1 // Copyright 2014 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 #if V8_OS_LINUX
31 #include <fcntl.h>
32 #include <unistd.h>
33 #include "src/third_party/kernel/tools/perf/util/jitdump.h"
34 #endif // V8_OS_LINUX
35
36 namespace v8 {
37 namespace internal {
38
39 #if V8_OS_LINUX
40
41 const char PerfJitLogger::kFilenameFormatString[] = "perfjit-%d.dump";
42
43 // Extra padding for the PID in the filename
44 const int PerfJitLogger::kFilenameBufferPadding = 16;
45
46
PerfJitLogger()47 PerfJitLogger::PerfJitLogger() : perf_output_handle_(NULL), code_index_(0) {
48 if (!base::TimeTicks::KernelTimestampAvailable()) {
49 FATAL("Cannot profile with perf JIT - kernel timestamps not available.");
50 }
51
52 // Open the perf JIT dump file.
53 int bufferSize = sizeof(kFilenameFormatString) + kFilenameBufferPadding;
54 ScopedVector<char> perf_dump_name(bufferSize);
55 int size = SNPrintF(perf_dump_name, kFilenameFormatString,
56 base::OS::GetCurrentProcessId());
57 CHECK_NE(size, -1);
58 perf_output_handle_ =
59 base::OS::FOpen(perf_dump_name.start(), base::OS::LogFileOpenMode);
60 CHECK_NE(perf_output_handle_, NULL);
61 setvbuf(perf_output_handle_, NULL, _IOFBF, kLogBufferSize);
62
63 LogWriteHeader();
64 }
65
66
~PerfJitLogger()67 PerfJitLogger::~PerfJitLogger() {
68 fclose(perf_output_handle_);
69 perf_output_handle_ = NULL;
70 }
71
72
GetTimestamp()73 uint64_t PerfJitLogger::GetTimestamp() {
74 return static_cast<int64_t>(
75 base::TimeTicks::KernelTimestampNow().ToInternalValue());
76 }
77
78
LogRecordedBuffer(Code * code,SharedFunctionInfo *,const char * name,int length)79 void PerfJitLogger::LogRecordedBuffer(Code* code, SharedFunctionInfo*,
80 const char* name, int length) {
81 DCHECK(code->instruction_start() == code->address() + Code::kHeaderSize);
82 DCHECK(perf_output_handle_ != NULL);
83
84 const char* code_name = name;
85 uint8_t* code_pointer = reinterpret_cast<uint8_t*>(code->instruction_start());
86 uint32_t code_size = code->is_crankshafted() ? code->safepoint_table_offset()
87 : code->instruction_size();
88
89 static const char string_terminator[] = "\0";
90
91 jr_code_load code_load;
92 code_load.p.id = JIT_CODE_LOAD;
93 code_load.p.total_size = sizeof(code_load) + length + 1 + code_size;
94 code_load.p.timestamp = GetTimestamp();
95 code_load.pid = static_cast<uint32_t>(base::OS::GetCurrentProcessId());
96 code_load.tid = static_cast<uint32_t>(base::OS::GetCurrentThreadId());
97 code_load.vma = 0x0; // Our addresses are absolute.
98 code_load.code_addr = reinterpret_cast<uint64_t>(code_pointer);
99 code_load.code_size = code_size;
100 code_load.code_index = code_index_;
101
102 code_index_++;
103
104 LogWriteBytes(reinterpret_cast<const char*>(&code_load), sizeof(code_load));
105 LogWriteBytes(code_name, length);
106 LogWriteBytes(string_terminator, 1);
107 LogWriteBytes(reinterpret_cast<const char*>(code_pointer), code_size);
108 }
109
110
CodeMoveEvent(Address from,Address to)111 void PerfJitLogger::CodeMoveEvent(Address from, Address to) {
112 // Code relocation not supported.
113 UNREACHABLE();
114 }
115
116
CodeDeleteEvent(Address from)117 void PerfJitLogger::CodeDeleteEvent(Address from) {
118 // V8 does not send notification on code unload
119 }
120
121
SnapshotPositionEvent(Address addr,int pos)122 void PerfJitLogger::SnapshotPositionEvent(Address addr, int pos) {}
123
124
LogWriteBytes(const char * bytes,int size)125 void PerfJitLogger::LogWriteBytes(const char* bytes, int size) {
126 size_t rv = fwrite(bytes, 1, size, perf_output_handle_);
127 DCHECK(static_cast<size_t>(size) == rv);
128 USE(rv);
129 }
130
131
LogWriteHeader()132 void PerfJitLogger::LogWriteHeader() {
133 DCHECK(perf_output_handle_ != NULL);
134 jitheader header;
135 header.magic = JITHEADER_MAGIC;
136 header.version = JITHEADER_VERSION;
137 header.total_size = sizeof(jitheader);
138 header.pad1 = 0xdeadbeef;
139 header.elf_mach = GetElfMach();
140 header.pid = base::OS::GetCurrentProcessId();
141 header.timestamp =
142 static_cast<uint64_t>(base::OS::TimeCurrentMillis() * 1000.0);
143 LogWriteBytes(reinterpret_cast<const char*>(&header), sizeof(header));
144 }
145
146 #endif // V8_OS_LINUX
147 }
148 } // namespace v8::internal
149