Put jump tables in unique sections on COFF.
If a function is going in an unique section (because of -ffunction-sections
for example), putting a jump table in .rodata will keep .rodata alive and
that will keep alive any other function that also has a jump table.
Instead, put the jump table in a unique section that is associated with the
function.
llvm-svn: 231961
diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index e8ef63a..725b824 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -948,6 +948,31 @@
return DataSection;
}
+const MCSection *TargetLoweringObjectFileCOFF::getSectionForJumpTable(
+ const Function &F, Mangler &Mang, const TargetMachine &TM) const {
+ // If the function can be removed, produce a unique section so that
+ // the table doesn't prevent the removal.
+ const Comdat *C = F.getComdat();
+ bool EmitUniqueSection = TM.getFunctionSections() || C;
+ if (!EmitUniqueSection)
+ return ReadOnlySection;
+
+ // FIXME: we should produce a symbol for F instead.
+ if (F.hasPrivateLinkage())
+ return ReadOnlySection;
+
+ MCSymbol *Sym = TM.getSymbol(&F, Mang);
+ StringRef COMDATSymName = Sym->getName();
+
+ SectionKind Kind = SectionKind::getReadOnly();
+ const char *Name = getCOFFSectionNameForUniqueGlobal(Kind);
+ unsigned Characteristics = getCOFFSectionFlags(Kind);
+ Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
+
+ return getContext().getCOFFSection(Name, Characteristics, Kind, COMDATSymName,
+ COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE);
+}
+
StringRef TargetLoweringObjectFileCOFF::
getDepLibFromLinkerOpt(StringRef LinkerOption) const {
const char *LibCmd = "/DEFAULTLIB:";