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 <map>
   9 #include "src/x87/lithium-x87.h"
  10
  11 #include "src/base/logging.h"
  12 #include "src/deoptimizer.h"
  13 #include "src/lithium-codegen.h"
  14 #include "src/safepoint-table.h"
  15 #include "src/scopes.h"
  16 #include "src/utils.h"
  17 #include "src/x87/lithium-gap-resolver-x87.h"
  18
  19 namespace v8 {
  20 namespace internal {
  21
  22 // Forward declarations.
  23 class LDeferredCode;
  24 class LGapNode;
  25 class SafepointGenerator;
  26
  27 class LCodeGen: public LCodeGenBase {
  28  public:
  29   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
  30       : LCodeGenBase(chunk, assembler, info),
  31         deoptimizations_(4, info->zone()),
  32         jump_table_(4, info->zone()),
  33         deoptimization_literals_(8, info->zone()),
  34         inlined_function_count_(0),
  35         scope_(info->scope()),
  36         translations_(info->zone()),
  37         deferred_(8, info->zone()),
  38         dynamic_frame_alignment_(false),
  39         support_aligned_spilled_doubles_(false),
  40         osr_pc_offset_(-1),
  41         frame_is_built_(false),
  42         x87_stack_(assembler),
  43         safepoints_(info->zone()),
  44         resolver_(this),
  45         expected_safepoint_kind_(Safepoint::kSimple) {
  46     PopulateDeoptimizationLiteralsWithInlinedFunctions();
  47   }
  48
  49   int LookupDestination(int block_id) const {
  50     return chunk()->LookupDestination(block_id);
  51   }
  52
  53   bool IsNextEmittedBlock(int block_id) const {
  54     return LookupDestination(block_id) == GetNextEmittedBlock();
  55   }
  56
  57   bool NeedsEagerFrame() const {
  58     return GetStackSlotCount() > 0 ||
  59         info()->is_non_deferred_calling() ||
  60         !info()->IsStub() ||
  61         info()->requires_frame();
  62   }
  63   bool NeedsDeferredFrame() const {
  64     return !NeedsEagerFrame() && info()->is_deferred_calling();
  65   }
  66
  67   // Support for converting LOperands to assembler types.
  68   Operand ToOperand(LOperand* op) const;
  69   Register ToRegister(LOperand* op) const;
  70   X87Register ToX87Register(LOperand* op) const;
  71
  72   bool IsInteger32(LConstantOperand* op) const;
  73   bool IsSmi(LConstantOperand* op) const;
  74   Immediate ToImmediate(LOperand* op, const Representation& r) const {
  75     return Immediate(ToRepresentation(LConstantOperand::cast(op), r));
  76   }
  77   double ToDouble(LConstantOperand* op) const;
  78
  79   // Support for non-sse2 (x87) floating point stack handling.
  80   // These functions maintain the mapping of physical stack registers to our
  81   // virtual registers between instructions.
  82   enum X87OperandType { kX87DoubleOperand, kX87FloatOperand, kX87IntOperand };
  83
  84   void X87Mov(X87Register reg, Operand src,
  85       X87OperandType operand = kX87DoubleOperand);
  86   void X87Mov(Operand src, X87Register reg,
  87       X87OperandType operand = kX87DoubleOperand);
  88   void X87Mov(X87Register reg, X87Register src,
  89               X87OperandType operand = kX87DoubleOperand);
  90
  91   void X87PrepareBinaryOp(
  92       X87Register left, X87Register right, X87Register result);
  93
  94   void X87LoadForUsage(X87Register reg);
  95   void X87LoadForUsage(X87Register reg1, X87Register reg2);
  96   void X87PrepareToWrite(X87Register reg) { x87_stack_.PrepareToWrite(reg); }
  97   void X87CommitWrite(X87Register reg) { x87_stack_.CommitWrite(reg); }
  98
  99   void X87Fxch(X87Register reg, int other_slot = 0) {
 100     x87_stack_.Fxch(reg, other_slot);
 101   }
 102   void X87Free(X87Register reg) {
 103     x87_stack_.Free(reg);
 104   }
 105
 106
 107   bool X87StackEmpty() {
 108     return x87_stack_.depth() == 0;
 109   }
 110
 111   Handle<Object> ToHandle(LConstantOperand* op) const;
 112
 113   // The operand denoting the second word (the one with a higher address) of
 114   // a double stack slot.
 115   Operand HighOperand(LOperand* op);
 116
 117   // Try to generate code for the entire chunk, but it may fail if the
 118   // chunk contains constructs we cannot handle. Returns true if the
 119   // code generation attempt succeeded.
 120   bool GenerateCode();
 121
 122   // Finish the code by setting stack height, safepoint, and bailout
 123   // information on it.
