src/arm/lithium-codegen-arm.h

   1 // Copyright 2012 the V8 project authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef V8_ARM_LITHIUM_CODEGEN_ARM_H_
   6 #define V8_ARM_LITHIUM_CODEGEN_ARM_H_
   7
   8 #include "src/arm/lithium-arm.h"
   9
  10 #include "src/arm/lithium-gap-resolver-arm.h"
  11 #include "src/deoptimizer.h"
  12 #include "src/lithium-codegen.h"
  13 #include "src/safepoint-table.h"
  14 #include "src/scopes.h"
  15 #include "src/utils.h"
  16
  17 namespace v8 {
  18 namespace internal {
  19
  20 // Forward declarations.
  21 class LDeferredCode;
  22 class SafepointGenerator;
  23
  24 class LCodeGen: public LCodeGenBase {
  25  public:
  26   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
  27       : LCodeGenBase(chunk, assembler, info),
  28         deoptimizations_(4, info->zone()),
  29         jump_table_(4, info->zone()),
  30         inlined_function_count_(0),
  31         scope_(info->scope()),
  32         translations_(info->zone()),
  33         deferred_(8, info->zone()),
  34         osr_pc_offset_(-1),
  35         frame_is_built_(false),
  36         safepoints_(info->zone()),
  37         resolver_(this),
  38         expected_safepoint_kind_(Safepoint::kSimple) {
  39     PopulateDeoptimizationLiteralsWithInlinedFunctions();
  40   }
  41
  42
  43   int LookupDestination(int block_id) const {
  44     return chunk()->LookupDestination(block_id);
  45   }
  46
  47   bool IsNextEmittedBlock(int block_id) const {
  48     return LookupDestination(block_id) == GetNextEmittedBlock();
  49   }
  50
  51   bool NeedsEagerFrame() const {
  52     return GetStackSlotCount() > 0 ||
  53         info()->is_non_deferred_calling() ||
  54         !info()->IsStub() ||
  55         info()->requires_frame();
  56   }
  57   bool NeedsDeferredFrame() const {
  58     return !NeedsEagerFrame() && info()->is_deferred_calling();
  59   }
  60
  61   LinkRegisterStatus GetLinkRegisterState() const {
  62     return frame_is_built_ ? kLRHasBeenSaved : kLRHasNotBeenSaved;
  63   }
  64
  65   // Support for converting LOperands to assembler types.
  66   // LOperand must be a register.
  67   Register ToRegister(LOperand* op) const;
  68
  69   // LOperand is loaded into scratch, unless already a register.
  70   Register EmitLoadRegister(LOperand* op, Register scratch);
  71
  72   // LOperand must be a double register.
  73   DwVfpRegister ToDoubleRegister(LOperand* op) const;
  74
  75   // LOperand is loaded into dbl_scratch, unless already a double register.
  76   DwVfpRegister EmitLoadDoubleRegister(LOperand* op,
  77                                        SwVfpRegister flt_scratch,
  78                                        DwVfpRegister dbl_scratch);
  79   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
  80   int32_t ToInteger32(LConstantOperand* op) const;
  81   Smi* ToSmi(LConstantOperand* op) const;
  82   double ToDouble(LConstantOperand* op) const;
  83   Operand ToOperand(LOperand* op);
  84   MemOperand ToMemOperand(LOperand* op) const;
  85   // Returns a MemOperand pointing to the high word of a DoubleStackSlot.
  86   MemOperand ToHighMemOperand(LOperand* op) const;
  87
  88   bool IsInteger32(LConstantOperand* op) const;
  89   bool IsSmi(LConstantOperand* op) const;
  90   Handle<Object> ToHandle(LConstantOperand* op) const;
  91
  92   // Try to generate code for the entire chunk, but it may fail if the
  93   // chunk contains constructs we cannot handle. Returns true if the
  94   // code generation attempt succeeded.
  95   bool GenerateCode();
  96
  97   // Finish the code by setting stack height, safepoint, and bailout
  98   // information on it.
  99   void FinishCode(Handle<Code> code);
 100
 101   // Deferred code support.
 102   void DoDeferredNumberTagD(LNumberTagD* instr);
 103
 104   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
 105   void DoDeferredNumberTagIU(LInstruction* instr,
 106                              LOperand* value,
 107                              LOperand* temp1,
 108                              LOperand* temp2,
 109                              IntegerSignedness signedness);
 110
 111   void DoDeferredTaggedToI(LTaggedToI* instr);
 112   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
 113   void DoDeferredStackCheck(LStackCheck* instr);
 114   void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
 115   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 116   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 117   void DoDeferredAllocate(LAllocate* instr);
 118   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 119   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 120                                    Register result,
 121                                    Register object,
 122                                    Register index);
 123
 124   // Parallel move support.
