src/v8/src/ia32/lithium-codegen-ia32.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_IA32_LITHIUM_CODEGEN_IA32_H_
   6 #define V8_IA32_LITHIUM_CODEGEN_IA32_H_
   7
   8 #include "src/ia32/lithium-ia32.h"
   9
  10 #include "src/base/logging.h"
  11 #include "src/deoptimizer.h"
  12 #include "src/ia32/lithium-gap-resolver-ia32.h"
  13 #include "src/lithium-codegen.h"
  14 #include "src/safepoint-table.h"
  15 #include "src/scopes.h"
  16 #include "src/utils.h"
  17
  18 namespace v8 {
  19 namespace internal {
  20
  21 // Forward declarations.
  22 class LDeferredCode;
  23 class LGapNode;
  24 class SafepointGenerator;
  25
  26 class LCodeGen: public LCodeGenBase {
  27  public:
  28   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
  29       : LCodeGenBase(chunk, assembler, info),
  30         deoptimizations_(4, info->zone()),
  31         jump_table_(4, info->zone()),
  32         deoptimization_literals_(8, info->zone()),
  33         inlined_function_count_(0),
  34         scope_(info->scope()),
  35         translations_(info->zone()),
  36         deferred_(8, info->zone()),
  37         dynamic_frame_alignment_(false),
  38         support_aligned_spilled_doubles_(false),
  39         osr_pc_offset_(-1),
  40         frame_is_built_(false),
  41         safepoints_(info->zone()),
  42         resolver_(this),
  43         expected_safepoint_kind_(Safepoint::kSimple) {
  44     PopulateDeoptimizationLiteralsWithInlinedFunctions();
  45   }
  46
  47   int LookupDestination(int block_id) const {
  48     return chunk()->LookupDestination(block_id);
  49   }
  50
  51   bool IsNextEmittedBlock(int block_id) const {
  52     return LookupDestination(block_id) == GetNextEmittedBlock();
  53   }
  54
  55   bool NeedsEagerFrame() const {
  56     return GetStackSlotCount() > 0 ||
  57         info()->is_non_deferred_calling() ||
  58         !info()->IsStub() ||
  59         info()->requires_frame();
  60   }
  61   bool NeedsDeferredFrame() const {
  62     return !NeedsEagerFrame() && info()->is_deferred_calling();
  63   }
  64
  65   // Support for converting LOperands to assembler types.
  66   Operand ToOperand(LOperand* op) const;
  67   Register ToRegister(LOperand* op) const;
  68   XMMRegister ToDoubleRegister(LOperand* op) const;
  69   XMMRegister ToFloat32x4Register(LOperand* op) const;
  70   XMMRegister ToFloat64x2Register(LOperand* op) const;
  71   XMMRegister ToInt32x4Register(LOperand* op) const;
  72   XMMRegister ToSIMD128Register(LOperand* op) const;
  73
  74   bool IsInteger32(LConstantOperand* op) const;
  75   bool IsSmi(LConstantOperand* op) const;
  76   Immediate ToImmediate(LOperand* op, const Representation& r) const {
  77     return Immediate(ToRepresentation(LConstantOperand::cast(op), r));
  78   }
  79   double ToDouble(LConstantOperand* op) const;
  80
  81   Handle<Object> ToHandle(LConstantOperand* op) const;
  82
  83   // The operand denoting the second word (the one with a higher address) of
  84   // a double stack slot.
  85   Operand HighOperand(LOperand* op);
  86
  87   // Try to generate code for the entire chunk, but it may fail if the
  88   // chunk contains constructs we cannot handle. Returns true if the
  89   // code generation attempt succeeded.
  90   bool GenerateCode();
  91
  92   // Finish the code by setting stack height, safepoint, and bailout
  93   // information on it.
  94   void FinishCode(Handle<Code> code);
  95
  96   // Deferred code support.
