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

runtime/vm/instructions_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"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/instructions.h"
 #include "vm/instructions_arm64.h"
 
@@ skipping 13 matching lines @@
   ASSERT(code.ContainsInstructionAt(pc));
   // Last instruction: blr ip0.
   ASSERT(*(reinterpret_cast<uint32_t*>(end_) - 1) == 0xd63f0200);
 
   Register reg;
   ic_data_load_end_ = InstructionPattern::DecodeLoadWordFromPool(
       end_ - 2 * Instr::kInstrSize, &reg, &target_code_pool_index_);
   ASSERT(reg == CODE_REG);
 }
 
-
 NativeCallPattern::NativeCallPattern(uword pc, const Code& code)
     : object_pool_(ObjectPool::Handle(code.GetObjectPool())),
       end_(pc),
       native_function_pool_index_(-1),
       target_code_pool_index_(-1) {
   ASSERT(code.ContainsInstructionAt(pc));
   // Last instruction: blr ip0.
   ASSERT(*(reinterpret_cast<uint32_t*>(end_) - 1) == 0xd63f0200);
 
   Register reg;
   uword native_function_load_end = InstructionPattern::DecodeLoadWordFromPool(
       end_ - 2 * Instr::kInstrSize, &reg, &target_code_pool_index_);
   ASSERT(reg == CODE_REG);
   InstructionPattern::DecodeLoadWordFromPool(native_function_load_end, &reg,
                                              &native_function_pool_index_);
   ASSERT(reg == R5);
 }
 
-
 RawCode* NativeCallPattern::target() const {
   return reinterpret_cast<RawCode*>(
       object_pool_.ObjectAt(target_code_pool_index_));
 }
 
-
 void NativeCallPattern::set_target(const Code& target) const {
   object_pool_.SetObjectAt(target_code_pool_index_, target);
   // No need to flush the instruction cache, since the code is not modified.
 }
 
-
 NativeFunction NativeCallPattern::native_function() const {
   return reinterpret_cast<NativeFunction>(
       object_pool_.RawValueAt(native_function_pool_index_));
 }
 
-
 void NativeCallPattern::set_native_function(NativeFunction func) const {
   object_pool_.SetRawValueAt(native_function_pool_index_,
                              reinterpret_cast<uword>(func));
 }
 
-
 intptr_t InstructionPattern::OffsetFromPPIndex(intptr_t index) {
   return Array::element_offset(index);
 }
 
-
 // Decodes a load sequence ending at 'end' (the last instruction of the load
 // sequence is the instruction before the one at end).  Returns a pointer to
 // the first instruction in the sequence.  Returns the register being loaded
 // and the loaded object in the output parameters 'reg' and 'obj'
 // respectively.
 uword InstructionPattern::DecodeLoadObject(uword end,
                                            const ObjectPool& object_pool,
                                            Register* reg,
                                            Object* obj) {
   // 1. LoadWordFromPool
   // or
   // 2. LoadDecodableImmediate
   uword start = 0;
   Instr* instr = Instr::At(end - Instr::kInstrSize);
   if (instr->IsLoadStoreRegOp()) {
     // Case 1.
     intptr_t index = 0;
     start = DecodeLoadWordFromPool(end, reg, &index);
     *obj = object_pool.ObjectAt(index);
   } else {
     // Case 2.
     intptr_t value = 0;
     start = DecodeLoadWordImmediate(end, reg, &value);
     *obj = reinterpret_cast<RawObject*>(value);
   }
   return start;
 }
 
-
 // Decodes a load sequence ending at 'end' (the last instruction of the load
 // sequence is the instruction before the one at end).  Returns a pointer to
 // the first instruction in the sequence.  Returns the register being loaded
 // and the loaded immediate value in the output parameters 'reg' and 'value'
 // respectively.
 uword InstructionPattern::DecodeLoadWordImmediate(uword end,
                                                   Register* reg,
                                                   intptr_t* value) {
   // 1. LoadWordFromPool
   // or
@@ skipping 53 matching lines @@
   instr = Instr::At(start);
   ASSERT(instr->IsMoveWideOp());
   ASSERT(instr->Bits(29, 2) == 2);
   ASSERT(instr->HWField() == 0);  // movz dst, imm0, 0
   ASSERT(instr->RdField() == *reg);
   *value |= static_cast<int64_t>(instr->Imm16Field());
 
   return start;
 }
 
-
 // Decodes a load sequence ending at 'end' (the last instruction of the load
 // sequence is the instruction before the one at end).  Returns a pointer to
 // the first instruction in the sequence.  Returns the register being loaded
 // and the index in the pool being read from in the output parameters 'reg'
 // and 'index' respectively.
 uword InstructionPattern::DecodeLoadWordFromPool(uword end,
                                                  Register* reg,
                                                  intptr_t* index) {
   // 1. ldr dst, [pp, offset]
   // or
@@ skipping 52 matching lines @@
       ASSERT(instr->HWField() == 0);
       offset |= instr->Imm16Field();
     }
   }
   // PP is untagged on ARM64.
   ASSERT(Utils::IsAligned(offset, 8));
   *index = ObjectPool::IndexFromOffset(offset - kHeapObjectTag);
   return start;
 }
 
