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