1 files changed, 149 insertions, 0 deletions
diff --git a/include/lldb/Target/StackID.h b/include/lldb/Target/StackID.h
new file mode 100644
index 000000000000..7e713c73d972
--- /dev/null
+++ b/include/lldb/Target/StackID.h
@@ -0,0 +1,149 @@
+//===-- StackID.h -----------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_StackID_h_
+#define liblldb_StackID_h_
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+// Project includes
+#include "lldb/lldb-private.h"
+#include "lldb/Core/AddressRange.h"
+
+namespace lldb_private {
+
+class StackID
+{
+public:
+    //------------------------------------------------------------------
+    // Constructors and Destructors
+    //------------------------------------------------------------------
+    StackID () :
+        m_pc (LLDB_INVALID_ADDRESS),
+        m_cfa (LLDB_INVALID_ADDRESS),
+        m_symbol_scope (NULL)
+    {
+    }
+
+    explicit 
+    StackID (lldb::addr_t pc, lldb::addr_t cfa, SymbolContextScope *symbol_scope) :
+        m_pc (pc),
+        m_cfa (cfa),
+        m_symbol_scope (symbol_scope)
+    {
+    }
+
+    StackID (const StackID& rhs) :
+        m_pc (rhs.m_pc),
+        m_cfa (rhs.m_cfa),
+        m_symbol_scope (rhs.m_symbol_scope)
+    {
+    }
+
+    ~StackID()
+    {
+    }
+
+    lldb::addr_t
+    GetPC() const
+    {
+        return m_pc;
+    }
+    
+    lldb::addr_t
+    GetCallFrameAddress() const
+    {
+        return m_cfa;
+    }
+
+    SymbolContextScope *
+    GetSymbolContextScope () const
+    {
+        return m_symbol_scope;
+    }
+    
+    void
+    SetSymbolContextScope (SymbolContextScope *symbol_scope)
+    {
+        m_symbol_scope = symbol_scope;
+    }
+
+    void
+    Clear ()
+    {
+        m_pc = LLDB_INVALID_ADDRESS;
+        m_cfa = LLDB_INVALID_ADDRESS;
+        m_symbol_scope = NULL;
+    }
+    
+    bool
+    IsValid () const
+    {
+        return m_pc != LLDB_INVALID_ADDRESS || m_cfa != LLDB_INVALID_ADDRESS;
+    }
+    
+    void
+    Dump (Stream *s);
+
+    //------------------------------------------------------------------
+    // Operators
+    //------------------------------------------------------------------
+    const StackID&
+    operator=(const StackID& rhs)
+    {
+        if (this != &rhs)
+        {
+            m_pc = rhs.m_pc;
+            m_cfa = rhs.m_cfa;
+            m_symbol_scope = rhs.m_symbol_scope;
+        }
+        return *this;
+    }
+
+protected:
+
+    friend class StackFrame;
+    
+    void
+    SetPC (lldb::addr_t pc)
+    {
+        m_pc = pc;
+    }
+
+
+    //------------------------------------------------------------------
+    // Classes that inherit from StackID can see and modify these
+    //------------------------------------------------------------------
+    lldb::addr_t m_pc;                  // The pc value for the function/symbol for this frame. This will
+                                        // only get used if the symbol scope is NULL (the code where we are
+                                        // stopped is not represented by any function or symbol in any
+                                        // shared library).
+    lldb::addr_t m_cfa;                 // The call frame address (stack pointer) value
+                                        // at the beginning of the function that uniquely
+                                        // identifies this frame (along with m_symbol_scope below)
+    SymbolContextScope *m_symbol_scope; // If NULL, there is no block or symbol for this frame.
+                                        // If not NULL, this will either be the scope for the 
+                                        // lexical block for the frame, or the scope 
+                                        // for the symbol. Symbol context scopes are 
+                                        // always be unique pointers since the are part
+                                        // of the Block and Symbol objects and can easily
+                                        // be used to tell if a stack ID is the same as 
+                                        // another.
+};
+
+bool operator== (const StackID& lhs, const StackID& rhs);
+bool operator!= (const StackID& lhs, const StackID& rhs);
+
+// frame_id_1 < frame_id_2 means "frame_id_1 is YOUNGER than frame_id_2"
+bool operator<  (const StackID& lhs, const StackID& rhs);
+
+} // namespace lldb_private
+
+#endif  // liblldb_StackID_h_