src/mips64/lithium-codegen-mips64.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_MIPS_LITHIUM_CODEGEN_MIPS_H_
   6 #define V8_MIPS_LITHIUM_CODEGEN_MIPS_H_
   7
   8 #include "src/deoptimizer.h"
   9 #include "src/lithium-codegen.h"
  10 #include "src/mips64/lithium-gap-resolver-mips64.h"
  11 #include "src/mips64/lithium-mips64.h"
  12 #include "src/safepoint-table.h"
  13 #include "src/scopes.h"
  14 #include "src/utils.h"
  15
  16 namespace v8 {
  17 namespace internal {
  18
  19 // Forward declarations.
  20 class LDeferredCode;
  21 class SafepointGenerator;
  22
  23 class LCodeGen: public LCodeGenBase {
  24  public:
  25   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
  26       : LCodeGenBase(chunk, assembler, info),
  27         deoptimizations_(4, info->zone()),
  28         jump_table_(4, info->zone()),
  29         inlined_function_count_(0),
  30         scope_(info->scope()),
  31         translations_(info->zone()),
  32         deferred_(8, info->zone()),
  33         osr_pc_offset_(-1),
  34         frame_is_built_(false),
  35         safepoints_(info->zone()),
  36         resolver_(this),
  37         expected_safepoint_kind_(Safepoint::kSimple) {
  38     PopulateDeoptimizationLiteralsWithInlinedFunctions();
  39   }
  40
  41
  42   int LookupDestination(int block_id) const {
  43     return chunk()->LookupDestination(block_id);
  44   }
  45
  46   bool IsNextEmittedBlock(int block_id) const {
  47     return LookupDestination(block_id) == GetNextEmittedBlock();
  48   }
  49
  50   bool NeedsEagerFrame() const {
  51     return GetStackSlotCount() > 0 ||
  52         info()->is_non_deferred_calling() ||
  53         !info()->IsStub() ||
  54         info()->requires_frame();
  55   }
  56   bool NeedsDeferredFrame() const {
  57     return !NeedsEagerFrame() && info()->is_deferred_calling();
  58   }
  59
  60   RAStatus GetRAState() const {
  61     return frame_is_built_ ? kRAHasBeenSaved : kRAHasNotBeenSaved;
  62   }
  63
  64   // Support for converting LOperands to assembler types.
  65   // LOperand must be a register.
  66   Register ToRegister(LOperand* op) const;
  67
  68   // LOperand is loaded into scratch, unless already a register.
  69   Register EmitLoadRegister(LOperand* op, Register scratch);
  70
  71   // LOperand must be a double register.
  72   DoubleRegister ToDoubleRegister(LOperand* op) const;
  73
  74   // LOperand is loaded into dbl_scratch, unless already a double register.
  75   DoubleRegister EmitLoadDoubleRegister(LOperand* op,
  76                                         FloatRegister flt_scratch,
  77                                         DoubleRegister dbl_scratch);
  78   int64_t ToRepresentation_donotuse(LConstantOperand* op,
  79                                     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   void DoDeferredNumberTagD(LNumberTagD* instr);
 102
 103   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
 104   void DoDeferredNumberTagIU(LInstruction* instr,
 105                              LOperand* value,
 106                              LOperand* temp1,
 107                              LOperand* temp2,
 108                              IntegerSignedness signedness);
 109
 110   void DoDeferredTaggedToI(LTaggedToI* instr);
 111   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
 112   void DoDeferredStackCheck(LStackCheck* instr);
 113   void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
 114   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 115   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 116   void DoDeferredAllocate(LAllocate* instr);
 117
 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 kLithiumScratchReg; }
 150   Register scratch1() { return kLithiumScratchReg2; }
 151   DoubleRegister double_scratch0() { return kLithiumScratchDouble; }
 152
 153   LInstruction* GetNextInstruction();
 154
 155   void EmitClassOfTest(Label* if_true,
 156                        Label* if_false,
 157                        Handle<String> class_name,
 158                        Register input,
 159                        Register temporary,
 160                        Register temporary2);
 161
 162   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 163
 164   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 165
 166   void SaveCallerDoubles();
 167   void RestoreCallerDoubles();
 168
 169   // Code generation passes.  Returns true if code generation should
 170   // continue.
