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authorEd Maste <emaste@FreeBSD.org>2013-08-23 17:46:38 +0000
committerEd Maste <emaste@FreeBSD.org>2013-08-23 17:46:38 +0000
commitf034231a6a1fd5d6395206c1651de8cd9402cca3 (patch)
treef561dabc721ad515599172c16da3a4400b7f4aec /source/Symbol/UnwindTable.cpp
downloadsrc-f034231a6a1fd5d6395206c1651de8cd9402cca3.tar.gz
src-f034231a6a1fd5d6395206c1651de8cd9402cca3.zip
Import lldb as of SVN r188801
(A number of files not required for the FreeBSD build have been removed.) Sponsored by: DARPA, AFRL
Notes
Notes: svn path=/vendor/lldb/dist/; revision=254721
Diffstat (limited to 'source/Symbol/UnwindTable.cpp')
-rw-r--r--source/Symbol/UnwindTable.cpp153
1 files changed, 153 insertions, 0 deletions
diff --git a/source/Symbol/UnwindTable.cpp b/source/Symbol/UnwindTable.cpp
new file mode 100644
index 000000000000..c77628bf7dd8
--- /dev/null
+++ b/source/Symbol/UnwindTable.cpp
@@ -0,0 +1,153 @@
+//===-- 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/UnwindTable.h"
+
+#include <stdio.h>
+
+#include "lldb/Core/Module.h"
+#include "lldb/Core/Section.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Symbol/FuncUnwinders.h"
+#include "lldb/Symbol/SymbolContext.h"
+#include "lldb/Symbol/DWARFCallFrameInfo.h"
+#include "lldb/Target/UnwindAssembly.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_assembly_profiler (NULL),
+ m_eh_frame (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;
+ if (m_object_file.GetArchitecture (arch))
+ {
+ m_assembly_profiler = UnwindAssembly::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();
+
+ // There is an UnwindTable per object file, so we can safely use file handles
+ addr_t file_addr = addr.GetFileAddress();
+ iterator end = m_unwinds.end ();
+ iterator insert_pos = end;
+ if (!m_unwinds.empty())
+ {
+ insert_pos = m_unwinds.lower_bound (file_addr);
+ iterator pos = insert_pos;
+ if ((pos == m_unwinds.end ()) || (pos != m_unwinds.begin() && pos->second->GetFunctionStartAddress() != addr))
+ --pos;
+
+ if (pos->second->ContainsAddress (addr))
+ return pos->second;
+ }
+
+ AddressRange range;
+ if (!sc.GetAddressRange(eSymbolContextFunction | eSymbolContextSymbol, 0, false, range) || !range.GetBaseAddress().IsValid())
+ {
+ // Does the eh_frame unwind info has a function bounds for this addr?
+ if (m_eh_frame == NULL || !m_eh_frame->GetAddressRange (addr, range))
+ {
+ return no_unwind_found;
+ }
+ }
+
+ FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, m_assembly_profiler, range));
+ m_unwinds.insert (insert_pos, std::make_pair(range.GetBaseAddress().GetFileAddress(), func_unwinder_sp));
+// StreamFile s(stdout);
+// Dump (s);
+ return func_unwinder_sp;
+}
+
+// Ignore any existing FuncUnwinders for this function, create a new one and don't add it to the
+// UnwindTable. This is intended for use by target modules show-unwind where we want to create
+// new UnwindPlans, not re-use existing ones.
+
+FuncUnwindersSP
+UnwindTable::GetUncachedFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc)
+{
+ FuncUnwindersSP no_unwind_found;
+ Initialize();
+
+ AddressRange range;
+ if (!sc.GetAddressRange(eSymbolContextFunction | eSymbolContextSymbol, 0, false, range) || !range.GetBaseAddress().IsValid())
+ {
+ // Does the eh_frame unwind info has a function bounds for this addr?
+ if (m_eh_frame == NULL || !m_eh_frame->GetAddressRange (addr, range))
+ {
+ return no_unwind_found;
+ }
+ }
+
+ FuncUnwindersSP func_unwinder_sp(new FuncUnwinders(*this, m_assembly_profiler, range));
+ return func_unwinder_sp;
+}
+
+
+void
+UnwindTable::Dump (Stream &s)
+{
+ s.Printf("UnwindTable for '%s':\n", m_object_file.GetFileSpec().GetPath().c_str());
+ const_iterator begin = m_unwinds.begin();
+ const_iterator end = m_unwinds.end();
+ for (const_iterator pos = begin; pos != end; ++pos)
+ {
+ s.Printf ("[%u] 0x%16.16" PRIx64 "\n", (unsigned)std::distance (begin, pos), pos->first);
+ }
+ s.EOL();
+}
+
+DWARFCallFrameInfo *
+UnwindTable::GetEHFrameInfo ()
+{
+ Initialize();
+ return m_eh_frame;
+}