| // 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_MACHINE_TYPE_H_ |
| #define V8_COMPILER_MACHINE_TYPE_H_ |
| |
| #include <iosfwd> |
| |
| #include "src/base/bits.h" |
| #include "src/globals.h" |
| #include "src/zone.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace compiler { |
| |
| // Machine-level types and representations. |
| // TODO(titzer): Use the real type system instead of MachineType. |
| enum MachineType { |
| // Representations. |
| kRepBit = 1 << 0, |
| kRepWord8 = 1 << 1, |
| kRepWord16 = 1 << 2, |
| kRepWord32 = 1 << 3, |
| kRepWord64 = 1 << 4, |
| kRepFloat32 = 1 << 5, |
| kRepFloat64 = 1 << 6, |
| kRepTagged = 1 << 7, |
| |
| // Types. |
| kTypeBool = 1 << 8, |
| kTypeInt32 = 1 << 9, |
| kTypeUint32 = 1 << 10, |
| kTypeInt64 = 1 << 11, |
| kTypeUint64 = 1 << 12, |
| kTypeNumber = 1 << 13, |
| kTypeAny = 1 << 14, |
| |
| // Machine types. |
| kMachNone = 0, |
| kMachBool = kRepBit | kTypeBool, |
| kMachFloat32 = kRepFloat32 | kTypeNumber, |
| kMachFloat64 = kRepFloat64 | kTypeNumber, |
| kMachInt8 = kRepWord8 | kTypeInt32, |
| kMachUint8 = kRepWord8 | kTypeUint32, |
| kMachInt16 = kRepWord16 | kTypeInt32, |
| kMachUint16 = kRepWord16 | kTypeUint32, |
| kMachInt32 = kRepWord32 | kTypeInt32, |
| kMachUint32 = kRepWord32 | kTypeUint32, |
| kMachInt64 = kRepWord64 | kTypeInt64, |
| kMachUint64 = kRepWord64 | kTypeUint64, |
| kMachIntPtr = (kPointerSize == 4) ? kMachInt32 : kMachInt64, |
| kMachUintPtr = (kPointerSize == 4) ? kMachUint32 : kMachUint64, |
| kMachPtr = (kPointerSize == 4) ? kRepWord32 : kRepWord64, |
| kMachAnyTagged = kRepTagged | kTypeAny |
| }; |
| |
| std::ostream& operator<<(std::ostream& os, const MachineType& type); |
| |
| typedef uint16_t MachineTypeUnion; |
| |
| // Globally useful machine types and constants. |
| const MachineTypeUnion kRepMask = kRepBit | kRepWord8 | kRepWord16 | |
| kRepWord32 | kRepWord64 | kRepFloat32 | |
| kRepFloat64 | kRepTagged; |
| const MachineTypeUnion kTypeMask = kTypeBool | kTypeInt32 | kTypeUint32 | |
| kTypeInt64 | kTypeUint64 | kTypeNumber | |
| kTypeAny; |
| |
| // Gets only the type of the given type. |
| inline MachineType TypeOf(MachineType machine_type) { |
| int result = machine_type & kTypeMask; |
| return static_cast<MachineType>(result); |
| } |
| |
| // Gets only the representation of the given type. |
| inline MachineType RepresentationOf(MachineType machine_type) { |
| int result = machine_type & kRepMask; |
| CHECK(base::bits::IsPowerOfTwo32(result)); |
| return static_cast<MachineType>(result); |
| } |
| |
| // Gets the log2 of the element size in bytes of the machine type. |
| inline int ElementSizeLog2Of(MachineType machine_type) { |
| switch (RepresentationOf(machine_type)) { |
| case kRepBit: |
| case kRepWord8: |
| return 0; |
| case kRepWord16: |
| return 1; |
| case kRepWord32: |
| case kRepFloat32: |
| return 2; |
| case kRepWord64: |
| case kRepFloat64: |
| return 3; |
| case kRepTagged: |
| return kPointerSizeLog2; |
| default: |
| break; |
| } |
| UNREACHABLE(); |
| return -1; |
| } |
| |
| // Gets the element size in bytes of the machine type. |
| inline int ElementSizeOf(MachineType machine_type) { |
| const int shift = ElementSizeLog2Of(machine_type); |
| DCHECK_NE(-1, shift); |
| return 1 << shift; |
| } |
| |
| // Describes the inputs and outputs of a function or call. |
| template <typename T> |
| class Signature : public ZoneObject { |
| public: |
| Signature(size_t return_count, size_t parameter_count, T* reps) |
| : return_count_(return_count), |
| parameter_count_(parameter_count), |
| reps_(reps) {} |
| |
| size_t return_count() const { return return_count_; } |
| size_t parameter_count() const { return parameter_count_; } |
| |
| T GetParam(size_t index) const { |
| DCHECK(index < parameter_count_); |
| return reps_[return_count_ + index]; |
| } |
| |
| T GetReturn(size_t index = 0) const { |
| DCHECK(index < return_count_); |
| return reps_[index]; |
| } |
| |
| // For incrementally building signatures. |
| class Builder { |
| public: |
| Builder(Zone* zone, size_t return_count, size_t parameter_count) |
| : return_count_(return_count), |
| parameter_count_(parameter_count), |
| zone_(zone), |
| rcursor_(0), |
| pcursor_(0), |
| buffer_(zone->NewArray<T>( |
| static_cast<int>(return_count + parameter_count))) {} |
| |
| const size_t return_count_; |
| const size_t parameter_count_; |
| |
| void AddReturn(T val) { |
| DCHECK(rcursor_ < return_count_); |
| buffer_[rcursor_++] = val; |
| } |
| void AddParam(T val) { |
| DCHECK(pcursor_ < parameter_count_); |
| buffer_[return_count_ + pcursor_++] = val; |
| } |
| Signature<T>* Build() { |
| DCHECK(rcursor_ == return_count_); |
| DCHECK(pcursor_ == parameter_count_); |
| return new (zone_) Signature<T>(return_count_, parameter_count_, buffer_); |
| } |
| |
| private: |
| Zone* zone_; |
| size_t rcursor_; |
| size_t pcursor_; |
| T* buffer_; |
| }; |
| |
| protected: |
| size_t return_count_; |
| size_t parameter_count_; |
| T* reps_; |
| }; |
| |
| typedef Signature<MachineType> MachineSignature; |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_COMPILER_MACHINE_TYPE_H_ |