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Merge pull request #31146 from kateinoigakukun/katei/enable-lang-agnostic-lto

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[LTO] Support LLVM level link time optimization on Darwin, Linux and Windows
This commit is contained in:
Saleem Abdulrasool
2020-06-05 11:38:09 -07:00
committed by GitHub
parent b996a21d08 915c4a6997
commit d0131ba6be
23 changed files with 255 additions and 35 deletions
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27
lib/IRGen/IRGenModule.cpp
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@@ -1098,10 +1098,18 @@ void IRGenModule::addLinkLibrary(const LinkLibrary &linkLib) {
switch (linkLib.getKind()) {
case LibraryKind::Library: {
llvm::SmallString<32> opt =
getTargetDependentLibraryOption(Triple, linkLib.getName());
AutolinkEntries.push_back(
llvm::MDNode::get(ctx, llvm::MDString::get(ctx, opt)));
if (TargetInfo.OutputObjectFormat == llvm::Triple::ELF && IRGen.Opts.LLVMLTOKind != IRGenLLVMLTOKind::None) {
// When performing LTO, we always use lld that supports auto linking mechanism with ELF.
// So embed dependent libraries names in "llvm.dependent-libraries" instead of options
// to avoid using swift-autolink-extract.
AutolinkEntries.push_back(
llvm::MDNode::get(ctx, llvm::MDString::get(ctx, linkLib.getName())));
} else {
llvm::SmallString<32> opt =
getTargetDependentLibraryOption(Triple, linkLib.getName());
AutolinkEntries.push_back(
llvm::MDNode::get(ctx, llvm::MDString::get(ctx, opt)));
}
break;
}
case LibraryKind::Framework: {
@@ -1188,7 +1196,12 @@ static bool isFirstObjectFileInModule(IRGenModule &IGM) {
void IRGenModule::emitAutolinkInfo() {
// Collect the linker options already in the module (from ClangCodeGen).
// FIXME: This constant should be vended by LLVM somewhere.
auto *Metadata = Module.getOrInsertNamedMetadata("llvm.linker.options");
// When performing LTO, we always use lld that supports auto linking mechanism with ELF.
// So embed dependent libraries names in "llvm.dependent-libraries" instead of "llvm.linker.options".
const StringRef AutolinkSectionName =
TargetInfo.OutputObjectFormat == llvm::Triple::ELF && IRGen.Opts.LLVMLTOKind != IRGenLLVMLTOKind::None
? "llvm.dependent-libraries" : "llvm.linker.options";
auto *Metadata = Module.getOrInsertNamedMetadata(AutolinkSectionName);
for (llvm::MDNode *LinkOption : Metadata->operands())
AutolinkEntries.push_back(LinkOption);
@@ -1203,9 +1216,9 @@ void IRGenModule::emitAutolinkInfo() {
AutolinkEntries.end());
const bool AutolinkExtractRequired =
(TargetInfo.OutputObjectFormat == llvm::Triple::ELF && !Triple.isPS4()) ||
((TargetInfo.OutputObjectFormat == llvm::Triple::ELF && !Triple.isPS4()) ||
TargetInfo.OutputObjectFormat == llvm::Triple::Wasm ||
Triple.isOSCygMing();
Triple.isOSCygMing()) && IRGen.Opts.LLVMLTOKind == IRGenLLVMLTOKind::None;
if (!AutolinkExtractRequired) {
// On platforms that support autolinking, continue to use the metadata.