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| 1 // Copyright 2015 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/compiler/fast-accessor-assembler.h" | |
| 6 | |
| 7 #include "src/base/logging.h" | |
| 8 #include "src/compiler/graph.h" | |
| 9 #include "src/compiler/linkage.h" | |
| 10 #include "src/compiler/pipeline.h" | |
| 11 #include "src/compiler/raw-machine-assembler.h" | |
| 12 #include "src/compiler/schedule.h" | |
| 13 #include "src/compiler/verifier.h" | |
| 14 #include "src/handles-inl.h" | |
| 15 #include "src/objects.h" // For FAA::GetInternalField impl. | |
| 16 | |
| 17 namespace v8 { | |
| 18 namespace internal { | |
| 19 namespace compiler { | |
| 20 | |
| 21 FastAccessorAssembler::FastAccessorAssembler(Isolate* isolate) | |
| 22 : zone_(), | |
| 23 assembler_(new RawMachineAssembler( | |
| 24 isolate, new (zone()) Graph(zone()), | |
| 25 Linkage::GetJSCallDescriptor(&zone_, false, 1, | |
| 26 CallDescriptor::kNoFlags))), | |
| 27 state_(kBuilding) {} | |
| 28 | |
| 29 | |
| 30 FastAccessorAssembler::~FastAccessorAssembler() {} | |
| 31 | |
| 32 | |
| 33 FastAccessorAssembler::ValueId FastAccessorAssembler::IntegerConstant( | |
| 34 int const_value) { | |
| 35 CHECK_EQ(kBuilding, state_); | |
| 36 return FromRaw(assembler_->NumberConstant(const_value)); | |
| 37 } | |
| 38 | |
| 39 | |
| 40 FastAccessorAssembler::ValueId FastAccessorAssembler::GetReceiver() { | |
| 41 CHECK_EQ(kBuilding, state_); | |
| 42 | |
| 43 // For JS call descriptor, the receiver is parameter 0. If we use other | |
| 44 // call descriptors, this may or may not hold. So let's check. | |
| 45 CHECK(assembler_->call_descriptor()->IsJSFunctionCall()); | |
| 46 return FromRaw(assembler_->Parameter(0)); | |
| 47 } | |
| 48 | |
| 49 | |
| 50 FastAccessorAssembler::ValueId FastAccessorAssembler::LoadInternalField( | |
| 51 ValueId value, int field_no) { | |
| 52 CHECK_EQ(kBuilding, state_); | |
| 53 // Determine the 'value' object's instance type. | |
| 54 Node* object_map = | |
| 55 assembler_->Load(kMachPtr, FromId(value), | |
| 56 assembler_->IntPtrConstant( | |
| 57 Internals::kHeapObjectMapOffset - kHeapObjectTag)); | |
| 58 Node* instance_type = assembler_->WordAnd( | |
| 59 assembler_->Load( | |
| 60 kMachUint16, object_map, | |
| 61 assembler_->IntPtrConstant( | |
| 62 Internals::kMapInstanceTypeAndBitFieldOffset - kHeapObjectTag)), | |
| 63 assembler_->IntPtrConstant(0xff)); | |
| 64 | |
| 65 // Check whether we have a proper JSObject. | |
| 66 RawMachineLabel is_jsobject, is_not_jsobject, merge; | |
| 67 assembler_->Branch( | |
| 68 assembler_->WordEqual( | |
| 69 instance_type, assembler_->IntPtrConstant(Internals::kJSObjectType)), | |
| 70 &is_jsobject, &is_not_jsobject); | |
| 71 | |
| 72 // JSObject? Then load the internal field field_no. | |
| 73 assembler_->Bind(&is_jsobject); | |
| 74 Node* internal_field = assembler_->Load( | |
| 75 kMachPtr, FromId(value), | |
| 76 assembler_->IntPtrConstant(JSObject::kHeaderSize - kHeapObjectTag + | |
| 77 kPointerSize * field_no)); | |
| 78 assembler_->Goto(&merge); | |
| 79 | |
| 80 // No JSObject? Return undefined. | |
| 81 // TODO(vogelheim): Check whether this is the appropriate action, or whether | |
| 82 // the method should take a label instead. | |
| 83 assembler_->Bind(&is_not_jsobject); | |
| 84 Node* fail_value = assembler_->UndefinedConstant(); | |
| 85 assembler_->Goto(&merge); | |
| 86 | |
| 87 // Return. | |
| 88 assembler_->Bind(&merge); | |
| 89 Node* phi = assembler_->Phi(kMachAnyTagged, internal_field, fail_value); | |
| 90 return FromRaw(phi); | |
| 91 } | |
| 92 | |
| 93 | |
| 94 FastAccessorAssembler::ValueId FastAccessorAssembler::LoadValue(ValueId value, | |
| 95 int offset) { | |
| 96 CHECK_EQ(kBuilding, state_); | |
| 97 return FromRaw(assembler_->Load(kMachIntPtr, FromId(value), | |
| 98 assembler_->IntPtrConstant(offset))); | |
| 99 } | |
| 100 | |
| 101 | |
| 102 FastAccessorAssembler::ValueId FastAccessorAssembler::LoadObject(ValueId value, | |
| 103 int offset) { | |
| 104 CHECK_EQ(kBuilding, state_); | |
| 105 return FromRaw(assembler_->Load( | |
| 106 kMachAnyTagged, assembler_->Load(kMachPtr, FromId(value), | |
| 107 assembler_->IntPtrConstant(offset)))); | |
