void StackGuard::set_interrupt_limits(const ExecutionAccess& lock) {
ASSERT(isolate_ != NULL);
+ // Ignore attempts to interrupt when interrupts are postponed.
+ if (should_postpone_interrupts(lock)) return;
thread_local_.jslimit_ = kInterruptLimit;
thread_local_.climit_ = kInterruptLimit;
isolate_->heap()->SetStackLimits();
}
-void StackGuard::PushPostponeInterruptsScope(PostponeInterruptsScope* scope) {
+bool StackGuard::CheckInterrupt(int flagbit) {
ExecutionAccess access(isolate_);
- scope->prev_ = thread_local_.postpone_interrupts_;
- thread_local_.postpone_interrupts_ = scope;
+ return thread_local_.interrupt_flags_ & flagbit;
}
-void StackGuard::PopPostponeInterruptsScope() {
+void StackGuard::RequestInterrupt(int flagbit) {
ExecutionAccess access(isolate_);
- PostponeInterruptsScope* top = thread_local_.postpone_interrupts_;
- thread_local_.interrupt_flags_ |= top->intercepted_flags_;
- thread_local_.postpone_interrupts_ = top->prev_;
- if (has_pending_interrupts(access)) set_interrupt_limits(access);
-}
-
-
-bool StackGuard::CheckInterrupt(InterruptFlag flag) {
- ExecutionAccess access(isolate_);
- return thread_local_.interrupt_flags_ & flag;
-}
-
-
-void StackGuard::RequestInterrupt(InterruptFlag flag) {
- ExecutionAccess access(isolate_);
- // Check the chain of PostponeInterruptsScopes for interception.
- if (thread_local_.postpone_interrupts_ &&
- thread_local_.postpone_interrupts_->Intercept(flag)) {
- return;
- }
-
- // Not intercepted. Set as active interrupt flag.
- thread_local_.interrupt_flags_ |= flag;
+ thread_local_.interrupt_flags_ |= flagbit;
set_interrupt_limits(access);
}
-void StackGuard::ClearInterrupt(InterruptFlag flag) {
+void StackGuard::ClearInterrupt(int flagbit) {
ExecutionAccess access(isolate_);
- // Clear the interrupt flag from the chain of PostponeInterruptsScopes.
- for (PostponeInterruptsScope* current = thread_local_.postpone_interrupts_;
- current != NULL;
- current = current->prev_) {
- current->intercepted_flags_ &= ~flag;
+ thread_local_.interrupt_flags_ &= ~flagbit;
+ if (!should_postpone_interrupts(access) && !has_pending_interrupts(access)) {
+ reset_limits(access);
}
-
- // Clear the interrupt flag from the active interrupt flags.
- thread_local_.interrupt_flags_ &= ~flag;
- if (!has_pending_interrupts(access)) reset_limits(access);
}
bool StackGuard::CheckAndClearInterrupt(InterruptFlag flag) {
ExecutionAccess access(isolate_);
- bool result = (thread_local_.interrupt_flags_ & flag);
- thread_local_.interrupt_flags_ &= ~flag;
- if (!has_pending_interrupts(access)) reset_limits(access);
+ int flagbit = 1 << flag;
+ bool result = (thread_local_.interrupt_flags_ & flagbit);
+ thread_local_.interrupt_flags_ &= ~flagbit;
+ if (!should_postpone_interrupts(access) && !has_pending_interrupts(access)) {
+ reset_limits(access);
+ }
return result;
}
jslimit_ = kIllegalLimit;
real_climit_ = kIllegalLimit;
climit_ = kIllegalLimit;
- postpone_interrupts_ = NULL;
+ nesting_ = 0;
+ postpone_interrupts_nesting_ = 0;
interrupt_flags_ = 0;
}
climit_ = limit;
should_set_stack_limits = true;
}
- postpone_interrupts_ = NULL;
+ nesting_ = 0;
+ postpone_interrupts_nesting_ = 0;
interrupt_flags_ = 0;
return should_set_stack_limits;
}
Object* StackGuard::HandleInterrupts() {
+ {
+ ExecutionAccess access(isolate_);
+ if (should_postpone_interrupts(access)) {
+ return isolate_->heap()->undefined_value();
+ }
+ }
+
if (CheckAndClearInterrupt(GC_REQUEST)) {
isolate_->heap()->CollectAllGarbage(Heap::kNoGCFlags, "GC interrupt");
}
class ExecutionAccess;
-class PostponeInterruptsScope;
// StackGuard contains the handling of the limits that are used to limit the
// it has been set up.
