Pass a filename instead of a msf::WritableStream to PDBFileBuilder::commit.

WritableStream needs the exact file size to open a file, but
until we fix the final layout of a PDB file, we don't know the
size of the file.

This patch changes the parameter type of PDBFileBuilder::commit
to solve that chiecken-and-egg problem. Now the function opens
a file after fixing the layout, so it can create a file with the
exact size.

Differential Revision: https://reviews.llvm.org/D25107

llvm-svn: 282940

1 files changed, 11 insertions, 3 deletions

diff --git a/llvm/lib/DebugInfo/PDB/Raw/PDBFileBuilder.cpp b/llvm/lib/DebugInfo/PDB/Raw/PDBFileBuilder.cpp
index 165b03cf370..5b9f9461608 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/PDBFileBuilder.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/PDBFileBuilder.cpp
@@ -14,6 +14,7 @@
 #include "llvm/DebugInfo/MSF/MSFBuilder.h"
 #include "llvm/DebugInfo/MSF/StreamInterface.h"
 #include "llvm/DebugInfo/MSF/StreamWriter.h"
+#include "llvm/DebugInfo/PDB/GenericError.h"
 #include "llvm/DebugInfo/PDB/Raw/DbiStream.h"
 #include "llvm/DebugInfo/PDB/Raw/DbiStreamBuilder.h"
 #include "llvm/DebugInfo/PDB/Raw/InfoStream.h"
@@ -138,13 +139,20 @@ PDBFileBuilder::build(std::unique_ptr<msf::WritableStream> PdbFileBuffer) {
   return std::move(File);
 }
 
-Error PDBFileBuilder::commit(const msf::WritableStream &Buffer) {
-  StreamWriter Writer(Buffer);
+Error PDBFileBuilder::commit(StringRef Filename) {
   auto ExpectedLayout = finalizeMsfLayout();
   if (!ExpectedLayout)
     return ExpectedLayout.takeError();
   auto &Layout = *ExpectedLayout;
 
+  uint64_t Filesize = Layout.SB->BlockSize * Layout.SB->NumBlocks;
+  auto OutFileOrError = FileOutputBuffer::create(Filename, Filesize);
+  if (OutFileOrError.getError())
+    return llvm::make_error<pdb::GenericError>(generic_error_code::invalid_path,
+                                               Filename);
+  FileBufferByteStream Buffer(std::move(*OutFileOrError));
+  StreamWriter Writer(Buffer);
+
   if (auto EC = Writer.writeObject(*Layout.SB))
     return EC;
   uint32_t BlockMapOffset =
@@ -189,4 +197,4 @@ Error PDBFileBuilder::commit(const msf::WritableStream &Buffer) {
   }
 
   return Buffer.commit();
-}
\ No newline at end of file
+}