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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_X87_LITHIUM_CODEGEN_X87_H_
      6 #define V8_CRANKSHAFT_X87_LITHIUM_CODEGEN_X87_H_
      7 
      8 #include <map>
      9 
     10 #include "src/ast/scopes.h"
     11 #include "src/base/logging.h"
     12 #include "src/crankshaft/lithium-codegen.h"
     13 #include "src/crankshaft/x87/lithium-gap-resolver-x87.h"
     14 #include "src/crankshaft/x87/lithium-x87.h"
     15 #include "src/deoptimizer.h"
     16 #include "src/safepoint-table.h"
     17 #include "src/utils.h"
     18 
     19 namespace v8 {
     20 namespace internal {
     21 
     22 // Forward declarations.
     23 class LDeferredCode;
     24 class LGapNode;
     25 class SafepointGenerator;
     26 
     27 class LCodeGen: public LCodeGenBase {
     28  public:
     29   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
     30       : LCodeGenBase(chunk, assembler, info),
     31         jump_table_(4, info->zone()),
     32         scope_(info->scope()),
     33         deferred_(8, info->zone()),
     34         frame_is_built_(false),
     35         x87_stack_(assembler),
     36         safepoints_(info->zone()),
     37         resolver_(this),
     38         expected_safepoint_kind_(Safepoint::kSimple) {
     39     PopulateDeoptimizationLiteralsWithInlinedFunctions();
     40   }
     41 
     42   int LookupDestination(int block_id) const {
     43     return chunk()->LookupDestination(block_id);
     44   }
     45 
     46   bool IsNextEmittedBlock(int block_id) const {
     47     return LookupDestination(block_id) == GetNextEmittedBlock();
     48   }
     49 
     50   bool NeedsEagerFrame() const {
     51     return HasAllocatedStackSlots() || info()->is_non_deferred_calling() ||
     52            !info()->IsStub() || info()->requires_frame();
     53   }
     54   bool NeedsDeferredFrame() const {
     55     return !NeedsEagerFrame() && info()->is_deferred_calling();
     56   }
     57 
     58   // Support for converting LOperands to assembler types.
     59   Operand ToOperand(LOperand* op) const;
     60   Register ToRegister(LOperand* op) const;
     61   X87Register ToX87Register(LOperand* op) const;
     62 
     63   bool IsInteger32(LConstantOperand* op) const;
     64   bool IsSmi(LConstantOperand* op) const;
     65   Immediate ToImmediate(LOperand* op, const Representation& r) const {
     66     return Immediate(ToRepresentation(LConstantOperand::cast(op), r));
     67   }
     68   double ToDouble(LConstantOperand* op) const;
     69 
     70   // Support for non-sse2 (x87) floating point stack handling.
     71   // These functions maintain the mapping of physical stack registers to our
     72   // virtual registers between instructions.
     73   enum X87OperandType { kX87DoubleOperand, kX87FloatOperand, kX87IntOperand };
     74 
     75   void X87Mov(X87Register reg, Operand src,
     76       X87OperandType operand = kX87DoubleOperand);
     77   void X87Mov(Operand src, X87Register reg,
     78       X87OperandType operand = kX87DoubleOperand);
     79   void X87Mov(X87Register reg, X87Register src,
     80               X87OperandType operand = kX87DoubleOperand);
     81 
     82   void X87PrepareBinaryOp(
     83       X87Register left, X87Register right, X87Register result);
     84 
     85   void X87LoadForUsage(X87Register reg);
     86   void X87LoadForUsage(X87Register reg1, X87Register reg2);
     87   void X87PrepareToWrite(X87Register reg) { x87_stack_.PrepareToWrite(reg); }
     88   void X87CommitWrite(X87Register reg) { x87_stack_.CommitWrite(reg); }
     89 
     90   void X87Fxch(X87Register reg, int other_slot = 0) {
     91     x87_stack_.Fxch(reg, other_slot);
     92   }
     93   void X87Free(X87Register reg) {
     94     x87_stack_.Free(reg);
     95   }
     96 
     97 
     98   bool X87StackEmpty() {
     99     return x87_stack_.depth() == 0;
    100   }
    101 
    102   Handle<Object> ToHandle(LConstantOperand* op) const;
    103 
    104   // The operand denoting the second word (the one with a higher address) of
    105   // a double stack slot.
    106   Operand HighOperand(LOperand* op);
    107 
    108   // Try to generate code for the entire chunk, but it may fail if the
    109   // chunk contains constructs we cannot handle. Returns true if the
    110   // code generation attempt succeeded.
