OLD | NEW |
1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, 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 #include "vm/longjump.h" | 5 #include "vm/longjump.h" |
6 | 6 |
7 #include "include/dart_api.h" | 7 #include "include/dart_api.h" |
8 | 8 |
9 #include "vm/dart_api_impl.h" | 9 #include "vm/dart_api_impl.h" |
10 #include "vm/isolate.h" | 10 #include "vm/isolate.h" |
11 #include "vm/object.h" | 11 #include "vm/object.h" |
12 #include "vm/object_store.h" | 12 #include "vm/object_store.h" |
13 #include "vm/os.h" | 13 #include "vm/os.h" |
14 #include "vm/simulator.h" | 14 #include "vm/simulator.h" |
15 | 15 |
16 namespace dart { | 16 namespace dart { |
17 | 17 |
18 jmp_buf* LongJumpScope::Set() { | 18 jmp_buf* LongJumpScope::Set() { |
19 ASSERT(top_ == NULL); | 19 ASSERT(top_ == NULL); |
20 top_ = Thread::Current()->top_resource(); | 20 top_ = Thread::Current()->top_resource(); |
21 return &environment_; | 21 return &environment_; |
22 } | 22 } |
23 | 23 |
24 | |
25 bool LongJumpScope::IsSafeToJump() { | 24 bool LongJumpScope::IsSafeToJump() { |
26 // We do not want to jump past Dart frames. Note that this code | 25 // We do not want to jump past Dart frames. Note that this code |
27 // assumes the stack grows from high to low. | 26 // assumes the stack grows from high to low. |
28 Thread* thread = Thread::Current(); | 27 Thread* thread = Thread::Current(); |
29 uword jumpbuf_addr = Thread::GetCurrentStackPointer(); | 28 uword jumpbuf_addr = Thread::GetCurrentStackPointer(); |
30 #if defined(USING_SIMULATOR) | 29 #if defined(USING_SIMULATOR) |
31 Simulator* sim = Simulator::Current(); | 30 Simulator* sim = Simulator::Current(); |
32 // When using simulator, only mutator thread should refer to Simulator | 31 // When using simulator, only mutator thread should refer to Simulator |
33 // since there can be only one per isolate. | 32 // since there can be only one per isolate. |
34 uword top_exit_frame_info = | 33 uword top_exit_frame_info = |
35 thread->IsMutatorThread() ? sim->top_exit_frame_info() : 0; | 34 thread->IsMutatorThread() ? sim->top_exit_frame_info() : 0; |
36 #else | 35 #else |
37 uword top_exit_frame_info = thread->top_exit_frame_info(); | 36 uword top_exit_frame_info = thread->top_exit_frame_info(); |
38 #endif | 37 #endif |
39 if (!thread->IsMutatorThread()) { | 38 if (!thread->IsMutatorThread()) { |
40 // A helper thread does not execute Dart code, so it's safe to jump. | 39 // A helper thread does not execute Dart code, so it's safe to jump. |
41 ASSERT(top_exit_frame_info == 0); | 40 ASSERT(top_exit_frame_info == 0); |
42 return true; | 41 return true; |
43 } | 42 } |
44 return ((top_exit_frame_info == 0) || (jumpbuf_addr < top_exit_frame_info)); | 43 return ((top_exit_frame_info == 0) || (jumpbuf_addr < top_exit_frame_info)); |
45 } | 44 } |
46 | 45 |
47 | |
48 void LongJumpScope::Jump(int value, const Error& error) { | 46 void LongJumpScope::Jump(int value, const Error& error) { |
49 // A zero is the default return value from setting up a LongJumpScope | 47 // A zero is the default return value from setting up a LongJumpScope |
50 // using Set. | 48 // using Set. |
51 ASSERT(value != 0); | 49 ASSERT(value != 0); |
52 ASSERT(IsSafeToJump()); | 50 ASSERT(IsSafeToJump()); |
53 | 51 |
54 Thread* thread = Thread::Current(); | 52 Thread* thread = Thread::Current(); |
55 | 53 |
56 #if defined(DEBUG) | 54 #if defined(DEBUG) |
57 #define CHECK_REUSABLE_HANDLE(name) \ | 55 #define CHECK_REUSABLE_HANDLE(name) \ |
58 ASSERT(!thread->reusable_##name##_handle_scope_active()); | 56 ASSERT(!thread->reusable_##name##_handle_scope_active()); |
59 REUSABLE_HANDLE_LIST(CHECK_REUSABLE_HANDLE) | 57 REUSABLE_HANDLE_LIST(CHECK_REUSABLE_HANDLE) |
60 #undef CHECK_REUSABLE_HANDLE | 58 #undef CHECK_REUSABLE_HANDLE |
61 #endif // defined(DEBUG) | 59 #endif // defined(DEBUG) |
62 | 60 |
63 // Remember the error in the sticky error of this isolate. | 61 // Remember the error in the sticky error of this isolate. |
64 thread->set_sticky_error(error); | 62 thread->set_sticky_error(error); |
65 | 63 |
66 // Destruct all the active StackResource objects. | 64 // Destruct all the active StackResource objects. |
67 StackResource::UnwindAbove(thread, top_); | 65 StackResource::UnwindAbove(thread, top_); |
68 longjmp(environment_, value); | 66 longjmp(environment_, value); |
69 UNREACHABLE(); | 67 UNREACHABLE(); |
70 } | 68 } |
71 | 69 |
72 } // namespace dart | 70 } // namespace dart |
OLD | NEW |