| // Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #ifndef RUNTIME_VM_COMPILER_FFI_NATIVE_LOCATION_H_ |
| #define RUNTIME_VM_COMPILER_FFI_NATIVE_LOCATION_H_ |
| |
| #if defined(DART_PRECOMPILED_RUNTIME) |
| #error "AOT runtime should not use compiler sources (including header files)" |
| #endif // defined(DART_PRECOMPILED_RUNTIME) |
| |
| #include "platform/assert.h" |
| #include "vm/compiler/ffi/native_type.h" |
| #include "vm/compiler/runtime_api.h" |
| #include "vm/constants.h" |
| #include "vm/growable_array.h" |
| |
| #if !defined(FFI_UNIT_TESTS) |
| #include "vm/compiler/backend/locations.h" |
| #endif |
| |
| namespace dart { |
| |
| class BaseTextBuffer; |
| |
| namespace compiler { |
| |
| namespace ffi { |
| |
| class NativeRegistersLocation; |
| class NativeFpuRegistersLocation; |
| class NativeStackLocation; |
| class MultipleNativeLocations; |
| class PointerToMemoryLocation; |
| |
| // NativeLocation objects are used in the FFI to describe argument and return |
| // value locations in all native ABIs that the FFI supports. |
| // |
| // NativeLocations contain two NativeTypes. |
| // * The payload type. |
| // * The container type, equal to or larger than the payload. If the |
| // container is larger than the payload, the upper bits are defined by sign |
| // or zero extension. |
| // Container type is also used to denote an integer container when floating |
| // point values are passed in integer registers. |
| // |
| // NativeLocations can express things that dart::Locations cannot express: |
| // * Multiple consecutive registers. |
| // * Multiple sizes of FPU registers (e.g. S, D, and Q on Arm32). |
| // * Arbitrary byte-size stack locations, at byte-size offsets. |
| // (The Location class uses word-size offsets.) |
| // * Pointers to a memory location. |
| // * Split between multiple registers and stack. |
| // |
| // NativeLocations cannot express the following dart::Locations: |
| // * No PairLocations. Instead, NativeRegistersLocations can have multiple |
| // registers, and NativeStackLocations can have arbitrary types. |
| // * No ConstantLocations. |
| // |
| // NativeLocation does not satisfy the invariant of Location: bitwise |
| // inequality cannot be used to determine disjointness. |
| class NativeLocation : public ZoneAllocated { |
| public: |
| #if !defined(FFI_UNIT_TESTS) |
| static bool LocationCanBeExpressed(Location loc, Representation rep); |
| static NativeLocation& FromLocation(Zone* zone, |
| Location loc, |
| Representation rep); |
| static NativeLocation& FromPairLocation(Zone* zone, |
| Location loc, |
| Representation rep, |
| intptr_t index); |
| #endif |
| |
| // The type of the data at this location. |
| const NativeType& payload_type() const { return payload_type_; } |
| |
| // The location container size, possibly larger than data. |
| // |
| // If the container is larger than the data, the remaining bits are _not_ |
| // undefined. For example a uint8 inside a uint32 has the upper 24 bits set |
| // to 0. Effectively allowing the value to be read as uint8, uint16 and |
| // uint32. |
| const NativeType& container_type() const { return container_type_; } |
| |
| virtual NativeLocation& WithOtherNativeType( |
| Zone* zone, |
| const NativeType& new_payload_type, |
| const NativeType& new_container_type) const = 0; |
| |
| #if defined(TARGET_ARCH_ARM) |
| const NativeLocation& WidenToQFpuRegister(Zone* zone) const; |
| #endif // defined(TARGET_ARCH_ARM) |
| |
| NativeLocation& WidenTo4Bytes(Zone* zone) const; |
| |
| virtual bool IsRegisters() const { return false; } |
| virtual bool IsFpuRegisters() const { return false; } |
| virtual bool IsStack() const { return false; } |
| virtual bool IsMultiple() const { return false; } |
| virtual bool IsPointerToMemory() const { return false; } |
| |
| virtual bool IsExpressibleAsLocation() const { return false; } |
| #if !defined(FFI_UNIT_TESTS) |
| virtual Location AsLocation() const { |
| ASSERT(IsExpressibleAsLocation()); |
| UNREACHABLE(); |
| } |
| #endif |
| |
| virtual void PrintTo(BaseTextBuffer* f) const; |
| const char* ToCString(Zone* zone) const; |
