<Object>(Descriptor::kArray); |
| auto index = Parameter<Object>(Descriptor::kIndex); |
| auto context = Parameter<Context>(Descriptor::kContext); |
| |
| // 1. Let buffer be ? ValidateIntegerTypedArray(typedArray). |
| Label detached(this); |
| TNode<Int32T> elements_kind; |
| TNode<RawPtrT> backing_store; |
| TNode<JSArrayBuffer> array_buffer = ValidateIntegerTypedArray( |
| maybe_array, context, &elements_kind, &backing_store, &detached); |
| TNode<JSTypedArray> array = CAST(maybe_array); |
| |
| // 2. Let i be ? ValidateAtomicAccess(typedArray, index). |
| TNode<UintPtrT> index_word = ValidateAtomicAccess(array, index, context); |
| |
| // 3. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| // 4. NOTE: The above check is not redundant with the check in |
| // ValidateIntegerTypedArray because the call to ValidateAtomicAccess on the |
| // preceding line can have arbitrary side effects, which could cause the |
| // buffer to become detached. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| // Steps 5-10. |
| // |
| // (Not copied from ecma262 due to the axiomatic nature of the memory model.) |
| Label i8(this), u8(this), i16(this), u16(this), i32(this), u32(this), |
| i64(this), u64(this), other(this); |
| int32_t case_values[] = { |
| INT8_ELEMENTS, UINT8_ELEMENTS, INT16_ELEMENTS, UINT16_ELEMENTS, |
| INT32_ELEMENTS, UINT32_ELEMENTS, BIGINT64_ELEMENTS, BIGUINT64_ELEMENTS, |
| }; |
| Label* case_labels[] = {&i8, &u8, &i16, &u16, &i32, &u32, &i64, &u64}; |
| Switch(elements_kind, &other, case_values, case_labels, |
| arraysize(case_labels)); |
| |
| BIND(&i8); |
| Return( |
| SmiFromInt32(AtomicLoad(MachineType::Int8(), backing_store, index_word))); |
| |
| BIND(&u8); |
| Return(SmiFromInt32( |
| AtomicLoad(MachineType::Uint8(), backing_store, index_word))); |
| |
| BIND(&i16); |
| Return(SmiFromInt32( |
| AtomicLoad(MachineType::Int16(), backing_store, WordShl(index_word, 1)))); |
| |
| BIND(&u16); |
| Return(SmiFromInt32(AtomicLoad(MachineType::Uint16(), backing_store, |
| WordShl(index_word, 1)))); |
| |
| BIND(&i32); |
| Return(ChangeInt32ToTagged( |
| AtomicLoad(MachineType::Int32(), backing_store, WordShl(index_word, 2)))); |
| |
| BIND(&u32); |
| Return(ChangeUint32ToTagged(AtomicLoad(MachineType::Uint32(), backing_store, |
| WordShl(index_word, 2)))); |
| #if V8_TARGET_ARCH_MIPS && !_MIPS_ARCH_MIPS32R6 |
| BIND(&i64); |
| Goto(&u64); |
| |
| BIND(&u64); |
| { |
| TNode<Number> index_number = ChangeUintPtrToTagged(index_word); |
| Return(CallRuntime(Runtime::kAtomicsLoad64, context, array, index_number)); |
| } |
| #else |
| BIND(&i64); |
| // This uses Uint64() intentionally: AtomicLoad is not implemented for |
| // Int64(), which is fine because the machine instruction only cares |
| // about words. |
| Return(BigIntFromSigned64(AtomicLoad(MachineType::Uint64(), backing_store, |
| WordShl(index_word, 3)))); |
| |
| BIND(&u64); |
| Return(BigIntFromUnsigned64(AtomicLoad(MachineType::Uint64(), backing_store, |
| WordShl(index_word, 3)))); |
| #endif |
| |
| // This shouldn't happen, we've already validated the type. |
| BIND(&other); |
| Unreachable(); |
| |
| BIND(&detached); |
| { |
| ThrowTypeError(context, MessageTemplate::kDetachedOperation, |
| "Atomics.load"); |
| } |
| } |
| |
| // https://tc39.es/ecma262/#sec-atomics.store |
| TF_BUILTIN(AtomicsStore, SharedArrayBufferBuiltinsAssembler) { |
| auto maybe_array = Parameter<Object>(Descriptor::kArray); |
| auto index = Parameter<Object>(Descriptor::kIndex); |
| auto value = Parameter<Object>(Descriptor::kValue); |
