This clears the memory used for the Clang AST before we run LLVM passes.
https://llvm-compile-time-tracker.com/compare.php?from=
d0a5f61c4f6fccec87fd5207e3fcd9502dd59854&to=
b7437fee79e04464dd968e1a29185495f3590481&stat=max-rss
shows significant memory savings with no slowdown (in fact -O0 slightly speeds up).
For more background, see
https://lists.llvm.org/pipermail/cfe-dev/2021-September/068930.html.
Turn this off for the interpreter since it does codegen multiple times.
Relanding with fix for -print-stats: D111973
Relanding with fix for plugins: D112190
If you'd like to use this even with plugins, consider using the features
introduced in D112096.
This can be turned off with -Xclang -no-clear-ast-before-backend.
Differential Revision: https://reviews.llvm.org/D111270
// cleanup.
if (!C.isForDiagnostics())
CmdArgs.push_back("-disable-free");
+ CmdArgs.push_back("-clear-ast-before-backend");
#ifdef NDEBUG
const bool IsAssertBuild = false;
Clang->getTarget().adjust(Clang->getDiagnostics(), Clang->getLangOpts());
+ // Don't clear the AST before backend codegen since we do codegen multiple
+ // times, reusing the same AST.
+ Clang->getCodeGenOpts().ClearASTBeforeBackend = false;
+
return std::move(Clang);
}