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| 1 // Copyright 2016 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are |
| 4 // met: |
| 5 // |
| 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided |
| 11 // with the distribution. |
| 12 // * Neither the name of Google Inc. nor the names of its |
| 13 // contributors may be used to endorse or promote products derived |
| 14 // from this software without specific prior written permission. |
| 15 // |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 |
| 28 #include "src/perf-jit.h" |
| 29 |
| 30 #include "src/assembler.h" |
| 31 #include "src/objects-inl.h" |
| 32 |
| 33 #if V8_OS_LINUX |
| 34 #include <fcntl.h> |
| 35 #include <sys/mman.h> |
| 36 #include <unistd.h> |
| 37 #endif // V8_OS_LINUX |
| 38 |
| 39 namespace v8 { |
| 40 namespace internal { |
| 41 |
| 42 #if V8_OS_LINUX |
| 43 |
| 44 struct PerfJitHeader { |
| 45 uint32_t magic_; |
| 46 uint32_t version_; |
| 47 uint32_t size_; |
| 48 uint32_t elf_mach_target_; |
| 49 uint32_t reserved_; |
| 50 uint32_t process_id_; |
| 51 uint64_t time_stamp_; |
| 52 uint64_t flags_; |
| 53 |
| 54 static const uint32_t kMagic = 0x4A695444; |
| 55 static const uint32_t kVersion = 1; |
| 56 }; |
| 57 |
| 58 struct PerfJitBase { |
| 59 enum PerfJitEvent { kLoad = 0, kMove = 1, kDebugInfo = 2, kClose = 3 }; |
| 60 |
| 61 uint32_t event_; |
| 62 uint32_t size_; |
| 63 uint64_t time_stamp_; |
| 64 }; |
| 65 |
| 66 struct PerfJitCodeLoad : PerfJitBase { |
| 67 uint32_t process_id_; |
| 68 uint32_t thread_id_; |
| 69 uint64_t vma_; |
| 70 uint64_t code_address_; |
| 71 uint64_t code_size_; |
| 72 uint64_t code_id_; |
| 73 }; |
| 74 |
| 75 struct PerfJitDebugEntry { |
| 76 uint64_t address_; |
| 77 int line_number_; |
| 78 int column_; |
| 79 // Followed by null-terminated name or \0xff\0 if same as previous. |
| 80 }; |
| 81 |
| 82 struct PerfJitCodeDebugInfo : PerfJitBase { |
| 83 uint64_t address_; |
| 84 uint64_t entry_count_; |
| 85 // Followed by entry_count_ instances of PerfJitDebugEntry. |
| 86 }; |
| 87 |
| 88 const char PerfJitLogger::kFilenameFormatString[] = "./jit-%d.dump"; |
| 89 |
| 90 // Extra padding for the PID in the filename |
| 91 const int PerfJitLogger::kFilenameBufferPadding = 16; |
| 92 |
| 93 void PerfJitLogger::OpenJitDumpFile() { |
| 94 // Open the perf JIT dump file. |
| 95 perf_output_handle_ = nullptr; |
| 96 |
| 97 int bufferSize = sizeof(kFilenameFormatString) + kFilenameBufferPadding; |
| 98 ScopedVector<char> perf_dump_name(bufferSize); |
| 99 int size = SNPrintF(perf_dump_name, kFilenameFormatString, |
| 100 base::OS::GetCurrentProcessId()); |
| 101 CHECK_NE(size, -1); |
| 102 |
| 103 int fd = open(perf_dump_name.start(), O_CREAT | O_TRUNC | O_RDWR, 0666); |
| 104 if (fd == -1) return; |
| 105 |
| 106 marker_address_ = OpenMarkerFile(fd); |
| 107 if (marker_address_ == nullptr) return; |
| 108 |
| 109 perf_output_handle_ = fdopen(fd, "w+"); |
| 110 if (perf_output_handle_ == nullptr) return; |
| 111 |
| 112 setvbuf(perf_output_handle_, NULL, _IOFBF, kLogBufferSize); |
| 113 } |
| 114 |
| 115 void PerfJitLogger::CloseJitDumpFile() { |
| 116 if (perf_output_handle_ == nullptr) return; |
| 117 fclose(perf_output_handle_); |
| 118 perf_output_handle_ = nullptr; |
| 119 } |
| 120 |
| 121 void* PerfJitLogger::OpenMarkerFile(int fd) { |
| 122 long page_size = sysconf(_SC_PAGESIZE); // NOLINT(runtime/int) |
| 123 if (page_size == -1) return nullptr; |
| 124 |
| 125 // Mmap the file so that there is a mmap record in the perf_data file. |
| 126 // |
| 127 // The map must be PROT_EXEC to ensure it is not ignored by perf record. |
| 128 void* marker_address = |
| 129 mmap(nullptr, page_size, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0); |
| 130 return (marker_address == MAP_FAILED) ? nullptr : marker_address; |
| 131 } |
| 132 |
