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[clang][cas] Avoid calling freezeConfig for every cache key #9831

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merged 1 commit into from
Jan 15, 2025
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[clang][cas] Avoid calling freezeConfig for every cache key #9831

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19 changes: 17 additions & 2 deletions clang/lib/Frontend/CompileJobCacheKey.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -181,7 +181,10 @@ canonicalizeForCaching(llvm::cas::ObjectStore &CAS, DiagnosticsEngine &Diags,
//
// TODO: Extract CASOptions.Path first if we need it later since it'll
// disappear here.
Invocation.getCASOpts().freezeConfig(Diags);
Invocation.getCASOpts() = {};
// Set the CASPath to the hash schema to match CASOptions::freezeConfig.
Invocation.getCASOpts().CASPath =
CAS.getContext().getHashSchemaIdentifier().str();

// TODO: Canonicalize DiagnosticOptions here to be "serialized" only. Pass in
// a hook to mirror diagnostics to stderr (when writing there), and handle
Expand All @@ -194,8 +197,20 @@ canonicalizeForCaching(llvm::cas::ObjectStore &CAS, DiagnosticsEngine &Diags,
std::optional<llvm::cas::CASID> clang::canonicalizeAndCreateCacheKey(
llvm::cas::ObjectStore &CAS, DiagnosticsEngine &Diags,
CompilerInvocation &Invocation, CompileJobCachingOptions &Opts) {
// Preserve and freeze CASOptions so that we do not modify behaviour of
// Invocation.getCASOpts().getOrCreateDatabases().
CASOptions CASOpts(Invocation.getCASOpts());
CASOpts.freezeConfig(Diags);

Opts = canonicalizeForCaching(CAS, Diags, Invocation);
return createCompileJobCacheKeyImpl(CAS, Diags, Invocation);
auto CacheKey = createCompileJobCacheKeyImpl(CAS, Diags, Invocation);
if (!CacheKey)
return std::nullopt;

assert(Invocation.getCASOpts().CASPath == CASOpts.CASPath &&
"cas instance has incompatible hash with cas options");
Invocation.getCASOpts() = std::move(CASOpts);
return CacheKey;
}

std::optional<llvm::cas::CASID>
Expand Down