Commit 2737dfca authored by Zhou, Zhiguo's avatar Zhou, Zhiguo Committed by Commit Bot

Log debug info of WASM for Linux Perf tool

This CL adds an overloaded function PerfJitLogger::LogWriteDebugInfo
for writing JIT_DEBUG_INFO record into jitdump file. With this CL,
perf-annotate can display profiling information of JITted code with
the corresponding source code interleaved.

Change-Id: Ie1271e08b69712c81129335825467d83674d7938
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1672531Reviewed-by: 's avatarClemens Hammacher <clemensh@chromium.org>
Commit-Queue: Zhiguo Zhou <zhiguo.zhou@intel.com>
Cr-Commit-Position: refs/heads/master@{#63539}
parent cabe5fa9
......@@ -243,6 +243,10 @@ void PerfJitLogger::LogRecordedBuffer(const wasm::WasmCode* code,
if (perf_output_handle_ == nullptr) return;
if (FLAG_perf_prof_annotate_wasm) {
LogWriteDebugInfo(code);
}
WriteJitCodeLoadEntry(code->instructions().begin(),
code->instructions().length(), name, length);
}
......@@ -387,6 +391,73 @@ void PerfJitLogger::LogWriteDebugInfo(Code code, SharedFunctionInfo shared) {
LogWriteBytes(padding_bytes, padding);
}
void PerfJitLogger::LogWriteDebugInfo(const wasm::WasmCode* code) {
wasm::WasmModuleSourceMap* source_map =
code->native_module()->GetWasmSourceMap();
wasm::WireBytesRef code_ref =
code->native_module()->module()->functions[code->index()].code;
uint32_t code_offset = code_ref.offset();
uint32_t code_end_offset = code_ref.end_offset();
uint32_t entry_count = 0;
uint32_t size = 0;
if (!source_map || !source_map->IsValid() ||
!source_map->HasSource(code_offset, code_end_offset)) {
return;
}
for (SourcePositionTableIterator iterator(code->source_positions());
!iterator.done(); iterator.Advance()) {
uint32_t offset = iterator.source_position().ScriptOffset() + code_offset;
if (!source_map->HasValidEntry(code_offset, offset)) continue;
entry_count++;
size += source_map->GetFilename(offset).size() + 1;
}
if (entry_count == 0) return;
PerfJitCodeDebugInfo debug_info;
debug_info.event_ = PerfJitCodeLoad::kDebugInfo;
debug_info.time_stamp_ = GetTimestamp();
debug_info.address_ =
reinterpret_cast<uintptr_t>(code->instructions().begin());
debug_info.entry_count_ = entry_count;
size += sizeof(debug_info);
// Add the sizes of fixed parts of entries.
size += entry_count * sizeof(PerfJitDebugEntry);
int padding = ((size + 7) & (~7)) - size;
debug_info.size_ = size + padding;
LogWriteBytes(reinterpret_cast<const char*>(&debug_info), sizeof(debug_info));
uintptr_t code_begin =
reinterpret_cast<uintptr_t>(code->instructions().begin());
for (SourcePositionTableIterator iterator(code->source_positions());
!iterator.done(); iterator.Advance()) {
uint32_t offset = iterator.source_position().ScriptOffset() + code_offset;
if (!source_map->HasValidEntry(code_offset, offset)) continue;
PerfJitDebugEntry entry;
// The entry point of the function will be placed straight after the ELF
// header when processed by "perf inject". Adjust the position addresses
// accordingly.
entry.address_ = code_begin + iterator.code_offset() + kElfHeaderSize;
entry.line_number_ =
static_cast<int>(source_map->GetSourceLine(offset)) + 1;
entry.column_ = 1;
LogWriteBytes(reinterpret_cast<const char*>(&entry), sizeof(entry));
std::string name_string = source_map->GetFilename(offset);
LogWriteBytes(name_string.c_str(),
static_cast<int>(name_string.size() + 1));
}
char padding_bytes[8] = {0};
LogWriteBytes(padding_bytes, padding);
}
void PerfJitLogger::LogWriteUnwindingInfo(Code code) {
PerfJitCodeUnwindingInfo unwinding_info_header;
unwinding_info_header.event_ = PerfJitCodeLoad::kUnwindingInfo;
......
......@@ -71,6 +71,7 @@ class PerfJitLogger : public CodeEventLogger {
void LogWriteBytes(const char* bytes, int size);
void LogWriteHeader();
void LogWriteDebugInfo(Code code, SharedFunctionInfo shared);
void LogWriteDebugInfo(const wasm::WasmCode* code);
void LogWriteUnwindingInfo(Code code);
static const uint32_t kElfMachIA32 = 3;
......
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