Add support for writing through StreamInterface.

This adds method and tests for writing to a PDB stream.  With
this, even a PDB stream which is discontiguous can be treated
as a sequential stream of bytes for the purposes of writing.

Reviewed By: ruiu
Differential Revision: http://reviews.llvm.org/D21157

llvm-svn: 272369

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp b/llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp
index 086105b..7426dae 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp
@@ -136,6 +136,17 @@ ArrayRef<uint8_t> PDBFile::getBlockData(uint32_t BlockIndex,
       NumBytes);
 }
 
+Error PDBFile::setBlockData(uint32_t BlockIndex, uint32_t Offset,
+                            ArrayRef<uint8_t> Data) const {
+  if (BlockIndex >= getBlockCount())
+    return make_error<RawError>(raw_error_code::invalid_block_address);
+
+  if (Offset > getBlockSize() - Data.size())
+    return make_error<RawError>(raw_error_code::insufficient_buffer);
+
+  return make_error<RawError>(raw_error_code::not_writable);
+}
+
 Error PDBFile::parseFileHeaders() {
   std::error_code EC;
   MemoryBufferRef BufferRef = *Context->Buffer;