| auto context = Parameter<Context>(Descriptor::kContext); |
| |
| // 1. Let buffer be ? ValidateIntegerTypedArray(typedArray). |
| Label detached(this); |
| TNode<Int32T> elements_kind; |
| TNode<RawPtrT> backing_store; |
| TNode<JSArrayBuffer> array_buffer = ValidateIntegerTypedArray( |
| maybe_array, context, &elements_kind, &backing_store, &detached); |
| TNode<JSTypedArray> array = CAST(maybe_array); |
| |
| // 2. Let i be ? ValidateAtomicAccess(typedArray, index). |
| TNode<UintPtrT> index_word = ValidateAtomicAccess(array, index, context); |
| |
| Label u8(this), u16(this), u32(this), u64(this), other(this); |
| |
| // 3. Let arrayTypeName be typedArray.[[TypedArrayName]]. |
| // 4. If arrayTypeName is "BigUint64Array" or "BigInt64Array", |
| // let v be ? ToBigInt(value). |
| STATIC_ASSERT(BIGINT64_ELEMENTS > INT32_ELEMENTS); |
| STATIC_ASSERT(BIGUINT64_ELEMENTS > INT32_ELEMENTS); |
| GotoIf(Int32GreaterThan(elements_kind, Int32Constant(INT32_ELEMENTS)), &u64); |
| |
| // 5. Otherwise, let v be ? ToInteger(value). |
| TNode<Number> value_integer = ToInteger_Inline(context, value); |
| |
| // 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| // 7. NOTE: The above check is not redundant with the check in |
| // ValidateIntegerTypedArray because the call to ToBigInt or ToInteger on the |
| // preceding lines can have arbitrary side effects, which could cause the |
| // buffer to become detached. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| TNode<Word32T> value_word32 = TruncateTaggedToWord32(context, value_integer); |
| |
| DebugCheckAtomicIndex(array, index_word); |
| |
| // Steps 8-13. |
| // |
| // (Not copied from ecma262 due to the axiomatic nature of the memory model.) |
| int32_t case_values[] = { |
| INT8_ELEMENTS, UINT8_ELEMENTS, INT16_ELEMENTS, |
| UINT16_ELEMENTS, INT32_ELEMENTS, UINT32_ELEMENTS, |
| }; |
| Label* case_labels[] = {&u8, &u8, &u16, &u16, &u32, &u32}; |
| Switch(elements_kind, &other, case_values, case_labels, |
| arraysize(case_labels)); |
| |
| BIND(&u8); |
| AtomicStore(MachineRepresentation::kWord8, backing_store, index_word, |
| value_word32); |
| Return(value_integer); |
| |
| BIND(&u16); |
| AtomicStore(MachineRepresentation::kWord16, backing_store, |
| WordShl(index_word, 1), value_word32); |
| Return(value_integer); |
| |
| BIND(&u32); |
| AtomicStore(MachineRepresentation::kWord32, backing_store, |
| WordShl(index_word, 2), value_word32); |
| Return(value_integer); |
| |
| BIND(&u64); |
| #if V8_TARGET_ARCH_MIPS && !_MIPS_ARCH_MIPS32R6 |
| TNode<Number> index_number = ChangeUintPtrToTagged(index_word); |
| Return(CallRuntime(Runtime::kAtomicsStore64, context, array, index_number, |
| value)); |
| #else |
| // 4. If arrayTypeName is "BigUint64Array" or "BigInt64Array", |
| // let v be ? ToBigInt(value). |
| TNode<BigInt> value_bigint = ToBigInt(context, value); |
| |
| // 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| DebugCheckAtomicIndex(array, index_word); |
| |
| TVARIABLE(UintPtrT, var_low); |
| TVARIABLE(UintPtrT, var_high); |
| BigIntToRawBytes(value_bigint, &var_low, &var_high); |
| TNode<UintPtrT> high = Is64() ? TNode<UintPtrT>() : var_high.value(); |
| AtomicStore(MachineRepresentation::kWord64, backing_store, |
| WordShl(index_word, 3), var_low.value(), high); |
| Return(value_bigint); |
| #endif |
| |
| // This shouldn't happen, we've already validated the type. |
| BIND(&other); |
| Unreachable(); |
| |
| BIND(&detached); |
| { |
| ThrowTypeError(context, MessageTemplate::kDetachedOperation, |
| "Atomics.store"); |
| } |
| } |
| |
| // https://tc39.es/ecma262/#sec-atomics.exchange |
