src/v8/src/x64/lithium-codegen-x64.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_X64_LITHIUM_CODEGEN_X64_H_
   6 #define V8_X64_LITHIUM_CODEGEN_X64_H_
   7
   8 #include "x64/lithium-x64.h"
   9
  10 #include "checks.h"
  11 #include "deoptimizer.h"
  12 #include "lithium-codegen.h"
  13 #include "safepoint-table.h"
  14 #include "scopes.h"
  15 #include "utils.h"
  16 #include "x64/lithium-gap-resolver-x64.h"
  17
  18 namespace v8 {
  19 namespace internal {
  20
  21 // Forward declarations.
  22 class LDeferredCode;
  23 class SafepointGenerator;
  24
  25 class LCodeGen: public LCodeGenBase {
  26  public:
  27   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
  28       : LCodeGenBase(chunk, assembler, info),
  29         deoptimizations_(4, info->zone()),
  30         jump_table_(4, info->zone()),
  31         deoptimization_literals_(8, info->zone()),
  32         inlined_function_count_(0),
  33         scope_(info->scope()),
  34         translations_(info->zone()),
  35         deferred_(8, info->zone()),
  36         osr_pc_offset_(-1),
  37         frame_is_built_(false),
  38         safepoints_(info->zone()),
  39         resolver_(this),
  40         expected_safepoint_kind_(Safepoint::kSimple) {
  41     PopulateDeoptimizationLiteralsWithInlinedFunctions();
  42   }
  43
  44   int LookupDestination(int block_id) const {
  45     return chunk()->LookupDestination(block_id);
  46   }
  47
  48   bool IsNextEmittedBlock(int block_id) const {
  49     return LookupDestination(block_id) == GetNextEmittedBlock();
  50   }
  51
  52   bool NeedsEagerFrame() const {
  53     return GetStackSlotCount() > 0 ||
  54         info()->is_non_deferred_calling() ||
  55         !info()->IsStub() ||
  56         info()->requires_frame();
  57   }
  58   bool NeedsDeferredFrame() const {
  59     return !NeedsEagerFrame() && info()->is_deferred_calling();
  60   }
  61
  62   // Support for converting LOperands to assembler types.
  63   Register ToRegister(LOperand* op) const;
  64   XMMRegister ToDoubleRegister(LOperand* op) const;
  65   XMMRegister ToFloat32x4Register(LOperand* op) const;
  66   XMMRegister ToFloat64x2Register(LOperand* op) const;
  67   XMMRegister ToInt32x4Register(LOperand* op) const;
  68   XMMRegister ToSIMD128Register(LOperand* op) const;
  69   bool IsInteger32Constant(LConstantOperand* op) const;
  70   bool IsDehoistedKeyConstant(LConstantOperand* op) const;
  71   bool IsSmiConstant(LConstantOperand* op) const;
  72   int32_t ToInteger32(LConstantOperand* op) const;
  73   Smi* ToSmi(LConstantOperand* op) const;
  74   double ToDouble(LConstantOperand* op) const;
  75   ExternalReference ToExternalReference(LConstantOperand* op) const;
  76   Handle<Object> ToHandle(LConstantOperand* op) const;
  77   Operand ToOperand(LOperand* op) const;
  78
  79   // Try to generate code for the entire chunk, but it may fail if the
  80   // chunk contains constructs we cannot handle. Returns true if the
  81   // code generation attempt succeeded.
  82   bool GenerateCode();
  83
  84   // Finish the code by setting stack height, safepoint, and bailout
  85   // information on it.
  86   void FinishCode(Handle<Code> code);
  87
  88   // Deferred code support.
  89   void DoDeferredNumberTagD(LNumberTagD* instr);
  90   void DoDeferredNumberTagU(LNumberTagU* instr);
  91   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
  92   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
  93   void DoDeferredStackCheck(LStackCheck* instr);
  94   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
  95   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
  96   void DoDeferredAllocate(LAllocate* instr);
  97   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
  98                                        Label* map_check);
  99   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 100   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 101                                    Register object,
 102                                    Register index);
 103   void DoDeferredSIMD128ToTagged(LSIMD128ToTagged* instr,
 104                                  Runtime::FunctionId id);
 105
 106   template<class T>
 107   void HandleTaggedToSIMD128(LTaggedToSIMD128* instr);
 108   template<class T>
 109   void HandleSIMD128ToTagged(LSIMD128ToTagged* instr);
 110
 111 // Parallel move support.
 112   void DoParallelMove(LParallelMove* move);
 113   void DoGap(LGap* instr);
 114
 115   // Emit frame translation commands for an environment.
 116   void WriteTranslation(LEnvironment* environment, Translation* translation);
 117
 118   // Declare methods that deal with the individual node types.
