src/v8/src/arm/lithium-codegen-arm.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_ARM_LITHIUM_CODEGEN_ARM_H_
   6 #define V8_ARM_LITHIUM_CODEGEN_ARM_H_
   7
   8 #include "src/arm/lithium-arm.h"
   9
  10 #include "src/arm/lithium-gap-resolver-arm.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
  17 namespace v8 {
  18 namespace internal {
  19
  20 // Forward declarations.
  21 class LDeferredCode;
  22 class SafepointGenerator;
  23
  24 class LCodeGen: public LCodeGenBase {
  25  public:
  26   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
  27       : LCodeGenBase(chunk, assembler, info),
  28         deoptimizations_(4, info->zone()),
  29         deopt_jump_table_(4, info->zone()),
  30         deoptimization_literals_(8, info->zone()),
  31         inlined_function_count_(0),
  32         scope_(info->scope()),
  33         translations_(info->zone()),
  34         deferred_(8, info->zone()),
  35         osr_pc_offset_(-1),
  36         frame_is_built_(false),
  37         safepoints_(info->zone()),
  38         resolver_(this),
  39         expected_safepoint_kind_(Safepoint::kSimple) {
  40     PopulateDeoptimizationLiteralsWithInlinedFunctions();
  41   }
  42
  43
  44   int LookupDestination(int block_id) const {
  45     return chunk()->LookupDestination(block_id);
  46   }
  47
  48   bool IsNextEmittedBlock(int block_id) const {
  49     return LookupDestination(block_id) == GetNextEmittedBlock();
  50   }
  51
  52   bool NeedsEagerFrame() const {
  53     return GetStackSlotCount() > 0 ||
  54         info()->is_non_deferred_calling() ||
  55         !info()->IsStub() ||
  56         info()->requires_frame();
  57   }
  58   bool NeedsDeferredFrame() const {
  59     return !NeedsEagerFrame() && info()->is_deferred_calling();
  60   }
  61
  62   LinkRegisterStatus GetLinkRegisterState() const {
  63     return frame_is_built_ ? kLRHasBeenSaved : kLRHasNotBeenSaved;
  64   }
  65
  66   // Support for converting LOperands to assembler types.
  67   // LOperand must be a register.
  68   Register ToRegister(LOperand* op) const;
  69
  70   // LOperand is loaded into scratch, unless already a register.
  71   Register EmitLoadRegister(LOperand* op, Register scratch);
  72
  73   // LOperand must be a double register.
  74   DwVfpRegister ToDoubleRegister(LOperand* op) const;
  75
  76   // LOperand is loaded into dbl_scratch, unless already a double register.
  77   DwVfpRegister EmitLoadDoubleRegister(LOperand* op,
  78                                        SwVfpRegister flt_scratch,
  79                                        DwVfpRegister dbl_scratch);
  80   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
  81   int32_t ToInteger32(LConstantOperand* op) const;
  82   Smi* ToSmi(LConstantOperand* op) const;
  83   double ToDouble(LConstantOperand* op) const;
  84   Operand ToOperand(LOperand* op);
  85   MemOperand ToMemOperand(LOperand* op) const;
  86   // Returns a MemOperand pointing to the high word of a DoubleStackSlot.
  87   MemOperand ToHighMemOperand(LOperand* op) const;
  88
  89   bool IsInteger32(LConstantOperand* op) const;
  90   bool IsSmi(LConstantOperand* op) const;
  91   Handle<Object> ToHandle(LConstantOperand* op) const;
  92
  93   // Try to generate code for the entire chunk, but it may fail if the
  94   // chunk contains constructs we cannot handle. Returns true if the
  95   // code generation attempt succeeded.
  96   bool GenerateCode();
  97
  98   // Finish the code by setting stack height, safepoint, and bailout
  99   // information on it.
 100   void FinishCode(Handle<Code> code);
 101
 102   // Deferred code support.