| #if !defined(FFI_UNIT_TESTS) |
| const char* ToCString() const; |
| #endif |
| |
| const NativeRegistersLocation& AsRegisters() const; |
| const NativeFpuRegistersLocation& AsFpuRegisters() const; |
| const NativeStackLocation& AsStack() const; |
| const MultipleNativeLocations& AsMultiple() const; |
| const PointerToMemoryLocation& AsPointerToMemory() const; |
| |
| // Retrieve one part from this location when it is split into multiple parts. |
| virtual NativeLocation& Split(Zone* zone, |
| intptr_t num_parts, |
| intptr_t index) const { |
| UNREACHABLE(); |
| } |
| |
| // Return the top of the stack in bytes. Recurses over its constituents when |
| // MultipleNativeLocations. |
| virtual intptr_t StackTopInBytes() const { return 0; } |
| |
| // Equality of location, ignores the payload and container native types. |
| virtual bool Equals(const NativeLocation& other) const { UNREACHABLE(); } |
| |
| virtual ~NativeLocation() {} |
| |
| protected: |
| NativeLocation(const NativeType& payload_type, |
| const NativeType& container_type) |
| : payload_type_(payload_type), container_type_(container_type) {} |
| |
| private: |
| const NativeType& payload_type_; |
| // The location container size, possibly larger than data. |
| // |
| // If the container is larger than the data, the remaining bits are _not_ |
| // undefined. For example a uint8 inside a uint32 has the upper 24 bits set |
| // to 0. Effectively allowing the value to be read as uint8, uint16 and |
| // uint32. |
| const NativeType& container_type_; |
| }; |
| |
| class NativeRegistersLocation : public NativeLocation { |
| public: |
| NativeRegistersLocation(const NativeType& payload_type, |
| const NativeType& container_type, |
| ZoneGrowableArray<Register>* registers) |
| : NativeLocation(payload_type, container_type), regs_(registers) {} |
| NativeRegistersLocation(Zone* zone, |
| const NativeType& payload_type, |
| const NativeType& container_type, |
| Register reg) |
| : NativeLocation(payload_type, container_type) { |
| regs_ = new (zone) ZoneGrowableArray<Register>(zone, 1); |
| regs_->Add(reg); |
| } |
| NativeRegistersLocation(Zone* zone, |
| const NativeType& payload_type, |
| const NativeType& container_type, |
| Register register1, |
| Register register2) |
| : NativeLocation(payload_type, container_type) { |
| regs_ = new (zone) ZoneGrowableArray<Register>(zone, 2); |
| regs_->Add(register1); |
| regs_->Add(register2); |
| } |
| virtual ~NativeRegistersLocation() {} |
| |
| virtual NativeRegistersLocation& WithOtherNativeType( |
| Zone* zone, |
| const NativeType& new_payload_type, |
| const NativeType& new_container_type) const { |
| return *new (zone) |
| NativeRegistersLocation(new_payload_type, new_container_type, regs_); |
| } |
| |
| virtual bool IsRegisters() const { return true; } |
| virtual bool IsExpressibleAsLocation() const { |
| return num_regs() == 1 || num_regs() == 2; |
| } |
| #if !defined(FFI_UNIT_TESTS) |
| virtual Location AsLocation() const; |
| #endif |
| intptr_t num_regs() const { return regs_->length(); } |
| Register reg_at(intptr_t index) const { return regs_->At(index); } |
| |
| virtual NativeRegistersLocation& Split(Zone* zone, |
| intptr_t num_parts, |
| intptr_t index) const; |
| |
| virtual void PrintTo(BaseTextBuffer* f) const; |
| |
| virtual bool Equals(const NativeLocation& other) const; |
| |
| private: |
| ZoneGrowableArray<Register>* regs_; |
| |
| DISALLOW_COPY_AND_ASSIGN(NativeRegistersLocation); |
| }; |
| |
| enum FpuRegisterKind { |
| kQuadFpuReg, // 16 bytes |
| kDoubleFpuReg, // 8 bytes, a double |
| kSingleFpuReg // 4 bytes, a float |
| }; |
| |
| intptr_t SizeFromFpuRegisterKind(FpuRegisterKind kind); |
| FpuRegisterKind FpuRegisterKindFromSize(intptr_t size_in_bytes); |
| |
| class NativeFpuRegistersLocation : public NativeLocation { |
| public: |
| NativeFpuRegistersLocation(const NativeType& payload_type, |
| const NativeType& container_type, |
| FpuRegisterKind fpu_reg_kind, |
| intptr_t fpu_register) |
| : NativeLocation(payload_type, container_type), |
| fpu_reg_kind_(fpu_reg_kind), |
| fpu_reg_(fpu_register) {} |