    111   bool GenerateCode();
    112 
    113   // Finish the code by setting stack height, safepoint, and bailout
    114   // information on it.
    115   void FinishCode(Handle<Code> code);
    116 
    117   // Deferred code support.
    118   void DoDeferredNumberTagD(LNumberTagD* instr);
    119 
    120   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
    121   void DoDeferredNumberTagIU(LInstruction* instr,
    122                              LOperand* value,
    123                              LOperand* temp,
    124                              IntegerSignedness signedness);
    125 
    126   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
    127   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
    128   void DoDeferredStackCheck(LStackCheck* instr);
    129   void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
    130   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
    131   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
    132   void DoDeferredAllocate(LAllocate* instr);
    133   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
    134   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
    135                                    Register object,
    136                                    Register index);
    137 
    138   // Parallel move support.
    139   void DoParallelMove(LParallelMove* move);
    140   void DoGap(LGap* instr);
    141 
    142   // Emit frame translation commands for an environment.
    143   void WriteTranslation(LEnvironment* environment, Translation* translation);
    144 
    145   void EnsureRelocSpaceForDeoptimization();
    146 
    147   // Declare methods that deal with the individual node types.
    148 #define DECLARE_DO(type) void Do##type(L##type* node);
    149   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
    150 #undef DECLARE_DO
    151 
    152  private:
    153   Scope* scope() const { return scope_; }
    154 
    155   void EmitClassOfTest(Label* if_true,
    156                        Label* if_false,
    157                        Handle<String> class_name,
    158                        Register input,
    159                        Register temporary,
    160                        Register temporary2);
    161 
    162   bool HasAllocatedStackSlots() const {
    163     return chunk()->HasAllocatedStackSlots();
    164   }
    165   int GetStackSlotCount() const { return chunk()->GetSpillSlotCount(); }
    166   int GetTotalFrameSlotCount() const {
    167     return chunk()->GetTotalFrameSlotCount();
    168   }
    169 
    170   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
    171 
    172   // Code generation passes.  Returns true if code generation should
    173   // continue.
    174   void GenerateBodyInstructionPre(LInstruction* instr) override;
    175   void GenerateBodyInstructionPost(LInstruction* instr) override;
    176   bool GeneratePrologue();
    177   bool GenerateDeferredCode();
    178   bool GenerateJumpTable();
    179   bool GenerateSafepointTable();
    180 
    181   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
    182   void GenerateOsrPrologue();
    183 
    184   enum SafepointMode {
    185     RECORD_SIMPLE_SAFEPOINT,
    186     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
    187   };
    188 
    189   void CallCode(Handle<Code> code,
    190                 RelocInfo::Mode mode,
    191                 LInstruction* instr);
    192 
    193   void CallCodeGeneric(Handle<Code> code,
    194                        RelocInfo::Mode mode,
    195                        LInstruction* instr,
    196                        SafepointMode safepoint_mode);
    197 
    198   void CallRuntime(const Runtime::Function* fun, int argc, LInstruction* instr,
    199                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
    200 
    201   void CallRuntime(Runtime::FunctionId id,
    202                    int argc,
    203                    LInstruction* instr) {
    204     const Runtime::Function* function = Runtime::FunctionForId(id);
    205     CallRuntime(function, argc, instr);
    206   }
    207 
    208   void CallRuntime(Runtime::FunctionId id, LInstruction* instr) {
    209     const Runtime::Function* function = Runtime::FunctionForId(id);
    210     CallRuntime(function, function->nargs, instr);
    211   }
    212 
    213   void CallRuntimeFromDeferred(Runtime::FunctionId id,
    214                                int argc,
    215                                LInstruction* instr,
    216                                LOperand* context);
    217 
    218   void LoadContextFromDeferred(LOperand* context);
    219 
    220   void PrepareForTailCall(const ParameterCount& actual, Register scratch1,
    221                           Register scratch2, Register scratch3);
    222 
    223   // Generate a direct call to a known function. Expects the function
    224   // to be in edi.
