/* * Copyright (C) 2016 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef ART_COMPILER_OPTIMIZING_CODE_GENERATOR_ARM_VIXL_H_ #define ART_COMPILER_OPTIMIZING_CODE_GENERATOR_ARM_VIXL_H_ #include "base/enums.h" #include "code_generator.h" #include "common_arm.h" #include "dex/string_reference.h" #include "dex/type_reference.h" #include "driver/compiler_options.h" #include "nodes.h" #include "parallel_move_resolver.h" #include "utils/arm/assembler_arm_vixl.h" // TODO(VIXL): make vixl clean wrt -Wshadow. #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wshadow" #include "aarch32/constants-aarch32.h" #include "aarch32/instructions-aarch32.h" #include "aarch32/macro-assembler-aarch32.h" #pragma GCC diagnostic pop namespace art { namespace linker { class Thumb2RelativePatcherTest; } // namespace linker namespace arm { // This constant is used as an approximate margin when emission of veneer and literal pools // must be blocked. static constexpr int kMaxMacroInstructionSizeInBytes = 15 * vixl::aarch32::kMaxInstructionSizeInBytes; static const vixl::aarch32::Register kParameterCoreRegistersVIXL[] = { vixl::aarch32::r1, vixl::aarch32::r2, vixl::aarch32::r3 }; static const size_t kParameterCoreRegistersLengthVIXL = arraysize(kParameterCoreRegistersVIXL); static const vixl::aarch32::SRegister kParameterFpuRegistersVIXL[] = { vixl::aarch32::s0, vixl::aarch32::s1, vixl::aarch32::s2, vixl::aarch32::s3, vixl::aarch32::s4, vixl::aarch32::s5, vixl::aarch32::s6, vixl::aarch32::s7, vixl::aarch32::s8, vixl::aarch32::s9, vixl::aarch32::s10, vixl::aarch32::s11, vixl::aarch32::s12, vixl::aarch32::s13, vixl::aarch32::s14, vixl::aarch32::s15 }; static const size_t kParameterFpuRegistersLengthVIXL = arraysize(kParameterFpuRegistersVIXL); static const vixl::aarch32::Register kMethodRegister = vixl::aarch32::r0; // Callee saves core registers r5, r6, r7, r8 (except when emitting Baker // read barriers, where it is used as Marking Register), r10, r11, and lr. static const vixl::aarch32::RegisterList kCoreCalleeSaves = vixl::aarch32::RegisterList::Union( vixl::aarch32::RegisterList(vixl::aarch32::r5, vixl::aarch32::r6, vixl::aarch32::r7), // Do not consider r8 as a callee-save register with Baker read barriers. ((kEmitCompilerReadBarrier && kUseBakerReadBarrier) ? vixl::aarch32::RegisterList() : vixl::aarch32::RegisterList(vixl::aarch32::r8)), vixl::aarch32::RegisterList(vixl::aarch32::r10, vixl::aarch32::r11, vixl::aarch32::lr)); // Callee saves FP registers s16 to s31 inclusive. static const vixl::aarch32::SRegisterList kFpuCalleeSaves = vixl::aarch32::SRegisterList(vixl::aarch32::s16, 16); static const vixl::aarch32::Register kRuntimeParameterCoreRegistersVIXL[] = { vixl::aarch32::r0, vixl::aarch32::r1, vixl::aarch32::r2, vixl::aarch32::r3 }; static const size_t kRuntimeParameterCoreRegistersLengthVIXL = arraysize(kRuntimeParameterCoreRegistersVIXL); static const vixl::aarch32::SRegister kRuntimeParameterFpuRegistersVIXL[] = { vixl::aarch32::s0, vixl::aarch32::s1, vixl::aarch32::s2, vixl::aarch32::s3 }; static const size_t kRuntimeParameterFpuRegistersLengthVIXL = arraysize(kRuntimeParameterFpuRegistersVIXL); class LoadClassSlowPathARMVIXL; class CodeGeneratorARMVIXL; using VIXLInt32Literal = vixl::aarch32::Literal; using VIXLUInt32Literal = vixl::aarch32::Literal; class JumpTableARMVIXL : public DeletableArenaObject { public: explicit JumpTableARMVIXL(HPackedSwitch* switch_instr) : switch_instr_(switch_instr), table_start_(), bb_addresses_(switch_instr->GetAllocator()->Adapter(kArenaAllocCodeGenerator)) { uint32_t num_entries = switch_instr_->GetNumEntries(); for (uint32_t i = 0; i < num_entries; i++) { VIXLInt32Literal *lit = new VIXLInt32Literal(0, vixl32::RawLiteral::kManuallyPlaced); bb_addresses_.emplace_back(lit); } } vixl::aarch32::Label* GetTableStartLabel() { return &table_start_; } void EmitTable(CodeGeneratorARMVIXL* codegen); void FixTable(CodeGeneratorARMVIXL* codegen); private: HPackedSwitch* const switch_instr_; vixl::aarch32::Label table_start_; ArenaVector> bb_addresses_; DISALLOW_COPY_AND_ASSIGN(JumpTableARMVIXL); }; class InvokeRuntimeCallingConventionARMVIXL : public CallingConvention { public: InvokeRuntimeCallingConventionARMVIXL() : CallingConvention(kRuntimeParameterCoreRegistersVIXL, kRuntimeParameterCoreRegistersLengthVIXL, kRuntimeParameterFpuRegistersVIXL, kRuntimeParameterFpuRegistersLengthVIXL, kArmPointerSize) {} private: DISALLOW_COPY_AND_ASSIGN(InvokeRuntimeCallingConventionARMVIXL); }; class InvokeDexCallingConventionARMVIXL : public CallingConvention { public: InvokeDexCallingConventionARMVIXL() : CallingConvention(kParameterCoreRegistersVIXL, kParameterCoreRegistersLengthVIXL, kParameterFpuRegistersVIXL, kParameterFpuRegistersLengthVIXL, kArmPointerSize) {} private: DISALLOW_COPY_AND_ASSIGN(InvokeDexCallingConventionARMVIXL); }; class InvokeDexCallingConventionVisitorARMVIXL : public InvokeDexCallingConventionVisitor { public: InvokeDexCallingConventionVisitorARMVIXL() {} virtual ~InvokeDexCallingConventionVisitorARMVIXL() {} Location GetNextLocation(DataType::Type type) override; Location GetReturnLocation(DataType::Type type) const override; Location GetMethodLocation() const override; private: InvokeDexCallingConventionARMVIXL calling_convention; uint32_t double_index_ = 0; DISALLOW_COPY_AND_ASSIGN(InvokeDexCallingConventionVisitorARMVIXL); }; class CriticalNativeCallingConventionVisitorARMVIXL : public InvokeDexCallingConventionVisitor { public: explicit CriticalNativeCallingConventionVisitorARMVIXL(bool for_register_allocation) : for_register_allocation_(for_register_allocation) {} virtual ~CriticalNativeCallingConventionVisitorARMVIXL() {} Location GetNextLocation(DataType::Type type) override; Location GetReturnLocation(DataType::Type type) const override; Location GetMethodLocation() const override; size_t GetStackOffset() const { return stack_offset_; } private: // Register allocator does not support adjusting frame size, so we cannot provide final locations // of stack arguments for register allocation. We ask the register allocator for any location and // move these arguments to the right place after adjusting the SP when generating the call. const bool for_register_allocation_; size_t gpr_index_ = 0u; size_t stack_offset_ = 0u; DISALLOW_COPY_AND_ASSIGN(CriticalNativeCallingConventionVisitorARMVIXL); }; class FieldAccessCallingConventionARMVIXL : public FieldAccessCallingConvention { public: FieldAccessCallingConventionARMVIXL() {} Location GetObjectLocation() const override { return helpers::LocationFrom(vixl::aarch32::r1); } Location GetFieldIndexLocation() const override { return helpers::LocationFrom(vixl::aarch32::r0); } Location GetReturnLocation(DataType::Type type) const override { return DataType::Is64BitType(type) ? helpers::LocationFrom(vixl::aarch32::r0, vixl::aarch32::r1) : helpers::LocationFrom(vixl::aarch32::r0); } Location GetSetValueLocation(DataType::Type type, bool is_instance) const override { return DataType::Is64BitType(type) ? helpers::LocationFrom(vixl::aarch32::r2, vixl::aarch32::r3) : (is_instance ? helpers::LocationFrom(vixl::aarch32::r2) : helpers::LocationFrom(vixl::aarch32::r1)); } Location GetFpuLocation(DataType::Type type) const override { return DataType::Is64BitType(type) ? helpers::LocationFrom(vixl::aarch32::s0, vixl::aarch32::s1) : helpers::LocationFrom(vixl::aarch32::s0); } private: DISALLOW_COPY_AND_ASSIGN(FieldAccessCallingConventionARMVIXL); }; class SlowPathCodeARMVIXL : public SlowPathCode { public: explicit SlowPathCodeARMVIXL(HInstruction* instruction) : SlowPathCode(instruction), entry_label_(), exit_label_() {} vixl::aarch32::Label* GetEntryLabel() { return &entry_label_; } vixl::aarch32::Label* GetExitLabel() { return &exit_label_; } void SaveLiveRegisters(CodeGenerator* codegen, LocationSummary* locations) override; void RestoreLiveRegisters(CodeGenerator* codegen, LocationSummary* locations) override; private: vixl::aarch32::Label entry_label_; vixl::aarch32::Label exit_label_; DISALLOW_COPY_AND_ASSIGN(SlowPathCodeARMVIXL); }; class ParallelMoveResolverARMVIXL : public ParallelMoveResolverWithSwap { public: ParallelMoveResolverARMVIXL(ArenaAllocator* allocator, CodeGeneratorARMVIXL* codegen) : ParallelMoveResolverWithSwap(allocator), codegen_(codegen) {} void EmitMove(size_t index) override; void EmitSwap(size_t index) override; void SpillScratch(int reg) override; void RestoreScratch(int reg) override; ArmVIXLAssembler* GetAssembler() const; private: void Exchange(vixl32::Register reg, int mem); void Exchange(int mem1, int mem2); CodeGeneratorARMVIXL* const codegen_; DISALLOW_COPY_AND_ASSIGN(ParallelMoveResolverARMVIXL); }; class LocationsBuilderARMVIXL : public HGraphVisitor { public: LocationsBuilderARMVIXL(HGraph* graph, CodeGeneratorARMVIXL* codegen) : HGraphVisitor(graph), codegen_(codegen) {} #define DECLARE_VISIT_INSTRUCTION(name, super) \ void Visit##name(H##name* instr) override; FOR_EACH_CONCRETE_INSTRUCTION_COMMON(DECLARE_VISIT_INSTRUCTION) FOR_EACH_CONCRETE_INSTRUCTION_ARM(DECLARE_VISIT_INSTRUCTION) FOR_EACH_CONCRETE_INSTRUCTION_SHARED(DECLARE_VISIT_INSTRUCTION) #undef DECLARE_VISIT_INSTRUCTION void VisitInstruction(HInstruction* instruction) override { LOG(FATAL) << "Unreachable instruction " << instruction->DebugName() << " (id " << instruction->GetId() << ")"; } private: void HandleInvoke(HInvoke* invoke); void HandleBitwiseOperation(HBinaryOperation* operation, Opcode opcode); void HandleCondition(HCondition* condition); void HandleIntegerRotate(LocationSummary* locations); void HandleLongRotate(LocationSummary* locations); void HandleShift(HBinaryOperation* operation); void HandleFieldSet(HInstruction* instruction, const FieldInfo& field_info); void HandleFieldGet(HInstruction* instruction, const FieldInfo& field_info); Location ArithmeticZeroOrFpuRegister(HInstruction* input); Location ArmEncodableConstantOrRegister(HInstruction* constant, Opcode opcode); bool CanEncodeConstantAsImmediate(HConstant* input_cst, Opcode opcode); CodeGeneratorARMVIXL* const codegen_; InvokeDexCallingConventionVisitorARMVIXL parameter_visitor_; DISALLOW_COPY_AND_ASSIGN(LocationsBuilderARMVIXL); }; class InstructionCodeGeneratorARMVIXL : public InstructionCodeGenerator { public: InstructionCodeGeneratorARMVIXL(HGraph* graph, CodeGeneratorARMVIXL* codegen); #define DECLARE_VISIT_INSTRUCTION(name, super) \ void Visit##name(H##name* instr) override; FOR_EACH_CONCRETE_INSTRUCTION_COMMON(DECLARE_VISIT_INSTRUCTION) FOR_EACH_CONCRETE_INSTRUCTION_ARM(DECLARE_VISIT_INSTRUCTION) FOR_EACH_CONCRETE_INSTRUCTION_SHARED(DECLARE_VISIT_INSTRUCTION) #undef DECLARE_VISIT_INSTRUCTION void VisitInstruction(HInstruction* instruction) override { LOG(FATAL) << "Unreachable instruction " << instruction->DebugName() << " (id " << instruction->GetId() << ")"; } ArmVIXLAssembler* GetAssembler() const { return assembler_; } ArmVIXLMacroAssembler* GetVIXLAssembler() { return GetAssembler()->GetVIXLAssembler(); } private: // Generate code for the given suspend check. If not null, `successor` // is the block to branch to if the suspend check is not needed, and after // the suspend call. void GenerateSuspendCheck(HSuspendCheck* instruction, HBasicBlock* successor); void GenerateClassInitializationCheck(LoadClassSlowPathARMVIXL* slow_path, vixl32::Register class_reg); void GenerateBitstringTypeCheckCompare(HTypeCheckInstruction* check, vixl::aarch32::Register temp, vixl::aarch32::FlagsUpdate flags_update); void GenerateAndConst(vixl::aarch32::Register out, vixl::aarch32::Register first, uint32_t value); void GenerateOrrConst(vixl::aarch32::Register out, vixl::aarch32::Register first, uint32_t value); void GenerateEorConst(vixl::aarch32::Register out, vixl::aarch32::Register first, uint32_t value); void GenerateAddLongConst(Location out, Location first, uint64_t value); void HandleBitwiseOperation(HBinaryOperation* operation); void HandleCondition(HCondition* condition); void HandleIntegerRotate(HRor* ror); void HandleLongRotate(HRor* ror); void HandleShift(HBinaryOperation* operation); void GenerateWideAtomicStore(vixl::aarch32::Register addr, uint32_t offset, vixl::aarch32::Register value_lo, vixl::aarch32::Register value_hi, vixl::aarch32::Register temp1, vixl::aarch32::Register temp2, HInstruction* instruction); void GenerateWideAtomicLoad(vixl::aarch32::Register addr, uint32_t offset, vixl::aarch32::Register out_lo, vixl::aarch32::Register out_hi); void HandleFieldSet(HInstruction* instruction, const FieldInfo& field_info, bool value_can_be_null); void HandleFieldGet(HInstruction* instruction, const FieldInfo& field_info); void GenerateMinMaxInt(LocationSummary* locations, bool is_min); void GenerateMinMaxLong(LocationSummary* locations, bool is_min); void GenerateMinMaxFloat(HInstruction* minmax, bool is_min); void GenerateMinMaxDouble(HInstruction* minmax, bool is_min); void GenerateMinMax(HBinaryOperation* minmax, bool is_min); // Generate a heap reference load using one register `out`: // // out <- *(out + offset) // // while honoring heap poisoning and/or read barriers (if any). // // Location `maybe_temp` is used when generating