| NativeFpuRegistersLocation(const NativeType& payload_type, |
| const NativeType& container_type, |
| FpuRegister fpu_register) |
| : NativeLocation(payload_type, container_type), |
| fpu_reg_kind_(kQuadFpuReg), |
| fpu_reg_(fpu_register) {} |
| #if defined(TARGET_ARCH_ARM) |
| NativeFpuRegistersLocation(const NativeType& payload_type, |
| const NativeType& container_type, |
| DRegister fpu_register) |
| : NativeLocation(payload_type, container_type), |
| fpu_reg_kind_(kDoubleFpuReg), |
| fpu_reg_(fpu_register) {} |
| NativeFpuRegistersLocation(const NativeType& payload_type, |
| const NativeType& container_type, |
| SRegister fpu_register) |
| : NativeLocation(payload_type, container_type), |
| fpu_reg_kind_(kSingleFpuReg), |
| fpu_reg_(fpu_register) {} |
| #endif // defined(TARGET_ARCH_ARM) |
| virtual ~NativeFpuRegistersLocation() {} |
| |
| virtual NativeFpuRegistersLocation& WithOtherNativeType( |
| Zone* zone, |
| const NativeType& new_payload_type, |
| const NativeType& new_container_type) const { |
| return *new (zone) NativeFpuRegistersLocation( |
| new_payload_type, new_container_type, fpu_reg_kind_, fpu_reg_); |
| } |
| virtual bool IsFpuRegisters() const { return true; } |
| virtual bool IsExpressibleAsLocation() const { |
| return fpu_reg_kind_ == kQuadFpuReg; |
| } |
| #if !defined(FFI_UNIT_TESTS) |
| virtual Location AsLocation() const { |
| ASSERT(IsExpressibleAsLocation()); |
| return Location::FpuRegisterLocation(fpu_reg()); |
| } |
| #endif |
| FpuRegisterKind fpu_reg_kind() const { return fpu_reg_kind_; } |
| FpuRegister fpu_reg() const { |
| ASSERT(fpu_reg_kind_ == kQuadFpuReg); |
| return static_cast<FpuRegister>(fpu_reg_); |
| } |
| #if defined(TARGET_ARCH_ARM) |
| DRegister fpu_d_reg() const { |
| ASSERT(fpu_reg_kind_ == kDoubleFpuReg); |
| return static_cast<DRegister>(fpu_reg_); |
| } |
| SRegister fpu_s_reg() const { |
| ASSERT(fpu_reg_kind_ == kSingleFpuReg); |
| return static_cast<SRegister>(fpu_reg_); |
| } |
| DRegister fpu_as_d_reg() const; |
| SRegister fpu_as_s_reg() const; |
| |
| bool IsLowestBits() const; |
| #endif // defined(TARGET_ARCH_ARM) |
| |
| virtual void PrintTo(BaseTextBuffer* f) const; |
| |
| virtual bool Equals(const NativeLocation& other) const; |
| |
| private: |
| FpuRegisterKind fpu_reg_kind_; |
| intptr_t fpu_reg_; |
| DISALLOW_COPY_AND_ASSIGN(NativeFpuRegistersLocation); |
| }; |
| |
| class NativeStackLocation : public NativeLocation { |
| public: |
| NativeStackLocation(const NativeType& payload_type, |
| const NativeType& container_type, |
| Register base_register, |
| intptr_t offset_in_bytes) |
| : NativeLocation(payload_type, container_type), |
| base_register_(base_register), |
| offset_in_bytes_(offset_in_bytes) {} |
| virtual ~NativeStackLocation() {} |
| |
| virtual NativeStackLocation& WithOtherNativeType( |
| Zone* zone, |
| const NativeType& new_payload_type, |
| const NativeType& new_container_type) const { |
| return *new (zone) NativeStackLocation(new_payload_type, new_container_type, |
| base_register_, offset_in_bytes_); |
| } |
| |
| virtual bool IsStack() const { return true; } |
| virtual bool IsExpressibleAsLocation() const { |
| const intptr_t size = payload_type().SizeInBytes(); |
| const intptr_t size_slots = size / compiler::target::kWordSize; |
| return offset_in_bytes_ % compiler::target::kWordSize == 0 && |
| size % compiler::target::kWordSize == 0 && |
| (size_slots == 1 || size_slots == 2); |
| } |
| |
| #if !defined(FFI_UNIT_TESTS) |
| virtual Location AsLocation() const; |
| |
| // ConstantInstr expects DoubleStackSlot for doubles, even on 64-bit systems. |
| // |
| // So this return a wrong-sized Location on purpose. |
| Location AsDoubleStackSlotLocation() const { |
| ASSERT(compiler::target::kWordSize == 8); |
| return Location::DoubleStackSlot(offset_in_words(), base_register_); |
| } |
| #endif |
| |
| virtual NativeStackLocation& Split(Zone* zone, |
| intptr_t num_parts, |
| intptr_t index) const; |
| |
| virtual intptr_t StackTopInBytes() const { |
| return offset_in_bytes() + container_type().SizeInBytes(); |
| } |
| |
| virtual void PrintTo(BaseTextBuffer* f) const; |