 125   void DoParallelMove(LParallelMove* move);
 126   void DoGap(LGap* instr);
 127
 128   MemOperand PrepareKeyedOperand(Register key,
 129                                  Register base,
 130                                  bool key_is_constant,
 131                                  int constant_key,
 132                                  int element_size,
 133                                  int shift_size,
 134                                  int base_offset);
 135
 136   // Emit frame translation commands for an environment.
 137   void WriteTranslation(LEnvironment* environment, Translation* translation);
 138
 139   // Declare methods that deal with the individual node types.
 140 #define DECLARE_DO(type) void Do##type(L##type* node);
 141   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 142 #undef DECLARE_DO
 143
 144  private:
 145   LanguageMode language_mode() const { return info()->language_mode(); }
 146
 147   Scope* scope() const { return scope_; }
 148
 149   Register scratch0() { return r9; }
 150   LowDwVfpRegister double_scratch0() { return kScratchDoubleReg; }
 151
 152   LInstruction* GetNextInstruction();
 153
 154   void EmitClassOfTest(Label* if_true,
 155                        Label* if_false,
 156                        Handle<String> class_name,
 157                        Register input,
 158                        Register temporary,
 159                        Register temporary2);
 160
 161   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 162
 163   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 164
 165   void SaveCallerDoubles();
 166   void RestoreCallerDoubles();
 167
 168   // Code generation passes.  Returns true if code generation should
 169   // continue.
 170   void GenerateBodyInstructionPre(LInstruction* instr) override;
 171   bool GeneratePrologue();
 172   bool GenerateDeferredCode();
 173   bool GenerateJumpTable();
 174   bool GenerateSafepointTable();
 175
 176   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 177   void GenerateOsrPrologue();
 178
 179   enum SafepointMode {
 180     RECORD_SIMPLE_SAFEPOINT,
 181     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 182   };
 183
 184   int CallCodeSize(Handle<Code> code, RelocInfo::Mode mode);
 185
 186   void CallCode(
 187       Handle<Code> code,
 188       RelocInfo::Mode mode,
 189       LInstruction* instr,
 190       TargetAddressStorageMode storage_mode = CAN_INLINE_TARGET_ADDRESS);
 191
 192   void CallCodeGeneric(
 193       Handle<Code> code,
 194       RelocInfo::Mode mode,
 195       LInstruction* instr,
 196       SafepointMode safepoint_mode,
 197       TargetAddressStorageMode storage_mode = CAN_INLINE_TARGET_ADDRESS);
 198
 199   void CallRuntime(const Runtime::Function* function,
 200                    int num_arguments,
 201                    LInstruction* instr,
 202                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 203
 204   void CallRuntime(Runtime::FunctionId id,
 205                    int num_arguments,
 206                    LInstruction* instr) {
 207     const Runtime::Function* function = Runtime::FunctionForId(id);
 208     CallRuntime(function, num_arguments, instr);
 209   }
 210
 211   void LoadContextFromDeferred(LOperand* context);
 212   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 213                                int argc,
 214                                LInstruction* instr,
 215                                LOperand* context);
 216
 217   // Generate a direct call to a known function.  Expects the function
 218   // to be in r1.
 219   void CallKnownFunction(Handle<JSFunction> function,
 220                          int formal_parameter_count, int arity,
 221                          LInstruction* instr);
 222
 223   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 224                                     SafepointMode safepoint_mode);
 225
 226   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 227                                             Safepoint::DeoptMode mode);
 228   void DeoptimizeIf(Condition condition, LInstruction* instr,
 229                     Deoptimizer::DeoptReason deopt_reason,
 230                     Deoptimizer::BailoutType bailout_type);
 231   void DeoptimizeIf(Condition condition, LInstruction* instr,
 232                     Deoptimizer::DeoptReason deopt_reason);
 233
 234   void AddToTranslation(LEnvironment* environment,
 235                         Translation* translation,
 236                         LOperand* op,
 237                         bool is_tagged,
 238                         bool is_uint32,
 239                         int* object_index_pointer,
 240                         int* dematerialized_index_pointer);
 241   void PopulateDeoptimizationData(Handle<Code> code);
 242
 243   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 244
 245   Register ToRegister(int index) const;
 246   DwVfpRegister ToDoubleRegister(int index) const;
 247
 248   MemOperand BuildSeqStringOperand(Register string,
 249                                    LOperand* index,
 250                                    String::Encoding encoding);
 251
 252   void EmitIntegerMathAbs(LMathAbs* instr);
 253
 254   // Support for recording safepoint and position information.
