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[GCC] Attribute ifunc support in llvm

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This patch add support for GCC attribute((ifunc("resolver"))) for
targets that use ELF as object file format. In general ifunc is a
special kind of function alias with type @gnu_indirect_function. Patch
for Clang http://reviews.llvm.org/D15524

Differential Revision: http://reviews.llvm.org/D15525

llvm-svn: 265667
This commit is contained in:
Dmitry Polukhin
2016-04-07 12:32:19 +00:00
parent 79cb643b20
commit a1feff7024
24 changed files with 369 additions and 22 deletions
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12
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -809,6 +809,18 @@ static uint64_t WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
Vals.clear();
}
// Emit the ifunc information.
for (const GlobalIFunc &I : M->ifuncs()) {
// IFUNC: [ifunc type, address space, resolver val#, linkage, visibility]
Vals.push_back(VE.getTypeID(I.getValueType()));
Vals.push_back(I.getType()->getAddressSpace());
Vals.push_back(VE.getValueID(I.getResolver()));
Vals.push_back(getEncodedLinkage(I));
Vals.push_back(getEncodedVisibility(I));
Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
Vals.clear();
}
// Emit the module's source file name.
{
StringEncoding Bits = getStringEncoding(M->getSourceFileName().data(),