| |
| virtual bool Equals(const NativeLocation& other) const; |
| |
| Register base_register() const { return base_register_; } |
| intptr_t offset_in_bytes() const { return offset_in_bytes_; } |
| |
| private: |
| intptr_t offset_in_words() const { |
| ASSERT(offset_in_bytes_ % compiler::target::kWordSize == 0); |
| return offset_in_bytes_ / compiler::target::kWordSize; |
| } |
| |
| Register base_register_; |
| intptr_t offset_in_bytes_; |
| |
| DISALLOW_COPY_AND_ASSIGN(NativeStackLocation); |
| }; |
| |
| // The location of a pointer pointing to a compound. |
| // |
| // For arguments a pointer to a copy of an object. The backing copy of the |
| // object typically resides on the stack. |
| // |
| // For return values a pointer to empty space that should hold the object. This |
| // space also typically resides on the stack. |
| class PointerToMemoryLocation : public NativeLocation { |
| public: |
| PointerToMemoryLocation(const NativeLocation& pointer_location, |
| const NativeCompoundType& object_pointed_to) |
| : NativeLocation(object_pointed_to, object_pointed_to), |
| pointer_location_(pointer_location), |
| pointer_return_location_(pointer_location) { |
| ASSERT(pointer_location.IsRegisters() || pointer_location.IsStack()); |
| } |
| PointerToMemoryLocation(const NativeLocation& pointer_location, |
| const NativeLocation& pointer_return_location, |
| const NativeCompoundType& object_pointed_to) |
| : NativeLocation(object_pointed_to, object_pointed_to), |
| pointer_location_(pointer_location), |
| pointer_return_location_(pointer_return_location) { |
| ASSERT(pointer_location.IsRegisters() || pointer_location.IsStack()); |
| } |
| |
| virtual ~PointerToMemoryLocation() {} |
| |
| virtual bool IsPointerToMemory() const { return true; } |
| |
| virtual void PrintTo(BaseTextBuffer* f) const; |
| |
| virtual bool Equals(const NativeLocation& other) const; |
| |
| virtual NativeLocation& WithOtherNativeType( |
| Zone* zone, |
| const NativeType& new_payload_type, |
| const NativeType& new_container_type) const { |
| UNREACHABLE(); |
| } |
| |
| virtual intptr_t StackTopInBytes() const { |
| return pointer_location().StackTopInBytes(); |
| } |
| |
| // The location where the pointer is passed to the function. |
| const NativeLocation& pointer_location() const { return pointer_location_; } |
| |
| // The location where the pointer is returned from the function. |
| const NativeLocation& pointer_return_location() const { |
| return pointer_return_location_; |
| } |
| |
| private: |
| const NativeLocation& pointer_location_; |
| // The return location is only in use for return values, not for arguments. |
| const NativeLocation& pointer_return_location_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PointerToMemoryLocation); |
| }; |
| |
| using NativeLocations = ZoneGrowableArray<const NativeLocation*>; |
| |
| // A struct broken up over multiple native locations. |
| class MultipleNativeLocations : public NativeLocation { |
| public: |
| MultipleNativeLocations(const NativeCompoundType& payload_type, |
| const NativeLocations& locations) |
| : NativeLocation(payload_type, payload_type), locations_(locations) {} |
| virtual ~MultipleNativeLocations() {} |
| |
| virtual bool IsMultiple() const { return true; } |
| |
| virtual void PrintTo(BaseTextBuffer* f) const; |
| |
| virtual NativeLocation& WithOtherNativeType( |
| Zone* zone, |
| const NativeType& new_payload_type, |
| const NativeType& new_container_type) const { |
| UNREACHABLE(); |
| } |
| |
| virtual intptr_t StackTopInBytes() const; |
| |
| const NativeLocations& locations() const { return locations_; } |
| |
| private: |
| const NativeLocations& locations_; |
| DISALLOW_COPY_AND_ASSIGN(MultipleNativeLocations); |
| }; |
| |
| #if !defined(FFI_UNIT_TESTS) |
| // Return a memory operand for stack slot locations. |
| compiler::Address NativeLocationToStackSlotAddress( |
| const NativeStackLocation& loc); |
| #endif |
| |
| } // namespace ffi |
| |
| } // namespace compiler |
| |
| } // namespace dart |
| |
| #endif // RUNTIME_VM_COMPILER_FFI_NATIVE_LOCATION_H_ |
