1 files changed, 93 insertions, 0 deletions
diff --git a/contrib/llvm/lib/DebugInfo/PDB/Native/GSI.cpp b/contrib/llvm/lib/DebugInfo/PDB/Native/GSI.cpp
new file mode 100644
index 0000000..b219fe2
--- /dev/null
+++ b/contrib/llvm/lib/DebugInfo/PDB/Native/GSI.cpp
@@ -0,0 +1,93 @@
+//===- GSI.cpp - Common Functions for GlobalsStream and PublicsStream  ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "GSI.h"
+
+#include "llvm/DebugInfo/PDB/Native/RawError.h"
+#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
+#include "llvm/Support/BinaryStreamArray.h"
+#include "llvm/Support/BinaryStreamReader.h"
+
+#include "llvm/Support/Error.h"
+
+namespace llvm {
+namespace pdb {
+
+static Error checkHashHdrVersion(const GSIHashHeader *HashHdr) {
+  if (HashHdr->VerHdr != GSIHashHeader::HdrVersion)
+    return make_error<RawError>(
+        raw_error_code::feature_unsupported,
+        "Encountered unsupported globals stream version.");
+
+  return Error::success();
+}
+
+Error readGSIHashBuckets(FixedStreamArray<support::ulittle32_t> &HashBuckets,
+                         const GSIHashHeader *HashHdr,
+                         BinaryStreamReader &Reader) {
+  if (auto EC = checkHashHdrVersion(HashHdr))
+    return EC;
+
+  // Before the actual hash buckets, there is a bitmap of length determined by
+  // IPHR_HASH.
+  ArrayRef<uint8_t> Bitmap;
+  size_t BitmapSizeInBits = alignTo(IPHR_HASH + 1, 32);
+  uint32_t NumBitmapEntries = BitmapSizeInBits / 8;
+  if (auto EC = Reader.readBytes(Bitmap, NumBitmapEntries))
+    return joinErrors(std::move(EC),
+                      make_error<RawError>(raw_error_code::corrupt_file,
+                                           "Could not read a bitmap."));
+  uint32_t NumBuckets = 0;
+  for (uint8_t B : Bitmap)
+    NumBuckets += countPopulation(B);
+
+  // Hash buckets follow.
+  if (auto EC = Reader.readArray(HashBuckets, NumBuckets))
+    return joinErrors(std::move(EC),
+                      make_error<RawError>(raw_error_code::corrupt_file,
+                                           "Hash buckets corrupted."));
+
+  return Error::success();
+}
+
+Error readGSIHashHeader(const GSIHashHeader *&HashHdr,
+                        BinaryStreamReader &Reader) {
+  if (Reader.readObject(HashHdr))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Stream does not contain a GSIHashHeader.");
+
+  if (HashHdr->VerSignature != GSIHashHeader::HdrSignature)
+    return make_error<RawError>(
+        raw_error_code::feature_unsupported,
+        "GSIHashHeader signature (0xffffffff) not found.");
+
+  return Error::success();
+}
+
+Error readGSIHashRecords(FixedStreamArray<PSHashRecord> &HashRecords,
+                         const GSIHashHeader *HashHdr,
+                         BinaryStreamReader &Reader) {
+  if (auto EC = checkHashHdrVersion(HashHdr))
+    return EC;
+
+  // HashHdr->HrSize specifies the number of bytes of PSHashRecords we have.
+  // Verify that we can read them all.
+  if (HashHdr->HrSize % sizeof(PSHashRecord))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Invalid HR array size.");
+  uint32_t NumHashRecords = HashHdr->HrSize / sizeof(PSHashRecord);
+  if (auto EC = Reader.readArray(HashRecords, NumHashRecords))
+    return joinErrors(std::move(EC),
+                      make_error<RawError>(raw_error_code::corrupt_file,
+                                           "Error reading hash records."));
+
+  return Error::success();
+}
+}
+}