1 files changed, 131 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp b/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
new file mode 100644
index 000000000000..e3c9095d1343
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
@@ -0,0 +1,131 @@
+//===- llvm/CodeGen/DwarfFile.cpp - Dwarf Debug Framework -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfFile.h"
+#include "DwarfCompileUnit.h"
+#include "DwarfDebug.h"
+#include "DwarfUnit.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/DIE.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include "llvm/MC/MCStreamer.h"
+#include <algorithm>
+#include <cstdint>
+
+using namespace llvm;
+
+DwarfFile::DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA)
+    : Asm(AP), Abbrevs(AbbrevAllocator), StrPool(DA, *Asm, Pref) {}
+
+void DwarfFile::addUnit(std::unique_ptr<DwarfCompileUnit> U) {
+  CUs.push_back(std::move(U));
+}
+
+// Emit the various dwarf units to the unit section USection with
+// the abbreviations going into ASection.
+void DwarfFile::emitUnits(bool UseOffsets) {
+  for (const auto &TheU : CUs)
+    emitUnit(TheU.get(), UseOffsets);
+}
+
+void DwarfFile::emitUnit(DwarfUnit *TheU, bool UseOffsets) {
+  if (TheU->getCUNode()->isDebugDirectivesOnly())
+    return;
+
+  MCSection *S = TheU->getSection();
+
+  if (!S)
+    return;
+
+  // Skip CUs that ended up not being needed (split CUs that were abandoned
+  // because they added no information beyond the non-split CU)
+  if (llvm::empty(TheU->getUnitDie().values()))
+    return;
+
+  Asm->OutStreamer->SwitchSection(S);
+  TheU->emitHeader(UseOffsets);
+  Asm->emitDwarfDIE(TheU->getUnitDie());
+
+  if (MCSymbol *EndLabel = TheU->getEndLabel())
+    Asm->OutStreamer->EmitLabel(EndLabel);
+}
+
+// Compute the size and offset for each DIE.
+void DwarfFile::computeSizeAndOffsets() {
+  // Offset from the first CU in the debug info section is 0 initially.
+  unsigned SecOffset = 0;
+
+  // Iterate over each compile unit and set the size and offsets for each
+  // DIE within each compile unit. All offsets are CU relative.
+  for (const auto &TheU : CUs) {
+    if (TheU->getCUNode()->isDebugDirectivesOnly())
+      continue;
+
+    // Skip CUs that ended up not being needed (split CUs that were abandoned
+    // because they added no information beyond the non-split CU)
+    if (llvm::empty(TheU->getUnitDie().values()))
+      return;
+
+    TheU->setDebugSectionOffset(SecOffset);
+    SecOffset += computeSizeAndOffsetsForUnit(TheU.get());
+  }
+}
+
+unsigned DwarfFile::computeSizeAndOffsetsForUnit(DwarfUnit *TheU) {
+  // CU-relative offset is reset to 0 here.
+  unsigned Offset = sizeof(int32_t) +      // Length of Unit Info
+                    TheU->getHeaderSize(); // Unit-specific headers
+
+  // The return value here is CU-relative, after laying out
+  // all of the CU DIE.
+  return computeSizeAndOffset(TheU->getUnitDie(), Offset);
+}
+
+// Compute the size and offset of a DIE. The offset is relative to start of the
+// CU. It returns the offset after laying out the DIE.
+unsigned DwarfFile::computeSizeAndOffset(DIE &Die, unsigned Offset) {
+  return Die.computeOffsetsAndAbbrevs(Asm, Abbrevs, Offset);
+}
+
+void DwarfFile::emitAbbrevs(MCSection *Section) { Abbrevs.Emit(Asm, Section); }
+
+// Emit strings into a string section.
+void DwarfFile::emitStrings(MCSection *StrSection, MCSection *OffsetSection,
+                            bool UseRelativeOffsets) {
+  StrPool.emit(*Asm, StrSection, OffsetSection, UseRelativeOffsets);
+}
+
+bool DwarfFile::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
+  auto &ScopeVars = ScopeVariables[LS];
+  const DILocalVariable *DV = Var->getVariable();
+  if (unsigned ArgNum = DV->getArg()) {
+    auto Cached = ScopeVars.Args.find(ArgNum);
+    if (Cached == ScopeVars.Args.end())
+      ScopeVars.Args[ArgNum] = Var;
+    else {
+      Cached->second->addMMIEntry(*Var);
+      return false;
+    }
+  } else {
+    ScopeVars.Locals.push_back(Var);
+  }
+  return true;
+}
+
+void DwarfFile::addScopeLabel(LexicalScope *LS, DbgLabel *Label) {
+  SmallVectorImpl<DbgLabel *> &Labels = ScopeLabels[LS];
+  Labels.push_back(Label);
+}
+
+std::pair<uint32_t, RangeSpanList *>
+DwarfFile::addRange(const DwarfCompileUnit &CU, SmallVector<RangeSpan, 2> R) {
+  CURangeLists.push_back(
+      RangeSpanList(Asm->createTempSymbol("debug_ranges"), CU, std::move(R)));
+  return std::make_pair(CURangeLists.size() - 1, &CURangeLists.back());
+}