Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/lib/MC/MCSectionCOFF.cpp

@@ -0,0 +1,111 @@
+//===- lib/MC/MCSectionCOFF.cpp - COFF Code Section Representation --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/BinaryFormat/COFF.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cassert>
+
+using namespace llvm;
+
+MCSectionCOFF::~MCSectionCOFF() = default; // anchor.
+
+// ShouldOmitSectionDirective - Decides whether a '.section' directive
+// should be printed before the section name
+bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name,
+                                               const MCAsmInfo &MAI) const {
+  if (COMDATSymbol)
+    return false;
+
+  // FIXME: Does .section .bss/.data/.text work everywhere??
+  if (Name == ".text" || Name == ".data" || Name == ".bss")
+    return true;
+
+  return false;
+}
+
+void MCSectionCOFF::setSelection(int Selection) const {
+  assert(Selection != 0 && "invalid COMDAT selection type");
+  this->Selection = Selection;
+  Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
+}
+
+void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
+                                         raw_ostream &OS,
+                                         const MCExpr *Subsection) const {
+  // standard sections don't require the '.section'
+  if (ShouldOmitSectionDirective(SectionName, MAI)) {
+    OS << '\t' << getSectionName() << '\n';
+    return;
+  }
+
+  OS << "\t.section\t" << getSectionName() << ",\"";
+  if (getCharacteristics() & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
+    OS << 'd';
+  if (getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
+    OS << 'b';
+  if (getCharacteristics() & COFF::IMAGE_SCN_MEM_EXECUTE)
+    OS << 'x';
+  if (getCharacteristics() & COFF::IMAGE_SCN_MEM_WRITE)
+    OS << 'w';
+  else if (getCharacteristics() & COFF::IMAGE_SCN_MEM_READ)
+    OS << 'r';
+  else
+    OS << 'y';
+  if (getCharacteristics() & COFF::IMAGE_SCN_LNK_REMOVE)
+    OS << 'n';
+  if (getCharacteristics() & COFF::IMAGE_SCN_MEM_SHARED)
+    OS << 's';
+  if ((getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE) &&
+      !isImplicitlyDiscardable(SectionName))
+    OS << 'D';
+  OS << '"';
+
+  if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
+    OS << ",";
+    switch (Selection) {
+      case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES:
+        OS << "one_only,";
+        break;
+      case COFF::IMAGE_COMDAT_SELECT_ANY:
+        OS << "discard,";
+        break;
+      case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE:
+        OS << "same_size,";
+        break;
+      case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH:
+        OS << "same_contents,";
+        break;
+      case COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE:
+        OS << "associative,";
+        break;
+      case COFF::IMAGE_COMDAT_SELECT_LARGEST:
+        OS << "largest,";
+        break;
+      case COFF::IMAGE_COMDAT_SELECT_NEWEST:
+        OS << "newest,";
+        break;
+      default:
+        assert(false && "unsupported COFF selection type");
+        break;
+    }
+    assert(COMDATSymbol);
+    COMDATSymbol->print(OS, &MAI);
+  }
+  OS << '\n';
+}
+
+bool MCSectionCOFF::UseCodeAlign() const {
+  return getKind().isText();
+}
+
+bool MCSectionCOFF::isVirtualSection() const {
+  return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
+}