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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         dynamic_frame_alignment_(false),
     35         support_aligned_spilled_doubles_(false),
     36         frame_is_built_(false),
     37         x87_stack_(assembler),
     38         safepoints_(info->zone()),
     39         resolver_(this),
     40         expected_safepoint_kind_(Safepoint::kSimple) {
     41     PopulateDeoptimizationLiteralsWithInlinedFunctions();
     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   // Support for converting LOperands to assembler types.
     63   Operand ToOperand(LOperand* op) const;
     64   Register ToRegister(LOperand* op) const;
     65   X87Register ToX87Register(LOperand* op) const;
     66 
     67   bool IsInteger32(LConstantOperand* op) const;
     68   bool IsSmi(LConstantOperand* op) const;
     69   Immediate ToImmediate(LOperand* op, const Representation& r) const {
     70     return Immediate(ToRepresentation(LConstantOperand::cast(op), r));
     71   }
     72   double ToDouble(LConstantOperand* op) const;
     73 
     74   // Support for non-sse2 (x87) floating point stack handling.
     75   // These functions maintain the mapping of physical stack registers to our
     76   // virtual registers between instructions.
     77   enum X87OperandType { kX87DoubleOperand, kX87FloatOperand, kX87IntOperand };
     78 
     79   void X87Mov(X87Register reg, Operand src,
     80       X87OperandType operand = kX87DoubleOperand);
     81   void X87Mov(Operand src, X87Register reg,
     82       X87OperandType operand = kX87DoubleOperand);
     83   void X87Mov(X87Register reg, X87Register src,
     84               X87OperandType operand = kX87DoubleOperand);
     85 
     86   void X87PrepareBinaryOp(
     87       X87Register left, X87Register right, X87Register result);
     88 
     89   void X87LoadForUsage(X87Register reg);
     90   void X87LoadForUsage(X87Register reg1, X87Register reg2);
     91   void X87PrepareToWrite(X87Register reg) { x87_stack_.PrepareToWrite(reg); }
     92   void X87CommitWrite(X87Register reg) { x87_stack_.CommitWrite(reg); }
     93 
     94   void X87Fxch(X87Register reg, int other_slot = 0) {
     95     x87_stack_.Fxch(reg, other_slot);
     96   }
     97   void X87Free(X87Register reg) {
     98     x87_stack_.Free(reg);
     99   }
    100 
    101 
    102   bool X87StackEmpty() {
    103     return x87_stack_.depth() == 0;
    104   }
    105 
    106   Handle<Object> ToHandle(LConstantOperand* op) const;
    107 
    108   // The operand denoting the second word (the one with a higher address) of
    109   // a double stack slot.
    110   Operand HighOperand(LOperand* op);
    111 
    112   // Try to generate code for the entire chunk, but it may fail if the
    113   // chunk contains constructs we cannot handle. Returns true if the
    114   // code generation attempt succeeded.
    115   bool GenerateCode();
    116 
    117   // Finish the code by setting stack height, safepoint, and bailout
    118   // information on it.
    119   void FinishCode(Handle<Code> code);
    120 
    121   // Deferred code support.
    122   void DoDeferredNumberTagD(LNumberTagD* instr);
    123 
    124   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
    125   void DoDeferredNumberTagIU(LInstruction* instr,
    126                              LOperand* value,
    127                              LOperand* temp,
    128                              IntegerSignedness signedness);
    129 
    130   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
    131   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
    132   void DoDeferredStackCheck(LStackCheck* instr);
    133   void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
    134   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
    135   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
    136   void DoDeferredAllocate(LAllocate* instr);
    137   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
    138   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
    139                                    Register object,
    140                                    Register index);
    141 
    142   // Parallel move support.
    143   void DoParallelMove(LParallelMove* move);
    144   void DoGap(LGap* instr);
    145 
    146   // Emit frame translation commands for an environment.
    147   void WriteTranslation(LEnvironment* environment, Translation* translation);
    148 
    149   void EnsureRelocSpaceForDeoptimization();
    150 
    151   // Declare methods that deal with the individual node types.
    152 #define DECLARE_DO(type) void Do##type(L##type* node);
    153   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
    154 #undef DECLARE_DO
    155 
    156  private:
    157   LanguageMode language_mode() const { return info()->language_mode(); }
    158 
    159   Scope* scope() const { return scope_; }
    160 
    161   void EmitClassOfTest(Label* if_true,
    162                        Label* if_false,
    163                        Handle<String> class_name,
    164                        Register input,
    165                        Register temporary,
    166                        Register temporary2);
    167 
    168   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
    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   // Generate a direct call to a known function.  Expects the function
    221   // to be in edi.
