| // Copyright (c) 2013, 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. |
| |
| #include "vm/globals.h" // Needed here to get TARGET_ARCH_ARM. |
| #if defined(TARGET_ARCH_ARM) |
| |
| #include "vm/compiler/backend/flow_graph_compiler.h" |
| |
| #include "vm/compiler/api/type_check_mode.h" |
| #include "vm/compiler/backend/il_printer.h" |
| #include "vm/compiler/backend/locations.h" |
| #include "vm/compiler/jit/compiler.h" |
| #include "vm/cpu.h" |
| #include "vm/dart_entry.h" |
| #include "vm/deopt_instructions.h" |
| #include "vm/dispatch_table.h" |
| #include "vm/instructions.h" |
| #include "vm/object_store.h" |
| #include "vm/parser.h" |
| #include "vm/stack_frame.h" |
| #include "vm/stub_code.h" |
| #include "vm/symbols.h" |
| |
| namespace dart { |
| |
| DEFINE_FLAG(bool, trap_on_deoptimization, false, "Trap on deoptimization."); |
| DEFINE_FLAG(bool, unbox_mints, true, "Optimize 64-bit integer arithmetic."); |
| DEFINE_FLAG(bool, unbox_doubles, true, "Optimize double arithmetic."); |
| DECLARE_FLAG(bool, enable_simd_inline); |
| |
| void FlowGraphCompiler::ArchSpecificInitialization() { |
| if (FLAG_precompiled_mode && FLAG_use_bare_instructions) { |
| auto object_store = isolate_group()->object_store(); |
| |
| const auto& stub = |
| Code::ZoneHandle(object_store->write_barrier_wrappers_stub()); |
| if (CanPcRelativeCall(stub)) { |
| assembler_->generate_invoke_write_barrier_wrapper_ = |
| [&](Condition condition, Register reg) { |
| const intptr_t offset_into_target = |
| Thread::WriteBarrierWrappersOffsetForRegister(reg); |
| assembler_->GenerateUnRelocatedPcRelativeCall(condition, |
| offset_into_target); |
| AddPcRelativeCallStubTarget(stub); |
| }; |
| } |
| |
| const auto& array_stub = |
| Code::ZoneHandle(object_store->array_write_barrier_stub()); |
| if (CanPcRelativeCall(stub)) { |
| assembler_->generate_invoke_array_write_barrier_ = |
| [&](Condition condition) { |
| assembler_->GenerateUnRelocatedPcRelativeCall(condition); |
| AddPcRelativeCallStubTarget(array_stub); |
| }; |
| } |
| } |
| } |
| |
| FlowGraphCompiler::~FlowGraphCompiler() { |
| // BlockInfos are zone-allocated, so their destructors are not called. |
| // Verify the labels explicitly here. |
| for (int i = 0; i < block_info_.length(); ++i) { |
| ASSERT(!block_info_[i]->jump_label()->IsLinked()); |
| } |
| } |
| |
| bool FlowGraphCompiler::SupportsUnboxedDoubles() { |
| return TargetCPUFeatures::vfp_supported() && FLAG_unbox_doubles; |
| } |
| |
| bool FlowGraphCompiler::SupportsUnboxedInt64() { |
| return FLAG_unbox_mints; |
| } |
| |
| bool FlowGraphCompiler::SupportsUnboxedSimd128() { |
| return TargetCPUFeatures::neon_supported() && FLAG_enable_simd_inline; |
| } |
| |
| bool FlowGraphCompiler::SupportsHardwareDivision() { |
| return TargetCPUFeatures::can_divide(); |
| } |
| |
| bool FlowGraphCompiler::CanConvertInt64ToDouble() { |
| // ARM does not have a short instruction sequence for converting int64 to |
| // double. |
| return false; |
| } |
| |
| void FlowGraphCompiler::EnterIntrinsicMode() { |
| ASSERT(!intrinsic_mode()); |
| intrinsic_mode_ = true; |
| ASSERT(!assembler()->constant_pool_allowed()); |
| } |
| |
| void FlowGraphCompiler::ExitIntrinsicMode() { |
| ASSERT(intrinsic_mode()); |
| intrinsic_mode_ = false; |
| } |
| |
| TypedDataPtr CompilerDeoptInfo::CreateDeoptInfo(FlowGraphCompiler* compiler, |
| DeoptInfoBuilder* builder, |
| const Array& deopt_table) { |
| if (deopt_env_ == NULL) { |
| ++builder->current_info_number_; |
| return TypedData::null(); |
| } |
| |
| intptr_t stack_height = compiler->StackSize(); |
| AllocateIncomingParametersRecursive(deopt_env_, &stack_height); |
| |
| intptr_t slot_ix = 0; |
| Environment* current = deopt_env_; |
| |
| // Emit all kMaterializeObject instructions describing objects to be |
| // materialized on the deoptimization as a prefix to the deoptimization info. |
| EmitMaterializations(deopt_env_, builder); |
| |
| // The real frame starts here. |
| builder->MarkFrameStart(); |
| |
| Zone* zone = compiler->zone(); |
| |
| builder->AddPp(current->function(), slot_ix++); |
| builder->AddPcMarker(Function::ZoneHandle(zone), slot_ix++); |
| builder->AddCallerFp(slot_ix++); |
| builder->AddReturnAddress(current->function(), deopt_id(), slot_ix++); |
| |
| // Emit all values that are needed for materialization as a part of the |
| // expression stack for the bottom-most frame. This guarantees that GC |
| // will be able to find them during materialization. |
| slot_ix = builder->EmitMaterializationArguments(slot_ix); |
| |
| // For the innermost environment, set outgoing arguments and the locals. |
| for (intptr_t i = current->Length() - 1; |
| i >= current->fixed_parameter_count(); i--) { |
| builder->AddCopy(current->ValueAt(i), current->LocationAt(i), slot_ix++); |
| } |
| |
| Environment* previous = current; |
| current = current->outer(); |
| while (current != NULL) { |
| builder->AddPp(current->function(), slot_ix++); |
| builder->AddPcMarker(previous->function(), slot_ix++); |
| builder->AddCallerFp(slot_ix++); |
| |
| // For any outer environment the deopt id is that of the call instruction |
| // which is recorded in the outer environment. |
| builder->AddReturnAddress(current->function(), |
| DeoptId::ToDeoptAfter(current->deopt_id()), |
| slot_ix++); |
| |
| // The values of outgoing arguments can be changed from the inlined call so |
| // we must read them from the previous environment. |
| for (intptr_t i = previous->fixed_parameter_count() - 1; i >= 0; i--) { |
| builder->AddCopy(previous->ValueAt(i), previous->LocationAt(i), |
| slot_ix++); |
| } |
| |
| // Set the locals, note that outgoing arguments are not in the environment. |
| for (intptr_t i = current->Length() - 1; |
| i >= current->fixed_parameter_count(); i--) { |
| builder->AddCopy(current->ValueAt(i), current->LocationAt(i), slot_ix++); |
| } |
| |
| // Iterate on the outer environment. |
| previous = current; |
| current = current->outer(); |
| } |
| // The previous pointer is now the outermost environment. |