| 133 void PerfJitLogger::CloseMarkerFile(void* marker_address) { |
| 134 if (marker_address == nullptr) return; |
| 135 long page_size = sysconf(_SC_PAGESIZE); // NOLINT(runtime/int) |
| 136 if (page_size == -1) return; |
| 137 munmap(marker_address, page_size); |
| 138 } |
| 139 |
| 140 PerfJitLogger::PerfJitLogger() |
| 141 : perf_output_handle_(nullptr), code_index_(0), marker_address_(nullptr) { |
| 142 OpenJitDumpFile(); |
| 143 if (perf_output_handle_ == nullptr) return; |
| 144 LogWriteHeader(); |
| 145 } |
| 146 |
| 147 PerfJitLogger::~PerfJitLogger() { CloseJitDumpFile(); } |
| 148 |
| 149 uint64_t PerfJitLogger::GetTimestamp() { |
| 150 struct timespec ts; |
| 151 int result = clock_gettime(CLOCK_MONOTONIC, &ts); |
| 152 DCHECK_EQ(0, result); |
| 153 USE(result); |
| 154 static const uint64_t kNsecPerSec = 1000000000; |
| 155 return (ts.tv_sec * kNsecPerSec) + ts.tv_nsec; |
| 156 } |
| 157 |
| 158 void PerfJitLogger::LogRecordedBuffer(AbstractCode* abstract_code, |
| 159 SharedFunctionInfo* shared, |
| 160 const char* name, int length) { |
| 161 if (perf_output_handle_ == nullptr) return; |
| 162 if (FLAG_perf_basic_prof_only_functions && |
| 163 (abstract_code->kind() != AbstractCode::FUNCTION && |
| 164 abstract_code->kind() != AbstractCode::INTERPRETED_FUNCTION && |
| 165 abstract_code->kind() != AbstractCode::OPTIMIZED_FUNCTION)) { |
| 166 return; |
| 167 } |
| 168 |
| 169 // We only support non-interpreted functions. |
| 170 if (!abstract_code->IsCode()) return; |
| 171 Code* code = abstract_code->GetCode(); |
| 172 DCHECK(code->instruction_start() == code->address() + Code::kHeaderSize); |
| 173 |
| 174 const char* code_name = name; |
| 175 uint8_t* code_pointer = reinterpret_cast<uint8_t*>(code->instruction_start()); |
| 176 uint32_t code_size = code->is_crankshafted() ? code->safepoint_table_offset() |
| 177 : code->instruction_size(); |
| 178 |
| 179 static const char string_terminator[] = "\0"; |
| 180 |
| 181 PerfJitCodeLoad code_load; |
| 182 code_load.event_ = PerfJitCodeLoad::kLoad; |
| 183 code_load.size_ = sizeof(code_load) + length + 1 + code_size; |
| 184 code_load.time_stamp_ = GetTimestamp(); |
| 185 code_load.process_id_ = |
| 186 static_cast<uint32_t>(base::OS::GetCurrentProcessId()); |
| 187 code_load.thread_id_ = static_cast<uint32_t>(base::OS::GetCurrentThreadId()); |
| 188 code_load.vma_ = 0x0; // Our addresses are absolute. |
| 189 code_load.code_address_ = reinterpret_cast<uint64_t>(code_pointer); |
| 190 code_load.code_size_ = code_size; |
| 191 code_load.code_id_ = code_index_; |
| 192 |
| 193 code_index_++; |
| 194 |
| 195 LogWriteBytes(reinterpret_cast<const char*>(&code_load), sizeof(code_load)); |
| 196 LogWriteBytes(code_name, length); |
| 197 LogWriteBytes(string_terminator, 1); |
| 198 LogWriteBytes(reinterpret_cast<const char*>(code_pointer), code_size); |
| 199 |
| 200 if (FLAG_perf_prof_debug_info) { |
| 201 LogWriteDebugInfo(code, shared); |
| 202 } |
| 203 } |
| 204 |
| 205 void PerfJitLogger::LogWriteDebugInfo(Code* code, SharedFunctionInfo* shared) { |
| 206 // Compute the entry count and get the name of the script. |
| 207 uint32_t entry_count = 0; |
| 208 for (RelocIterator it(code, RelocInfo::kPositionMask); !it.done(); |
| 209 it.next()) { |
| 210 entry_count++; |
| 211 } |
| 212 if (entry_count == 0) return; |
| 213 Handle<Script> script(Script::cast(shared->script())); |
| 214 Handle<Object> name_or_url(Script::GetNameOrSourceURL(script)); |
| 215 |
| 216 int name_length = 0; |
| 217 base::SmartArrayPointer<char> name_string; |
| 218 if (name_or_url->IsString()) { |
| 219 name_string = |
| 220 Handle<String>::cast(name_or_url) |
| 221 ->ToCString(DISALLOW_NULLS, FAST_STRING_TRAVERSAL, &name_length); |
| 222 DCHECK_EQ(0, name_string.get()[name_length]); |
| 223 } else { |
| 224 const char unknown[] = "<unknown>"; |