a read barrier and // shall be a register in that case; it may be an invalid location // otherwise. void GenerateReferenceLoadOneRegister(HInstruction* instruction, Location out, uint32_t offset, Location maybe_temp, ReadBarrierOption read_barrier_option); // Generate a heap reference load using two different registers // `out` and `obj`: // // out <- *(obj + offset) // // while honoring heap poisoning and/or read barriers (if any). // // Location `maybe_temp` is used when generating a Baker's (fast // path) read barrier and shall be a register in that case; it may // be an invalid location otherwise. void GenerateReferenceLoadTwoRegisters(HInstruction* instruction, Location out, Location obj, uint32_t offset, Location maybe_temp, ReadBarrierOption read_barrier_option); void GenerateTestAndBranch(HInstruction* instruction, size_t condition_input_index, vixl::aarch32::Label* true_target, vixl::aarch32::Label* false_target, bool far_target = true); void GenerateCompareTestAndBranch(HCondition* condition, vixl::aarch32::Label* true_target, vixl::aarch32::Label* false_target, bool is_far_target = true); void DivRemOneOrMinusOne(HBinaryOperation* instruction); void DivRemByPowerOfTwo(HBinaryOperation* instruction); void GenerateDivRemWithAnyConstant(HBinaryOperation* instruction); void GenerateDivRemConstantIntegral(HBinaryOperation* instruction); void HandleGoto(HInstruction* got, HBasicBlock* successor); vixl::aarch32::MemOperand VecAddress( HVecMemoryOperation* instruction, // This function may acquire a scratch register. vixl::aarch32::UseScratchRegisterScope* temps_scope, /*out*/ vixl32::Register* scratch); vixl::aarch32::AlignedMemOperand VecAddressUnaligned( HVecMemoryOperation* instruction, // This function may acquire a scratch register. vixl::aarch32::UseScratchRegisterScope* temps_scope, /*out*/ vixl32::Register* scratch); ArmVIXLAssembler* const assembler_; CodeGeneratorARMVIXL* const codegen_; DISALLOW_COPY_AND_ASSIGN(InstructionCodeGeneratorARMVIXL); }; class CodeGeneratorARMVIXL : public CodeGenerator { public: CodeGeneratorARMVIXL(HGraph* graph, const CompilerOptions& compiler_options, OptimizingCompilerStats* stats = nullptr); virtual ~CodeGeneratorARMVIXL() {} void GenerateFrameEntry() override; void GenerateFrameExit() override; void Bind(HBasicBlock* block) override; void MoveConstant(Location destination, int32_t value) override; void MoveLocation(Location dst, Location src, DataType::Type dst_type) override; void AddLocationAsTemp(Location location, LocationSummary* locations) override; size_t SaveCoreRegister(size_t stack_index, uint32_t reg_id) override; size_t RestoreCoreRegister(size_t stack_index, uint32_t reg_id) override; size_t SaveFloatingPointRegister(size_t stack_index, uint32_t reg_id) override; size_t RestoreFloatingPointRegister(size_t stack_index, uint32_t reg_id) override; size_t GetWordSize() const override { return static_cast(kArmPointerSize); } size_t GetCalleePreservedFPWidth() const override { return vixl::aarch32::kSRegSizeInBytes; } size_t GetSIMDRegisterWidth() const override { // ARM 32-bit backend doesn't support Q registers in vectorizer, only D // registers (due to register allocator restrictions: overlapping s/d/q // registers). return vixl::aarch32::kDRegSizeInBytes; } HGraphVisitor* GetLocationBuilder() override { return &location_builder_; } HGraphVisitor* GetInstructionVisitor() override { return &instruction_visitor_; } ArmVIXLAssembler* GetAssembler() override { return &assembler_; } const ArmVIXLAssembler& GetAssembler() const override { return assembler_; } ArmVIXLMacroAssembler* GetVIXLAssembler() { return GetAssembler()->GetVIXLAssembler(); } uintptr_t GetAddressOf(HBasicBlock* block) override { vixl::aarch32::Label* block_entry_label = GetLabelOf(block); DCHECK(block_entry_label->IsBound()); return block_entry_label->GetLocation(); } void FixJumpTables(); void SetupBlockedRegisters() const override; void DumpCoreRegister(std::ostream& stream, int reg) const override; void DumpFloatingPointRegister(std::ostream& stream, int reg) const override; ParallelMoveResolver* GetMoveResolver() override { return &move_resolver_; } InstructionSet GetInstructionSet() const override { return InstructionSet::kThumb2; } const ArmInstructionSetFeatures& GetInstructionSetFeatures() const; // Helper method to move a 32-bit value between two locations. void