 103   void DoDeferredNumberTagD(LNumberTagD* instr);
 104
 105   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
 106   void DoDeferredNumberTagIU(LInstruction* instr,
 107                              LOperand* value,
 108                              LOperand* temp1,
 109                              LOperand* temp2,
 110                              IntegerSignedness signedness);
 111
 112   void DoDeferredTaggedToI(LTaggedToI* instr);
 113   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
 114   void DoDeferredStackCheck(LStackCheck* instr);
 115   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 116   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 117   void DoDeferredAllocate(LAllocate* instr);
 118   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 119                                        Label* map_check);
 120   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 121   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 122                                    Register result,
 123                                    Register object,
 124                                    Register index);
 125   void DoDeferredSIMD128ToTagged(LInstruction* instr, Runtime::FunctionId id);
 126
 127   // Parallel move support.
 128   void DoParallelMove(LParallelMove* move);
 129   void DoGap(LGap* instr);
 130
 131   MemOperand PrepareKeyedOperand(Register key,
 132                                  Register base,
 133                                  bool key_is_constant,
 134                                  int constant_key,
 135                                  int element_size,
 136                                  int shift_size,
 137                                  int base_offset);
 138
 139   // Emit frame translation commands for an environment.
 140   void WriteTranslation(LEnvironment* environment, Translation* translation);
 141
 142   // Declare methods that deal with the individual node types.
 143 #define DECLARE_DO(type) void Do##type(L##type* node);
 144   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 145 #undef DECLARE_DO
 146
 147  private:
 148   StrictMode strict_mode() const { return info()->strict_mode(); }
 149
 150   Scope* scope() const { return scope_; }
 151
 152   Register scratch0() { return r9; }
 153   LowDwVfpRegister double_scratch0() { return kScratchDoubleReg; }
 154
 155   LInstruction* GetNextInstruction();
 156
 157   void EmitClassOfTest(Label* if_true,
 158                        Label* if_false,
 159                        Handle<String> class_name,
 160                        Register input,
 161                        Register temporary,
 162                        Register temporary2);
 163
 164   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 165
 166   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 167
 168   void SaveCallerDoubles();
 169   void RestoreCallerDoubles();
 170
 171   // Code generation passes.  Returns true if code generation should
 172   // continue.
 173   void GenerateBodyInstructionPre(LInstruction* instr) V8_OVERRIDE;
 174   bool GeneratePrologue();
 175   bool GenerateDeferredCode();
 176   bool GenerateDeoptJumpTable();
 177   bool GenerateSafepointTable();
 178
 179   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 180   void GenerateOsrPrologue();
 181
 182   enum SafepointMode {
 183     RECORD_SIMPLE_SAFEPOINT,
 184     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 185   };
 186
 187   int CallCodeSize(Handle<Code> code, RelocInfo::Mode mode);
 188
 189   void CallCode(
 190       Handle<Code> code,
 191       RelocInfo::Mode mode,
 192       LInstruction* instr,
 193       TargetAddressStorageMode storage_mode = CAN_INLINE_TARGET_ADDRESS);
 194
 195   void CallCodeGeneric(
 196       Handle<Code> code,
 197       RelocInfo::Mode mode,
 198       LInstruction* instr,
 199       SafepointMode safepoint_mode,
 200       TargetAddressStorageMode storage_mode = CAN_INLINE_TARGET_ADDRESS);
 201
 202   void CallRuntime(const Runtime::Function* function,
 203                    int num_arguments,
 204                    LInstruction* instr,
 205                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 206
 207   void CallRuntime(Runtime::FunctionId id,
 208                    int num_arguments,
 209                    LInstruction* instr) {
 210     const Runtime::Function* function = Runtime::FunctionForId(id);
 211     CallRuntime(function, num_arguments, instr);
 212   }
 213
 214   void LoadContextFromDeferred(LOperand* context);
 215   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 216                                int argc,
 217                                LInstruction* instr,
 218                                LOperand* context);
 219
 220   enum R1State {
 221     R1_UNINITIALIZED,
 222     R1_CONTAINS_TARGET
 223   };
 224
 225   // Generate a direct call to a known function.  Expects the function
 226   // to be in r1.
