1 // Copyright 2016 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/builtins/builtins.h"
6 #include "src/builtins/builtins-utils.h"
7
8 #include "src/code-factory.h"
9
10 namespace v8 {
11 namespace internal {
12
13 // ES7 sharedmem 6.3.4.1 get SharedArrayBuffer.prototype.byteLength
BUILTIN(SharedArrayBufferPrototypeGetByteLength)14 BUILTIN(SharedArrayBufferPrototypeGetByteLength) {
15 HandleScope scope(isolate);
16 CHECK_RECEIVER(JSArrayBuffer, array_buffer,
17 "get SharedArrayBuffer.prototype.byteLength");
18 if (!array_buffer->is_shared()) {
19 THROW_NEW_ERROR_RETURN_FAILURE(
20 isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
21 isolate->factory()->NewStringFromAsciiChecked(
22 "get SharedArrayBuffer.prototype.byteLength"),
23 args.receiver()));
24 }
25 return array_buffer->byte_length();
26 }
27
28 namespace {
29
ValidateSharedTypedArray(CodeStubAssembler * a,compiler::Node * tagged,compiler::Node * context,compiler::Node ** out_instance_type,compiler::Node ** out_backing_store)30 void ValidateSharedTypedArray(CodeStubAssembler* a, compiler::Node* tagged,
31 compiler::Node* context,
32 compiler::Node** out_instance_type,
33 compiler::Node** out_backing_store) {
34 using namespace compiler;
35 CodeStubAssembler::Label is_smi(a), not_smi(a), is_typed_array(a),
36 not_typed_array(a), is_shared(a), not_shared(a), is_float_or_clamped(a),
37 not_float_or_clamped(a), invalid(a);
38
39 // Fail if it is not a heap object.
40 a->Branch(a->TaggedIsSmi(tagged), &is_smi, ¬_smi);
41 a->Bind(&is_smi);
42 a->Goto(&invalid);
43
44 // Fail if the array's instance type is not JSTypedArray.
45 a->Bind(¬_smi);
46 a->Branch(a->WordEqual(a->LoadInstanceType(tagged),
47 a->Int32Constant(JS_TYPED_ARRAY_TYPE)),
48 &is_typed_array, ¬_typed_array);
49 a->Bind(¬_typed_array);
50 a->Goto(&invalid);
51
52 // Fail if the array's JSArrayBuffer is not shared.
53 a->Bind(&is_typed_array);
54 Node* array_buffer = a->LoadObjectField(tagged, JSTypedArray::kBufferOffset);
55 Node* is_buffer_shared =
56 a->IsSetWord32<JSArrayBuffer::IsShared>(a->LoadObjectField(
57 array_buffer, JSArrayBuffer::kBitFieldOffset, MachineType::Uint32()));
58 a->Branch(is_buffer_shared, &is_shared, ¬_shared);
59 a->Bind(¬_shared);
60 a->Goto(&invalid);
61
62 // Fail if the array's element type is float32, float64 or clamped.
63 a->Bind(&is_shared);
64 Node* elements_instance_type = a->LoadInstanceType(
65 a->LoadObjectField(tagged, JSObject::kElementsOffset));
66 STATIC_ASSERT(FIXED_INT8_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
67 STATIC_ASSERT(FIXED_INT16_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
68 STATIC_ASSERT(FIXED_INT32_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
69 STATIC_ASSERT(FIXED_UINT8_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
70 STATIC_ASSERT(FIXED_UINT16_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
71 STATIC_ASSERT(FIXED_UINT32_ARRAY_TYPE < FIXED_FLOAT32_ARRAY_TYPE);
72 a->Branch(a->Int32LessThan(elements_instance_type,
73 a->Int32Constant(FIXED_FLOAT32_ARRAY_TYPE)),
74 ¬_float_or_clamped, &is_float_or_clamped);
75 a->Bind(&is_float_or_clamped);
76 a->Goto(&invalid);
77
78 a->Bind(&invalid);
79 a->CallRuntime(Runtime::kThrowNotIntegerSharedTypedArrayError, context,
80 tagged);
81 a->Return(a->UndefinedConstant());
82
83 a->Bind(¬_float_or_clamped);
84 *out_instance_type = elements_instance_type;
85
86 Node* backing_store =
87 a->LoadObjectField(array_buffer, JSArrayBuffer::kBackingStoreOffset);