Move32(Location destination, Location source); void LoadFromShiftedRegOffset(DataType::Type type, Location out_loc, vixl::aarch32::Register base, vixl::aarch32::Register reg_index, vixl::aarch32::Condition cond = vixl::aarch32::al); void StoreToShiftedRegOffset(DataType::Type type, Location out_loc, vixl::aarch32::Register base, vixl::aarch32::Register reg_index, vixl::aarch32::Condition cond = vixl::aarch32::al); // Generate code to invoke a runtime entry point. void InvokeRuntime(QuickEntrypointEnum entrypoint, HInstruction* instruction, uint32_t dex_pc, SlowPathCode* slow_path = nullptr) override; // Generate code to invoke a runtime entry point, but do not record // PC-related information in a stack map. void InvokeRuntimeWithoutRecordingPcInfo(int32_t entry_point_offset, HInstruction* instruction, SlowPathCode* slow_path); // Emit a write barrier. void MarkGCCard(vixl::aarch32::Register temp, vixl::aarch32::Register card, vixl::aarch32::Register object, vixl::aarch32::Register value, bool can_be_null); void GenerateMemoryBarrier(MemBarrierKind kind); vixl::aarch32::Label* GetLabelOf(HBasicBlock* block) { block = FirstNonEmptyBlock(block); return &(block_labels_[block->GetBlockId()]); } vixl32::Label* GetFinalLabel(HInstruction* instruction, vixl32::Label* final_label); void Initialize() override { block_labels_.resize(GetGraph()->GetBlocks().size()); } void Finalize(CodeAllocator* allocator) override; bool NeedsTwoRegisters(DataType::Type type) const override { return type == DataType::Type::kFloat64 || type == DataType::Type::kInt64; } void ComputeSpillMask() override; vixl::aarch32::Label* GetFrameEntryLabel() { return &frame_entry_label_; } // Check if the desired_string_load_kind is supported. If it is, return it, // otherwise return a fall-back kind that should be used instead. HLoadString::LoadKind GetSupportedLoadStringKind( HLoadString::LoadKind desired_string_load_kind) override; // Check if the desired_class_load_kind is supported. If it is, return it, // otherwise return a fall-back kind that should be used instead. HLoadClass::LoadKind GetSupportedLoadClassKind( HLoadClass::LoadKind desired_class_load_kind) override; // Check if the desired_dispatch_info is supported. If it is, return it, // otherwise return a fall-back info that should be used instead. HInvokeStaticOrDirect::DispatchInfo GetSupportedInvokeStaticOrDirectDispatch( const HInvokeStaticOrDirect::DispatchInfo& desired_dispatch_info, ArtMethod* method) override; void GenerateStaticOrDirectCall( HInvokeStaticOrDirect* invoke, Location temp, SlowPathCode* slow_path = nullptr) override; void GenerateVirtualCall( HInvokeVirtual* invoke, Location temp, SlowPathCode* slow_path = nullptr) override; void MoveFromReturnRegister(Location trg, DataType::Type type) override; // The PcRelativePatchInfo is used for PC-relative addressing of methods/strings/types, // whether through .data.bimg.rel.ro, .bss, or directly in the boot image. // // The PC-relative address is loaded with three instructions, // MOVW+MOVT to load the offset to base_reg and then ADD base_reg, PC. The offset // is calculated from the ADD's effective PC, i.e. PC+4 on Thumb2. Though we // currently emit these 3 instructions together, instruction scheduling could // split this sequence apart, so we keep separate labels for each of them. struct PcRelativePatchInfo { PcRelativePatchInfo(const DexFile* dex_file, uint32_t off_or_idx) : target_dex_file(dex_file), offset_or_index(off_or_idx) { } PcRelativePatchInfo(PcRelativePatchInfo&& other) = default; // Target dex file or null for .data.bmig.rel.ro patches. const DexFile* target_dex_file; // Either the boot image offset (to write to .data.bmig.rel.ro) or string/type/method index. uint32_t offset_or_index; vixl::aarch32::Label movw_label; vixl::aarch32::Label movt_label; vixl::aarch32::Label add_pc_label; }; PcRelativePatchInfo* NewBootImageIntrinsicPatch(uint32_t intrinsic_data); PcRelativePatchInfo* NewBootImageRelRoPatch(uint32_t boot_image_offset); PcRelativePatchInfo* NewBootImageMethodPatch(MethodReference target_method); PcRelativePatchInfo* NewMethodBssEntryPatch(MethodReference target_method); PcRelativePatchInfo* NewBootImageTypePatch(const DexFile& dex_file, dex::TypeIndex type_index); PcRelativePatchInfo* NewTypeBssEntryPatch(const DexFile& dex_file, dex::TypeIndex type_index); PcRelativePatchInfo* NewBootImageStringPatch(const