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      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_CRANKSHAFT_X64_LITHIUM_CODEGEN_X64_H_
      6 #define V8_CRANKSHAFT_X64_LITHIUM_CODEGEN_X64_H_
      7 
      8 
      9 #include "src/ast/scopes.h"
     10 #include "src/base/logging.h"
     11 #include "src/crankshaft/lithium-codegen.h"
     12 #include "src/crankshaft/x64/lithium-gap-resolver-x64.h"
     13 #include "src/crankshaft/x64/lithium-x64.h"
     14 #include "src/deoptimizer.h"
     15 #include "src/safepoint-table.h"
     16 #include "src/utils.h"
     17 
     18 namespace v8 {
     19 namespace internal {
     20 
     21 // Forward declarations.
     22 class LDeferredCode;
     23 class SafepointGenerator;
     24 
     25 class LCodeGen: public LCodeGenBase {
     26  public:
     27   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
     28       : LCodeGenBase(chunk, assembler, info),
     29         jump_table_(4, info->zone()),
     30         scope_(info->scope()),
     31         deferred_(8, info->zone()),
     32         frame_is_built_(false),
     33         safepoints_(info->zone()),
     34         resolver_(this),
     35         expected_safepoint_kind_(Safepoint::kSimple) {
     36     PopulateDeoptimizationLiteralsWithInlinedFunctions();
     37   }
     38 
     39   int LookupDestination(int block_id) const {
     40     return chunk()->LookupDestination(block_id);
     41   }
     42 
     43   bool IsNextEmittedBlock(int block_id) const {
     44     return LookupDestination(block_id) == GetNextEmittedBlock();
     45   }
     46 
     47   bool NeedsEagerFrame() const {
     48     return GetStackSlotCount() > 0 ||
     49         info()->is_non_deferred_calling() ||
     50         !info()->IsStub() ||
     51         info()->requires_frame();
     52   }
     53   bool NeedsDeferredFrame() const {
     54     return !NeedsEagerFrame() && info()->is_deferred_calling();
     55   }
     56 
     57   // Support for converting LOperands to assembler types.
     58   Register ToRegister(LOperand* op) const;
     59   XMMRegister ToDoubleRegister(LOperand* op) const;
     60   bool IsInteger32Constant(LConstantOperand* op) const;
     61   bool IsExternalConstant(LConstantOperand* op) const;
     62   bool IsDehoistedKeyConstant(LConstantOperand* op) const;
     63   bool IsSmiConstant(LConstantOperand* op) const;
     64   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
     65   int32_t ToInteger32(LConstantOperand* op) const;
     66   Smi* ToSmi(LConstantOperand* op) const;
     67   double ToDouble(LConstantOperand* op) const;
     68   ExternalReference ToExternalReference(LConstantOperand* op) const;
     69   Handle<Object> ToHandle(LConstantOperand* op) const;
     70   Operand ToOperand(LOperand* op) const;
     71 
     72   // Try to generate code for the entire chunk, but it may fail if the
     73   // chunk contains constructs we cannot handle. Returns true if the
     74   // code generation attempt succeeded.
     75   bool GenerateCode();
     76 
     77   // Finish the code by setting stack height, safepoint, and bailout
     78   // information on it.
     79   void FinishCode(Handle<Code> code);
     80 
     81   // Deferred code support.
     82   void DoDeferredNumberTagD(LNumberTagD* instr);
     83 
     84   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
     85   void DoDeferredNumberTagIU(LInstruction* instr,
     86                              LOperand* value,
     87                              LOperand* temp1,
     88                              LOperand* temp2,
     89                              IntegerSignedness signedness);
     90 
     91   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
     92   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
     93   void DoDeferredStackCheck(LStackCheck* instr);
     94   void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
     95   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
     96   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
     97   void DoDeferredAllocate(LAllocate* instr);
     98   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
     99   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
    100                                    Register object,
    101                                    Register index);
    102 
    103 // Parallel move support.
    104   void DoParallelMove(LParallelMove* move);
    105   void DoGap(LGap* instr);
    106 
    107   // Emit frame translation commands for an environment.
    108   void WriteTranslation(LEnvironment* environment, Translation* translation);
    109 
    110   // Declare methods that deal with the individual node types.
    111 #define DECLARE_DO(type) void Do##type(L##type* node);
    112   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
    113 #undef DECLARE_DO
    114 
    115  private:
    116   LanguageMode language_mode() const { return info()->language_mode(); }
    117 
    118   LPlatformChunk* chunk() const { return chunk_; }
    119   Scope* scope() const { return scope_; }
    120   HGraph* graph() const { return chunk()->graph(); }
    121 
    122   XMMRegister double_scratch0() const { return xmm0; }
    123 
    124   void EmitClassOfTest(Label* if_true,
    125                        Label* if_false,
    126                        Handle<String> class_name,
    127                        Register input,
    128                        Register temporary,
    129                        Register scratch);
    130 
    131   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
    132 
    133   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
    134 
    135 
    136   void SaveCallerDoubles();
    137   void RestoreCallerDoubles();
    138 
    139   // Code generation passes.  Returns true if code generation should
    140   // continue.