| TF_BUILTIN(AtomicsExchange, SharedArrayBufferBuiltinsAssembler) { |
| auto maybe_array = Parameter<Object>(Descriptor::kArray); |
| auto index = Parameter<Object>(Descriptor::kIndex); |
| auto value = Parameter<Object>(Descriptor::kValue); |
| auto context = Parameter<Context>(Descriptor::kContext); |
| |
| // Inlines AtomicReadModifyWrite |
| // https://tc39.es/ecma262/#sec-atomicreadmodifywrite |
| |
| // 1. Let buffer be ? ValidateIntegerTypedArray(typedArray). |
| Label detached(this); |
| TNode<Int32T> elements_kind; |
| TNode<RawPtrT> backing_store; |
| TNode<JSArrayBuffer> array_buffer = ValidateIntegerTypedArray( |
| maybe_array, context, &elements_kind, &backing_store, &detached); |
| TNode<JSTypedArray> array = CAST(maybe_array); |
| |
| // 2. Let i be ? ValidateAtomicAccess(typedArray, index). |
| TNode<UintPtrT> index_word = ValidateAtomicAccess(array, index, context); |
| |
| #if V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 |
| USE(array_buffer); |
| TNode<Number> index_number = ChangeUintPtrToTagged(index_word); |
| Return(CallRuntime(Runtime::kAtomicsExchange, context, array, index_number, |
| value)); |
| #else |
| |
| Label i8(this), u8(this), i16(this), u16(this), i32(this), u32(this), |
| i64(this), u64(this), big(this), other(this); |
| |
| // 3. Let arrayTypeName be typedArray.[[TypedArrayName]]. |
| // 4. If typedArray.[[ContentType]] is BigInt, let v be ? ToBigInt(value). |
| STATIC_ASSERT(BIGINT64_ELEMENTS > INT32_ELEMENTS); |
| STATIC_ASSERT(BIGUINT64_ELEMENTS > INT32_ELEMENTS); |
| GotoIf(Int32GreaterThan(elements_kind, Int32Constant(INT32_ELEMENTS)), &big); |
| |
| // 5. Otherwise, let v be ? ToInteger(value). |
| TNode<Number> value_integer = ToInteger_Inline(context, value); |
| |
| // 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| // 7. NOTE: The above check is not redundant with the check in |
| // ValidateIntegerTypedArray because the call to ToBigInt or ToInteger on the |
| // preceding lines can have arbitrary side effects, which could cause the |
| // buffer to become detached. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| DebugCheckAtomicIndex(array, index_word); |
| |
| TNode<Word32T> value_word32 = TruncateTaggedToWord32(context, value_integer); |
| |
| // Steps 8-12. |
| // |
| // (Not copied from ecma262 due to the axiomatic nature of the memory model.) |
| int32_t case_values[] = { |
| INT8_ELEMENTS, UINT8_ELEMENTS, INT16_ELEMENTS, |
| UINT16_ELEMENTS, INT32_ELEMENTS, UINT32_ELEMENTS, |
| }; |
| Label* case_labels[] = { |
| &i8, &u8, &i16, &u16, &i32, &u32, |
| }; |
| Switch(elements_kind, &other, case_values, case_labels, |
| arraysize(case_labels)); |
| |
| BIND(&i8); |
| Return(SmiFromInt32(AtomicExchange(MachineType::Int8(), backing_store, |
| index_word, value_word32, base::nullopt))); |
| |
| BIND(&u8); |
| Return(SmiFromInt32(AtomicExchange(MachineType::Uint8(), backing_store, |
| index_word, value_word32, base::nullopt))); |
| |
| BIND(&i16); |
| Return(SmiFromInt32(AtomicExchange(MachineType::Int16(), backing_store, |
| WordShl(index_word, UintPtrConstant(1)), |
| value_word32, base::nullopt))); |
| |
| BIND(&u16); |
| Return(SmiFromInt32(AtomicExchange(MachineType::Uint16(), backing_store, |
| WordShl(index_word, UintPtrConstant(1)), |
| value_word32, base::nullopt))); |
| |
| BIND(&i32); |
| Return(ChangeInt32ToTagged(AtomicExchange( |
| MachineType::Int32(), backing_store, |
| WordShl(index_word, UintPtrConstant(2)), value_word32, base::nullopt))); |
| |
| BIND(&u32); |
| Return(ChangeUint32ToTagged(AtomicExchange( |
