[CodeView] Isolate Debug Info Fragments into standalone classes.

Previously parsing of these were all grouped together into a
single master class that could parse any type of debug info
fragment.

With writing forthcoming, the complexity of each individual
fragment is enough to warrant them having their own classes so
that reading and writing of each fragment type can be grouped
together, but isolated from the code for reading and writing
other fragment types.

In doing so, I found a place where parsing code was duplicated
for the FileChecksums fragment, across llvm-readobj and the
CodeView library, and one of the implementations had a bug.
Now that the codepaths are merged, the bug is resolved.

Differential Revision: https://reviews.llvm.org/D32547

llvm-svn: 301557

1 files changed, 47 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/CodeView/ModuleDebugFragmentRecord.cpp b/llvm/lib/DebugInfo/CodeView/ModuleDebugFragmentRecord.cpp
new file mode 100644
index 00000000000..20c06e9bebe
--- /dev/null
+++ b/llvm/lib/DebugInfo/CodeView/ModuleDebugFragmentRecord.cpp
@@ -0,0 +1,47 @@
+//===- ModuleDebugFragmentRecord.cpp -----------------------------*- C++-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/CodeView/ModuleDebugFragmentRecord.h"
+
+#include "llvm/Support/BinaryStreamReader.h"
+
+using namespace llvm;
+using namespace llvm::codeview;
+
+ModuleDebugFragmentRecord::ModuleDebugFragmentRecord()
+    : Kind(ModuleDebugFragmentKind::None) {}
+
+ModuleDebugFragmentRecord::ModuleDebugFragmentRecord(
+    ModuleDebugFragmentKind Kind, BinaryStreamRef Data)
+    : Kind(Kind), Data(Data) {}
+
+Error ModuleDebugFragmentRecord::initialize(BinaryStreamRef Stream,
+                                            ModuleDebugFragmentRecord &Info) {
+  const ModuleDebugFragmentHeader *Header;
+  BinaryStreamReader Reader(Stream);
+  if (auto EC = Reader.readObject(Header))
+    return EC;
+
+  ModuleDebugFragmentKind Kind =
+      static_cast<ModuleDebugFragmentKind>(uint32_t(Header->Kind));
+  if (auto EC = Reader.readStreamRef(Info.Data, Header->Length))
+    return EC;
+  Info.Kind = Kind;
+  return Error::success();
+}
+
+uint32_t ModuleDebugFragmentRecord::getRecordLength() const {
+  return sizeof(ModuleDebugFragmentHeader) + Data.getLength();
+}
+
+ModuleDebugFragmentKind ModuleDebugFragmentRecord::kind() const { return Kind; }
+
+BinaryStreamRef ModuleDebugFragmentRecord::getRecordData() const {
+  return Data;
+}