    222   void CallKnownFunction(Handle<JSFunction> function,
    223                          int formal_parameter_count, int arity,
    224                          LInstruction* instr);
    225 
    226   void RecordSafepointWithLazyDeopt(LInstruction* instr,
    227                                     SafepointMode safepoint_mode);
    228 
    229   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
    230                                             Safepoint::DeoptMode mode);
    231   void DeoptimizeIf(Condition cc, LInstruction* instr,
    232                     Deoptimizer::DeoptReason deopt_reason,
    233                     Deoptimizer::BailoutType bailout_type);
    234   void DeoptimizeIf(Condition cc, LInstruction* instr,
    235                     Deoptimizer::DeoptReason deopt_reason);
    236 
    237   bool DeoptEveryNTimes() {
    238     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
    239   }
    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 
    249   Register ToRegister(int index) const;
    250   X87Register ToX87Register(int index) const;
    251   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
    252   int32_t ToInteger32(LConstantOperand* op) const;
    253   ExternalReference ToExternalReference(LConstantOperand* op) const;
    254 
    255   Operand BuildFastArrayOperand(LOperand* elements_pointer,
    256                                 LOperand* key,
    257                                 Representation key_representation,
    258                                 ElementsKind elements_kind,
    259                                 uint32_t base_offset);
    260 
    261   Operand BuildSeqStringOperand(Register string,
    262                                 LOperand* index,
    263                                 String::Encoding encoding);
    264 
    265   void EmitIntegerMathAbs(LMathAbs* instr);
    266 
    267   // Support for recording safepoint and position information.
    268   void RecordSafepoint(LPointerMap* pointers,
    269                        Safepoint::Kind kind,
    270                        int arguments,
    271                        Safepoint::DeoptMode mode);
    272   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
    273   void RecordSafepoint(Safepoint::DeoptMode mode);
    274   void RecordSafepointWithRegisters(LPointerMap* pointers,
    275                                     int arguments,
    276                                     Safepoint::DeoptMode mode);
    277 
    278   void RecordAndWritePosition(int position) override;
    279 
    280   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
    281   void EmitGoto(int block);
    282 
    283   // EmitBranch expects to be the last instruction of a block.
    284   template<class InstrType>
    285   void EmitBranch(InstrType instr, Condition cc);
    286   template <class InstrType>
    287   void EmitTrueBranch(InstrType instr, Condition cc);
    288   template <class InstrType>
    289   void EmitFalseBranch(InstrType instr, Condition cc);
    290   void EmitNumberUntagDNoSSE2(LNumberUntagD* instr, Register input,
    291                               Register temp, X87Register res_reg,
    292                               NumberUntagDMode mode);
    293 
    294   // Emits optimized code for typeof x == "y".  Modifies input register.
    295   // Returns the condition on which a final split to
    296   // true and false label should be made, to optimize fallthrough.
    297   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
    298 
    299   // Emits optimized code for %_IsString(x).  Preserves input register.
    300   // Returns the condition on which a final split to
    301   // true and false label should be made, to optimize fallthrough.
    302   Condition EmitIsString(Register input,
    303                          Register temp1,
    304                          Label* is_not_string,
    305                          SmiCheck check_needed);
    306 
    307   // Emits optimized code to deep-copy the contents of statically known
    308   // object graphs (e.g. object literal boilerplate).
    309   void EmitDeepCopy(Handle<JSObject> object,
    310                     Register result,
    311                     Register source,
    312                     int* offset,
    313                     AllocationSiteMode mode);
    314 
    315   void EnsureSpaceForLazyDeopt(int space_needed) override;
    316   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
    317   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
    318   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
    319   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
    320   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
    321   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
    322 
    323   template <class T>
    324   void EmitVectorLoadICRegisters(T* instr);
    325   template <class T>
    326   void EmitVectorStoreICRegisters(T* instr);
    327 
    328   void EmitReturn(LReturn* instr, bool dynamic_frame_alignment);
    329 
    330   // Emits code for pushing either a tagged constant, a (non-double)
    331   // register, or a stack slot operand.
    332   void EmitPushTaggedOperand(LOperand* operand);
    333 
    334   void X87Fld(Operand src, X87OperandType opts);
    335 
    336   void EmitFlushX87ForDeopt();
    337   void FlushX87StackIfNecessary(LInstruction* instr) {
    338     x87_stack_.FlushIfNecessary(instr, this);
    339   }
    340   friend class LGapResolver;
    341 
    342 #ifdef _MSC_VER
    343   // On windows, you may not access the stack more than one page below
    344   // the most recently mapped page. To make the allocated area randomly
    345   // accessible, we write an arbitrary value to each page in range
    346   // esp + offset - page_size .. esp in turn.