| MachineType::Uint32(), backing_store, |
| WordShl(index_word, UintPtrConstant(2)), value_word32, base::nullopt))); |
| |
| BIND(&big); |
| // 4. If typedArray.[[ContentType]] is BigInt, let v be ? ToBigInt(value). |
| TNode<BigInt> value_bigint = ToBigInt(context, value); |
| |
| // 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| DebugCheckAtomicIndex(array, index_word); |
| |
| TVARIABLE(UintPtrT, var_low); |
| TVARIABLE(UintPtrT, var_high); |
| BigIntToRawBytes(value_bigint, &var_low, &var_high); |
| TNode<UintPtrT> high = Is64() ? TNode<UintPtrT>() : var_high.value(); |
| GotoIf(Word32Equal(elements_kind, Int32Constant(BIGINT64_ELEMENTS)), &i64); |
| GotoIf(Word32Equal(elements_kind, Int32Constant(BIGUINT64_ELEMENTS)), &u64); |
| Unreachable(); |
| |
| BIND(&i64); |
| // This uses Uint64() intentionally: AtomicExchange is not implemented for |
| // Int64(), which is fine because the machine instruction only cares |
| // about words. |
| Return(BigIntFromSigned64(AtomicExchange( |
| MachineType::Uint64(), backing_store, |
| WordShl(index_word, UintPtrConstant(3)), var_low.value(), high))); |
| |
| BIND(&u64); |
| Return(BigIntFromUnsigned64(AtomicExchange( |
| MachineType::Uint64(), backing_store, |
| WordShl(index_word, UintPtrConstant(3)), var_low.value(), high))); |
| |
| // This shouldn't happen, we've already validated the type. |
| BIND(&other); |
| Unreachable(); |
| #endif // V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 |
| |
| BIND(&detached); |
| { |
| ThrowTypeError(context, MessageTemplate::kDetachedOperation, |
| "Atomics.exchange"); |
| } |
| } |
| |
| // https://tc39.es/ecma262/#sec-atomics.compareexchange |
| TF_BUILTIN(AtomicsCompareExchange, SharedArrayBufferBuiltinsAssembler) { |
| auto maybe_array = Parameter<Object>(Descriptor::kArray); |
| auto index = Parameter<Object>(Descriptor::kIndex); |
| auto old_value = Parameter<Object>(Descriptor::kOldValue); |
| auto new_value = Parameter<Object>(Descriptor::kNewValue); |
| auto context = Parameter<Context>(Descriptor::kContext); |
| |
| // 1. Let buffer be ? ValidateIntegerTypedArray(typedArray). |
| Label detached(this); |
| TNode<Int32T> elements_kind; |
| TNode<RawPtrT> backing_store; |
| TNode<JSArrayBuffer> array_buffer = ValidateIntegerTypedArray( |
| maybe_array, context, &elements_kind, &backing_store, &detached); |
| TNode<JSTypedArray> array = CAST(maybe_array); |
| |
| // 2. Let i be ? ValidateAtomicAccess(typedArray, index). |
| TNode<UintPtrT> index_word = ValidateAtomicAccess(array, index, context); |
| |
| #if V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 || V8_TARGET_ARCH_PPC64 || \ |
| V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_S390 || V8_TARGET_ARCH_S390X |
| USE(array_buffer); |
| TNode<Number> index_number = ChangeUintPtrToTagged(index_word); |
| Return(CallRuntime(Runtime::kAtomicsCompareExchange, context, array, |
| index_number, old_value, new_value)); |
| #else |
| Label i8(this), u8(this), i16(this), u16(this), i32(this), u32(this), |
| i64(this), u64(this), big(this), other(this); |
| |
| // 3. Let arrayTypeName be typedArray.[[TypedArrayName]]. |
| // 4. If typedArray.[[ContentType]] is BigInt, then |
| // a. Let expected be ? ToBigInt(expectedValue). |
| // b. Let replacement be ? ToBigInt(replacementValue). |
| STATIC_ASSERT(BIGINT64_ELEMENTS > INT32_ELEMENTS); |
| STATIC_ASSERT(BIGUINT64_ELEMENTS > INT32_ELEMENTS); |
| GotoIf(Int32GreaterThan(elements_kind, Int32Constant(INT32_ELEMENTS)), &big); |
| |
| // 5. Else, |
| // a. Let expected be ? ToInteger(expectedValue). |
