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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #ifndef V8_X64_LITHIUM_CODEGEN_X64_H_
     29 #define V8_X64_LITHIUM_CODEGEN_X64_H_
     30 
     31 #include "x64/lithium-x64.h"
     32 
     33 #include "checks.h"
     34 #include "deoptimizer.h"
     35 #include "safepoint-table.h"
     36 #include "scopes.h"
     37 #include "x64/lithium-gap-resolver-x64.h"
     38 
     39 namespace v8 {
     40 namespace internal {
     41 
     42 // Forward declarations.
     43 class LDeferredCode;
     44 class SafepointGenerator;
     45 
     46 class LCodeGen BASE_EMBEDDED {
     47  public:
     48   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
     49       : chunk_(chunk),
     50         masm_(assembler),
     51         info_(info),
     52         current_block_(-1),
     53         current_instruction_(-1),
     54         instructions_(chunk->instructions()),
     55         deoptimizations_(4),
     56         jump_table_(4),
     57         deoptimization_literals_(8),
     58         inlined_function_count_(0),
     59         scope_(info->scope()),
     60         status_(UNUSED),
     61         deferred_(8),
     62         osr_pc_offset_(-1),
     63         last_lazy_deopt_pc_(0),
     64         resolver_(this),
     65         expected_safepoint_kind_(Safepoint::kSimple) {
     66     PopulateDeoptimizationLiteralsWithInlinedFunctions();
     67   }
     68 
     69   // Simple accessors.
     70   MacroAssembler* masm() const { return masm_; }
     71   CompilationInfo* info() const { return info_; }
     72   Isolate* isolate() const { return info_->isolate(); }
     73   Factory* factory() const { return isolate()->factory(); }
     74   Heap* heap() const { return isolate()->heap(); }
     75 
     76   // Support for converting LOperands to assembler types.
     77   Register ToRegister(LOperand* op) const;
     78   XMMRegister ToDoubleRegister(LOperand* op) const;
     79   bool IsInteger32Constant(LConstantOperand* op) const;
     80   int ToInteger32(LConstantOperand* op) const;
     81   double ToDouble(LConstantOperand* op) const;
     82   bool IsTaggedConstant(LConstantOperand* op) const;
     83   Handle<Object> ToHandle(LConstantOperand* op) const;
     84   Operand ToOperand(LOperand* op) const;
     85 
     86   // Try to generate code for the entire chunk, but it may fail if the
     87   // chunk contains constructs we cannot handle. Returns true if the
     88   // code generation attempt succeeded.
     89   bool GenerateCode();
     90 
     91   // Finish the code by setting stack height, safepoint, and bailout
     92   // information on it.
     93   void FinishCode(Handle<Code> code);
     94 
     95   // Deferred code support.
     96   void DoDeferredNumberTagD(LNumberTagD* instr);
     97   void DoDeferredTaggedToI(LTaggedToI* instr);
     98   void DoDeferredMathAbsTaggedHeapNumber(LUnaryMathOperation* instr);
     99   void DoDeferredStackCheck(LStackCheck* instr);
    100   void DoDeferredRandom(LRandom* instr);
    101   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
    102   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
    103   void DoDeferredAllocateObject(LAllocateObject* instr);
    104   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
    105                                        Label* map_check);
    106 
    107   void DoCheckMapCommon(Register reg, Handle<Map> map,
    108                         CompareMapMode mode, LEnvironment* env);
    109 
    110 // Parallel move support.
    111   void DoParallelMove(LParallelMove* move);
    112   void DoGap(LGap* instr);
    113 
    114   // Emit frame translation commands for an environment.
    115   void WriteTranslation(LEnvironment* environment, Translation* translation);
    116 
    117   // Declare methods that deal with the individual node types.
    118 #define DECLARE_DO(type) void Do##type(L##type* node);
    119   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
    120 #undef DECLARE_DO
    121 
    122  private:
    123   enum Status {
    124     UNUSED,
    125     GENERATING,
    126     DONE,
    127     ABORTED
    128   };
    129 
    130   bool is_unused() const { return status_ == UNUSED; }
    131   bool is_generating() const { return status_ == GENERATING; }
    132   bool is_done() const { return status_ == DONE; }
    133   bool is_aborted() const { return status_ == ABORTED; }
    134 
    135   StrictModeFlag strict_mode_flag() const {
    136     return info()->is_classic_mode() ? kNonStrictMode : kStrictMode;
    137   }
    138 
    139   LChunk* chunk() const { return chunk_; }
    140   Scope* scope() const { return scope_; }
    141   HGraph* graph() const { return chunk_->graph(); }
    142 
    143   int GetNextEmittedBlock(int block);
    144 
    145   void EmitClassOfTest(Label* if_true,
    146                        Label* if_false,
    147                        Handle<String> class_name,
    148                        Register input,
    149                        Register temporary,
    150                        Register scratch);
    151 
    152   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
    153   int GetParameterCount() const { return scope()->num_parameters(); }
    154 
    155   void Abort(const char* format, ...);
    156   void Comment(const char* format, ...);
    157 
    158   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code); }
    159 
    160   // Code generation passes.  Returns true if code generation should
    161   // continue.
