Line data    Source code

       1             : // Copyright 2015 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_INTERPRETER_INTERPRETER_H_
       6             : #define V8_INTERPRETER_INTERPRETER_H_
       7             : 
       8             : #include <memory>
       9             : 
      10             : // Clients of this interface shouldn't depend on lots of interpreter internals.
      11             : // Do not include anything from src/interpreter other than
      12             : // src/interpreter/bytecodes.h here!
      13             : #include "src/base/macros.h"
      14             : #include "src/builtins/builtins.h"
      15             : #include "src/interpreter/bytecodes.h"
      16             : #include "src/runtime/runtime.h"
      17             : 
      18             : namespace v8 {
      19             : namespace internal {
      20             : 
      21             : class Isolate;
      22             : class Callable;
      23             : class UnoptimizedCompilationJob;
      24             : class FunctionLiteral;
      25             : class ParseInfo;
      26             : class RootVisitor;
      27             : class SetupIsolateDelegate;
      28             : template <typename>
      29             : class ZoneVector;
      30             : 
      31             : namespace interpreter {
      32             : 
      33             : class InterpreterAssembler;
      34             : 
      35             : class Interpreter {
      36             :  public:
      37             :   explicit Interpreter(Isolate* isolate);
      38      124814 :   virtual ~Interpreter() = default;
      39             : 
      40             :   // Returns the interrupt budget which should be used for the profiler counter.
      41             :   V8_EXPORT_PRIVATE static int InterruptBudget();
      42             : 
      43             :   // Creates a compilation job which will generate bytecode for |literal|.
      44             :   // Additionally, if |eager_inner_literals| is not null, adds any eagerly
      45             :   // compilable inner FunctionLiterals to this list.
      46             :   static UnoptimizedCompilationJob* NewCompilationJob(
      47             :       ParseInfo* parse_info, FunctionLiteral* literal,
      48             :       AccountingAllocator* allocator,
      49             :       std::vector<FunctionLiteral*>* eager_inner_literals);
      50             : 
      51             :   // If the bytecode handler for |bytecode| and |operand_scale| has not yet
      52             :   // been loaded, deserialize it. Then return the handler.
      53             :   V8_EXPORT_PRIVATE Code GetBytecodeHandler(Bytecode bytecode,
      54             :                                             OperandScale operand_scale);
      55             : 
      56             :   // Set the bytecode handler for |bytecode| and |operand_scale|.
      57             :   void SetBytecodeHandler(Bytecode bytecode, OperandScale operand_scale,
      58             :                           Code handler);
      59             : 
      60             :   // GC support.
      61             :   void IterateDispatchTable(RootVisitor* v);
      62             : 
      63             :   // Disassembler support (only useful with ENABLE_DISASSEMBLER defined).
      64             :   const char* LookupNameOfBytecodeHandler(const Code code);
      65             : 
      66             :   V8_EXPORT_PRIVATE Local<v8::Object> GetDispatchCountersObject();
      67             : 
      68             :   void ForEachBytecode(const std::function<void(Bytecode, OperandScale)>& f);
      69             : 
      70             :   void Initialize();
      71             : 
      72             :   bool IsDispatchTableInitialized() const;
      73             : 
      74             :   Address dispatch_table_address() {
      75       64102 :     return reinterpret_cast<Address>(&dispatch_table_[0]);
      76             :   }
      77             : 
      78             :   Address bytecode_dispatch_counters_table() {
      79       62422 :     return reinterpret_cast<Address>(bytecode_dispatch_counters_table_.get());
      80             :   }
      81             : 
      82             :   Address address_of_interpreter_entry_trampoline_instruction_start() const {
      83             :     return reinterpret_cast<Address>(
      84       62534 :         &interpreter_entry_trampoline_instruction_start_);
      85             :   }
      86             : 
      87             :  private:
      88             :   friend class SetupInterpreter;
      89             :   friend class v8::internal::SetupIsolateDelegate;
      90             : 
      91             :   uintptr_t GetDispatchCounter(Bytecode from, Bytecode to) const;
      92             : 
      93             :   // Get dispatch table index of bytecode.
      94             :   static size_t GetDispatchTableIndex(Bytecode bytecode,
      95             :                                       OperandScale operand_scale);
      96             : 
      97             :   static const int kNumberOfWideVariants = BytecodeOperands::kOperandScaleCount;
      98             :   static const int kDispatchTableSize = kNumberOfWideVariants * (kMaxUInt8 + 1);
      99             :   static const int kNumberOfBytecodes = static_cast<int>(Bytecode::kLast) + 1;
     100             : 
     101             :   Isolate* isolate_;
     102             :   Address dispatch_table_[kDispatchTableSize];
     103             :   std::unique_ptr<uintptr_t[]> bytecode_dispatch_counters_table_;
     104             :   Address interpreter_entry_trampoline_instruction_start_;
     105             : 
     106             :   DISALLOW_COPY_AND_ASSIGN(Interpreter);
     107             : };
     108             : 
     109             : }  // namespace interpreter
     110             : }  // namespace internal
     111             : }  // namespace v8
     112             : 
     113             : #endif  // V8_INTERPRETER_INTERPRETER_H_