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 "arm/lithium-arm.h"
   9
  10 #include "arm/lithium-gap-resolver-arm.h"
  11 #include "deoptimizer.h"
  12 #include "lithium-codegen.h"
  13 #include "safepoint-table.h"
  14 #include "scopes.h"
  15 #include "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 additional_index,
 138                                  int additional_offset);
 139
 140   // Emit frame translation commands for an environment.
 141   void WriteTranslation(LEnvironment* environment, Translation* translation);
 142
 143   // Declare methods that deal with the individual node types.
 144 #define DECLARE_DO(type) void Do##type(L##type* node);
 145   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 146 #undef DECLARE_DO
 147
 148  private:
 149   StrictMode strict_mode() const { return info()->strict_mode(); }
 150
 151   Scope* scope() const { return scope_; }
 152
 153   Register scratch0() { return r9; }
 154   LowDwVfpRegister double_scratch0() { return kScratchDoubleReg; }
 155
 156   LInstruction* GetNextInstruction();
 157
 158   void EmitClassOfTest(Label* if_true,
 159                        Label* if_false,
 160                        Handle<String> class_name,
 161                        Register input,
 162                        Register temporary,
 163                        Register temporary2);
 164
 165   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 166
 167   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 168
 169   void SaveCallerDoubles();
 170   void RestoreCallerDoubles();
 171
 172   // Code generation passes.  Returns true if code generation should
 173   // continue.
 174   void GenerateBodyInstructionPre(LInstruction* instr) V8_OVERRIDE;
 175   bool GeneratePrologue();
 176   bool GenerateDeferredCode();
 177   bool GenerateDeoptJumpTable();
 178   bool GenerateSafepointTable();
 179
 180   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 181   void GenerateOsrPrologue();
 182
 183   enum SafepointMode {
 184     RECORD_SIMPLE_SAFEPOINT,
 185     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 186   };
 187
 188   int CallCodeSize(Handle<Code> code, RelocInfo::Mode mode);
 189
 190   void CallCode(
 191       Handle<Code> code,
 192       RelocInfo::Mode mode,
 193       LInstruction* instr,
 194       TargetAddressStorageMode storage_mode = CAN_INLINE_TARGET_ADDRESS);
 195
 196   void CallCodeGeneric(
 197       Handle<Code> code,
 198       RelocInfo::Mode mode,
 199       LInstruction* instr,
 200       SafepointMode safepoint_mode,
 201       TargetAddressStorageMode storage_mode = CAN_INLINE_TARGET_ADDRESS);
 202
 203   void CallRuntime(const Runtime::Function* function,
 204                    int num_arguments,
 205                    LInstruction* instr,
 206                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 207
 208   void CallRuntime(Runtime::FunctionId id,
 209                    int num_arguments,
 210                    LInstruction* instr) {
 211     const Runtime::Function* function = Runtime::FunctionForId(id);
 212     CallRuntime(function, num_arguments, instr);
 213   }
 214
 215   void LoadContextFromDeferred(LOperand* context);
 216   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 217                                int argc,
 218                                LInstruction* instr,
 219                                LOperand* context);
 220
 221   enum R1State {
 222     R1_UNINITIALIZED,
 223     R1_CONTAINS_TARGET
 224   };
 225
 226   // Generate a direct call to a known function.  Expects the function
 227   // to be in r1.
 228   void CallKnownFunction(Handle<JSFunction> function,
 229                          int formal_parameter_count,
 230                          int arity,
 231                          LInstruction* instr,
 232                          R1State r1_state);
 233
 234   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 235                                     SafepointMode safepoint_mode);
 236
 237   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 238                                             Safepoint::DeoptMode mode);
 239   void DeoptimizeIf(Condition condition,
 240                     LEnvironment* environment,
 241                     Deoptimizer::BailoutType bailout_type);
 242   void DeoptimizeIf(Condition condition, LEnvironment* environment);
 243
 244   void AddToTranslation(LEnvironment* environment,
 245                         Translation* translation,
 246                         LOperand* op,
 247                         bool is_tagged,
 248                         bool is_uint32,
 249                         int* object_index_pointer,
 250                         int* dematerialized_index_pointer);
 251   void PopulateDeoptimizationData(Handle<Code> code);
 252   int DefineDeoptimizationLiteral(Handle<Object> literal);
 253
 254   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 255
 256   Register ToRegister(int index) const;
 257   DwVfpRegister ToDoubleRegister(int index) const;
 258
 259   MemOperand BuildSeqStringOperand(Register string,
 260                                    LOperand* index,
 261                                    String::Encoding encoding);
 262
 263   void EmitIntegerMathAbs(LMathAbs* instr);
 264
 265   // Support for recording safepoint and position information.
 266   void RecordSafepoint(LPointerMap* pointers,
 267                        Safepoint::Kind kind,
 268                        int arguments,
 269                        Safepoint::DeoptMode mode);
 270   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 271   void RecordSafepoint(Safepoint::DeoptMode mode);
 272   void RecordSafepointWithRegisters(LPointerMap* pointers,
 273                                     int arguments,
 274                                     Safepoint::DeoptMode mode);
 275   void RecordSafepointWithRegistersAndDoubles(LPointerMap* pointers,
 276                                               int arguments,
 277                                               Safepoint::DeoptMode mode);
 278
 279   void RecordAndWritePosition(int position) V8_OVERRIDE;
 280
 281   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 282   void EmitGoto(int block);
 283
 284   // EmitBranch expects to be the last instruction of a block.
