Sampling profiler

runtime/vm/signal_handler.cc

Index: runtime/vm/signal_handler.cc
diff --git a/runtime/vm/signal_handler.cc b/runtime/vm/signal_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..752305664096cd5980ea585eaf6fad1b14c80c44
--- /dev/null
+++ b/runtime/vm/signal_handler.cc
@@ -0,0 +1,177 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "platform/utils.h"
+#include "vm/simulator.h"
+#include "vm/signal_handler.h"
+
+namespace dart {
+
+uintptr_t SignalHandler::GetProgramCounter(const mcontext_t& mcontext) {
+  uintptr_t pc = 0;
+
+#if defined(TARGET_OS_MACOS)
+#if defined(TARGET_ARCH_IA32)
+  pc = static_cast<uintptr_t>(mcontext->__ss.__eip);
+#elif defined(TARGET_ARCH_X64)
+  pc = static_cast<uintptr_t>(mcontext->__ss.__rip);
+#elif defined(TARGET_ARCH_MIPS) && defined(USING_SIMULATOR)
+  pc = static_cast<uintptr_t>(mcontext->__ss.__eip);
+#elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
+  pc = static_cast<uintptr_t>(mcontext->__ss.__eip);
+#else
+  UNIMPLEMENTED()
+#endif  // TARGET_ARCH_...
+#endif  // TARGET_OS_MACOS
+
+#if defined(TARGET_OS_LINUX)
+#if defined(TARGET_ARCH_IA32)
+  pc = static_cast<uintptr_t>(mcontext.gregs[REG_EIP]);
+#elif defined(TARGET_ARCH_X64)
+  pc = static_cast<uintptr_t>(mcontext.gregs[REG_RIP]);
+#elif defined(TARGET_ARCH_MIPS) && defined(USING_SIMULATOR)
+  pc = static_cast<uintptr_t>(mcontext.gregs[REG_EIP]);
+#elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
+  pc = static_cast<uintptr_t>(mcontext.gregs[REG_EIP]);
+#else
+  UNIMPLEMENTED()
+#endif  // TARGET_ARCH_...
+#endif  // TARGET_OS_LINUX
+
+#if defined(TARGET_OS_ANDROID)
+  UNIMPLEMENTED();
+#endif  // TARGET_OS_ANDROID
+
+#if defined(TARGET_OS_WINDOWS)
+  UNIMPLEMENTED();
+#endif  // TARGET_OS_WINDOWS
+
+  return pc;
+}
+
+
+uintptr_t SignalHandler::GetFramePointer(const mcontext_t& mcontext) {
+  uintptr_t fp = 0;
+
+#if defined(TARGET_OS_MACOS)
+#if defined(TARGET_ARCH_IA32)
+  fp = static_cast<uintptr_t>(mcontext->__ss.__ebp);
+#elif defined(TARGET_ARCH_X64)
+  fp = static_cast<uintptr_t>(mcontext->__ss.__rbp);
+#elif defined(TARGET_ARCH_MIPS) && defined(USING_SIMULATOR)
+  fp = static_cast<uintptr_t>(mcontext->__ss.__ebp);
+#elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
+  fp = static_cast<uintptr_t>(mcontext->__ss.__ebp);
+#else
+  UNIMPLEMENTED()
+#endif  // TARGET_ARCH_...
+#endif  // TARGET_OS_MACOS
+
+#if defined(TARGET_OS_LINUX)
+#if defined(TARGET_ARCH_IA32)
+  fp = static_cast<uintptr_t>(mcontext.gregs[REG_EBP]);
+#elif defined(TARGET_ARCH_X64)
+  fp = static_cast<uintptr_t>(mcontext.gregs[REG_RBP]);
+#elif defined(TARGET_ARCH_MIPS) && defined(USING_SIMULATOR)
+  fp = static_cast<uintptr_t>(mcontext.gregs[REG_EBP]);
+#elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
+  fp = static_cast<uintptr_t>(mcontext.gregs[REG_EBP]);
+#else
+  UNIMPLEMENTED()
+#endif  // TARGET_ARCH_...
+#endif  // TARGET_OS_LINUX
+
+#if defined(TARGET_OS_ANDROID)
+  UNIMPLEMENTED();
+#endif  // TARGET_OS_ANDROID
+
+#if defined(TARGET_OS_WINDOWS)
+  UNIMPLEMENTED();
+#endif   // TARGET_OS_WINDOWS
+
+  return fp;
+}
+