 255   void RecordSafepoint(LPointerMap* pointers,
 256                        Safepoint::Kind kind,
 257                        int arguments,
 258                        Safepoint::DeoptMode mode);
 259   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 260   void RecordSafepoint(Safepoint::DeoptMode mode);
 261   void RecordSafepointWithRegisters(LPointerMap* pointers,
 262                                     int arguments,
 263                                     Safepoint::DeoptMode mode);
 264
 265   void RecordAndWritePosition(int position) override;
 266
 267   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 268   void EmitGoto(int block);
 269
 270   // EmitBranch expects to be the last instruction of a block.
 271   template<class InstrType>
 272   void EmitBranch(InstrType instr, Condition condition);
 273   template <class InstrType>
 274   void EmitTrueBranch(InstrType instr, Condition condition);
 275   template <class InstrType>
 276   void EmitFalseBranch(InstrType instr, Condition condition);
 277   void EmitNumberUntagD(LNumberUntagD* instr, Register input,
 278                         DwVfpRegister result, NumberUntagDMode mode);
 279
 280   // Emits optimized code for typeof x == "y".  Modifies input register.
 281   // Returns the condition on which a final split to
 282   // true and false label should be made, to optimize fallthrough.
 283   Condition EmitTypeofIs(Label* true_label,
 284                          Label* false_label,
 285                          Register input,
 286                          Handle<String> type_name);
 287
 288   // Emits optimized code for %_IsString(x).  Preserves input register.
 289   // Returns the condition on which a final split to
 290   // true and false label should be made, to optimize fallthrough.
 291   Condition EmitIsString(Register input,
 292                          Register temp1,
 293                          Label* is_not_string,
 294                          SmiCheck check_needed);
 295
 296   // Emits optimized code for %_IsConstructCall().
 297   // Caller should branch on equal condition.
 298   void EmitIsConstructCall(Register temp1, Register temp2);
 299
 300   // Emits optimized code to deep-copy the contents of statically known
 301   // object graphs (e.g. object literal boilerplate).
 302   void EmitDeepCopy(Handle<JSObject> object,
 303                     Register result,
 304                     Register source,
 305                     int* offset,
 306                     AllocationSiteMode mode);
 307
 308   void EnsureSpaceForLazyDeopt(int space_needed) override;
 309   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 310   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 311   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 312   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 313   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 314   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 315
 316   template <class T>
 317   void EmitVectorLoadICRegisters(T* instr);
 318   template <class T>
 319   void EmitVectorStoreICRegisters(T* instr);
 320
 321   ZoneList<LEnvironment*> deoptimizations_;
 322   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 323   int inlined_function_count_;
 324   Scope* const scope_;
 325   TranslationBuffer translations_;
 326   ZoneList<LDeferredCode*> deferred_;
 327   int osr_pc_offset_;
 328   bool frame_is_built_;
 329
 330   // Builder that keeps track of safepoints in the code. The table
 331   // itself is emitted at the end of the generated code.
 332   SafepointTableBuilder safepoints_;
 333
 334   // Compiler from a set of parallel moves to a sequential list of moves.
 335   LGapResolver resolver_;
 336
 337   Safepoint::Kind expected_safepoint_kind_;
 338
 339   class PushSafepointRegistersScope final BASE_EMBEDDED {
 340    public:
 341     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 342         : codegen_(codegen) {
 343       DCHECK(codegen_->info()->is_calling());
 344       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 345       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 346       codegen_->masm_->PushSafepointRegisters();
 347     }
 348
 349     ~PushSafepointRegistersScope() {
 350       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 351       codegen_->masm_->PopSafepointRegisters();
 352       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 353     }
 354
 355    private:
 356     LCodeGen* codegen_;
 357   };
 358
 359   friend class LDeferredCode;
 360   friend class LEnvironment;
 361   friend class SafepointGenerator;
 362   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 363 };
 364
 365
 366 class LDeferredCode : public ZoneObject {
 367  public:
 368   explicit LDeferredCode(LCodeGen* codegen)
 369       : codegen_(codegen),
 370         external_exit_(NULL),
 371         instruction_index_(codegen->current_instruction_) {
 372     codegen->AddDeferredCode(this);
 373   }
 374
 375   virtual ~LDeferredCode() {}
 376   virtual void Generate() = 0;
 377   virtual LInstruction* instr() = 0;
 378
 379   void SetExit(Label* exit) { external_exit_ = exit; }
 380   Label* entry() { return &entry_; }
 381   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 382   int instruction_index() const { return instruction_index_; }
 383
 384  protected:
 385   LCodeGen* codegen() const { return codegen_; }
 386   MacroAssembler* masm() const { return codegen_->masm(); }
 387
 388  private:
 389   LCodeGen* codegen_;
 390   Label entry_;
 391   Label exit_;
 392   Label* external_exit_;
 393   int instruction_index_;
 394 };
 395
 396 } }  // namespace v8::internal
 397
 398 #endif  // V8_ARM_LITHIUM_CODEGEN_ARM_H_