src/x87/lithium-codegen-x87.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_X87_LITHIUM_CODEGEN_X87_H_
   6 #define V8_X87_LITHIUM_CODEGEN_X87_H_
   7
   8 #include "src/x87/lithium-x87.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/x87/lithium-gap-resolver-x87.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         x87_stack_(assembler),
  42         safepoints_(info->zone()),
  43         resolver_(this),
  44         expected_safepoint_kind_(Safepoint::kSimple) {
  45     PopulateDeoptimizationLiteralsWithInlinedFunctions();
  46   }
  47
  48   int LookupDestination(int block_id) const {
  49     return chunk()->LookupDestination(block_id);
  50   }
  51
  52   bool IsNextEmittedBlock(int block_id) const {
  53     return LookupDestination(block_id) == GetNextEmittedBlock();
  54   }
  55
  56   bool NeedsEagerFrame() const {
  57     return GetStackSlotCount() > 0 ||
  58         info()->is_non_deferred_calling() ||
  59         !info()->IsStub() ||
  60         info()->requires_frame();
  61   }
  62   bool NeedsDeferredFrame() const {
  63     return !NeedsEagerFrame() && info()->is_deferred_calling();
  64   }
  65
  66   // Support for converting LOperands to assembler types.
  67   Operand ToOperand(LOperand* op) const;
  68   Register ToRegister(LOperand* op) const;
  69   X87Register ToX87Register(LOperand* op) const;
  70
  71   bool IsInteger32(LConstantOperand* op) const;
  72   bool IsSmi(LConstantOperand* op) const;
  73   Immediate ToImmediate(LOperand* op, const Representation& r) const {
  74     return Immediate(ToRepresentation(LConstantOperand::cast(op), r));
  75   }
  76   double ToDouble(LConstantOperand* op) const;
  77
  78   // Support for non-sse2 (x87) floating point stack handling.
  79   // These functions maintain the mapping of physical stack registers to our
  80   // virtual registers between instructions.
  81   enum X87OperandType { kX87DoubleOperand, kX87FloatOperand, kX87IntOperand };
  82
  83   void X87Mov(X87Register reg, Operand src,
  84       X87OperandType operand = kX87DoubleOperand);
  85   void X87Mov(Operand src, X87Register reg,
  86       X87OperandType operand = kX87DoubleOperand);
  87
  88   void X87PrepareBinaryOp(
  89       X87Register left, X87Register right, X87Register result);
  90
  91   void X87LoadForUsage(X87Register reg);
  92   void X87LoadForUsage(X87Register reg1, X87Register reg2);
  93   void X87PrepareToWrite(X87Register reg) { x87_stack_.PrepareToWrite(reg); }
  94   void X87CommitWrite(X87Register reg) { x87_stack_.CommitWrite(reg); }
  95
  96   void X87Fxch(X87Register reg, int other_slot = 0) {
  97     x87_stack_.Fxch(reg, other_slot);
  98   }
  99   void X87Free(X87Register reg) {
 100     x87_stack_.Free(reg);
 101   }
 102
 103
 104   bool X87StackEmpty() {
 105     return x87_stack_.depth() == 0;
 106   }
 107
 108   Handle<Object> ToHandle(LConstantOperand* op) const;
 109
 110   // The operand denoting the second word (the one with a higher address) of
 111   // a double stack slot.
 112   Operand HighOperand(LOperand* op);
 113
 114   // Try to generate code for the entire chunk, but it may fail if the
 115   // chunk contains constructs we cannot handle. Returns true if the
 116   // code generation attempt succeeded.
 117   bool GenerateCode();
 118
 119   // Finish the code by setting stack height, safepoint, and bailout
 120   // information on it.
 121   void FinishCode(Handle<Code> code);
 122
 123   // Deferred code support.
 124   void DoDeferredNumberTagD(LNumberTagD* instr);
 125
 126   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
 127   void DoDeferredNumberTagIU(LInstruction* instr,
 128                              LOperand* value,
 129                              LOperand* temp,
 130                              IntegerSignedness signedness);
 131
 132   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
 133   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
 134   void DoDeferredStackCheck(LStackCheck* instr);
 135   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 136   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 137   void DoDeferredAllocate(LAllocate* instr);
 138   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 139                                        Label* map_check);
 140   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 141   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 142                                    Register object,
 143                                    Register index);
 144
 145   // Parallel move support.