 171   void GenerateBodyInstructionPre(LInstruction* instr) override;
 172   bool GeneratePrologue();
 173   bool GenerateDeferredCode();
 174   bool GenerateJumpTable();
 175   bool GenerateSafepointTable();
 176
 177   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 178   void GenerateOsrPrologue();
 179
 180   enum SafepointMode {
 181     RECORD_SIMPLE_SAFEPOINT,
 182     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 183   };
 184
 185   void CallCode(Handle<Code> code,
 186                 RelocInfo::Mode mode,
 187                 LInstruction* instr);
 188
 189   void CallCodeGeneric(Handle<Code> code,
 190                        RelocInfo::Mode mode,
 191                        LInstruction* instr,
 192                        SafepointMode safepoint_mode);
 193
 194   void CallRuntime(const Runtime::Function* function,
 195                    int num_arguments,
 196                    LInstruction* instr,
 197                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 198
 199   void CallRuntime(Runtime::FunctionId id,
 200                    int num_arguments,
 201                    LInstruction* instr) {
 202     const Runtime::Function* function = Runtime::FunctionForId(id);
 203     CallRuntime(function, num_arguments, instr);
 204   }
 205
 206   void LoadContextFromDeferred(LOperand* context);
 207   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 208                                int argc,
 209                                LInstruction* instr,
 210                                LOperand* context);
 211
 212   // Generate a direct call to a known function.  Expects the function
 213   // to be in a1.
 214   void CallKnownFunction(Handle<JSFunction> function,
 215                          int formal_parameter_count, int arity,
 216                          LInstruction* instr);
 217
 218   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 219                                     SafepointMode safepoint_mode);
 220
 221   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 222                                             Safepoint::DeoptMode mode);
 223   void DeoptimizeIf(Condition condition, LInstruction* instr,
 224                     Deoptimizer::DeoptReason deopt_reason,
 225                     Deoptimizer::BailoutType bailout_type,
 226                     Register src1 = zero_reg,
 227                     const Operand& src2 = Operand(zero_reg));
 228   void DeoptimizeIf(
 229       Condition condition, LInstruction* instr,
 230       Deoptimizer::DeoptReason deopt_reason = Deoptimizer::kNoReason,
 231       Register src1 = zero_reg, const Operand& src2 = Operand(zero_reg));
 232
 233   void AddToTranslation(LEnvironment* environment,
 234                         Translation* translation,
 235                         LOperand* op,
 236                         bool is_tagged,
 237                         bool is_uint32,
 238                         int* object_index_pointer,
 239                         int* dematerialized_index_pointer);
 240   void PopulateDeoptimizationData(Handle<Code> code);
 241
 242   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 243
 244   Register ToRegister(int index) const;
 245   DoubleRegister ToDoubleRegister(int index) const;
 246
 247   MemOperand BuildSeqStringOperand(Register string,
 248                                    LOperand* index,
 249                                    String::Encoding encoding);
 250
 251   void EmitIntegerMathAbs(LMathAbs* instr);
 252   void EmitSmiMathAbs(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,
 273                   Condition condition,
 274                   Register src1,
 275                   const Operand& src2);
 276   template<class InstrType>
 277   void EmitBranchF(InstrType instr,
 278                    Condition condition,
 279                    FPURegister src1,
 280                    FPURegister src2);
 281   template <class InstrType>
 282   void EmitTrueBranch(InstrType instr, Condition condition, Register src1,
 283                       const Operand& src2);
 284   template <class InstrType>
 285   void EmitFalseBranch(InstrType instr, Condition condition, Register src1,
 286                        const Operand& src2);
 287   template<class InstrType>
 288   void EmitFalseBranchF(InstrType instr,
 289                         Condition condition,
 290                         FPURegister src1,
 291                         FPURegister src2);
 292   void EmitCmpI(LOperand* left, LOperand* right);
 293   void EmitNumberUntagD(LNumberUntagD* instr, Register input,
 294                         DoubleRegister result, NumberUntagDMode mode);
 295
 296   // Emits optimized code for typeof x == "y".  Modifies input register.
 297   // Returns the condition on which a final split to
 298   // true and false label should be made, to optimize fallthrough.
 299   // Returns two registers in cmp1 and cmp2 that can be used in the
 300   // Branch instruction after EmitTypeofIs.
 301   Condition EmitTypeofIs(Label* true_label,
 302                          Label* false_label,
 303                          Register input,
 304                          Handle<String> type_name,
 305                          Register* cmp1,
 306                          Operand* cmp2);
 307
 308   // Emits optimized code for %_IsString(x).  Preserves input register.
