1 files changed, 132 insertions, 0 deletions
diff --git a/lldb/source/Symbol/UnwindTable.cpp b/lldb/source/Symbol/UnwindTable.cpp
new file mode 100644
index 00000000000..dcab1933375
--- /dev/null
+++ b/lldb/source/Symbol/UnwindTable.cpp
@@ -0,0 +1,132 @@
+//===-- UnwindTable.cpp ----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Symbol/ObjectFile.h"
+
+#include "lldb/Symbol/FuncUnwinders.h"
+#include "lldb/Symbol/SymbolContext.h"
+#include "lldb/Core/Section.h"
+#include "lldb/Core/Module.h"
+#include "lldb/lldb-forward.h"
+#include "lldb/Utility/UnwindAssemblyProfiler.h"
+#include "lldb/Symbol/DWARFCallFrameInfo.h"
+
+#include "lldb/Symbol/UnwindTable.h"
+#include <stdio.h>
+
+// There is one UnwindTable object per ObjectFile.
+// It contains a list of Unwind objects -- one per function, populated lazily -- for the ObjectFile.
+// Each Unwind object has multiple UnwindPlans for different scenarios.
+
+using namespace lldb;
+using namespace lldb_private;
+
+UnwindTable::UnwindTable (ObjectFile& objfile) : m_object_file(objfile), 
+                                                 m_unwinds(),
+                                                 m_initialized(false),
+                                                 m_eh_frame(NULL),
+                                                 m_assembly_profiler(NULL)
+{
+}
+
+// We can't do some of this initialization when the ObjectFile is running its ctor; delay doing it
+// until needed for something.
+
+void
+UnwindTable::initialize ()
+{
+    if (m_initialized)
+        return;
+
+    SectionList* sl = m_object_file.GetSectionList ();
+    if (sl)
+    {
+        SectionSP sect = sl->FindSectionByType (eSectionTypeEHFrame, true);
+        if (sect.get())
+        {
+            m_eh_frame = new DWARFCallFrameInfo(m_object_file, sect, eRegisterKindGCC, true);
+        }
+    }
+    
+    ArchSpec arch;
+    ConstString str;
+    m_object_file.GetTargetTriple (str);
+    arch.SetArchFromTargetTriple (str.GetCString());
+    m_assembly_profiler = UnwindAssemblyProfiler::FindPlugin (arch);
+
+    m_initialized = true;
+}
+
+UnwindTable::~UnwindTable ()
+{
+    if (m_eh_frame)
+        delete m_eh_frame;
+}
+
+FuncUnwindersSP
+UnwindTable::GetFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc)
+{
+    FuncUnwindersSP no_unwind_found;
+
+    initialize();
+
+    // Create a FuncUnwinders object for the binary search below
+    AddressRange search_range(addr, 1);
+    FuncUnwindersSP search_unwind(new FuncUnwinders (*this, NULL, search_range));
+
+    const_iterator idx;
+    idx = std::lower_bound (m_unwinds.begin(), m_unwinds.end(), search_unwind);
+
+    bool found_match = true;
+    if (m_unwinds.size() == 0)
+    {
+        found_match = false;
+    }
+    else if (idx == m_unwinds.end())
+    {
+        --idx;
+    }
+    if (idx != m_unwinds.begin() && (*idx)->GetFunctionStartAddress().GetOffset() != addr.GetOffset())
+    {
+       --idx;
+    }
+    if (found_match && (*idx)->ContainsAddress (addr))
+    {
+        return *idx;
+    }
+
+    AddressRange range;
+    if (sc.GetAddressRange(eSymbolContextFunction | eSymbolContextSymbol, range))
+    {
+        FuncUnwindersSP unw(new FuncUnwinders(*this, m_assembly_profiler, range));
+        m_unwinds.push_back (unw);
+        std::sort (m_unwinds.begin(), m_unwinds.end());
+        return unw;
+    }
+    else
+    {
+        // Does the eh_frame unwind info has a function bounds defined for this addr?
+        if (m_eh_frame->GetAddressRange (addr, range))
+        {
+            FuncUnwindersSP unw(new FuncUnwinders(*this, m_assembly_profiler, range));
+            m_unwinds.push_back (unw);
+            std::sort (m_unwinds.begin(), m_unwinds.end());
+            return unw;
+            // FIXME we should create a syntheic Symbol based on the address range with a synthesized symbol name
+        }
+    }
+    return no_unwind_found;
+}
+
+DWARFCallFrameInfo *
+UnwindTable::GetEHFrameInfo ()
+{
+    initialize();
+    return m_eh_frame;
+}