    162   bool GeneratePrologue();
    163   bool GenerateBody();
    164   bool GenerateDeferredCode();
    165   bool GenerateJumpTable();
    166   bool GenerateSafepointTable();
    167 
    168   enum SafepointMode {
    169     RECORD_SIMPLE_SAFEPOINT,
    170     RECORD_SAFEPOINT_WITH_REGISTERS
    171   };
    172 
    173   void CallCodeGeneric(Handle<Code> code,
    174                        RelocInfo::Mode mode,
    175                        LInstruction* instr,
    176                        SafepointMode safepoint_mode,
    177                        int argc);
    178 
    179 
    180   void CallCode(Handle<Code> code,
    181                 RelocInfo::Mode mode,
    182                 LInstruction* instr);
    183 
    184   void CallRuntime(const Runtime::Function* function,
    185                    int num_arguments,
    186                    LInstruction* instr);
    187 
    188   void CallRuntime(Runtime::FunctionId id,
    189                    int num_arguments,
    190                    LInstruction* instr) {
    191     const Runtime::Function* function = Runtime::FunctionForId(id);
    192     CallRuntime(function, num_arguments, instr);
    193   }
    194 
    195   void CallRuntimeFromDeferred(Runtime::FunctionId id,
    196                                int argc,
    197                                LInstruction* instr);
    198 
    199   // Generate a direct call to a known function.  Expects the function
    200   // to be in rdi.
    201   void CallKnownFunction(Handle<JSFunction> function,
    202                          int arity,
    203                          LInstruction* instr,
    204                          CallKind call_kind);
    205 
    206 
    207   void RecordSafepointWithLazyDeopt(LInstruction* instr,
    208                                     SafepointMode safepoint_mode,
    209                                     int argc);
    210   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
    211                                             Safepoint::DeoptMode mode);
    212   void DeoptimizeIf(Condition cc, LEnvironment* environment);
    213 
    214   void AddToTranslation(Translation* translation,
    215                         LOperand* op,
    216                         bool is_tagged);
    217   void PopulateDeoptimizationData(Handle<Code> code);
    218   int DefineDeoptimizationLiteral(Handle<Object> literal);
    219 
    220   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
    221 
    222   Register ToRegister(int index) const;
    223   XMMRegister ToDoubleRegister(int index) const;
    224   Operand BuildFastArrayOperand(
    225       LOperand* elements_pointer,
    226       LOperand* key,
    227       ElementsKind elements_kind,
    228       uint32_t offset);
    229 
    230   // Specific math operations - used from DoUnaryMathOperation.
    231   void EmitIntegerMathAbs(LUnaryMathOperation* instr);
    232   void DoMathAbs(LUnaryMathOperation* instr);
    233   void DoMathFloor(LUnaryMathOperation* instr);
    234   void DoMathRound(LUnaryMathOperation* instr);
    235   void DoMathSqrt(LUnaryMathOperation* instr);
    236   void DoMathPowHalf(LUnaryMathOperation* instr);
    237   void DoMathLog(LUnaryMathOperation* instr);
    238   void DoMathTan(LUnaryMathOperation* instr);
    239   void DoMathCos(LUnaryMathOperation* instr);
    240   void DoMathSin(LUnaryMathOperation* instr);
    241 
    242   // Support for recording safepoint and position information.
    243   void RecordSafepoint(LPointerMap* pointers,
    244                        Safepoint::Kind kind,
    245                        int arguments,
    246                        Safepoint::DeoptMode mode);
    247   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
    248   void RecordSafepoint(Safepoint::DeoptMode mode);
    249   void RecordSafepointWithRegisters(LPointerMap* pointers,
    250                                     int arguments,
    251                                     Safepoint::DeoptMode mode);
    252   void RecordPosition(int position);
    253 
    254   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
    255   void EmitGoto(int block);
    256   void EmitBranch(int left_block, int right_block, Condition cc);
    257   void EmitNumberUntagD(Register input,
    258                         XMMRegister result,
    259                         bool deoptimize_on_undefined,
    260                         bool deoptimize_on_minus_zero,
    261                         LEnvironment* env);
    262 
    263   // Emits optimized code for typeof x == "y".  Modifies input register.
    264   // Returns the condition on which a final split to
    265   // true and false label should be made, to optimize fallthrough.
