[pdb] Round trip the NameMap data structure to YAML.

llvm-svn: 275628

1 files changed, 40 insertions, 4 deletions

diff --git a/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp b/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
index 3638380eb22..b8a4eb79a48 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
@@ -146,20 +146,56 @@ Error NameMap::load(codeview::StreamReader &Stream) {
 }
 
 Error NameMap::commit(codeview::StreamWriter &Writer) {
-  if (auto EC = Writer.writeInteger(0U)) // Number of bytes in table
+  // The first field is the number of bytes of string data.  So add
+  // up the length of all strings plus a null terminator for each
+  // one.
+  uint32_t NumBytes = 0;
+  for (auto B = Mapping.begin(), E = Mapping.end(); B != E; ++B) {
+    NumBytes += B->getKeyLength() + 1;
+  }
+
+  if (auto EC = Writer.writeInteger(NumBytes)) // Number of bytes of string data
     return EC;
+  // Now all of the string data itself.
+  for (auto B = Mapping.begin(), E = Mapping.end(); B != E; ++B) {
+    if (auto EC = Writer.writeZeroString(B->getKey()))
+      return EC;
+  }
 
-  if (auto EC = Writer.writeInteger(0U)) // Hash Size
+  if (auto EC = Writer.writeInteger(Mapping.size())) // Hash Size
     return EC;
 
-  if (auto EC = Writer.writeInteger(0U)) // Max Number of Strings
+  if (auto EC = Writer.writeInteger(Mapping.size())) // Max Number of Strings
     return EC;
 
-  if (auto EC = Writer.writeInteger(0U)) // Num Present Words
+  if (auto EC = Writer.writeInteger(Mapping.size())) // Num Present Words
     return EC;
 
+  // For each entry in the mapping, write a bit mask which represents a bucket
+  // to store it in.  We don't use this, so the value we write isn't important
+  // to us, it just has to be there.
+  for (auto B = Mapping.begin(), E = Mapping.end(); B != E; ++B) {
+    if (auto EC = Writer.writeInteger(1U))
+      return EC;
+  }
+
   if (auto EC = Writer.writeInteger(0U)) // Num Deleted Words
     return EC;
+
+  // Mappings of each word.
+  uint32_t OffsetSoFar = 0;
+  for (auto B = Mapping.begin(), E = Mapping.end(); B != E; ++B) {
+    // This is a list of key value pairs where the key is the offset into the
+    // strings buffer, and the value is a stream number.  Write each pair.
+    if (auto EC = Writer.writeInteger(OffsetSoFar))
+      return EC;
+
+    if (auto EC = Writer.writeInteger(B->second))
+      return EC;
+
+    OffsetSoFar += B->getKeyLength() + 1;
+  }
+
   return Error::success();
 }