Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/lib/Target/ARM/ARMTargetObjectFile.cpp

@@ -0,0 +1,91 @@
+//===-- llvm/Target/ARMTargetObjectFile.cpp - ARM Object Info Impl --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARMTargetObjectFile.h"
+#include "ARMSubtarget.h"
+#include "ARMTargetMachine.h"
+#include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCTargetOptions.h"
+#include "llvm/MC/SectionKind.h"
+#include "llvm/Target/TargetMachine.h"
+#include <cassert>
+
+using namespace llvm;
+using namespace dwarf;
+
+//===----------------------------------------------------------------------===//
+//                               ELF Target
+//===----------------------------------------------------------------------===//
+
+void ARMElfTargetObjectFile::Initialize(MCContext &Ctx,
+                                        const TargetMachine &TM) {
+  const ARMBaseTargetMachine &ARM_TM = static_cast<const ARMBaseTargetMachine &>(TM);
+  bool isAAPCS_ABI = ARM_TM.TargetABI == ARMBaseTargetMachine::ARMABI::ARM_ABI_AAPCS;
+  //  genExecuteOnly = ARM_TM.getSubtargetImpl()->genExecuteOnly();
+
+  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(isAAPCS_ABI);
+
+  if (isAAPCS_ABI) {
+    LSDASection = nullptr;
+  }
+
+  AttributesSection =
+      getContext().getELFSection(".ARM.attributes", ELF::SHT_ARM_ATTRIBUTES, 0);
+}
+
+const MCExpr *ARMElfTargetObjectFile::getTTypeGlobalReference(
+    const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
+    MachineModuleInfo *MMI, MCStreamer &Streamer) const {
+  if (TM.getMCAsmInfo()->getExceptionHandlingType() != ExceptionHandling::ARM)
+    return TargetLoweringObjectFileELF::getTTypeGlobalReference(
+        GV, Encoding, TM, MMI, Streamer);
+
+  assert(Encoding == DW_EH_PE_absptr && "Can handle absptr encoding only");
+
+  return MCSymbolRefExpr::create(TM.getSymbol(GV),
+                                 MCSymbolRefExpr::VK_ARM_TARGET2, getContext());
+}
+
+const MCExpr *ARMElfTargetObjectFile::
+getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
+  return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_ARM_TLSLDO,
+                                 getContext());
+}
+
+static bool isExecuteOnlyFunction(const GlobalObject *GO, SectionKind SK,
+                                  const TargetMachine &TM) {
+  if (const Function *F = dyn_cast<Function>(GO))
+    if (TM.getSubtarget<ARMSubtarget>(*F).genExecuteOnly() && SK.isText())
+      return true;
+  return false;
+}
+
+MCSection *ARMElfTargetObjectFile::getExplicitSectionGlobal(
+    const GlobalObject *GO, SectionKind SK, const TargetMachine &TM) const {
+  // Set execute-only access for the explicit section
+  if (isExecuteOnlyFunction(GO, SK, TM))
+    SK = SectionKind::getExecuteOnly();
+
+  return TargetLoweringObjectFileELF::getExplicitSectionGlobal(GO, SK, TM);
+}
+
+MCSection *ARMElfTargetObjectFile::SelectSectionForGlobal(
+    const GlobalObject *GO, SectionKind SK, const TargetMachine &TM) const {
+  // Place the global in the execute-only text section
+  if (isExecuteOnlyFunction(GO, SK, TM))
+    SK = SectionKind::getExecuteOnly();
+
+  return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, SK, TM);
+}