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