Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 106 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/DebugInfo/CodeView/StringsAndChecksums.h b/clang-r353983/include/llvm/DebugInfo/CodeView/StringsAndChecksums.h
new file mode 100644
index 00000000..22a283e7
--- /dev/null
+++ b/clang-r353983/include/llvm/DebugInfo/CodeView/StringsAndChecksums.h
@@ -0,0 +1,106 @@
+//===- StringsAndChecksums.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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
+#define LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
+
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
+#include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h"
+#include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
+#include <memory>
+
+namespace llvm {
+namespace codeview {
+
+class StringsAndChecksumsRef {
+public:
+  // If no subsections are known about initially, we find as much as we can.
+  StringsAndChecksumsRef();
+
+  // If only a string table subsection is given, we find a checksums subsection.
+  explicit StringsAndChecksumsRef(const DebugStringTableSubsectionRef &Strings);
+
+  // If both subsections are given, we don't need to find anything.
+  StringsAndChecksumsRef(const DebugStringTableSubsectionRef &Strings,
+                         const DebugChecksumsSubsectionRef &Checksums);
+
+  void setStrings(const DebugStringTableSubsectionRef &Strings);
+  void setChecksums(const DebugChecksumsSubsectionRef &CS);
+
+  void reset();
+  void resetStrings();
+  void resetChecksums();
+
+  template <typename T> void initialize(T &&FragmentRange) {
+    for (const DebugSubsectionRecord &R : FragmentRange) {
+      if (Strings && Checksums)
+        return;
+      if (R.kind() == DebugSubsectionKind::FileChecksums) {
+        initializeChecksums(R);
+        continue;
+      }
+      if (R.kind() == DebugSubsectionKind::StringTable && !Strings) {
+        // While in practice we should never encounter a string table even
+        // though the string table is already initialized, in theory it's
+        // possible.  PDBs are supposed to have one global string table and
+        // then this subsection should not appear.  Whereas object files are
+        // supposed to have this subsection appear exactly once.  However,
+        // for testing purposes it's nice to be able to test this subsection
+        // independently of one format or the other, so for some tests we
+        // manually construct a PDB that contains this subsection in addition
+        // to a global string table.
+        initializeStrings(R);
+        continue;
+      }
+    }
+  }
+
+  const DebugStringTableSubsectionRef &strings() const { return *Strings; }
+  const DebugChecksumsSubsectionRef &checksums() const { return *Checksums; }
+
+  bool hasStrings() const { return Strings != nullptr; }
+  bool hasChecksums() const { return Checksums != nullptr; }
+
+private:
+  void initializeStrings(const DebugSubsectionRecord &SR);
+  void initializeChecksums(const DebugSubsectionRecord &FCR);
+
+  std::shared_ptr<DebugStringTableSubsectionRef> OwnedStrings;
+  std::shared_ptr<DebugChecksumsSubsectionRef> OwnedChecksums;
+
+  const DebugStringTableSubsectionRef *Strings = nullptr;
+  const DebugChecksumsSubsectionRef *Checksums = nullptr;
+};
+
+class StringsAndChecksums {
+public:
+  using StringsPtr = std::shared_ptr<DebugStringTableSubsection>;
+  using ChecksumsPtr = std::shared_ptr<DebugChecksumsSubsection>;
+
+  // If no subsections are known about initially, we find as much as we can.
+  StringsAndChecksums() = default;
+
+  void setStrings(const StringsPtr &SP) { Strings = SP; }
+  void setChecksums(const ChecksumsPtr &CP) { Checksums = CP; }
+
+  const StringsPtr &strings() const { return Strings; }
+  const ChecksumsPtr &checksums() const { return Checksums; }
+
+  bool hasStrings() const { return Strings != nullptr; }
+  bool hasChecksums() const { return Checksums != nullptr; }
+
+private:
+  StringsPtr Strings;
+  ChecksumsPtr Checksums;
+};
+
+} // end namespace codeview
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H