 146   void DoParallelMove(LParallelMove* move);
 147   void DoGap(LGap* instr);
 148
 149   // Emit frame translation commands for an environment.
 150   void WriteTranslation(LEnvironment* environment, Translation* translation);
 151
 152   void EnsureRelocSpaceForDeoptimization();
 153
 154   // Declare methods that deal with the individual node types.
 155 #define DECLARE_DO(type) void Do##type(L##type* node);
 156   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 157 #undef DECLARE_DO
 158
 159  private:
 160   StrictMode strict_mode() const { return info()->strict_mode(); }
 161
 162   Scope* scope() const { return scope_; }
 163
 164   void EmitClassOfTest(Label* if_true,
 165                        Label* if_false,
 166                        Handle<String> class_name,
 167                        Register input,
 168                        Register temporary,
 169                        Register temporary2);
 170
 171   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 172
 173   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 174
 175   // Code generation passes.  Returns true if code generation should
 176   // continue.
 177   void GenerateBodyInstructionPre(LInstruction* instr) V8_OVERRIDE;
 178   void GenerateBodyInstructionPost(LInstruction* instr) V8_OVERRIDE;
 179   bool GeneratePrologue();
 180   bool GenerateDeferredCode();
 181   bool GenerateJumpTable();
 182   bool GenerateSafepointTable();
 183
 184   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 185   void GenerateOsrPrologue();
 186
 187   enum SafepointMode {
 188     RECORD_SIMPLE_SAFEPOINT,
 189     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 190   };
 191
 192   void CallCode(Handle<Code> code,
 193                 RelocInfo::Mode mode,
 194                 LInstruction* instr);
 195
 196   void CallCodeGeneric(Handle<Code> code,
 197                        RelocInfo::Mode mode,
 198                        LInstruction* instr,
 199                        SafepointMode safepoint_mode);
 200
 201   void CallRuntime(const Runtime::Function* fun,
 202                    int argc,
 203                    LInstruction* instr);
 204
 205   void CallRuntime(Runtime::FunctionId id,
 206                    int argc,
 207                    LInstruction* instr) {
 208     const Runtime::Function* function = Runtime::FunctionForId(id);
 209     CallRuntime(function, argc, instr);
 210   }
 211
 212   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 213                                int argc,
 214                                LInstruction* instr,
 215                                LOperand* context);
 216
 217   void LoadContextFromDeferred(LOperand* context);
 218
 219   enum EDIState {
 220     EDI_UNINITIALIZED,
 221     EDI_CONTAINS_TARGET
 222   };
 223
 224   // Generate a direct call to a known function.  Expects the function
 225   // to be in edi.
 226   void CallKnownFunction(Handle<JSFunction> function,
 227                          int formal_parameter_count,
 228                          int arity,
 229                          LInstruction* instr,
 230                          EDIState edi_state);
 231
 232   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 233                                     SafepointMode safepoint_mode);
 234
 235   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 236                                             Safepoint::DeoptMode mode);
 237   void DeoptimizeIf(Condition cc,
 238                     LEnvironment* environment,
 239                     Deoptimizer::BailoutType bailout_type);
 240   void DeoptimizeIf(Condition cc, LEnvironment* environment);
 241
 242   bool DeoptEveryNTimes() {
 243     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
 244   }
 245
 246   void AddToTranslation(LEnvironment* environment,
 247                         Translation* translation,
 248                         LOperand* op,
 249                         bool is_tagged,
 250                         bool is_uint32,
 251                         int* object_index_pointer,
 252                         int* dematerialized_index_pointer);
 253   void PopulateDeoptimizationData(Handle<Code> code);
 254   int DefineDeoptimizationLiteral(Handle<Object> literal);
 255
 256   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 257
 258   Register ToRegister(int index) const;
 259   X87Register ToX87Register(int index) const;
 260   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
 261   int32_t ToInteger32(LConstantOperand* op) const;
 262   ExternalReference ToExternalReference(LConstantOperand* op) const;
 263
 264   Operand BuildFastArrayOperand(LOperand* elements_pointer,
 265                                 LOperand* key,
 266                                 Representation key_representation,
 267                                 ElementsKind elements_kind,
 268                                 uint32_t base_offset);
 269
 270   Operand BuildSeqStringOperand(Register string,
 271                                 LOperand* index,
 272                                 String::Encoding encoding);
 273
 274   void EmitIntegerMathAbs(LMathAbs* instr);
 275
 276   // Support for recording safepoint and position information.
