Line data    Source code

       1             : // Copyright 2014 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_BOOTSTRAPPER_H_
       6             : #define V8_BOOTSTRAPPER_H_
       7             : 
       8             : #include "src/heap/factory.h"
       9             : #include "src/objects/fixed-array.h"
      10             : #include "src/objects/shared-function-info.h"
      11             : #include "src/objects/slots.h"
      12             : #include "src/snapshot/natives.h"
      13             : #include "src/visitors.h"
      14             : 
      15             : namespace v8 {
      16             : namespace internal {
      17             : 
      18             : // A SourceCodeCache uses a FixedArray to store pairs of
      19             : // (OneByteString, SharedFunctionInfo), mapping names of native code files
      20             : // (array.js, etc.) to precompiled functions. Instead of mapping
      21             : // names to functions it might make sense to let the JS2C tool
      22             : // generate an index for each native JS file.
      23             : class SourceCodeCache final {
      24             :  public:
      25       61049 :   explicit SourceCodeCache(Script::Type type) : type_(type) {}
      26             : 
      27             :   void Initialize(Isolate* isolate, bool create_heap_objects);
      28             : 
      29             :   void Iterate(RootVisitor* v);
      30             : 
      31             :   bool Lookup(Isolate* isolate, Vector<const char> name,
      32             :               Handle<SharedFunctionInfo>* handle);
      33             : 
      34             :   void Add(Isolate* isolate, Vector<const char> name,
      35             :            Handle<SharedFunctionInfo> shared);
      36             : 
      37             :  private:
      38             :   Script::Type type_;
      39             :   FixedArray cache_;
      40             :   DISALLOW_COPY_AND_ASSIGN(SourceCodeCache);
      41             : };
      42             : 
      43             : 
      44             : // The Boostrapper is the public interface for creating a JavaScript global
      45             : // context.
      46             : class Bootstrapper final {
      47             :  public:
      48             :   static void InitializeOncePerProcess();
      49             : 
      50             :   // Requires: Heap::SetUp has been called.
      51             :   void Initialize(bool create_heap_objects);
      52             :   void TearDown();
      53             : 
      54             :   // Creates a JavaScript Global Context with initial object graph.
      55             :   // The returned value is a global handle casted to V8Environment*.
      56             :   Handle<Context> CreateEnvironment(
      57             :       MaybeHandle<JSGlobalProxy> maybe_global_proxy,
      58             :       v8::Local<v8::ObjectTemplate> global_object_template,
      59             :       v8::ExtensionConfiguration* extensions, size_t context_snapshot_index,
      60             :       v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer);
      61             : 
      62             :   Handle<JSGlobalProxy> NewRemoteContext(
      63             :       MaybeHandle<JSGlobalProxy> maybe_global_proxy,
      64             :       v8::Local<v8::ObjectTemplate> global_object_template);
      65             : 
      66             :   // Detach the environment from its outer global object.
      67             :   void DetachGlobal(Handle<Context> env);
      68             : 
      69             :   // Traverses the pointers for memory management.
      70             :   void Iterate(RootVisitor* v);
      71             : 
      72             :   // Accessor for the native scripts source code.
      73             :   Handle<String> GetNativeSource(NativeType type, int index);
      74             : 
      75             :   // Tells whether bootstrapping is active.
      76           0 :   bool IsActive() const { return nesting_ != 0; }
      77             : 
      78             :   // Support for thread preemption.
      79             :   static int ArchiveSpacePerThread();
      80             :   char* ArchiveState(char* to);
      81             :   char* RestoreState(char* from);
      82             :   void FreeThreadResources();
      83             : 
      84             :   // Used for new context creation.
      85             :   bool InstallExtensions(Handle<Context> native_context,
      86             :                          v8::ExtensionConfiguration* extensions);
      87             : 
      88             :   SourceCodeCache* extensions_cache() { return &extensions_cache_; }
      89             : 
      90             :   static bool CompileNative(Isolate* isolate, Vector<const char> name,
      91             :                             Handle<String> source, int argc,
      92             :                             Handle<Object> argv[], NativesFlag natives_flag);
      93             :   static bool CompileExtraBuiltin(Isolate* isolate, int index);
      94             :   static bool CompileExperimentalExtraBuiltin(Isolate* isolate, int index);
      95             : 
      96             :  private:
      97             :   // Log newly created Map objects if no snapshot was used.
      98             :   void LogAllMaps();
      99             : 
     100             :   Isolate* isolate_;
     101             :   typedef int NestingCounterType;
     102             :   NestingCounterType nesting_;
     103             :   SourceCodeCache extensions_cache_;
     104             : 
     105             :   friend class BootstrapperActive;
     106             :   friend class Isolate;
     107             :   friend class NativesExternalStringResource;
     108             : 
     109             :   explicit Bootstrapper(Isolate* isolate);
     110             : 
     111             :   DISALLOW_COPY_AND_ASSIGN(Bootstrapper);
     112             : };
     113             : 
     114             : class BootstrapperActive final {
     115             :  public:
     116             :   explicit BootstrapperActive(Bootstrapper* bootstrapper)
     117       89815 :       : bootstrapper_(bootstrapper) {
     118      179311 :     ++bootstrapper_->nesting_;
     119             :   }
     120             : 
     121             :   ~BootstrapperActive() {
     122       89536 :     --bootstrapper_->nesting_;
     123             :   }
     124             : 
     125             :  private:
     126             :   Bootstrapper* bootstrapper_;
     127             : 
     128             :   DISALLOW_COPY_AND_ASSIGN(BootstrapperActive);
     129             : };
     130             : 
     131             : }  // namespace internal
     132             : }  // namespace v8
     133             : 
     134             : #endif  // V8_BOOTSTRAPPER_H_