 285   template<class InstrType>
 286   void EmitBranch(InstrType instr, Condition condition);
 287   template<class InstrType>
 288   void EmitFalseBranch(InstrType instr, Condition condition);
 289   void EmitNumberUntagD(Register input,
 290                         DwVfpRegister result,
 291                         bool allow_undefined_as_nan,
 292                         bool deoptimize_on_minus_zero,
 293                         LEnvironment* env,
 294                         NumberUntagDMode mode);
 295
 296   // Emits optimized code for typeof x == "y".  Modifies input register.
 297   // Returns the condition on which a final split to
 298   // true and false label should be made, to optimize fallthrough.
 299   Condition EmitTypeofIs(Label* true_label,
 300                          Label* false_label,
 301                          Register input,
 302                          Handle<String> type_name);
 303
 304   // Emits optimized code for %_IsObject(x).  Preserves input register.
 305   // Returns the condition on which a final split to
 306   // true and false label should be made, to optimize fallthrough.
 307   Condition EmitIsObject(Register input,
 308                          Register temp1,
 309                          Label* is_not_object,
 310                          Label* is_object);
 311
 312   // Emits optimized code for %_IsString(x).  Preserves input register.
 313   // Returns the condition on which a final split to
 314   // true and false label should be made, to optimize fallthrough.
 315   Condition EmitIsString(Register input,
 316                          Register temp1,
 317                          Label* is_not_string,
 318                          SmiCheck check_needed);
 319
 320   // Emits optimized code for %_IsConstructCall().
 321   // Caller should branch on equal condition.
 322   void EmitIsConstructCall(Register temp1, Register temp2);
 323
 324   // Emits optimized code to deep-copy the contents of statically known
 325   // object graphs (e.g. object literal boilerplate).
 326   void EmitDeepCopy(Handle<JSObject> object,
 327                     Register result,
 328                     Register source,
 329                     int* offset,
 330                     AllocationSiteMode mode);
 331
 332   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 333   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 334   template<class T>
 335   void DoLoadKeyedSIMD128ExternalArray(LLoadKeyed* instr);
 336   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 337   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 338   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 339   template<class T>
 340   void DoStoreKeyedSIMD128ExternalArray(LStoreKeyed* instr);
 341   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 342   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 343
 344   ZoneList<LEnvironment*> deoptimizations_;
 345   ZoneList<Deoptimizer::JumpTableEntry> deopt_jump_table_;
 346   ZoneList<Handle<Object> > deoptimization_literals_;
 347   int inlined_function_count_;
 348   Scope* const scope_;
 349   TranslationBuffer translations_;
 350   ZoneList<LDeferredCode*> deferred_;
 351   int osr_pc_offset_;
 352   bool frame_is_built_;
 353
 354   // Builder that keeps track of safepoints in the code. The table
 355   // itself is emitted at the end of the generated code.
 356   SafepointTableBuilder safepoints_;
 357
 358   // Compiler from a set of parallel moves to a sequential list of moves.
 359   LGapResolver resolver_;
 360
 361   Safepoint::Kind expected_safepoint_kind_;
 362
 363   class PushSafepointRegistersScope V8_FINAL BASE_EMBEDDED {
 364    public:
 365     PushSafepointRegistersScope(LCodeGen* codegen,
 366                                 Safepoint::Kind kind)
 367         : codegen_(codegen) {
 368       ASSERT(codegen_->info()->is_calling());
 369       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 370       codegen_->expected_safepoint_kind_ = kind;
 371
 372       switch (codegen_->expected_safepoint_kind_) {
 373         case Safepoint::kWithRegisters:
 374           codegen_->masm_->PushSafepointRegisters();
 375           break;
 376         case Safepoint::kWithRegistersAndDoubles:
 377           codegen_->masm_->PushSafepointRegistersAndDoubles();
 378           break;
 379         default:
 380           UNREACHABLE();
 381       }
 382     }
 383
 384     ~PushSafepointRegistersScope() {
 385       Safepoint::Kind kind = codegen_->expected_safepoint_kind_;
 386       ASSERT((kind & Safepoint::kWithRegisters) != 0);
 387       switch (kind) {
 388         case Safepoint::kWithRegisters:
 389           codegen_->masm_->PopSafepointRegisters();
 390           break;
 391         case Safepoint::kWithRegistersAndDoubles:
 392           codegen_->masm_->PopSafepointRegistersAndDoubles();
 393           break;
 394         default:
 395           UNREACHABLE();
 396       }
 397       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 398     }
 399
 400    private:
 401     LCodeGen* codegen_;
 402   };
 403
 404   friend class LDeferredCode;
 405   friend class LEnvironment;
 406   friend class SafepointGenerator;
 407   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 408 };
 409
 410
 411 class LDeferredCode : public ZoneObject {
 412  public:
 413   explicit LDeferredCode(LCodeGen* codegen)
 414       : codegen_(codegen),
 415         external_exit_(NULL),
 416         instruction_index_(codegen->current_instruction_) {
 417     codegen->AddDeferredCode(this);
 418   }
 419
 420   virtual ~LDeferredCode() {}
 421   virtual void Generate() = 0;
 422   virtual LInstruction* instr() = 0;
 423
 424   void SetExit(Label* exit) { external_exit_ = exit; }
 425   Label* entry() { return &entry_; }
 426   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 427   int instruction_index() const { return instruction_index_; }
 428
 429  protected:
 430   LCodeGen* codegen() const { return codegen_; }
 431   MacroAssembler* masm() const { return codegen_->masm(); }
 432
 433  private:
 434   LCodeGen* codegen_;
 435   Label entry_;
 436   Label exit_;
 437   Label* external_exit_;
 438   int instruction_index_;
 439 };
 440
 441 } }  // namespace v8::internal
 442
 443 #endif  // V8_ARM_LITHIUM_CODEGEN_ARM_H_