 277   void RecordSafepoint(LPointerMap* pointers,
 278                        Safepoint::Kind kind,
 279                        int arguments,
 280                        Safepoint::DeoptMode mode);
 281   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 282   void RecordSafepoint(Safepoint::DeoptMode mode);
 283   void RecordSafepointWithRegisters(LPointerMap* pointers,
 284                                     int arguments,
 285                                     Safepoint::DeoptMode mode);
 286
 287   void RecordAndWritePosition(int position) V8_OVERRIDE;
 288
 289   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 290   void EmitGoto(int block);
 291
 292   // EmitBranch expects to be the last instruction of a block.
 293   template<class InstrType>
 294   void EmitBranch(InstrType instr, Condition cc);
 295   template<class InstrType>
 296   void EmitFalseBranch(InstrType instr, Condition cc);
 297   void EmitNumberUntagDNoSSE2(
 298       Register input,
 299       Register temp,
 300       X87Register res_reg,
 301       bool allow_undefined_as_nan,
 302       bool deoptimize_on_minus_zero,
 303       LEnvironment* env,
 304       NumberUntagDMode mode = NUMBER_CANDIDATE_IS_ANY_TAGGED);
 305
 306   // Emits optimized code for typeof x == "y".  Modifies input register.
 307   // Returns the condition on which a final split to
 308   // true and false label should be made, to optimize fallthrough.
 309   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
 310
 311   // Emits optimized code for %_IsObject(x).  Preserves input register.
 312   // Returns the condition on which a final split to
 313   // true and false label should be made, to optimize fallthrough.
 314   Condition EmitIsObject(Register input,
 315                          Register temp1,
 316                          Label* is_not_object,
 317                          Label* is_object);
 318
 319   // Emits optimized code for %_IsString(x).  Preserves input register.
 320   // Returns the condition on which a final split to
 321   // true and false label should be made, to optimize fallthrough.
 322   Condition EmitIsString(Register input,
 323                          Register temp1,
 324                          Label* is_not_string,
 325                          SmiCheck check_needed);
 326
 327   // Emits optimized code for %_IsConstructCall().
 328   // Caller should branch on equal condition.
 329   void EmitIsConstructCall(Register temp);
 330
 331   // Emits optimized code to deep-copy the contents of statically known
 332   // object graphs (e.g. object literal boilerplate).
 333   void EmitDeepCopy(Handle<JSObject> object,
 334                     Register result,
 335                     Register source,
 336                     int* offset,
 337                     AllocationSiteMode mode);
 338
 339   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 340   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 341   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 342   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 343   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 344   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 345   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 346
 347   template <class T>
 348   void EmitVectorLoadICRegisters(T* instr);
 349
 350   void EmitReturn(LReturn* instr, bool dynamic_frame_alignment);
 351
 352   // Emits code for pushing either a tagged constant, a (non-double)
 353   // register, or a stack slot operand.
 354   void EmitPushTaggedOperand(LOperand* operand);
 355
 356   void X87Fld(Operand src, X87OperandType opts);
 357
 358   void EmitFlushX87ForDeopt();
 359   void FlushX87StackIfNecessary(LInstruction* instr) {
 360     x87_stack_.FlushIfNecessary(instr, this);
 361   }
 362   friend class LGapResolver;
 363
 364 #ifdef _MSC_VER
 365   // On windows, you may not access the stack more than one page below
 366   // the most recently mapped page. To make the allocated area randomly
 367   // accessible, we write an arbitrary value to each page in range
 368   // esp + offset - page_size .. esp in turn.