88 Node* byte_offset = a->ChangeUint32ToWord(a->TruncateTaggedToWord32(
89 context,
90 a->LoadObjectField(tagged, JSArrayBufferView::kByteOffsetOffset)));
91 *out_backing_store = a->IntPtrAdd(backing_store, byte_offset);
92 }
93
94 // https://tc39.github.io/ecmascript_sharedmem/shmem.html#Atomics.ValidateAtomicAccess
ConvertTaggedAtomicIndexToWord32(CodeStubAssembler * a,compiler::Node * tagged,compiler::Node * context)95 compiler::Node* ConvertTaggedAtomicIndexToWord32(CodeStubAssembler* a,
96 compiler::Node* tagged,
97 compiler::Node* context) {
98 using namespace compiler;
99 CodeStubAssembler::Variable var_result(a, MachineRepresentation::kWord32);
100
101 Callable to_number = CodeFactory::ToNumber(a->isolate());
102 Node* number_index = a->CallStub(to_number, context, tagged);
103 CodeStubAssembler::Label done(a, &var_result);
104
105 CodeStubAssembler::Label if_numberissmi(a), if_numberisnotsmi(a);
106 a->Branch(a->TaggedIsSmi(number_index), &if_numberissmi, &if_numberisnotsmi);
107
108 a->Bind(&if_numberissmi);
109 {
110 var_result.Bind(a->SmiToWord32(number_index));
111 a->Goto(&done);
112 }
113
114 a->Bind(&if_numberisnotsmi);
115 {
116 Node* number_index_value = a->LoadHeapNumberValue(number_index);
117 Node* access_index = a->TruncateFloat64ToWord32(number_index_value);
118 Node* test_index = a->ChangeInt32ToFloat64(access_index);
119
120 CodeStubAssembler::Label if_indexesareequal(a), if_indexesarenotequal(a);
121 a->Branch(a->Float64Equal(number_index_value, test_index),
122 &if_indexesareequal, &if_indexesarenotequal);
123
124 a->Bind(&if_indexesareequal);
125 {
126 var_result.Bind(access_index);
127 a->Goto(&done);
128 }
129
130 a->Bind(&if_indexesarenotequal);
131 a->Return(
132 a->CallRuntime(Runtime::kThrowInvalidAtomicAccessIndexError, context));
133 }
134
135 a->Bind(&done);
136 return var_result.value();
137 }
138
ValidateAtomicIndex(CodeStubAssembler * a,compiler::Node * index_word,compiler::Node * array_length_word,compiler::Node * context)139 void ValidateAtomicIndex(CodeStubAssembler* a, compiler::Node* index_word,
140 compiler::Node* array_length_word,
141 compiler::Node* context) {
142 using namespace compiler;
143 // Check if the index is in bounds. If not, throw RangeError.
144 CodeStubAssembler::Label if_inbounds(a), if_notinbounds(a);
145 // TODO(jkummerow): Use unsigned comparison instead of "i<0 || i>length".
146 a->Branch(
147 a->WordOr(a->Int32LessThan(index_word, a->Int32Constant(0)),
148 a->Int32GreaterThanOrEqual(index_word, array_length_word)),
149 &if_notinbounds, &if_inbounds);
150 a->Bind(&if_notinbounds);
151 a->Return(
152 a->CallRuntime(Runtime::kThrowInvalidAtomicAccessIndexError, context));
153 a->Bind(&if_inbounds);
154 }
155
156 } // anonymous namespace
157
Generate_AtomicsLoad(CodeStubAssembler * a)158 void Builtins::Generate_AtomicsLoad(CodeStubAssembler* a) {
159 using namespace compiler;
160 Node* array = a->Parameter(1);
161 Node* index = a->Parameter(2);
162 Node* context = a->Parameter(3 + 2);
163
164 Node* instance_type;
165 Node* backing_store;
166 ValidateSharedTypedArray(a, array, context, &instance_type, &backing_store);
167
168 Node* index_word32 = ConvertTaggedAtomicIndexToWord32(a, index, context);
169 Node* array_length_word32 = a->TruncateTaggedToWord32(
170 context, a->LoadObjectField(array, JSTypedArray::kLengthOffset));
171 ValidateAtomicIndex(a, index_word32, array_length_word32, context);