 119 #define DECLARE_DO(type) void Do##type(L##type* node);
 120   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 121 #undef DECLARE_DO
 122
 123  private:
 124   StrictMode strict_mode() const { return info()->strict_mode(); }
 125
 126   LPlatformChunk* chunk() const { return chunk_; }
 127   Scope* scope() const { return scope_; }
 128   HGraph* graph() const { return chunk()->graph(); }
 129
 130   XMMRegister double_scratch0() const { return xmm0; }
 131
 132   void EmitClassOfTest(Label* if_true,
 133                        Label* if_false,
 134                        Handle<String> class_name,
 135                        Register input,
 136                        Register temporary,
 137                        Register scratch);
 138
 139   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 140
 141   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 142
 143
 144   void SaveCallerDoubles();
 145   void RestoreCallerDoubles();
 146
 147   // Code generation passes.  Returns true if code generation should
 148   // continue.
 149   void GenerateBodyInstructionPre(LInstruction* instr) V8_OVERRIDE;
 150   void GenerateBodyInstructionPost(LInstruction* instr) V8_OVERRIDE;
 151   bool GeneratePrologue();
 152   bool GenerateDeferredCode();
 153   bool GenerateJumpTable();
 154   bool GenerateSafepointTable();
 155
 156   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 157   void GenerateOsrPrologue();
 158
 159   enum SafepointMode {
 160     RECORD_SIMPLE_SAFEPOINT,
 161     RECORD_SAFEPOINT_WITH_REGISTERS
 162   };
 163
 164   void CallCodeGeneric(Handle<Code> code,
 165                        RelocInfo::Mode mode,
 166                        LInstruction* instr,
 167                        SafepointMode safepoint_mode,
 168                        int argc);
 169
 170
 171   void CallCode(Handle<Code> code,
 172                 RelocInfo::Mode mode,
 173                 LInstruction* instr);
 174
 175   void CallRuntime(const Runtime::Function* function,
 176                    int num_arguments,
 177                    LInstruction* instr,
 178                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 179
 180   void CallRuntime(Runtime::FunctionId id,
 181                    int num_arguments,
 182                    LInstruction* instr) {
 183     const Runtime::Function* function = Runtime::FunctionForId(id);
 184     CallRuntime(function, num_arguments, instr);
 185   }
 186
 187   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 188                                int argc,
 189                                LInstruction* instr,
 190                                LOperand* context);
 191
 192   void LoadContextFromDeferred(LOperand* context);
 193
 194   enum RDIState {
 195     RDI_UNINITIALIZED,
 196     RDI_CONTAINS_TARGET
 197   };
 198
 199   // Generate a direct call to a known function.  Expects the function
 200   // to be in rdi.
 201   void CallKnownFunction(Handle<JSFunction> function,
 202                          int formal_parameter_count,
 203                          int arity,
 204                          LInstruction* instr,
 205                          RDIState rdi_state);
 206
 207   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 208                                     SafepointMode safepoint_mode,
 209                                     int argc);
 210   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 211                                             Safepoint::DeoptMode mode);
 212   void DeoptimizeIf(Condition cc,
 213                     LEnvironment* environment,
 214                     Deoptimizer::BailoutType bailout_type);
 215   void DeoptimizeIf(Condition cc, LEnvironment* environment);
 216
 217   bool DeoptEveryNTimes() {
 218     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
 219   }
 220
 221   void AddToTranslation(LEnvironment* environment,
 222                         Translation* translation,
 223                         LOperand* op,
 224                         bool is_tagged,
 225                         bool is_uint32,
 226                         int* object_index_pointer,
 227                         int* dematerialized_index_pointer);
 228   void PopulateDeoptimizationData(Handle<Code> code);
 229   int DefineDeoptimizationLiteral(Handle<Object> literal);
 230
 231   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 232
 233   Register ToRegister(int index) const;
 234   XMMRegister ToDoubleRegister(int index) const;
 235   XMMRegister ToSIMD128Register(int index) const;
 236   Operand BuildFastArrayOperand(
 237       LOperand* elements_pointer,
 238       LOperand* key,
 239       ElementsKind elements_kind,
 240       uint32_t offset,
 241       uint32_t additional_index = 0);
 242
 243   Operand BuildSeqStringOperand(Register string,
 244                                 LOperand* index,
 245                                 String::Encoding encoding);
 246
 247   void EmitIntegerMathAbs(LMathAbs* instr);
 248   void EmitSmiMathAbs(LMathAbs* instr);
 249
 250   // Support for recording safepoint and position information.
 251   void RecordSafepoint(LPointerMap* pointers,
 252                        Safepoint::Kind kind,
 253                        int arguments,
 254                        Safepoint::DeoptMode mode);
 255   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 256   void RecordSafepoint(Safepoint::DeoptMode mode);
 257   void RecordSafepointWithRegisters(LPointerMap* pointers,
 258                                     int arguments,
 259                                     Safepoint::DeoptMode mode);
 260   void RecordAndWritePosition(int position) V8_OVERRIDE;
 261
 262   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 263   void EmitGoto(int block);
 264
 265   // EmitBranch expects to be the last instruction of a block.