 309   // Returns the condition on which a final split to
 310   // true and false label should be made, to optimize fallthrough.
 311   Condition EmitIsString(Register input,
 312                          Register temp1,
 313                          Label* is_not_string,
 314                          SmiCheck check_needed);
 315
 316   // Emits optimized code for %_IsConstructCall().
 317   // Caller should branch on equal condition.
 318   void EmitIsConstructCall(Register temp1, Register temp2);
 319
 320   // Emits optimized code to deep-copy the contents of statically known
 321   // object graphs (e.g. object literal boilerplate).
 322   void EmitDeepCopy(Handle<JSObject> object,
 323                     Register result,
 324                     Register source,
 325                     int* offset,
 326                     AllocationSiteMode mode);
 327   // Emit optimized code for integer division.
 328   // Inputs are signed.
 329   // All registers are clobbered.
 330   // If 'remainder' is no_reg, it is not computed.
 331   void EmitSignedIntegerDivisionByConstant(Register result,
 332                                            Register dividend,
 333                                            int32_t divisor,
 334                                            Register remainder,
 335                                            Register scratch,
 336                                            LEnvironment* environment);
 337
 338
 339   void EnsureSpaceForLazyDeopt(int space_needed) override;
 340   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 341   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 342   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 343   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 344   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 345   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 346
 347   template <class T>
 348   void EmitVectorLoadICRegisters(T* instr);
 349   template <class T>
 350   void EmitVectorStoreICRegisters(T* instr);
 351
 352   ZoneList<LEnvironment*> deoptimizations_;
 353   ZoneList<Deoptimizer::JumpTableEntry*> jump_table_;
 354   int inlined_function_count_;
 355   Scope* const scope_;
 356   TranslationBuffer translations_;
 357   ZoneList<LDeferredCode*> deferred_;
 358   int osr_pc_offset_;
 359   bool frame_is_built_;
 360
 361   // Builder that keeps track of safepoints in the code. The table
 362   // itself is emitted at the end of the generated code.
 363   SafepointTableBuilder safepoints_;
 364
 365   // Compiler from a set of parallel moves to a sequential list of moves.
 366   LGapResolver resolver_;
 367
 368   Safepoint::Kind expected_safepoint_kind_;
 369
 370   class PushSafepointRegistersScope final BASE_EMBEDDED {
 371    public:
 372     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 373         : codegen_(codegen) {
 374       DCHECK(codegen_->info()->is_calling());
 375       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 376       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 377
 378       StoreRegistersStateStub stub(codegen_->isolate());
 379       codegen_->masm_->push(ra);
 380       codegen_->masm_->CallStub(&stub);
 381     }
 382
 383     ~PushSafepointRegistersScope() {
 384       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 385       RestoreRegistersStateStub stub(codegen_->isolate());
 386       codegen_->masm_->push(ra);
 387       codegen_->masm_->CallStub(&stub);
 388       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 389     }
 390
 391    private:
 392     LCodeGen* codegen_;
 393   };
 394
 395   friend class LDeferredCode;
 396   friend class LEnvironment;
 397   friend class SafepointGenerator;
 398   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 399 };
 400
 401
 402 class LDeferredCode : public ZoneObject {
 403  public:
 404   explicit LDeferredCode(LCodeGen* codegen)
 405       : codegen_(codegen),
 406         external_exit_(NULL),
 407         instruction_index_(codegen->current_instruction_) {
 408     codegen->AddDeferredCode(this);
 409   }
 410
 411   virtual ~LDeferredCode() {}
 412   virtual void Generate() = 0;
 413   virtual LInstruction* instr() = 0;
 414
 415   void SetExit(Label* exit) { external_exit_ = exit; }
 416   Label* entry() { return &entry_; }
 417   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 418   int instruction_index() const { return instruction_index_; }
 419
 420  protected:
 421   LCodeGen* codegen() const { return codegen_; }
 422   MacroAssembler* masm() const { return codegen_->masm(); }
 423
 424  private:
 425   LCodeGen* codegen_;
 426   Label entry_;
 427   Label exit_;
 428   Label* external_exit_;
 429   int instruction_index_;
 430 };
 431
 432 } }  // namespace v8::internal
 433
 434 #endif  // V8_MIPS_LITHIUM_CODEGEN_MIPS_H_