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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_ARGUMENTS_H_ | 5 #ifndef V8_ARGUMENTS_H_ |
6 #define V8_ARGUMENTS_H_ | 6 #define V8_ARGUMENTS_H_ |
7 | 7 |
8 #include "src/allocation.h" | 8 #include "src/allocation.h" |
9 #include "src/isolate.h" | 9 #include "src/isolate.h" |
10 | 10 |
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22 // Object* Runtime_function(Arguments args) { | 22 // Object* Runtime_function(Arguments args) { |
23 // ... use args[i] here ... | 23 // ... use args[i] here ... |
24 // } | 24 // } |
25 // | 25 // |
26 // Note that length_ (whose value is in the integer range) is defined | 26 // Note that length_ (whose value is in the integer range) is defined |
27 // as intptr_t to provide endian-neutrality on 64-bit archs. | 27 // as intptr_t to provide endian-neutrality on 64-bit archs. |
28 | 28 |
29 class Arguments BASE_EMBEDDED { | 29 class Arguments BASE_EMBEDDED { |
30 public: | 30 public: |
31 Arguments(int length, Object** arguments) | 31 Arguments(int length, Object** arguments) |
32 : length_(length), arguments_(arguments) { | 32 : length_(length), arguments_(arguments) { } |
33 DCHECK_GE(length_, 0); | |
34 } | |
35 | 33 |
36 Object*& operator[] (int index) { | 34 Object*& operator[] (int index) { |
37 DCHECK_GE(index, 0); | 35 DCHECK(0 <= index && index < length_); |
38 DCHECK_LT(static_cast<uint32_t>(index), static_cast<uint32_t>(length_)); | |
39 return *(reinterpret_cast<Object**>(reinterpret_cast<intptr_t>(arguments_) - | 36 return *(reinterpret_cast<Object**>(reinterpret_cast<intptr_t>(arguments_) - |
40 index * kPointerSize)); | 37 index * kPointerSize)); |
41 } | 38 } |
42 | 39 |
43 template <class S> Handle<S> at(int index) { | 40 template <class S> Handle<S> at(int index) { |
44 Object** value = &((*this)[index]); | 41 Object** value = &((*this)[index]); |
45 // This cast checks that the object we're accessing does indeed have the | 42 // This cast checks that the object we're accessing does indeed have the |
46 // expected type. | 43 // expected type. |
47 S::cast(*value); | 44 S::cast(*value); |
48 return Handle<S>(reinterpret_cast<S**>(value)); | 45 return Handle<S>(reinterpret_cast<S**>(value)); |
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283 | 280 |
284 | 281 |
285 #define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name) | 282 #define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name) |
286 #define RUNTIME_FUNCTION_RETURN_PAIR(Name) \ | 283 #define RUNTIME_FUNCTION_RETURN_PAIR(Name) \ |
287 RUNTIME_FUNCTION_RETURNS_TYPE(ObjectPair, Name) | 284 RUNTIME_FUNCTION_RETURNS_TYPE(ObjectPair, Name) |
288 | 285 |
289 } // namespace internal | 286 } // namespace internal |
290 } // namespace v8 | 287 } // namespace v8 |
291 | 288 |
292 #endif // V8_ARGUMENTS_H_ | 289 #endif // V8_ARGUMENTS_H_ |
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