  97   void DoDeferredNumberTagD(LNumberTagD* instr);
  98
  99   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
 100   void DoDeferredNumberTagIU(LInstruction* instr,
 101                              LOperand* value,
 102                              LOperand* temp,
 103                              IntegerSignedness signedness);
 104
 105   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
 106   void DoDeferredFloat32x4ToTagged(LInstruction* instr);
 107   void DoDeferredInt32x4ToTagged(LInstruction* instr);
 108   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
 109   void DoDeferredStackCheck(LStackCheck* instr);
 110   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 111   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 112   void DoDeferredAllocate(LAllocate* instr);
 113   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 114                                        Label* map_check);
 115   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 116   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 117                                    Register object,
 118                                    Register index);
 119   void DoDeferredSIMD128ToTagged(LInstruction* instr, Runtime::FunctionId id);
 120
 121   template<class T>
 122   void HandleTaggedToSIMD128(LTaggedToSIMD128* instr);
 123   template<class T>
 124   void HandleSIMD128ToTagged(LSIMD128ToTagged* instr);
 125
 126   // Parallel move support.
 127   void DoParallelMove(LParallelMove* move);
 128   void DoGap(LGap* instr);
 129
 130   // Emit frame translation commands for an environment.
 131   void WriteTranslation(LEnvironment* environment, Translation* translation);
 132
 133   void EnsureRelocSpaceForDeoptimization();
 134
 135   // Declare methods that deal with the individual node types.
 136 #define DECLARE_DO(type) void Do##type(L##type* node);
 137   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 138 #undef DECLARE_DO
 139
 140  private:
 141   StrictMode strict_mode() const { return info()->strict_mode(); }
 142
 143   Scope* scope() const { return scope_; }
 144
 145   XMMRegister double_scratch0() const { return xmm0; }
 146
 147   void EmitClassOfTest(Label* if_true,
 148                        Label* if_false,
 149                        Handle<String> class_name,
 150                        Register input,
 151                        Register temporary,
 152                        Register temporary2);
 153
 154   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 155
 156   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 157
 158   void SaveCallerDoubles();
 159   void RestoreCallerDoubles();
 160
 161   // Code generation passes.  Returns true if code generation should
 162   // continue.
 163   void GenerateBodyInstructionPre(LInstruction* instr) V8_OVERRIDE;
 164   void GenerateBodyInstructionPost(LInstruction* instr) V8_OVERRIDE;
 165   bool GeneratePrologue();
 166   bool GenerateDeferredCode();
 167   bool GenerateJumpTable();
 168   bool GenerateSafepointTable();
 169
 170   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 171   void GenerateOsrPrologue();
 172
 173   enum SafepointMode {
 174     RECORD_SIMPLE_SAFEPOINT,
 175     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 176   };
 177
 178   void CallCode(Handle<Code> code,
 179                 RelocInfo::Mode mode,
 180                 LInstruction* instr);
 181
 182   void CallCodeGeneric(Handle<Code> code,
 183                        RelocInfo::Mode mode,
 184                        LInstruction* instr,
 185                        SafepointMode safepoint_mode);
 186
 187   void CallRuntime(const Runtime::Function* fun,
 188                    int argc,
 189                    LInstruction* instr,
 190                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 191
 192   void CallRuntime(Runtime::FunctionId id,
 193                    int argc,
 194                    LInstruction* instr) {
 195     const Runtime::Function* function = Runtime::FunctionForId(id);
 196     CallRuntime(function, argc, instr);
 197   }
 198
 199   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 200                                int argc,
 201                                LInstruction* instr,
 202                                LOperand* context);
 203
 204   void LoadContextFromDeferred(LOperand* context);
 205
 206   enum EDIState {
 207     EDI_UNINITIALIZED,
 208     EDI_CONTAINS_TARGET
 209   };
 210
 211   // Generate a direct call to a known function.  Expects the function
 212   // to be in edi.
