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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef VM_ALLOCATION_H_ | 5 #ifndef VM_ALLOCATION_H_ |
6 #define VM_ALLOCATION_H_ | 6 #define VM_ALLOCATION_H_ |
7 | 7 |
8 #include "platform/assert.h" | 8 #include "platform/assert.h" |
| 9 #include "vm/base_isolate.h" |
9 #include "vm/globals.h" | 10 #include "vm/globals.h" |
10 | 11 |
11 namespace dart { | 12 namespace dart { |
12 | 13 |
13 // Forward declarations. | 14 // Forward declarations. |
14 class Isolate; | 15 class Isolate; |
15 | 16 |
16 // Stack allocated objects subclass from this base class. Objects of this type | 17 // Stack allocated objects subclass from this base class. Objects of this type |
17 // cannot be allocated on either the C or object heaps. Destructors for objects | 18 // cannot be allocated on either the C or object heaps. Destructors for objects |
18 // of this type will not be run unless the stack is unwound through normal | 19 // of this type will not be run unless the stack is unwound through normal |
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29 }; | 30 }; |
30 | 31 |
31 | 32 |
32 // Stack resources subclass from this base class. The VM will ensure that the | 33 // Stack resources subclass from this base class. The VM will ensure that the |
33 // destructors of these objects are called before the stack is unwound past the | 34 // destructors of these objects are called before the stack is unwound past the |
34 // objects location on the stack. Use stack resource objects if objects | 35 // objects location on the stack. Use stack resource objects if objects |
35 // need to be destroyed even in the case of exceptions when a Longjump is done | 36 // need to be destroyed even in the case of exceptions when a Longjump is done |
36 // to a stack frame above the frame where these objects were allocated. | 37 // to a stack frame above the frame where these objects were allocated. |
37 class StackResource { | 38 class StackResource { |
38 public: | 39 public: |
39 explicit StackResource(Isolate* isolate); | 40 explicit StackResource(BaseIsolate* isolate) |
40 virtual ~StackResource(); | 41 : isolate_(isolate), previous_(NULL) { |
| 42 // We can only have longjumps and exceptions when there is a current |
| 43 // isolate. If there is no current isolate, we don't need to |
| 44 // protect this case. |
| 45 if (isolate) { |
| 46 previous_ = isolate->top_resource(); |
| 47 isolate->set_top_resource(this); |
| 48 } |
| 49 } |
41 | 50 |
42 Isolate* isolate() const { return isolate_; } | 51 virtual ~StackResource() { |
| 52 if (isolate()) { |
| 53 StackResource* top = isolate()->top_resource(); |
| 54 ASSERT(top == this); |
| 55 isolate()->set_top_resource(previous_); |
| 56 } |
| 57 #if defined(DEBUG) |
| 58 BaseIsolate::AssertCurrent(isolate()); |
| 59 #endif |
| 60 } |
| 61 |
| 62 BaseIsolate* isolate() const { return isolate_; } |
43 | 63 |
44 // The delete operator should be private instead of public, but unfortunately | 64 // The delete operator should be private instead of public, but unfortunately |
45 // the compiler complains when compiling the destructors for subclasses. | 65 // the compiler complains when compiling the destructors for subclasses. |
46 void operator delete(void* pointer) { UNREACHABLE(); } | 66 void operator delete(void* pointer) { UNREACHABLE(); } |
47 | 67 |
48 private: | 68 private: |
49 Isolate* isolate_; // Current isolate for this stack resource. | 69 BaseIsolate* isolate_; // Current isolate for this stack resource. |
50 StackResource* previous_; | 70 StackResource* previous_; |
51 | 71 |
52 void* operator new(uword size); | 72 void* operator new(uword size); |
53 | 73 |
54 DISALLOW_IMPLICIT_CONSTRUCTORS(StackResource); | 74 DISALLOW_IMPLICIT_CONSTRUCTORS(StackResource); |
55 }; | 75 }; |
56 | 76 |
57 | 77 |
58 // Static allocated classes only contain static members and can never | 78 // Static allocated classes only contain static members and can never |
59 // be instantiated in the heap or on the stack. | 79 // be instantiated in the heap or on the stack. |
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87 // deallocated by invoking DeleteAll() on the zone they live in. | 107 // deallocated by invoking DeleteAll() on the zone they live in. |
88 void operator delete(void* pointer) { UNREACHABLE(); } | 108 void operator delete(void* pointer) { UNREACHABLE(); } |
89 | 109 |
90 private: | 110 private: |
91 DISALLOW_COPY_AND_ASSIGN(ZoneAllocated); | 111 DISALLOW_COPY_AND_ASSIGN(ZoneAllocated); |
92 }; | 112 }; |
93 | 113 |
94 } // namespace dart | 114 } // namespace dart |
95 | 115 |
96 #endif // VM_ALLOCATION_H_ | 116 #endif // VM_ALLOCATION_H_ |
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