Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2014 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 | #ifndef V8_COMPILER_REPRESENTATION_CHANGE_H_ |
| 6 | #define V8_COMPILER_REPRESENTATION_CHANGE_H_ |
| 7 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 8 | #include "src/compiler/js-graph.h" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 9 | #include "src/compiler/simplified-operator.h" |
| 10 | |
| 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | namespace compiler { |
| 14 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 15 | class Truncation final { |
| 16 | public: |
| 17 | // Constructors. |
| 18 | static Truncation None() { return Truncation(TruncationKind::kNone); } |
| 19 | static Truncation Bool() { return Truncation(TruncationKind::kBool); } |
| 20 | static Truncation Word32() { return Truncation(TruncationKind::kWord32); } |
| 21 | static Truncation Word64() { return Truncation(TruncationKind::kWord64); } |
| 22 | static Truncation Float32() { return Truncation(TruncationKind::kFloat32); } |
| 23 | static Truncation Float64() { return Truncation(TruncationKind::kFloat64); } |
| 24 | static Truncation Any() { return Truncation(TruncationKind::kAny); } |
| 25 | |
| 26 | static Truncation Generalize(Truncation t1, Truncation t2) { |
| 27 | return Truncation(Generalize(t1.kind(), t2.kind())); |
| 28 | } |
| 29 | |
| 30 | // Queries. |
| 31 | bool TruncatesToWord32() const { |
| 32 | return LessGeneral(kind_, TruncationKind::kWord32); |
| 33 | } |
| 34 | bool TruncatesNaNToZero() { |
| 35 | return LessGeneral(kind_, TruncationKind::kWord32) || |
| 36 | LessGeneral(kind_, TruncationKind::kBool); |
| 37 | } |
| 38 | bool TruncatesUndefinedToZeroOrNaN() { |
| 39 | return LessGeneral(kind_, TruncationKind::kFloat64) || |
| 40 | LessGeneral(kind_, TruncationKind::kWord64); |
| 41 | } |
| 42 | |
| 43 | // Operators. |
| 44 | bool operator==(Truncation other) const { return kind() == other.kind(); } |
| 45 | bool operator!=(Truncation other) const { return !(*this == other); } |
| 46 | |
| 47 | // Debug utilities. |
| 48 | const char* description() const; |
| 49 | bool IsLessGeneralThan(Truncation other) { |
| 50 | return LessGeneral(kind(), other.kind()); |
| 51 | } |
| 52 | |
| 53 | private: |
| 54 | enum class TruncationKind : uint8_t { |
| 55 | kNone, |
| 56 | kBool, |
| 57 | kWord32, |
| 58 | kWord64, |
| 59 | kFloat32, |
| 60 | kFloat64, |
| 61 | kAny |
| 62 | }; |
| 63 | |
| 64 | explicit Truncation(TruncationKind kind) : kind_(kind) {} |
| 65 | TruncationKind kind() const { return kind_; } |
| 66 | |
| 67 | TruncationKind kind_; |
| 68 | |
| 69 | static TruncationKind Generalize(TruncationKind rep1, TruncationKind rep2); |
| 70 | static bool LessGeneral(TruncationKind rep1, TruncationKind rep2); |
| 71 | }; |
| 72 | |
| 73 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 74 | // Contains logic related to changing the representation of values for constants |
| 75 | // and other nodes, as well as lowering Simplified->Machine operators. |
| 76 | // Eagerly folds any representation changes for constants. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 77 | class RepresentationChanger final { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 78 | public: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 79 | RepresentationChanger(JSGraph* jsgraph, Isolate* isolate) |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 80 | : jsgraph_(jsgraph), |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 81 | isolate_(isolate), |
| 82 | testing_type_errors_(false), |
| 83 | type_error_(false) {} |
| 84 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 85 | // Changes representation from {output_type} to {use_rep}. The {truncation} |
| 86 | // parameter is only used for sanity checking - if the changer cannot figure |
| 87 | // out signedness for the word32->float64 conversion, then we check that the |
| 88 | // uses truncate to word32 (so they do not care about signedness). |
| 89 | Node* GetRepresentationFor(Node* node, MachineRepresentation output_rep, |
| 90 | Type* output_type, MachineRepresentation use_rep, |
| 91 | Truncation truncation = Truncation::None()); |
| 92 | const Operator* Int32OperatorFor(IrOpcode::Value opcode); |
| 93 | const Operator* Uint32OperatorFor(IrOpcode::Value opcode); |
| 94 | const Operator* Float64OperatorFor(IrOpcode::Value opcode); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 95 | |
| 96 | MachineType TypeForBasePointer(const FieldAccess& access) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 97 | return access.tag() != 0 ? MachineType::AnyTagged() |
| 98 | : MachineType::Pointer(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | MachineType TypeForBasePointer(const ElementAccess& access) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 102 | return access.tag() != 0 ? MachineType::AnyTagged() |
| 103 | : MachineType::Pointer(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | private: |
| 107 | JSGraph* jsgraph_; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 108 | Isolate* isolate_; |
| 109 | |
| 110 | friend class RepresentationChangerTester; // accesses the below fields. |
| 111 | |
| 112 | bool testing_type_errors_; // If {true}, don't abort on a type error. |
| 113 | bool type_error_; // Set when a type error is detected. |
| 114 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 115 | Node* GetTaggedRepresentationFor(Node* node, MachineRepresentation output_rep, |
| 116 | Type* output_type); |
| 117 | Node* GetFloat32RepresentationFor(Node* node, |
| 118 | MachineRepresentation output_rep, |
| 119 | Type* output_type, Truncation truncation); |
| 120 | Node* GetFloat64RepresentationFor(Node* node, |
| 121 | MachineRepresentation output_rep, |
| 122 | Type* output_type, Truncation truncation); |
| 123 | Node* GetWord32RepresentationFor(Node* node, MachineRepresentation output_rep, |
| 124 | Type* output_type); |
| 125 | Node* GetBitRepresentationFor(Node* node, MachineRepresentation output_rep, |
| 126 | Type* output_type); |
| 127 | Node* GetWord64RepresentationFor(Node* node, MachineRepresentation output_rep, |
| 128 | Type* output_type); |
| 129 | Node* TypeError(Node* node, MachineRepresentation output_rep, |
| 130 | Type* output_type, MachineRepresentation use); |
| 131 | Node* MakeTruncatedInt32Constant(double value); |
| 132 | Node* InsertChangeFloat32ToFloat64(Node* node); |
| 133 | Node* InsertChangeTaggedToFloat64(Node* node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 134 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 135 | JSGraph* jsgraph() const { return jsgraph_; } |
| 136 | Isolate* isolate() const { return isolate_; } |
| 137 | Factory* factory() const { return isolate()->factory(); } |
| 138 | SimplifiedOperatorBuilder* simplified() { return jsgraph()->simplified(); } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 139 | MachineOperatorBuilder* machine() { return jsgraph()->machine(); } |
| 140 | }; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 141 | |
| 142 | } // namespace compiler |
| 143 | } // namespace internal |
| 144 | } // namespace v8 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 145 | |
| 146 | #endif // V8_COMPILER_REPRESENTATION_CHANGE_H_ |