src/v8/src/mips/lithium-codegen-mips.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 "deoptimizer.h"
   9 #include "mips/lithium-gap-resolver-mips.h"
  10 #include "mips/lithium-mips.h"
  11 #include "lithium-codegen.h"
  12 #include "safepoint-table.h"
  13 #include "scopes.h"
  14 #include "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         deopt_jump_table_(4, info->zone()),
  29         deoptimization_literals_(8, 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   RAStatus GetRAState() const {
  62     return frame_is_built_ ? kRAHasBeenSaved : kRAHasNotBeenSaved;
  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   DoubleRegister ToDoubleRegister(LOperand* op) const;
  74
  75   // LOperand is loaded into dbl_scratch, unless already a double register.
  76   DoubleRegister EmitLoadDoubleRegister(LOperand* op,
  77                                         FloatRegister flt_scratch,
  78                                         DoubleRegister 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   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 DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 114   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 115   void DoDeferredAllocate(LAllocate* instr);
 116   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 117                                        Label* map_check);
 118
 119   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 120   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 121                                    Register result,
 122                                    Register object,
 123                                    Register index);
 124
 125   // Parallel move support.
 126   void DoParallelMove(LParallelMove* move);
 127   void DoGap(LGap* instr);
 128
 129   MemOperand PrepareKeyedOperand(Register key,
 130                                  Register base,
 131                                  bool key_is_constant,
 132                                  int constant_key,
 133                                  int element_size,
 134                                  int shift_size,
 135                                  int additional_index,
 136                                  int additional_offset);
 137
 138   // Emit frame translation commands for an environment.
 139   void WriteTranslation(LEnvironment* environment, Translation* translation);
 140
 141   // Declare methods that deal with the individual node types.
 142 #define DECLARE_DO(type) void Do##type(L##type* node);
 143   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 144 #undef DECLARE_DO
 145
 146  private:
 147   StrictMode strict_mode() const { return info()->strict_mode(); }
 148
 149   Scope* scope() const { return scope_; }
 150
 151   Register scratch0() { return kLithiumScratchReg; }
 152   Register scratch1() { return kLithiumScratchReg2; }
 153   DoubleRegister double_scratch0() { return kLithiumScratchDouble; }
 154
 155   LInstruction* GetNextInstruction();
 156
 157   void EmitClassOfTest(Label* if_true,
 158                        Label* if_false,
 159                        Handle<String> class_name,
 160                        Register input,
 161                        Register temporary,
 162                        Register temporary2);
 163
 164   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 165
 166   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 167
 168   void SaveCallerDoubles();
 169   void RestoreCallerDoubles();
 170
 171   // Code generation passes.  Returns true if code generation should
 172   // continue.
 173   void GenerateBodyInstructionPre(LInstruction* instr) V8_OVERRIDE;
 174   bool GeneratePrologue();
 175   bool GenerateDeferredCode();
 176   bool GenerateDeoptJumpTable();
 177   bool GenerateSafepointTable();
 178
 179   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 180   void GenerateOsrPrologue();
 181
 182   enum SafepointMode {
 183     RECORD_SIMPLE_SAFEPOINT,
 184     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 185   };
 186
 187   void CallCode(Handle<Code> code,
 188                 RelocInfo::Mode mode,
 189                 LInstruction* instr);
 190
 191   void CallCodeGeneric(Handle<Code> code,
 192                        RelocInfo::Mode mode,
 193                        LInstruction* instr,
 194                        SafepointMode safepoint_mode);
 195
 196   void CallRuntime(const Runtime::Function* function,
 197                    int num_arguments,
 198                    LInstruction* instr,
 199                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 200
 201   void CallRuntime(Runtime::FunctionId id,
 202                    int num_arguments,
 203                    LInstruction* instr) {
 204     const Runtime::Function* function = Runtime::FunctionForId(id);
 205     CallRuntime(function, num_arguments, instr);
 206   }
 207
 208   void LoadContextFromDeferred(LOperand* context);
 209   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 210                                int argc,
 211                                LInstruction* instr,
 212                                LOperand* context);
 213
 214   enum A1State {
 215     A1_UNINITIALIZED,
 216     A1_CONTAINS_TARGET
 217   };
 218
 219   // Generate a direct call to a known function.  Expects the function
 220   // to be in a1.
