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877284947b
Like HOST_ARCH_*, HOST_OS_* describes the OS the VM is running on, which may be different from the OS the VM is generating code for during AOT compilation. Currently we conflate the two when emitting AOT as assembly, and we get away with it because Flutter only uses assembly for targeting iOS and one can only target iOS from a Mac, but we expect to use assembly for Android as well so native tools can unwind Dart frames. R=zra@google.com Review-Url: https://codereview.chromium.org/2750843003 .
127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "platform/globals.h"
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#if defined(HOST_OS_WINDOWS)
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#include "vm/flags.h"
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#include "vm/os.h"
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#include "vm/profiler.h"
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#include "vm/thread_interrupter.h"
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namespace dart {
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#ifndef PRODUCT
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DECLARE_FLAG(bool, thread_interrupter);
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DECLARE_FLAG(bool, trace_thread_interrupter);
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#define kThreadError -1
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class ThreadInterrupterWin : public AllStatic {
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public:
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static bool GrabRegisters(HANDLE handle, InterruptedThreadState* state) {
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CONTEXT context;
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memset(&context, 0, sizeof(context));
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#if defined(HOST_ARCH_IA32)
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// On IA32, CONTEXT_CONTROL includes Eip, Ebp, and Esp.
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context.ContextFlags = CONTEXT_CONTROL;
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#elif defined(HOST_ARCH_X64)
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// On X64, CONTEXT_CONTROL includes Rip and Rsp. Rbp is classified
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// as an "integer" register.
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context.ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER;
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#else
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#error Unsupported architecture.
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#endif
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if (GetThreadContext(handle, &context) != 0) {
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#if defined(HOST_ARCH_IA32)
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state->pc = static_cast<uintptr_t>(context.Eip);
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state->fp = static_cast<uintptr_t>(context.Ebp);
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state->csp = static_cast<uintptr_t>(context.Esp);
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state->dsp = static_cast<uintptr_t>(context.Esp);
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#elif defined(HOST_ARCH_X64)
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state->pc = static_cast<uintptr_t>(context.Rip);
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state->fp = static_cast<uintptr_t>(context.Rbp);
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state->csp = static_cast<uintptr_t>(context.Rsp);
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state->dsp = static_cast<uintptr_t>(context.Rsp);
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#else
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#error Unsupported architecture.
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#endif
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return true;
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}
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return false;
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}
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static void Interrupt(OSThread* os_thread) {
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ASSERT(!OSThread::Compare(GetCurrentThreadId(), os_thread->id()));
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HANDLE handle = OpenThread(
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THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION | THREAD_SUSPEND_RESUME,
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false, os_thread->id());
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ASSERT(handle != NULL);
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DWORD result = SuspendThread(handle);
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if (result == kThreadError) {
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if (FLAG_trace_thread_interrupter) {
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OS::PrintErr("ThreadInterrupter failed to suspend thread %p\n",
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reinterpret_cast<void*>(os_thread->id()));
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}
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CloseHandle(handle);
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return;
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}
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InterruptedThreadState its;
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if (!GrabRegisters(handle, &its)) {
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// Failed to get thread registers.
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ResumeThread(handle);
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if (FLAG_trace_thread_interrupter) {
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OS::PrintErr("ThreadInterrupter failed to get registers for %p\n",
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reinterpret_cast<void*>(os_thread->id()));
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}
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CloseHandle(handle);
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return;
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}
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// Currently we sample only threads that are associated
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// with an isolate. It is safe to call 'os_thread->thread()'
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// here as the thread which is being queried is suspended.
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Thread* thread = os_thread->thread();
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if (thread != NULL) {
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Profiler::SampleThread(thread, its);
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}
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ResumeThread(handle);
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CloseHandle(handle);
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}
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};
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bool ThreadInterrupter::IsDebuggerAttached() {
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return false;
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}
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void ThreadInterrupter::InterruptThread(OSThread* thread) {
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if (FLAG_trace_thread_interrupter) {
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OS::PrintErr("ThreadInterrupter suspending %p\n",
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reinterpret_cast<void*>(thread->id()));
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}
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ThreadInterrupterWin::Interrupt(thread);
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if (FLAG_trace_thread_interrupter) {
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OS::PrintErr("ThreadInterrupter resuming %p\n",
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reinterpret_cast<void*>(thread->id()));
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}
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}
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void ThreadInterrupter::InstallSignalHandler() {
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// Nothing to do on Windows.
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}
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void ThreadInterrupter::RemoveSignalHandler() {
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// Nothing to do on Windows.
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}
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#endif // !PRODUCT
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} // namespace dart
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#endif // defined(HOST_OS_WINDOWS)
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