 213   void CallKnownFunction(Handle<JSFunction> function,
 214                          int formal_parameter_count,
 215                          int arity,
 216                          LInstruction* instr,
 217                          EDIState edi_state);
 218
 219   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 220                                     SafepointMode safepoint_mode);
 221
 222   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 223                                             Safepoint::DeoptMode mode);
 224   void DeoptimizeIf(Condition cc,
 225                     LEnvironment* environment,
 226                     Deoptimizer::BailoutType bailout_type);
 227   void DeoptimizeIf(Condition cc, LEnvironment* environment);
 228
 229   bool DeoptEveryNTimes() {
 230     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
 231   }
 232
 233   void AddToTranslation(LEnvironment* environment,
 234                         Translation* translation,
 235                         LOperand* op,
 236                         bool is_tagged,
 237                         bool is_uint32,
 238                         int* object_index_pointer,
 239                         int* dematerialized_index_pointer);
 240   void PopulateDeoptimizationData(Handle<Code> code);
 241   int DefineDeoptimizationLiteral(Handle<Object> literal);
 242
 243   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 244
 245   Register ToRegister(int index) const;
 246   XMMRegister ToDoubleRegister(int index) const;
 247   XMMRegister ToFloat32x4Register(int index) const;
 248   XMMRegister ToFloat64x2Register(int index) const;
 249   XMMRegister ToInt32x4Register(int index) const;
 250   XMMRegister ToSIMD128Register(int index) const;
 251   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
 252   int32_t ToInteger32(LConstantOperand* op) const;
 253   ExternalReference ToExternalReference(LConstantOperand* op) const;
 254
 255   Operand BuildFastArrayOperand(LOperand* elements_pointer,
 256                                 LOperand* key,
 257                                 Representation key_representation,
 258                                 ElementsKind elements_kind,
 259                                 uint32_t base_offset);
 260
 261   Operand BuildSeqStringOperand(Register string,
 262                                 LOperand* index,
 263                                 String::Encoding encoding);
 264
 265   void EmitIntegerMathAbs(LMathAbs* instr);
 266
 267   // Support for recording safepoint and position information.
 268   void RecordSafepoint(LPointerMap* pointers,
 269                        Safepoint::Kind kind,
 270                        int arguments,
 271                        Safepoint::DeoptMode mode);
 272   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 273   void RecordSafepoint(Safepoint::DeoptMode mode);
 274   void RecordSafepointWithRegisters(LPointerMap* pointers,
 275                                     int arguments,
 276                                     Safepoint::DeoptMode mode);
 277
 278   void RecordAndWritePosition(int position) V8_OVERRIDE;
 279
 280   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 281   void EmitGoto(int block);
 282
 283   // EmitBranch expects to be the last instruction of a block.
 284   template<class InstrType>
 285   void EmitBranch(InstrType instr, Condition cc);
 286   template<class InstrType>
 287   void EmitFalseBranch(InstrType instr, Condition cc);
 288   void EmitNumberUntagD(
 289       Register input,
 290       Register temp,
 291       XMMRegister result,
 292       bool allow_undefined_as_nan,
 293       bool deoptimize_on_minus_zero,
 294       LEnvironment* env,
 295       NumberUntagDMode mode = NUMBER_CANDIDATE_IS_ANY_TAGGED);
 296
 297   // Emits optimized code for typeof x == "y".  Modifies input register.
 298   // Returns the condition on which a final split to
 299   // true and false label should be made, to optimize fallthrough.
 300   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
 301
 302   // Emits optimized code for %_IsObject(x).  Preserves input register.
 303   // Returns the condition on which a final split to
 304   // true and false label should be made, to optimize fallthrough.
 305   Condition EmitIsObject(Register input,
 306                          Register temp1,
 307                          Label* is_not_object,
 308                          Label* is_object);
 309
 310   // Emits optimized code for %_IsString(x).  Preserves input register.
 311   // Returns the condition on which a final split to
 312   // true and false label should be made, to optimize fallthrough.
 313   Condition EmitIsString(Register input,
 314                          Register temp1,
 315                          Label* is_not_string,
 316                          SmiCheck check_needed);
 317
 318   // Emits optimized code for %_IsConstructCall().
 319   // Caller should branch on equal condition.
 320   void EmitIsConstructCall(Register temp);
 321
 322   // Emits optimized code to deep-copy the contents of statically known
 323   // object graphs (e.g. object literal boilerplate).
