1 files changed, 205 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h b/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
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index 000000000000..244678ce9dc1
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+++ b/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
@@ -0,0 +1,205 @@
+//===- llvm/CodeGen/DwarfFile.h - Dwarf Debug Framework ---------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFFILE_H
+#define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFFILE_H
+
+#include "DwarfStringPool.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/CodeGen/DIE.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/Support/Allocator.h"
+#include <map>
+#include <memory>
+#include <utility>
+
+namespace llvm {
+
+class AsmPrinter;
+class DbgEntity;
+class DbgVariable;
+class DbgLabel;
+class DwarfCompileUnit;
+class DwarfUnit;
+class LexicalScope;
+class MCSection;
+
+// Data structure to hold a range for range lists.
+class RangeSpan {
+public:
+  RangeSpan(MCSymbol *S, MCSymbol *E) : Start(S), End(E) {}
+  const MCSymbol *getStart() const { return Start; }
+  const MCSymbol *getEnd() const { return End; }
+  void setEnd(const MCSymbol *E) { End = E; }
+
+private:
+  const MCSymbol *Start, *End;
+};
+
+class RangeSpanList {
+private:
+  // Index for locating within the debug_range section this particular span.
+  MCSymbol *RangeSym;
+  const DwarfCompileUnit *CU;
+  // List of ranges.
+  SmallVector<RangeSpan, 2> Ranges;
+
+public:
+  RangeSpanList(MCSymbol *Sym, const DwarfCompileUnit &CU,
+                SmallVector<RangeSpan, 2> Ranges)
+      : RangeSym(Sym), CU(&CU), Ranges(std::move(Ranges)) {}
+  MCSymbol *getSym() const { return RangeSym; }
+  const DwarfCompileUnit &getCU() const { return *CU; }
+  const SmallVectorImpl<RangeSpan> &getRanges() const { return Ranges; }
+};
+
+class DwarfFile {
+  // Target of Dwarf emission, used for sizing of abbreviations.
+  AsmPrinter *Asm;
+
+  BumpPtrAllocator AbbrevAllocator;
+
+  // Used to uniquely define abbreviations.
+  DIEAbbrevSet Abbrevs;
+
+  // A pointer to all units in the section.
+  SmallVector<std::unique_ptr<DwarfCompileUnit>, 1> CUs;
+
+  DwarfStringPool StrPool;
+
+  // List of range lists for a given compile unit, separate from the ranges for
+  // the CU itself.
+  SmallVector<RangeSpanList, 1> CURangeLists;
+
+  /// DWARF v5: The symbol that designates the start of the contribution to
+  /// the string offsets table. The contribution is shared by all units.
+  MCSymbol *StringOffsetsStartSym = nullptr;
+
+  /// DWARF v5: The symbol that designates the base of the range list table.
+  /// The table is shared by all units.
+  MCSymbol *RnglistsTableBaseSym = nullptr;
+
+  /// DWARF v5: The symbol that designates the base of the locations list table.
+  /// The table is shared by all units.
+  MCSymbol *LoclistsTableBaseSym = nullptr;
+
+  /// The variables of a lexical scope.
+  struct ScopeVars {
+    /// We need to sort Args by ArgNo and check for duplicates. This could also
+    /// be implemented as a list or vector + std::lower_bound().
+    std::map<unsigned, DbgVariable *> Args;
+    SmallVector<DbgVariable *, 8> Locals;
+  };
+  /// Collection of DbgVariables of each lexical scope.
+  DenseMap<LexicalScope *, ScopeVars> ScopeVariables;
+
+  /// Collection of DbgLabels of each lexical scope.
+  using LabelList = SmallVector<DbgLabel *, 4>;
+  DenseMap<LexicalScope *, LabelList> ScopeLabels;
+
+  // Collection of abstract subprogram DIEs.
+  DenseMap<const MDNode *, DIE *> AbstractSPDies;
+  DenseMap<const DINode *, std::unique_ptr<DbgEntity>> AbstractEntities;
+
+  /// Maps MDNodes for type system with the corresponding DIEs. These DIEs can
+  /// be shared across CUs, that is why we keep the map here instead
+  /// of in DwarfCompileUnit.
