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 "src/x64/lithium-x64.h"
   9
  10 #include "src/base/logging.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 #include "src/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 ToRepresentation(LConstantOperand* op, const Representation& r) const;
  73   int32_t ToInteger32(LConstantOperand* op) const;
  74   Smi* ToSmi(LConstantOperand* op) const;
  75   double ToDouble(LConstantOperand* op) const;
  76   ExternalReference ToExternalReference(LConstantOperand* op) const;
  77   Handle<Object> ToHandle(LConstantOperand* op) const;
  78   Operand ToOperand(LOperand* op) const;
  79
  80   // Try to generate code for the entire chunk, but it may fail if the
  81   // chunk contains constructs we cannot handle. Returns true if the
  82   // code generation attempt succeeded.
  83   bool GenerateCode();
  84
  85   // Finish the code by setting stack height, safepoint, and bailout
  86   // information on it.
  87   void FinishCode(Handle<Code> code);
  88
  89   // Deferred code support.
  90   void DoDeferredNumberTagD(LNumberTagD* instr);
  91
  92   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
  93   void DoDeferredNumberTagIU(LInstruction* instr,
  94                              LOperand* value,
  95                              LOperand* temp1,
  96                              LOperand* temp2,
  97                              IntegerSignedness signedness);
  98
  99   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
 100   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
 101   void DoDeferredStackCheck(LStackCheck* instr);
 102   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 103   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 104   void DoDeferredAllocate(LAllocate* instr);
 105   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 106                                        Label* map_check);
 107   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 108   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 109                                    Register object,
 110                                    Register index);
 111   void DoDeferredSIMD128ToTagged(LSIMD128ToTagged* instr,
 112                                  Runtime::FunctionId id);
 113
 114   template<class T>
 115   void HandleTaggedToSIMD128(LTaggedToSIMD128* instr);
 116   template<class T>
 117   void HandleSIMD128ToTagged(LSIMD128ToTagged* instr);
 118
 119 // Parallel move support.
 120   void DoParallelMove(LParallelMove* move);
 121   void DoGap(LGap* instr);
 122
 123   // Emit frame translation commands for an environment.
 124   void WriteTranslation(LEnvironment* environment, Translation* translation);
 125
 126   // Declare methods that deal with the individual node types.
 127 #define DECLARE_DO(type) void Do##type(L##type* node);
 128   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 129 #undef DECLARE_DO
 130
 131  private:
 132   StrictMode strict_mode() const { return info()->strict_mode(); }
 133
 134   LPlatformChunk* chunk() const { return chunk_; }
 135   Scope* scope() const { return scope_; }
 136   HGraph* graph() const { return chunk()->graph(); }
 137
 138   XMMRegister double_scratch0() const { return xmm0; }
 139
 140   void EmitClassOfTest(Label* if_true,
 141                        Label* if_false,
 142                        Handle<String> class_name,
 143                        Register input,
 144                        Register temporary,
 145                        Register scratch);
 146
 147   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 148
 149   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 150
 151
 152   void SaveCallerDoubles();
 153   void RestoreCallerDoubles();
 154
 155   // Code generation passes.  Returns true if code generation should
 156   // continue.
 157   void GenerateBodyInstructionPre(LInstruction* instr) OVERRIDE;
 158   void GenerateBodyInstructionPost(LInstruction* instr) OVERRIDE;
 159   bool GeneratePrologue();
 160   bool GenerateDeferredCode();
 161   bool GenerateJumpTable();
 162   bool GenerateSafepointTable();
 163
 164   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 165   void GenerateOsrPrologue();
 166
 167   enum SafepointMode {
 168     RECORD_SIMPLE_SAFEPOINT,
 169     RECORD_SAFEPOINT_WITH_REGISTERS
 170   };
 171
 172   void CallCodeGeneric(Handle<Code> code,
 173                        RelocInfo::Mode mode,
 174                        LInstruction* instr,
 175                        SafepointMode safepoint_mode,
 176                        int argc);
 177
 178
 179   void CallCode(Handle<Code> code,
 180                 RelocInfo::Mode mode,
 181                 LInstruction* instr);
 182
 183   void CallRuntime(const Runtime::Function* function,
 184                    int num_arguments,
 185                    LInstruction* instr,
 186                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 187
 188   void CallRuntime(Runtime::FunctionId id,
 189                    int num_arguments,
 190                    LInstruction* instr) {
 191     const Runtime::Function* function = Runtime::FunctionForId(id);
 192     CallRuntime(function, num_arguments, instr);
 193   }
 194
 195   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 196                                int argc,
 197                                LInstruction* instr,
 198                                LOperand* context);
 199
 200   void LoadContextFromDeferred(LOperand* context);
 201
 202   enum RDIState {
 203     RDI_UNINITIALIZED,
 204     RDI_CONTAINS_TARGET
 205   };
 206
 207   // Generate a direct call to a known function.  Expects the function
 208   // to be in rdi.
