Stubs out TLOF for AIX and add support for common vars in assembly output.

Stubs out a TargetLoweringObjectFileXCOFF class, implementing only
SelectSectionForGlobal for common symbols. Also adds an override of
EmitGlobalVariable in PPCAIXAsmPrinter which adds a number of defensive errors
and adds support for emitting common globals.

llvm-svn: 366727

1 files changed, 55 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 23cb1c1d305..ba2c78c3b93 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -43,6 +43,7 @@
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCSectionWasm.h"
+#include "llvm/MC/MCSectionXCOFF.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/MCSymbolELF.h"
@@ -1819,3 +1820,57 @@ MCSection *TargetLoweringObjectFileWasm::getStaticDtorSection(
   llvm_unreachable("@llvm.global_dtors should have been lowered already");
   return nullptr;
 }
+
+//===----------------------------------------------------------------------===//
+//                                  XCOFF
+//===----------------------------------------------------------------------===//
+MCSection *TargetLoweringObjectFileXCOFF::getExplicitSectionGlobal(
+    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
+  llvm_unreachable("XCOFF explicit sections not yet implemented.");
+}
+
+MCSection *TargetLoweringObjectFileXCOFF::SelectSectionForGlobal(
+    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
+  assert(!TM.getFunctionSections() && !TM.getDataSections() &&
+         "XCOFF unique sections not yet implemented.");
+
+  // Common symbols go into a csect with matching name which will get mapped
+  // into the .bss section.
+  if (Kind.isCommon()) {
+    SmallString<128> Name;
+    getNameWithPrefix(Name, GO, TM);
+    return getContext().getXCOFFSection(Name, XCOFF::XMC_RW, XCOFF::XTY_CM,
+                                        Kind, /* BeginSymbolName */ nullptr);
+  }
+
+  report_fatal_error("XCOFF other section types not yet implemented.");
+}
+
+bool TargetLoweringObjectFileXCOFF::shouldPutJumpTableInFunctionSection(
+    bool UsesLabelDifference, const Function &F) const {
+  llvm_unreachable("TLOF XCOFF not yet implemented.");
+}
+
+void TargetLoweringObjectFileXCOFF::Initialize(MCContext &Ctx,
+                                               const TargetMachine &TgtM) {
+  TargetLoweringObjectFile::Initialize(Ctx, TgtM);
+  TTypeEncoding = 0;
+  PersonalityEncoding = 0;
+  LSDAEncoding = 0;
+}
+
+MCSection *TargetLoweringObjectFileXCOFF::getStaticCtorSection(
+    unsigned Priority, const MCSymbol *KeySym) const {
+  llvm_unreachable("XCOFF ctor section not yet implemented.");
+}
+
+MCSection *TargetLoweringObjectFileXCOFF::getStaticDtorSection(
+    unsigned Priority, const MCSymbol *KeySym) const {
+  llvm_unreachable("XCOFF dtor section not yet implemented.");
+}
+
+const MCExpr *TargetLoweringObjectFileXCOFF::lowerRelativeReference(
+    const GlobalValue *LHS, const GlobalValue *RHS,
+    const TargetMachine &TM) const {
+  llvm_unreachable("XCOFF not yet implemented.");
+}