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1 // Copyright 2014 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_COMPILER_SIMPLIFIED_OPERATOR_H_ | 5 #ifndef V8_COMPILER_SIMPLIFIED_OPERATOR_H_ |
6 #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_ | 6 #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_ |
7 | 7 |
8 #include "src/compiler/machine-operator.h" | 8 #include "src/compiler/machine-operator.h" |
9 #include "src/compiler/opcodes.h" | 9 #include "src/compiler/opcodes.h" |
10 #include "src/zone.h" | 10 #include "src/zone.h" |
11 | 11 |
12 namespace v8 { | 12 namespace v8 { |
13 namespace internal { | 13 namespace internal { |
14 namespace compiler { | 14 namespace compiler { |
15 | 15 |
16 // An access descriptor for loads/stores from/to fixed structures | 16 enum BaseTaggedness { kUntaggedBase, kTaggedBase }; |
17 // like field accesses of heap objects. | 17 |
| 18 // An access descriptor for loads/stores of fixed structures like field |
| 19 // accesses of heap objects. Accesses from either tagged or untagged base |
| 20 // pointers are supported; untagging is done automatically during lowering. |
18 struct FieldAccess { | 21 struct FieldAccess { |
19 int offset; | 22 BaseTaggedness base_is_tagged; // specifies if the base pointer is tagged. |
20 Handle<Name> name; // debug only. | 23 int offset; // offset of the field, without tag. |
21 Type* type; | 24 Handle<Name> name; // debugging only. |
22 MachineRepresentation representation; | 25 Type* type; // type of the field. |
| 26 MachineRepresentation representation; // machine representation of field. |
| 27 |
| 28 int tag() const { return base_is_tagged == kTaggedBase ? kHeapObjectTag : 0; } |
23 }; | 29 }; |
24 | 30 |
25 | 31 |
26 // An access descriptor for loads/stores of indexed structures | 32 // An access descriptor for loads/stores of indexed structures like characters |
27 // like characters in strings or off-heap backing stores. | 33 // in strings or off-heap backing stores. Accesses from either tagged or |
| 34 // untagged base pointers are supported; untagging is done automatically during |
| 35 // lowering. |
28 struct ElementAccess { | 36 struct ElementAccess { |
29 int header_size; | 37 BaseTaggedness base_is_tagged; // specifies if the base pointer is tagged. |
30 Type* type; | 38 int header_size; // size of the header, without tag. |
31 MachineRepresentation representation; | 39 Type* type; // type of the element. |
| 40 MachineRepresentation representation; // machine representation of element. |
| 41 |
| 42 int tag() const { return base_is_tagged == kTaggedBase ? kHeapObjectTag : 0; } |
32 }; | 43 }; |
33 | 44 |
34 | 45 |
35 // If the accessed object is not a heap object, add this to the header_size. | 46 // If the accessed object is not a heap object, add this to the header_size. |
36 static const int kNonHeapObjectHeaderSize = kHeapObjectTag; | 47 static const int kNonHeapObjectHeaderSize = kHeapObjectTag; |
37 | 48 |
38 | 49 |
39 // Specialization for static parameters of type {FieldAccess}. | 50 // Specialization for static parameters of type {FieldAccess}. |
40 template <> | 51 template <> |
41 struct StaticParameterTraits<const FieldAccess> { | 52 struct StaticParameterTraits<const FieldAccess> { |
42 static OStream& PrintTo(OStream& os, const FieldAccess& val) { // NOLINT | 53 static OStream& PrintTo(OStream& os, const FieldAccess& val) { // NOLINT |
43 return os << val.offset; | 54 return os << val.offset; |
44 } | 55 } |
45 static int HashCode(const FieldAccess& val) { | 56 static int HashCode(const FieldAccess& val) { |
46 return (val.offset < 16) | (val.representation & 0xffff); | 57 return (val.offset < 16) | (val.representation & 0xffff); |
47 } | 58 } |
48 static bool Equals(const FieldAccess& a, const FieldAccess& b) { | 59 static bool Equals(const FieldAccess& a, const FieldAccess& b) { |
49 return a.offset == b.offset && a.representation == b.representation && | 60 return a.base_is_tagged == b.base_is_tagged && a.offset == b.offset && |
50 a.type->Is(b.type); | 61 a.representation == b.representation && a.type->Is(b.type); |
51 } | 62 } |
52 }; | 63 }; |
53 | 64 |
54 | 65 |
55 // Specialization for static parameters of type {ElementAccess}. | 66 // Specialization for static parameters of type {ElementAccess}. |
56 template <> | 67 template <> |
57 struct StaticParameterTraits<const ElementAccess> { | 68 struct StaticParameterTraits<const ElementAccess> { |
58 static OStream& PrintTo(OStream& os, const ElementAccess& val) { // NOLINT | 69 static OStream& PrintTo(OStream& os, const ElementAccess& val) { // NOLINT |
59 return os << val.header_size; | 70 return os << val.header_size; |
60 } | 71 } |
61 static int HashCode(const ElementAccess& val) { | 72 static int HashCode(const ElementAccess& val) { |
62 return (val.header_size < 16) | (val.representation & 0xffff); | 73 return (val.header_size < 16) | (val.representation & 0xffff); |
63 } | 74 } |
64 static bool Equals(const ElementAccess& a, const ElementAccess& b) { | 75 static bool Equals(const ElementAccess& a, const ElementAccess& b) { |
65 return a.header_size == b.header_size && | 76 return a.base_is_tagged == b.base_is_tagged && |
| 77 a.header_size == b.header_size && |
66 a.representation == b.representation && a.type->Is(b.type); | 78 a.representation == b.representation && a.type->Is(b.type); |
67 } | 79 } |
68 }; | 80 }; |
69 | 81 |
70 | 82 |
71 inline const FieldAccess FieldAccessOf(Operator* op) { | 83 inline const FieldAccess FieldAccessOf(Operator* op) { |
72 ASSERT(op->opcode() == IrOpcode::kLoadField || | 84 ASSERT(op->opcode() == IrOpcode::kLoadField || |
73 op->opcode() == IrOpcode::kStoreField); | 85 op->opcode() == IrOpcode::kStoreField); |
74 return static_cast<Operator1<FieldAccess>*>(op)->parameter(); | 86 return static_cast<Operator1<FieldAccess>*>(op)->parameter(); |
75 } | 87 } |
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168 #undef SIMPLE | 180 #undef SIMPLE |
169 | 181 |
170 private: | 182 private: |
171 Zone* zone_; | 183 Zone* zone_; |
172 }; | 184 }; |
173 } | 185 } |
174 } | 186 } |
175 } // namespace v8::internal::compiler | 187 } // namespace v8::internal::compiler |
176 | 188 |
177 #endif // V8_COMPILER_SIMPLIFIED_OPERATOR_H_ | 189 #endif // V8_COMPILER_SIMPLIFIED_OPERATOR_H_ |
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