    225   void CallKnownFunction(Handle<JSFunction> function,
    226                          int formal_parameter_count, int arity,
    227                          bool is_tail_call, LInstruction* instr);
    228 
    229   void RecordSafepointWithLazyDeopt(LInstruction* instr,
    230                                     SafepointMode safepoint_mode);
    231 
    232   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
    233                                             Safepoint::DeoptMode mode);
    234   void DeoptimizeIf(Condition cc, LInstruction* instr,
    235                     DeoptimizeReason deopt_reason,
    236                     Deoptimizer::BailoutType bailout_type);
    237   void DeoptimizeIf(Condition cc, LInstruction* instr,
    238                     DeoptimizeReason deopt_reason);
    239 
    240   bool DeoptEveryNTimes() {
    241     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
    242   }
    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 
    252   Register ToRegister(int index) const;
    253   X87Register ToX87Register(int index) const;
    254   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
    255   int32_t ToInteger32(LConstantOperand* op) const;
    256   ExternalReference ToExternalReference(LConstantOperand* op) const;
    257 
    258   Operand BuildFastArrayOperand(LOperand* elements_pointer,
    259                                 LOperand* key,
    260                                 Representation key_representation,
    261                                 ElementsKind elements_kind,
    262                                 uint32_t base_offset);
    263 
    264   Operand BuildSeqStringOperand(Register string,
    265                                 LOperand* index,
    266                                 String::Encoding encoding);
    267 
    268   void EmitIntegerMathAbs(LMathAbs* instr);
    269 
    270   // Support for recording safepoint information.
    271   void RecordSafepoint(LPointerMap* pointers,
    272                        Safepoint::Kind kind,
    273                        int arguments,
    274                        Safepoint::DeoptMode mode);
    275   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
    276   void RecordSafepoint(Safepoint::DeoptMode mode);
    277   void RecordSafepointWithRegisters(LPointerMap* pointers,
    278                                     int arguments,
    279                                     Safepoint::DeoptMode mode);
    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 cc);
    287   template <class InstrType>
    288   void EmitTrueBranch(InstrType instr, Condition cc);
    289   template <class InstrType>
    290   void EmitFalseBranch(InstrType instr, Condition cc);
    291   void EmitNumberUntagDNoSSE2(LNumberUntagD* instr, Register input,
    292                               Register temp, X87Register res_reg,
    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(LTypeofIsAndBranch* instr, Register input);
    299 
    300   // Emits optimized code for %_IsString(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 EmitIsString(Register input,
    304                          Register temp1,
    305                          Label* is_not_string,
    306                          SmiCheck check_needed);
    307 
    308   // Emits optimized code to deep-copy the contents of statically known
    309   // object graphs (e.g. object literal boilerplate).
    310   void EmitDeepCopy(Handle<JSObject> object,
    311                     Register result,
    312                     Register source,
    313                     int* offset,
    314                     AllocationSiteMode mode);
    315 
    316   void EnsureSpaceForLazyDeopt(int space_needed) override;
    317   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
    318   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
    319   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
    320   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
    321   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
    322   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
    323 
    324   template <class T>
    325   void EmitVectorLoadICRegisters(T* instr);
    326 
    327   void EmitReturn(LReturn* instr);
    328 
    329   // Emits code for pushing either a tagged constant, a (non-double)
    330   // register, or a stack slot operand.
    331   void EmitPushTaggedOperand(LOperand* operand);
    332 
    333   void X87Fld(Operand src, X87OperandType opts);
    334 
    335   void EmitFlushX87ForDeopt();
    336   void FlushX87StackIfNecessary(LInstruction* instr) {
    337     x87_stack_.FlushIfNecessary(instr, this);
    338   }
    339   friend class LGapResolver;
    340 
    341 #ifdef _MSC_VER
    342   // On windows, you may not access the stack more than one page below
    343   // the most recently mapped page. To make the allocated area randomly
    344   // accessible, we write an arbitrary value to each page in range
    345   // esp + offset - page_size .. esp in turn.