 227   void CallKnownFunction(Handle<JSFunction> function,
 228                          int formal_parameter_count,
 229                          int arity,
 230                          LInstruction* instr,
 231                          R1State r1_state);
 232
 233   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 234                                     SafepointMode safepoint_mode);
 235
 236   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 237                                             Safepoint::DeoptMode mode);
 238   void DeoptimizeIf(Condition condition,
 239                     LEnvironment* environment,
 240                     Deoptimizer::BailoutType bailout_type);
 241   void DeoptimizeIf(Condition condition, LEnvironment* environment);
 242
 243   void AddToTranslation(LEnvironment* environment,
 244                         Translation* translation,
 245                         LOperand* op,
 246                         bool is_tagged,
 247                         bool is_uint32,
 248                         int* object_index_pointer,
 249                         int* dematerialized_index_pointer);
 250   void PopulateDeoptimizationData(Handle<Code> code);
 251   int DefineDeoptimizationLiteral(Handle<Object> literal);
 252
 253   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 254
 255   Register ToRegister(int index) const;
 256   DwVfpRegister ToDoubleRegister(int index) const;
 257
 258   MemOperand BuildSeqStringOperand(Register string,
 259                                    LOperand* index,
 260                                    String::Encoding encoding);
 261
 262   void EmitIntegerMathAbs(LMathAbs* instr);
 263
 264   // Support for recording safepoint and position information.
 265   void RecordSafepoint(LPointerMap* pointers,
 266                        Safepoint::Kind kind,
 267                        int arguments,
 268                        Safepoint::DeoptMode mode);
 269   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 270   void RecordSafepoint(Safepoint::DeoptMode mode);
 271   void RecordSafepointWithRegisters(LPointerMap* pointers,
 272                                     int arguments,
 273                                     Safepoint::DeoptMode mode);
 274   void RecordSafepointWithRegistersAndDoubles(LPointerMap* pointers,
 275                                               int arguments,
 276                                               Safepoint::DeoptMode mode);
 277
 278   void RecordAndWritePosition(int position) V8_OVERRIDE;
 279
 280   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 281   void EmitGoto(int block);
 282
 283   // EmitBranch expects to be the last instruction of a block.
 284   template<class InstrType>
 285   void EmitBranch(InstrType instr, Condition condition);
 286   template<class InstrType>
 287   void EmitFalseBranch(InstrType instr, Condition condition);
 288   void EmitNumberUntagD(Register input,
 289                         DwVfpRegister result,
 290                         bool allow_undefined_as_nan,
 291                         bool deoptimize_on_minus_zero,
 292                         LEnvironment* env,
 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(Label* true_label,
 299                          Label* false_label,
 300                          Register input,
 301                          Handle<String> type_name);
 302
 303   // Emits optimized code for %_IsObject(x).  Preserves input register.
 304   // Returns the condition on which a final split to
 305   // true and false label should be made, to optimize fallthrough.
 306   Condition EmitIsObject(Register input,
 307                          Register temp1,
 308                          Label* is_not_object,
 309                          Label* is_object);
 310
 311   // Emits optimized code for %_IsString(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 EmitIsString(Register input,
 315                          Register temp1,
 316                          Label* is_not_string,
 317                          SmiCheck check_needed);
 318
 319   // Emits optimized code for %_IsConstructCall().
 320   // Caller should branch on equal condition.
 321   void EmitIsConstructCall(Register temp1, Register temp2);
 322
 323   // Emits optimized code to deep-copy the contents of statically known
 324   // object graphs (e.g. object literal boilerplate).
