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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_X87_LITHIUM_CODEGEN_X87_H_
      6 #define V8_X87_LITHIUM_CODEGEN_X87_H_
      7 
      8 #include <map>
      9 #include "src/x87/lithium-x87.h"
     10 
     11 #include "src/base/logging.h"
     12 #include "src/deoptimizer.h"
     13 #include "src/lithium-codegen.h"
     14 #include "src/safepoint-table.h"
     15 #include "src/scopes.h"
     16 #include "src/utils.h"
     17 #include "src/x87/lithium-gap-resolver-x87.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         deoptimizations_(4, info->zone()),
     32         jump_table_(4, info->zone()),
     33         deoptimization_literals_(8, info->zone()),
     34         inlined_function_count_(0),
     35         scope_(info->scope()),
     36         translations_(info->zone()),
     37         deferred_(8, info->zone()),
     38         dynamic_frame_alignment_(false),
     39         support_aligned_spilled_doubles_(false),
     40         osr_pc_offset_(-1),
     41         frame_is_built_(false),
     42         x87_stack_(assembler),
     43         safepoints_(info->zone()),
     44         resolver_(this),
     45         expected_safepoint_kind_(Safepoint::kSimple) {
     46     PopulateDeoptimizationLiteralsWithInlinedFunctions();
     47   }
     48 
     49   int LookupDestination(int block_id) const {
     50     return chunk()->LookupDestination(block_id);
     51   }
     52 
     53   bool IsNextEmittedBlock(int block_id) const {
     54     return LookupDestination(block_id) == GetNextEmittedBlock();
     55   }
     56 
     57   bool NeedsEagerFrame() const {
     58     return GetStackSlotCount() > 0 ||
     59         info()->is_non_deferred_calling() ||
     60         !info()->IsStub() ||
     61         info()->requires_frame();
     62   }
     63   bool NeedsDeferredFrame() const {
     64     return !NeedsEagerFrame() && info()->is_deferred_calling();
     65   }
     66 
     67   // Support for converting LOperands to assembler types.
     68   Operand ToOperand(LOperand* op) const;
     69   Register ToRegister(LOperand* op) const;
     70   X87Register ToX87Register(LOperand* op) const;
     71 
     72   bool IsInteger32(LConstantOperand* op) const;
     73   bool IsSmi(LConstantOperand* op) const;
     74   Immediate ToImmediate(LOperand* op, const Representation& r) const {
     75     return Immediate(ToRepresentation(LConstantOperand::cast(op), r));
     76   }
     77   double ToDouble(LConstantOperand* op) const;
     78 
     79   // Support for non-sse2 (x87) floating point stack handling.
     80   // These functions maintain the mapping of physical stack registers to our
     81   // virtual registers between instructions.
     82   enum X87OperandType { kX87DoubleOperand, kX87FloatOperand, kX87IntOperand };
     83 
     84   void X87Mov(X87Register reg, Operand src,
     85       X87OperandType operand = kX87DoubleOperand);
     86   void X87Mov(Operand src, X87Register reg,
     87       X87OperandType operand = kX87DoubleOperand);
     88   void X87Mov(X87Register reg, X87Register src,
     89               X87OperandType operand = kX87DoubleOperand);
     90 
     91   void X87PrepareBinaryOp(
     92       X87Register left, X87Register right, X87Register result);
     93 
     94   void X87LoadForUsage(X87Register reg);
     95   void X87LoadForUsage(X87Register reg1, X87Register reg2);
     96   void X87PrepareToWrite(X87Register reg) { x87_stack_.PrepareToWrite(reg); }
     97   void X87CommitWrite(X87Register reg) { x87_stack_.CommitWrite(reg); }
     98 
     99   void X87Fxch(X87Register reg, int other_slot = 0) {
    100     x87_stack_.Fxch(reg, other_slot);
    101   }
    102   void X87Free(X87Register reg) {
    103     x87_stack_.Free(reg);
    104   }
    105 
    106 
    107   bool X87StackEmpty() {
    108     return x87_stack_.depth() == 0;
    109   }
    110 
    111   Handle<Object> ToHandle(LConstantOperand* op) const;
    112 
    113   // The operand denoting the second word (the one with a higher address) of
    114   // a double stack slot.
    115   Operand HighOperand(LOperand* op);
    116 
    117   // Try to generate code for the entire chunk, but it may fail if the
    118   // chunk contains constructs we cannot handle. Returns true if the
    119   // code generation attempt succeeded.
    120   bool GenerateCode();
    121 
    122   // Finish the code by setting stack height, safepoint, and bailout
    123   // information on it.
    124   void FinishCode(Handle<Code> code);
    125 
    126   // Deferred code support.
