Linux perf support update.

src/perf-jit.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifdef __linux__
+#include <fcntl.h>
+#include "src/third_party/kernel/tools/perf/util/jitdump.h"
+#endif
+
+#include "src/perf-jit.h"
+
+
+namespace v8 {
+namespace internal {
+
+#ifdef __linux__
+
+const char PerfJitLogger::kFilenameFormatString[] = "perfjit.dump";
+
+// Timestamp module name
+const char PerfJitLogger::kTraceClockDevice[] = "/dev/trace_clock";
+
+// Extra padding for the PID in the filename
+const int PerfJitLogger::kFilenameBufferPadding = 16;
+
+
+static clockid_t get_clockid(int fd) {
+  return ((~(clockid_t) (fd) << 3) | 3);
+}
+
+
+PerfJitLogger::PerfJitLogger()
+    : perf_output_handle_(NULL),
+      code_index_(0) {
+  // Open the perf JIT dump file.
+  int bufferSize = sizeof(kFilenameFormatString) + kFilenameBufferPadding;
+  ScopedVector<char> perf_dump_name(bufferSize);
+  int size = SNPrintF(
+      perf_dump_name,
+      kFilenameFormatString,
+      base::OS::GetCurrentProcessId());
+  CHECK_NE(size, -1);
+  perf_output_handle_ = base::OS::FOpen(perf_dump_name.start(),
+                                        base::OS::LogFileOpenMode);
+  CHECK_NE(perf_output_handle_, NULL);
+  setvbuf(perf_output_handle_, NULL, _IOFBF, kLogBufferSize);
+  clock_fd_ = open(kTraceClockDevice, O_RDONLY);
+  if (clock_fd_ ==  -1) {
+    FATAL("Could not get perf timestamp clock");
+  }
+  clock_id_ = get_clockid(clock_fd_);
+  if (kClockInvalid == clock_id_) {
+    FATAL("Could not get perf timestamp clock");
+  }
+
+  LogWriteHeader();
+}
+
+
+PerfJitLogger::~PerfJitLogger() {
+  fclose(perf_output_handle_);
+  close(clock_fd_);
+  perf_output_handle_ = NULL;
+}
+
+
+uint64_t PerfJitLogger::GetTimestamp() {
+  struct timespec ts;
+
+  clock_gettime(clock_id_, &ts);
+  return ((uint64_t) ts.tv_sec * kNsecPerSec) + ts.tv_nsec;
+}
+
+
+void PerfJitLogger::LogRecordedBuffer(Code* code,
+                                      SharedFunctionInfo*,
+                                      const char* name,
+                                      int length) {
+  ASSERT(code->instruction_start() == code->address() + Code::kHeaderSize);
+  ASSERT(perf_output_handle_ != NULL);
+
+  const char* code_name = name;
+  uint8_t* code_pointer = reinterpret_cast<uint8_t*>(code->instruction_start());
+  uint32_t code_size = code->instruction_size();
+
+  static const char string_terminator[] = "\0";
+
+  jr_code_load code_load;
+  code_load.p.id = JIT_CODE_LOAD;
+  code_load.p.total_size = sizeof(code_load) + length + 1 + code_size;
+  code_load.p.timestamp = GetTimestamp();
+  code_load.pid = static_cast<uint32_t>(base::OS::GetCurrentProcessId());
+  code_load.tid = static_cast<uint32_t>(base::OS::GetCurrentThreadId());
+  code_load.vma = 0x0;  //  Our addresses are absolute.
+  code_load.code_addr = reinterpret_cast<uint64_t>(code_pointer);
+  code_load.code_size = code_size;
+  code_load.code_index = code_index_;
+
+  code_index_++;
+
+  LogWriteBytes(reinterpret_cast<const char*>(&code_load), sizeof(code_load));
+  LogWriteBytes(code_name, length);
+  LogWriteBytes(string_terminator, 1);
+  LogWriteBytes(reinterpret_cast<const char*>(code_pointer), code_size);
+}
+
+
+void PerfJitLogger::CodeMoveEvent(Address from, Address to) {
+  // Code relocation not supported.
+  UNREACHABLE();
+}
+
+
+void PerfJitLogger::CodeDeleteEvent(Address from) {
+  // V8 does not send notification on code unload
+}
+
+
+void PerfJitLogger::SnapshotPositionEvent(Address addr, int pos) {
+}
+
+
+void PerfJitLogger::LogWriteBytes(const char* bytes, int size) {
+  size_t rv = fwrite(bytes, 1, size, perf_output_handle_);
+  ASSERT(static_cast<size_t>(size) == rv);
+  USE(rv);
+}
+
+
+void PerfJitLogger::LogWriteHeader() {
+  ASSERT(perf_output_handle_ != NULL);
+  jitheader header;
+  header.magic = JITHEADER_MAGIC;
+  header.version = JITHEADER_VERSION;
+  header.total_size = sizeof(jitheader);
+  header.pad1 = 0xdeadbeef;
+  header.elf_mach = GetElfMach();
+  header.pid = base::OS::GetCurrentProcessId();
+  header.timestamp =
+      static_cast<uint64_t>(base::OS::TimeCurrentMillis() * 1000.0);
+  LogWriteBytes(reinterpret_cast<const char*>(&header), sizeof(header));
+}
+
+#endif  // defined(__linux__)
+
+} }   // namespace v8::internal