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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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9
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -3658,6 +3658,8 @@ std::error_code BitcodeReader::parseModule(uint64_t ResumeBit,
}
// ALIAS: [alias type, addrspace, aliasee val#, linkage]
// ALIAS: [alias type, addrspace, aliasee val#, linkage, visibility, dllstorageclass]
// IFUNC: [alias type, addrspace, aliasee val#, linkage, visibility, dllstorageclass]
case bitc::MODULE_CODE_IFUNC:
case bitc::MODULE_CODE_ALIAS:
case bitc::MODULE_CODE_ALIAS_OLD: {
bool NewRecord = BitCode != bitc::MODULE_CODE_ALIAS_OLD;
@@ -3684,10 +3686,11 @@ std::error_code BitcodeReader::parseModule(uint64_t ResumeBit,
GlobalIndirectSymbol *NewGA;
if (BitCode == bitc::MODULE_CODE_ALIAS ||
BitCode == bitc::MODULE_CODE_ALIAS_OLD)
NewGA = GlobalAlias::create(
Ty, AddrSpace, getDecodedLinkage(Linkage), "", TheModule);
NewGA = GlobalAlias::create(Ty, AddrSpace, getDecodedLinkage(Linkage),
"", TheModule);
else
llvm_unreachable("Not an alias!");
NewGA = GlobalIFunc::create(Ty, AddrSpace, getDecodedLinkage(Linkage),
"", nullptr, TheModule);
// Old bitcode files didn't have visibility field.
// Local linkage must have default visibility.
if (OpNum != Record.size()) {