172 Node* index_word = a->ChangeUint32ToWord(index_word32);
173
174 CodeStubAssembler::Label i8(a), u8(a), i16(a), u16(a), i32(a), u32(a),
175 other(a);
176 int32_t case_values[] = {
177 FIXED_INT8_ARRAY_TYPE, FIXED_UINT8_ARRAY_TYPE, FIXED_INT16_ARRAY_TYPE,
178 FIXED_UINT16_ARRAY_TYPE, FIXED_INT32_ARRAY_TYPE, FIXED_UINT32_ARRAY_TYPE,
179 };
180 CodeStubAssembler::Label* case_labels[] = {
181 &i8, &u8, &i16, &u16, &i32, &u32,
182 };
183 a->Switch(instance_type, &other, case_values, case_labels,
184 arraysize(case_labels));
185
186 a->Bind(&i8);
187 a->Return(
188 a->SmiTag(a->AtomicLoad(MachineType::Int8(), backing_store, index_word)));
189
190 a->Bind(&u8);
191 a->Return(a->SmiTag(
192 a->AtomicLoad(MachineType::Uint8(), backing_store, index_word)));
193
194 a->Bind(&i16);
195 a->Return(a->SmiTag(a->AtomicLoad(MachineType::Int16(), backing_store,
196 a->WordShl(index_word, 1))));
197
198 a->Bind(&u16);
199 a->Return(a->SmiTag(a->AtomicLoad(MachineType::Uint16(), backing_store,
200 a->WordShl(index_word, 1))));
201
202 a->Bind(&i32);
203 a->Return(a->ChangeInt32ToTagged(a->AtomicLoad(
204 MachineType::Int32(), backing_store, a->WordShl(index_word, 2))));
205
206 a->Bind(&u32);
207 a->Return(a->ChangeUint32ToTagged(a->AtomicLoad(
208 MachineType::Uint32(), backing_store, a->WordShl(index_word, 2))));
209
210 // This shouldn't happen, we've already validated the type.
211 a->Bind(&other);
212 a->Return(a->Int32Constant(0));
213 }
214
Generate_AtomicsStore(CodeStubAssembler * a)215 void Builtins::Generate_AtomicsStore(CodeStubAssembler* a) {
216 using namespace compiler;
217 Node* array = a->Parameter(1);
218 Node* index = a->Parameter(2);
219 Node* value = a->Parameter(3);
220 Node* context = a->Parameter(4 + 2);
221
222 Node* instance_type;
223 Node* backing_store;
224 ValidateSharedTypedArray(a, array, context, &instance_type, &backing_store);
225
226 Node* index_word32 = ConvertTaggedAtomicIndexToWord32(a, index, context);
227 Node* array_length_word32 = a->TruncateTaggedToWord32(
228 context, a->LoadObjectField(array, JSTypedArray::kLengthOffset));
229 ValidateAtomicIndex(a, index_word32, array_length_word32, context);
230 Node* index_word = a->ChangeUint32ToWord(index_word32);
231
232 Node* value_integer = a->ToInteger(context, value);
233 Node* value_word32 = a->TruncateTaggedToWord32(context, value_integer);
234
235 CodeStubAssembler::Label u8(a), u16(a), u32(a), other(a);
236 int32_t case_values[] = {
237 FIXED_INT8_ARRAY_TYPE, FIXED_UINT8_ARRAY_TYPE, FIXED_INT16_ARRAY_TYPE,
238 FIXED_UINT16_ARRAY_TYPE, FIXED_INT32_ARRAY_TYPE, FIXED_UINT32_ARRAY_TYPE,
239 };
240 CodeStubAssembler::Label* case_labels[] = {
241 &u8, &u8, &u16, &u16, &u32, &u32,
242 };
243 a->Switch(instance_type, &other, case_values, case_labels,
244 arraysize(case_labels));
245
246 a->Bind(&u8);
247 a->AtomicStore(MachineRepresentation::kWord8, backing_store, index_word,
248 value_word32);
249 a->Return(value_integer);
250
251 a->Bind(&u16);
252 a->AtomicStore(MachineRepresentation::kWord16, backing_store,
253 a->WordShl(index_word, 1), value_word32);
254 a->Return(value_integer);
255
256 a->Bind(&u32);
257 a->AtomicStore(MachineRepresentation::kWord32, backing_store,
258 a->WordShl(index_word, 2), value_word32);
259 a->Return(value_integer);
260
261 // This shouldn't happen, we've already validated the type.
262 a->Bind(&other);
263 a->Return(a->Int32Constant(0));
264 }
265
266 } // namespace internal
267 } // namespace v8
268