 325   void EmitDeepCopy(Handle<JSObject> object,
 326                     Register result,
 327                     Register source,
 328                     int* offset,
 329                     AllocationSiteMode mode);
 330
 331   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 332   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 333   template<class T>
 334   void DoLoadKeyedSIMD128ExternalArray(LLoadKeyed* instr);
 335   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 336   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 337   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 338   template<class T>
 339   void DoStoreKeyedSIMD128ExternalArray(LStoreKeyed* instr);
 340   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 341   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 342
 343   ZoneList<LEnvironment*> deoptimizations_;
 344   ZoneList<Deoptimizer::JumpTableEntry> deopt_jump_table_;
 345   ZoneList<Handle<Object> > deoptimization_literals_;
 346   int inlined_function_count_;
 347   Scope* const scope_;
 348   TranslationBuffer translations_;
 349   ZoneList<LDeferredCode*> deferred_;
 350   int osr_pc_offset_;
 351   bool frame_is_built_;
 352
 353   // Builder that keeps track of safepoints in the code. The table
 354   // itself is emitted at the end of the generated code.
 355   SafepointTableBuilder safepoints_;
 356
 357   // Compiler from a set of parallel moves to a sequential list of moves.
 358   LGapResolver resolver_;
 359
 360   Safepoint::Kind expected_safepoint_kind_;
 361
 362   class PushSafepointRegistersScope V8_FINAL BASE_EMBEDDED {
 363    public:
 364     PushSafepointRegistersScope(LCodeGen* codegen,
 365                                 Safepoint::Kind kind)
 366         : codegen_(codegen) {
 367       ASSERT(codegen_->info()->is_calling());
 368       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 369       codegen_->expected_safepoint_kind_ = kind;
 370
 371       switch (codegen_->expected_safepoint_kind_) {
 372         case Safepoint::kWithRegisters:
 373           codegen_->masm_->PushSafepointRegisters();
 374           break;
 375         case Safepoint::kWithRegistersAndDoubles:
 376           codegen_->masm_->PushSafepointRegistersAndDoubles();
 377           break;
 378         default:
 379           UNREACHABLE();
 380       }
 381     }
 382
 383     ~PushSafepointRegistersScope() {
 384       Safepoint::Kind kind = codegen_->expected_safepoint_kind_;
 385       ASSERT((kind & Safepoint::kWithRegisters) != 0);
 386       switch (kind) {
 387         case Safepoint::kWithRegisters:
 388           codegen_->masm_->PopSafepointRegisters();
 389           break;
 390         case Safepoint::kWithRegistersAndDoubles:
 391           codegen_->masm_->PopSafepointRegistersAndDoubles();
 392           break;
 393         default:
 394           UNREACHABLE();
 395       }
 396       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 397     }
 398
 399    private:
 400     LCodeGen* codegen_;
 401   };
 402
 403   friend class LDeferredCode;
 404   friend class LEnvironment;
 405   friend class SafepointGenerator;
 406   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 407 };
 408
 409
 410 class LDeferredCode : public ZoneObject {
 411  public:
 412   explicit LDeferredCode(LCodeGen* codegen)
 413       : codegen_(codegen),
 414         external_exit_(NULL),
 415         instruction_index_(codegen->current_instruction_) {
 416     codegen->AddDeferredCode(this);
 417   }
 418
 419   virtual ~LDeferredCode() {}
 420   virtual void Generate() = 0;
 421   virtual LInstruction* instr() = 0;
 422
 423   void SetExit(Label* exit) { external_exit_ = exit; }
 424   Label* entry() { return &entry_; }
 425   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 426   int instruction_index() const { return instruction_index_; }
 427
 428  protected:
 429   LCodeGen* codegen() const { return codegen_; }
 430   MacroAssembler* masm() const { return codegen_->masm(); }
 431
 432  private:
 433   LCodeGen* codegen_;
 434   Label entry_;
 435   Label exit_;
 436   Label* external_exit_;
 437   int instruction_index_;
 438 };
 439
 440 } }  // namespace v8::internal
 441
 442 #endif  // V8_ARM_LITHIUM_CODEGEN_ARM_H_