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   bool IsInteger32Constant(LConstantOperand* op) const;
  66   bool IsDehoistedKeyConstant(LConstantOperand* op) const;
  67   bool IsSmiConstant(LConstantOperand* op) const;
  68   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
  69   int32_t ToInteger32(LConstantOperand* op) const;
  70   Smi* ToSmi(LConstantOperand* op) const;
  71   double ToDouble(LConstantOperand* op) const;
  72   ExternalReference ToExternalReference(LConstantOperand* op) const;
  73   Handle<Object> ToHandle(LConstantOperand* op) const;
  74   Operand ToOperand(LOperand* op) const;
  75
  76   // Try to generate code for the entire chunk, but it may fail if the
  77   // chunk contains constructs we cannot handle. Returns true if the
  78   // code generation attempt succeeded.
  79   bool GenerateCode();
  80
  81   // Finish the code by setting stack height, safepoint, and bailout
  82   // information on it.
  83   void FinishCode(Handle<Code> code);
  84
  85   // Deferred code support.
  86   void DoDeferredNumberTagD(LNumberTagD* instr);
  87
  88   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
  89   void DoDeferredNumberTagIU(LInstruction* instr,
  90                              LOperand* value,
  91                              LOperand* temp1,
  92                              LOperand* temp2,
  93                              IntegerSignedness signedness);
  94
  95   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
  96   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
  97   void DoDeferredStackCheck(LStackCheck* instr);
  98   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
  99   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 100   void DoDeferredAllocate(LAllocate* instr);
 101   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 102                                        Label* map_check);
 103   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 104   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 105                                    Register object,
 106                                    Register index);
 107
 108 // Parallel move support.
 109   void DoParallelMove(LParallelMove* move);
 110   void DoGap(LGap* instr);
 111
 112   // Emit frame translation commands for an environment.
 113   void WriteTranslation(LEnvironment* environment, Translation* translation);
 114
 115   // Declare methods that deal with the individual node types.
 116 #define DECLARE_DO(type) void Do##type(L##type* node);
 117   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 118 #undef DECLARE_DO
 119
 120  private:
 121   StrictMode strict_mode() const { return info()->strict_mode(); }
 122
 123   LPlatformChunk* chunk() const { return chunk_; }
 124   Scope* scope() const { return scope_; }
 125   HGraph* graph() const { return chunk()->graph(); }
 126
 127   XMMRegister double_scratch0() const { return xmm0; }
 128
 129   void EmitClassOfTest(Label* if_true,
 130                        Label* if_false,
 131                        Handle<String> class_name,
 132                        Register input,
 133                        Register temporary,
 134                        Register scratch);
 135
 136   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 137
 138   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 139
 140
 141   void SaveCallerDoubles();
 142   void RestoreCallerDoubles();
 143
 144   // Code generation passes.  Returns true if code generation should
 145   // continue.
 146   void GenerateBodyInstructionPre(LInstruction* instr) V8_OVERRIDE;
 147   void GenerateBodyInstructionPost(LInstruction* instr) V8_OVERRIDE;
 148   bool GeneratePrologue();
 149   bool GenerateDeferredCode();
 150   bool GenerateJumpTable();
 151   bool GenerateSafepointTable();
 152
 153   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 154   void GenerateOsrPrologue();
 155
 156   enum SafepointMode {
 157     RECORD_SIMPLE_SAFEPOINT,
 158     RECORD_SAFEPOINT_WITH_REGISTERS
 159   };
 160
 161   void CallCodeGeneric(Handle<Code> code,
 162                        RelocInfo::Mode mode,
 163                        LInstruction* instr,
 164                        SafepointMode safepoint_mode,
 165                        int argc);
 166
 167
 168   void CallCode(Handle<Code> code,
 169                 RelocInfo::Mode mode,
 170                 LInstruction* instr);
 171
 172   void CallRuntime(const Runtime::Function* function,
 173                    int num_arguments,
 174                    LInstruction* instr,
 175                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 176
 177   void CallRuntime(Runtime::FunctionId id,
 178                    int num_arguments,
 179                    LInstruction* instr) {
 180     const Runtime::Function* function = Runtime::FunctionForId(id);
 181     CallRuntime(function, num_arguments, instr);
 182   }
 183
 184   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 185                                int argc,
 186                                LInstruction* instr,
 187                                LOperand* context);
 188
 189   void LoadContextFromDeferred(LOperand* context);
 190
 191   enum RDIState {
 192     RDI_UNINITIALIZED,
 193     RDI_CONTAINS_TARGET
 194   };
 195
 196   // Generate a direct call to a known function.  Expects the function
 197   // to be in rdi.