DexFile& dex_file, dex::StringIndex string_index); PcRelativePatchInfo* NewStringBssEntryPatch(const DexFile& dex_file, dex::StringIndex string_index); // Emit the BL instruction for entrypoint thunk call and record the associated patch for AOT. void EmitEntrypointThunkCall(ThreadOffset32 entrypoint_offset); // Emit the BNE instruction for baker read barrier and record // the associated patch for AOT or slow path for JIT. void EmitBakerReadBarrierBne(uint32_t custom_data); VIXLUInt32Literal* DeduplicateBootImageAddressLiteral(uint32_t address); VIXLUInt32Literal* DeduplicateJitStringLiteral(const DexFile& dex_file, dex::StringIndex string_index, Handle handle); VIXLUInt32Literal* DeduplicateJitClassLiteral(const DexFile& dex_file, dex::TypeIndex type_index, Handle handle); void LoadBootImageAddress(vixl::aarch32::Register reg, uint32_t boot_image_reference); void AllocateInstanceForIntrinsic(HInvokeStaticOrDirect* invoke, uint32_t boot_image_offset); void EmitLinkerPatches(ArenaVector* linker_patches) override; bool NeedsThunkCode(const linker::LinkerPatch& patch) const override; void EmitThunkCode(const linker::LinkerPatch& patch, /*out*/ ArenaVector* code, /*out*/ std::string* debug_name) override; void EmitJitRootPatches(uint8_t* code, const uint8_t* roots_data) override; // Generate a GC root reference load: // // root <- *(obj + offset) // // while honoring read barriers based on read_barrier_option. void GenerateGcRootFieldLoad(HInstruction* instruction, Location root, vixl::aarch32::Register obj, uint32_t offset, ReadBarrierOption read_barrier_option); // Generate ADD for UnsafeCASObject to reconstruct the old value from // `old_value - expected` and mark it with Baker read barrier. void GenerateUnsafeCasOldValueAddWithBakerReadBarrier(vixl::aarch32::Register old_value, vixl::aarch32::Register adjusted_old_value, vixl::aarch32::Register expected); // Fast path implementation of ReadBarrier::Barrier for a heap // reference field load when Baker's read barriers are used. // Overload suitable for Unsafe.getObject/-Volatile() intrinsic. void GenerateFieldLoadWithBakerReadBarrier(HInstruction* instruction, Location ref, vixl::aarch32::Register obj, const vixl::aarch32::MemOperand& src, bool needs_null_check); // Fast path implementation of ReadBarrier::Barrier for a heap // reference field load when Baker's read barriers are used. void GenerateFieldLoadWithBakerReadBarrier(HInstruction* instruction, Location ref, vixl::aarch32::Register obj, uint32_t offset, Location temp, bool needs_null_check); // Fast path implementation of ReadBarrier::Barrier for a heap // reference array load when Baker's read barriers are used. void GenerateArrayLoadWithBakerReadBarrier(Location ref, vixl::aarch32::Register obj, uint32_t data_offset, Location index, Location temp, bool needs_null_check); // Emit code checking the status of the Marking Register, and // aborting the program if MR does not match the value stored in the // art::Thread object. Code is only emitted in debug mode and if // CompilerOptions::EmitRunTimeChecksInDebugMode returns true. // // Argument `code` is used to identify the different occurrences of // MaybeGenerateMarkingRegisterCheck in the code generator, and is // used together with kMarkingRegisterCheckBreakCodeBaseCode to // create the value passed to the BKPT instruction. Note that unlike // in the ARM64 code generator, where `__LINE__` is passed as `code` // argument to // CodeGeneratorARM64::MaybeGenerateMarkingRegisterCheck, we cannot // realistically do that here, as Encoding T1 for the BKPT // instruction only accepts 8-bit immediate values. // // If `temp_loc` is a valid location, it is expected to be a // register and will be used as a temporary to generate code; // otherwise, a temporary will be fetched from the core register // scratch pool. virtual void MaybeGenerateMarkingRegisterCheck(int code, Location temp_loc = Location::NoLocation()); // Generate a read barrier for a heap reference within `instruction` // using a slow path. // // A read barrier for an object reference read from the heap is // implemented as a call to the artReadBarrierSlow runtime entry // point, which is passed the values in locations `ref`, `obj`, and // `offset`: // // mirror::Object* artReadBarrierSlow(mirror::Object* ref, // mirror::Object* obj, // uint32_t offset); // // The `out` location contains the value returned by // artReadBarrierSlow. // // When `index` is provided (i.e. for array accesses), the offset // value passed to artReadBarrierSlow is adjusted to take `index` // into account. void GenerateReadBarrierSlow(HInstruction* instruction, Location out, Location ref, Location obj, uint32_t offset, Location index = Location::NoLocation()); // If read barriers are enabled, generate a read barrier for a heap // reference using a slow path. If heap poisoning is enabled, also // unpoison the reference in `out`. void MaybeGenerateReadBarrierSlow(HInstruction* instruction, Location out, Location ref, Location obj, uint32_t offset, Location index = Location::NoLocation()); // Generate a read barrier for a GC root within `instruction` using // a slow path. // // A read barrier for an object reference GC root is implemented as // a call to the artReadBarrierForRootSlow runtime entry point, // which is passed the value in location `root`: // // mirror::Object* artReadBarrierForRootSlow(GcRoot* root); // // The `out` location contains the value returned by // artReadBarrierForRootSlow. void GenerateReadBarrierForRootSlow(HInstruction* instruction, Location out, Location root); void IncreaseFrame(size_t adjustment) override; void DecreaseFrame(size_t adjustment) override; void GenerateNop() override; void GenerateImplicitNullCheck(HNullCheck* instruction) override; void GenerateExplicitNullCheck(HNullCheck* instruction) override; JumpTableARMVIXL* CreateJumpTable(HPackedSwitch* switch_instr) { jump_tables_.emplace_back(new (GetGraph()->GetAllocator()) JumpTableARMVIXL(switch_instr)); return jump_tables_.back().get(); } void EmitJumpTables(); void EmitMovwMovtPlaceholder(CodeGeneratorARMVIXL::PcRelativePatchInfo* labels, vixl::aarch32::Register out); // `temp` is an extra temporary register that is used for some conditions; // callers may not specify it, in which case the method will use a scratch // register instead. void GenerateConditionWithZero(IfCondition condition, vixl::aarch32::Register out, vixl::aarch32::Register in, vixl::aarch32::Register temp = vixl32::Register()); void MaybeRecordImplicitNullCheck(HInstruction* instr) final { // The function must be only be called within special scopes // (EmissionCheckScope, ExactAssemblyScope) which prevent generation of // veneer/literal pools by VIXL assembler. CHECK_EQ(GetVIXLAssembler()->ArePoolsBlocked(), true) << "The function must only be called within EmissionCheckScope or ExactAssemblyScope"; CodeGenerator::MaybeRecordImplicitNullCheck(instr); } void MaybeGenerateInlineCacheCheck(HInstruction* instruction, vixl32::Register klass); void MaybeIncrementHotness(bool is_frame_entry); private: // Encoding of thunk type and data for link-time generated thunks for Baker read barriers. enum class BakerReadBarrierKind : uint8_t { kField, // Field get or array get with constant offset (i.e. constant index). kArray, // Array get with index in register. kGcRoot, // GC root load. kUnsafeCas, // UnsafeCASObject intrinsic. kLast = kUnsafeCas }; enum class BakerReadBarrierWidth : uint8_t { kWide, // 32-bit LDR (and 32-bit NEG if heap poisoning is enabled). kNarrow, // 16-bit LDR (and 16-bit NEG if heap poisoning is enabled). kLast = kNarrow }; static constexpr uint32_t kBakerReadBarrierInvalidEncodedReg = /* pc is invalid */ 15u; static constexpr size_t kBitsForBakerReadBarrierKind = MinimumBitsToStore(static_cast(BakerReadBarrierKind::kLast)); static constexpr size_t kBakerReadBarrierBitsForRegister = MinimumBitsToStore(kBakerReadBarrierInvalidEncodedReg); using BakerReadBarrierKindField = BitField; using BakerReadBarrierFirstRegField = BitField; using BakerReadBarrierSecondRegField = BitField; static constexpr size_t kBitsForBakerReadBarrierWidth = MinimumBitsToStore(static_cast(BakerReadBarrierWidth::kLast)); using BakerReadBarrierWidthField = BitField; static void CheckValidReg(uint32_t reg) { DCHECK(reg < vixl::aarch32::ip.GetCode() && reg != mr.GetCode()) << reg; } static uint32_t EncodeBakerReadBarrierFieldData(uint32_t base_reg, uint32_t holder_reg, bool narrow) { CheckValidReg(base_reg); CheckValidReg(holder_reg); DCHECK(!narrow || base_reg < 8u) << base_reg; BakerReadBarrierWidth width = narrow ? BakerReadBarrierWidth::kNarrow : BakerReadBarrierWidth::kWide; return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kField) | BakerReadBarrierFirstRegField::Encode(base_reg) | BakerReadBarrierSecondRegField::Encode(holder_reg) | BakerReadBarrierWidthField::Encode(width); } static uint32_t EncodeBakerReadBarrierArrayData(uint32_t base_reg) { CheckValidReg(base_reg); return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kArray) | BakerReadBarrierFirstRegField::Encode(base_reg) | BakerReadBarrierSecondRegField::Encode(kBakerReadBarrierInvalidEncodedReg) | BakerReadBarrierWidthField::Encode(BakerReadBarrierWidth::kWide); } static uint32_t EncodeBakerReadBarrierGcRootData(uint32_t root_reg, bool narrow) { CheckValidReg(root_reg); DCHECK(!narrow || root_reg < 8u) << root_reg; BakerReadBarrierWidth width = narrow ? BakerReadBarrierWidth::kNarrow : BakerReadBarrierWidth::kWide; return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kGcRoot) | BakerReadBarrierFirstRegField::Encode(root_reg) | BakerReadBarrierSecondRegField::Encode(kBakerReadBarrierInvalidEncodedReg) | BakerReadBarrierWidthField::Encode(width); } static uint32_t EncodeBakerReadBarrierUnsafeCasData(uint32_t root_reg) { CheckValidReg(root_reg); return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kUnsafeCas) | BakerReadBarrierFirstRegField::Encode(root_reg) | BakerReadBarrierSecondRegField::Encode(kBakerReadBarrierInvalidEncodedReg) | BakerReadBarrierWidthField::Encode(BakerReadBarrierWidth::kWide); } void CompileBakerReadBarrierThunk(ArmVIXLAssembler& assembler, uint32_t encoded_data, /*out*/ std::string* debug_name); using Uint32ToLiteralMap = ArenaSafeMap; using StringToLiteralMap = ArenaSafeMap; using TypeToLiteralMap = ArenaSafeMap; struct BakerReadBarrierPatchInfo { explicit BakerReadBarrierPatchInfo(uint32_t data) : label(), custom_data(data) { } vixl::aarch32::Label label; uint32_t custom_data; }; VIXLUInt32Literal* DeduplicateUint32Literal(uint32_t value, Uint32ToLiteralMap* map); PcRelativePatchInfo* NewPcRelativePatch(const DexFile* dex_file, uint32_t offset_or_index, ArenaDeque* patches); template static void EmitPcRelativeLinkerPatches(const ArenaDeque& infos, ArenaVector* linker_patches); // Labels for each block that will be compiled. // We use a deque so that the `vixl::aarch32::Label` objects do not move in memory. ArenaDeque block_labels_; // Indexed by block id. vixl::aarch32::Label frame_entry_label_; ArenaVector> jump_tables_; LocationsBuilderARMVIXL location_builder_; InstructionCodeGeneratorARMVIXL instruction_visitor_; ParallelMoveResolverARMVIXL move_resolver_; ArmVIXLAssembler assembler_; // PC-relative method patch info for kBootImageLinkTimePcRelative. ArenaDeque boot_image_method_patches_; // PC-relative method patch info for kBssEntry. ArenaDeque method_bss_entry_patches_; // PC-relative type patch info for kBootImageLinkTimePcRelative. ArenaDeque boot_image_type_patches_; // PC-relative type patch info for kBssEntry. ArenaDeque type_bss_entry_patches_; // PC-relative String patch info for kBootImageLinkTimePcRelative. ArenaDeque boot_image_string_patches_; // PC-relative String patch info for kBssEntry. ArenaDeque string_bss_entry_patches_; // PC-relative patch info for IntrinsicObjects for the boot image, // and for method/type/string patches for kBootImageRelRo otherwise. ArenaDeque boot_image_other_patches_; // Patch info for calls to entrypoint dispatch thunks. Used for slow paths. ArenaDeque> call_entrypoint_patches_; // Baker read barrier patch info. ArenaDeque baker_read_barrier_patches_; // Deduplication map for 32-bit literals, used for JIT for boot image addresses. Uint32ToLiteralMap uint32_literals_; // Patches for string literals in JIT compiled code. StringToLiteralMap jit_string_patches_; // Patches for class literals in JIT compiled code. TypeToLiteralMap jit_class_patches_; // Baker read barrier slow paths, mapping custom data (uint32_t) to label. // Wrap the label to work around vixl::aarch32::Label being non-copyable // and non-moveable and as such unusable in ArenaSafeMap<>. struct LabelWrapper { LabelWrapper(const LabelWrapper& src) : label() { DCHECK(!src.label.IsReferenced() && !src.label.IsBound()); } LabelWrapper() = default; vixl::aarch32::Label label; }; ArenaSafeMap jit_baker_read_barrier_slow_paths_; friend class linker::Thumb2RelativePatcherTest; DISALLOW_COPY_AND_ASSIGN(CodeGeneratorARMVIXL); }; } // namespace arm } // namespace art #endif // ART_COMPILER_OPTIMIZING_CODE_GENERATOR_ARM_VIXL_H_