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/SymbolContext.h"
21 #include "lldb/Symbol/UnwindPlan.h"
22 #include "lldb/Target/RegisterContext.h"
23 #include "lldb/Target/Unwind.h"
24 #include "lldb/Utility/ConstString.h"
25 #include "lldb/lldb-public.h"
27 namespace lldb_private {
29 class RegisterContextLLDB;
31 class UnwindLLDB : public lldb_private::Unwind {
33 UnwindLLDB(lldb_private::Thread &thread);
35 ~UnwindLLDB() override = default;
37 enum RegisterSearchResult {
44 friend class lldb_private::RegisterContextLLDB;
46 struct RegisterLocation {
47 enum RegisterLocationTypes {
48 eRegisterNotSaved = 0, // register was not preserved by callee. If
49 // volatile reg, is unavailable
50 eRegisterSavedAtMemoryLocation, // register is saved at a specific word of
51 // target mem (target_memory_location)
52 eRegisterInRegister, // register is available in a (possible other)
53 // register (register_number)
54 eRegisterSavedAtHostMemoryLocation, // register is saved at a word in
55 // lldb's address space
56 eRegisterValueInferred, // register val was computed (and is in
58 eRegisterInLiveRegisterContext // register value is in a live (stack frame
63 lldb::addr_t target_memory_location;
65 register_number; // in eRegisterKindLLDB register numbering system
66 void *host_memory_location;
67 uint64_t inferred_value; // eRegisterValueInferred - e.g. stack pointer ==
72 void DoClear() override {
74 m_candidate_frame.reset();
75 m_unwind_complete = false;
78 uint32_t DoGetFrameCount() override;
80 bool DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
81 lldb::addr_t &start_pc) override;
83 lldb::RegisterContextSP
84 DoCreateRegisterContextForFrame(lldb_private::StackFrame *frame) override;
86 typedef std::shared_ptr<RegisterContextLLDB> RegisterContextLLDBSP;
88 // Needed to retrieve the "next" frame (e.g. frame 2 needs to retrieve frame
89 // 1's RegisterContextLLDB)
90 // The RegisterContext for frame_num must already exist or this returns an
91 // empty shared pointer.
92 RegisterContextLLDBSP GetRegisterContextForFrameNum(uint32_t frame_num);
94 // Iterate over the RegisterContextLLDB's in our m_frames vector, look for the
96 // has a saved location for this reg.
97 bool SearchForSavedLocationForRegister(
98 uint32_t lldb_regnum, lldb_private::UnwindLLDB::RegisterLocation ®loc,
99 uint32_t starting_frame_num, bool pc_register);
101 //------------------------------------------------------------------
102 /// Provide the list of user-specified trap handler functions
104 /// The Platform is one source of trap handler function names; that
105 /// may be augmented via a setting. The setting needs to be converted
106 /// into an array of ConstStrings before it can be used - we only want
107 /// to do that once per thread so it's here in the UnwindLLDB object.
110 /// Vector of ConstStrings of trap handler function names. May be
112 //------------------------------------------------------------------
113 const std::vector<ConstString> &GetUserSpecifiedTrapHandlerFunctionNames() {
114 return m_user_supplied_trap_handler_functions;
119 lldb::addr_t start_pc; // The start address of the function/symbol for this
120 // frame - current pc if unknown
121 lldb::addr_t cfa; // The canonical frame address for this stack frame
122 lldb_private::SymbolContext sctx; // A symbol context we'll contribute to &
123 // provide to the StackFrame creation
124 RegisterContextLLDBSP
125 reg_ctx_lldb_sp; // These are all RegisterContextLLDB's
128 : start_pc(LLDB_INVALID_ADDRESS), cfa(LLDB_INVALID_ADDRESS), sctx(),
132 DISALLOW_COPY_AND_ASSIGN(Cursor);
135 typedef std::shared_ptr<Cursor> CursorSP;
136 std::vector<CursorSP> m_frames;
137 CursorSP m_candidate_frame;
138 bool m_unwind_complete; // If this is true, we've enumerated all the frames in
139 // the stack, and m_frames.size() is the
140 // number of frames, etc. Otherwise we've only gone as far as directly asked,
141 // and m_frames.size()
142 // is how far we've currently gone.
144 std::vector<ConstString> m_user_supplied_trap_handler_functions;
146 //-----------------------------------------------------------------
147 // Check if Full UnwindPlan of First frame is valid or not.
148 // If not then try Fallback UnwindPlan of the frame. If Fallback
149 // UnwindPlan succeeds then update the Full UnwindPlan with the
150 // Fallback UnwindPlan.
151 //-----------------------------------------------------------------
152 void UpdateUnwindPlanForFirstFrameIfInvalid(ABI *abi);
154 CursorSP GetOneMoreFrame(ABI *abi);
156 bool AddOneMoreFrame(ABI *abi);
158 bool AddFirstFrame();
160 //------------------------------------------------------------------
161 // For UnwindLLDB only
162 //------------------------------------------------------------------
163 DISALLOW_COPY_AND_ASSIGN(UnwindLLDB);
166 } // namespace lldb_private
168 #endif // lldb_UnwindLLDB_h_