[llvm-branch-commits] [llvm] [llvm-debuginfo-analyzer] Add support for LLVM IR format. (PR #135440)

[Jeremy Morse via llvm-branch-commits]

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+//===-- LVIRReader.h --------------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the LVIRReader class, which is used to describe a
+// LLVM IR reader.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_LOGICALVIEW_READERS_LVIRREADER_H
+#define LLVM_DEBUGINFO_LOGICALVIEW_READERS_LVIRREADER_H
+
+#include "llvm/DebugInfo/LogicalView/Core/LVReader.h"
+#include "llvm/Transforms/Utils/DebugSSAUpdater.h"
+
+namespace llvm {
+class DIFile;
+class DINode;
+class DILocation;
+class DIScope;
+class DISubprogram;
+class DIVariable;
+class BasicBlock;
+
+namespace object {
+class IRObjectFile;
+}
+
+namespace logicalview {
+
+class LVElement;
+class LVLine;
+class LVScopeCompileUnit;
+class LVSymbol;
+class LVType;
+
+class LVIRReader final : public LVReader {
+  object::IRObjectFile *BitCodeIR = nullptr;
+  MemoryBufferRef *TextualIR = nullptr;
+
+  // Symbols with locations for current compile unit.
+  LVSymbols SymbolsWithLocations;
+
+  LVSectionIndex SectionIndex = 0;
+
+  const DICompileUnit *CUNode = nullptr;
+
+  // The Dwarf Version (from the module flags).
+  unsigned DwarfVersion;
+
+  // Location index for global variables.
+  uint64_t PoolAddressIndex = 0;
+
+  // Whether to emit all linkage names, or just abstract subprograms.
+  bool UseAllLinkageNames = true;
+
+  // Dependencies on external options (llc, etc).
+  bool includeMinimalInlineScopes() const;
+  bool useAllLinkageNames() const { return UseAllLinkageNames; }
+
+  bool LanguageIsFortran = false;
+  void mapFortranLanguage(unsigned DWLang);
+  bool moduleIsInFortran() const { return LanguageIsFortran; }
+
+  // Generate logical debug line before prologue.
+  bool GenerateLineBeforePrologue = true;
+
+  // We assume a constante increase between instructions.
+  const unsigned OffsetIncrease = 4;
+  void updateLineOffset() { CurrentOffset += OffsetIncrease; }
+
+  // An anonymous type for index type.
+  LVType *NodeIndexType = nullptr;
+
+  std::unique_ptr<DbgValueRangeTable> DbgValueRanges;
+
+  // Record the last assigned file index for each compile unit.
+  using LVIndexFiles = std::map<LVScopeCompileUnit *, size_t>;
+  LVIndexFiles IndexFiles;
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jmorse wrote:

It wasn't immediately obvious to me that this is a per-CU counter of the /next/ FileID to assign to a new file that gets discovered. I think it's worth recording in the comment here that this data-structure is to aid mapping DIFiles onto a DWARF-like file table, to explain what's going on.

https://github.com/llvm/llvm-project/pull/135440