| // b. Let replacement be ? ToInteger(replacementValue). |
| TNode<Number> old_value_integer = ToInteger_Inline(context, old_value); |
| TNode<Number> new_value_integer = ToInteger_Inline(context, new_value); |
| |
| // 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| // 7. NOTE: The above check is not redundant with the check in |
| // ValidateIntegerTypedArray because the call to ToBigInt or ToInteger on the |
| // preceding lines can have arbitrary side effects, which could cause the |
| // buffer to become detached. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| DebugCheckAtomicIndex(array, index_word); |
| |
| TNode<Word32T> old_value_word32 = |
| TruncateTaggedToWord32(context, old_value_integer); |
| TNode<Word32T> new_value_word32 = |
| TruncateTaggedToWord32(context, new_value_integer); |
| |
| // Steps 8-14. |
| // |
| // (Not copied from ecma262 due to the axiomatic nature of the memory model.) |
| int32_t case_values[] = { |
| INT8_ELEMENTS, UINT8_ELEMENTS, INT16_ELEMENTS, |
| UINT16_ELEMENTS, INT32_ELEMENTS, UINT32_ELEMENTS, |
| }; |
| Label* case_labels[] = { |
| &i8, &u8, &i16, &u16, &i32, &u32, |
| }; |
| Switch(elements_kind, &other, case_values, case_labels, |
| arraysize(case_labels)); |
| |
| BIND(&i8); |
| Return(SmiFromInt32(AtomicCompareExchange(MachineType::Int8(), backing_store, |
| index_word, old_value_word32, |
| new_value_word32))); |
| |
| BIND(&u8); |
| Return(SmiFromInt32(AtomicCompareExchange(MachineType::Uint8(), backing_store, |
| index_word, old_value_word32, |
| new_value_word32))); |
| |
| BIND(&i16); |
| Return(SmiFromInt32(AtomicCompareExchange( |
| MachineType::Int16(), backing_store, WordShl(index_word, 1), |
| old_value_word32, new_value_word32))); |
| |
| BIND(&u16); |
| Return(SmiFromInt32(AtomicCompareExchange( |
| MachineType::Uint16(), backing_store, WordShl(index_word, 1), |
| old_value_word32, new_value_word32))); |
| |
| BIND(&i32); |
| Return(ChangeInt32ToTagged(AtomicCompareExchange( |
| MachineType::Int32(), backing_store, WordShl(index_word, 2), |
| old_value_word32, new_value_word32))); |
| |
| BIND(&u32); |
| Return(ChangeUint32ToTagged(AtomicCompareExchange( |
| MachineType::Uint32(), backing_store, WordShl(index_word, 2), |
| old_value_word32, new_value_word32))); |
| |
| BIND(&big); |
| // 4. If typedArray.[[ContentType]] is BigInt, then |
| // a. Let expected be ? ToBigInt(expectedValue). |
| // b. Let replacement be ? ToBigInt(replacementValue). |
| TNode<BigInt> old_value_bigint = ToBigInt(context, old_value); |
| TNode<BigInt> new_value_bigint = ToBigInt(context, new_value); |
| |
| // 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| DebugCheckAtomicIndex(array, index_word); |
| |
| TVARIABLE(UintPtrT, var_old_low); |
| TVARIABLE(UintPtrT, var_old_high); |
| TVARIABLE(UintPtrT, var_new_low); |
| TVARIABLE(UintPtrT, var_new_high); |
| BigIntToRawBytes(old_value_bigint, &var_old_low, &var_old_high); |
| BigIntToRawBytes(new_value_bigint, &var_new_low, &var_new_high); |
| TNode<UintPtrT> old_high = Is64() ? TNode<UintPtrT>() : var_old_high.value(); |
| TNode<UintPtrT> new_high = Is64() ? TNode<UintPtrT>() : var_new_high.value(); |
| GotoIf(Word32Equal(elements_kind, Int32Constant(BIGINT64_ELEMENTS)), &i64); |
| GotoIf(Word32Equal(elements_kind, Int32Constant(BIGUINT64_ELEMENTS)), &u64); |
| Unreachable(); |
| |
| BIND(&i64); |
| // This uses Uint64() intentionally: AtomicCompareExchange is not implemented |
| // for Int64(), which is fine because the machine instruction only cares |
| // about words. |
