Revert "On ELF, put PIC jump tables in a non executable section."

This reverts commit r228939.

The commit broke something in the output of exception handling tables on
darwin x86-64.

llvm-svn: 229203

3 files changed, 13 insertions, 29 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 5a01e0e9b6f..aacc486aa14 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1178,14 +1178,23 @@ void AsmPrinter::EmitJumpTableInfo() {
   // the appropriate section.
   const Function *F = MF->getFunction();
   const TargetLoweringObjectFile &TLOF = getObjFileLowering();
-  bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
-      MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32,
-      *F);
-  if (JTInDiffSection) {
+  bool JTInDiffSection = false;
+  if (// In PIC mode, we need to emit the jump table to the same section as the
+      // function body itself, otherwise the label differences won't make sense.
+      // FIXME: Need a better predicate for this: what about custom entries?
+      MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
+      // We should also do if the section name is NULL or function is declared
+      // in discardable section
+      // FIXME: this isn't the right predicate, should be based on the MCSection
+      // for the function.
+      F->isWeakForLinker()) {
+    OutStreamer.SwitchSection(TLOF.SectionForGlobal(F, *Mang, TM));
+  } else {
     // Otherwise, drop it in the readonly section.
     const MCSection *ReadOnlySection =
         TLOF.getSectionForJumpTable(*F, *Mang, TM);
     OutStreamer.SwitchSection(ReadOnlySection);
+    JTInDiffSection = true;
   }
 
   EmitAlignment(Log2_32(
diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 4f46e37d39c..0a49f5ff9fe 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -356,13 +356,6 @@ const MCSection *TargetLoweringObjectFileELF::getSectionForJumpTable(
   return getContext().getELFSection(Name, ELF::SHT_PROGBITS, Flags, 0, Group);
 }
 
-bool TargetLoweringObjectFileELF::shouldPutJumpTableInFunctionSection(
-    bool UsesLabelDifference, const Function &F) const {
-  // We can always create relative relocations, so use another section
-  // that can be marked non-executable.
-  return false;
-}
-
 /// getSectionForConstant - Given a mergeable constant with the
 /// specified size and relocation information, return a section that it
 /// should be placed in.
diff --git a/llvm/lib/Target/TargetLoweringObjectFile.cpp b/llvm/lib/Target/TargetLoweringObjectFile.cpp
index faa6fbe6075..c098035a5aa 100644
--- a/llvm/lib/Target/TargetLoweringObjectFile.cpp
+++ b/llvm/lib/Target/TargetLoweringObjectFile.cpp
@@ -275,24 +275,6 @@ const MCSection *TargetLoweringObjectFile::getSectionForJumpTable(
   return getSectionForConstant(SectionKind::getReadOnly(), /*C=*/nullptr);
 }
 
-bool TargetLoweringObjectFile::shouldPutJumpTableInFunctionSection(
-    bool UsesLabelDifference, const Function &F) const {
-  // In PIC mode, we need to emit the jump table to the same section as the
-  // function body itself, otherwise the label differences won't make sense.
-  // FIXME: Need a better predicate for this: what about custom entries?
-  if (UsesLabelDifference)
-    return true;
-
-  // We should also do if the section name is NULL or function is declared
-  // in discardable section
-  // FIXME: this isn't the right predicate, should be based on the MCSection
-  // for the function.
-  if (F.isWeakForLinker())
-    return true;
-
-  return false;
-}
-
 /// getSectionForConstant - Given a mergable constant with the
 /// specified size and relocation information, return a section that it
 /// should be placed in.