[siva, 2013/10/28 05:19:21]

Ditto comment about using individual files for each os 

[Cutch, 2013/11/04 20:36:05]

Done.

+
+uintptr_t SignalHandler::GetStackPointer(const mcontext_t& mcontext) {
+  uintptr_t sp = 0;
+
+#if defined(TARGET_OS_MACOS)
+#if defined(TARGET_ARCH_IA32)
+  sp = static_cast<uintptr_t>(mcontext->__ss.__esp);
+#elif defined(TARGET_ARCH_X64)
+  sp = static_cast<uintptr_t>(mcontext->__ss.__rsp);
+#elif defined(TARGET_ARCH_MIPS) && defined(USING_SIMULATOR)
+  sp = static_cast<uintptr_t>(mcontext->__ss.__esp);
+#elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
+  sp = static_cast<uintptr_t>(mcontext->__ss.__esp);
+#else
+  UNIMPLEMENTED()
+#endif  // TARGET_ARCH_...
+#endif  // TARGET_OS_MACOS
+
+#if defined(TARGET_OS_LINUX)
+#if defined(TARGET_ARCH_IA32)
+  sp = static_cast<uintptr_t>(mcontext.gregs[REG_ESP]);
+#elif defined(TARGET_ARCH_X64)
+  sp = static_cast<uintptr_t>(mcontext.gregs[REG_RSP]);
+#elif defined(TARGET_ARCH_MIPS) && defined(USING_SIMULATOR)
+  sp = static_cast<uintptr_t>(mcontext.gregs[REG_ESP]);
+#elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
+  sp = static_cast<uintptr_t>(mcontext.gregs[REG_ESP]);
+#else
+  UNIMPLEMENTED()
+#endif  // TARGET_ARCH_...
+#endif  // TARGET_OS_LINUX
+
+#if defined(TARGET_OS_WINDOWS)
+  UNIMPLEMENTED();
+#endif   // TARGET_OS_WINDOWS
+
+#if defined(TARGET_OS_ANDROID)
+  UNIMPLEMENTED();
+#endif  // TARGET_OS_ANDROID
+  return sp;
+}
+
+
+void SignalHandler::Install(SignalAction action) {
+#if defined(TARGET_OS_WINDOWS)
+  UNIMPLEMENTED();
+#else
+  struct sigaction act;
+  act.sa_handler = NULL;
+  act.sa_sigaction = action;
+  sigemptyset(&act.sa_mask);
+  act.sa_flags = SA_RESTART | SA_SIGINFO;
+  // TODO(johnmccutchan): Do we care about restoring the signal handler?
+  struct sigaction old_act;
+  int r = sigaction(SIGPROF, &act, &old_act);
+  ASSERT(r == 0);
+#endif
+}
+
+
+ScopedSignalBlocker::ScopedSignalBlocker() {
+#if defined(TARGET_OS_WINDOWS)
+  // NOOP.
+#else
+  sigset_t set;
+  sigemptyset(&set);
+  sigaddset(&set, SIGPROF);
+  pthread_sigmask(SIG_SETMASK, &set, &old_);
+#endif
+}
+
+
+ScopedSignalBlocker::~ScopedSignalBlocker() {
+#if defined(TARGET_OS_WINDOWS)
+  // NOOP.
+#else
+  pthread_sigmask(SIG_SETMASK, &old_, NULL);
+#endif
+}
+
+
+}  // namespace dart