    141   void GenerateBodyInstructionPre(LInstruction* instr) override;
    142   void GenerateBodyInstructionPost(LInstruction* instr) override;
    143   bool GeneratePrologue();
    144   bool GenerateDeferredCode();
    145   bool GenerateJumpTable();
    146   bool GenerateSafepointTable();
    147 
    148   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
    149   void GenerateOsrPrologue();
    150 
    151   enum SafepointMode {
    152     RECORD_SIMPLE_SAFEPOINT,
    153     RECORD_SAFEPOINT_WITH_REGISTERS
    154   };
    155 
    156   void CallCodeGeneric(Handle<Code> code,
    157                        RelocInfo::Mode mode,
    158                        LInstruction* instr,
    159                        SafepointMode safepoint_mode,
    160                        int argc);
    161 
    162 
    163   void CallCode(Handle<Code> code,
    164                 RelocInfo::Mode mode,
    165                 LInstruction* instr);
    166 
    167   void CallRuntime(const Runtime::Function* function,
    168                    int num_arguments,
    169                    LInstruction* instr,
    170                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
    171 
    172   void CallRuntime(Runtime::FunctionId id,
    173                    int num_arguments,
    174                    LInstruction* instr) {
    175     const Runtime::Function* function = Runtime::FunctionForId(id);
    176     CallRuntime(function, num_arguments, instr);
    177   }
    178 
    179   void CallRuntime(Runtime::FunctionId id, LInstruction* instr) {
    180     const Runtime::Function* function = Runtime::FunctionForId(id);
    181     CallRuntime(function, function->nargs, instr);
    182   }
    183 
    184   void CallRuntimeFromDeferred(Runtime::FunctionId id,
    185                                int argc,
    186                                LInstruction* instr,
    187                                LOperand* context);
    188 
    189   void LoadContextFromDeferred(LOperand* context);
    190 
    191   // Generate a direct call to a known function.  Expects the function
    192   // to be in rdi.
    193   void CallKnownFunction(Handle<JSFunction> function,
    194                          int formal_parameter_count, int arity,
    195                          LInstruction* instr);
    196 
    197   void RecordSafepointWithLazyDeopt(LInstruction* instr,
    198                                     SafepointMode safepoint_mode,
    199                                     int argc);
    200   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
    201                                             Safepoint::DeoptMode mode);
    202   void DeoptimizeIf(Condition cc, LInstruction* instr,
    203                     Deoptimizer::DeoptReason deopt_reason,
    204                     Deoptimizer::BailoutType bailout_type);
    205   void DeoptimizeIf(Condition cc, LInstruction* instr,
    206                     Deoptimizer::DeoptReason deopt_reason);
    207 
    208   bool DeoptEveryNTimes() {
    209     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
    210   }
    211 
    212   void AddToTranslation(LEnvironment* environment,
    213                         Translation* translation,
    214                         LOperand* op,
    215                         bool is_tagged,
    216                         bool is_uint32,
    217                         int* object_index_pointer,
    218                         int* dematerialized_index_pointer);
    219 
    220   Register ToRegister(int index) const;
    221   XMMRegister ToDoubleRegister(int index) const;
    222   Operand BuildFastArrayOperand(
    223       LOperand* elements_pointer,
    224       LOperand* key,
    225       Representation key_representation,
    226       ElementsKind elements_kind,
    227       uint32_t base_offset);
    228 
    229   Operand BuildSeqStringOperand(Register string,
    230                                 LOperand* index,
    231                                 String::Encoding encoding);
    232 
    233   void EmitIntegerMathAbs(LMathAbs* instr);
    234   void EmitSmiMathAbs(LMathAbs* instr);
    235 
    236   // Support for recording safepoint and position information.
    237   void RecordSafepoint(LPointerMap* pointers,
    238                        Safepoint::Kind kind,
    239                        int arguments,
    240                        Safepoint::DeoptMode mode);
    241   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
    242   void RecordSafepoint(Safepoint::DeoptMode mode);
    243   void RecordSafepointWithRegisters(LPointerMap* pointers,
    244                                     int arguments,
    245                                     Safepoint::DeoptMode mode);
    246   void RecordAndWritePosition(int position) override;
    247 
    248   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
    249   void EmitGoto(int block);
    250 
    251   // EmitBranch expects to be the last instruction of a block.