 124   void FinishCode(Handle<Code> code);
 125
 126   // Deferred code support.
 127   void DoDeferredNumberTagD(LNumberTagD* instr);
 128
 129   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
 130   void DoDeferredNumberTagIU(LInstruction* instr,
 131                              LOperand* value,
 132                              LOperand* temp,
 133                              IntegerSignedness signedness);
 134
 135   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
 136   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
 137   void DoDeferredStackCheck(LStackCheck* instr);
 138   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 139   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 140   void DoDeferredAllocate(LAllocate* instr);
 141   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 142                                        Label* map_check);
 143   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 144   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 145                                    Register object,
 146                                    Register index);
 147
 148   // Parallel move support.
 149   void DoParallelMove(LParallelMove* move);
 150   void DoGap(LGap* instr);
 151
 152   // Emit frame translation commands for an environment.
 153   void WriteTranslation(LEnvironment* environment, Translation* translation);
 154
 155   void EnsureRelocSpaceForDeoptimization();
 156
 157   // Declare methods that deal with the individual node types.
 158 #define DECLARE_DO(type) void Do##type(L##type* node);
 159   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 160 #undef DECLARE_DO
 161
 162  private:
 163   StrictMode strict_mode() const { return info()->strict_mode(); }
 164
 165   Scope* scope() const { return scope_; }
 166
 167   void EmitClassOfTest(Label* if_true,
 168                        Label* if_false,
 169                        Handle<String> class_name,
 170                        Register input,
 171                        Register temporary,
 172                        Register temporary2);
 173
 174   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 175
 176   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 177
 178   // Code generation passes.  Returns true if code generation should
 179   // continue.
 180   void GenerateBodyInstructionPre(LInstruction* instr) OVERRIDE;
 181   void GenerateBodyInstructionPost(LInstruction* instr) OVERRIDE;
 182   bool GeneratePrologue();
 183   bool GenerateDeferredCode();
 184   bool GenerateJumpTable();
 185   bool GenerateSafepointTable();
 186
 187   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 188   void GenerateOsrPrologue();
 189
 190   enum SafepointMode {
 191     RECORD_SIMPLE_SAFEPOINT,
 192     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 193   };
 194
 195   void CallCode(Handle<Code> code,
 196                 RelocInfo::Mode mode,
 197                 LInstruction* instr);
 198
 199   void CallCodeGeneric(Handle<Code> code,
 200                        RelocInfo::Mode mode,
 201                        LInstruction* instr,
 202                        SafepointMode safepoint_mode);
 203
 204   void CallRuntime(const Runtime::Function* fun, int argc, LInstruction* instr,
 205                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 206
 207   void CallRuntime(Runtime::FunctionId id,
 208                    int argc,
 209                    LInstruction* instr) {
 210     const Runtime::Function* function = Runtime::FunctionForId(id);
 211     CallRuntime(function, argc, instr);
 212   }
 213
 214   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 215                                int argc,
 216                                LInstruction* instr,
 217                                LOperand* context);
 218
 219   void LoadContextFromDeferred(LOperand* context);
 220
 221   // Generate a direct call to a known function.  Expects the function
 222   // to be in edi.
 223   void CallKnownFunction(Handle<JSFunction> function,
 224                          int formal_parameter_count, int arity,
 225                          LInstruction* instr);
 226
 227   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 228                                     SafepointMode safepoint_mode);
 229
 230   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 231                                             Safepoint::DeoptMode mode);
 232   void DeoptimizeIf(Condition cc, LInstruction* instr, const char* detail,
 233                     Deoptimizer::BailoutType bailout_type);
 234   void DeoptimizeIf(Condition cc, LInstruction* instr, const char* detail);
 235
 236   bool DeoptEveryNTimes() {
 237     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
 238   }
 239
 240   void AddToTranslation(LEnvironment* environment,
 241                         Translation* translation,
 242                         LOperand* op,
 243                         bool is_tagged,
 244                         bool is_uint32,
 245                         int* object_index_pointer,
 246                         int* dematerialized_index_pointer);
 247   void PopulateDeoptimizationData(Handle<Code> code);
 248   int DefineDeoptimizationLiteral(Handle<Object> literal);
 249
 250   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 251
 252   Register ToRegister(int index) const;
 253   X87Register ToX87Register(int index) const;
 254   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
 255   int32_t ToInteger32(LConstantOperand* op) const;
 256   ExternalReference ToExternalReference(LConstantOperand* op) const;
 257
 258   Operand BuildFastArrayOperand(LOperand* elements_pointer,
 259                                 LOperand* key,
 260                                 Representation key_representation,
 261                                 ElementsKind elements_kind,
 262                                 uint32_t base_offset);
 263
 264   Operand BuildSeqStringOperand(Register string,
 265                                 LOperand* index,
 266                                 String::Encoding encoding);
 267
 268   void EmitIntegerMathAbs(LMathAbs* instr);
 269
 270   // Support for recording safepoint and position information.
