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Embed autolink entries for ELF as globals.

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Swift SVN r25509
This commit is contained in:
Graham Batty
2015-02-24 20:33:00 +00:00
parent cadd851e1b
commit 49548aee09
1 changed files with 40 additions and 6 deletions
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46
lib/IRGen/IRGenModule.cpp
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@@ -512,9 +512,6 @@ static int pointerPODSortComparator(T * const *lhs, T * const *rhs) {
}
void IRGenModule::emitAutolinkInfo() {
// FIXME: This constant should be vended by LLVM somewhere.
static const char * const LinkerOptionsFlagName = "Linker Options";
// Remove duplicates.
llvm::SmallPtrSet<llvm::Metadata*, 4> knownAutolinkEntries;
AutolinkEntries.erase(std::remove_if(AutolinkEntries.begin(),
@@ -525,9 +522,46 @@ void IRGenModule::emitAutolinkInfo() {
}),
AutolinkEntries.end());
llvm::LLVMContext &ctx = Module.getContext();
Module.addModuleFlag(llvm::Module::AppendUnique, LinkerOptionsFlagName,
llvm::MDNode::get(ctx, AutolinkEntries));
switch (TargetInfo.OutputObjectFormat) {
case llvm::Triple::MachO: {
// FIXME: This constant should be vended by LLVM somewhere.
static const char * const LinkerOptionsFlagName = "Linker Options";
llvm::LLVMContext &ctx = Module.getContext();
Module.addModuleFlag(llvm::Module::AppendUnique, LinkerOptionsFlagName,
llvm::MDNode::get(ctx, AutolinkEntries));
break;
}
case llvm::Triple::ELF: {
// Merge the entries into null-separated string.
llvm::SmallString<64> EntriesString;
for (auto &EntryNode : AutolinkEntries) {
const llvm::MDNode *MD = cast<llvm::MDNode>(EntryNode);
for (auto &Entry : MD->operands()) {
const llvm::MDString *MS = cast<llvm::MDString>(Entry);
EntriesString += MS->getString();
EntriesString += '\0';
}
}
auto EntriesConstant = llvm::ConstantDataArray::getString(
LLVMContext, EntriesString, /*AddNull=*/false);
auto var = new llvm::GlobalVariable(*getModule(),
EntriesConstant->getType(), true,
llvm::GlobalValue::PrivateLinkage,
EntriesConstant,
"_swift1_autolink_entries");
var->setSection(".swift1_autolink_entries");
var->setAlignment(getPointerAlignment().getValue());
addUsedGlobal(var);
break;
}
default:
llvm_unreachable("Don't know how to emit autolink entries for "
"the selected object format.");
}
if (!Opts.ForceLoadSymbolName.empty()) {
llvm::SmallString<64> buf;