    252   template<class InstrType>
    253   void EmitBranch(InstrType instr, Condition cc);
    254   template <class InstrType>
    255   void EmitTrueBranch(InstrType instr, Condition cc);
    256   template <class InstrType>
    257   void EmitFalseBranch(InstrType instr, Condition cc);
    258   void EmitNumberUntagD(LNumberUntagD* instr, Register input,
    259                         XMMRegister result, NumberUntagDMode mode);
    260 
    261   // Emits optimized code for typeof x == "y".  Modifies input register.
    262   // Returns the condition on which a final split to
    263   // true and false label should be made, to optimize fallthrough.
    264   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
    265 
    266   // Emits optimized code for %_IsString(x).  Preserves input register.
    267   // Returns the condition on which a final split to
    268   // true and false label should be made, to optimize fallthrough.
    269   Condition EmitIsString(Register input,
    270                          Register temp1,
    271                          Label* is_not_string,
    272                          SmiCheck check_needed);
    273 
    274   // Emits code for pushing either a tagged constant, a (non-double)
    275   // register, or a stack slot operand.
    276   void EmitPushTaggedOperand(LOperand* operand);
    277 
    278   // Emits optimized code to deep-copy the contents of statically known
    279   // object graphs (e.g. object literal boilerplate).
    280   void EmitDeepCopy(Handle<JSObject> object,
    281                     Register result,
    282                     Register source,
    283                     int* offset,
    284                     AllocationSiteMode mode);
    285 
    286   void EnsureSpaceForLazyDeopt(int space_needed) override;
    287   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
    288   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
    289   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
    290   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
    291   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
    292   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
    293 
    294   template <class T>
    295   void EmitVectorLoadICRegisters(T* instr);
    296   template <class T>
    297   void EmitVectorStoreICRegisters(T* instr);
    298 
    299 #ifdef _MSC_VER
    300   // On windows, you may not access the stack more than one page below
    301   // the most recently mapped page. To make the allocated area randomly
    302   // accessible, we write an arbitrary value to each page in range
    303   // rsp + offset - page_size .. rsp in turn.
    304   void MakeSureStackPagesMapped(int offset);
    305 #endif
    306 
    307   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
    308   Scope* const scope_;
    309   ZoneList<LDeferredCode*> deferred_;
    310   bool frame_is_built_;
    311 
    312   // Builder that keeps track of safepoints in the code. The table
    313   // itself is emitted at the end of the generated code.
    314   SafepointTableBuilder safepoints_;
    315 
    316   // Compiler from a set of parallel moves to a sequential list of moves.
    317   LGapResolver resolver_;
    318 
    319   Safepoint::Kind expected_safepoint_kind_;
    320 
    321   class PushSafepointRegistersScope final BASE_EMBEDDED {
    322    public:
    323     explicit PushSafepointRegistersScope(LCodeGen* codegen)
    324         : codegen_(codegen) {
    325       DCHECK(codegen_->info()->is_calling());
    326       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
    327       codegen_->masm_->PushSafepointRegisters();
    328       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
    329     }
    330 
    331     ~PushSafepointRegistersScope() {
    332       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
    333       codegen_->masm_->PopSafepointRegisters();
    334       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
    335     }
    336 
    337    private:
    338     LCodeGen* codegen_;
    339   };
    340 
    341   friend class LDeferredCode;
    342   friend class LEnvironment;
    343   friend class SafepointGenerator;
    344   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
    345 };
    346 
    347 
    348 class LDeferredCode: public ZoneObject {
    349  public:
    350   explicit LDeferredCode(LCodeGen* codegen)
    351       : codegen_(codegen),
    352         external_exit_(NULL),
    353         instruction_index_(codegen->current_instruction_) {
    354     codegen->AddDeferredCode(this);
    355   }
    356 
    357   virtual ~LDeferredCode() {}
    358   virtual void Generate() = 0;
    359   virtual LInstruction* instr() = 0;
    360 
    361   void SetExit(Label* exit) { external_exit_ = exit; }
    362   Label* entry() { return &entry_; }
    363   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
    364   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
    365   int instruction_index() const { return instruction_index_; }
    366 
    367  protected:
    368   LCodeGen* codegen() const { return codegen_; }
    369   MacroAssembler* masm() const { return codegen_->masm(); }
    370 
    371  private:
    372   LCodeGen* codegen_;
    373   Label entry_;
    374   Label exit_;
    375   Label done_;
    376   Label* external_exit_;
    377   int instruction_index_;
    378 };
    379 
    380 }  // namespace internal
    381 }  // namespace v8
    382 
    383 #endif  // V8_CRANKSHAFT_X64_LITHIUM_CODEGEN_X64_H_
    384