 271   void RecordSafepoint(LPointerMap* pointers,
 272                        Safepoint::Kind kind,
 273                        int arguments,
 274                        Safepoint::DeoptMode mode);
 275   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 276   void RecordSafepoint(Safepoint::DeoptMode mode);
 277   void RecordSafepointWithRegisters(LPointerMap* pointers,
 278                                     int arguments,
 279                                     Safepoint::DeoptMode mode);
 280
 281   void RecordAndWritePosition(int position) OVERRIDE;
 282
 283   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 284   void EmitGoto(int block);
 285
 286   // EmitBranch expects to be the last instruction of a block.
 287   template<class InstrType>
 288   void EmitBranch(InstrType instr, Condition cc);
 289   template<class InstrType>
 290   void EmitFalseBranch(InstrType instr, Condition cc);
 291   void EmitNumberUntagDNoSSE2(LNumberUntagD* instr, Register input,
 292                               Register temp, X87Register res_reg,
 293                               NumberUntagDMode mode);
 294
 295   // Emits optimized code for typeof x == "y".  Modifies input register.
 296   // Returns the condition on which a final split to
 297   // true and false label should be made, to optimize fallthrough.
 298   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
 299
 300   // Emits optimized code for %_IsObject(x).  Preserves input register.
 301   // Returns the condition on which a final split to
 302   // true and false label should be made, to optimize fallthrough.
 303   Condition EmitIsObject(Register input,
 304                          Register temp1,
 305                          Label* is_not_object,
 306                          Label* is_object);
 307
 308   // Emits optimized code for %_IsString(x).  Preserves input register.
 309   // Returns the condition on which a final split to
 310   // true and false label should be made, to optimize fallthrough.
 311   Condition EmitIsString(Register input,
 312                          Register temp1,
 313                          Label* is_not_string,
 314                          SmiCheck check_needed);
 315
 316   // Emits optimized code for %_IsConstructCall().
 317   // Caller should branch on equal condition.
 318   void EmitIsConstructCall(Register temp);
 319
 320   // Emits optimized code to deep-copy the contents of statically known
 321   // object graphs (e.g. object literal boilerplate).
 322   void EmitDeepCopy(Handle<JSObject> object,
 323                     Register result,
 324                     Register source,
 325                     int* offset,
 326                     AllocationSiteMode mode);
 327
 328   void EnsureSpaceForLazyDeopt(int space_needed) OVERRIDE;
 329   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 330   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 331   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 332   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 333   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 334   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 335
 336   template <class T>
 337   void EmitVectorLoadICRegisters(T* instr);
 338
 339   void EmitReturn(LReturn* instr, bool dynamic_frame_alignment);
 340
 341   // Emits code for pushing either a tagged constant, a (non-double)
 342   // register, or a stack slot operand.
 343   void EmitPushTaggedOperand(LOperand* operand);
 344
 345   void X87Fld(Operand src, X87OperandType opts);
 346
 347   void EmitFlushX87ForDeopt();
 348   void FlushX87StackIfNecessary(LInstruction* instr) {
 349     x87_stack_.FlushIfNecessary(instr, this);
 350   }
 351   friend class LGapResolver;
 352
 353 #ifdef _MSC_VER
 354   // On windows, you may not access the stack more than one page below
 355   // the most recently mapped page. To make the allocated area randomly
 356   // accessible, we write an arbitrary value to each page in range
 357   // esp + offset - page_size .. esp in turn.
