1 //===-- UnwindLLDB.h --------------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef lldb_UnwindLLDB_h_
11 #define lldb_UnwindLLDB_h_
17 // Other libraries and framework includes
19 #include "lldb/Symbol/FuncUnwinders.h"
20 #include "lldb/Symbol/UnwindPlan.h"
21 #include "lldb/Target/RegisterContext.h"
22 #include "lldb/Target/Unwind.h"
23 #include "lldb/Utility/ConstString.h"
24 #include "lldb/lldb-public.h"
26 namespace lldb_private {
28 class RegisterContextLLDB;
30 class UnwindLLDB : public lldb_private::Unwind {
32 UnwindLLDB(lldb_private::Thread &thread);
34 ~UnwindLLDB() override = default;
36 enum RegisterSearchResult {
43 friend class lldb_private::RegisterContextLLDB;
45 struct RegisterLocation {
46 enum RegisterLocationTypes {
47 eRegisterNotSaved = 0, // register was not preserved by callee. If
48 // volatile reg, is unavailable
49 eRegisterSavedAtMemoryLocation, // register is saved at a specific word of
50 // target mem (target_memory_location)
51 eRegisterInRegister, // register is available in a (possible other)
52 // register (register_number)
53 eRegisterSavedAtHostMemoryLocation, // register is saved at a word in
54 // lldb's address space
55 eRegisterValueInferred, // register val was computed (and is in
57 eRegisterInLiveRegisterContext // register value is in a live (stack frame
62 lldb::addr_t target_memory_location;
64 register_number; // in eRegisterKindLLDB register numbering system
65 void *host_memory_location;
66 uint64_t inferred_value; // eRegisterValueInferred - e.g. stack pointer ==
71 void DoClear() override {
73 m_candidate_frame.reset();
74 m_unwind_complete = false;
77 uint32_t DoGetFrameCount() override;
79 bool DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
80 lldb::addr_t &start_pc) override;
82 lldb::RegisterContextSP
83 DoCreateRegisterContextForFrame(lldb_private::StackFrame *frame) override;
85 typedef std::shared_ptr<RegisterContextLLDB> RegisterContextLLDBSP;
87 // Needed to retrieve the "next" frame (e.g. frame 2 needs to retrieve frame
88 // 1's RegisterContextLLDB)
89 // The RegisterContext for frame_num must already exist or this returns an
90 // empty shared pointer.
91 RegisterContextLLDBSP GetRegisterContextForFrameNum(uint32_t frame_num);
93 // Iterate over the RegisterContextLLDB's in our m_frames vector, look for the
95 // has a saved location for this reg.
96 bool SearchForSavedLocationForRegister(
97 uint32_t lldb_regnum, lldb_private::UnwindLLDB::RegisterLocation ®loc,
98 uint32_t starting_frame_num, bool pc_register);
100 //------------------------------------------------------------------
101 /// Provide the list of user-specified trap handler functions
103 /// The Platform is one source of trap handler function names; that
104 /// may be augmented via a setting. The setting needs to be converted
105 /// into an array of ConstStrings before it can be used - we only want
106 /// to do that once per thread so it's here in the UnwindLLDB object.
109 /// Vector of ConstStrings of trap handler function names. May be
111 //------------------------------------------------------------------
112 const std::vector<ConstString> &GetUserSpecifiedTrapHandlerFunctionNames() {
113 return m_user_supplied_trap_handler_functions;
118 lldb::addr_t start_pc; // The start address of the function/symbol for this
119 // frame - current pc if unknown
120 lldb::addr_t cfa; // The canonical frame address for this stack frame
121 lldb_private::SymbolContext sctx; // A symbol context we'll contribute to &
122 // provide to the StackFrame creation
123 RegisterContextLLDBSP
124 reg_ctx_lldb_sp; // These are all RegisterContextLLDB's
127 : start_pc(LLDB_INVALID_ADDRESS), cfa(LLDB_INVALID_ADDRESS), sctx(),
131 DISALLOW_COPY_AND_ASSIGN(Cursor);
134 typedef std::shared_ptr<Cursor> CursorSP;
135 std::vector<CursorSP> m_frames;
136 CursorSP m_candidate_frame;
137 bool m_unwind_complete; // If this is true, we've enumerated all the frames in
138 // the stack, and m_frames.size() is the
139 // number of frames, etc. Otherwise we've only gone as far as directly asked,
140 // and m_frames.size()
141 // is how far we've currently gone.
143 std::vector<ConstString> m_user_supplied_trap_handler_functions;
145 //-----------------------------------------------------------------
146 // Check if Full UnwindPlan of First frame is valid or not.
147 // If not then try Fallback UnwindPlan of the frame. If Fallback
148 // UnwindPlan succeeds then update the Full UnwindPlan with the
149 // Fallback UnwindPlan.
150 //-----------------------------------------------------------------
151 void UpdateUnwindPlanForFirstFrameIfInvalid(ABI *abi);
153 CursorSP GetOneMoreFrame(ABI *abi);
155 bool AddOneMoreFrame(ABI *abi);
157 bool AddFirstFrame();
159 //------------------------------------------------------------------
160 // For UnwindLLDB only
161 //------------------------------------------------------------------
162 DISALLOW_COPY_AND_ASSIGN(UnwindLLDB);
165 } // namespace lldb_private
167 #endif // lldb_UnwindLLDB_h_