void ClearThread(const ExecutionAccess& lock);
-#define INTERRUPT_LIST(V) \
- V(DEBUGBREAK, DebugBreak, 0) \
- V(DEBUGCOMMAND, DebugCommand, 1) \
- V(TERMINATE_EXECUTION, TerminateExecution, 2) \
- V(GC_REQUEST, GC, 3) \
- V(INSTALL_CODE, InstallCode, 4) \
- V(API_INTERRUPT, ApiInterrupt, 5) \
- V(DEOPT_MARKED_ALLOCATION_SITES, DeoptMarkedAllocationSites, 6)
-
-#define V(NAME, Name, id) \
- inline bool Check##Name() { return CheckInterrupt(NAME); } \
- inline void Request##Name() { RequestInterrupt(NAME); } \
- inline void Clear##Name() { ClearInterrupt(NAME); }
+#define INTERRUPT_LIST(V) \
+ V(DEBUGBREAK, DebugBreak) \
+ V(DEBUGCOMMAND, DebugCommand) \
+ V(TERMINATE_EXECUTION, TerminateExecution) \
+ V(GC_REQUEST, GC) \
+ V(INSTALL_CODE, InstallCode) \
+ V(API_INTERRUPT, ApiInterrupt) \
+ V(DEOPT_MARKED_ALLOCATION_SITES, DeoptMarkedAllocationSites)
+
+#define V(NAME, Name) \
+ inline bool Check##Name() { return CheckInterrupt(1 << NAME); } \
+ inline void Request##Name() { RequestInterrupt(1 << NAME); } \
+ inline void Clear##Name() { ClearInterrupt(1 << NAME); }
INTERRUPT_LIST(V)
#undef V
- // Flag used to set the interrupt causes.
- enum InterruptFlag {
- #define V(NAME, Name, id) NAME = (1 << id),
- INTERRUPT_LIST(V)
- #undef V
- #define V(NAME, Name, id) NAME |
- ALL_INTERRUPTS = INTERRUPT_LIST(V) 0
- #undef V
- };
-
// This provides an asynchronous read of the stack limits for the current
// thread. There are no locks protecting this, but it is assumed that you
// have the global V8 lock if you are using multiple V8 threads.
private:
StackGuard();
- bool CheckInterrupt(InterruptFlag flag);
- void RequestInterrupt(InterruptFlag flag);
- void ClearInterrupt(InterruptFlag flag);
+// Flag used to set the interrupt causes.
+enum InterruptFlag {
+#define V(NAME, Name) NAME,
+ INTERRUPT_LIST(V)
+#undef V
+ NUMBER_OF_INTERRUPTS
+};
+
+ bool CheckInterrupt(int flagbit);
+ void RequestInterrupt(int flagbit);
+ void ClearInterrupt(int flagbit);
bool CheckAndClearInterrupt(InterruptFlag flag);
// You should hold the ExecutionAccess lock when calling this method.
bool has_pending_interrupts(const ExecutionAccess& lock) {
+ // Sanity check: We shouldn't be asking about pending interrupts
+ // unless we're not postponing them anymore.
+ ASSERT(!should_postpone_interrupts(lock));
return thread_local_.interrupt_flags_ != 0;
}
// You should hold the ExecutionAccess lock when calling this method.
+ bool should_postpone_interrupts(const ExecutionAccess& lock) {
+ return thread_local_.postpone_interrupts_nesting_ > 0;
+ }
+
+ // You should hold the ExecutionAccess lock when calling this method.
inline void set_interrupt_limits(const ExecutionAccess& lock);
// Reset limits to actual values. For example after handling interrupt.
static const uintptr_t kIllegalLimit = 0xfffffff8;
#endif
- void PushPostponeInterruptsScope(PostponeInterruptsScope* scope);
- void PopPostponeInterruptsScope();
-
class ThreadLocal V8_FINAL {
public:
ThreadLocal() { Clear(); }
uintptr_t real_climit_; // Actual C++ stack limit set for the VM.
uintptr_t climit_;
- PostponeInterruptsScope* postpone_interrupts_;
+ int nesting_;
+ int postpone_interrupts_nesting_;
int interrupt_flags_;
};
}
-bool PostponeInterruptsScope::Intercept(StackGuard::InterruptFlag flag) {
- // First check whether the previous scope intercepts.
