Remove the experimental perf jit support until the license is clarified.

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.
-
-#include "src/perf-jit.h"
-
-#if V8_OS_LINUX
-#include <fcntl.h>
-#include <unistd.h>
-#include "src/third_party/kernel/tools/perf/util/jitdump.h"
-#endif  // V8_OS_LINUX
-
-namespace v8 {
-namespace internal {
-
-#if V8_OS_LINUX
-
-const char PerfJitLogger::kFilenameFormatString[] = "perfjit-%d.dump";
-
-// Extra padding for the PID in the filename
-const int PerfJitLogger::kFilenameBufferPadding = 16;
-
-
-PerfJitLogger::PerfJitLogger() : perf_output_handle_(NULL), code_index_(0) {
-  if (!base::TimeTicks::KernelTimestampAvailable()) {
-    FATAL("Cannot profile with perf JIT - kernel timestamps not available.");
-  }
-
-  // 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_NOT_NULL(perf_output_handle_);
-  setvbuf(perf_output_handle_, NULL, _IOFBF, kLogBufferSize);
-
-  LogWriteHeader();
-}
-
-
-PerfJitLogger::~PerfJitLogger() {
-  fclose(perf_output_handle_);
-  perf_output_handle_ = NULL;
-}
-
-
-uint64_t PerfJitLogger::GetTimestamp() {
-  return static_cast<int64_t>(
-      base::TimeTicks::KernelTimestampNow().ToInternalValue());
-}
-
-
-void PerfJitLogger::LogRecordedBuffer(Code* code, SharedFunctionInfo*,
-                                      const char* name, int length) {
-  DCHECK(code->instruction_start() == code->address() + Code::kHeaderSize);
-  DCHECK(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->is_crankshafted() ? code->safepoint_table_offset()
-                                               : 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_);
-  DCHECK(static_cast<size_t>(size) == rv);
-  USE(rv);
-}
-
-
-void PerfJitLogger::LogWriteHeader() {
-  DCHECK(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  // V8_OS_LINUX
-}
-}  // namespace v8::internal