 209   void CallKnownFunction(Handle<JSFunction> function,
 210                          int formal_parameter_count,
 211                          int arity,
 212                          LInstruction* instr,
 213                          RDIState rdi_state);
 214
 215   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 216                                     SafepointMode safepoint_mode,
 217                                     int argc);
 218   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 219                                             Safepoint::DeoptMode mode);
 220   void DeoptimizeIf(Condition cc, LInstruction* instr, const char* detail,
 221                     Deoptimizer::BailoutType bailout_type);
 222   void DeoptimizeIf(Condition cc, LInstruction* instr, const char* detail);
 223
 224   bool DeoptEveryNTimes() {
 225     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
 226   }
 227
 228   void AddToTranslation(LEnvironment* environment,
 229                         Translation* translation,
 230                         LOperand* op,
 231                         bool is_tagged,
 232                         bool is_uint32,
 233                         int* object_index_pointer,
 234                         int* dematerialized_index_pointer);
 235   void PopulateDeoptimizationData(Handle<Code> code);
 236   int DefineDeoptimizationLiteral(Handle<Object> literal);
 237
 238   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 239
 240   Register ToRegister(int index) const;
 241   XMMRegister ToDoubleRegister(int index) const;
 242   XMMRegister ToSIMD128Register(int index) const;
 243   Operand BuildFastArrayOperand(
 244       LOperand* elements_pointer,
 245       LOperand* key,
 246       Representation key_representation,
 247       ElementsKind elements_kind,
 248       uint32_t base_offset);
 249
 250   Operand BuildSeqStringOperand(Register string,
 251                                 LOperand* index,
 252                                 String::Encoding encoding);
 253
 254   void EmitIntegerMathAbs(LMathAbs* instr);
 255   void EmitSmiMathAbs(LMathAbs* instr);
 256
 257   // Support for recording safepoint and position information.
 258   void RecordSafepoint(LPointerMap* pointers,
 259                        Safepoint::Kind kind,
 260                        int arguments,
 261                        Safepoint::DeoptMode mode);
 262   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 263   void RecordSafepoint(Safepoint::DeoptMode mode);
 264   void RecordSafepointWithRegisters(LPointerMap* pointers,
 265                                     int arguments,
 266                                     Safepoint::DeoptMode mode);
 267   void RecordAndWritePosition(int position) OVERRIDE;
 268
 269   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 270   void EmitGoto(int block);
 271
 272   // EmitBranch expects to be the last instruction of a block.
 273   template<class InstrType>
 274   void EmitBranch(InstrType instr, Condition cc);
 275   template<class InstrType>
 276   void EmitFalseBranch(InstrType instr, Condition cc);
 277   void EmitNumberUntagD(LNumberUntagD* instr, Register input,
 278                         XMMRegister 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(LTypeofIsAndBranch* instr, Register input);
 284
 285   // Emits optimized code for %_IsObject(x).  Preserves input register.
 286   // Returns the condition on which a final split to
 287   // true and false label should be made, to optimize fallthrough.
 288   Condition EmitIsObject(Register input,
 289                          Label* is_not_object,
 290                          Label* is_object);
 291
 292   // Emits optimized code for %_IsString(x).  Preserves input register.
 293   // Returns the condition on which a final split to
 294   // true and false label should be made, to optimize fallthrough.