| 225 name_length = static_cast<int>(strlen(unknown)); |
| 226 char* buffer = NewArray<char>(name_length); |
| 227 base::OS::StrNCpy(buffer, name_length + 1, unknown, |
| 228 static_cast<size_t>(name_length)); |
| 229 name_string = base::SmartArrayPointer<char>(buffer); |
| 230 } |
| 231 DCHECK_EQ(name_length, strlen(name_string.get())); |
| 232 |
| 233 PerfJitCodeDebugInfo debug_info; |
| 234 |
| 235 debug_info.event_ = PerfJitCodeLoad::kDebugInfo; |
| 236 debug_info.time_stamp_ = GetTimestamp(); |
| 237 debug_info.address_ = reinterpret_cast<uint64_t>(code->instruction_start()); |
| 238 debug_info.entry_count_ = entry_count; |
| 239 |
| 240 uint32_t size = sizeof(debug_info); |
| 241 // Add the sizes of fixed parts of entries. |
| 242 size += entry_count * sizeof(PerfJitDebugEntry); |
| 243 // Add the size of the name after the first entry. |
| 244 size += static_cast<uint32_t>(name_length) + 1; |
| 245 // Add the sizes of the links to previous name (\0xff\0). |
| 246 size += (entry_count - 1) * 2; |
| 247 |
| 248 int padding = ((size + 7) & (~7)) - size; |
| 249 |
| 250 debug_info.size_ = size + padding; |
| 251 |
| 252 LogWriteBytes(reinterpret_cast<const char*>(&debug_info), sizeof(debug_info)); |
| 253 |
| 254 int script_line_offset = script->line_offset(); |
| 255 Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends())); |
| 256 |
| 257 bool is_first = true; |
| 258 for (RelocIterator it(code, RelocInfo::kPositionMask); !it.done(); |
| 259 it.next()) { |
| 260 int position = static_cast<int>(it.rinfo()->data()); |
| 261 int line_number = Script::GetLineNumber(script, position); |
| 262 // Compute column. |
| 263 int relative_line_number = line_number - script_line_offset; |
| 264 int start = |
| 265 (relative_line_number == 0) |
| 266 ? 0 |
| 267 : Smi::cast(line_ends->get(relative_line_number - 1))->value() + 1; |
| 268 int column_offset = position - start; |
| 269 if (relative_line_number == 0) { |
| 270 // For the case where the code is on the same line as the script tag. |
| 271 column_offset += script->column_offset(); |
| 272 } |
| 273 |
| 274 PerfJitDebugEntry entry; |
| 275 entry.address_ = reinterpret_cast<uint64_t>(it.rinfo()->pc()); |
| 276 entry.line_number_ = line_number; |
| 277 entry.column_ = column_offset; |
| 278 LogWriteBytes(reinterpret_cast<const char*>(&entry), sizeof(entry)); |
| 279 |
| 280 if (is_first) { |
| 281 is_first = false; |
| 282 LogWriteBytes(name_string.get(), name_length + 1); |
| 283 } else { |
| 284 LogWriteBytes("\xff", 2); |
| 285 } |
| 286 } |
| 287 char padding_bytes[] = "\0\0\0\0\0\0\0\0"; |
| 288 LogWriteBytes(padding_bytes, padding); |
| 289 } |
| 290 |
| 291 void PerfJitLogger::CodeMoveEvent(AbstractCode* from, Address to) { |
| 292 // Code relocation not supported. |
| 293 UNREACHABLE(); |
| 294 } |
| 295 |
| 296 void PerfJitLogger::LogWriteBytes(const char* bytes, int size) { |
| 297 size_t rv = fwrite(bytes, 1, size, perf_output_handle_); |
| 298 DCHECK(static_cast<size_t>(size) == rv); |
| 299 USE(rv); |
| 300 } |
| 301 |
| 302 void PerfJitLogger::LogWriteHeader() { |
| 303 DCHECK(perf_output_handle_ != NULL); |
| 304 PerfJitHeader header; |
| 305 |
| 306 header.magic_ = PerfJitHeader::kMagic; |
| 307 header.version_ = PerfJitHeader::kVersion; |
| 308 header.size_ = sizeof(header); |
| 309 header.elf_mach_target_ = GetElfMach(); |
| 310 header.reserved_ = 0xdeadbeef; |
| 311 header.process_id_ = base::OS::GetCurrentProcessId(); |
| 312 header.time_stamp_ = |
| 313 static_cast<uint64_t>(base::OS::TimeCurrentMillis() * 1000.0); |
| 314 header.flags_ = 0; |
| 315 |
| 316 LogWriteBytes(reinterpret_cast<const char*>(&header), sizeof(header)); |
| 317 } |
| 318 |
| 319 #endif // V8_OS_LINUX |
| 320 } // namespace internal |
| 321 } // namespace v8 |
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