src/v8/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         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_donotuse(LConstantOperand* op,
  80                                     const Representation& r) const;
  81   int32_t ToInteger32(LConstantOperand* op) const;
  82   Smi* ToSmi(LConstantOperand* op) const;
  83   double ToDouble(LConstantOperand* op) const;
  84   Operand ToOperand(LOperand* op);
  85   MemOperand ToMemOperand(LOperand* op) const;
  86   // Returns a MemOperand pointing to the high word of a DoubleStackSlot.
  87   MemOperand ToHighMemOperand(LOperand* op) const;
  88
  89   bool IsInteger32(LConstantOperand* op) const;
  90   bool IsSmi(LConstantOperand* op) const;
  91   Handle<Object> ToHandle(LConstantOperand* op) const;
  92
  93   // Try to generate code for the entire chunk, but it may fail if the
  94   // chunk contains constructs we cannot handle. Returns true if the
  95   // code generation attempt succeeded.
  96   bool GenerateCode();
  97
  98   // Finish the code by setting stack height, safepoint, and bailout
  99   // information on it.
 100   void FinishCode(Handle<Code> code);
 101
 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 DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 115   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 116   void DoDeferredAllocate(LAllocate* instr);
 117   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 118                                        Label* map_check);
 119
 120   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 121   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 122                                    Register result,
 123                                    Register object,
 124                                    Register index);
 125
 126   // Parallel move support.
 127   void DoParallelMove(LParallelMove* move);
 128   void DoGap(LGap* instr);
 129
 130   MemOperand PrepareKeyedOperand(Register key,
 131                                  Register base,
 132                                  bool key_is_constant,
 133                                  int constant_key,
 134                                  int element_size,
 135                                  int shift_size,
 136                                  int base_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
 274   void RecordAndWritePosition(int position) V8_OVERRIDE;
 275
 276   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 277   void EmitGoto(int block);
 278
 279   // EmitBranch expects to be the last instruction of a block.
 280   template<class InstrType>
 281   void EmitBranch(InstrType instr,
 282                   Condition condition,
 283                   Register src1,
 284                   const Operand& src2);
 285   template<class InstrType>
 286   void EmitBranchF(InstrType instr,
 287                    Condition condition,
 288                    FPURegister src1,
 289                    FPURegister src2);
 290   template<class InstrType>
 291   void EmitFalseBranch(InstrType instr,
 292                        Condition condition,
 293                        Register src1,
 294                        const Operand& src2);
 295   template<class InstrType>
 296   void EmitFalseBranchF(InstrType instr,
 297                         Condition condition,
 298                         FPURegister src1,
 299                         FPURegister src2);
 300   void EmitCmpI(LOperand* left, LOperand* right);
 301   void EmitNumberUntagD(Register input,
 302                         DoubleRegister result,
 303                         bool allow_undefined_as_nan,
 304                         bool deoptimize_on_minus_zero,
 305                         LEnvironment* env,
 306                         NumberUntagDMode mode);
 307
 308   // Emits optimized code for typeof x == "y".  Modifies input register.
 309   // Returns the condition on which a final split to
 310   // true and false label should be made, to optimize fallthrough.
 311   // Returns two registers in cmp1 and cmp2 that can be used in the
 312   // Branch instruction after EmitTypeofIs.
 313   Condition EmitTypeofIs(Label* true_label,
 314                          Label* false_label,
 315                          Register input,
 316                          Handle<String> type_name,
 317                          Register* cmp1,
 318                          Operand* cmp2);
 319
 320   // Emits optimized code for %_IsObject(x).  Preserves input register.
 321   // Returns the condition on which a final split to
 322   // true and false label should be made, to optimize fallthrough.
 323   Condition EmitIsObject(Register input,
 324                          Register temp1,
 325                          Register temp2,
 326                          Label* is_not_object,
 327                          Label* is_object);
 328
 329   // Emits optimized code for %_IsString(x).  Preserves input register.
 330   // Returns the condition on which a final split to
 331   // true and false label should be made, to optimize fallthrough.