 369   void MakeSureStackPagesMapped(int offset);
 370 #endif
 371
 372   ZoneList<LEnvironment*> deoptimizations_;
 373   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 374   ZoneList<Handle<Object> > deoptimization_literals_;
 375   int inlined_function_count_;
 376   Scope* const scope_;
 377   TranslationBuffer translations_;
 378   ZoneList<LDeferredCode*> deferred_;
 379   bool dynamic_frame_alignment_;
 380   bool support_aligned_spilled_doubles_;
 381   int osr_pc_offset_;
 382   bool frame_is_built_;
 383
 384   class X87Stack {
 385    public:
 386     explicit X87Stack(MacroAssembler* masm)
 387         : stack_depth_(0), is_mutable_(true), masm_(masm) { }
 388     explicit X87Stack(const X87Stack& other)
 389         : stack_depth_(other.stack_depth_), is_mutable_(false), masm_(masm()) {
 390       for (int i = 0; i < stack_depth_; i++) {
 391         stack_[i] = other.stack_[i];
 392       }
 393     }
 394     bool operator==(const X87Stack& other) const {
 395       if (stack_depth_ != other.stack_depth_) return false;
 396       for (int i = 0; i < stack_depth_; i++) {
 397         if (!stack_[i].is(other.stack_[i])) return false;
 398       }
 399       return true;
 400     }
 401     bool Contains(X87Register reg);
 402     void Fxch(X87Register reg, int other_slot = 0);
 403     void Free(X87Register reg);
 404     void PrepareToWrite(X87Register reg);
 405     void CommitWrite(X87Register reg);
 406     void FlushIfNecessary(LInstruction* instr, LCodeGen* cgen);
 407     void LeavingBlock(int current_block_id, LGoto* goto_instr);
 408     int depth() const { return stack_depth_; }
 409     void pop() {
 410       DCHECK(is_mutable_);
 411       stack_depth_--;
 412     }
 413     void push(X87Register reg) {
 414       DCHECK(is_mutable_);
 415       DCHECK(stack_depth_ < X87Register::kMaxNumAllocatableRegisters);
 416       stack_[stack_depth_] = reg;
 417       stack_depth_++;
 418     }
 419
 420     MacroAssembler* masm() const { return masm_; }
 421     Isolate* isolate() const { return masm_->isolate(); }
 422
 423    private:
 424     int ArrayIndex(X87Register reg);
 425     int st2idx(int pos);
 426
 427     X87Register stack_[X87Register::kMaxNumAllocatableRegisters];
 428     int stack_depth_;
 429     bool is_mutable_;
 430     MacroAssembler* masm_;
 431   };
 432   X87Stack x87_stack_;
 433
 434   // Builder that keeps track of safepoints in the code. The table
 435   // itself is emitted at the end of the generated code.
 436   SafepointTableBuilder safepoints_;
 437
 438   // Compiler from a set of parallel moves to a sequential list of moves.
 439   LGapResolver resolver_;
 440
 441   Safepoint::Kind expected_safepoint_kind_;
 442
 443   class PushSafepointRegistersScope V8_FINAL  BASE_EMBEDDED {
 444    public:
 445     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 446         : codegen_(codegen) {
 447       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 448       codegen_->masm_->PushSafepointRegisters();
 449       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 450       DCHECK(codegen_->info()->is_calling());
 451     }
 452
 453     ~PushSafepointRegistersScope() {
 454       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 455       codegen_->masm_->PopSafepointRegisters();
 456       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 457     }
 458
 459    private:
 460     LCodeGen* codegen_;
 461   };
 462
 463   friend class LDeferredCode;
 464   friend class LEnvironment;
 465   friend class SafepointGenerator;
 466   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 467 };
 468
 469
 470 class LDeferredCode : public ZoneObject {
 471  public:
 472   explicit LDeferredCode(LCodeGen* codegen, const LCodeGen::X87Stack& x87_stack)
 473       : codegen_(codegen),
 474         external_exit_(NULL),
 475         instruction_index_(codegen->current_instruction_),
 476         x87_stack_(x87_stack) {
 477     codegen->AddDeferredCode(this);
 478   }
 479
 480   virtual ~LDeferredCode() {}
 481   virtual void Generate() = 0;
 482   virtual LInstruction* instr() = 0;
 483
 484   void SetExit(Label* exit) { external_exit_ = exit; }
 485   Label* entry() { return &entry_; }
 486   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 487   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
 488   int instruction_index() const { return instruction_index_; }
 489   const LCodeGen::X87Stack& x87_stack() const { return x87_stack_; }
 490
 491  protected:
 492   LCodeGen* codegen() const { return codegen_; }
 493   MacroAssembler* masm() const { return codegen_->masm(); }
 494
 495  private:
 496   LCodeGen* codegen_;
 497   Label entry_;
 498   Label exit_;
 499   Label* external_exit_;
 500   Label done_;
 501   int instruction_index_;
 502   LCodeGen::X87Stack x87_stack_;
 503 };
 504
 505 } }  // namespace v8::internal
 506
 507 #endif  // V8_X87_LITHIUM_CODEGEN_X87_H_