    127   void DoDeferredNumberTagD(LNumberTagD* instr);
    128 
    129   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
    130   void DoDeferredNumberTagIU(LInstruction* instr,
    131                              LOperand* value,
    132                              LOperand* temp,
    133                              IntegerSignedness signedness);
    134 
    135   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
    136   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
    137   void DoDeferredStackCheck(LStackCheck* instr);
    138   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
    139   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
    140   void DoDeferredAllocate(LAllocate* instr);
    141   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
    142                                        Label* map_check);
    143   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
    144   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
    145                                    Register object,
    146                                    Register index);
    147 
    148   // Parallel move support.
    149   void DoParallelMove(LParallelMove* move);
    150   void DoGap(LGap* instr);
    151 
    152   // Emit frame translation commands for an environment.
    153   void WriteTranslation(LEnvironment* environment, Translation* translation);
    154 
    155   void EnsureRelocSpaceForDeoptimization();
    156 
    157   // Declare methods that deal with the individual node types.
    158 #define DECLARE_DO(type) void Do##type(L##type* node);
    159   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
    160 #undef DECLARE_DO
    161 
    162  private:
    163   StrictMode strict_mode() const { return info()->strict_mode(); }
    164 
    165   Scope* scope() const { return scope_; }
    166 
    167   void EmitClassOfTest(Label* if_true,
    168                        Label* if_false,
    169                        Handle<String> class_name,
    170                        Register input,
    171                        Register temporary,
    172                        Register temporary2);
    173 
    174   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
    175 
    176   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
    177 
    178   // Code generation passes.  Returns true if code generation should
    179   // continue.
    180   void GenerateBodyInstructionPre(LInstruction* instr) OVERRIDE;
    181   void GenerateBodyInstructionPost(LInstruction* instr) OVERRIDE;
    182   bool GeneratePrologue();
    183   bool GenerateDeferredCode();
    184   bool GenerateJumpTable();
    185   bool GenerateSafepointTable();
    186 
    187   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
    188   void GenerateOsrPrologue();
    189 
    190   enum SafepointMode {
    191     RECORD_SIMPLE_SAFEPOINT,
    192     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
    193   };
    194 
    195   void CallCode(Handle<Code> code,
    196                 RelocInfo::Mode mode,
    197                 LInstruction* instr);
    198 
    199   void CallCodeGeneric(Handle<Code> code,
    200                        RelocInfo::Mode mode,
    201                        LInstruction* instr,
    202                        SafepointMode safepoint_mode);
    203 
    204   void CallRuntime(const Runtime::Function* fun, int argc, LInstruction* instr,
    205                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
    206 
    207   void CallRuntime(Runtime::FunctionId id,
    208                    int argc,
    209                    LInstruction* instr) {
    210     const Runtime::Function* function = Runtime::FunctionForId(id);
    211     CallRuntime(function, argc, instr);
    212   }
    213 
    214   void CallRuntimeFromDeferred(Runtime::FunctionId id,
    215                                int argc,
    216                                LInstruction* instr,
    217                                LOperand* context);
    218 
    219   void LoadContextFromDeferred(LOperand* context);
    220 
    221   enum EDIState {
    222     EDI_UNINITIALIZED,
    223     EDI_CONTAINS_TARGET
    224   };
    225 
    226   // Generate a direct call to a known function.  Expects the function
    227   // to be in edi.
    228   void CallKnownFunction(Handle<JSFunction> function,
    229                          int formal_parameter_count,
    230                          int arity,
    231                          LInstruction* instr,
    232                          EDIState edi_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 cc, LInstruction* instr, const char* detail,
    240                     Deoptimizer::BailoutType bailout_type);
    241   void DeoptimizeIf(Condition cc, LInstruction* instr, const char* detail);
    242 
    243   bool DeoptEveryNTimes() {
    244     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
    245   }
    246 
    247   void AddToTranslation(LEnvironment* environment,
    248                         Translation* translation,
    249                         LOperand* op,
    250                         bool is_tagged,
    251                         bool is_uint32,
    252                         int* object_index_pointer,
    253                         int* dematerialized_index_pointer);
    254   void PopulateDeoptimizationData(Handle<Code> code);
    255   int DefineDeoptimizationLiteral(Handle<Object> literal);
    256 
    257   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
    258 
    259   Register ToRegister(int index) const;
    260   X87Register ToX87Register(int index) const;
    261   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
    262   int32_t ToInteger32(LConstantOperand* op) const;
    263   ExternalReference ToExternalReference(LConstantOperand* op) const;
    264 
    265   Operand BuildFastArrayOperand(LOperand* elements_pointer,
    266                                 LOperand* key,
    267                                 Representation key_representation,
    268                                 ElementsKind elements_kind,
    269                                 uint32_t base_offset);
    270 
    271   Operand BuildSeqStringOperand(Register string,
    272                                 LOperand* index,
    273                                 String::Encoding encoding);
    274 
    275   void EmitIntegerMathAbs(LMathAbs* instr);
    276 
    277   // Support for recording safepoint and position information.
