src/v8/src/mips/lithium-codegen-mips.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_MIPS_LITHIUM_CODEGEN_MIPS_H_
   6 #define V8_MIPS_LITHIUM_CODEGEN_MIPS_H_
   7
   8 #include "src/deoptimizer.h"
   9 #include "src/lithium-codegen.h"
  10 #include "src/mips/lithium-gap-resolver-mips.h"
  11 #include "src/mips/lithium-mips.h"
  12 #include "src/safepoint-table.h"
  13 #include "src/scopes.h"
  14 #include "src/utils.h"
  15
  16 namespace v8 {
  17 namespace internal {
  18
  19 // Forward declarations.
  20 class LDeferredCode;
  21 class SafepointGenerator;
  22
  23 class LCodeGen: public LCodeGenBase {
  24  public:
  25   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
  26       : LCodeGenBase(chunk, assembler, info),
  27         deoptimizations_(4, info->zone()),
  28         deopt_jump_table_(4, info->zone()),
  29         deoptimization_literals_(8, info->zone()),
  30         inlined_function_count_(0),
  31         scope_(info->scope()),
  32         translations_(info->zone()),
  33         deferred_(8, info->zone()),
  34         osr_pc_offset_(-1),
  35         frame_is_built_(false),
  36         safepoints_(info->zone()),
  37         resolver_(this),
  38         expected_safepoint_kind_(Safepoint::kSimple) {
  39     PopulateDeoptimizationLiteralsWithInlinedFunctions();
  40   }
  41
  42
  43   int LookupDestination(int block_id) const {
  44     return chunk()->LookupDestination(block_id);
  45   }
  46
  47   bool IsNextEmittedBlock(int block_id) const {
  48     return LookupDestination(block_id) == GetNextEmittedBlock();
  49   }
  50
  51   bool NeedsEagerFrame() const {
  52     return GetStackSlotCount() > 0 ||
  53         info()->is_non_deferred_calling() ||
  54         !info()->IsStub() ||
  55         info()->requires_frame();
  56   }
  57   bool NeedsDeferredFrame() const {
  58     return !NeedsEagerFrame() && info()->is_deferred_calling();
  59   }
  60
  61   RAStatus GetRAState() const {
  62     return frame_is_built_ ? kRAHasBeenSaved : kRAHasNotBeenSaved;
  63   }
  64
  65   // Support for converting LOperands to assembler types.
  66   // LOperand must be a register.
  67   Register ToRegister(LOperand* op) const;
  68
  69   // LOperand is loaded into scratch, unless already a register.
  70   Register EmitLoadRegister(LOperand* op, Register scratch);
  71
  72   // LOperand must be a double register.
  73   DoubleRegister ToDoubleRegister(LOperand* op) const;
  74
  75   // LOperand is loaded into dbl_scratch, unless already a double register.
  76   DoubleRegister EmitLoadDoubleRegister(LOperand* op,
  77                                         FloatRegister flt_scratch,
  78                                         DoubleRegister dbl_scratch);
  79   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
  80   int32_t ToInteger32(LConstantOperand* op) const;
  81   Smi* ToSmi(LConstantOperand* op) const;
  82   double ToDouble(LConstantOperand* op) const;
  83   Operand ToOperand(LOperand* op);
  84   MemOperand ToMemOperand(LOperand* op) const;
  85   // Returns a MemOperand pointing to the high word of a DoubleStackSlot.
  86   MemOperand ToHighMemOperand(LOperand* op) const;
  87
  88   bool IsInteger32(LConstantOperand* op) const;
  89   bool IsSmi(LConstantOperand* op) const;
  90   Handle<Object> ToHandle(LConstantOperand* op) const;
  91
  92   // Try to generate code for the entire chunk, but it may fail if the
  93   // chunk contains constructs we cannot handle. Returns true if the
  94   // code generation attempt succeeded.
  95   bool GenerateCode();
  96
  97   // Finish the code by setting stack height, safepoint, and bailout
  98   // information on it.
