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