1 files changed, 125 insertions, 0 deletions
diff --git a/contrib/llvm/tools/lldb/source/Plugins/Process/Utility/UnwindLLDB.h b/contrib/llvm/tools/lldb/source/Plugins/Process/Utility/UnwindLLDB.h
new file mode 100644
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+++ b/contrib/llvm/tools/lldb/source/Plugins/Process/Utility/UnwindLLDB.h
@@ -0,0 +1,125 @@
+//===-- UnwindLLDB.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_UnwindLLDB_h_
+#define lldb_UnwindLLDB_h_
+
+#include <vector>
+
+#include "lldb/lldb-public.h"
+#include "lldb/Symbol/FuncUnwinders.h"
+#include "lldb/Symbol/UnwindPlan.h"
+#include "lldb/Target/RegisterContext.h"
+#include "lldb/Target/Unwind.h"
+
+namespace lldb_private {
+
+class RegisterContextLLDB;
+
+class UnwindLLDB : public lldb_private::Unwind
+{
+public: 
+    UnwindLLDB (lldb_private::Thread &thread);
+    
+    virtual
+    ~UnwindLLDB() { }
+
+    enum RegisterSearchResult
+    {
+        eRegisterFound = 0,
+        eRegisterNotFound,
+        eRegisterIsVolatile
+    };
+
+protected:
+    friend class lldb_private::RegisterContextLLDB;
+
+    struct RegisterLocation {
+        enum RegisterLocationTypes
+        {
+            eRegisterNotSaved = 0,              // register was not preserved by callee.  If volatile reg, is unavailable
+            eRegisterSavedAtMemoryLocation,     // register is saved at a specific word of target mem (target_memory_location)
+            eRegisterInRegister,                // register is available in a (possible other) register (register_number)
+            eRegisterSavedAtHostMemoryLocation, // register is saved at a word in lldb's address space
+            eRegisterValueInferred              // register val was computed (and is in inferred_value)
+        };
+        int type;
+        union
+        {
+            lldb::addr_t target_memory_location;
+            uint32_t     register_number;       // in eRegisterKindLLDB register numbering system
+            void*        host_memory_location;
+            uint64_t     inferred_value;        // eRegisterValueInferred - e.g. stack pointer == cfa + offset
+        } location;
+    };
+
+    void
+    DoClear()
+    {
+        m_frames.clear();
+        m_unwind_complete = false;
+    }
+
+    virtual uint32_t
+    DoGetFrameCount();
+
+    bool
+    DoGetFrameInfoAtIndex (uint32_t frame_idx,
+                         lldb::addr_t& cfa, 
+                         lldb::addr_t& start_pc);
+    
+    lldb::RegisterContextSP
+    DoCreateRegisterContextForFrame (lldb_private::StackFrame *frame);
+
+    typedef std::shared_ptr<RegisterContextLLDB> RegisterContextLLDBSP;
+
+    // Needed to retrieve the "next" frame (e.g. frame 2 needs to retrieve frame 1's RegisterContextLLDB)
+    // The RegisterContext for frame_num must already exist or this returns an empty shared pointer.
+    RegisterContextLLDBSP
+    GetRegisterContextForFrameNum (uint32_t frame_num);
+
+    // Iterate over the RegisterContextLLDB's in our m_frames vector, look for the first one that
+    // has a saved location for this reg.
+    bool
+    SearchForSavedLocationForRegister (uint32_t lldb_regnum, lldb_private::UnwindLLDB::RegisterLocation &regloc, uint32_t starting_frame_num, bool pc_register);
+
+
+private:
+
+    struct Cursor
+    {
+        lldb::addr_t start_pc;  // The start address of the function/symbol for this frame - current pc if unknown
+        lldb::addr_t cfa;       // The canonical frame address for this stack frame
+        lldb_private::SymbolContext sctx;  // A symbol context we'll contribute to & provide to the StackFrame creation
+        RegisterContextLLDBSP reg_ctx_lldb_sp; // These are all RegisterContextLLDB's
+
+        Cursor () : start_pc (LLDB_INVALID_ADDRESS), cfa (LLDB_INVALID_ADDRESS), sctx(), reg_ctx_lldb_sp() { }
+    private:
+        DISALLOW_COPY_AND_ASSIGN (Cursor);
+    };
+
+    typedef std::shared_ptr<Cursor> CursorSP;
+    std::vector<CursorSP> m_frames;
+    bool m_unwind_complete; // If this is true, we've enumerated all the frames in the stack, and m_frames.size() is the 
+                            // number of frames, etc.  Otherwise we've only gone as far as directly asked, and m_frames.size()
+                            // is how far we've currently gone.
+ 
+
+    bool AddOneMoreFrame (ABI *abi);
+    bool AddFirstFrame ();
+
+    //------------------------------------------------------------------
+    // For UnwindLLDB only
+    //------------------------------------------------------------------
+    DISALLOW_COPY_AND_ASSIGN (UnwindLLDB);
+};
+
+}   // namespace lldb_private
+
+#endif  // lldb_UnwindLLDB_h_