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