  99   void FinishCode(Handle<Code> code);
 100
 101   void DoDeferredNumberTagD(LNumberTagD* instr);
 102
 103   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
 104   void DoDeferredNumberTagIU(LInstruction* instr,
 105                              LOperand* value,
 106                              LOperand* temp1,
 107                              LOperand* temp2,
 108                              IntegerSignedness signedness);
 109
 110   void DoDeferredTaggedToI(LTaggedToI* instr);
 111   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
 112   void DoDeferredStackCheck(LStackCheck* instr);
 113   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
 114   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
 115   void DoDeferredAllocate(LAllocate* instr);
 116   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
 117                                        Label* map_check);
 118
 119   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
 120   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
 121                                    Register result,
 122                                    Register object,
 123                                    Register index);
 124
 125   // Parallel move support.
 126   void DoParallelMove(LParallelMove* move);
 127   void DoGap(LGap* instr);
 128
 129   MemOperand PrepareKeyedOperand(Register key,
 130                                  Register base,
 131                                  bool key_is_constant,
 132                                  int constant_key,
 133                                  int element_size,
 134                                  int shift_size,
 135                                  int base_offset);
 136
 137   // Emit frame translation commands for an environment.
 138   void WriteTranslation(LEnvironment* environment, Translation* translation);
 139
 140   // Declare methods that deal with the individual node types.
 141 #define DECLARE_DO(type) void Do##type(L##type* node);
 142   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 143 #undef DECLARE_DO
 144
 145  private:
 146   StrictMode strict_mode() const { return info()->strict_mode(); }
 147
 148   Scope* scope() const { return scope_; }
 149
 150   Register scratch0() { return kLithiumScratchReg; }
 151   Register scratch1() { return kLithiumScratchReg2; }
 152   DoubleRegister double_scratch0() { return kLithiumScratchDouble; }
 153
 154   LInstruction* GetNextInstruction();
 155
 156   void EmitClassOfTest(Label* if_true,
 157                        Label* if_false,
 158                        Handle<String> class_name,
 159                        Register input,
 160                        Register temporary,
 161                        Register temporary2);
 162
 163   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
 164
 165   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
 166
 167   void SaveCallerDoubles();
 168   void RestoreCallerDoubles();
 169
 170   // Code generation passes.  Returns true if code generation should
 171   // continue.
 172   void GenerateBodyInstructionPre(LInstruction* instr) V8_OVERRIDE;
 173   bool GeneratePrologue();
 174   bool GenerateDeferredCode();
 175   bool GenerateDeoptJumpTable();
 176   bool GenerateSafepointTable();
 177
 178   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
 179   void GenerateOsrPrologue();
 180
 181   enum SafepointMode {
 182     RECORD_SIMPLE_SAFEPOINT,
 183     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
 184   };
 185
 186   void CallCode(Handle<Code> code,
 187                 RelocInfo::Mode mode,
 188                 LInstruction* instr);
 189
 190   void CallCodeGeneric(Handle<Code> code,
 191                        RelocInfo::Mode mode,
 192                        LInstruction* instr,
 193                        SafepointMode safepoint_mode);
 194
 195   void CallRuntime(const Runtime::Function* function,
 196                    int num_arguments,
 197                    LInstruction* instr,
 198                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 199
 200   void CallRuntime(Runtime::FunctionId id,
 201                    int num_arguments,
 202                    LInstruction* instr) {
 203     const Runtime::Function* function = Runtime::FunctionForId(id);
 204     CallRuntime(function, num_arguments, instr);
 205   }
 206
 207   void LoadContextFromDeferred(LOperand* context);
 208   void CallRuntimeFromDeferred(Runtime::FunctionId id,
 209                                int argc,
 210                                LInstruction* instr,
 211                                LOperand* context);
 212
 213   enum A1State {
 214     A1_UNINITIALIZED,
 215     A1_CONTAINS_TARGET
 216   };
 217
 218   // Generate a direct call to a known function.  Expects the function
 219   // to be in a1.
