| // Copyright 2014 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. |
| |
| #ifndef V8_COMPILER_SIMPLIFIED_OPERATOR_H_ |
| #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_ |
| |
| #include "src/compiler/machine-type.h" |
| #include "src/handles.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Forward declarations. |
| template <class> |
| class TypeImpl; |
| struct ZoneTypeConfig; |
| typedef TypeImpl<ZoneTypeConfig> Type; |
| class Zone; |
| |
| |
| namespace compiler { |
| |
| // Forward declarations. |
| class Operator; |
| struct SimplifiedOperatorBuilderImpl; |
| |
| |
| enum BaseTaggedness { kUntaggedBase, kTaggedBase }; |
| |
| OStream& operator<<(OStream&, BaseTaggedness); |
| |
| // An access descriptor for loads/stores of fixed structures like field |
| // accesses of heap objects. Accesses from either tagged or untagged base |
| // pointers are supported; untagging is done automatically during lowering. |
| struct FieldAccess { |
| BaseTaggedness base_is_tagged; // specifies if the base pointer is tagged. |
| int offset; // offset of the field, without tag. |
| Handle<Name> name; // debugging only. |
| Type* type; // type of the field. |
| MachineType machine_type; // machine type of the field. |
| |
| int tag() const { return base_is_tagged == kTaggedBase ? kHeapObjectTag : 0; } |
| }; |
| |
| |
| // An access descriptor for loads/stores of indexed structures like characters |
| // in strings or off-heap backing stores. Accesses from either tagged or |
| // untagged base pointers are supported; untagging is done automatically during |
| // lowering. |
| struct ElementAccess { |
| BaseTaggedness base_is_tagged; // specifies if the base pointer is tagged. |
| int header_size; // size of the header, without tag. |
| Type* type; // type of the element. |
| MachineType machine_type; // machine type of the element. |
| |
| int tag() const { return base_is_tagged == kTaggedBase ? kHeapObjectTag : 0; } |
| }; |
| |
| bool operator==(ElementAccess const& lhs, ElementAccess const& rhs); |
| bool operator!=(ElementAccess const& lhs, ElementAccess const& rhs); |
| |
| OStream& operator<<(OStream&, ElementAccess const&); |
| |
| |
| // If the accessed object is not a heap object, add this to the header_size. |
| static const int kNonHeapObjectHeaderSize = kHeapObjectTag; |
| |
| |
| const FieldAccess& FieldAccessOf(const Operator* op) WARN_UNUSED_RESULT; |
| const ElementAccess& ElementAccessOf(const Operator* op) WARN_UNUSED_RESULT; |
| |
| |
| // Interface for building simplified operators, which represent the |
| // medium-level operations of V8, including adding numbers, allocating objects, |
| // indexing into objects and arrays, etc. |
| // All operators are typed but many are representation independent. |
| |
| // Number values from JS can be in one of these representations: |
| // - Tagged: word-sized integer that is either |
| // - a signed small integer (31 or 32 bits plus a tag) |
| // - a tagged pointer to a HeapNumber object that has a float64 field |
| // - Int32: an untagged signed 32-bit integer |
| // - Uint32: an untagged unsigned 32-bit integer |
| // - Float64: an untagged float64 |
| |
| // Additional representations for intermediate code or non-JS code: |
| // - Int64: an untagged signed 64-bit integer |
| // - Uint64: an untagged unsigned 64-bit integer |
| // - Float32: an untagged float32 |
| |
| // Boolean values can be: |
| // - Bool: a tagged pointer to either the canonical JS #false or |
| // the canonical JS #true object |
| // - Bit: an untagged integer 0 or 1, but word-sized |
| class SimplifiedOperatorBuilder FINAL { |
| public: |
| explicit SimplifiedOperatorBuilder(Zone* zone); |
| |
| const Operator* BooleanNot(); |
| const Operator* BooleanToNumber(); |
| |
| const Operator* NumberEqual(); |
| const Operator* NumberLessThan(); |
| const Operator* NumberLessThanOrEqual(); |
| const Operator* NumberAdd(); |
| const Operator* NumberSubtract(); |
| const Operator* NumberMultiply(); |
| const Operator* NumberDivide(); |
| const Operator* NumberModulus(); |
| const Operator* NumberToInt32(); |
| const Operator* NumberToUint32(); |
| |
| const Operator* ReferenceEqual(Type* type); |
| |
| const Operator* StringEqual(); |
| const Operator* StringLessThan(); |
| const Operator* StringLessThanOrEqual(); |
| const Operator* StringAdd(); |
| |
| const Operator* ChangeTaggedToInt32(); |
| const Operator* ChangeTaggedToUint32(); |
| const Operator* ChangeTaggedToFloat64(); |
| const Operator* ChangeInt32ToTagged(); |
| const Operator* ChangeUint32ToTagged(); |
| const Operator* ChangeFloat64ToTagged(); |
| const Operator* ChangeBoolToBit(); |
| const Operator* ChangeBitToBool(); |
| |
| const Operator* LoadField(const FieldAccess&); |
| const Operator* StoreField(const FieldAccess&); |
| |
| // load-element [base + index], length |
| const Operator* LoadElement(ElementAccess const&); |
| |
| // store-element [base + index], length, value |
| const Operator* StoreElement(ElementAccess const&); |
| |
| private: |
| Zone* zone() const { return zone_; } |
| |
| const SimplifiedOperatorBuilderImpl& impl_; |
| Zone* const zone_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorBuilder); |
| }; |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_COMPILER_SIMPLIFIED_OPERATOR_H_ |