 266   template<class InstrType>
 267   void EmitBranch(InstrType instr, Condition cc);
 268   template<class InstrType>
 269   void EmitFalseBranch(InstrType instr, Condition cc);
 270   void EmitNumberUntagD(
 271       Register input,
 272       XMMRegister result,
 273       bool allow_undefined_as_nan,
 274       bool deoptimize_on_minus_zero,
 275       LEnvironment* env,
 276       NumberUntagDMode mode = NUMBER_CANDIDATE_IS_ANY_TAGGED);
 277
 278   // Emits optimized code for typeof x == "y".  Modifies input register.
 279   // Returns the condition on which a final split to
 280   // true and false label should be made, to optimize fallthrough.
 281   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
 282
 283   // Emits optimized code for %_IsObject(x).  Preserves input register.
 284   // Returns the condition on which a final split to
 285   // true and false label should be made, to optimize fallthrough.
 286   Condition EmitIsObject(Register input,
 287                          Label* is_not_object,
 288                          Label* is_object);
 289
 290   // Emits optimized code for %_IsString(x).  Preserves input register.
 291   // Returns the condition on which a final split to
 292   // true and false label should be made, to optimize fallthrough.
 293   Condition EmitIsString(Register input,
 294                          Register temp1,
 295                          Label* is_not_string,
 296                          SmiCheck check_needed);
 297
 298   // Emits optimized code for %_IsConstructCall().
 299   // Caller should branch on equal condition.
 300   void EmitIsConstructCall(Register temp);
 301
 302   // Emits code for pushing either a tagged constant, a (non-double)
 303   // register, or a stack slot operand.
 304   void EmitPushTaggedOperand(LOperand* operand);
 305
 306   // Emits optimized code to deep-copy the contents of statically known
 307   // object graphs (e.g. object literal boilerplate).
 308   void EmitDeepCopy(Handle<JSObject> object,
 309                     Register result,
 310                     Register source,
 311                     int* offset,
 312                     AllocationSiteMode mode);
 313
 314   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 315   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 316   void HandleExternalArrayOpRequiresPreScale(LOperand* key,
 317                                              ElementsKind elements_kind);
 318   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 319   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 320   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 321   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 322   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 323 #ifdef _MSC_VER
 324   // On windows, you may not access the stack more than one page below
 325   // the most recently mapped page. To make the allocated area randomly
 326   // accessible, we write an arbitrary value to each page in range
 327   // rsp + offset - page_size .. rsp in turn.
 328   void MakeSureStackPagesMapped(int offset);
 329 #endif
 330
 331   ZoneList<LEnvironment*> deoptimizations_;
 332   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 333   ZoneList<Handle<Object> > deoptimization_literals_;
 334   int inlined_function_count_;
 335   Scope* const scope_;
 336   TranslationBuffer translations_;
 337   ZoneList<LDeferredCode*> deferred_;
 338   int osr_pc_offset_;
 339   bool frame_is_built_;
 340
 341   // Builder that keeps track of safepoints in the code. The table
 342   // itself is emitted at the end of the generated code.
 343   SafepointTableBuilder safepoints_;
 344
 345   // Compiler from a set of parallel moves to a sequential list of moves.
 346   LGapResolver resolver_;
 347
 348   Safepoint::Kind expected_safepoint_kind_;
 349
 350   class PushSafepointRegistersScope V8_FINAL BASE_EMBEDDED {
 351    public:
 352     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 353         : codegen_(codegen) {
 354       ASSERT(codegen_->info()->is_calling());
 355       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 356       codegen_->masm_->PushSafepointRegisters();
 357       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 358     }
 359
 360     ~PushSafepointRegistersScope() {
 361       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 362       codegen_->masm_->PopSafepointRegisters();
 363       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 364     }
 365
 366    private:
 367     LCodeGen* codegen_;
 368   };
 369
 370   friend class LDeferredCode;
 371   friend class LEnvironment;
 372   friend class SafepointGenerator;
 373   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 374 };
 375
 376
 377 class LDeferredCode: public ZoneObject {
 378  public:
 379   explicit LDeferredCode(LCodeGen* codegen)
 380       : codegen_(codegen),
 381         external_exit_(NULL),
 382         instruction_index_(codegen->current_instruction_) {
 383     codegen->AddDeferredCode(this);
 384   }
 385
 386   virtual ~LDeferredCode() {}
 387   virtual void Generate() = 0;
 388   virtual LInstruction* instr() = 0;
 389
 390   void SetExit(Label* exit) { external_exit_ = exit; }
 391   Label* entry() { return &entry_; }
 392   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 393   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
 394   int instruction_index() const { return instruction_index_; }
 395
 396  protected:
 397   LCodeGen* codegen() const { return codegen_; }
 398   MacroAssembler* masm() const { return codegen_->masm(); }
 399
 400  private:
 401   LCodeGen* codegen_;
 402   Label entry_;
 403   Label exit_;
 404   Label done_;
 405   Label* external_exit_;
 406   int instruction_index_;
 407 };
 408
 409 } }  // namespace v8::internal
 410
 411 #endif  // V8_X64_LITHIUM_CODEGEN_X64_H_