    346   void MakeSureStackPagesMapped(int offset);
    347 #endif
    348 
    349   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
    350   Scope* const scope_;
    351   ZoneList<LDeferredCode*> deferred_;
    352   bool frame_is_built_;
    353 
    354   class X87Stack : public ZoneObject {
    355    public:
    356     explicit X87Stack(MacroAssembler* masm)
    357         : stack_depth_(0), is_mutable_(true), masm_(masm) { }
    358     explicit X87Stack(const X87Stack& other)
    359         : stack_depth_(other.stack_depth_), is_mutable_(false), masm_(masm()) {
    360       for (int i = 0; i < stack_depth_; i++) {
    361         stack_[i] = other.stack_[i];
    362       }
    363     }
    364     bool operator==(const X87Stack& other) const {
    365       if (stack_depth_ != other.stack_depth_) return false;
    366       for (int i = 0; i < stack_depth_; i++) {
    367         if (!stack_[i].is(other.stack_[i])) return false;
    368       }
    369       return true;
    370     }
    371     X87Stack& operator=(const X87Stack& other) {
    372       stack_depth_ = other.stack_depth_;
    373       for (int i = 0; i < stack_depth_; i++) {
    374         stack_[i] = other.stack_[i];
    375       }
    376       return *this;
    377     }
    378     bool Contains(X87Register reg);
    379     void Fxch(X87Register reg, int other_slot = 0);
    380     void Free(X87Register reg);
    381     void PrepareToWrite(X87Register reg);
    382     void CommitWrite(X87Register reg);
    383     void FlushIfNecessary(LInstruction* instr, LCodeGen* cgen);
    384     void LeavingBlock(int current_block_id, LGoto* goto_instr, LCodeGen* cgen);
    385     int depth() const { return stack_depth_; }
    386     int GetLayout();
    387     int st(X87Register reg) { return st2idx(ArrayIndex(reg)); }
    388     void pop() {
    389       DCHECK(is_mutable_);
    390       USE(is_mutable_);
    391       stack_depth_--;
    392     }
    393     void push(X87Register reg) {
    394       DCHECK(is_mutable_);
    395       DCHECK(stack_depth_ < X87Register::kMaxNumAllocatableRegisters);
    396       stack_[stack_depth_] = reg;
    397       stack_depth_++;
    398     }
    399 
    400     MacroAssembler* masm() const { return masm_; }
    401     Isolate* isolate() const { return masm_->isolate(); }
    402 
    403    private:
    404     int ArrayIndex(X87Register reg);
    405     int st2idx(int pos);
    406 
    407     X87Register stack_[X87Register::kMaxNumAllocatableRegisters];
    408     int stack_depth_;
    409     bool is_mutable_;
    410     MacroAssembler* masm_;
    411   };
    412   X87Stack x87_stack_;
    413   // block_id -> X87Stack*;
    414   typedef std::map<int, X87Stack*> X87StackMap;
    415   X87StackMap x87_stack_map_;
    416 
    417   // Builder that keeps track of safepoints in the code. The table
    418   // itself is emitted at the end of the generated code.
    419   SafepointTableBuilder safepoints_;
    420 
    421   // Compiler from a set of parallel moves to a sequential list of moves.
    422   LGapResolver resolver_;
    423 
    424   Safepoint::Kind expected_safepoint_kind_;
    425 
    426   class PushSafepointRegistersScope final BASE_EMBEDDED {
    427    public:
    428     explicit PushSafepointRegistersScope(LCodeGen* codegen)
    429         : codegen_(codegen) {
    430       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
    431       codegen_->masm_->PushSafepointRegisters();
    432       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
    433       DCHECK(codegen_->info()->is_calling());
    434     }
    435 
    436     ~PushSafepointRegistersScope() {
    437       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
    438       codegen_->masm_->PopSafepointRegisters();
    439       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
    440     }
    441 
    442    private:
    443     LCodeGen* codegen_;
    444   };
    445 
    446   friend class LDeferredCode;
    447   friend class LEnvironment;
    448   friend class SafepointGenerator;
    449   friend class X87Stack;
    450   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
    451 };
    452 
    453 
    454 class LDeferredCode : public ZoneObject {
    455  public:
    456   explicit LDeferredCode(LCodeGen* codegen, const LCodeGen::X87Stack& x87_stack)
    457       : codegen_(codegen),
    458         external_exit_(NULL),
    459         instruction_index_(codegen->current_instruction_),
    460         x87_stack_(x87_stack) {
    461     codegen->AddDeferredCode(this);
    462   }
    463 
    464   virtual ~LDeferredCode() {}
    465   virtual void Generate() = 0;
    466   virtual LInstruction* instr() = 0;
    467 
    468   void SetExit(Label* exit) { external_exit_ = exit; }
    469   Label* entry() { return &entry_; }
    470   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
    471   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
    472   int instruction_index() const { return instruction_index_; }
    473   const LCodeGen::X87Stack& x87_stack() const { return x87_stack_; }
    474 
    475  protected:
    476   LCodeGen* codegen() const { return codegen_; }
    477   MacroAssembler* masm() const { return codegen_->masm(); }
    478 
    479  private:
    480   LCodeGen* codegen_;
    481   Label entry_;
    482   Label exit_;
    483   Label* external_exit_;
    484   Label done_;
    485   int instruction_index_;
    486   LCodeGen::X87Stack x87_stack_;
    487 };
    488 
    489 }  // namespace internal
    490 }  // namespace v8
    491 
    492 #endif  // V8_CRANKSHAFT_X87_LITHIUM_CODEGEN_X87_H_
    493