 358   void MakeSureStackPagesMapped(int offset);
 359 #endif
 360
 361   ZoneList<LEnvironment*> deoptimizations_;
 362   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
 363   ZoneList<Handle<Object> > deoptimization_literals_;
 364   int inlined_function_count_;
 365   Scope* const scope_;
 366   TranslationBuffer translations_;
 367   ZoneList<LDeferredCode*> deferred_;
 368   bool dynamic_frame_alignment_;
 369   bool support_aligned_spilled_doubles_;
 370   int osr_pc_offset_;
 371   bool frame_is_built_;
 372
 373   class X87Stack : public ZoneObject {
 374    public:
 375     explicit X87Stack(MacroAssembler* masm)
 376         : stack_depth_(0), is_mutable_(true), masm_(masm) { }
 377     explicit X87Stack(const X87Stack& other)
 378         : stack_depth_(other.stack_depth_), is_mutable_(false), masm_(masm()) {
 379       for (int i = 0; i < stack_depth_; i++) {
 380         stack_[i] = other.stack_[i];
 381       }
 382     }
 383     bool operator==(const X87Stack& other) const {
 384       if (stack_depth_ != other.stack_depth_) return false;
 385       for (int i = 0; i < stack_depth_; i++) {
 386         if (!stack_[i].is(other.stack_[i])) return false;
 387       }
 388       return true;
 389     }
 390     X87Stack& operator=(const X87Stack& other) {
 391       stack_depth_ = other.stack_depth_;
 392       for (int i = 0; i < stack_depth_; i++) {
 393         stack_[i] = other.stack_[i];
 394       }
 395       return *this;
 396     }
 397     bool Contains(X87Register reg);
 398     void Fxch(X87Register reg, int other_slot = 0);
 399     void Free(X87Register reg);
 400     void PrepareToWrite(X87Register reg);
 401     void CommitWrite(X87Register reg);
 402     void FlushIfNecessary(LInstruction* instr, LCodeGen* cgen);
 403     void LeavingBlock(int current_block_id, LGoto* goto_instr, LCodeGen* cgen);
 404     int depth() const { return stack_depth_; }
 405     int GetLayout();
 406     int st(X87Register reg) { return st2idx(ArrayIndex(reg)); }
 407     void pop() {
 408       DCHECK(is_mutable_);
 409       stack_depth_--;
 410     }
 411     void push(X87Register reg) {
 412       DCHECK(is_mutable_);
 413       DCHECK(stack_depth_ < X87Register::kMaxNumAllocatableRegisters);
 414       stack_[stack_depth_] = reg;
 415       stack_depth_++;
 416     }
 417
 418     MacroAssembler* masm() const { return masm_; }
 419     Isolate* isolate() const { return masm_->isolate(); }
 420
 421    private:
 422     int ArrayIndex(X87Register reg);
 423     int st2idx(int pos);
 424
 425     X87Register stack_[X87Register::kMaxNumAllocatableRegisters];
 426     int stack_depth_;
 427     bool is_mutable_;
 428     MacroAssembler* masm_;
 429   };
 430   X87Stack x87_stack_;
 431   // block_id -> X87Stack*;
 432   typedef std::map<int, X87Stack*> X87StackMap;
 433   X87StackMap x87_stack_map_;
 434
 435   // Builder that keeps track of safepoints in the code. The table
 436   // itself is emitted at the end of the generated code.
 437   SafepointTableBuilder safepoints_;
 438
 439   // Compiler from a set of parallel moves to a sequential list of moves.
 440   LGapResolver resolver_;
 441
 442   Safepoint::Kind expected_safepoint_kind_;
 443
 444   class PushSafepointRegistersScope FINAL  BASE_EMBEDDED {
 445    public:
 446     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 447         : codegen_(codegen) {
 448       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 449       codegen_->masm_->PushSafepointRegisters();
 450       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 451       DCHECK(codegen_->info()->is_calling());
 452     }
 453
 454     ~PushSafepointRegistersScope() {
 455       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 456       codegen_->masm_->PopSafepointRegisters();
 457       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 458     }
 459
 460    private:
 461     LCodeGen* codegen_;
 462   };
 463
 464   friend class LDeferredCode;
 465   friend class LEnvironment;
 466   friend class SafepointGenerator;
 467   friend class X87Stack;
 468   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 469 };
 470
 471
 472 class LDeferredCode : public ZoneObject {
 473  public:
 474   explicit LDeferredCode(LCodeGen* codegen, const LCodeGen::X87Stack& x87_stack)
 475       : codegen_(codegen),
 476         external_exit_(NULL),
 477         instruction_index_(codegen->current_instruction_),
 478         x87_stack_(x87_stack) {
 479     codegen->AddDeferredCode(this);
 480   }
 481
 482   virtual ~LDeferredCode() {}
 483   virtual void Generate() = 0;
 484   virtual LInstruction* instr() = 0;
 485
 486   void SetExit(Label* exit) { external_exit_ = exit; }
 487   Label* entry() { return &entry_; }
 488   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 489   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
 490   int instruction_index() const { return instruction_index_; }
 491   const LCodeGen::X87Stack& x87_stack() const { return x87_stack_; }
 492
 493  protected:
 494   LCodeGen* codegen() const { return codegen_; }
 495   MacroAssembler* masm() const { return codegen_->masm(); }
 496
 497  private:
 498   LCodeGen* codegen_;
 499   Label entry_;
 500   Label exit_;
 501   Label* external_exit_;
 502   Label done_;
 503   int instruction_index_;
 504   LCodeGen::X87Stack x87_stack_;
 505 };
 506
 507 } }  // namespace v8::internal
 508
 509 #endif  // V8_X87_LITHIUM_CODEGEN_X87_H_