    266   Condition EmitTypeofIs(Label* true_label,
    267                          Label* false_label,
    268                          Register input,
    269                          Handle<String> type_name);
    270 
    271   // Emits optimized code for %_IsObject(x).  Preserves input register.
    272   // Returns the condition on which a final split to
    273   // true and false label should be made, to optimize fallthrough.
    274   Condition EmitIsObject(Register input,
    275                          Label* is_not_object,
    276                          Label* is_object);
    277 
    278   // Emits optimized code for %_IsString(x).  Preserves input register.
    279   // Returns the condition on which a final split to
    280   // true and false label should be made, to optimize fallthrough.
    281   Condition EmitIsString(Register input,
    282                          Register temp1,
    283                          Label* is_not_string);
    284 
    285   // Emits optimized code for %_IsConstructCall().
    286   // Caller should branch on equal condition.
    287   void EmitIsConstructCall(Register temp);
    288 
    289   void EmitLoadFieldOrConstantFunction(Register result,
    290                                        Register object,
    291                                        Handle<Map> type,
    292                                        Handle<String> name);
    293 
    294   // Emits code for pushing either a tagged constant, a (non-double)
    295   // register, or a stack slot operand.
    296   void EmitPushTaggedOperand(LOperand* operand);
    297 
    298   // Emits optimized code to deep-copy the contents of statically known
    299   // object graphs (e.g. object literal boilerplate).
    300   void EmitDeepCopy(Handle<JSObject> object,
    301                     Register result,
    302                     Register source,
    303                     int* offset);
    304 
    305   struct JumpTableEntry {
    306     explicit inline JumpTableEntry(Address entry)
    307         : label(),
    308           address(entry) { }
    309     Label label;
    310     Address address;
    311   };
    312 
    313   void EnsureSpaceForLazyDeopt(int space_needed);
    314 
    315   LChunk* const chunk_;
    316   MacroAssembler* const masm_;
    317   CompilationInfo* const info_;
    318 
    319   int current_block_;
    320   int current_instruction_;
    321   const ZoneList<LInstruction*>* instructions_;
    322   ZoneList<LEnvironment*> deoptimizations_;
    323   ZoneList<JumpTableEntry> jump_table_;
    324   ZoneList<Handle<Object> > deoptimization_literals_;
    325   int inlined_function_count_;
    326   Scope* const scope_;
    327   Status status_;
    328   TranslationBuffer translations_;
    329   ZoneList<LDeferredCode*> deferred_;
    330   int osr_pc_offset_;
    331   int last_lazy_deopt_pc_;
    332 
    333   // Builder that keeps track of safepoints in the code. The table
    334   // itself is emitted at the end of the generated code.
    335   SafepointTableBuilder safepoints_;
    336 
    337   // Compiler from a set of parallel moves to a sequential list of moves.
    338   LGapResolver resolver_;
    339 
    340   Safepoint::Kind expected_safepoint_kind_;
    341 
    342   class PushSafepointRegistersScope BASE_EMBEDDED {
    343    public:
    344     explicit PushSafepointRegistersScope(LCodeGen* codegen)
    345         : codegen_(codegen) {
    346       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
    347       codegen_->masm_->PushSafepointRegisters();
    348       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
    349     }
    350 
    351     ~PushSafepointRegistersScope() {
    352       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
    353       codegen_->masm_->PopSafepointRegisters();
    354       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
    355     }
    356 
    357    private:
    358     LCodeGen* codegen_;
    359   };
    360 
    361   friend class LDeferredCode;
    362   friend class LEnvironment;
    363   friend class SafepointGenerator;
    364   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
    365 };
    366 
    367 
    368 class LDeferredCode: public ZoneObject {
    369  public:
    370   explicit LDeferredCode(LCodeGen* codegen)
    371       : codegen_(codegen),
    372         external_exit_(NULL),
    373         instruction_index_(codegen->current_instruction_) {
    374     codegen->AddDeferredCode(this);
    375   }
    376 
    377   virtual ~LDeferredCode() { }
    378   virtual void Generate() = 0;
    379   virtual LInstruction* instr() = 0;
    380 
    381   void SetExit(Label* exit) { external_exit_ = exit; }
    382   Label* entry() { return &entry_; }
    383   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
    384   int instruction_index() const { return instruction_index_; }
    385 
    386  protected:
    387   LCodeGen* codegen() const { return codegen_; }
    388   MacroAssembler* masm() const { return codegen_->masm(); }
    389 
    390  private:
    391   LCodeGen* codegen_;
    392   Label entry_;
    393   Label exit_;
    394   Label* external_exit_;
    395   int instruction_index_;
    396 };
    397 
    398 } }  // namespace v8::internal
    399 
    400 #endif  // V8_X64_LITHIUM_CODEGEN_X64_H_
    401