[PDB] Fix location retrieval for function local variables and arguments that are

stored relative to VFRAME

Summary:
This patch makes LLDB able to retrieve proper values for function arguments and
local variables stored in PDB relative to VFRAME register.

Patch contains retrieval of corresponding FPO table entries from PDB and a
generic translator from FPO programs to DWARF expressions to get correct VFRAME
value.

Patch also improves variables-locations.test and makes this test passable on
x86.

Patch By: leonid.mashinsky

Reviewers: zturner, asmith, stella.stamenova, aleksandr.urakov

Reviewed By: zturner

Subscribers: arphaman, labath, mgorny, aprantl, JDevlieghere, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D55122

llvm-svn: 352845

1 files changed, 25 insertions, 0 deletions

diff --git a/lldb/source/Plugins/SymbolFile/NativePDB/CodeViewRegisterMapping.h b/lldb/source/Plugins/SymbolFile/NativePDB/CodeViewRegisterMapping.h
new file mode 100644
index 00000000000..b29e224b86f
--- /dev/null
+++ b/lldb/source/Plugins/SymbolFile/NativePDB/CodeViewRegisterMapping.h
@@ -0,0 +1,25 @@
+//===-- CodeViewRegisterMapping.h -------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef lldb_Plugins_SymbolFile_PDB_CodeViewRegisterMapping_h_
+#define lldb_Plugins_SymbolFile_PDB_CodeViewRegisterMapping_h_
+
+#include "llvm/ADT/Triple.h"
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+
+namespace lldb_private {
+namespace npdb {
+
+uint32_t GetLLDBRegisterNumber(llvm::Triple::ArchType arch_type,
+                               llvm::codeview::RegisterId register_id);
+
+} // namespace npdb
+} // namespace lldb_private
+
+#endif