[GCC] Attribute ifunc support in llvm
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
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 0e74fe3..b8ebe8f 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -3658,6 +3658,8 @@
}
// 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 @@
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()) {