    347   void MakeSureStackPagesMapped(int offset);
    348 #endif
    349 
    350   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
    351   Scope* const scope_;
    352   ZoneList<LDeferredCode*> deferred_;
    353   bool dynamic_frame_alignment_;
    354   bool support_aligned_spilled_doubles_;
    355   bool frame_is_built_;
    356 
    357   class X87Stack : public ZoneObject {
    358    public:
    359     explicit X87Stack(MacroAssembler* masm)
    360         : stack_depth_(0), is_mutable_(true), masm_(masm) { }
    361     explicit X87Stack(const X87Stack& other)
    362         : stack_depth_(other.stack_depth_), is_mutable_(false), masm_(masm()) {
    363       for (int i = 0; i < stack_depth_; i++) {
    364         stack_[i] = other.stack_[i];
    365       }
    366     }
    367     bool operator==(const X87Stack& other) const {
    368       if (stack_depth_ != other.stack_depth_) return false;
    369       for (int i = 0; i < stack_depth_; i++) {
    370         if (!stack_[i].is(other.stack_[i])) return false;
    371       }
    372       return true;
    373     }
    374     X87Stack& operator=(const X87Stack& other) {
    375       stack_depth_ = other.stack_depth_;
    376       for (int i = 0; i < stack_depth_; i++) {
    377         stack_[i] = other.stack_[i];
    378       }
    379       return *this;
    380     }
    381     bool Contains(X87Register reg);
    382     void Fxch(X87Register reg, int other_slot = 0);
    383     void Free(X87Register reg);
    384     void PrepareToWrite(X87Register reg);
    385     void CommitWrite(X87Register reg);
    386     void FlushIfNecessary(LInstruction* instr, LCodeGen* cgen);
    387     void LeavingBlock(int current_block_id, LGoto* goto_instr, LCodeGen* cgen);
    388     int depth() const { return stack_depth_; }
    389     int GetLayout();
    390     int st(X87Register reg) { return st2idx(ArrayIndex(reg)); }
    391     void pop() {
    392       DCHECK(is_mutable_);
    393       USE(is_mutable_);
    394       stack_depth_--;
    395     }
    396     void push(X87Register reg) {
    397       DCHECK(is_mutable_);
    398       DCHECK(stack_depth_ < X87Register::kMaxNumAllocatableRegisters);
    399       stack_[stack_depth_] = reg;
    400       stack_depth_++;
    401     }
    402 
    403     MacroAssembler* masm() const { return masm_; }
    404     Isolate* isolate() const { return masm_->isolate(); }
    405 
    406    private:
    407     int ArrayIndex(X87Register reg);
    408     int st2idx(int pos);
    409 
    410     X87Register stack_[X87Register::kMaxNumAllocatableRegisters];
    411     int stack_depth_;
    412     bool is_mutable_;
    413     MacroAssembler* masm_;
    414   };
    415   X87Stack x87_stack_;
    416   // block_id -> X87Stack*;
    417   typedef std::map<int, X87Stack*> X87StackMap;
    418   X87StackMap x87_stack_map_;
    419 
    420   // Builder that keeps track of safepoints in the code. The table
    421   // itself is emitted at the end of the generated code.
    422   SafepointTableBuilder safepoints_;
    423 
    424   // Compiler from a set of parallel moves to a sequential list of moves.
    425   LGapResolver resolver_;
    426 
    427   Safepoint::Kind expected_safepoint_kind_;
    428 
    429   class PushSafepointRegistersScope final BASE_EMBEDDED {
    430    public:
    431     explicit PushSafepointRegistersScope(LCodeGen* codegen)
    432         : codegen_(codegen) {
    433       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
    434       codegen_->masm_->PushSafepointRegisters();
    435       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
    436       DCHECK(codegen_->info()->is_calling());
    437     }
    438 
    439     ~PushSafepointRegistersScope() {
    440       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
    441       codegen_->masm_->PopSafepointRegisters();
    442       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
    443     }
    444 
    445    private:
    446     LCodeGen* codegen_;
    447   };
    448 
    449   friend class LDeferredCode;
    450   friend class LEnvironment;
    451   friend class SafepointGenerator;
    452   friend class X87Stack;
    453   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
    454 };
    455 
    456 
    457 class LDeferredCode : public ZoneObject {
    458  public:
    459   explicit LDeferredCode(LCodeGen* codegen, const LCodeGen::X87Stack& x87_stack)
    460       : codegen_(codegen),
    461         external_exit_(NULL),
    462         instruction_index_(codegen->current_instruction_),
    463         x87_stack_(x87_stack) {
    464     codegen->AddDeferredCode(this);
    465   }
    466 
    467   virtual ~LDeferredCode() {}
    468   virtual void Generate() = 0;
    469   virtual LInstruction* instr() = 0;
    470 
    471   void SetExit(Label* exit) { external_exit_ = exit; }
    472   Label* entry() { return &entry_; }
    473   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
    474   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
    475   int instruction_index() const { return instruction_index_; }
    476   const LCodeGen::X87Stack& x87_stack() const { return x87_stack_; }
    477 
    478  protected:
    479   LCodeGen* codegen() const { return codegen_; }
    480   MacroAssembler* masm() const { return codegen_->masm(); }
    481 
    482  private:
    483   LCodeGen* codegen_;
    484   Label entry_;
    485   Label exit_;
    486   Label* external_exit_;
    487   Label done_;
    488   int instruction_index_;
    489   LCodeGen::X87Stack x87_stack_;
    490 };
    491 
    492 }  // namespace internal
    493 }  // namespace v8
    494 
    495 #endif  // V8_CRANKSHAFT_X87_LITHIUM_CODEGEN_X87_H_
    496