[llvm] [DWARFYAML] Implement debug_names support (PR #79666)

[James Henderson via llvm-commits]

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@@ -691,6 +691,191 @@ Error DWARFYAML::emitDebugStrOffsets(raw_ostream &OS, const Data &DI) {
   return Error::success();
 }
 
+namespace {
+/// Emits the header for a DebugNames section.
+void emitDebugNamesHeader(raw_ostream &OS, bool IsLittleEndian,
+                          uint32_t NameCount, uint32_t AbbrevSize,
+                          uint32_t CombinedSizeOtherParts) {
+  StringRef AugmentationString = "LLVM0700";
+  auto TotalSize = CombinedSizeOtherParts + 5 * sizeof(uint32_t) +
+                   2 * sizeof(uint16_t) + sizeof(NameCount) +
+                   sizeof(AbbrevSize) + AugmentationString.size();
+  writeInteger(uint32_t(TotalSize), OS, IsLittleEndian); // Unit length
+
+  // Everything below is included in total size.
+  writeInteger(uint16_t(5), OS, IsLittleEndian); // Version
+  writeInteger(uint16_t(0), OS, IsLittleEndian); // Padding
+  writeInteger(uint32_t(1), OS, IsLittleEndian); // Compilation Unit count
+  writeInteger(uint32_t(0), OS, IsLittleEndian); // Local Type Unit count
+  writeInteger(uint32_t(0), OS, IsLittleEndian); // Foreign Type Unit count
+  writeInteger(uint32_t(0), OS, IsLittleEndian); // Bucket count
+  writeInteger(NameCount, OS, IsLittleEndian);
+  writeInteger(AbbrevSize, OS, IsLittleEndian);
+  writeInteger(uint32_t(AugmentationString.size()), OS, IsLittleEndian);
+  OS.write(AugmentationString.data(), AugmentationString.size());
+  return;
+}
+
+/// Emits the abbreviations for a DebugNames section.
+std::string
+emitDebugNamesAbbrev(ArrayRef<DWARFYAML::DebugNameAbbreviation> Abbrevs) {
+  std::string Data;
+  llvm::raw_string_ostream OS(Data);
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jh7370 wrote:

Nit: here and in several other places - unnecessary `llvm::` qualifier (we're `using namespace llvm` at the start of the file).

https://github.com/llvm/llvm-project/pull/79666