 220   void CallKnownFunction(Handle<JSFunction> function,
 221                          int formal_parameter_count,
 222                          int arity,
 223                          LInstruction* instr,
 224                          A1State a1_state);
 225
 226   void RecordSafepointWithLazyDeopt(LInstruction* instr,
 227                                     SafepointMode safepoint_mode);
 228
 229   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
 230                                             Safepoint::DeoptMode mode);
 231   void DeoptimizeIf(Condition condition,
 232                     LEnvironment* environment,
 233                     Deoptimizer::BailoutType bailout_type,
 234                     Register src1 = zero_reg,
 235                     const Operand& src2 = Operand(zero_reg));
 236   void DeoptimizeIf(Condition condition,
 237                     LEnvironment* environment,
 238                     Register src1 = zero_reg,
 239                     const Operand& src2 = Operand(zero_reg));
 240
 241   void AddToTranslation(LEnvironment* environment,
 242                         Translation* translation,
 243                         LOperand* op,
 244                         bool is_tagged,
 245                         bool is_uint32,
 246                         int* object_index_pointer,
 247                         int* dematerialized_index_pointer);
 248   void PopulateDeoptimizationData(Handle<Code> code);
 249   int DefineDeoptimizationLiteral(Handle<Object> literal);
 250
 251   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 252
 253   Register ToRegister(int index) const;
 254   DoubleRegister ToDoubleRegister(int index) const;
 255
 256   MemOperand BuildSeqStringOperand(Register string,
 257                                    LOperand* index,
 258                                    String::Encoding encoding);
 259
 260   void EmitIntegerMathAbs(LMathAbs* instr);
 261
 262   // Support for recording safepoint and position information.
 263   void RecordSafepoint(LPointerMap* pointers,
 264                        Safepoint::Kind kind,
 265                        int arguments,
 266                        Safepoint::DeoptMode mode);
 267   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
 268   void RecordSafepoint(Safepoint::DeoptMode mode);
 269   void RecordSafepointWithRegisters(LPointerMap* pointers,
 270                                     int arguments,
 271                                     Safepoint::DeoptMode mode);
 272
 273   void RecordAndWritePosition(int position) V8_OVERRIDE;
 274
 275   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
 276   void EmitGoto(int block);
 277
 278   // EmitBranch expects to be the last instruction of a block.
 279   template<class InstrType>
 280   void EmitBranch(InstrType instr,
 281                   Condition condition,
 282                   Register src1,
 283                   const Operand& src2);
 284   template<class InstrType>
 285   void EmitBranchF(InstrType instr,
 286                    Condition condition,
 287                    FPURegister src1,
 288                    FPURegister src2);
 289   template<class InstrType>
 290   void EmitFalseBranch(InstrType instr,
 291                        Condition condition,
 292                        Register src1,
 293                        const Operand& src2);
 294   template<class InstrType>
 295   void EmitFalseBranchF(InstrType instr,
 296                         Condition condition,
 297                         FPURegister src1,
 298                         FPURegister src2);
 299   void EmitCmpI(LOperand* left, LOperand* right);
 300   void EmitNumberUntagD(Register input,
 301                         DoubleRegister result,
 302                         bool allow_undefined_as_nan,
 303                         bool deoptimize_on_minus_zero,
 304                         LEnvironment* env,
 305                         NumberUntagDMode mode);
 306
 307   // Emits optimized code for typeof x == "y".  Modifies input register.
 308   // Returns the condition on which a final split to
 309   // true and false label should be made, to optimize fallthrough.
 310   // Returns two registers in cmp1 and cmp2 that can be used in the
 311   // Branch instruction after EmitTypeofIs.
 312   Condition EmitTypeofIs(Label* true_label,
 313                          Label* false_label,
 314                          Register input,
 315                          Handle<String> type_name,
 316                          Register* cmp1,
 317                          Operand* cmp2);
 318
 319   // Emits optimized code for %_IsObject(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 EmitIsObject(Register input,
 323                          Register temp1,
 324                          Register temp2,
 325                          Label* is_not_object,
 326                          Label* is_object);
 327
 328   // Emits optimized code for %_IsString(x).  Preserves input register.
 329   // Returns the condition on which a final split to
 330   // true and false label should be made, to optimize fallthrough.
 331   Condition EmitIsString(Register input,
 332                          Register temp1,
 333                          Label* is_not_string,
 334                          SmiCheck check_needed);
 335
 336   // Emits optimized code for %_IsConstructCall().
