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Issue 1895973002: Remove all non-function-name uses of CONST_LEGACY (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Remove now-unused bits in TF and CS Created 4 years, 8 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef V8_CONTEXTS_H_ 5 #ifndef V8_CONTEXTS_H_
6 #define V8_CONTEXTS_H_ 6 #define V8_CONTEXTS_H_
7 7
8 #include "src/heap/heap.h" 8 #include "src/heap/heap.h"
9 #include "src/objects.h" 9 #include "src/objects.h"
10 10
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23 LEXICAL_TEST = 23 LEXICAL_TEST =
24 FOLLOW_CONTEXT_CHAIN | STOP_AT_DECLARATION_SCOPE | SKIP_WITH_CONTEXT, 24 FOLLOW_CONTEXT_CHAIN | STOP_AT_DECLARATION_SCOPE | SKIP_WITH_CONTEXT,
25 }; 25 };
26 26
27 27
28 // ES5 10.2 defines lexical environments with mutable and immutable bindings. 28 // ES5 10.2 defines lexical environments with mutable and immutable bindings.
29 // Immutable bindings have two states, initialized and uninitialized, and 29 // Immutable bindings have two states, initialized and uninitialized, and
30 // their state is changed by the InitializeImmutableBinding method. The 30 // their state is changed by the InitializeImmutableBinding method. The
31 // BindingFlags enum represents information if a binding has definitely been 31 // BindingFlags enum represents information if a binding has definitely been
32 // initialized. A mutable binding does not need to be checked and thus has 32 // initialized. A mutable binding does not need to be checked and thus has
33 // the BindingFlag MUTABLE_IS_INITIALIZED. 33 // the BindingFlag BINDING_IS_INITIALIZED.
34 // 34 //
35 // There are two possibilities for immutable bindings 35 // There is one possibility for legacy immutable bindings:
36 // * 'const' declared variables. They are initialized when evaluating the
37 // corresponding declaration statement. They need to be checked for being
38 // initialized and thus get the flag IMMUTABLE_CHECK_INITIALIZED.
39 // * The function name of a named function literal. The binding is immediately 36 // * The function name of a named function literal. The binding is immediately
40 // initialized when entering the function and thus does not need to be 37 // initialized when entering the function and thus does not need to be
41 // checked. it gets the BindingFlag IMMUTABLE_IS_INITIALIZED. 38 // checked. it gets the BindingFlag BINDING_IS_INITIALIZED.
42 // Accessing an uninitialized binding produces the undefined value.
43 // 39 //
44 // The harmony proposal for block scoped bindings also introduces the 40 // The harmony proposal for block scoped bindings also introduces the
45 // uninitialized state for mutable bindings. 41 // uninitialized state for mutable bindings.
46 // * A 'let' declared variable. They are initialized when evaluating the 42 // * A 'let' declared variable. They are initialized when evaluating the
47 // corresponding declaration statement. They need to be checked for being 43 // corresponding declaration statement. They need to be checked for being
48 // initialized and thus get the flag MUTABLE_CHECK_INITIALIZED. 44 // initialized and thus get the flag BINDING_CHECK_INITIALIZED.
49 // * A 'var' declared variable. It is initialized immediately upon creation 45 // * A 'var' declared variable. It is initialized immediately upon creation
50 // and thus doesn't need to be checked. It gets the flag 46 // and thus doesn't need to be checked. It gets the flag
51 // MUTABLE_IS_INITIALIZED. 47 // BINDING_IS_INITIALIZED.
52 // * Catch bound variables, function parameters and variables introduced by 48 // * Catch bound variables, function parameters and variables introduced by
53 // function declarations are initialized immediately and do not need to be 49 // function declarations are initialized immediately and do not need to be
54 // checked. Thus they get the flag MUTABLE_IS_INITIALIZED. 50 // checked. Thus they get the flag BINDING_IS_INITIALIZED.
55 // Immutable bindings in harmony mode get the _HARMONY flag variants. Accessing 51 // Accessing an uninitialized binding produces a reference error.
56 // an uninitialized binding produces a reference error.
57 // 52 //
58 // In V8 uninitialized bindings are set to the hole value upon creation and set 53 // In V8 uninitialized bindings are set to the hole value upon creation and set
59 // to a different value upon initialization. 54 // to a different value upon initialization.
60 enum BindingFlags { 55 enum BindingFlags {
61 MUTABLE_IS_INITIALIZED, 56 BINDING_IS_INITIALIZED,
62 MUTABLE_CHECK_INITIALIZED, 57 BINDING_CHECK_INITIALIZED,
63 IMMUTABLE_IS_INITIALIZED,
64 IMMUTABLE_CHECK_INITIALIZED,
65 IMMUTABLE_IS_INITIALIZED_HARMONY,
66 IMMUTABLE_CHECK_INITIALIZED_HARMONY,
67 MISSING_BINDING 58 MISSING_BINDING
68 }; 59 };
69 60
70
71 // Heap-allocated activation contexts. 61 // Heap-allocated activation contexts.
72 // 62 //
73 // Contexts are implemented as FixedArray objects; the Context 63 // Contexts are implemented as FixedArray objects; the Context
74 // class is a convenience interface casted on a FixedArray object. 64 // class is a convenience interface casted on a FixedArray object.
75 // 65 //
76 // Note: Context must have no virtual functions and Context objects 66 // Note: Context must have no virtual functions and Context objects
77 // must always be allocated via Heap::AllocateContext() or 67 // must always be allocated via Heap::AllocateContext() or
78 // Factory::NewContext. 68 // Factory::NewContext.
79 69
80 #define NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \ 70 #define NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V) \
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570 #endif 560 #endif
571 561
572 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); 562 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
573 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); 563 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
574 }; 564 };
575 565
576 } // namespace internal 566 } // namespace internal
577 } // namespace v8 567 } // namespace v8
578 568
579 #endif // V8_CONTEXTS_H_ 569 #endif // V8_CONTEXTS_H_
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