    278   void RecordSafepoint(LPointerMap* pointers,
    279                        Safepoint::Kind kind,
    280                        int arguments,
    281                        Safepoint::DeoptMode mode);
    282   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
    283   void RecordSafepoint(Safepoint::DeoptMode mode);
    284   void RecordSafepointWithRegisters(LPointerMap* pointers,
    285                                     int arguments,
    286                                     Safepoint::DeoptMode mode);
    287 
    288   void RecordAndWritePosition(int position) OVERRIDE;
    289 
    290   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
    291   void EmitGoto(int block);
    292 
    293   // EmitBranch expects to be the last instruction of a block.
    294   template<class InstrType>
    295   void EmitBranch(InstrType instr, Condition cc);
    296   template<class InstrType>
    297   void EmitFalseBranch(InstrType instr, Condition cc);
    298   void EmitNumberUntagDNoSSE2(LNumberUntagD* instr, Register input,
    299                               Register temp, X87Register res_reg,
    300                               NumberUntagDMode mode);
    301 
    302   // Emits optimized code for typeof x == "y".  Modifies input register.
    303   // Returns the condition on which a final split to
    304   // true and false label should be made, to optimize fallthrough.
    305   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
    306 
    307   // Emits optimized code for %_IsObject(x).  Preserves input register.
    308   // Returns the condition on which a final split to
    309   // true and false label should be made, to optimize fallthrough.
    310   Condition EmitIsObject(Register input,
    311                          Register temp1,
    312                          Label* is_not_object,
    313                          Label* is_object);
    314 
    315   // Emits optimized code for %_IsString(x).  Preserves input register.
    316   // Returns the condition on which a final split to
    317   // true and false label should be made, to optimize fallthrough.
    318   Condition EmitIsString(Register input,
    319                          Register temp1,
    320                          Label* is_not_string,
    321                          SmiCheck check_needed);
    322 
    323   // Emits optimized code for %_IsConstructCall().
    324   // Caller should branch on equal condition.
    325   void EmitIsConstructCall(Register temp);
    326 
    327   // Emits optimized code to deep-copy the contents of statically known
    328   // object graphs (e.g. object literal boilerplate).
    329   void EmitDeepCopy(Handle<JSObject> object,
    330                     Register result,
    331                     Register source,
    332                     int* offset,
    333                     AllocationSiteMode mode);
    334 
    335   void EnsureSpaceForLazyDeopt(int space_needed) OVERRIDE;
    336   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
    337   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
    338   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
    339   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
    340   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
    341   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
    342 
    343   template <class T>
    344   void EmitVectorLoadICRegisters(T* instr);
    345 
    346   void EmitReturn(LReturn* instr, bool dynamic_frame_alignment);
    347 
    348   // Emits code for pushing either a tagged constant, a (non-double)
    349   // register, or a stack slot operand.
    350   void EmitPushTaggedOperand(LOperand* operand);
    351 
    352   void X87Fld(Operand src, X87OperandType opts);
    353 
    354   void EmitFlushX87ForDeopt();
    355   void FlushX87StackIfNecessary(LInstruction* instr) {
    356     x87_stack_.FlushIfNecessary(instr, this);
    357   }
    358   friend class LGapResolver;
    359 
    360 #ifdef _MSC_VER
    361   // On windows, you may not access the stack more than one page below
    362   // the most recently mapped page. To make the allocated area randomly
    363   // accessible, we write an arbitrary value to each page in range
    364   // esp + offset - page_size .. esp in turn.
