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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_CODEGEN_H_
      6 #define V8_CODEGEN_H_
      7 
      8 #include "src/code-stubs.h"
      9 #include "src/runtime.h"
     10 
     11 // Include the declaration of the architecture defined class CodeGenerator.
     12 // The contract  to the shared code is that the the CodeGenerator is a subclass
     13 // of Visitor and that the following methods are available publicly:
     14 //   MakeCode
     15 //   MakeCodePrologue
     16 //   MakeCodeEpilogue
     17 //   masm
     18 //   frame
     19 //   script
     20 //   has_valid_frame
     21 //   SetFrame
     22 //   DeleteFrame
     23 //   allocator
     24 //   AddDeferred
     25 //   in_spilled_code
     26 //   set_in_spilled_code
     27 //   RecordPositions
     28 //
     29 // These methods are either used privately by the shared code or implemented as
     30 // shared code:
     31 //   CodeGenerator
     32 //   ~CodeGenerator
     33 //   Generate
     34 //   ComputeLazyCompile
     35 //   BuildFunctionInfo
     36 //   ProcessDeclarations
     37 //   DeclareGlobals
     38 //   CheckForInlineRuntimeCall
     39 //   AnalyzeCondition
     40 //   CodeForFunctionPosition
     41 //   CodeForReturnPosition
     42 //   CodeForStatementPosition
     43 //   CodeForDoWhileConditionPosition
     44 //   CodeForSourcePosition
     45 
     46 enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
     47 
     48 #if V8_TARGET_ARCH_IA32
     49 #include "src/ia32/codegen-ia32.h"
     50 #elif V8_TARGET_ARCH_X64
     51 #include "src/x64/codegen-x64.h"
     52 #elif V8_TARGET_ARCH_ARM64
     53 #include "src/arm64/codegen-arm64.h"
     54 #elif V8_TARGET_ARCH_ARM
     55 #include "src/arm/codegen-arm.h"
     56 #elif V8_TARGET_ARCH_MIPS
     57 #include "src/mips/codegen-mips.h"
     58 #elif V8_TARGET_ARCH_X87
     59 #include "src/x87/codegen-x87.h"
     60 #else
     61 #error Unsupported target architecture.
     62 #endif
     63 
     64 namespace v8 {
     65 namespace internal {
     66 
     67 
     68 class CompilationInfo;
     69 
     70 
     71 class CodeGenerator {
     72  public:
     73   // Printing of AST, etc. as requested by flags.
     74   static void MakeCodePrologue(CompilationInfo* info, const char* kind);
     75 
     76   // Allocate and install the code.
     77   static Handle<Code> MakeCodeEpilogue(MacroAssembler* masm,
     78                                        Code::Flags flags,
     79                                        CompilationInfo* info);
     80 
     81   // Print the code after compiling it.
     82   static void PrintCode(Handle<Code> code, CompilationInfo* info);
     83 
     84   static bool RecordPositions(MacroAssembler* masm,
     85                               int pos,
     86                               bool right_here = false);
     87 
     88  private:
     89   DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
     90 };
     91 
     92 
     93 // Results of the library implementation of transcendental functions may differ
     94 // from the one we use in our generated code.  Therefore we use the same
     95 // generated code both in runtime and compiled code.
     96 typedef double (*UnaryMathFunction)(double x);
     97 
     98 UnaryMathFunction CreateExpFunction();
     99 UnaryMathFunction CreateSqrtFunction();
    100 
    101 
    102 double modulo(double x, double y);
    103 
    104 // Custom implementation of math functions.
    105 double fast_exp(double input);
    106 double fast_sqrt(double input);
    107 #ifdef _WIN64
    108 void init_modulo_function();
    109 #endif
    110 void lazily_initialize_fast_exp();
    111 void init_fast_sqrt_function();
    112 
    113 
    114 class ElementsTransitionGenerator : public AllStatic {
    115  public:
    116   // If |mode| is set to DONT_TRACK_ALLOCATION_SITE,
    117   // |allocation_memento_found| may be NULL.
    118   static void GenerateMapChangeElementsTransition(MacroAssembler* masm,
    119       AllocationSiteMode mode,
    120       Label* allocation_memento_found);
    121   static void GenerateSmiToDouble(MacroAssembler* masm,
    122                                   AllocationSiteMode mode,
    123                                   Label* fail);
    124   static void GenerateDoubleToObject(MacroAssembler* masm,
    125                                      AllocationSiteMode mode,
    126                                      Label* fail);
    127 
    128  private:
    129   DISALLOW_COPY_AND_ASSIGN(ElementsTransitionGenerator);
    130 };
    131 
    132 static const int kNumberDictionaryProbes = 4;
    133 
    134 
    135 class CodeAgingHelper {
    136  public:
    137   CodeAgingHelper();
    138 
    139   uint32_t young_sequence_length() const { return young_sequence_.length(); }
    140   bool IsYoung(byte* candidate) const {
    141     return memcmp(candidate,
    142                   young_sequence_.start(),
    143                   young_sequence_.length()) == 0;
    144   }
    145   void CopyYoungSequenceTo(byte* new_buffer) const {
    146     CopyBytes(new_buffer, young_sequence_.start(), young_sequence_.length());
    147   }
    148 
    149 #ifdef DEBUG
    150   bool IsOld(byte* candidate) const;
    151 #endif
    152 
    153  protected:
    154   const EmbeddedVector<byte, kNoCodeAgeSequenceLength> young_sequence_;
    155 #ifdef DEBUG
    156 #ifdef V8_TARGET_ARCH_ARM64
    157   const EmbeddedVector<byte, kNoCodeAgeSequenceLength> old_sequence_;
    158 #endif
    159 #endif
    160 };
    161 
    162 } }  // namespace v8::internal
    163 
    164 #endif  // V8_CODEGEN_H_
    165