| ASSERT(previous != NULL); |
| |
| // Set slots for the outermost environment. |
| builder->AddCallerPp(slot_ix++); |
| builder->AddPcMarker(previous->function(), slot_ix++); |
| builder->AddCallerFp(slot_ix++); |
| builder->AddCallerPc(slot_ix++); |
| |
| // For the outermost environment, set the incoming arguments. |
| for (intptr_t i = previous->fixed_parameter_count() - 1; i >= 0; i--) { |
| builder->AddCopy(previous->ValueAt(i), previous->LocationAt(i), slot_ix++); |
| } |
| |
| return builder->CreateDeoptInfo(deopt_table); |
| } |
| |
| void CompilerDeoptInfoWithStub::GenerateCode(FlowGraphCompiler* compiler, |
| intptr_t stub_ix) { |
| // Calls do not need stubs, they share a deoptimization trampoline. |
| ASSERT(reason() != ICData::kDeoptAtCall); |
| compiler::Assembler* assembler = compiler->assembler(); |
| #define __ assembler-> |
| __ Comment("%s", Name()); |
| __ Bind(entry_label()); |
| if (FLAG_trap_on_deoptimization) { |
| __ bkpt(0); |
| } |
| |
| ASSERT(deopt_env() != NULL); |
| __ Call(compiler::Address( |
| THR, compiler::target::Thread::deoptimize_entry_offset())); |
| set_pc_offset(assembler->CodeSize()); |
| #undef __ |
| } |
| |
| #define __ assembler-> |
| // Static methods of FlowGraphCompiler that take an assembler. |
| |
| void FlowGraphCompiler::GenerateIndirectTTSCall(compiler::Assembler* assembler, |
| Register reg_to_call, |
| intptr_t sub_type_cache_index) { |
| __ LoadField( |
| TTSInternalRegs::kScratchReg, |
| compiler::FieldAddress( |
| reg_to_call, |
| compiler::target::AbstractType::type_test_stub_entry_point_offset())); |
| __ LoadWordFromPoolIndex(TypeTestABI::kSubtypeTestCacheReg, |
| sub_type_cache_index); |
| __ blx(TTSInternalRegs::kScratchReg); |
| } |
| |
| #undef __ |
| #define __ assembler()-> |
| // Instance methods of FlowGraphCompiler. |
| |
| // Fall through if bool_register contains null. |
| void FlowGraphCompiler::GenerateBoolToJump(Register bool_register, |
| compiler::Label* is_true, |
| compiler::Label* is_false) { |
| compiler::Label fall_through; |
| __ CompareObject(bool_register, Object::null_object()); |
| __ b(&fall_through, EQ); |
| BranchLabels labels = {is_true, is_false, &fall_through}; |
| Condition true_condition = |
| EmitBoolTest(bool_register, labels, /*invert=*/false); |
| ASSERT(true_condition != kInvalidCondition); |
| __ b(is_true, true_condition); |
| __ b(is_false); |
| __ Bind(&fall_through); |
| } |
| |
| void FlowGraphCompiler::EmitInstructionEpilogue(Instruction* instr) { |
| if (is_optimizing()) { |
| return; |
| } |
| Definition* defn = instr->AsDefinition(); |
| if ((defn != NULL) && defn->HasTemp()) { |
| __ Push(defn->locs()->out(0).reg()); |
| } |
| } |
| |
| void FlowGraphCompiler::GenerateMethodExtractorIntrinsic( |
| const Function& extracted_method, |
| intptr_t type_arguments_field_offset) { |
| // No frame has been setup here. |
| ASSERT(!__ constant_pool_allowed()); |
| ASSERT(extracted_method.IsZoneHandle()); |
| |
| const Code& build_method_extractor = Code::ZoneHandle( |
| isolate_group()->object_store()->build_method_extractor_code()); |
| |
| const intptr_t stub_index = __ object_pool_builder().AddObject( |
| build_method_extractor, ObjectPool::Patchability::kNotPatchable); |
| const intptr_t function_index = __ object_pool_builder().AddObject( |
| extracted_method, ObjectPool::Patchability::kNotPatchable); |
| |
| // We use a custom pool register to preserve caller PP. |
| Register kPoolReg = R0; |
| |
| // R1 = extracted function |
| // R4 = offset of type argument vector (or 0 if class is not generic) |
| if (FLAG_precompiled_mode && FLAG_use_bare_instructions) { |
| kPoolReg = PP; |
| } else { |
| __ LoadFieldFromOffset(kPoolReg, CODE_REG, |
| compiler::target::Code::object_pool_offset()); |
| } |
| __ LoadImmediate(R4, type_arguments_field_offset); |
| __ LoadFieldFromOffset( |
| R1, kPoolReg, |
| compiler::target::ObjectPool::element_offset(function_index)); |
| __ LoadFieldFromOffset( |
| CODE_REG, kPoolReg, |
| compiler::target::ObjectPool::element_offset(stub_index)); |
| __ Branch(compiler::FieldAddress( |
| CODE_REG, |
| compiler::target::Code::entry_point_offset(Code::EntryKind::kUnchecked))); |
| } |
| |
| void FlowGraphCompiler::EmitFrameEntry() { |
| const Function& function = parsed_function().function(); |
| if (CanOptimizeFunction() && function.IsOptimizable() && |
| (!is_optimizing() || may_reoptimize())) { |
| __ Comment("Invocation Count Check"); |
| const Register function_reg = R8; |
| __ ldr(function_reg, compiler::FieldAddress( |
| CODE_REG, compiler::target::Code::owner_offset())); |
| __ ldr(R3, compiler::FieldAddress( |
| function_reg, |
| compiler::target::Function::usage_counter_offset())); |
| // Reoptimization of an optimized function is triggered by counting in |
| // IC stubs, but not at the entry of the function. |
| if (!is_optimizing()) { |
| __ add(R3, R3, compiler::Operand(1)); |
| __ str(R3, compiler::FieldAddress( |
| function_reg, |
| compiler::target::Function::usage_counter_offset())); |
| } |
| __ CompareImmediate(R3, GetOptimizationThreshold()); |
| ASSERT(function_reg == R8); |
| __ Branch(compiler::Address( |
| THR, compiler::target::Thread::optimize_entry_offset()), |
| GE); |
| } |
| |
| if (flow_graph().graph_entry()->NeedsFrame()) { |
| __ Comment("Enter frame"); |
| if (flow_graph().IsCompiledForOsr()) { |
| const intptr_t extra_slots = ExtraStackSlotsOnOsrEntry(); |
| ASSERT(extra_slots >= 0); |
| __ EnterOsrFrame(extra_slots * compiler::target::kWordSize); |
| } else { |
| ASSERT(StackSize() >= 0); |
| __ EnterDartFrame(StackSize() * compiler::target::kWordSize); |
| } |
| } else if (FLAG_use_bare_instructions) { |
| assembler()->set_constant_pool_allowed(true); |
| } |
| } |
| |
| const InstructionSource& PrologueSource() { |
| static InstructionSource prologue_source(TokenPosition::kDartCodePrologue, |
| /*inlining_id=*/0); |
| return prologue_source; |
| } |
| |
| void FlowGraphCompiler::EmitPrologue() { |
| BeginCodeSourceRange(PrologueSource()); |
| |
| EmitFrameEntry(); |
| ASSERT(assembler()->constant_pool_allowed()); |
| |
| // In unoptimized code, initialize (non-argument) stack allocated slots. |
| if (!is_optimizing()) { |
| const int num_locals = parsed_function().num_stack_locals(); |
| |
| intptr_t args_desc_slot = -1; |
| if (parsed_function().has_arg_desc_var()) { |
| args_desc_slot = compiler::target::frame_layout.FrameSlotForVariable( |
| parsed_function().arg_desc_var()); |
| } |
| |
| __ Comment("Initialize spill slots"); |
| if (num_locals > 1 || (num_locals == 1 && args_desc_slot == -1)) { |
| __ LoadObject(R0, Object::null_object()); |
| } |
| for (intptr_t i = 0; i < num_locals; ++i) { |
| const intptr_t slot_index = |
| compiler::target::frame_layout.FrameSlotForVariableIndex(-i); |
| Register value_reg = slot_index == args_desc_slot ? ARGS_DESC_REG : R0; |
| __ StoreToOffset(value_reg, FP, slot_index * compiler::target::kWordSize); |
| } |
| } |
| |
| EndCodeSourceRange(PrologueSource()); |
| } |
| |
| // Input parameters: |
| // LR: return address. |
| // SP: address of last argument. |
| // FP: caller's frame pointer. |
| // PP: caller's pool pointer. |
| // R4: arguments descriptor array. |
| void FlowGraphCompiler::CompileGraph() { |
| InitCompiler(); |
| |
| // For JIT we have multiple entrypoints functionality which moved the frame |
| // setup into the [TargetEntryInstr] (which will set the constant pool |
| // allowed bit to true). Despite this we still have to set the |
| // constant pool allowed bit to true here as well, because we can generate |
| // code for [CatchEntryInstr]s, which need the pool. |
| __ set_constant_pool_allowed(true); |
| |
| VisitBlocks(); |
| |
| #if defined(DEBUG) |
| __ bkpt(0); |
| #endif |
| |
| if (!skip_body_compilation()) { |
| ASSERT(assembler()->constant_pool_allowed()); |
| GenerateDeferredCode(); |
| } |
| |
| for (intptr_t i = 0; i < indirect_gotos_.length(); ++i) { |
| indirect_gotos_[i]->ComputeOffsetTable(this); |
| } |
| } |
| |
| void FlowGraphCompiler::EmitCallToStub(const Code& stub) { |
| ASSERT(!stub.IsNull()); |
| if (CanPcRelativeCall(stub)) { |
| __ GenerateUnRelocatedPcRelativeCall(); |
| AddPcRelativeCallStubTarget(stub); |
| } else { |
| __ BranchLink(stub); |
| AddStubCallTarget(stub); |
| } |
| } |
| |
| void FlowGraphCompiler::EmitTailCallToStub(const Code& stub) { |
| ASSERT(!stub.IsNull()); |
| if (CanPcRelativeCall(stub)) { |
| __ LeaveDartFrame(); |
| __ GenerateUnRelocatedPcRelativeTailCall(); |
| AddPcRelativeTailCallStubTarget(stub); |
| #if defined(DEBUG) |
| __ Breakpoint(); |
| #endif |
| } else { |
| __ LoadObject(CODE_REG, stub); |
| __ LeaveDartFrame(); |
| __ ldr(PC, compiler::FieldAddress( |
| CODE_REG, compiler::target::Code::entry_point_offset())); |
| AddStubCallTarget(stub); |
| } |
| } |
| |
| void FlowGraphCompiler::GeneratePatchableCall(const InstructionSource& source, |
| const Code& stub, |
| UntaggedPcDescriptors::Kind kind, |
| LocationSummary* locs) { |
| __ BranchLinkPatchable(stub); |
| EmitCallsiteMetadata(source, DeoptId::kNone, kind, locs); |
| } |
| |
| void FlowGraphCompiler::GenerateDartCall(intptr_t deopt_id, |
| const InstructionSource& source, |
| const Code& stub, |
| UntaggedPcDescriptors::Kind kind, |
| LocationSummary* locs, |
| Code::EntryKind entry_kind) { |
| ASSERT(CanCallDart()); |
| __ BranchLinkPatchable(stub, entry_kind); |
| EmitCallsiteMetadata(source, deopt_id, kind, locs); |
| } |
| |
| void FlowGraphCompiler::GenerateStaticDartCall(intptr_t deopt_id, |
| const InstructionSource& source, |
| UntaggedPcDescriptors::Kind kind, |
| LocationSummary* locs, |
| const Function& target, |
| Code::EntryKind entry_kind) { |
| ASSERT(CanCallDart()); |
| if (CanPcRelativeCall(target)) { |
| __ GenerateUnRelocatedPcRelativeCall(); |
| AddPcRelativeCallTarget(target, entry_kind); |
| EmitCallsiteMetadata(source, deopt_id, kind, locs); |
| } else { |
| ASSERT(is_optimizing()); |
| // Call sites to the same target can share object pool entries. These |
| // call sites are never patched for breakpoints: the function is deoptimized |
| // and the unoptimized code with IC calls for static calls is patched |
| // instead. |
| const auto& stub = StubCode::CallStaticFunction(); |
| __ BranchLinkWithEquivalence(stub, target, entry_kind); |
| EmitCallsiteMetadata(source, deopt_id, kind, locs); |
| AddStaticCallTarget(target, entry_kind); |
| } |
| } |
| |
| void FlowGraphCompiler::GenerateRuntimeCall(const InstructionSource& source, |
| intptr_t deopt_id, |
| const RuntimeEntry& entry, |
| intptr_t argument_count, |
| LocationSummary* locs) { |
| __ CallRuntime(entry, argument_count); |
| EmitCallsiteMetadata(source, deopt_id, UntaggedPcDescriptors::kOther, locs); |
| } |
| |
| void FlowGraphCompiler::EmitEdgeCounter(intptr_t edge_id) { |
| // We do not check for overflow when incrementing the edge counter. The |
| // function should normally be optimized long before the counter can |
| // overflow; and though we do not reset the counters when we optimize or |
| // deoptimize, there is a bound on the number of |
| // optimization/deoptimization cycles we will attempt. |
| ASSERT(!edge_counters_array_.IsNull()); |
| ASSERT(assembler_->constant_pool_allowed()); |
| __ Comment("Edge counter"); |
| __ LoadObject(R0, edge_counters_array_); |
| #if defined(DEBUG) |
| bool old_use_far_branches = assembler_->use_far_branches(); |
| assembler_->set_use_far_branches(true); |
| #endif // DEBUG |
| __ LoadFieldFromOffset(R1, R0, |
| compiler::target::Array::element_offset(edge_id)); |
| __ add(R1, R1, compiler::Operand(Smi::RawValue(1))); |
| __ StoreIntoObjectNoBarrierOffset( |
| R0, compiler::target::Array::element_offset(edge_id), R1); |
| #if defined(DEBUG) |
| assembler_->set_use_far_branches(old_use_far_branches); |
| #endif // DEBUG |
| } |
| |
| void FlowGraphCompiler::EmitOptimizedInstanceCall( |
| const Code& stub, |
| const ICData& ic_data, |
| intptr_t deopt_id, |
| const InstructionSource& source, |
| LocationSummary* locs, |
| Code::EntryKind entry_kind) { |
| ASSERT(CanCallDart()); |
| ASSERT(Array::Handle(zone(), ic_data.arguments_descriptor()).Length() > 0); |
| // Each ICData propagated from unoptimized to optimized code contains the |
| // function that corresponds to the Dart function of that IC call. Due |
| // to inlining in optimized code, that function may not correspond to the |
| // top-level function (parsed_function().function()) which could be |
| // reoptimized and which counter needs to be incremented. |
| // Pass the function explicitly, it is used in IC stub. |
| |
| __ LoadObject(R8, parsed_function().function()); |
| __ LoadFromOffset(R0, SP, (ic_data.SizeWithoutTypeArgs() - 1) * kWordSize); |
| __ LoadUniqueObject(R9, ic_data); |
| GenerateDartCall(deopt_id, source, stub, UntaggedPcDescriptors::kIcCall, locs, |
| entry_kind); |
| __ Drop(ic_data.SizeWithTypeArgs()); |
| } |
| |
| void FlowGraphCompiler::EmitInstanceCallJIT(const Code& stub, |
| const ICData& ic_data, |
| intptr_t deopt_id, |
| const InstructionSource& source, |
| LocationSummary* locs, |
| Code::EntryKind entry_kind) { |
| ASSERT(CanCallDart()); |
| ASSERT(entry_kind == Code::EntryKind::kNormal || |
| entry_kind == Code::EntryKind::kUnchecked); |
| ASSERT(Array::Handle(zone(), ic_data.arguments_descriptor()).Length() > 0); |
| __ LoadFromOffset(R0, SP, (ic_data.SizeWithoutTypeArgs() - 1) * kWordSize); |
| __ LoadUniqueObject(R9, ic_data); |
| __ LoadUniqueObject(CODE_REG, stub); |
| const intptr_t entry_point_offset = |
| entry_kind == Code::EntryKind::kNormal |
| ? Code::entry_point_offset(Code::EntryKind::kMonomorphic) |
| : Code::entry_point_offset(Code::EntryKind::kMonomorphicUnchecked); |
| __ Call(compiler::FieldAddress(CODE_REG, entry_point_offset)); |
| EmitCallsiteMetadata(source, deopt_id, UntaggedPcDescriptors::kIcCall, locs); |
| __ Drop(ic_data.SizeWithTypeArgs()); |
| } |
| |
| void FlowGraphCompiler::EmitMegamorphicInstanceCall( |
| const String& name, |
| const Array& arguments_descriptor, |
| intptr_t deopt_id, |
| const InstructionSource& source, |
| LocationSummary* locs, |
| intptr_t try_index, |
| intptr_t slow_path_argument_count) { |
| ASSERT(CanCallDart()); |
| ASSERT(!arguments_descriptor.IsNull() && (arguments_descriptor.Length() > 0)); |
| const ArgumentsDescriptor args_desc(arguments_descriptor); |
| const MegamorphicCache& cache = MegamorphicCache::ZoneHandle( |
| zone(), |
| MegamorphicCacheTable::Lookup(thread(), name, arguments_descriptor)); |
| |
| __ Comment("MegamorphicCall"); |
| // Load receiver into R0. |
| __ LoadFromOffset(R0, SP, |
| (args_desc.Count() - 1) * compiler::target::kWordSize); |
| // Use same code pattern as instance call so it can be parsed by code patcher. |
| if (FLAG_precompiled_mode) { |
| if (FLAG_use_bare_instructions) { |
| // The AOT runtime will replace the slot in the object pool with the |
| // entrypoint address - see clustered_snapshot.cc. |
| CLOBBERS_LR(__ LoadUniqueObject(LR, StubCode::MegamorphicCall())); |
| } else { |
| __ LoadUniqueObject(CODE_REG, StubCode::MegamorphicCall()); |
| CLOBBERS_LR( |
| __ ldr(LR, compiler::FieldAddress( |
| CODE_REG, compiler::target::Code::entry_point_offset( |
| Code::EntryKind::kMonomorphic)))); |
| } |
| __ LoadUniqueObject(R9, cache); |
| CLOBBERS_LR(__ blx(LR)); |
| |
| } else { |
| __ LoadUniqueObject(R9, cache); |
| __ LoadUniqueObject(CODE_REG, StubCode::MegamorphicCall()); |
| __ Call(compiler::FieldAddress( |
| CODE_REG, Code::entry_point_offset(Code::EntryKind::kMonomorphic))); |
| } |
| |
| RecordSafepoint(locs, slow_path_argument_count); |
| const intptr_t deopt_id_after = DeoptId::ToDeoptAfter(deopt_id); |
| if (FLAG_precompiled_mode) { |
| // Megamorphic calls may occur in slow path stubs. |
| // If valid use try_index argument. |
| if (try_index == kInvalidTryIndex) { |
| try_index = CurrentTryIndex(); |
| } |
| AddDescriptor(UntaggedPcDescriptors::kOther, assembler()->CodeSize(), |
| DeoptId::kNone, source, try_index); |
| } else if (is_optimizing()) { |
| AddCurrentDescriptor(UntaggedPcDescriptors::kOther, DeoptId::kNone, source); |
| AddDeoptIndexAtCall(deopt_id_after); |
| } else { |
| AddCurrentDescriptor(UntaggedPcDescriptors::kOther, DeoptId::kNone, source); |
| // Add deoptimization continuation point after the call and before the |
| // arguments are removed. |
| AddCurrentDescriptor(UntaggedPcDescriptors::kDeopt, deopt_id_after, source); |
| } |
| RecordCatchEntryMoves(pending_deoptimization_env_, try_index); |
| __ Drop(args_desc.SizeWithTypeArgs()); |
| } |
| |
| void FlowGraphCompiler::EmitInstanceCallAOT(const ICData& ic_data, |
| intptr_t deopt_id, |
| const InstructionSource& source, |
| LocationSummary* locs, |
| Code::EntryKind entry_kind, |
| bool receiver_can_be_smi) { |
| ASSERT(CanCallDart()); |
| ASSERT(entry_kind == Code::EntryKind::kNormal || |
| entry_kind == Code::EntryKind::kUnchecked); |
| ASSERT(ic_data.NumArgsTested() == 1); |
| const Code& initial_stub = StubCode::SwitchableCallMiss(); |
| const char* switchable_call_mode = "smiable"; |
| if (!receiver_can_be_smi) { |
| switchable_call_mode = "non-smi"; |
| ic_data.set_receiver_cannot_be_smi(true); |
| } |
| const UnlinkedCall& data = |
| UnlinkedCall::ZoneHandle(zone(), ic_data.AsUnlinkedCall()); |
| |
| __ Comment("InstanceCallAOT (%s)", switchable_call_mode); |
| __ LoadFromOffset( |
| R0, SP, |
| (ic_data.SizeWithoutTypeArgs() - 1) * compiler::target::kWordSize); |
| if (FLAG_precompiled_mode && FLAG_use_bare_instructions) { |
| // The AOT runtime will replace the slot in the object pool with the |
| // entrypoint address - see clustered_snapshot.cc. |
| CLOBBERS_LR(__ LoadUniqueObject(LR, initial_stub)); |
| } else { |
| __ LoadUniqueObject(CODE_REG, initial_stub); |
| const intptr_t entry_point_offset = |
| entry_kind == Code::EntryKind::kNormal |
| ? compiler::target::Code::entry_point_offset( |
| Code::EntryKind::kMonomorphic) |
| : compiler::target::Code::entry_point_offset( |
| Code::EntryKind::kMonomorphicUnchecked); |
| CLOBBERS_LR( |
| __ ldr(LR, compiler::FieldAddress(CODE_REG, entry_point_offset))); |
| } |
| __ LoadUniqueObject(R9, data); |
| CLOBBERS_LR(__ blx(LR)); |
| |
| EmitCallsiteMetadata(source, DeoptId::kNone, UntaggedPcDescriptors::kOther, |
| locs); |
| __ Drop(ic_data.SizeWithTypeArgs()); |
| } |
| |
| void FlowGraphCompiler::EmitUnoptimizedStaticCall( |
| intptr_t size_with_type_args, |
| intptr_t deopt_id, |
| const InstructionSource& source, |
| LocationSummary* locs, |
| const ICData& ic_data, |
| Code::EntryKind entry_kind) { |
| ASSERT(CanCallDart()); |
| const Code& stub = |
| StubCode::UnoptimizedStaticCallEntry(ic_data.NumArgsTested()); |
| __ LoadObject(R9, ic_data); |
| GenerateDartCall(deopt_id, source, stub, |
| UntaggedPcDescriptors::kUnoptStaticCall, locs, entry_kind); |
| __ Drop(size_with_type_args); |
| } |
| |
| void FlowGraphCompiler::EmitOptimizedStaticCall( |
| const Function& function, |
| const Array& arguments_descriptor, |
| intptr_t size_with_type_args, |
| intptr_t deopt_id, |
| const InstructionSource& source, |
| LocationSummary* locs, |
| Code::EntryKind entry_kind) { |
| ASSERT(CanCallDart()); |
| ASSERT(!function.IsClosureFunction()); |
| if (function.HasOptionalParameters() || function.IsGeneric()) { |
| __ LoadObject(R4, arguments_descriptor); |
| } else { |
| if (!(FLAG_precompiled_mode && FLAG_use_bare_instructions)) { |
| __ LoadImmediate(R4, 0); // GC safe smi zero because of stub. |
| } |
| } |
| // Do not use the code from the function, but let the code be patched so that |
| // we can record the outgoing edges to other code. |
| GenerateStaticDartCall(deopt_id, source, UntaggedPcDescriptors::kOther, locs, |
| function, entry_kind); |
| __ Drop(size_with_type_args); |
| } |
| |
| void FlowGraphCompiler::EmitDispatchTableCall( |
| Register cid_reg, |
| int32_t selector_offset, |
| const Array& arguments_descriptor) { |
| ASSERT(CanCallDart()); |
| ASSERT(cid_reg != ARGS_DESC_REG); |
| if (!arguments_descriptor.IsNull()) { |
| __ LoadObject(ARGS_DESC_REG, arguments_descriptor); |
| } |
| intptr_t offset = (selector_offset - DispatchTable::OriginElement()) * |
| compiler::target::kWordSize; |
| CLOBBERS_LR({ |
| if (offset == 0) { |
| __ ldr(LR, compiler::Address(DISPATCH_TABLE_REG, cid_reg, LSL, |
| compiler::target::kWordSizeLog2)); |
| } else { |
| __ add(LR, DISPATCH_TABLE_REG, |
| compiler::Operand(cid_reg, LSL, compiler::target::kWordSizeLog2)); |
| if (!Utils::IsAbsoluteUint(12, offset)) { |
| const intptr_t adjust = offset & -(1 << 12); |
| __ AddImmediate(LR, LR, adjust); |
| offset -= adjust; |
| } |
| __ ldr(LR, compiler::Address(LR, offset)); |
| } |
| __ blx(LR); |
| }); |
| } |
| |
| Condition FlowGraphCompiler::EmitEqualityRegConstCompare( |
| Register reg, |
| const Object& obj, |
| bool needs_number_check, |
| const InstructionSource& source, |
| intptr_t deopt_id) { |
| if (needs_number_check) { |
| ASSERT(!obj.IsMint() && !obj.IsDouble()); |
| __ Push(reg); |
| __ PushObject(obj); |
| if (is_optimizing()) { |
| __ BranchLinkPatchable(StubCode::OptimizedIdenticalWithNumberCheck()); |
| } else { |
| __ BranchLinkPatchable(StubCode::UnoptimizedIdenticalWithNumberCheck()); |
| } |
| AddCurrentDescriptor(UntaggedPcDescriptors::kRuntimeCall, deopt_id, source); |
| // Stub returns result in flags (result of a cmp, we need Z computed). |
| __ Drop(1); // Discard constant. |
| __ Pop(reg); // Restore 'reg'. |
| } else { |
| __ CompareObject(reg, obj); |
| } |
| return EQ; |
| } |
| |
| Condition FlowGraphCompiler::EmitEqualityRegRegCompare( |
| Register left, |
| Register right, |
| bool needs_number_check, |
| const InstructionSource& source, |
| intptr_t deopt_id) { |
| if (needs_number_check) { |
| __ Push(left); |
| __ Push(right); |
| if (is_optimizing()) { |
| __ BranchLinkPatchable(StubCode::OptimizedIdenticalWithNumberCheck()); |
| } else { |
| __ BranchLinkPatchable(StubCode::UnoptimizedIdenticalWithNumberCheck()); |
| } |
| AddCurrentDescriptor(UntaggedPcDescriptors::kRuntimeCall, deopt_id, source); |
| // Stub returns result in flags (result of a cmp, we need Z computed). |
| __ Pop(right); |
| __ Pop(left); |
| } else { |
| __ cmp(left, compiler::Operand(right)); |
| } |
| return EQ; |
| } |
| |
| Condition FlowGraphCompiler::EmitBoolTest(Register value, |
| BranchLabels labels, |
| bool invert) { |
| __ Comment("BoolTest"); |
| __ tst(value, |
| compiler::Operand(compiler::target::ObjectAlignment::kBoolValueMask)); |
| return invert ? NE : EQ; |
| } |
| |
| // This function must be in sync with FlowGraphCompiler::RecordSafepoint and |
| // FlowGraphCompiler::SlowPathEnvironmentFor. |
| void FlowGraphCompiler::SaveLiveRegisters(LocationSummary* locs) { |
| #if defined(DEBUG) |
| locs->CheckWritableInputs(); |
| ClobberDeadTempRegisters(locs); |
| #endif |
| // TODO(vegorov): consider saving only caller save (volatile) registers. |
| __ PushRegisters(*locs->live_registers()); |
| } |
| |
| void FlowGraphCompiler::RestoreLiveRegisters(LocationSummary* locs) { |
| __ PopRegisters(*locs->live_registers()); |
| } |
| |
| #if defined(DEBUG) |
| void FlowGraphCompiler::ClobberDeadTempRegisters(LocationSummary* locs) { |
| // Clobber temporaries that have not been manually preserved. |
| for (intptr_t i = 0; i < locs->temp_count(); ++i) { |
| Location tmp = locs->temp(i); |
| // TODO(zerny): clobber non-live temporary FPU registers. |
| if (tmp.IsRegister() && |
| !locs->live_registers()->ContainsRegister(tmp.reg())) { |
| __ mov(tmp.reg(), compiler::Operand(0xf7)); |
| } |
| } |
| } |
| #endif |
| |
| Register FlowGraphCompiler::EmitTestCidRegister() { |
| return R2; |
| } |
| |
| void FlowGraphCompiler::EmitTestAndCallLoadReceiver( |
| intptr_t count_without_type_args, |
| const Array& arguments_descriptor) { |
| __ Comment("EmitTestAndCall"); |
| // Load receiver into R0. |
| __ LoadFromOffset( |
| R0, SP, (count_without_type_args - 1) * compiler::target::kWordSize); |
| __ LoadObject(R4, arguments_descriptor); |
| } |
| |
| void FlowGraphCompiler::EmitTestAndCallSmiBranch(compiler::Label* label, |
| bool if_smi) { |
| __ tst(R0, compiler::Operand(kSmiTagMask)); |
| // Jump if receiver is not Smi. |
| __ b(label, if_smi ? EQ : NE); |
| } |
| |
| void FlowGraphCompiler::EmitTestAndCallLoadCid(Register class_id_reg) { |
| ASSERT(class_id_reg != R0); |
| __ LoadClassId(class_id_reg, R0); |
| } |
| |
| #undef __ |
| #define __ assembler-> |
| |
| int FlowGraphCompiler::EmitTestAndCallCheckCid(compiler::Assembler* assembler, |
| compiler::Label* label, |
| Register class_id_reg, |
| const CidRangeValue& range, |
| int bias, |
| bool jump_on_miss) { |
| intptr_t cid_start = range.cid_start; |
| if (range.IsSingleCid()) { |
| __ AddImmediateSetFlags(class_id_reg, class_id_reg, bias - cid_start); |
| __ BranchIf(jump_on_miss ? NOT_ZERO : ZERO, label); |
| bias = cid_start; |
| } else { |
| __ AddImmediate(class_id_reg, class_id_reg, bias - cid_start); |
| __ CompareImmediate(class_id_reg, range.Extent()); |
| __ BranchIf(jump_on_miss ? UNSIGNED_GREATER : UNSIGNED_LESS_EQUAL, label); |
| bias = cid_start; |
| } |
| return bias; |
| } |
| |
| #undef __ |
| #define __ assembler()-> |
| |
| void FlowGraphCompiler::EmitMove(Location destination, |
| Location source, |
| TemporaryRegisterAllocator* allocator) { |
| if (destination.Equals(source)) return; |
| |
| if (source.IsRegister()) { |
| if (destination.IsRegister()) { |
| __ mov(destination.reg(), compiler::Operand(source.reg())); |
| } else { |
| ASSERT(destination.IsStackSlot()); |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| __ StoreToOffset(source.reg(), destination.base_reg(), dest_offset); |
| } |
| } else if (source.IsStackSlot()) { |
| if (destination.IsRegister()) { |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| __ LoadFromOffset(destination.reg(), source.base_reg(), source_offset); |
| } else { |
| ASSERT(destination.IsStackSlot()); |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| |
| CLOBBERS_LR({ |
| // LR not used by register allocator. |
| COMPILE_ASSERT(((1 << LR) & kDartAvailableCpuRegs) == 0); |
| // StoreToOffset uses TMP in the case where dest_offset is too large or |
| // small in order to calculate a new base. We fall back to using LR as a |
| // temporary as we know we're in a ParallelMove. |
| const Register temp_reg = LR; |
| |
| __ LoadFromOffset(temp_reg, source.base_reg(), source_offset); |
| __ StoreToOffset(temp_reg, destination.base_reg(), dest_offset); |
| }); |
| } |
| } else if (source.IsFpuRegister()) { |
| if (destination.IsFpuRegister()) { |
| if (TargetCPUFeatures::neon_supported()) { |
| __ vmovq(destination.fpu_reg(), source.fpu_reg()); |
| } else { |
| // If we're not inlining simd values, then only the even numbered D |
| // register will have anything in them. |
| __ vmovd(EvenDRegisterOf(destination.fpu_reg()), |
| EvenDRegisterOf(source.fpu_reg())); |
| } |
| } else if (destination.IsStackSlot()) { |
| // 32-bit float |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| const SRegister src = EvenSRegisterOf(EvenDRegisterOf(source.fpu_reg())); |
| __ StoreSToOffset(src, destination.base_reg(), dest_offset); |
| } else if (destination.IsDoubleStackSlot()) { |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| DRegister src = EvenDRegisterOf(source.fpu_reg()); |
| __ StoreDToOffset(src, destination.base_reg(), dest_offset); |
| } else { |
| ASSERT(destination.IsQuadStackSlot()); |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| const DRegister dsrc0 = EvenDRegisterOf(source.fpu_reg()); |
| __ StoreMultipleDToOffset(dsrc0, 2, destination.base_reg(), dest_offset); |
| } |
| } else if (source.IsDoubleStackSlot()) { |
| if (destination.IsFpuRegister()) { |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| const DRegister dst = EvenDRegisterOf(destination.fpu_reg()); |
| __ LoadDFromOffset(dst, source.base_reg(), source_offset); |
| } else if (destination.IsStackSlot()) { |
| // 32-bit float |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| __ LoadSFromOffset(STMP, source.base_reg(), source_offset); |
| __ StoreSToOffset(STMP, destination.base_reg(), dest_offset); |
| } else { |
| ASSERT(destination.IsDoubleStackSlot()); |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| __ LoadDFromOffset(DTMP, source.base_reg(), source_offset); |
| __ StoreDToOffset(DTMP, destination.base_reg(), dest_offset); |
| } |
| } else if (source.IsQuadStackSlot()) { |
| if (destination.IsFpuRegister()) { |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| const DRegister dst0 = EvenDRegisterOf(destination.fpu_reg()); |
| __ LoadMultipleDFromOffset(dst0, 2, source.base_reg(), source_offset); |
| } else { |
| ASSERT(destination.IsQuadStackSlot()); |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| const DRegister dtmp0 = DTMP; |
| __ LoadMultipleDFromOffset(dtmp0, 2, source.base_reg(), source_offset); |
| __ StoreMultipleDToOffset(dtmp0, 2, destination.base_reg(), dest_offset); |
| } |
| } else if (source.IsPairLocation()) { |
| ASSERT(destination.IsPairLocation()); |
| for (intptr_t i : {0, 1}) { |
| EmitMove(destination.Component(i), source.Component(i), allocator); |
| } |
| } else { |
| ASSERT(source.IsConstant()); |
| if (destination.IsFpuRegister() || destination.IsDoubleStackSlot() || |
| destination.IsStackSlot()) { |
| Register tmp = allocator->AllocateTemporary(); |
| source.constant_instruction()->EmitMoveToLocation(this, destination, tmp); |
| allocator->ReleaseTemporary(); |
| } else { |
| source.constant_instruction()->EmitMoveToLocation(this, destination); |
| } |
| } |
| } |
| |
| static compiler::OperandSize BytesToOperandSize(intptr_t bytes) { |
| switch (bytes) { |
| case 4: |
| return compiler::OperandSize::kFourBytes; |
| case 2: |
| return compiler::OperandSize::kTwoBytes; |
| case 1: |
| return compiler::OperandSize::kByte; |
| default: |
| UNIMPLEMENTED(); |
| } |
| } |
| |
| void FlowGraphCompiler::EmitNativeMoveArchitecture( |
| const compiler::ffi::NativeLocation& destination, |
| const compiler::ffi::NativeLocation& source) { |
| const auto& src_payload_type = source.payload_type(); |
| const auto& dst_payload_type = destination.payload_type(); |
| const auto& src_container_type = source.container_type(); |
| const auto& dst_container_type = destination.container_type(); |
| ASSERT(src_container_type.IsFloat() == dst_container_type.IsFloat()); |
| ASSERT(src_container_type.IsInt() == dst_container_type.IsInt()); |
| ASSERT(src_payload_type.IsSigned() == dst_payload_type.IsSigned()); |
| ASSERT(src_payload_type.IsPrimitive()); |
| ASSERT(dst_payload_type.IsPrimitive()); |
| const intptr_t src_size = src_payload_type.SizeInBytes(); |
| const intptr_t dst_size = dst_payload_type.SizeInBytes(); |
| const bool sign_or_zero_extend = dst_size > src_size; |
| |
| if (source.IsRegisters()) { |
| const auto& src = source.AsRegisters(); |
| ASSERT(src.num_regs() == 1); |
| ASSERT(src_size <= 4); |
| const auto src_reg = src.reg_at(0); |
| |
| if (destination.IsRegisters()) { |
| const auto& dst = destination.AsRegisters(); |
| ASSERT(dst.num_regs() == 1); |
| const auto dst_reg = dst.reg_at(0); |
| if (!sign_or_zero_extend) { |
| ASSERT(dst_size == 4); |
| __ mov(dst_reg, compiler::Operand(src_reg)); |
| } else { |
| ASSERT(sign_or_zero_extend); |
| // Arm has no sign- or zero-extension instructions, so use shifts. |
| const intptr_t shift_length = |
| (compiler::target::kWordSize - src_size) * kBitsPerByte; |
| __ Lsl(dst_reg, src_reg, compiler::Operand(shift_length)); |
| if (src_payload_type.IsSigned()) { |
| __ Asr(dst_reg, dst_reg, compiler::Operand(shift_length)); |
| } else { |
| __ Lsr(dst_reg, dst_reg, compiler::Operand(shift_length)); |
| } |
| } |
| |
| } else if (destination.IsFpuRegisters()) { |
| // Fpu Registers should only contain doubles and registers only ints. |
| // The bit casts are done with a BitCastInstr. |
| // TODO(dartbug.com/40371): Remove BitCastInstr and implement here. |
| UNIMPLEMENTED(); |
| |
| } else { |
| ASSERT(destination.IsStack()); |
| const auto& dst = destination.AsStack(); |
| ASSERT(!sign_or_zero_extend); |
| ASSERT(dst_size <= 4); |
| auto const op_size = BytesToOperandSize(dst_size); |
| __ StoreToOffset(src.reg_at(0), dst.base_register(), |
| dst.offset_in_bytes(), op_size); |
| } |
| |
| } else if (source.IsFpuRegisters()) { |
| const auto& src = source.AsFpuRegisters(); |
| // We have not implemented conversions here, use IL convert instructions. |
| ASSERT(src_payload_type.Equals(dst_payload_type)); |
| |
| if (destination.IsRegisters()) { |
| // Fpu Registers should only contain doubles and registers only ints. |
| // The bit casts are done with a BitCastInstr. |
| // TODO(dartbug.com/40371): Remove BitCastInstr and implement here. |
| UNIMPLEMENTED(); |
| |
| } else if (destination.IsFpuRegisters()) { |
| const auto& dst = destination.AsFpuRegisters(); |
| switch (dst_size) { |
| case 16: |
| __ vmovq(dst.fpu_reg(), src.fpu_reg()); |
| return; |
| case 8: |
| __ vmovd(dst.fpu_as_d_reg(), src.fpu_as_d_reg()); |
| return; |
| case 4: |
| __ vmovs(dst.fpu_as_s_reg(), src.fpu_as_s_reg()); |
| return; |
| default: |
| UNREACHABLE(); |
| } |
| |
| } else { |
| ASSERT(destination.IsStack()); |
| ASSERT(src_payload_type.IsFloat()); |
| const auto& dst = destination.AsStack(); |
| switch (dst_size) { |
| case 8: |
| __ StoreDToOffset(src.fpu_as_d_reg(), dst.base_register(), |
| dst.offset_in_bytes()); |
| return; |
| case 4: |
| __ StoreSToOffset(src.fpu_as_s_reg(), dst.base_register(), |
| dst.offset_in_bytes()); |
| return; |
| default: |
| // TODO(dartbug.com/37470): Case 16 for simd packed data. |
| UNREACHABLE(); |
| } |
| } |
| |
| } else { |
| ASSERT(source.IsStack()); |
| const auto& src = source.AsStack(); |
| if (destination.IsRegisters()) { |
| const auto& dst = destination.AsRegisters(); |
| ASSERT(dst.num_regs() == 1); |
| const auto dst_reg = dst.reg_at(0); |
| ASSERT(!sign_or_zero_extend); |
| ASSERT(dst_size <= 4); |
| auto const op_size = BytesToOperandSize(dst_size); |
| __ LoadFromOffset(dst_reg, src.base_register(), src.offset_in_bytes(), |
| op_size); |
| |
| } else if (destination.IsFpuRegisters()) { |
| ASSERT(src_payload_type.Equals(dst_payload_type)); |
| ASSERT(src_payload_type.IsFloat()); |
| const auto& dst = destination.AsFpuRegisters(); |
| switch (src_size) { |
| case 8: |
| __ LoadDFromOffset(dst.fpu_as_d_reg(), src.base_register(), |
| src.offset_in_bytes()); |
| return; |
| case 4: |
| __ LoadSFromOffset(dst.fpu_as_s_reg(), src.base_register(), |
| src.offset_in_bytes()); |
| return; |
| default: |
| UNIMPLEMENTED(); |
| } |
| |
| } else { |
| ASSERT(destination.IsStack()); |
| UNREACHABLE(); |
| } |
| } |
| } |
| |
| void FlowGraphCompiler::LoadBSSEntry(BSS::Relocation relocation, |
| Register dst, |
| Register tmp) { |
| compiler::Label skip_reloc; |
| __ b(&skip_reloc); |
| InsertBSSRelocation(relocation); |
| __ Bind(&skip_reloc); |
| |
| // For historical reasons, the PC on ARM points 8 bytes (two instructions) |
| // past the current instruction. |
| __ sub(tmp, PC, |
| compiler::Operand(Instr::kPCReadOffset + compiler::target::kWordSize)); |
| |
| // tmp holds the address of the relocation. |
| __ ldr(dst, compiler::Address(tmp)); |
| |
| // dst holds the relocation itself: tmp - bss_start. |
| // tmp = tmp + (bss_start - tmp) = bss_start |
| __ add(tmp, tmp, compiler::Operand(dst)); |
| |
| // tmp holds the start of the BSS section. |
| // Load the "get-thread" routine: *bss_start. |
| __ ldr(dst, compiler::Address(tmp)); |
| } |
| |
| #undef __ |
| #define __ compiler_->assembler()-> |
| |
| void ParallelMoveResolver::EmitSwap(int index) { |
| MoveOperands* move = moves_[index]; |
| const Location source = move->src(); |
| const Location destination = move->dest(); |
| |
| if (source.IsRegister() && destination.IsRegister()) { |
| ASSERT(source.reg() != IP); |
| ASSERT(destination.reg() != IP); |
| __ mov(IP, compiler::Operand(source.reg())); |
| __ mov(source.reg(), compiler::Operand(destination.reg())); |
| __ mov(destination.reg(), compiler::Operand(IP)); |
| } else if (source.IsRegister() && destination.IsStackSlot()) { |
| Exchange(source.reg(), destination.base_reg(), |
| destination.ToStackSlotOffset()); |
| } else if (source.IsStackSlot() && destination.IsRegister()) { |
| Exchange(destination.reg(), source.base_reg(), source.ToStackSlotOffset()); |
| } else if (source.IsStackSlot() && destination.IsStackSlot()) { |
| Exchange(source.base_reg(), source.ToStackSlotOffset(), |
| destination.base_reg(), destination.ToStackSlotOffset()); |
| } else if (source.IsFpuRegister() && destination.IsFpuRegister()) { |
| if (TargetCPUFeatures::neon_supported()) { |
| const QRegister dst = destination.fpu_reg(); |
| const QRegister src = source.fpu_reg(); |
| ASSERT(dst != QTMP && src != QTMP); |
| __ vmovq(QTMP, src); |
| __ vmovq(src, dst); |
| __ vmovq(dst, QTMP); |
| } else { |
| const DRegister dst = EvenDRegisterOf(destination.fpu_reg()); |
| const DRegister src = EvenDRegisterOf(source.fpu_reg()); |
| ASSERT(dst != DTMP && src != DTMP); |
| __ vmovd(DTMP, src); |
| __ vmovd(src, dst); |
| __ vmovd(dst, DTMP); |
| } |
| } else if (source.IsFpuRegister() || destination.IsFpuRegister()) { |
| ASSERT(destination.IsDoubleStackSlot() || destination.IsQuadStackSlot() || |
| source.IsDoubleStackSlot() || source.IsQuadStackSlot()); |
| bool double_width = |
| destination.IsDoubleStackSlot() || source.IsDoubleStackSlot(); |
| QRegister qreg = |
| source.IsFpuRegister() ? source.fpu_reg() : destination.fpu_reg(); |
| DRegister reg = EvenDRegisterOf(qreg); |
| Register base_reg = |
| source.IsFpuRegister() ? destination.base_reg() : source.base_reg(); |
| const intptr_t slot_offset = source.IsFpuRegister() |
| ? destination.ToStackSlotOffset() |
| : source.ToStackSlotOffset(); |
| |
| if (double_width) { |
| __ LoadDFromOffset(DTMP, base_reg, slot_offset); |
| __ StoreDToOffset(reg, base_reg, slot_offset); |
| __ vmovd(reg, DTMP); |
| } else { |
| __ LoadMultipleDFromOffset(DTMP, 2, base_reg, slot_offset); |
| __ StoreMultipleDToOffset(reg, 2, base_reg, slot_offset); |
| __ vmovq(qreg, QTMP); |
| } |
| } else if (source.IsDoubleStackSlot() && destination.IsDoubleStackSlot()) { |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| |
| ScratchFpuRegisterScope ensure_scratch(this, kNoQRegister); |
| DRegister scratch = EvenDRegisterOf(ensure_scratch.reg()); |
| __ LoadDFromOffset(DTMP, source.base_reg(), source_offset); |
| __ LoadDFromOffset(scratch, destination.base_reg(), dest_offset); |
| __ StoreDToOffset(DTMP, destination.base_reg(), dest_offset); |
| __ StoreDToOffset(scratch, destination.base_reg(), source_offset); |
| } else if (source.IsQuadStackSlot() && destination.IsQuadStackSlot()) { |
| const intptr_t source_offset = source.ToStackSlotOffset(); |
| const intptr_t dest_offset = destination.ToStackSlotOffset(); |
| |
| ScratchFpuRegisterScope ensure_scratch(this, kNoQRegister); |
| DRegister scratch = EvenDRegisterOf(ensure_scratch.reg()); |
| __ LoadMultipleDFromOffset(DTMP, 2, source.base_reg(), source_offset); |
| __ LoadMultipleDFromOffset(scratch, 2, destination.base_reg(), dest_offset); |
| __ StoreMultipleDToOffset(DTMP, 2, destination.base_reg(), dest_offset); |
| __ StoreMultipleDToOffset(scratch, 2, destination.base_reg(), |
| source_offset); |
| } else { |
| UNREACHABLE(); |
| } |
| |
| // The swap of source and destination has executed a move from source to |
| // destination. |
| move->Eliminate(); |
| |
| // Any unperformed (including pending) move with a source of either |
| // this move's source or destination needs to have their source |
| // changed to reflect the state of affairs after the swap. |
| for (int i = 0; i < moves_.length(); ++i) { |
| const MoveOperands& other_move = *moves_[i]; |
| if (other_move.Blocks(source)) { |
| moves_[i]->set_src(destination); |
| } else if (other_move.Blocks(destination)) { |
| moves_[i]->set_src(source); |
| } |
| } |
| } |
| |
| void ParallelMoveResolver::MoveMemoryToMemory(const compiler::Address& dst, |
| const compiler::Address& src) { |
| UNREACHABLE(); |
| } |
| |
| // Do not call or implement this function. Instead, use the form below that |
| // uses an offset from the frame pointer instead of an Address. |
| void ParallelMoveResolver::Exchange(Register reg, |
| const compiler::Address& mem) { |
| UNREACHABLE(); |
| } |
| |
| // Do not call or implement this function. Instead, use the form below that |
| // uses offsets from the frame pointer instead of Addresses. |
| void ParallelMoveResolver::Exchange(const compiler::Address& mem1, |
| const compiler::Address& mem2) { |
| UNREACHABLE(); |
| } |
| |
| void ParallelMoveResolver::Exchange(Register reg, |
| Register base_reg, |
| intptr_t stack_offset) { |
| ScratchRegisterScope tmp(this, reg); |
| __ mov(tmp.reg(), compiler::Operand(reg)); |
| __ LoadFromOffset(reg, base_reg, stack_offset); |
| __ StoreToOffset(tmp.reg(), base_reg, stack_offset); |
| } |
| |
| void ParallelMoveResolver::Exchange(Register base_reg1, |
| intptr_t stack_offset1, |
| Register base_reg2, |
| intptr_t stack_offset2) { |
| ScratchRegisterScope tmp1(this, kNoRegister); |
| ScratchRegisterScope tmp2(this, tmp1.reg()); |
| __ LoadFromOffset(tmp1.reg(), base_reg1, stack_offset1); |
| __ LoadFromOffset(tmp2.reg(), base_reg2, stack_offset2); |
| __ StoreToOffset(tmp1.reg(), base_reg2, stack_offset2); |
| __ StoreToOffset(tmp2.reg(), base_reg1, stack_offset1); |
| } |
| |
| void ParallelMoveResolver::SpillScratch(Register reg) { |
| __ Push(reg); |
| } |
| |
| void ParallelMoveResolver::RestoreScratch(Register reg) { |
| __ Pop(reg); |
| } |
| |
| void ParallelMoveResolver::SpillFpuScratch(FpuRegister reg) { |
| DRegister dreg = EvenDRegisterOf(reg); |
| __ vstrd(dreg, |
| compiler::Address(SP, -kDoubleSize, compiler::Address::PreIndex)); |
| } |
| |
| void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) { |
| DRegister dreg = EvenDRegisterOf(reg); |
| __ vldrd(dreg, |
| compiler::Address(SP, kDoubleSize, compiler::Address::PostIndex)); |
| } |
| |
| #undef __ |
| |
| } // namespace dart |
| |
| #endif // defined(TARGET_ARCH_ARM) |
