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1 : // Copyright 2011 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_SNAPSHOT_NATIVES_H_
6 : #define V8_SNAPSHOT_NATIVES_H_
7 :
8 : #include "include/v8.h"
9 : #include "src/objects.h"
10 : #include "src/vector.h"
11 :
12 : namespace v8 { class StartupData; } // Forward declaration.
13 :
14 : namespace v8 {
15 : namespace internal {
16 :
17 : enum NativeType {
18 : CORE,
19 : EXTRAS,
20 : EXPERIMENTAL_EXTRAS,
21 : D8,
22 : TEST
23 : };
24 :
25 : // Extra handling for V8_EXPORT_PRIVATE in combination with USING_V8_SHARED
26 : // since definition of methods of classes marked as dllimport is not allowed.
27 : template <NativeType type>
28 : #ifdef USING_V8_SHARED
29 : class NativesCollection {
30 : #else
31 : class V8_EXPORT_PRIVATE NativesCollection {
32 : #endif // USING_V8_SHARED
33 :
34 : public:
35 : // The following methods are implemented in js2c-generated code:
36 :
37 : // Number of built-in scripts.
38 : static int GetBuiltinsCount();
39 : // Number of debugger implementation scripts.
40 : static int GetDebuggerCount();
41 :
42 : // These are used to access built-in scripts. The debugger implementation
43 : // scripts have an index in the interval [0, GetDebuggerCount()). The
44 : // non-debugger scripts have an index in the interval [GetDebuggerCount(),
45 : // GetNativesCount()).
46 : static int GetIndex(const char* name);
47 : static Vector<const char> GetScriptSource(int index);
48 : static Vector<const char> GetScriptName(int index);
49 : static Vector<const char> GetScriptsSource();
50 : };
51 :
52 : typedef NativesCollection<CORE> Natives;
53 : typedef NativesCollection<EXTRAS> ExtraNatives;
54 : typedef NativesCollection<EXPERIMENTAL_EXTRAS> ExperimentalExtraNatives;
55 :
56 :
57 : #ifdef V8_USE_EXTERNAL_STARTUP_DATA
58 : // Used for reading the natives at runtime. Implementation in natives-empty.cc
59 : void SetNativesFromFile(StartupData* natives_blob);
60 : void ReadNatives();
61 : void DisposeNatives();
62 : #endif
63 :
64 1930198 : class NativesExternalStringResource final
65 : : public v8::String::ExternalOneByteStringResource {
66 : public:
67 : NativesExternalStringResource(NativeType type, int index);
68 :
69 474083 : const char* data() const override { return data_; }
70 18689 : size_t length() const override { return length_; }
71 :
72 : v8::String::ExternalOneByteStringResource* EncodeForSerialization() const {
73 : DCHECK(type_ == CORE || type_ == EXTRAS);
74 1840 : intptr_t val = (index_ << 1) | ((type_ == CORE) ? 0 : 1);
75 1840 : val = val << kPointerSizeLog2; // Pointer align.
76 1840 : return reinterpret_cast<v8::String::ExternalOneByteStringResource*>(val);
77 : }
78 :
79 : // Decode from serialization.
80 971439 : static NativesExternalStringResource* DecodeForDeserialization(
81 : const v8::String::ExternalOneByteStringResource* encoded) {
82 971439 : intptr_t val = reinterpret_cast<intptr_t>(encoded) >> kPointerSizeLog2;
83 971439 : NativeType type = (val & 1) ? EXTRAS : CORE;
84 971439 : int index = static_cast<int>(val >> 1);
85 971439 : return new NativesExternalStringResource(type, index);
86 : }
87 :
88 : private:
89 : const char* data_;
90 : size_t length_;
91 : NativeType type_;
92 : int index_;
93 : };
94 :
95 : } // namespace internal
96 : } // namespace v8
97 :
98 : #endif // V8_SNAPSHOT_NATIVES_H_
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