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/checks.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) V8_OVERRIDE;
 152   void GenerateBodyInstructionPost(LInstruction* instr) V8_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,
 213                     LEnvironment* environment,
 214                     Deoptimizer::BailoutType bailout_type);
 215   void DeoptimizeIf(Condition cc, LEnvironment* environment);
 216
 217   bool DeoptEveryNTimes() {
 218     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
 219   }
 220
 221   void AddToTranslation(LEnvironment* environment,
 222                         Translation* translation,
 223                         LOperand* op,
 224                         bool is_tagged,
 225                         bool is_uint32,
 226                         int* object_index_pointer,
 227                         int* dematerialized_index_pointer);
 228   void PopulateDeoptimizationData(Handle<Code> code);
 229   int DefineDeoptimizationLiteral(Handle<Object> literal);
 230
 231   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 232
 233   Register ToRegister(int index) const;
 234   XMMRegister ToDoubleRegister(int index) const;
 235   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
 236   int32_t ToInteger32(LConstantOperand* op) const;
 237   ExternalReference ToExternalReference(LConstantOperand* op) const;
 238
 239   Operand BuildFastArrayOperand(LOperand* elements_pointer,
 240                                 LOperand* key,
 241                                 Representation key_representation,
 242                                 ElementsKind elements_kind,
 243                                 uint32_t base_offset);
 244
 245   Operand BuildSeqStringOperand(Register string,
 246                                 LOperand* index,
 247                                 String::Encoding encoding);
 248
 249   void EmitIntegerMathAbs(LMathAbs* instr);
 250
 251   // Support for recording safepoint and position information.
 252   void RecordSafepoint(LPointerMap* pointers,
 253                        Safepoint::Kind kind,
 254                        int arguments,
 255                        Safepoint::DeoptMode mode);
 256   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 257   void RecordSafepoint(Safepoint::DeoptMode mode);
 258   void RecordSafepointWithRegisters(LPointerMap* pointers,
 259                                     int arguments,
 260                                     Safepoint::DeoptMode mode);
 261
 262   void RecordAndWritePosition(int position) V8_OVERRIDE;
 263
 264   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 265   void EmitGoto(int block);
 266
 267   // EmitBranch expects to be the last instruction of a block.
 268   template<class InstrType>
 269   void EmitBranch(InstrType instr, Condition cc);
 270   template<class InstrType>
 271   void EmitFalseBranch(InstrType instr, Condition cc);
 272   void EmitNumberUntagD(
 273       Register input,
 274       Register temp,
 275       XMMRegister result,
 276       bool allow_undefined_as_nan,
 277       bool deoptimize_on_minus_zero,
 278       LEnvironment* env,
 279       NumberUntagDMode mode = NUMBER_CANDIDATE_IS_ANY_TAGGED);
 280
 281   // Emits optimized code for typeof x == "y".  Modifies input register.
 282   // Returns the condition on which a final split to
 283   // true and false label should be made, to optimize fallthrough.
 284   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
 285
 286   // Emits optimized code for %_IsObject(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 EmitIsObject(Register input,
 290                          Register temp1,
 291                          Label* is_not_object,
 292                          Label* is_object);
 293
 294   // Emits optimized code for %_IsString(x).  Preserves input register.
 295   // Returns the condition on which a final split to
 296   // true and false label should be made, to optimize fallthrough.
 297   Condition EmitIsString(Register input,
 298                          Register temp1,
 299                          Label* is_not_string,
 300                          SmiCheck check_needed);
 301
 302   // Emits optimized code for %_IsConstructCall().
 303   // Caller should branch on equal condition.
 304   void EmitIsConstructCall(Register temp);
 305
 306   // Emits optimized code to deep-copy the contents of statically known
 307   // object graphs (e.g. object literal boilerplate).
 308   void EmitDeepCopy(Handle<JSObject> object,
 309                     Register result,
 310                     Register source,
 311                     int* offset,
 312                     AllocationSiteMode mode);
 313
 314   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 315   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 316   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 317   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 318   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 319   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 320   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 321
 322   void EmitReturn(LReturn* instr, bool dynamic_frame_alignment);
 323
 324   // Emits code for pushing either a tagged constant, a (non-double)
 325   // register, or a stack slot operand.
 326   void EmitPushTaggedOperand(LOperand* operand);
 327
 328   friend class LGapResolver;
 329
 330 #ifdef _MSC_VER
 331   // On windows, you may not access the stack more than one page below
 332   // the most recently mapped page. To make the allocated area randomly
 333   // accessible, we write an arbitrary value to each page in range
 334   // esp + offset - page_size .. esp in turn.
 335   void MakeSureStackPagesMapped(int offset);
 336 #endif
 337
 338   ZoneList<LEnvironment*> deoptimizations_;
 339   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 340   ZoneList<Handle<Object> > deoptimization_literals_;
 341   int inlined_function_count_;
 342   Scope* const scope_;
 343   TranslationBuffer translations_;
 344   ZoneList<LDeferredCode*> deferred_;
 345   bool dynamic_frame_alignment_;
 346   bool support_aligned_spilled_doubles_;
 347   int osr_pc_offset_;
 348   bool frame_is_built_;
 349
 350   // Builder that keeps track of safepoints in the code. The table
 351   // itself is emitted at the end of the generated code.
 352   SafepointTableBuilder safepoints_;
 353
 354   // Compiler from a set of parallel moves to a sequential list of moves.
 355   LGapResolver resolver_;
 356
 357   Safepoint::Kind expected_safepoint_kind_;
 358
 359   class PushSafepointRegistersScope V8_FINAL  BASE_EMBEDDED {
 360    public:
 361     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 362         : codegen_(codegen) {
 363       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 364       codegen_->masm_->PushSafepointRegisters();
 365       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 366       ASSERT(codegen_->info()->is_calling());
 367     }
 368
 369     ~PushSafepointRegistersScope() {
 370       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 371       codegen_->masm_->PopSafepointRegisters();
 372       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 373     }
 374
 375    private:
 376     LCodeGen* codegen_;
 377   };
 378
 379   friend class LDeferredCode;
 380   friend class LEnvironment;
 381   friend class SafepointGenerator;
 382   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 383 };
 384
 385
 386 class LDeferredCode : public ZoneObject {
 387  public:
 388   explicit LDeferredCode(LCodeGen* codegen)
 389       : codegen_(codegen),
 390         external_exit_(NULL),
 391         instruction_index_(codegen->current_instruction_) {
 392     codegen->AddDeferredCode(this);
 393   }
 394
 395   virtual ~LDeferredCode() {}
 396   virtual void Generate() = 0;
 397   virtual LInstruction* instr() = 0;
 398
 399   void SetExit(Label* exit) { external_exit_ = exit; }
 400   Label* entry() { return &entry_; }
 401   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 402   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
 403   int instruction_index() const { return instruction_index_; }
 404
 405  protected:
 406   LCodeGen* codegen() const { return codegen_; }
 407   MacroAssembler* masm() const { return codegen_->masm(); }
 408
 409  private:
 410   LCodeGen* codegen_;
 411   Label entry_;
 412   Label exit_;
 413   Label* external_exit_;
 414   Label done_;
 415   int instruction_index_;
 416 };
 417
 418 } }  // namespace v8::internal
 419
 420 #endif  // V8_IA32_LITHIUM_CODEGEN_IA32_H_