commit f5c59654f7c8438294ecb6ac0b8613782e0d3956
author Zachary Turner <zturner@google.com> Tue May 03 00:28:21 2016 +0000
committer Zachary Turner <zturner@google.com> Tue May 03 00:28:21 2016 +0000
tree 8d242825d7c9ecf7eebccc365b729d0bdf04856a
parent 88bb163f816d00d2805b6a0d97ea0f4200b84553

Parse the TPI (type information) stream of PDB files.

This parses the TPI stream (stream 2) from the PDB file. This stream
contains some header information followed by a series of codeview records.
There is some additional complexity here in that alongside this stream of
codeview records is a serialized hash table in order to efficiently query
the types. We parse the necessary bookkeeping information to allow us to
reconstruct the hash table, but we do not actually construct it yet as
there are still a few things that need to be understood first.

Differential Revision: http://reviews.llvm.org/D19840
Reviewed By: ruiu, rnk

llvm-svn: 268343

llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp

diff --git a/llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp b/llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp
index df47ced..05b3dc7 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/PDBFile.cpp
@@ -11,6 +11,7 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/DebugInfo/PDB/Raw/DbiStream.h"
 #include "llvm/DebugInfo/PDB/Raw/InfoStream.h"
+#include "llvm/DebugInfo/PDB/Raw/TpiStream.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/MemoryBuffer.h"
 
@@ -119,6 +120,8 @@
 std::error_code PDBFile::parseFileHeaders() {
   std::error_code EC;
   MemoryBufferRef BufferRef = *Context->Buffer;
+  // Make sure the file is sufficiently large to hold a super block.
+  // Do this before attempting to read the super block.
   if (BufferRef.getBufferSize() < sizeof(SuperBlock))
     return std::make_error_code(std::errc::illegal_byte_sequence);
 
@@ -135,10 +138,6 @@
   if (BufferRef.getBufferSize() % SB->BlockSize != 0)
     return std::make_error_code(std::errc::illegal_byte_sequence);
 
-  // Make sure the file is sufficiently large to hold a super block.
-  if (BufferRef.getBufferSize() < sizeof(SuperBlock))
-    return std::make_error_code(std::errc::illegal_byte_sequence);
-
   // Check the magic bytes.
   if (memcmp(SB->MagicBytes, Magic, sizeof(Magic)) != 0)
     return std::make_error_code(std::errc::illegal_byte_sequence);
@@ -271,3 +270,11 @@
   }
   return *Dbi;
 }
+
+TpiStream &PDBFile::getPDBTpiStream() {
+  if (!Tpi) {
+    Tpi.reset(new TpiStream(*this));
+    Tpi->reload();
+  }
+  return *Tpi;
+}