 198   void CallKnownFunction(Handle<JSFunction> function,
 199                          int formal_parameter_count,
 200                          int arity,
 201                          LInstruction* instr,
 202                          RDIState rdi_state);
 203
 204   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 205                                     SafepointMode safepoint_mode,
 206                                     int argc);
 207   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 208                                             Safepoint::DeoptMode mode);
 209   void DeoptimizeIf(Condition cc,
 210                     LEnvironment* environment,
 211                     Deoptimizer::BailoutType bailout_type);
 212   void DeoptimizeIf(Condition cc, LEnvironment* environment);
 213
 214   bool DeoptEveryNTimes() {
 215     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
 216   }
 217
 218   void AddToTranslation(LEnvironment* environment,
 219                         Translation* translation,
 220                         LOperand* op,
 221                         bool is_tagged,
 222                         bool is_uint32,
 223                         int* object_index_pointer,
 224                         int* dematerialized_index_pointer);
 225   void PopulateDeoptimizationData(Handle<Code> code);
 226   int DefineDeoptimizationLiteral(Handle<Object> literal);
 227
 228   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 229
 230   Register ToRegister(int index) const;
 231   XMMRegister ToDoubleRegister(int index) const;
 232   Operand BuildFastArrayOperand(
 233       LOperand* elements_pointer,
 234       LOperand* key,
 235       Representation key_representation,
 236       ElementsKind elements_kind,
 237       uint32_t base_offset);
 238
 239   Operand BuildSeqStringOperand(Register string,
 240                                 LOperand* index,
 241                                 String::Encoding encoding);
 242
 243   void EmitIntegerMathAbs(LMathAbs* instr);
 244   void EmitSmiMathAbs(LMathAbs* instr);
 245
 246   // Support for recording safepoint and position information.
 247   void RecordSafepoint(LPointerMap* pointers,
 248                        Safepoint::Kind kind,
 249                        int arguments,
 250                        Safepoint::DeoptMode mode);
 251   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 252   void RecordSafepoint(Safepoint::DeoptMode mode);
 253   void RecordSafepointWithRegisters(LPointerMap* pointers,
 254                                     int arguments,
 255                                     Safepoint::DeoptMode mode);
 256   void RecordAndWritePosition(int position) V8_OVERRIDE;
 257
 258   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 259   void EmitGoto(int block);
 260
 261   // EmitBranch expects to be the last instruction of a block.
 262   template<class InstrType>
 263   void EmitBranch(InstrType instr, Condition cc);
 264   template<class InstrType>
 265   void EmitFalseBranch(InstrType instr, Condition cc);
 266   void EmitNumberUntagD(
 267       Register input,
 268       XMMRegister result,
 269       bool allow_undefined_as_nan,
 270       bool deoptimize_on_minus_zero,
 271       LEnvironment* env,
 272       NumberUntagDMode mode = NUMBER_CANDIDATE_IS_ANY_TAGGED);
 273
 274   // Emits optimized code for typeof x == "y".  Modifies input register.
 275   // Returns the condition on which a final split to
 276   // true and false label should be made, to optimize fallthrough.
 277   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
 278
 279   // Emits optimized code for %_IsObject(x).  Preserves input register.
 280   // Returns the condition on which a final split to
 281   // true and false label should be made, to optimize fallthrough.