| Return(BigIntFromSigned64(AtomicCompareExchange( |
| MachineType::Uint64(), backing_store, WordShl(index_word, 3), |
| var_old_low.value(), var_new_low.value(), old_high, new_high))); |
| |
| BIND(&u64); |
| Return(BigIntFromUnsigned64(AtomicCompareExchange( |
| MachineType::Uint64(), backing_store, WordShl(index_word, 3), |
| var_old_low.value(), var_new_low.value(), old_high, new_high))); |
| |
| // This shouldn't happen, we've already validated the type. |
| BIND(&other); |
| Unreachable(); |
| #endif // V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 || V8_TARGET_ARCH_PPC64 |
| // || V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_S390 || V8_TARGET_ARCH_S390X |
| |
| BIND(&detached); |
| { |
| ThrowTypeError(context, MessageTemplate::kDetachedOperation, |
| "Atomics.store"); |
| } |
| } |
| |
| #define BINOP_BUILTIN(op, method_name) \ |
| TF_BUILTIN(Atomics##op, SharedArrayBufferBuiltinsAssembler) { \ |
| auto array = Parameter<Object>(Descriptor::kArray); \ |
| auto index = Parameter<Object>(Descriptor::kIndex); \ |
| auto value = Parameter<Object>(Descriptor::kValue); \ |
| auto context = Parameter<Context>(Descriptor::kContext); \ |
| AtomicBinopBuiltinCommon(array, index, value, context, \ |
| &CodeAssembler::Atomic##op, \ |
| Runtime::kAtomics##op, method_name); \ |
| } |
| // https://tc39.es/ecma262/#sec-atomics.add |
| BINOP_BUILTIN(Add, "Atomics.add") |
| // https://tc39.es/ecma262/#sec-atomics.sub |
| BINOP_BUILTIN(Sub, "Atomics.sub") |
| // https://tc39.es/ecma262/#sec-atomics.and |
| BINOP_BUILTIN(And, "Atomics.and") |
| // https://tc39.es/ecma262/#sec-atomics.or |
| BINOP_BUILTIN(Or, "Atomics.or") |
| // https://tc39.es/ecma262/#sec-atomics.xor |
| BINOP_BUILTIN(Xor, "Atomics.xor") |
| #undef BINOP_BUILTIN |
| |
| // https://tc39.es/ecma262/#sec-atomicreadmodifywrite |
| void SharedArrayBufferBuiltinsAssembler::AtomicBinopBuiltinCommon( |
| TNode<Object> maybe_array, TNode<Object> index, TNode<Object> value, |
| TNode<Context> context, AssemblerFunction function, |
| Runtime::FunctionId runtime_function, const char* method_name) { |
| // 1. Let buffer be ? ValidateIntegerTypedArray(typedArray). |
| Label detached(this); |
| TNode<Int32T> elements_kind; |
| TNode<RawPtrT> backing_store; |
| TNode<JSArrayBuffer> array_buffer = ValidateIntegerTypedArray( |
| maybe_array, context, &elements_kind, &backing_store, &detached); |
| TNode<JSTypedArray> array = CAST(maybe_array); |
| |
| // 2. Let i be ? ValidateAtomicAccess(typedArray, index). |
| TNode<UintPtrT> index_word = ValidateAtomicAccess(array, index, context); |
| |
| #if V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 || V8_TARGET_ARCH_PPC64 || \ |
| V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_S390 || V8_TARGET_ARCH_S390X |
| USE(array_buffer); |
| TNode<Number> index_number = ChangeUintPtrToTagged(index_word); |
| Return(CallRuntime(runtime_function, context, array, index_number, value)); |
| #else |
| Label i8(this), u8(this), i16(this), u16(this), i32(this), u32(this), |
| i64(this), u64(this), big(this), other(this); |
| |
| // 3. Let arrayTypeName be typedArray.[[TypedArrayName]]. |
| // 4. If typedArray.[[ContentType]] is BigInt, let v be ? ToBigInt(value). |
| STATIC_ASSERT(BIGINT64_ELEMENTS > INT32_ELEMENTS); |
| STATIC_ASSERT(BIGUINT64_ELEMENTS > INT32_ELEMENTS); |
| GotoIf(Int32GreaterThan(elements_kind, Int32Constant(INT32_ELEMENTS)), &big); |
| |
| // 5. Otherwise, let v be ? ToInteger(value). |
| TNode<Number> value_integer = ToInteger_Inline(context, value); |
| |