 295   Condition EmitIsString(Register input,
 296                          Register temp1,
 297                          Label* is_not_string,
 298                          SmiCheck check_needed);
 299
 300   // Emits optimized code for %_IsConstructCall().
 301   // Caller should branch on equal condition.
 302   void EmitIsConstructCall(Register temp);
 303
 304   // Emits code for pushing either a tagged constant, a (non-double)
 305   // register, or a stack slot operand.
 306   void EmitPushTaggedOperand(LOperand* operand);
 307
 308   // Emits optimized code to deep-copy the contents of statically known
 309   // object graphs (e.g. object literal boilerplate).
 310   void EmitDeepCopy(Handle<JSObject> object,
 311                     Register result,
 312                     Register source,
 313                     int* offset,
 314                     AllocationSiteMode mode);
 315
 316   void EnsureSpaceForLazyDeopt(int space_needed) OVERRIDE;
 317   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 318   bool HandleExternalArrayOpRequiresPreScale(LOperand* key,
 319                                              Representation key_representation,
 320                                              ElementsKind elements_kind);
 321   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 322   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 323   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 324   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 325   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 326
 327   template <class T>
 328   void EmitVectorLoadICRegisters(T* instr);
 329
 330 #ifdef _MSC_VER
 331   // On windows, you may not access the stack more than one page below
 332   // the most recently mapped page. To make the allocated area randomly
 333   // accessible, we write an arbitrary value to each page in range
 334   // rsp + offset - page_size .. rsp in turn.
 335   void MakeSureStackPagesMapped(int offset);
 336 #endif
 337
 338   ZoneList<LEnvironment*> deoptimizations_;
 339   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 340   ZoneList<Handle<Object> > deoptimization_literals_;
 341   int inlined_function_count_;
 342   Scope* const scope_;
 343   TranslationBuffer translations_;
 344   ZoneList<LDeferredCode*> deferred_;
 345   int osr_pc_offset_;
 346   bool frame_is_built_;
 347
 348   // Builder that keeps track of safepoints in the code. The table
 349   // itself is emitted at the end of the generated code.
 350   SafepointTableBuilder safepoints_;
 351
 352   // Compiler from a set of parallel moves to a sequential list of moves.
 353   LGapResolver resolver_;
 354
 355   Safepoint::Kind expected_safepoint_kind_;
 356
 357   class PushSafepointRegistersScope FINAL BASE_EMBEDDED {
 358    public:
 359     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 360         : codegen_(codegen) {
 361       DCHECK(codegen_->info()->is_calling());
 362       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 363       codegen_->masm_->PushSafepointRegisters();
 364       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 365     }
 366
 367     ~PushSafepointRegistersScope() {
 368       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 369       codegen_->masm_->PopSafepointRegisters();
 370       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 371     }
 372
 373    private:
 374     LCodeGen* codegen_;
 375   };
 376
 377   friend class LDeferredCode;
 378   friend class LEnvironment;
 379   friend class SafepointGenerator;
 380   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 381 };
 382
 383
 384 class LDeferredCode: public ZoneObject {
 385  public:
 386   explicit LDeferredCode(LCodeGen* codegen)
 387       : codegen_(codegen),
 388         external_exit_(NULL),
 389         instruction_index_(codegen->current_instruction_) {
 390     codegen->AddDeferredCode(this);
 391   }
 392
 393   virtual ~LDeferredCode() {}
 394   virtual void Generate() = 0;
 395   virtual LInstruction* instr() = 0;
 396
 397   void SetExit(Label* exit) { external_exit_ = exit; }
 398   Label* entry() { return &entry_; }
 399   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 400   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
 401   int instruction_index() const { return instruction_index_; }
 402
 403  protected:
 404   LCodeGen* codegen() const { return codegen_; }
 405   MacroAssembler* masm() const { return codegen_->masm(); }
 406
 407  private:
 408   LCodeGen* codegen_;
 409   Label entry_;
 410   Label exit_;
 411   Label done_;
 412   Label* external_exit_;
 413   int instruction_index_;
 414 };
 415
 416 } }  // namespace v8::internal
 417
 418 #endif  // V8_X64_LITHIUM_CODEGEN_X64_H_