| 108 } | |
| 109 | |
| 110 | |
| 111 void FastAccessorAssembler::ReturnValue(ValueId value) { | |
| 112 CHECK_EQ(kBuilding, state_); | |
| 113 assembler_->Return(FromId(value)); | |
| 114 } | |
| 115 | |
| 116 | |
| 117 void FastAccessorAssembler::CheckFlagSetOrReturnNull(ValueId value, int mask) { | |
| 118 CHECK_EQ(kBuilding, state_); | |
| 119 RawMachineLabel pass, fail; | |
| 120 assembler_->Branch( | |
| 121 assembler_->Word32Equal( | |
| 122 assembler_->Word32And(FromId(value), assembler_->Int32Constant(mask)), | |
| 123 assembler_->Int32Constant(0)), | |
| 124 &pass, &fail); | |
| 125 assembler_->Bind(&fail); | |
| 126 assembler_->Return(assembler_->NullConstant()); | |
| 127 assembler_->Bind(&pass); | |
| 128 } | |
| 129 | |
| 130 | |
| 131 void FastAccessorAssembler::CheckNotZeroOrReturnNull(ValueId value) { | |
| 132 CHECK_EQ(kBuilding, state_); | |
| 133 RawMachineLabel is_null, not_null; | |
| 134 assembler_->Branch( | |
| 135 assembler_->IntPtrEqual(FromId(value), assembler_->IntPtrConstant(0)), | |
| 136 &is_null, ¬_null); | |
| 137 assembler_->Bind(&is_null); | |
| 138 assembler_->Return(assembler_->NullConstant()); | |
| 139 assembler_->Bind(¬_null); | |
| 140 } | |
| 141 | |
| 142 | |
| 143 FastAccessorAssembler::LabelId FastAccessorAssembler::MakeLabel() { | |
| 144 CHECK_EQ(kBuilding, state_); | |
| 145 RawMachineLabel* label = | |
| 146 new (zone()->New(sizeof(RawMachineLabel))) RawMachineLabel; | |
| 147 return FromRaw(label); | |
| 148 } | |
| 149 | |
| 150 | |
| 151 void FastAccessorAssembler::SetLabel(LabelId label_id) { | |
| 152 CHECK_EQ(kBuilding, state_); | |
| 153 assembler_->Bind(FromId(label_id)); | |
| 154 } | |
| 155 | |
| 156 | |
| 157 void FastAccessorAssembler::CheckNotZeroOrJump(ValueId value_id, | |
| 158 LabelId label_id) { | |
| 159 CHECK_EQ(kBuilding, state_); | |
| 160 RawMachineLabel pass; | |
| 161 assembler_->Branch( | |
| 162 assembler_->IntPtrEqual(FromId(value_id), assembler_->IntPtrConstant(0)), | |
| 163 &pass, FromId(label_id)); | |
| 164 assembler_->Bind(&pass); | |
| 165 } | |
| 166 | |
| 167 | |
| 168 MaybeHandle<Code> FastAccessorAssembler::Build() { | |
| 169 CHECK_EQ(kBuilding, state_); | |
| 170 | |
| 171 // Cleanup: We no longer need this. | |
| 172 nodes_.clear(); | |
| 173 labels_.clear(); | |
| 174 | |
| 175 // Export the schedule and call the compiler. | |
| 176 CompilationInfo info("FastAccessorAssembler", assembler_->isolate(), zone()); | |
| 177 Schedule* schedule = assembler_->Export(); | |
| 178 | |
| 179 // TODO(vogelheim): Pipeline should have a dedicated entry point for this | |
| 180 // assembler. | |
| 181 MaybeHandle<Code> code = Pipeline::GenerateCodeForTesting( | |
| 182 &info, assembler_->call_descriptor(), assembler_->graph(), schedule); | |
| 183 | |
| 184 // Update state & return. | |
| 185 state_ = !code.is_null() ? kBuilt : kError; | |
| 186 return code; | |
| 187 } | |
| 188 | |
| 189 | |
| 190 FastAccessorAssembler::ValueId FastAccessorAssembler::FromRaw(Node* node) { | |
| 191 nodes_.push_back(node); | |
| 192 ValueId value = {nodes_.size() - 1}; | |
| 193 return value; | |
| 194 } | |
| 195 | |
| 196 | |
| 197 FastAccessorAssembler::LabelId FastAccessorAssembler::FromRaw( | |
| 198 RawMachineLabel* label) { | |
| 199 labels_.push_back(label); | |
| 200 LabelId label_id = {labels_.size() - 1}; | |
| 201 return label_id; | |
| 202 } | |
| 203 | |
| 204 | |
| 205 Node* FastAccessorAssembler::FromId(ValueId value) const { | |
| 206 CHECK_LT(value.value_id, nodes_.size()); | |
| 207 CHECK_NOT_NULL(nodes_.at(value.value_id)); | |
| 208 return nodes_.at(value.value_id); | |
| 209 } | |
| 210 | |
| 211 | |
| 212 RawMachineLabel* FastAccessorAssembler::FromId(LabelId label) const { | |
| 213 CHECK_LT(label.label_id, labels_.size()); | |
| 214 CHECK_NOT_NULL(labels_.at(label.label_id)); | |
| 215 return labels_.at(label.label_id); | |
| 216 } | |
| 217 | |
| 218 | |
| 219 } // namespace compiler | |
| 220 } // namespace internal | |
| 221 } // namespace v8 | |
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Chromium Code Reviews
Issue 1513203002:
Revert of Implement Fast Accessor Builder (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master