 282   Condition EmitIsObject(Register input,
 283                          Label* is_not_object,
 284                          Label* is_object);
 285
 286   // Emits optimized code for %_IsString(x).  Preserves 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 EmitIsString(Register input,
 290                          Register temp1,
 291                          Label* is_not_string,
 292                          SmiCheck check_needed);
 293
 294   // Emits optimized code for %_IsConstructCall().
 295   // Caller should branch on equal condition.
 296   void EmitIsConstructCall(Register temp);
 297
 298   // Emits code for pushing either a tagged constant, a (non-double)
 299   // register, or a stack slot operand.
 300   void EmitPushTaggedOperand(LOperand* operand);
 301
 302   // Emits optimized code to deep-copy the contents of statically known
 303   // object graphs (e.g. object literal boilerplate).
 304   void EmitDeepCopy(Handle<JSObject> object,
 305                     Register result,
 306                     Register source,
 307                     int* offset,
 308                     AllocationSiteMode mode);
 309
 310   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 311   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 312   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 313   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 314   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 315   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 316   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 317 #ifdef _MSC_VER
 318   // On windows, you may not access the stack more than one page below
 319   // the most recently mapped page. To make the allocated area randomly
 320   // accessible, we write an arbitrary value to each page in range
 321   // rsp + offset - page_size .. rsp in turn.
 322   void MakeSureStackPagesMapped(int offset);
 323 #endif
 324
 325   ZoneList<LEnvironment*> deoptimizations_;
 326   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 327   ZoneList<Handle<Object> > deoptimization_literals_;
 328   int inlined_function_count_;
 329   Scope* const scope_;
 330   TranslationBuffer translations_;
 331   ZoneList<LDeferredCode*> deferred_;
 332   int osr_pc_offset_;
 333   bool frame_is_built_;
 334
 335   // Builder that keeps track of safepoints in the code. The table
 336   // itself is emitted at the end of the generated code.
 337   SafepointTableBuilder safepoints_;
 338
 339   // Compiler from a set of parallel moves to a sequential list of moves.
 340   LGapResolver resolver_;
 341
 342   Safepoint::Kind expected_safepoint_kind_;
 343
 344   class PushSafepointRegistersScope V8_FINAL BASE_EMBEDDED {
 345    public:
 346     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 347         : codegen_(codegen) {
 348       DCHECK(codegen_->info()->is_calling());
 349       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 350       codegen_->masm_->PushSafepointRegisters();
 351       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 352     }
 353
 354     ~PushSafepointRegistersScope() {
 355       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 356       codegen_->masm_->PopSafepointRegisters();
 357       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 358     }
 359
 360    private:
 361     LCodeGen* codegen_;
 362   };
 363
 364   friend class LDeferredCode;
 365   friend class LEnvironment;
 366   friend class SafepointGenerator;
 367   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 368 };
 369
 370
 371 class LDeferredCode: public ZoneObject {
 372  public:
 373   explicit LDeferredCode(LCodeGen* codegen)
 374       : codegen_(codegen),
 375         external_exit_(NULL),
 376         instruction_index_(codegen->current_instruction_) {
 377     codegen->AddDeferredCode(this);
 378   }
 379
 380   virtual ~LDeferredCode() {}
 381   virtual void Generate() = 0;
 382   virtual LInstruction* instr() = 0;
 383
 384   void SetExit(Label* exit) { external_exit_ = exit; }
 385   Label* entry() { return &entry_; }
 386   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 387   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
 388   int instruction_index() const { return instruction_index_; }
 389
 390  protected:
 391   LCodeGen* codegen() const { return codegen_; }
 392   MacroAssembler* masm() const { return codegen_->masm(); }
 393
 394  private:
 395   LCodeGen* codegen_;
 396   Label entry_;
 397   Label exit_;
 398   Label done_;
 399   Label* external_exit_;
 400   int instruction_index_;
 401 };
 402
 403 } }  // namespace v8::internal
 404
 405 #endif  // V8_X64_LITHIUM_CODEGEN_X64_H_