+  DenseMap<const MDNode *, DIE *> DITypeNodeToDieMap;
+
+public:
+  DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA);
+
+  const SmallVectorImpl<std::unique_ptr<DwarfCompileUnit>> &getUnits() {
+    return CUs;
+  }
+
+  std::pair<uint32_t, RangeSpanList *> addRange(const DwarfCompileUnit &CU,
+                                                SmallVector<RangeSpan, 2> R);
+
+  /// getRangeLists - Get the vector of range lists.
+  const SmallVectorImpl<RangeSpanList> &getRangeLists() const {
+    return CURangeLists;
+  }
+
+  /// Compute the size and offset of a DIE given an incoming Offset.
+  unsigned computeSizeAndOffset(DIE &Die, unsigned Offset);
+
+  /// Compute the size and offset of all the DIEs.
+  void computeSizeAndOffsets();
+
+  /// Compute the size and offset of all the DIEs in the given unit.
+  /// \returns The size of the root DIE.
+  unsigned computeSizeAndOffsetsForUnit(DwarfUnit *TheU);
+
+  /// Add a unit to the list of CUs.
+  void addUnit(std::unique_ptr<DwarfCompileUnit> U);
+
+  /// Emit all of the units to the section listed with the given
+  /// abbreviation section.
+  void emitUnits(bool UseOffsets);
+
+  /// Emit the given unit to its section.
+  void emitUnit(DwarfUnit *TheU, bool UseOffsets);
+
+  /// Emit a set of abbreviations to the specific section.
+  void emitAbbrevs(MCSection *);
+
+  /// Emit all of the strings to the section given. If OffsetSection is
+  /// non-null, emit a table of string offsets to it. If UseRelativeOffsets
+  /// is false, emit absolute offsets to the strings. Otherwise, emit
+  /// relocatable references to the strings if they are supported by the target.
+  void emitStrings(MCSection *StrSection, MCSection *OffsetSection = nullptr,
+                   bool UseRelativeOffsets = false);
+
+  /// Returns the string pool.
+  DwarfStringPool &getStringPool() { return StrPool; }
+
+  MCSymbol *getStringOffsetsStartSym() const { return StringOffsetsStartSym; }
+  void setStringOffsetsStartSym(MCSymbol *Sym) { StringOffsetsStartSym = Sym; }
+
+  MCSymbol *getRnglistsTableBaseSym() const { return RnglistsTableBaseSym; }
+  void setRnglistsTableBaseSym(MCSymbol *Sym) { RnglistsTableBaseSym = Sym; }
+
+  MCSymbol *getLoclistsTableBaseSym() const { return LoclistsTableBaseSym; }
+  void setLoclistsTableBaseSym(MCSymbol *Sym) { LoclistsTableBaseSym = Sym; }
+
+  /// \returns false if the variable was merged with a previous one.
+  bool addScopeVariable(LexicalScope *LS, DbgVariable *Var);
+
+  void addScopeLabel(LexicalScope *LS, DbgLabel *Label);
+
+  DenseMap<LexicalScope *, ScopeVars> &getScopeVariables() {
+    return ScopeVariables;
+  }
+
+  DenseMap<LexicalScope *, LabelList> &getScopeLabels() {
+    return ScopeLabels;
+  }
+
+  DenseMap<const MDNode *, DIE *> &getAbstractSPDies() {
+    return AbstractSPDies;
+  }
+
+  DenseMap<const DINode *, std::unique_ptr<DbgEntity>> &getAbstractEntities() {
+    return AbstractEntities;
+  }
+
+  void insertDIE(const MDNode *TypeMD, DIE *Die) {
+    DITypeNodeToDieMap.insert(std::make_pair(TypeMD, Die));
+  }
+
+  DIE *getDIE(const MDNode *TypeMD) {
+    return DITypeNodeToDieMap.lookup(TypeMD);
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_CODEGEN_ASMPRINTER_DWARFFILE_H