 221   void CallKnownFunction(Handle<JSFunction> function,
 222                          int formal_parameter_count,
 223                          int arity,
 224                          LInstruction* instr,
 225                          A1State a1_state);
 226
 227   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 228                                     SafepointMode safepoint_mode);
 229
 230   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 231                                             Safepoint::DeoptMode mode);
 232   void DeoptimizeIf(Condition condition,
 233                     LEnvironment* environment,
 234                     Deoptimizer::BailoutType bailout_type,
 235                     Register src1 = zero_reg,
 236                     const Operand& src2 = Operand(zero_reg));
 237   void DeoptimizeIf(Condition condition,
 238                     LEnvironment* environment,
 239                     Register src1 = zero_reg,
 240                     const Operand& src2 = Operand(zero_reg));
 241
 242   void AddToTranslation(LEnvironment* environment,
 243                         Translation* translation,
 244                         LOperand* op,
 245                         bool is_tagged,
 246                         bool is_uint32,
 247                         int* object_index_pointer,
 248                         int* dematerialized_index_pointer);
 249   void PopulateDeoptimizationData(Handle<Code> code);
 250   int DefineDeoptimizationLiteral(Handle<Object> literal);
 251
 252   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 253
 254   Register ToRegister(int index) const;
 255   DoubleRegister ToDoubleRegister(int index) const;
 256
 257   MemOperand BuildSeqStringOperand(Register string,
 258                                    LOperand* index,
 259                                    String::Encoding encoding);
 260
 261   void EmitIntegerMathAbs(LMathAbs* instr);
 262
 263   // Support for recording safepoint and position information.
 264   void RecordSafepoint(LPointerMap* pointers,
 265                        Safepoint::Kind kind,
 266                        int arguments,
 267                        Safepoint::DeoptMode mode);
 268   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 269   void RecordSafepoint(Safepoint::DeoptMode mode);
 270   void RecordSafepointWithRegisters(LPointerMap* pointers,
 271                                     int arguments,
 272                                     Safepoint::DeoptMode mode);
 273   void RecordSafepointWithRegistersAndDoubles(LPointerMap* pointers,
 274                                               int arguments,
 275                                               Safepoint::DeoptMode mode);
 276
 277   void RecordAndWritePosition(int position) V8_OVERRIDE;
 278
 279   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 280   void EmitGoto(int block);
 281
 282   // EmitBranch expects to be the last instruction of a block.
 283   template<class InstrType>
 284   void EmitBranch(InstrType instr,
 285                   Condition condition,
 286                   Register src1,
 287                   const Operand& src2);
 288   template<class InstrType>
 289   void EmitBranchF(InstrType instr,
 290                    Condition condition,
 291                    FPURegister src1,
 292                    FPURegister src2);
 293   template<class InstrType>
 294   void EmitFalseBranch(InstrType instr,
 295                        Condition condition,
 296                        Register src1,
 297                        const Operand& src2);
 298   template<class InstrType>
 299   void EmitFalseBranchF(InstrType instr,
 300                         Condition condition,
 301                         FPURegister src1,
 302                         FPURegister src2);
 303   void EmitCmpI(LOperand* left, LOperand* right);
 304   void EmitNumberUntagD(Register input,
 305                         DoubleRegister result,
 306                         bool allow_undefined_as_nan,
 307                         bool deoptimize_on_minus_zero,
 308                         LEnvironment* env,
 309                         NumberUntagDMode mode);
 310
 311   // Emits optimized code for typeof x == "y".  Modifies input register.
 312   // Returns the condition on which a final split to
 313   // true and false label should be made, to optimize fallthrough.
 314   // Returns two registers in cmp1 and cmp2 that can be used in the
 315   // Branch instruction after EmitTypeofIs.
 316   Condition EmitTypeofIs(Label* true_label,
 317                          Label* false_label,
 318                          Register input,
 319                          Handle<String> type_name,
 320                          Register& cmp1,
 321                          Operand& cmp2);
 322
 323   // Emits optimized code for %_IsObject(x).  Preserves input register.
 324   // Returns the condition on which a final split to
 325   // true and false label should be made, to optimize fallthrough.
 326   Condition EmitIsObject(Register input,
 327                          Register temp1,
 328                          Register temp2,
 329                          Label* is_not_object,
 330                          Label* is_object);
 331
 332   // Emits optimized code for %_IsString(x).  Preserves input register.
 333   // Returns the condition on which a final split to
 334   // true and false label should be made, to optimize fallthrough.
 335   Condition EmitIsString(Register input,
 336                          Register temp1,
 337                          Label* is_not_string,
 338                          SmiCheck check_needed);
 339
 340   // Emits optimized code for %_IsConstructCall().
 341   // Caller should branch on equal condition.
 342   void EmitIsConstructCall(Register temp1, Register temp2);
 343
 344   // Emits optimized code to deep-copy the contents of statically known
 345   // object graphs (e.g. object literal boilerplate).
 346   void EmitDeepCopy(Handle<JSObject> object,
 347                     Register result,
 348                     Register source,
 349                     int* offset,
 350                     AllocationSiteMode mode);
 351   // Emit optimized code for integer division.
 352   // Inputs are signed.