 337   // Caller should branch on equal condition.
 338   void EmitIsConstructCall(Register temp1, Register temp2);
 339
 340   // Emits optimized code to deep-copy the contents of statically known
 341   // object graphs (e.g. object literal boilerplate).
 342   void EmitDeepCopy(Handle<JSObject> object,
 343                     Register result,
 344                     Register source,
 345                     int* offset,
 346                     AllocationSiteMode mode);
 347   // Emit optimized code for integer division.
 348   // Inputs are signed.
 349   // All registers are clobbered.
 350   // If 'remainder' is no_reg, it is not computed.
 351   void EmitSignedIntegerDivisionByConstant(Register result,
 352                                            Register dividend,
 353                                            int32_t divisor,
 354                                            Register remainder,
 355                                            Register scratch,
 356                                            LEnvironment* environment);
 357
 358
 359   void EnsureSpaceForLazyDeopt(int space_needed) V8_OVERRIDE;
 360   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
 361   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
 362   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
 363   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
 364   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
 365   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
 366
 367   ZoneList<LEnvironment*> deoptimizations_;
 368   ZoneList<Deoptimizer::JumpTableEntry> deopt_jump_table_;
 369   ZoneList<Handle<Object> > deoptimization_literals_;
 370   int inlined_function_count_;
 371   Scope* const scope_;
 372   TranslationBuffer translations_;
 373   ZoneList<LDeferredCode*> deferred_;
 374   int osr_pc_offset_;
 375   bool frame_is_built_;
 376
 377   // Builder that keeps track of safepoints in the code. The table
 378   // itself is emitted at the end of the generated code.
 379   SafepointTableBuilder safepoints_;
 380
 381   // Compiler from a set of parallel moves to a sequential list of moves.
 382   LGapResolver resolver_;
 383
 384   Safepoint::Kind expected_safepoint_kind_;
 385
 386   class PushSafepointRegistersScope V8_FINAL BASE_EMBEDDED {
 387    public:
 388     explicit PushSafepointRegistersScope(LCodeGen* codegen)
 389         : codegen_(codegen) {
 390       DCHECK(codegen_->info()->is_calling());
 391       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
 392       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
 393
 394       StoreRegistersStateStub stub(codegen_->isolate());
 395       codegen_->masm_->push(ra);
 396       codegen_->masm_->CallStub(&stub);
 397     }
 398
 399     ~PushSafepointRegistersScope() {
 400       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
 401       RestoreRegistersStateStub stub(codegen_->isolate());
 402       codegen_->masm_->push(ra);
 403       codegen_->masm_->CallStub(&stub);
 404       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
 405     }
 406
 407    private:
 408     LCodeGen* codegen_;
 409   };
 410
 411   friend class LDeferredCode;
 412   friend class LEnvironment;
 413   friend class SafepointGenerator;
 414   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
 415 };
 416
 417
 418 class LDeferredCode : public ZoneObject {
 419  public:
 420   explicit LDeferredCode(LCodeGen* codegen)
 421       : codegen_(codegen),
 422         external_exit_(NULL),
 423         instruction_index_(codegen->current_instruction_) {
 424     codegen->AddDeferredCode(this);
 425   }
 426
 427   virtual ~LDeferredCode() {}
 428   virtual void Generate() = 0;
 429   virtual LInstruction* instr() = 0;
 430
 431   void SetExit(Label* exit) { external_exit_ = exit; }
 432   Label* entry() { return &entry_; }
 433   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
 434   int instruction_index() const { return instruction_index_; }
 435
 436  protected:
 437   LCodeGen* codegen() const { return codegen_; }
 438   MacroAssembler* masm() const { return codegen_->masm(); }
 439
 440  private:
 441   LCodeGen* codegen_;
 442   Label entry_;
 443   Label exit_;
 444   Label* external_exit_;
 445   int instruction_index_;
 446 };
 447
 448 } }  // namespace v8::internal
 449
 450 #endif  // V8_MIPS_LITHIUM_CODEGEN_MIPS_H_