 324   void EmitDeepCopy(Handle<JSObject> object,
 325                     Register result,
 326                     Register source,
 327                     int* offset,
 328                     AllocationSiteMode mode);
 329
 330   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 331   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 332   void HandleExternalArrayOpRequiresTemp(LOperand* key,
 333                                          Representation key_representation,
 334                                          ElementsKind elements_kind);
 335   template<class T>
 336   void DoLoadKeyedSIMD128ExternalArray(LLoadKeyed* instr);
 337   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 338   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 339   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 340   template<class T>
 341   void DoStoreKeyedSIMD128ExternalArray(LStoreKeyed* instr);
 342   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 343   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 344
 345   void EmitReturn(LReturn* instr, bool dynamic_frame_alignment);
 346
 347   // Emits code for pushing either a tagged constant, a (non-double)
 348   // register, or a stack slot operand.
 349   void EmitPushTaggedOperand(LOperand* operand);
 350
 351   friend class LGapResolver;
 352
 353 #ifdef _MSC_VER
 354   // On windows, you may not access the stack more than one page below
 355   // the most recently mapped page. To make the allocated area randomly
 356   // accessible, we write an arbitrary value to each page in range
 357   // esp + offset - page_size .. esp in turn.
 358   void MakeSureStackPagesMapped(int offset);
 359 #endif
 360
 361   ZoneList<LEnvironment*> deoptimizations_;
 362   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 363   ZoneList<Handle<Object> > deoptimization_literals_;
 364   int inlined_function_count_;
 365   Scope* const scope_;
 366   TranslationBuffer translations_;
 367   ZoneList<LDeferredCode*> deferred_;
 368   bool dynamic_frame_alignment_;
 369   bool support_aligned_spilled_doubles_;
 370   int osr_pc_offset_;
 371   bool frame_is_built_;
 372
 373   // Builder that keeps track of safepoints in the code. The table
 374   // itself is emitted at the end of the generated code.
 375   SafepointTableBuilder safepoints_;
 376
 377   // Compiler from a set of parallel moves to a sequential list of moves.
 378   LGapResolver resolver_;
 379
 380   Safepoint::Kind expected_safepoint_kind_;
 381
 382   class PushSafepointRegistersScope V8_FINAL  BASE_EMBEDDED {
 383    public:
 384     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 385         : codegen_(codegen) {
 386       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 387       codegen_->masm_->PushSafepointRegisters();
 388       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 389       DCHECK(codegen_->info()->is_calling());
 390     }
 391
 392     ~PushSafepointRegistersScope() {
 393       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 394       codegen_->masm_->PopSafepointRegisters();
 395       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 396     }
 397
 398    private:
 399     LCodeGen* codegen_;
 400   };
 401
 402   friend class LDeferredCode;
 403   friend class LEnvironment;
 404   friend class SafepointGenerator;
 405   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 406 };
 407
 408
 409 class LDeferredCode : public ZoneObject {
 410  public:
 411   explicit LDeferredCode(LCodeGen* codegen)
 412       : codegen_(codegen),
 413         external_exit_(NULL),
 414         instruction_index_(codegen->current_instruction_) {
 415     codegen->AddDeferredCode(this);
 416   }
 417
 418   virtual ~LDeferredCode() {}
 419   virtual void Generate() = 0;
 420   virtual LInstruction* instr() = 0;
 421
 422   void SetExit(Label* exit) { external_exit_ = exit; }
 423   Label* entry() { return &entry_; }
 424   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 425   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
 426   int instruction_index() const { return instruction_index_; }
 427
 428  protected:
 429   LCodeGen* codegen() const { return codegen_; }
 430   MacroAssembler* masm() const { return codegen_->masm(); }
 431
 432  private:
 433   LCodeGen* codegen_;
 434   Label entry_;
 435   Label exit_;
 436   Label* external_exit_;
 437   Label done_;
 438   int instruction_index_;
 439 };
 440
 441 } }  // namespace v8::internal
 442
 443 #endif  // V8_IA32_LITHIUM_CODEGEN_IA32_H_