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/checks.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) V8_OVERRIDE;
 158   void GenerateBodyInstructionPost(LInstruction* instr) V8_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,
 221                     LEnvironment* environment,
 222                     Deoptimizer::BailoutType bailout_type);
 223   void DeoptimizeIf(Condition cc, LEnvironment* environment);
 224
 225   bool DeoptEveryNTimes() {
 226     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
 227   }
 228
 229   void AddToTranslation(LEnvironment* environment,
 230                         Translation* translation,
 231                         LOperand* op,
 232                         bool is_tagged,
 233                         bool is_uint32,
 234                         int* object_index_pointer,
 235                         int* dematerialized_index_pointer);
 236   void PopulateDeoptimizationData(Handle<Code> code);
 237   int DefineDeoptimizationLiteral(Handle<Object> literal);
 238
 239   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 240
 241   Register ToRegister(int index) const;
 242   XMMRegister ToDoubleRegister(int index) const;
 243   XMMRegister ToSIMD128Register(int index) const;
 244   Operand BuildFastArrayOperand(
 245       LOperand* elements_pointer,
 246       LOperand* key,
 247       Representation key_representation,
 248       ElementsKind elements_kind,
 249       uint32_t base_offset);
 250
 251   Operand BuildSeqStringOperand(Register string,
 252                                 LOperand* index,
 253                                 String::Encoding encoding);
 254
 255   void EmitIntegerMathAbs(LMathAbs* instr);
 256   void EmitSmiMathAbs(LMathAbs* instr);
 257
 258   // Support for recording safepoint and position information.
 259   void RecordSafepoint(LPointerMap* pointers,
 260                        Safepoint::Kind kind,
 261                        int arguments,
 262                        Safepoint::DeoptMode mode);
 263   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 264   void RecordSafepoint(Safepoint::DeoptMode mode);
 265   void RecordSafepointWithRegisters(LPointerMap* pointers,
 266                                     int arguments,
 267                                     Safepoint::DeoptMode mode);
 268   void RecordAndWritePosition(int position) V8_OVERRIDE;
 269
 270   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 271   void EmitGoto(int block);
 272
 273   // EmitBranch expects to be the last instruction of a block.
 274   template<class InstrType>
 275   void EmitBranch(InstrType instr, Condition cc);
 276   template<class InstrType>
 277   void EmitFalseBranch(InstrType instr, Condition cc);
 278   void EmitNumberUntagD(
 279       Register input,
 280       XMMRegister result,
 281       bool allow_undefined_as_nan,
 282       bool deoptimize_on_minus_zero,
 283       LEnvironment* env,
 284       NumberUntagDMode mode = NUMBER_CANDIDATE_IS_ANY_TAGGED);
 285
 286   // Emits optimized code for typeof x == "y".  Modifies input register.
 287   // Returns the condition on which a final split to
 288   // true and false label should be made, to optimize fallthrough.
 289   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
 290
 291   // Emits optimized code for %_IsObject(x).  Preserves input register.
 292   // Returns the condition on which a final split to
 293   // true and false label should be made, to optimize fallthrough.
 294   Condition EmitIsObject(Register input,
 295                          Label* is_not_object,
 296                          Label* is_object);
 297
 298   // Emits optimized code for %_IsString(x).  Preserves input register.
 299   // Returns the condition on which a final split to
 300   // true and false label should be made, to optimize fallthrough.
 301   Condition EmitIsString(Register input,
 302                          Register temp1,
 303                          Label* is_not_string,
 304                          SmiCheck check_needed);
 305
 306   // Emits optimized code for %_IsConstructCall().
 307   // Caller should branch on equal condition.
 308   void EmitIsConstructCall(Register temp);
 309
 310   // Emits code for pushing either a tagged constant, a (non-double)
 311   // register, or a stack slot operand.
 312   void EmitPushTaggedOperand(LOperand* operand);
 313
 314   // Emits optimized code to deep-copy the contents of statically known
 315   // object graphs (e.g. object literal boilerplate).
 316   void EmitDeepCopy(Handle<JSObject> object,
 317                     Register result,
 318                     Register source,
 319                     int* offset,
 320                     AllocationSiteMode mode);
 321
 322   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 323   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 324   bool HandleExternalArrayOpRequiresPreScale(LOperand* key,
 325                                              Representation key_representation,
 326                                              ElementsKind elements_kind);
 327   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 328   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 329   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 330   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 331   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 332 #ifdef _MSC_VER
 333   // On windows, you may not access the stack more than one page below
 334   // the most recently mapped page. To make the allocated area randomly
 335   // accessible, we write an arbitrary value to each page in range
 336   // rsp + offset - page_size .. rsp in turn.
 337   void MakeSureStackPagesMapped(int offset);
 338 #endif
 339
 340   ZoneList<LEnvironment*> deoptimizations_;
 341   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 342   ZoneList<Handle<Object> > deoptimization_literals_;
 343   int inlined_function_count_;
 344   Scope* const scope_;
 345   TranslationBuffer translations_;
 346   ZoneList<LDeferredCode*> deferred_;
 347   int osr_pc_offset_;
 348   bool frame_is_built_;
 349
 350   // Builder that keeps track of safepoints in the code. The table
 351   // itself is emitted at the end of the generated code.
 352   SafepointTableBuilder safepoints_;
 353
 354   // Compiler from a set of parallel moves to a sequential list of moves.
 355   LGapResolver resolver_;
 356
 357   Safepoint::Kind expected_safepoint_kind_;
 358
 359   class PushSafepointRegistersScope V8_FINAL BASE_EMBEDDED {
 360    public:
 361     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 362         : codegen_(codegen) {
 363       ASSERT(codegen_->info()->is_calling());
 364       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 365       codegen_->masm_->PushSafepointRegisters();
 366       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 367     }
 368
 369     ~PushSafepointRegistersScope() {
 370       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 371       codegen_->masm_->PopSafepointRegisters();
 372       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 373     }
 374
 375    private:
 376     LCodeGen* codegen_;
 377   };
 378
 379   friend class LDeferredCode;
 380   friend class LEnvironment;
 381   friend class SafepointGenerator;
 382   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 383 };
 384
 385
 386 class LDeferredCode: public ZoneObject {
 387  public:
 388   explicit LDeferredCode(LCodeGen* codegen)
 389       : codegen_(codegen),
 390         external_exit_(NULL),
 391         instruction_index_(codegen->current_instruction_) {
 392     codegen->AddDeferredCode(this);
 393   }
 394
 395   virtual ~LDeferredCode() {}
 396   virtual void Generate() = 0;
 397   virtual LInstruction* instr() = 0;
 398
 399   void SetExit(Label* exit) { external_exit_ = exit; }
 400   Label* entry() { return &entry_; }
 401   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 402   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
 403   int instruction_index() const { return instruction_index_; }
 404
 405  protected:
 406   LCodeGen* codegen() const { return codegen_; }
 407   MacroAssembler* masm() const { return codegen_->masm(); }
 408
 409  private:
 410   LCodeGen* codegen_;
 411   Label entry_;
 412   Label exit_;
 413   Label done_;
 414   Label* external_exit_;
 415   int instruction_index_;
 416 };
 417
 418 } }  // namespace v8::internal
 419
 420 #endif  // V8_X64_LITHIUM_CODEGEN_X64_H_