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filter LLVM diagnostics before crossing the rust bridge

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this will eliminate many short-lived allocations (e.g. 20% of the memory used
building cargo) when unpacking the diagnostic and converting its various
C++ strings into rust strings, just to be filtered out most of the time.
This commit is contained in:
Rémy Rakic 2023-07-14 14:26:15 +00:00
parent 598acffa60
commit 77d01103a3
1 changed files with 10 additions and 3 deletions
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13
compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
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@ -1905,12 +1905,19 @@ extern "C" void LLVMRustContextConfigureDiagnosticHandler(
LlvmRemarkStreamer(std::move(LlvmRemarkStreamer)) {}
virtual bool handleDiagnostics(const DiagnosticInfo &DI) override {
if (this->LlvmRemarkStreamer) {
if (auto *OptDiagBase = dyn_cast<DiagnosticInfoOptimizationBase>(&DI)) {
if (OptDiagBase->isEnabled()) {
// If this diagnostic is one of the optimization remark kinds, we can check if it's enabled
// before emitting it. This can avoid many short-lived allocations when unpacking the
// diagnostic and converting its various C++ strings into rust strings.
// FIXME: some diagnostic infos still allocate before we get here, and avoiding that would be
// good in the future. That will require changing a few call sites in LLVM.
if (auto *OptDiagBase = dyn_cast<DiagnosticInfoOptimizationBase>(&DI)) {
if (OptDiagBase->isEnabled()) {
if (this->LlvmRemarkStreamer) {
this->LlvmRemarkStreamer->emit(*OptDiagBase);
return true;
}
} else {
return true;
}
}
if (DiagnosticHandlerCallback) {