8fed295cee
the frame count is requested or each frame is individually requested. In practice this doesn't seem to help anything because we have functions like StackFrameList::GetNumFrames() which is going to request each frame anyway. And classes like ThreadPlanStepRange and ThreadPlanStepOverRange get the stack depth in their ctor forcing a full stack walk. But at least UnwindLLDB will delay doing a full walk if it can. llvm-svn: 118477
78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
//===-- UnwindLLDB.h --------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef lldb_UnwindLLDB_h_
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#define lldb_UnwindLLDB_h_
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#include "lldb/lldb-private.h"
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#include "lldb/lldb-types.h"
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#include "lldb/Target/Unwind.h"
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#include "lldb/Symbol/FuncUnwinders.h"
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#include "lldb/Symbol/UnwindPlan.h"
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#include "RegisterContextLLDB.h"
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#include "lldb/Target/RegisterContext.h"
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#include <vector>
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namespace lldb_private {
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class UnwindLLDB : public lldb_private::Unwind
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{
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public:
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UnwindLLDB (lldb_private::Thread &thread);
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virtual
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~UnwindLLDB() { }
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void
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Clear()
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{
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m_frames.clear();
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}
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virtual uint32_t
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GetFrameCount();
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bool
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GetFrameInfoAtIndex (uint32_t frame_idx,
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lldb::addr_t& cfa,
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lldb::addr_t& start_pc);
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lldb_private::RegisterContext *
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CreateRegisterContextForFrame (lldb_private::StackFrame *frame);
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private:
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struct Cursor
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{
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lldb::addr_t start_pc; // The start address of the function/symbol for this frame - current pc if unknown
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lldb::addr_t cfa; // The canonical frame address for this stack frame
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lldb_private::SymbolContext sctx; // A symbol context we'll contribute to & provide to the StackFrame creation
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lldb::RegisterContextSP reg_ctx; // These are all RegisterContextLLDB's
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Cursor () : start_pc (LLDB_INVALID_ADDRESS), cfa (LLDB_INVALID_ADDRESS), sctx(), reg_ctx() { }
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private:
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DISALLOW_COPY_AND_ASSIGN (Cursor);
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};
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typedef lldb::SharedPtr<Cursor>::Type CursorSP;
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std::vector<CursorSP> m_frames;
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bool AddOneMoreFrame ();
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bool AddFirstFrame ();
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//------------------------------------------------------------------
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// For UnwindLLDB only
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//------------------------------------------------------------------
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DISALLOW_COPY_AND_ASSIGN (UnwindLLDB);
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};
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}
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#endif // lldb_UnwindLLDB_h_
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