    365   void MakeSureStackPagesMapped(int offset);
    366 #endif
    367 
    368   ZoneList<LEnvironment*> deoptimizations_;
    369   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
    370   ZoneList<Handle<Object> > deoptimization_literals_;
    371   int inlined_function_count_;
    372   Scope* const scope_;
    373   TranslationBuffer translations_;
    374   ZoneList<LDeferredCode*> deferred_;
    375   bool dynamic_frame_alignment_;
    376   bool support_aligned_spilled_doubles_;
    377   int osr_pc_offset_;
    378   bool frame_is_built_;
    379 
    380   class X87Stack : public ZoneObject {
    381    public:
    382     explicit X87Stack(MacroAssembler* masm)
    383         : stack_depth_(0), is_mutable_(true), masm_(masm) { }
    384     explicit X87Stack(const X87Stack& other)
    385         : stack_depth_(other.stack_depth_), is_mutable_(false), masm_(masm()) {
    386       for (int i = 0; i < stack_depth_; i++) {
    387         stack_[i] = other.stack_[i];
    388       }
    389     }
    390     bool operator==(const X87Stack& other) const {
    391       if (stack_depth_ != other.stack_depth_) return false;
    392       for (int i = 0; i < stack_depth_; i++) {
    393         if (!stack_[i].is(other.stack_[i])) return false;
    394       }
    395       return true;
    396     }
    397     X87Stack& operator=(const X87Stack& other) {
    398       stack_depth_ = other.stack_depth_;
    399       for (int i = 0; i < stack_depth_; i++) {
    400         stack_[i] = other.stack_[i];
    401       }
    402       return *this;
    403     }
    404     bool Contains(X87Register reg);
    405     void Fxch(X87Register reg, int other_slot = 0);
    406     void Free(X87Register reg);
    407     void PrepareToWrite(X87Register reg);
    408     void CommitWrite(X87Register reg);
    409     void FlushIfNecessary(LInstruction* instr, LCodeGen* cgen);
    410     void LeavingBlock(int current_block_id, LGoto* goto_instr, LCodeGen* cgen);
    411     int depth() const { return stack_depth_; }
    412     int GetLayout();
    413     int st(X87Register reg) { return st2idx(ArrayIndex(reg)); }
    414     void pop() {
    415       DCHECK(is_mutable_);
    416       stack_depth_--;
    417     }
    418     void push(X87Register reg) {
    419       DCHECK(is_mutable_);
    420       DCHECK(stack_depth_ < X87Register::kMaxNumAllocatableRegisters);
    421       stack_[stack_depth_] = reg;
    422       stack_depth_++;
    423     }
    424 
    425     MacroAssembler* masm() const { return masm_; }
    426     Isolate* isolate() const { return masm_->isolate(); }
    427 
    428    private:
    429     int ArrayIndex(X87Register reg);
    430     int st2idx(int pos);
    431 
    432     X87Register stack_[X87Register::kMaxNumAllocatableRegisters];
    433     int stack_depth_;
    434     bool is_mutable_;
    435     MacroAssembler* masm_;
    436   };
    437   X87Stack x87_stack_;
    438   // block_id -> X87Stack*;
    439   typedef std::map<int, X87Stack*> X87StackMap;
    440   X87StackMap x87_stack_map_;
    441 
    442   // Builder that keeps track of safepoints in the code. The table
    443   // itself is emitted at the end of the generated code.
    444   SafepointTableBuilder safepoints_;
    445 
    446   // Compiler from a set of parallel moves to a sequential list of moves.
    447   LGapResolver resolver_;
    448 
    449   Safepoint::Kind expected_safepoint_kind_;
    450 
    451   class PushSafepointRegistersScope FINAL  BASE_EMBEDDED {
    452    public:
    453     explicit PushSafepointRegistersScope(LCodeGen* codegen)
    454         : codegen_(codegen) {
    455       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
    456       codegen_->masm_->PushSafepointRegisters();
    457       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
    458       DCHECK(codegen_->info()->is_calling());
    459     }
    460 
    461     ~PushSafepointRegistersScope() {
    462       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
    463       codegen_->masm_->PopSafepointRegisters();
    464       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
    465     }
    466 
    467    private:
    468     LCodeGen* codegen_;
    469   };
    470 
    471   friend class LDeferredCode;
    472   friend class LEnvironment;
    473   friend class SafepointGenerator;
    474   friend class X87Stack;
    475   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
    476 };
    477 
    478 
    479 class LDeferredCode : public ZoneObject {
    480  public:
    481   explicit LDeferredCode(LCodeGen* codegen, const LCodeGen::X87Stack& x87_stack)
    482       : codegen_(codegen),
    483         external_exit_(NULL),
    484         instruction_index_(codegen->current_instruction_),
    485         x87_stack_(x87_stack) {
    486     codegen->AddDeferredCode(this);
    487   }
    488 
    489   virtual ~LDeferredCode() {}
    490   virtual void Generate() = 0;
    491   virtual LInstruction* instr() = 0;
    492 
    493   void SetExit(Label* exit) { external_exit_ = exit; }
    494   Label* entry() { return &entry_; }
    495   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
    496   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
    497   int instruction_index() const { return instruction_index_; }
    498   const LCodeGen::X87Stack& x87_stack() const { return x87_stack_; }
    499 
    500  protected:
    501   LCodeGen* codegen() const { return codegen_; }
    502   MacroAssembler* masm() const { return codegen_->masm(); }
    503 
    504  private:
    505   LCodeGen* codegen_;
    506   Label entry_;
    507   Label exit_;
    508   Label* external_exit_;
    509   Label done_;
    510   int instruction_index_;
    511   LCodeGen::X87Stack x87_stack_;
    512 };
    513 
    514 } }  // namespace v8::internal
    515 
    516 #endif  // V8_X87_LITHIUM_CODEGEN_X87_H_
    517