-
 bool DecodeLoadObjectFromPoolOrThread(uword pc, const Code& code, Object* obj) {
   ASSERT(code.ContainsInstructionAt(pc));
 
   Instr* instr = Instr::At(pc);
   if (instr->IsLoadStoreRegOp() && (instr->Bit(22) == 1) &&
       (instr->Bits(30, 2) == 3) && instr->Bit(24) == 1) {
     intptr_t offset = (instr->Imm12Field() << 3);
     if (instr->RnField() == PP) {
       // PP is untagged on ARM64.
       ASSERT(Utils::IsAligned(offset, 8));
       intptr_t index = ObjectPool::IndexFromOffset(offset - kHeapObjectTag);
       const ObjectPool& pool = ObjectPool::Handle(code.object_pool());
       if (pool.InfoAt(index) == ObjectPool::kTaggedObject) {
         *obj = pool.ObjectAt(index);
         return true;
       }
     } else if (instr->RnField() == THR) {
       return Thread::ObjectAtOffset(offset, obj);
     }
   }
   // TODO(rmacnak): Loads with offsets beyond 12 bits.
 
   return false;
 }
 
-
 // Encodes a load sequence ending at 'end'. Encodes a fixed length two
 // instruction load from the pool pointer in PP using the destination
 // register reg as a temporary for the base address.
 // Assumes that the location has already been validated for patching.
 void InstructionPattern::EncodeLoadWordFromPoolFixed(uword end,
                                                      int32_t offset) {
   uword start = end - Instr::kInstrSize;
   Instr* instr = Instr::At(start);
   const int32_t upper12 = offset & 0x00fff000;
   const int32_t lower12 = offset & 0x00000fff;
   ASSERT((offset & 0xff000000) == 0);        // Can't encode > 24 bits.
   ASSERT(((lower12 >> 3) << 3) == lower12);  // 8-byte aligned.
   instr->SetImm12Bits(instr->InstructionBits(), lower12 >> 3);
 
   start -= Instr::kInstrSize;
   instr = Instr::At(start);
   instr->SetImm12Bits(instr->InstructionBits(), upper12 >> 12);
   instr->SetInstructionBits(instr->InstructionBits() | B22);
 }
 
-
 RawICData* CallPattern::IcData() {
   if (ic_data_.IsNull()) {
     Register reg;
     InstructionPattern::DecodeLoadObject(ic_data_load_end_, object_pool_, &reg,
                                          &ic_data_);
     ASSERT(reg == R5);
   }
   return ic_data_.raw();
 }
 
-
 RawCode* CallPattern::TargetCode() const {
   return reinterpret_cast<RawCode*>(
       object_pool_.ObjectAt(target_code_pool_index_));
 }
 
-
 void CallPattern::SetTargetCode(const Code& target) const {
   object_pool_.SetObjectAt(target_code_pool_index_, target);
   // No need to flush the instruction cache, since the code is not modified.
 }
 
-
 SwitchableCallPattern::SwitchableCallPattern(uword pc, const Code& code)
     : object_pool_(ObjectPool::Handle(code.GetObjectPool())),
       data_pool_index_(-1),
       target_pool_index_(-1) {
   ASSERT(code.ContainsInstructionAt(pc));
   // Last instruction: blr ip0.
   ASSERT(*(reinterpret_cast<uint32_t*>(pc) - 1) == 0xd63f0200);
 
   Register reg;
   uword data_load_end = InstructionPattern::DecodeLoadWordFromPool(
       pc - Instr::kInstrSize, &reg, &data_pool_index_);
   ASSERT(reg == R5);
   InstructionPattern::DecodeLoadWordFromPool(data_load_end - Instr::kInstrSize,
                                              &reg, &target_pool_index_);
   ASSERT(reg == CODE_REG);
 }
 
-
 RawObject* SwitchableCallPattern::data() const {
   return object_pool_.ObjectAt(data_pool_index_);
 }
 
-
 RawCode* SwitchableCallPattern::target() const {
   return reinterpret_cast<RawCode*>(object_pool_.ObjectAt(target_pool_index_));
 }
 
-
 void SwitchableCallPattern::SetData(const Object& data) const {
   ASSERT(!Object::Handle(object_pool_.ObjectAt(data_pool_index_)).IsCode());
   object_pool_.SetObjectAt(data_pool_index_, data);
 }
 
-
 void SwitchableCallPattern::SetTarget(const Code& target) const {
   ASSERT(Object::Handle(object_pool_.ObjectAt(target_pool_index_)).IsCode());
   object_pool_.SetObjectAt(target_pool_index_, target);
 }
 
-
 ReturnPattern::ReturnPattern(uword pc) : pc_(pc) {}
 
-
 bool ReturnPattern::IsValid() const {
   Instr* bx_lr = Instr::At(pc_);
   const Register crn = ConcreteRegister(LR);
   const int32_t instruction = RET | (static_cast<int32_t>(crn) << kRnShift);
   return bx_lr->InstructionBits() == instruction;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64