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Rollup merge of #130477 - tmandry:revert-llvm-20-lto, r=tmandry

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Revert #129749 to fix segfault in LLVM

This reverts commit 8c7a7e346b, reversing changes made to a00bd75b6c.

Reported in https://github.com/rust-lang/rust/pull/129749#issuecomment-2354417960. `@nikic's` theory is that the LLVM API changed in a way that makes it impossible to use concurrently from multiple threads (https://github.com/llvm/llvm-project/pull/106427#issuecomment-2354783802). I pinged `@krasimirgg` who was fine with reverting.

r? `@rust-lang/wg-llvm`
This commit is contained in:
Matthias Krüger 2024-09-17 20:45:51 +02:00 committed by GitHub
commit f8090dda64
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1 changed files with 3 additions and 7 deletions
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10
compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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@ -1211,11 +1211,7 @@ struct LLVMRustThinLTOData {
// Not 100% sure what these are, but they impact what's internalized and
// what's inlined across modules, I believe.
#if LLVM_VERSION_GE(18, 0)
#if LLVM_VERSION_GE(20, 0)
FunctionImporter::ImportListsTy ImportLists;
#else
DenseMap<StringRef, FunctionImporter::ImportMapTy> ImportLists;
#endif
DenseMap<StringRef, FunctionImporter::ExportSetTy> ExportLists;
DenseMap<StringRef, GVSummaryMapTy> ModuleToDefinedGVSummaries;
#else
@ -1424,13 +1420,13 @@ LLVMRustPrepareThinLTOInternalize(const LLVMRustThinLTOData *Data,
return true;
}
extern "C" bool LLVMRustPrepareThinLTOImport(LLVMRustThinLTOData *Data,
extern "C" bool LLVMRustPrepareThinLTOImport(const LLVMRustThinLTOData *Data,
LLVMModuleRef M,
LLVMTargetMachineRef TM) {
Module &Mod = *unwrap(M);
TargetMachine &Target = *unwrap(TM);
const auto &ImportList = Data->ImportLists[Mod.getModuleIdentifier()];
const auto &ImportList = Data->ImportLists.lookup(Mod.getModuleIdentifier());
auto Loader = [&](StringRef Identifier) {
const auto &Memory = Data->ModuleMap.lookup(Identifier);
auto &Context = Mod.getContext();
@ -1613,7 +1609,7 @@ extern "C" void LLVMRustComputeLTOCacheKey(RustStringRef KeyOut,
LLVMRustThinLTOData *Data) {
SmallString<40> Key;
llvm::lto::Config conf;
const auto &ImportList = Data->ImportLists[ModId];
const auto &ImportList = Data->ImportLists.lookup(ModId);
const auto &ExportList = Data->ExportLists.lookup(ModId);
const auto &ResolvedODR = Data->ResolvedODR.lookup(ModId);
const auto &DefinedGlobals = Data->ModuleToDefinedGVSummaries.lookup(ModId);