 353   // All registers are clobbered.
 354   // If 'remainder' is no_reg, it is not computed.
 355   void EmitSignedIntegerDivisionByConstant(Register result,
 356                                            Register dividend,
 357                                            int32_t divisor,
 358                                            Register remainder,
 359                                            Register scratch,
 360                                            LEnvironment* environment);
 361
 362
 363   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 364   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 365   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 366   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 367   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 368   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 369   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 370
 371   ZoneList<LEnvironment*> deoptimizations_;
 372   ZoneList<Deoptimizer::JumpTableEntry> deopt_jump_table_;
 373   ZoneList<Handle<Object> > deoptimization_literals_;
 374   int inlined_function_count_;
 375   Scope* const scope_;
 376   TranslationBuffer translations_;
 377   ZoneList<LDeferredCode*> deferred_;
 378   int osr_pc_offset_;
 379   bool frame_is_built_;
 380
 381   // Builder that keeps track of safepoints in the code. The table
 382   // itself is emitted at the end of the generated code.
 383   SafepointTableBuilder safepoints_;
 384
 385   // Compiler from a set of parallel moves to a sequential list of moves.
 386   LGapResolver resolver_;
 387
 388   Safepoint::Kind expected_safepoint_kind_;
 389
 390   class PushSafepointRegistersScope V8_FINAL  BASE_EMBEDDED {
 391    public:
 392     PushSafepointRegistersScope(LCodeGen* codegen,
 393                                 Safepoint::Kind kind)
 394         : codegen_(codegen) {
 395       ASSERT(codegen_->info()->is_calling());
 396       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 397       codegen_->expected_safepoint_kind_ = kind;
 398
 399       switch (codegen_->expected_safepoint_kind_) {
 400         case Safepoint::kWithRegisters: {
 401           StoreRegistersStateStub stub1(codegen_->masm_->isolate(),
 402                                         kDontSaveFPRegs);
 403           codegen_->masm_->push(ra);
 404           codegen_->masm_->CallStub(&stub1);
 405           break;
 406         }
 407         case Safepoint::kWithRegistersAndDoubles: {
 408           StoreRegistersStateStub stub2(codegen_->masm_->isolate(),
 409                                         kSaveFPRegs);
 410           codegen_->masm_->push(ra);
 411           codegen_->masm_->CallStub(&stub2);
 412           break;
 413         }
 414         default:
 415           UNREACHABLE();
 416       }
 417     }
 418
 419     ~PushSafepointRegistersScope() {
 420       Safepoint::Kind kind = codegen_->expected_safepoint_kind_;
 421       ASSERT((kind & Safepoint::kWithRegisters) != 0);
 422       switch (kind) {
 423         case Safepoint::kWithRegisters: {
 424           RestoreRegistersStateStub stub1(codegen_->masm_->isolate(),
 425                                           kDontSaveFPRegs);
 426           codegen_->masm_->push(ra);
 427           codegen_->masm_->CallStub(&stub1);
 428           break;
 429         }
 430         case Safepoint::kWithRegistersAndDoubles: {
 431           RestoreRegistersStateStub stub2(codegen_->masm_->isolate(),
 432                                           kSaveFPRegs);
 433           codegen_->masm_->push(ra);
 434           codegen_->masm_->CallStub(&stub2);
 435           break;
 436         }
 437         default:
 438           UNREACHABLE();
 439       }
 440       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 441     }
 442
 443    private:
 444     LCodeGen* codegen_;
 445   };
 446
 447   friend class LDeferredCode;
 448   friend class LEnvironment;
 449   friend class SafepointGenerator;
 450   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 451 };
 452
 453
 454 class LDeferredCode : public ZoneObject {
 455  public:
 456   explicit LDeferredCode(LCodeGen* codegen)
 457       : codegen_(codegen),
 458         external_exit_(NULL),
 459         instruction_index_(codegen->current_instruction_) {
 460     codegen->AddDeferredCode(this);
 461   }
 462
 463   virtual ~LDeferredCode() {}
 464   virtual void Generate() = 0;
 465   virtual LInstruction* instr() = 0;
 466
 467   void SetExit(Label* exit) { external_exit_ = exit; }
 468   Label* entry() { return &entry_; }
 469   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 470   int instruction_index() const { return instruction_index_; }
 471
 472  protected:
 473   LCodeGen* codegen() const { return codegen_; }
 474   MacroAssembler* masm() const { return codegen_->masm(); }
 475
 476  private:
 477   LCodeGen* codegen_;
 478   Label entry_;
 479   Label exit_;
 480   Label* external_exit_;
 481   int instruction_index_;
 482 };
 483
 484 } }  // namespace v8::internal
 485
 486 #endif  // V8_MIPS_LITHIUM_CODEGEN_MIPS_H_