- if (prev_ && prev_->Intercept(flag)) return true;
- // Then check whether this scope intercepts.
- if ((flag & intercept_mask_)) {
- intercepted_flags_ |= flag;
- return true;
- }
- return false;
-}
-
} } // namespace v8::internal
// account.
class PostponeInterruptsScope BASE_EMBEDDED {
public:
- PostponeInterruptsScope(Isolate* isolate,
- int intercept_mask = StackGuard::ALL_INTERRUPTS)
- : stack_guard_(isolate->stack_guard()),
- intercept_mask_(intercept_mask),
- intercepted_flags_(0) {
- stack_guard_->PushPostponeInterruptsScope(this);
+ explicit PostponeInterruptsScope(Isolate* isolate)
+ : stack_guard_(isolate->stack_guard()), isolate_(isolate) {
+ ExecutionAccess access(isolate_);
+ stack_guard_->thread_local_.postpone_interrupts_nesting_++;
+ stack_guard_->DisableInterrupts();
}
~PostponeInterruptsScope() {
- stack_guard_->PopPostponeInterruptsScope();
+ ExecutionAccess access(isolate_);
+ if (--stack_guard_->thread_local_.postpone_interrupts_nesting_ == 0) {
+ stack_guard_->EnableInterrupts();
+ }
}
-
- // Find the bottom-most scope that intercepts this interrupt.
- // Return whether the interrupt has been intercepted.
- bool Intercept(StackGuard::InterruptFlag flag);
-
private:
StackGuard* stack_guard_;
- int intercept_mask_;
- int intercepted_flags_;
- PostponeInterruptsScope* prev_;
-
- friend class StackGuard;
+ Isolate* isolate_;
};
delete semaphore;
semaphore = NULL;
}
-
-
-static int callback_counter = 0;
-
-
-static void CounterCallback(v8::Isolate* isolate, void* data) {
- callback_counter++;
-}
-
-
-TEST(PostponeTerminateException) {
- v8::Isolate* isolate = CcTest::isolate();
- v8::HandleScope scope(isolate);
- v8::Handle<v8::ObjectTemplate> global =
- CreateGlobalTemplate(CcTest::isolate(), TerminateCurrentThread, DoLoop);
- v8::Handle<v8::Context> context =
- v8::Context::New(CcTest::isolate(), NULL, global);
- v8::Context::Scope context_scope(context);
-
- v8::TryCatch try_catch;
- static const char* terminate_and_loop =
- "terminate(); for (var i = 0; i < 10000; i++);";
-
- { // Postpone terminate execution interrupts.
- i::PostponeInterruptsScope p1(CcTest::i_isolate(),
- i::StackGuard::TERMINATE_EXECUTION) ;
-
- // API interrupts should still be triggered.
- CcTest::isolate()->RequestInterrupt(&CounterCallback, NULL);
- CHECK_EQ(0, callback_counter);
- CompileRun(terminate_and_loop);
- CHECK(!try_catch.HasTerminated());
- CHECK_EQ(1, callback_counter);
-
- { // Postpone API interrupts as well.
- i::PostponeInterruptsScope p2(CcTest::i_isolate(),
- i::StackGuard::API_INTERRUPT);
-
- // None of the two interrupts should trigger.
- CcTest::isolate()->RequestInterrupt(&CounterCallback, NULL);
- CompileRun(terminate_and_loop);
- CHECK(!try_catch.HasTerminated());
- CHECK_EQ(1, callback_counter);
- }
-
- // Now the previously requested API interrupt should trigger.
- CompileRun(terminate_and_loop);
- CHECK(!try_catch.HasTerminated());
- CHECK_EQ(2, callback_counter);
- }
-
- // Now the previously requested terminate execution interrupt should trigger.
- CompileRun("for (var i = 0; i < 10000; i++);");
- CHECK(try_catch.HasTerminated());
- CHECK_EQ(2, callback_counter);
-}
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