[pdbdump] Print out New FPO stream contents.

The data strucutre in the new FPO stream is described in the
PE/COFF spec. There is one record per function if frame pointer
is omitted.

Differential Revision: http://reviews.llvm.org/D20999

llvm-svn: 271926

1 files changed, 24 insertions, 1 deletions

diff --git a/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp b/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp
index e79d6572be1..b1c571bf78c 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp
@@ -186,9 +186,10 @@ Error DbiStream::reload() {
     return EC;
   if (auto EC = initializeSectionMapData())
     return EC;
-
   if (auto EC = initializeFileInfo())
     return EC;
+  if (auto EC = initializeFpoRecords())
+    return EC;
 
   if (Reader.bytesRemaining() > 0)
     return make_error<RawError>(raw_error_code::corrupt_file,
@@ -252,6 +253,10 @@ DbiStream::getSectionHeaders() {
   return SectionHeaders;
 }
 
+codeview::FixedStreamArray<object::FpoData> DbiStream::getFpoRecords() {
+  return FpoRecords;
+}
+
 ArrayRef<ModuleInfoEx> DbiStream::modules() const { return ModuleInfos; }
 codeview::FixedStreamArray<SecMapEntry> DbiStream::getSectionMap() const {
   return SectionMap;
@@ -300,6 +305,24 @@ Error DbiStream::initializeSectionHeadersData() {
   return Error::success();
 }
 
+// Initializes this->Fpos.
+Error DbiStream::initializeFpoRecords() {
+  uint32_t StreamNum = getDebugStreamIndex(DbgHeaderType::NewFPO);
+  FpoStream.reset(new MappedBlockStream(StreamNum, Pdb));
+
+  size_t StreamLen = FpoStream->getLength();
+  if (StreamLen % sizeof(object::FpoData))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Corrupted New FPO stream.");
+
+  size_t NumRecords = StreamLen / sizeof(object::FpoData);
+  codeview::StreamReader Reader(*FpoStream);
+  if (auto EC = Reader.readArray(FpoRecords, NumRecords))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Corrupted New FPO stream.");
+  return Error::success();
+}
+
 Error DbiStream::initializeSectionMapData() {
   StreamReader SMReader(SecMapSubstream);
   const SecMapHeader *Header;