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, Label* bool_load);
 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
 275   void RecordAndWritePosition(int position) V8_OVERRIDE;
 276
 277   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 278   void EmitGoto(int block);
 279
 280   // EmitBranch expects to be the last instruction of a block.
 281   template<class InstrType>
 282   void EmitBranch(InstrType instr, Condition condition);
 283   template<class InstrType>
 284   void EmitFalseBranch(InstrType instr, Condition condition);
 285   void EmitNumberUntagD(Register input,
 286                         DwVfpRegister result,
 287                         bool allow_undefined_as_nan,
 288                         bool deoptimize_on_minus_zero,
 289                         LEnvironment* env,
 290                         NumberUntagDMode mode);
 291
 292   // Emits optimized code for typeof x == "y".  Modifies input register.
 293   // Returns the condition on which a final split to
 294   // true and false label should be made, to optimize fallthrough.
 295   Condition EmitTypeofIs(Label* true_label,
 296                          Label* false_label,
 297                          Register input,
 298                          Handle<String> type_name);
 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 temp1, Register temp2);
 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) V8_OVERRIDE;
 329   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 330   template<class T>
 331   void DoLoadKeyedSIMD128ExternalArray(LLoadKeyed* instr);
 332   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 333   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 334   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 335   template<class T>
 336   void DoStoreKeyedSIMD128ExternalArray(LStoreKeyed* instr);
 337   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 338   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 339
 340   ZoneList<LEnvironment*> deoptimizations_;
 341   ZoneList<Deoptimizer::JumpTableEntry> deopt_jump_table_;
 342   ZoneList<Handle<Object> > deoptimization_literals_;
 343   int inlined_function_count_;
 344   Scope* const scope_;
 345   TranslationBuffer translations_;
 346   ZoneList<LDeferredCode*> deferred_;
 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       DCHECK(codegen_->info()->is_calling());
 364       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 365       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 366       codegen_->masm_->PushSafepointRegisters();
 367     }
 368
 369     ~PushSafepointRegistersScope() {
 370       DCHECK(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   int instruction_index() const { return instruction_index_; }
 403
 404  protected:
 405   LCodeGen* codegen() const { return codegen_; }
 406   MacroAssembler* masm() const { return codegen_->masm(); }
 407
 408  private:
 409   LCodeGen* codegen_;
 410   Label entry_;
 411   Label exit_;
 412   Label* external_exit_;
 413   int instruction_index_;
 414 };
 415
 416 } }  // namespace v8::internal
 417
 418 #endif  // V8_ARM_LITHIUM_CODEGEN_ARM_H_