 332   Condition EmitIsString(Register input,
 333                          Register temp1,
 334                          Label* is_not_string,
 335                          SmiCheck check_needed);
 336
 337   // Emits optimized code for %_IsConstructCall().
 338   // Caller should branch on equal condition.
 339   void EmitIsConstructCall(Register temp1, Register temp2);
 340
 341   // Emits optimized code to deep-copy the contents of statically known
 342   // object graphs (e.g. object literal boilerplate).
 343   void EmitDeepCopy(Handle<JSObject> object,
 344                     Register result,
 345                     Register source,
 346                     int* offset,
 347                     AllocationSiteMode mode);
 348   // Emit optimized code for integer division.
 349   // Inputs are signed.
 350   // All registers are clobbered.
 351   // If 'remainder' is no_reg, it is not computed.
 352   void EmitSignedIntegerDivisionByConstant(Register result,
 353                                            Register dividend,
 354                                            int32_t divisor,
 355                                            Register remainder,
 356                                            Register scratch,
 357                                            LEnvironment* environment);
 358
 359
 360   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 361   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 362   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 363   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 364   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 365   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 366   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 367
 368   ZoneList<LEnvironment*> deoptimizations_;
 369   ZoneList<Deoptimizer::JumpTableEntry> deopt_jump_table_;
 370   ZoneList<Handle<Object> > deoptimization_literals_;
 371   int inlined_function_count_;
 372   Scope* const scope_;
 373   TranslationBuffer translations_;
 374   ZoneList<LDeferredCode*> deferred_;
 375   int osr_pc_offset_;
 376   bool frame_is_built_;
 377
 378   // Builder that keeps track of safepoints in the code. The table
 379   // itself is emitted at the end of the generated code.
 380   SafepointTableBuilder safepoints_;
 381
 382   // Compiler from a set of parallel moves to a sequential list of moves.
 383   LGapResolver resolver_;
 384
 385   Safepoint::Kind expected_safepoint_kind_;
 386
 387   class PushSafepointRegistersScope V8_FINAL BASE_EMBEDDED {
 388    public:
 389     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 390         : codegen_(codegen) {
 391       DCHECK(codegen_->info()->is_calling());
 392       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 393       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 394
 395       StoreRegistersStateStub stub(codegen_->isolate());
 396       codegen_->masm_->push(ra);
 397       codegen_->masm_->CallStub(&stub);
 398     }
 399
 400     ~PushSafepointRegistersScope() {
 401       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 402       RestoreRegistersStateStub stub(codegen_->isolate());
 403       codegen_->masm_->push(ra);
 404       codegen_->masm_->CallStub(&stub);
 405       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 406     }
 407
 408    private:
 409     LCodeGen* codegen_;
 410   };
 411
 412   friend class LDeferredCode;
 413   friend class LEnvironment;
 414   friend class SafepointGenerator;
 415   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 416 };
 417
 418
 419 class LDeferredCode : public ZoneObject {
 420  public:
 421   explicit LDeferredCode(LCodeGen* codegen)
 422       : codegen_(codegen),
 423         external_exit_(NULL),
 424         instruction_index_(codegen->current_instruction_) {
 425     codegen->AddDeferredCode(this);
 426   }
 427
 428   virtual ~LDeferredCode() {}
 429   virtual void Generate() = 0;
 430   virtual LInstruction* instr() = 0;
 431
 432   void SetExit(Label* exit) { external_exit_ = exit; }
 433   Label* entry() { return &entry_; }
 434   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 435   int instruction_index() const { return instruction_index_; }
 436
 437  protected:
 438   LCodeGen* codegen() const { return codegen_; }
 439   MacroAssembler* masm() const { return codegen_->masm(); }
 440
 441  private:
 442   LCodeGen* codegen_;
 443   Label entry_;
 444   Label exit_;
 445   Label* external_exit_;
 446   int instruction_index_;
 447 };
 448
 449 } }  // namespace v8::internal
 450
 451 #endif  // V8_MIPS_LITHIUM_CODEGEN_MIPS_H_