| // 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| // 7. NOTE: The above check is not redundant with the check in |
| // ValidateIntegerTypedArray because the call to ToBigInt or ToInteger on the |
| // preceding lines can have arbitrary side effects, which could cause the |
| // buffer to become detached. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| DebugCheckAtomicIndex(array, index_word); |
| |
| TNode<Word32T> value_word32 = TruncateTaggedToWord32(context, value_integer); |
| |
| // Steps 8-12. |
| // |
| // (Not copied from ecma262 due to the axiomatic nature of the memory model.) |
| int32_t case_values[] = { |
| INT8_ELEMENTS, UINT8_ELEMENTS, INT16_ELEMENTS, |
| UINT16_ELEMENTS, INT32_ELEMENTS, UINT32_ELEMENTS, |
| }; |
| Label* case_labels[] = { |
| &i8, &u8, &i16, &u16, &i32, &u32, |
| }; |
| Switch(elements_kind, &other, case_values, case_labels, |
| arraysize(case_labels)); |
| |
| BIND(&i8); |
| Return( |
| SmiFromInt32((this->*function)(MachineType::Int8(), backing_store, |
| index_word, value_word32, base::nullopt))); |
| BIND(&u8); |
| Return( |
| SmiFromInt32((this->*function)(MachineType::Uint8(), backing_store, |
| index_word, value_word32, base::nullopt))); |
| BIND(&i16); |
| Return(SmiFromInt32((this->*function)(MachineType::Int16(), backing_store, |
| WordShl(index_word, UintPtrConstant(1)), |
| value_word32, base::nullopt))); |
| BIND(&u16); |
| Return(SmiFromInt32((this->*function)(MachineType::Uint16(), backing_store, |
| WordShl(index_word, UintPtrConstant(1)), |
| value_word32, base::nullopt))); |
| BIND(&i32); |
| Return(ChangeInt32ToTagged((this->*function)( |
| MachineType::Int32(), backing_store, |
| WordShl(index_word, UintPtrConstant(2)), value_word32, base::nullopt))); |
| BIND(&u32); |
| Return(ChangeUint32ToTagged((this->*function)( |
| MachineType::Uint32(), backing_store, |
| WordShl(index_word, UintPtrConstant(2)), value_word32, base::nullopt))); |
| BIND(&big); |
| // 4. If typedArray.[[ContentType]] is BigInt, let v be ? ToBigInt(value). |
| TNode<BigInt> value_bigint = ToBigInt(context, value); |
| |
| // 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception. |
| GotoIf(IsDetachedBuffer(array_buffer), &detached); |
| |
| DebugCheckAtomicIndex(array, index_word); |
| |
| TVARIABLE(UintPtrT, var_low); |
| TVARIABLE(UintPtrT, var_high); |
| BigIntToRawBytes(value_bigint, &var_low, &var_high); |
| TNode<UintPtrT> high = Is64() ? TNode<UintPtrT>() : var_high.value(); |
| GotoIf(Word32Equal(elements_kind, Int32Constant(BIGINT64_ELEMENTS)), &i64); |
| GotoIf(Word32Equal(elements_kind, Int32Constant(BIGUINT64_ELEMENTS)), &u64); |
| Unreachable(); |
| |
| BIND(&i64); |
| // This uses Uint64() intentionally: Atomic* ops are not implemented for |
| // Int64(), which is fine because the machine instructions only care |
| // about words. |
| Return(BigIntFromSigned64((this->*function)( |
| MachineType::Uint64(), backing_store, |
| WordShl(index_word, UintPtrConstant(3)), var_low.value(), high))); |
| BIND(&u64); |
| Return(BigIntFromUnsigned64((this->*function)( |
| MachineType::Uint64(), backing_store, |
| WordShl(index_word, UintPtrConstant(3)), var_low.value(), high))); |
| // This shouldn't happen, we've already validated the type. |
| BIND(&other); |
| Unreachable(); |
| #endif // V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 || V8_TARGET_ARCH_PPC64 |
| // || V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_S390 || V8_TARGET_ARCH_S390X |
| |
| BIND(&detached); |
| ThrowTypeError(context, MessageTemplate::kDetachedOperation, method_name); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |
