VM: Re-format to use at most one newline between functions

runtime/vm/stub_code_arm64.cc

 // Copyright (c) 2014, 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"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 105 matching lines @@
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, THR, Thread::vm_tag_offset());
 
   // Reset exit frame information in Isolate structure.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset());
 
   __ LeaveStubFrame();
   __ ret();
 }
 
-
 // Print the stop message.
 DEFINE_LEAF_RUNTIME_ENTRY(void, PrintStopMessage, 1, const char* message) {
   OS::Print("Stop message: %s\n", message);
 }
 END_LEAF_RUNTIME_ENTRY
 
-
 void StubCode::GeneratePrintStopMessageStub(Assembler* assembler) {
   __ Stop("GeneratePrintStopMessageStub");
 }
 
-
 // Input parameters:
 //   LR : return address.
 //   SP : address of return value.
 //   R5 : address of the native function to call.
 //   R2 : address of first argument in argument array.
 //   R1 : argc_tag including number of arguments and function kind.
 static void GenerateCallNativeWithWrapperStub(Assembler* assembler,
                                               Address wrapper) {
   const intptr_t thread_offset = NativeArguments::thread_offset();
   const intptr_t argc_tag_offset = NativeArguments::argc_tag_offset();
@@ skipping 74 matching lines @@
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, THR, Thread::vm_tag_offset());
 
   // Reset exit frame information in Isolate structure.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset());
 
   __ LeaveStubFrame();
   __ ret();
 }
 
-
 void StubCode::GenerateCallNoScopeNativeStub(Assembler* assembler) {
   GenerateCallNativeWithWrapperStub(
       assembler,
       Address(THR, Thread::no_scope_native_wrapper_entry_point_offset()));
 }
 
-
 void StubCode::GenerateCallAutoScopeNativeStub(Assembler* assembler) {
   GenerateCallNativeWithWrapperStub(
       assembler,
       Address(THR, Thread::auto_scope_native_wrapper_entry_point_offset()));
 }
 
-
 // Input parameters:
 //   LR : return address.
 //   SP : address of return value.
 //   R5 : address of the native function to call.
 //   R2 : address of first argument in argument array.
 //   R1 : argc_tag including number of arguments and function kind.
 void StubCode::GenerateCallBootstrapNativeStub(Assembler* assembler) {
   const intptr_t thread_offset = NativeArguments::thread_offset();
   const intptr_t argc_tag_offset = NativeArguments::argc_tag_offset();
   const intptr_t argv_offset = NativeArguments::argv_offset();
@@ skipping 70 matching lines @@
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, THR, Thread::vm_tag_offset());
 
   // Reset exit frame information in Isolate structure.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset());
 
   __ LeaveStubFrame();
   __ ret();
 }
 
-
 // Input parameters:
 //   R4: arguments descriptor array.
 void StubCode::GenerateCallStaticFunctionStub(Assembler* assembler) {
   // Create a stub frame as we are pushing some objects on the stack before
   // calling into the runtime.
   __ EnterStubFrame();
   // Setup space on stack for return value and preserve arguments descriptor.
   __ Push(R4);
   __ Push(ZR);
   __ CallRuntime(kPatchStaticCallRuntimeEntry, 0);
   // Get Code object result and restore arguments descriptor array.
   __ Pop(CODE_REG);
   __ Pop(R4);
   // Remove the stub frame.
   __ LeaveStubFrame();
   // Jump to the dart function.
   __ LoadFieldFromOffset(R0, CODE_REG, Code::entry_point_offset());
   __ br(R0);
 }
 
-
 // Called from a static call only when an invalid code has been entered
 // (invalid because its function was optimized or deoptimized).
 // R4: arguments descriptor array.
 void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
   // Load code pointer to this stub from the thread:
   // The one that is passed in, is not correct - it points to the code object
   // that needs to be replaced.
   __ ldr(CODE_REG, Address(THR, Thread::fix_callers_target_code_offset()));
   // Create a stub frame as we are pushing some objects on the stack before
   // calling into the runtime.
   __ EnterStubFrame();
   // Setup space on stack for return value and preserve arguments descriptor.
   __ Push(R4);
   __ Push(ZR);
   __ CallRuntime(kFixCallersTargetRuntimeEntry, 0);
   // Get Code object result and restore arguments descriptor array.
   __ Pop(CODE_REG);
   __ Pop(R4);
   // Remove the stub frame.
   __ LeaveStubFrame();
   // Jump to the dart function.
   __ LoadFieldFromOffset(R0, CODE_REG, Code::entry_point_offset());
   __ br(R0);
 }
 
-
 // Called from object allocate instruction when the allocation stub has been
 // disabled.
 void StubCode::GenerateFixAllocationStubTargetStub(Assembler* assembler) {
   // Load code pointer to this stub from the thread:
   // The one that is passed in, is not correct - it points to the code object
   // that needs to be replaced.
   __ ldr(CODE_REG, Address(THR, Thread::fix_allocation_stub_code_offset()));
   __ EnterStubFrame();
   // Setup space on stack for return value.
   __ Push(ZR);
   __ CallRuntime(kFixAllocationStubTargetRuntimeEntry, 0);
   // Get Code object result.
   __ Pop(CODE_REG);
   // Remove the stub frame.
   __ LeaveStubFrame();
   // Jump to the dart function.
   __ LoadFieldFromOffset(R0, CODE_REG, Code::entry_point_offset());
   __ br(R0);
 }
 
-
 // Input parameters:
 //   R2: smi-tagged argument count, may be zero.
 //   FP[kParamEndSlotFromFp + 1]: last argument.
 static void PushArgumentsArray(Assembler* assembler) {
   // Allocate array to store arguments of caller.
   __ LoadObject(R1, Object::null_object());
   // R1: null element type for raw Array.
   // R2: smi-tagged argument count, may be zero.
   __ BranchLink(*StubCode::AllocateArray_entry());
   // R0: newly allocated array.
@@ skipping 11 matching lines @@
   __ Bind(&loop);
   __ ldr(R7, Address(R1));
   __ AddImmediate(R1, -kWordSize);
   __ AddImmediate(R3, kWordSize);
   __ AddImmediateSetFlags(R2, R2, -Smi::RawValue(1));
   __ str(R7, Address(R3, -kWordSize));
   __ b(&loop, GE);
   __ Bind(&loop_exit);
 }
 
-
 // Used by eager and lazy deoptimization. Preserve result in RAX if necessary.
 // This stub translates optimized frame into unoptimized frame. The optimized
 // frame can contain values in registers and on stack, the unoptimized
 // frame contains all values on stack.
 // Deoptimization occurs in following steps:
 // - Push all registers that can contain values.
 // - Call C routine to copy the stack and saved registers into temporary buffer.
 // - Adjust caller's frame to correct unoptimized frame size.
 // - Fill the unoptimized frame.
 // - Materialize objects that require allocation (e.g. Double instances).
@@ skipping 120 matching lines @@
   } else if (kind == kLazyDeoptFromThrow) {
     __ Pop(R1);  // Restore stacktrace.
     __ Pop(R0);  // Restore exception.
   }
   __ LeaveStubFrame();
   // Remove materialization arguments.
   __ add(SP, SP, Operand(R2));
   // The caller is responsible for emitting the return instruction.
 }
 
-
 // R0: result, must be preserved
 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) {
   // Push zap value instead of CODE_REG for lazy deopt.
   __ LoadImmediate(TMP, kZapCodeReg);
   __ Push(TMP);
   // Return address for "call" to deopt stub.
   __ LoadImmediate(LR, kZapReturnAddress);
   __ ldr(CODE_REG, Address(THR, Thread::lazy_deopt_from_return_stub_offset()));
   GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn);
   __ ret();
 }
 
-
 // R0: exception, must be preserved
 // R1: stacktrace, must be preserved
 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) {
   // Push zap value instead of CODE_REG for lazy deopt.
   __ LoadImmediate(TMP, kZapCodeReg);
   __ Push(TMP);
   // Return address for "call" to deopt stub.
   __ LoadImmediate(LR, kZapReturnAddress);
   __ ldr(CODE_REG, Address(THR, Thread::lazy_deopt_from_throw_stub_offset()));
   GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow);
   __ ret();
 }
 
-
 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
   GenerateDeoptimizationSequence(assembler, kEagerDeopt);
   __ ret();
 }
 
-
 static void GenerateDispatcherCode(Assembler* assembler,
                                    Label* call_target_function) {
   __ Comment("NoSuchMethodDispatch");
   // When lazily generated invocation dispatchers are disabled, the
   // miss-handler may return null.
   __ CompareObject(R0, Object::null_object());
   __ b(call_target_function, NE);
   __ EnterStubFrame();
 
   // Load the receiver.
@@ skipping 14 matching lines @@
   // R2: Smi-tagged arguments array length.
   PushArgumentsArray(assembler);
   const intptr_t kNumArgs = 4;
   __ CallRuntime(kInvokeNoSuchMethodDispatcherRuntimeEntry, kNumArgs);
   __ Drop(4);
   __ Pop(R0);  // Return value.
   __ LeaveStubFrame();
   __ ret();
 }
 
-
 void StubCode::GenerateMegamorphicMissStub(Assembler* assembler) {
   __ EnterStubFrame();
 
   // Load the receiver.
   __ LoadFieldFromOffset(R2, R4, ArgumentsDescriptor::count_offset());
   __ add(TMP, FP, Operand(R2, LSL, 2));  // R2 is Smi.
   __ LoadFromOffset(R6, TMP, kParamEndSlotFromFp * kWordSize);
 
   // Preserve IC data and arguments descriptor.
   __ Push(R5);
@@ skipping 24 matching lines @@
     GenerateDispatcherCode(assembler, &call_target_function);
     __ Bind(&call_target_function);
   }
 
   // Tail-call to target function.
   __ LoadFieldFromOffset(CODE_REG, R0, Function::code_offset());
   __ LoadFieldFromOffset(R2, R0, Function::entry_point_offset());
   __ br(R2);
 }
 
-
 // Called for inline allocation of arrays.
 // Input parameters:
 //   LR: return address.
 //   R2: array length as Smi.
 //   R1: array element type (either NULL or an instantiated type).
 // NOTE: R2 cannot be clobbered here as the caller relies on it being saved.
 // The newly allocated object is returned in R0.
 void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
   Label slow_case;
   // Compute the size to be allocated, it is based on the array length
@@ skipping 124 matching lines @@
   __ Push(R1);
   __ CallRuntime(kAllocateArrayRuntimeEntry, 2);
   // Pop arguments; result is popped in IP.
   __ Pop(R1);
   __ Pop(R2);
   __ Pop(R0);
   __ LeaveStubFrame();
   __ ret();
 }
 
-
 // Called when invoking Dart code from C++ (VM code).
 // Input parameters:
 //   LR : points to return address.
 //   R0 : code object of the Dart function to call.
 //   R1 : arguments descriptor array.
 //   R2 : arguments array.
 //   R3 : current thread.
 void StubCode::GenerateInvokeDartCodeStub(Assembler* assembler) {
   __ Comment("InvokeDartCodeStub");
 
@@ skipping 112 matching lines @@
     // using it as the stack pointer.
     __ ldr(r, Address(SP, 1 * kWordSize, Address::PostIndex));
   }
 
   // Restore the frame pointer and C stack pointer and return.
   __ LeaveFrame();
   __ RestoreCSP();
   __ ret();
 }
 
-
 // Called for inline allocation of contexts.
 // Input:
 //   R1: number of context variables.
 // Output:
 //   R0: new allocated RawContext object.
 void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
   if (FLAG_inline_alloc) {
     Label slow_case;
     // First compute the rounded instance size.
     // R1: number of context variables.
@@ skipping 94 matching lines @@
   __ Push(R1);
   __ CallRuntime(kAllocateContextRuntimeEntry, 1);  // Allocate context.
   __ Drop(1);  // Pop number of context variables argument.
   __ Pop(R0);  // Pop the new context object.
   // R0: new object
   // Restore the frame pointer.
   __ LeaveStubFrame();
   __ ret();
 }
 
-
 // Helper stub to implement Assembler::StoreIntoObject.
 // Input parameters:
 //   R0: Address being stored
 void StubCode::GenerateUpdateStoreBufferStub(Assembler* assembler) {
   Label add_to_buffer;
   // Check whether this object has already been remembered. Skip adding to the
   // store buffer if the object is in the store buffer already.
   __ LoadFieldFromOffset(TMP, R0, Object::tags_offset(), kWord);
   __ tsti(TMP, Immediate(1 << RawObject::kRememberedBit));
   __ b(&add_to_buffer, EQ);
@@ skipping 45 matching lines @@
   // Setup frame, push callee-saved registers.
 
   __ EnterCallRuntimeFrame(0 * kWordSize);
   __ mov(R0, THR);
   __ CallRuntime(kStoreBufferBlockProcessRuntimeEntry, 1);
   // Restore callee-saved registers, tear down frame.
   __ LeaveCallRuntimeFrame();
   __ ret();
 }
 
-
 // Called for inline allocation of objects.
 // Input parameters:
 //   LR : return address.
 //   SP + 0 : type arguments object (only if class is parameterized).
 void StubCode::GenerateAllocationStubForClass(Assembler* assembler,
                                               const Class& cls) {
   // The generated code is different if the class is parameterized.
   const bool is_cls_parameterized = cls.NumTypeArguments() > 0;
   ASSERT(!is_cls_parameterized ||
          (cls.type_arguments_field_offset() != Class::kNoTypeArguments));
@@ skipping 106 matching lines @@
   }
   __ CallRuntime(kAllocateObjectRuntimeEntry, 2);  // Allocate object.
   __ Drop(2);                                      // Pop arguments.
   __ Pop(R0);  // Pop result (newly allocated object).
   // R0: new object
   // Restore the frame pointer.
   __ LeaveStubFrame();
   __ ret();
 }
 
-
 // Called for invoking "dynamic noSuchMethod(Invocation invocation)" function
 // from the entry code of a dart function after an error in passed argument
 // name or number is detected.
 // Input parameters:
 //  LR : return address.
 //  SP : address of last argument.
 //  R4: arguments descriptor array.
 void StubCode::GenerateCallClosureNoSuchMethodStub(Assembler* assembler) {
   __ EnterStubFrame();
 
@@ skipping 17 matching lines @@
 
   // R2: Smi-tagged arguments array length.
   PushArgumentsArray(assembler);
 
   const intptr_t kNumArgs = 3;
   __ CallRuntime(kInvokeClosureNoSuchMethodRuntimeEntry, kNumArgs);
   // noSuchMethod on closures always throws an error, so it will never return.
   __ brk(0);
 }
 
-
 //  R6: function object.
 //  R5: inline cache data object.
 // Cannot use function object from ICData as it may be the inlined
 // function and not the top-scope function.
 void StubCode::GenerateOptimizedUsageCounterIncrement(Assembler* assembler) {
   Register ic_reg = R5;
   Register func_reg = R6;
   if (FLAG_trace_optimized_ic_calls) {
     __ EnterStubFrame();
     __ Push(R6);        // Preserve.
     __ Push(R5);        // Preserve.
     __ Push(ic_reg);    // Argument.
     __ Push(func_reg);  // Argument.
     __ CallRuntime(kTraceICCallRuntimeEntry, 2);
     __ Drop(2);  // Discard argument;
     __ Pop(R5);  // Restore.
     __ Pop(R6);  // Restore.
     __ LeaveStubFrame();
   }
   __ LoadFieldFromOffset(R7, func_reg, Function::usage_counter_offset(), kWord);
   __ add(R7, R7, Operand(1));
   __ StoreFieldToOffset(R7, func_reg, Function::usage_counter_offset(), kWord);
 }
 
-
 // Loads function into 'temp_reg'.
 void StubCode::GenerateUsageCounterIncrement(Assembler* assembler,
                                              Register temp_reg) {
   if (FLAG_optimization_counter_threshold >= 0) {
     Register ic_reg = R5;
     Register func_reg = temp_reg;
     ASSERT(temp_reg == R6);
     __ Comment("Increment function counter");
     __ LoadFieldFromOffset(func_reg, ic_reg, ICData::owner_offset());
     __ LoadFieldFromOffset(R7, func_reg, Function::usage_counter_offset(),
                            kWord);
     __ AddImmediate(R7, 1);
     __ StoreFieldToOffset(R7, func_reg, Function::usage_counter_offset(),
                           kWord);
   }
 }
 
-
 // Note: R5 must be preserved.
 // Attempt a quick Smi operation for known operations ('kind'). The ICData
 // must have been primed with a Smi/Smi check that will be used for counting
 // the invocations.
 static void EmitFastSmiOp(Assembler* assembler,
                           Token::Kind kind,
                           intptr_t num_args,
                           Label* not_smi_or_overflow) {
   __ Comment("Fast Smi op");
   __ ldr(R0, Address(SP, +0 * kWordSize));  // Right.
@@ skipping 46 matching lines @@
     const intptr_t count_offset = ICData::CountIndexFor(num_args) * kWordSize;
     // Update counter, ignore overflow.
     __ LoadFromOffset(R1, R6, count_offset);
     __ adds(R1, R1, Operand(Smi::RawValue(1)));
     __ StoreToOffset(R1, R6, count_offset);
   }
 
   __ ret();
 }
 
-
 // Generate inline cache check for 'num_args'.
 //  LR: return address.
 //  R5: inline cache data object.
 // Control flow:
 // - If receiver is null -> jump to IC miss.
 // - If receiver is Smi -> load Smi class.
 // - If receiver is not-Smi -> load receiver's class.
 // - Check if 'num_args' (including receiver) match any IC data group.
 // - Match found -> jump to target.
 // - Match not found -> jump to IC miss.
@@ skipping 161 matching lines @@
     __ EnterStubFrame();
     __ Push(R5);  // Preserve IC data.
     __ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
     __ Pop(R5);
     __ RestoreCodePointer();
     __ LeaveStubFrame();
     __ b(&done_stepping);
   }
 }
 
-
 // Use inline cache data array to invoke the target or continue in inline
 // cache miss handler. Stub for 1-argument check (receiver class).
 //  LR: return address.
 //  R5: inline cache data object.
 // Inline cache data object structure:
 // 0: function-name
 // 1: N, number of arguments checked.
 // 2 .. (length - 1): group of checks, each check containing:
 //   - N classes.
 //   - 1 target function.
 void StubCode::GenerateOneArgCheckInlineCacheStub(Assembler* assembler) {
   GenerateUsageCounterIncrement(assembler, R6);
   GenerateNArgsCheckInlineCacheStub(
       assembler, 1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL);
 }
 
-
 void StubCode::GenerateTwoArgsCheckInlineCacheStub(Assembler* assembler) {
   GenerateUsageCounterIncrement(assembler, R6);
   GenerateNArgsCheckInlineCacheStub(assembler, 2,
                                     kInlineCacheMissHandlerTwoArgsRuntimeEntry,
                                     Token::kILLEGAL);
 }
 
-
 void StubCode::GenerateSmiAddInlineCacheStub(Assembler* assembler) {
   GenerateUsageCounterIncrement(assembler, R6);
   GenerateNArgsCheckInlineCacheStub(
       assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kADD);
 }
 
-
 void StubCode::GenerateSmiSubInlineCacheStub(Assembler* assembler) {
   GenerateUsageCounterIncrement(assembler, R6);
   GenerateNArgsCheckInlineCacheStub(
       assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kSUB);
 }
 
-
 void StubCode::GenerateSmiEqualInlineCacheStub(Assembler* assembler) {
   GenerateUsageCounterIncrement(assembler, R6);
   GenerateNArgsCheckInlineCacheStub(
       assembler, 2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kEQ);
 }
 
-
 void StubCode::GenerateOneArgOptimizedCheckInlineCacheStub(
     Assembler* assembler) {
   GenerateOptimizedUsageCounterIncrement(assembler);
   GenerateNArgsCheckInlineCacheStub(assembler, 1,
                                     kInlineCacheMissHandlerOneArgRuntimeEntry,
                                     Token::kILLEGAL, true /* optimized */);
 }
 
-
 void StubCode::GenerateTwoArgsOptimizedCheckInlineCacheStub(
     Assembler* assembler) {
   GenerateOptimizedUsageCounterIncrement(assembler);
   GenerateNArgsCheckInlineCacheStub(assembler, 2,
                                     kInlineCacheMissHandlerTwoArgsRuntimeEntry,
                                     Token::kILLEGAL, true /* optimized */);
 }
 
-
 void StubCode::GenerateZeroArgsUnoptimizedStaticCallStub(Assembler* assembler) {
   GenerateUsageCounterIncrement(assembler, R6);
 #if defined(DEBUG)
   {
     Label ok;
     // Check that the IC data array has NumArgsTested() == 0.
     // 'NumArgsTested' is stored in the least significant bits of 'state_bits'.
     __ LoadFromOffset(R6, R5, ICData::state_bits_offset() - kHeapObjectTag,
                       kUnsignedWord);
     ASSERT(ICData::NumArgsTestedShift() == 0);  // No shift needed.
@@ skipping 44 matching lines @@
     __ EnterStubFrame();
     __ Push(R5);  // Preserve IC data.
     __ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
     __ Pop(R5);
     __ RestoreCodePointer();
     __ LeaveStubFrame();
     __ b(&done_stepping);
   }
 }
 
-
 void StubCode::GenerateOneArgUnoptimizedStaticCallStub(Assembler* assembler) {
   GenerateUsageCounterIncrement(assembler, R6);
   GenerateNArgsCheckInlineCacheStub(
       assembler, 1, kStaticCallMissHandlerOneArgRuntimeEntry, Token::kILLEGAL);
 }
 
-
 void StubCode::GenerateTwoArgsUnoptimizedStaticCallStub(Assembler* assembler) {
   GenerateUsageCounterIncrement(assembler, R6);
   GenerateNArgsCheckInlineCacheStub(
       assembler, 2, kStaticCallMissHandlerTwoArgsRuntimeEntry, Token::kILLEGAL);
 }
 
-
 // Stub for compiling a function and jumping to the compiled code.
 // R5: IC-Data (for methods).
 // R4: Arguments descriptor.
 // R0: Function.
 void StubCode::GenerateLazyCompileStub(Assembler* assembler) {
   // Preserve arg desc. and IC data object.
   __ EnterStubFrame();
   __ Push(R5);  // Save IC Data.
   __ Push(R4);  // Save arg. desc.
   __ Push(R0);  // Pass function.
   __ CallRuntime(kCompileFunctionRuntimeEntry, 1);
   __ Pop(R0);  // Restore argument.
   __ Pop(R4);  // Restore arg desc.
   __ Pop(R5);  // Restore IC Data.
   __ LeaveStubFrame();
 
   __ LoadFieldFromOffset(CODE_REG, R0, Function::code_offset());
   __ LoadFieldFromOffset(R2, R0, Function::entry_point_offset());
   __ br(R2);
 }
 
-
 // R5: Contains an ICData.
 void StubCode::GenerateICCallBreakpointStub(Assembler* assembler) {
   __ EnterStubFrame();
   __ Push(R5);
   __ Push(ZR);  // Space for result.
   __ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
   __ Pop(CODE_REG);
   __ Pop(R5);
   __ LeaveStubFrame();
   __ LoadFieldFromOffset(R0, CODE_REG, Code::entry_point_offset());
   __ br(R0);
 }
 
-
 void StubCode::GenerateRuntimeCallBreakpointStub(Assembler* assembler) {
   __ EnterStubFrame();
   __ Push(ZR);  // Space for result.
   __ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
   __ Pop(CODE_REG);
   __ LeaveStubFrame();
   __ LoadFieldFromOffset(R0, CODE_REG, Code::entry_point_offset());
   __ br(R0);
 }
 
 // Called only from unoptimized code. All relevant registers have been saved.
 void StubCode::GenerateDebugStepCheckStub(Assembler* assembler) {
   // Check single stepping.
   Label stepping, done_stepping;
   __ LoadIsolate(R1);
   __ LoadFromOffset(R1, R1, Isolate::single_step_offset(), kUnsignedByte);
   __ CompareImmediate(R1, 0);
   __ b(&stepping, NE);
   __ Bind(&done_stepping);
 
   __ ret();
 
   __ Bind(&stepping);
   __ EnterStubFrame();
   __ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
   __ LeaveStubFrame();
   __ b(&done_stepping);
 }
 
-
 // Used to check class and type arguments. Arguments passed in registers:
 // LR: return address.
 // R0: instance (must be preserved).
 // R1: instantiator type arguments (only if n == 4, can be raw_null).
 // R2: function type arguments (only if n == 4, can be raw_null).
 // R3: SubtypeTestCache.
 // Result in R1: null -> not found, otherwise result (true or false).
 static void GenerateSubtypeNTestCacheStub(Assembler* assembler, int n) {
   ASSERT((n == 1) || (n == 2) || (n == 4));
   if (n > 1) {
@@ skipping 65 matching lines @@
   // Fall through to not found.
   __ Bind(&not_found);
   __ LoadObject(R1, Object::null_object());
   __ ret();
 
   __ Bind(&found);
   __ LoadFromOffset(R1, R3, kWordSize * SubtypeTestCache::kTestResult);
   __ ret();
 }
 
-
 // Used to check class and type arguments. Arguments passed on stack:
 // LR: return address.
 // R0: instance (must be preserved).
 // R1: unused.
 // R2: unused.
 // R3: SubtypeTestCache.
 // Result in R1: null -> not found, otherwise result (true or false).
 void StubCode::GenerateSubtype1TestCacheStub(Assembler* assembler) {
   GenerateSubtypeNTestCacheStub(assembler, 1);
 }
 
-
 // Used to check class and type arguments. Arguments passed in registers:
 // LR: return address.
 // R0: instance (must be preserved).
 // R1: unused.
 // R2: unused.
 // R3: SubtypeTestCache.
 // Result in R1: null -> not found, otherwise result (true or false).
 void StubCode::GenerateSubtype2TestCacheStub(Assembler* assembler) {
   GenerateSubtypeNTestCacheStub(assembler, 2);
 }
 
-
 // Used to check class and type arguments. Arguments passed on stack:
 // LR: return address.
 // R0: instance (must be preserved).
 // R1: instantiator type arguments (can be raw_null).
 // R2: function type arguments (can be raw_null).
 // R3: SubtypeTestCache.
 // Result in R1: null -> not found, otherwise result (true or false).
 void StubCode::GenerateSubtype4TestCacheStub(Assembler* assembler) {
   GenerateSubtypeNTestCacheStub(assembler, 4);
 }
 
-
 void StubCode::GenerateGetCStackPointerStub(Assembler* assembler) {
   __ mov(R0, CSP);
   __ ret();
 }
 
-
 // Jump to a frame on the call stack.
 // LR: return address.
 // R0: program_counter.
 // R1: stack_pointer.
 // R2: frame_pointer.
 // R3: thread.
 // Does not return.
 void StubCode::GenerateJumpToFrameStub(Assembler* assembler) {
   ASSERT(kExceptionObjectReg == R0);
   ASSERT(kStackTraceObjectReg == R1);
   __ mov(LR, R0);  // Program counter.
   __ mov(SP, R1);  // Stack pointer.
   __ mov(FP, R2);  // Frame_pointer.
   __ mov(THR, R3);
   // Set the tag.
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, THR, Thread::vm_tag_offset());
   // Clear top exit frame.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset());
   // Restore the pool pointer.
   __ RestoreCodePointer();
   __ LoadPoolPointer();
   __ ret();  // Jump to continuation point.
 }
 
-
 // Run an exception handler.  Execution comes from JumpToFrame
 // stub or from the simulator.
 //
 // The arguments are stored in the Thread object.
 // Does not return.
 void StubCode::GenerateRunExceptionHandlerStub(Assembler* assembler) {
   __ LoadFromOffset(LR, THR, Thread::resume_pc_offset());
   __ LoadImmediate(R2, 0);
 
   // Exception object.
   __ LoadFromOffset(R0, THR, Thread::active_exception_offset());
   __ StoreToOffset(R2, THR, Thread::active_exception_offset());
 
   // StackTrace object.
   __ LoadFromOffset(R1, THR, Thread::active_stacktrace_offset());
   __ StoreToOffset(R2, THR, Thread::active_stacktrace_offset());
 
   __ ret();  // Jump to the exception handler code.
 }
 
-
 // Deoptimize a frame on the call stack before rewinding.
 // The arguments are stored in the Thread object.
 // No result.
 void StubCode::GenerateDeoptForRewindStub(Assembler* assembler) {
   // Push zap value instead of CODE_REG.
   __ LoadImmediate(TMP, kZapCodeReg);
   __ Push(TMP);
 
   // Load the deopt pc into LR.
   __ LoadFromOffset(LR, THR, Thread::resume_pc_offset());
   GenerateDeoptimizationSequence(assembler, kEagerDeopt);
 
   // After we have deoptimized, jump to the correct frame.
   __ EnterStubFrame();
   __ CallRuntime(kRewindPostDeoptRuntimeEntry, 0);
   __ LeaveStubFrame();
   __ brk(0);
 }
 
-
 // Calls to the runtime to optimize the given function.
 // R6: function to be re-optimized.
 // R4: argument descriptor (preserved).
 void StubCode::GenerateOptimizeFunctionStub(Assembler* assembler) {
   __ EnterStubFrame();
   __ Push(R4);
   // Setup space on stack for the return value.
   __ Push(ZR);
   __ Push(R6);
   __ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1);
   __ Pop(R0);  // Discard argument.
   __ Pop(R0);  // Get Function object
   __ Pop(R4);  // Restore argument descriptor.
   __ LoadFieldFromOffset(CODE_REG, R0, Function::code_offset());
   __ LoadFieldFromOffset(R1, R0, Function::entry_point_offset());
   __ LeaveStubFrame();
   __ br(R1);
   __ brk(0);
 }
 
-
 // Does identical check (object references are equal or not equal) with special
 // checks for boxed numbers.
 // Left and right are pushed on stack.
 // Return Zero condition flag set if equal.
 // Note: A Mint cannot contain a value that would fit in Smi, a Bigint
 // cannot contain a value that fits in Mint or Smi.
 static void GenerateIdenticalWithNumberCheckStub(Assembler* assembler,
                                                  const Register left,
                                                  const Register right) {
   Label reference_compare, done, check_mint, check_bigint;
@@ skipping 37 matching lines @@
   // Result in R0, 0 means equal.
   __ LeaveStubFrame();
   __ cmp(R0, Operand(0));
   __ b(&done);
 
   __ Bind(&reference_compare);
   __ CompareRegisters(left, right);
   __ Bind(&done);
 }
 
-
 // Called only from unoptimized code. All relevant registers have been saved.
 // LR: return address.
 // SP + 4: left operand.
 // SP + 0: right operand.
 // Return Zero condition flag set if equal.
 void StubCode::GenerateUnoptimizedIdenticalWithNumberCheckStub(
     Assembler* assembler) {
   // Check single stepping.
   Label stepping, done_stepping;
   if (FLAG_support_debugger) {
@@ skipping 14 matching lines @@
   if (FLAG_support_debugger) {
     __ Bind(&stepping);
     __ EnterStubFrame();
     __ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
     __ RestoreCodePointer();
     __ LeaveStubFrame();
     __ b(&done_stepping);
   }
 }
 
-
 // Called from optimized code only.
 // LR: return address.
 // SP + 4: left operand.
 // SP + 0: right operand.
 // Return Zero condition flag set if equal.
 void StubCode::GenerateOptimizedIdenticalWithNumberCheckStub(
     Assembler* assembler) {
   const Register left = R1;
   const Register right = R0;
   __ LoadFromOffset(left, SP, 1 * kWordSize);
   __ LoadFromOffset(right, SP, 0 * kWordSize);
   GenerateIdenticalWithNumberCheckStub(assembler, left, right);
   __ ret();
 }
 
-
 // Called from megamorphic calls.
 //  R0: receiver
 //  R5: MegamorphicCache (preserved)
 // Passed to target:
 //  CODE_REG: target Code
 //  R4: arguments descriptor
 void StubCode::GenerateMegamorphicCallStub(Assembler* assembler) {
   // Jump if receiver is a smi.
   Label smi_case;
   __ TestImmediate(R0, kSmiTagMask);
@@ skipping 52 matching lines @@
   // Try next extry in the table.
   __ AddImmediate(R3, Smi::RawValue(1));
   __ b(&loop);
 
   // Load cid for the Smi case.
   __ Bind(&smi_case);
   __ LoadImmediate(R0, kSmiCid);
   __ b(&cid_loaded);
 }
 
-
 // Called from switchable IC calls.
 //  R0: receiver
 //  R5: ICData (preserved)
 // Passed to target:
 //  CODE_REG: target Code object
 //  R4: arguments descriptor
 void StubCode::GenerateICCallThroughFunctionStub(Assembler* assembler) {
   Label loop, found, miss;
   __ ldr(R4, FieldAddress(R5, ICData::arguments_descriptor_offset()));
   __ ldr(R8, FieldAddress(R5, ICData::ic_data_offset()));
@@ skipping 20 matching lines @@
   __ ldr(CODE_REG, FieldAddress(R0, Function::code_offset()));
   __ br(R1);
 
   __ Bind(&miss);
   __ LoadIsolate(R2);
   __ ldr(CODE_REG, Address(R2, Isolate::ic_miss_code_offset()));
   __ ldr(R1, FieldAddress(CODE_REG, Code::entry_point_offset()));
   __ br(R1);
 }
 
-
 void StubCode::GenerateICCallThroughCodeStub(Assembler* assembler) {
   Label loop, found, miss;
   __ ldr(R4, FieldAddress(R5, ICData::arguments_descriptor_offset()));
   __ ldr(R8, FieldAddress(R5, ICData::ic_data_offset()));
   __ AddImmediate(R8, Array::data_offset() - kHeapObjectTag);
   // R8: first IC entry
   __ LoadTaggedClassIdMayBeSmi(R1, R0);
   // R1: receiver cid as Smi
 
   __ Bind(&loop);
@@ skipping 14 matching lines @@
   __ ldr(CODE_REG, Address(R8, code_offset));
   __ br(R1);
 
   __ Bind(&miss);
   __ LoadIsolate(R2);
   __ ldr(CODE_REG, Address(R2, Isolate::ic_miss_code_offset()));
   __ ldr(R1, FieldAddress(CODE_REG, Code::entry_point_offset()));
   __ br(R1);
 }
 
-
 // Called from switchable IC calls.
 //  R0: receiver
 //  R5: SingleTargetCache
 void StubCode::GenerateUnlinkedCallStub(Assembler* assembler) {
   __ EnterStubFrame();
   __ Push(R0);  // Preserve receiver.
 
   __ Push(ZR);  // Result slot.
   __ Push(R0);  // Arg0: Receiver
   __ Push(R5);  // Arg1: UnlinkedCall
   __ CallRuntime(kUnlinkedCallRuntimeEntry, 2);
   __ Drop(2);
   __ Pop(R5);  // result = IC
 
   __ Pop(R0);  // Restore receiver.
   __ LeaveStubFrame();
 
   __ ldr(CODE_REG, Address(THR, Thread::ic_lookup_through_code_stub_offset()));
   __ ldr(R1, FieldAddress(CODE_REG, Code::checked_entry_point_offset()));
   __ br(R1);
 }
 
-
 // Called from switchable IC calls.
 //  R0: receiver
 //  R5: SingleTargetCache
 // Passed to target:
 //  CODE_REG: target Code object
 void StubCode::GenerateSingleTargetCallStub(Assembler* assembler) {
   Label miss;
   __ LoadClassIdMayBeSmi(R1, R0);
   __ ldr(R2, FieldAddress(R5, SingleTargetCache::lower_limit_offset()),
          kUnsignedHalfword);
@@ skipping 20 matching lines @@
   __ Pop(R5);  // result = IC
 
   __ Pop(R0);  // Restore receiver.
   __ LeaveStubFrame();
 
   __ ldr(CODE_REG, Address(THR, Thread::ic_lookup_through_code_stub_offset()));
   __ ldr(R1, FieldAddress(CODE_REG, Code::checked_entry_point_offset()));
   __ br(R1);
 }
 
-
 // Called from the monomorphic checked entry.
 //  R0: receiver
 void StubCode::GenerateMonomorphicMissStub(Assembler* assembler) {
   __ ldr(CODE_REG, Address(THR, Thread::monomorphic_miss_stub_offset()));
   __ EnterStubFrame();
   __ Push(R0);  // Preserve receiver.
 
   __ Push(ZR);  // Result slot.
   __ Push(R0);  // Arg0: Receiver
   __ CallRuntime(kMonomorphicMissRuntimeEntry, 1);
   __ Drop(1);
   __ Pop(R5);  // result = IC
 
   __ Pop(R0);  // Restore receiver.
   __ LeaveStubFrame();
 
   __ ldr(CODE_REG, Address(THR, Thread::ic_lookup_through_code_stub_offset()));
   __ ldr(R1, FieldAddress(CODE_REG, Code::checked_entry_point_offset()));
   __ br(R1);
 }
 
-
 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
   __ brk(0);
 }
 
-
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ brk(0);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64