Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/lib/MC/MCSection.cpp

@@ -0,0 +1,101 @@
+//===- lib/MC/MCSection.cpp - Machine 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/MCSection.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCFragment.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <utility>
+
+using namespace llvm;
+
+MCSection::MCSection(SectionVariant V, SectionKind K, MCSymbol *Begin)
+    : Begin(Begin), BundleGroupBeforeFirstInst(false), HasInstructions(false),
+      IsRegistered(false), DummyFragment(this), Variant(V), Kind(K) {}
+
+MCSymbol *MCSection::getEndSymbol(MCContext &Ctx) {
+  if (!End)
+    End = Ctx.createTempSymbol("sec_end", true);
+  return End;
+}
+
+bool MCSection::hasEnded() const { return End && End->isInSection(); }
+
+MCSection::~MCSection() = default;
+
+void MCSection::setBundleLockState(BundleLockStateType NewState) {
+  if (NewState == NotBundleLocked) {
+    if (BundleLockNestingDepth == 0) {
+      report_fatal_error("Mismatched bundle_lock/unlock directives");
+    }
+    if (--BundleLockNestingDepth == 0) {
+      BundleLockState = NotBundleLocked;
+    }
+    return;
+  }
+
+  // If any of the directives is an align_to_end directive, the whole nested
+  // group is align_to_end. So don't downgrade from align_to_end to just locked.
+  if (BundleLockState != BundleLockedAlignToEnd) {
+    BundleLockState = NewState;
+  }
+  ++BundleLockNestingDepth;
+}
+
+MCSection::iterator
+MCSection::getSubsectionInsertionPoint(unsigned Subsection) {
+  if (Subsection == 0 && SubsectionFragmentMap.empty())
+    return end();
+
+  SmallVectorImpl<std::pair<unsigned, MCFragment *>>::iterator MI =
+      std::lower_bound(SubsectionFragmentMap.begin(),
+                       SubsectionFragmentMap.end(),
+                       std::make_pair(Subsection, (MCFragment *)nullptr));
+  bool ExactMatch = false;
+  if (MI != SubsectionFragmentMap.end()) {
+    ExactMatch = MI->first == Subsection;
+    if (ExactMatch)
+      ++MI;
+  }
+  iterator IP;
+  if (MI == SubsectionFragmentMap.end())
+    IP = end();
+  else
+    IP = MI->second->getIterator();
+  if (!ExactMatch && Subsection != 0) {
+    // The GNU as documentation claims that subsections have an alignment of 4,
+    // although this appears not to be the case.
+    MCFragment *F = new MCDataFragment();
+    SubsectionFragmentMap.insert(MI, std::make_pair(Subsection, F));
+    getFragmentList().insert(IP, F);
+    F->setParent(this);
+  }
+
+  return IP;
+}
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+LLVM_DUMP_METHOD void MCSection::dump() const {
+  raw_ostream &OS = errs();
+
+  OS << "<MCSection";
+  OS << " Fragments:[\n      ";
+  for (auto it = begin(), ie = end(); it != ie; ++it) {
+    if (it != begin())
+      OS << ",\n      ";
+    it->dump();
+  }
+  OS << "]>";
+}
+#endif