[llvm-pdbutil] Support dumping CodeView from object files.

We have llvm-readobj for dumping CodeView from object files, and
llvm-pdbutil has always been more focused on PDB.  However,
llvm-pdbutil has a lot of useful options for summarizing debug
information in aggregate and presenting high level statistical
views.  Furthermore, it's arguably better as a testing tool since
we don't have to write tests to conform to a state-machine like
structure where you match multiple lines in succession, each
depending on a previous match.  llvm-pdbutil dumps much more
concisely, so it's possible to use single-line matches in many
cases where as with readobj tests you have to use multi-line
matches with an implicit state machine.

Because of this, I'm adding object file support to llvm-pdbutil.
In fact, this mirrors the cvdump tool from Microsoft, which also
supports both object files and pdb files.  In the future we could
perhaps rename this tool llvm-cvutil.

In the meantime, this allows us to deep dive into object files
the same way we already can with PDB files.

llvm-svn: 312358

1 files changed, 25 insertions, 3 deletions

diff --git a/llvm/lib/DebugInfo/CodeView/StringsAndChecksums.cpp b/llvm/lib/DebugInfo/CodeView/StringsAndChecksums.cpp
index 306af1d1ef6..85d9dbb8c7d 100644
--- a/llvm/lib/DebugInfo/CodeView/StringsAndChecksums.cpp
+++ b/llvm/lib/DebugInfo/CodeView/StringsAndChecksums.cpp
@@ -35,14 +35,36 @@ void StringsAndChecksumsRef::initializeStrings(
   assert(SR.kind() == DebugSubsectionKind::StringTable);
   assert(!Strings && "Found a string table even though we already have one!");
 
-  OwnedStrings = llvm::make_unique<DebugStringTableSubsectionRef>();
+  OwnedStrings = std::make_shared<DebugStringTableSubsectionRef>();
   consumeError(OwnedStrings->initialize(SR.getRecordData()));
   Strings = OwnedStrings.get();
 }
 
+void StringsAndChecksumsRef::reset() {
+  resetStrings();
+  resetChecksums();
+}
+
+void StringsAndChecksumsRef::resetStrings() {
+  OwnedStrings.reset();
+  Strings = nullptr;
+}
+
+void StringsAndChecksumsRef::resetChecksums() {
+  OwnedChecksums.reset();
+  Checksums = nullptr;
+}
+
+void StringsAndChecksumsRef::setStrings(
+    const DebugStringTableSubsectionRef &StringsRef) {
+  OwnedStrings = std::make_shared<DebugStringTableSubsectionRef>();
+  *OwnedStrings = StringsRef;
+  Strings = OwnedStrings.get();
+}
+
 void StringsAndChecksumsRef::setChecksums(
     const DebugChecksumsSubsectionRef &CS) {
-  OwnedChecksums = llvm::make_unique<DebugChecksumsSubsectionRef>();
+  OwnedChecksums = std::make_shared<DebugChecksumsSubsectionRef>();
   *OwnedChecksums = CS;
   Checksums = OwnedChecksums.get();
 }
@@ -53,7 +75,7 @@ void StringsAndChecksumsRef::initializeChecksums(
   if (Checksums)
     return;
 
-  OwnedChecksums = llvm::make_unique<DebugChecksumsSubsectionRef>();
+  OwnedChecksums = std::make_shared<DebugChecksumsSubsectionRef>();
   consumeError(OwnedChecksums->initialize(FCR.getRecordData()));
   Checksums = OwnedChecksums.get();
 }