diff options
| author | Wesley Wiser <wwiser@gmail.com> | 2020-01-31 18:58:28 -0500 |
|---|---|---|
| committer | Wesley Wiser <wwiser@gmail.com> | 2020-02-01 14:19:17 -0500 |
| commit | f5f86be1d40f30b3183ec148f443afa73d0cbe15 (patch) | |
| tree | b502ea8bf896068391dadc47ac11b9f6858fc219 /src/rustllvm/PassWrapper.cpp | |
| parent | cd1ef390e731ed77b90b11b1f77e2c5ca641b261 (diff) | |
| download | rust-f5f86be1d40f30b3183ec148f443afa73d0cbe15.tar.gz rust-f5f86be1d40f30b3183ec148f443afa73d0cbe15.zip | |
Add support for enabling the LLVM time-trace feature
I found this helpful while investigating an LLVM performance issue. Passing `-Z llvm-time-trace` causes a `llvm_timings.json` file to be created. This file can be inspected in either the Chrome Profiler tools or with any other compatible tool like SpeedScope. More information on the LLVM feature: - https://aras-p.info/blog/2019/01/16/time-trace-timeline-flame-chart-profiler-for-Clang/ - https://reviews.llvm.org/rL357340
Diffstat (limited to 'src/rustllvm/PassWrapper.cpp')
| -rw-r--r-- | src/rustllvm/PassWrapper.cpp | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/rustllvm/PassWrapper.cpp b/src/rustllvm/PassWrapper.cpp index fad70369807..4ac7e0e6e1f 100644 --- a/src/rustllvm/PassWrapper.cpp +++ b/src/rustllvm/PassWrapper.cpp @@ -26,6 +26,7 @@ #include "llvm/Transforms/Instrumentation.h" #if LLVM_VERSION_GE(9, 0) #include "llvm/Transforms/Instrumentation/AddressSanitizer.h" +#include "llvm/Support/TimeProfiler.h" #endif #if LLVM_VERSION_GE(8, 0) #include "llvm/Transforms/Instrumentation/ThreadSanitizer.h" @@ -57,6 +58,23 @@ extern "C" void LLVMInitializePasses() { initializeTarget(Registry); } +extern "C" void LLVMTimeTraceProfilerInitialize() { +#if LLVM_VERSION_GE(9, 0) + timeTraceProfilerInitialize(); +#endif +} + +extern "C" void LLVMTimeTraceProfilerFinish(const char* FileName) { +#if LLVM_VERSION_GE(9, 0) + StringRef FN(FileName); + std::error_code EC; + raw_fd_ostream OS(FN, EC, sys::fs::CD_CreateAlways); + + timeTraceProfilerWrite(OS); + timeTraceProfilerCleanup(); +#endif +} + enum class LLVMRustPassKind { Other, Function, |