1 //===-- x86AssemblyInspectionEngine.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 liblldb_x86AssemblyInspectionEngine_h_
11 #define liblldb_x86AssemblyInspectionEngine_h_
13 #include "llvm-c/Disassembler.h"
15 #include "lldb/lldb-enumerations.h"
16 #include "lldb/lldb-forward.h"
17 #include "lldb/lldb-private.h"
19 #include "lldb/Core/ArchSpec.h"
20 #include "lldb/Utility/ConstString.h"
25 namespace lldb_private {
27 // x86AssemblyInspectionEngine - a class which will take a buffer of bytes
28 // of i386/x86_64 instructions and create an UnwindPlan based on those
29 // assembly instructions.
30 class x86AssemblyInspectionEngine {
34 x86AssemblyInspectionEngine(const lldb_private::ArchSpec &arch);
37 ~x86AssemblyInspectionEngine();
39 /// One of the two initialize methods that can be called on this object;
40 /// they must be called before any of the assembly inspection methods
41 /// are called. This one should be used if the caller has access to a
42 /// valid RegisterContext.
43 void Initialize(lldb::RegisterContextSP ®_ctx);
45 /// One of the two initialize methods that can be called on this object;
46 /// they must be called before any of the assembly inspection methods
47 /// are called. This one takes a vector of register name and lldb
49 struct lldb_reg_info {
52 lldb_reg_info() : name(nullptr), lldb_regnum(LLDB_INVALID_REGNUM) {}
54 void Initialize(std::vector<lldb_reg_info> ®_info);
56 /// Create an UnwindPlan for a "non-call site" stack frame situation.
57 /// This is usually when this function/method is currently executing, and may
59 /// a location where exception-handling style unwind information (eh_frame,
60 /// compact unwind info, arm unwind info)
62 /// \p data is a pointer to the instructions for the function
63 /// \p size is the size of the instruction buffer above
64 /// \p func_range is the start Address and size of the function, to be
65 /// included in the UnwindPlan
66 /// \p unwind_plan is the unwind plan that this method creates
67 /// \returns true if it was able to create an UnwindPlan; false if not.
69 GetNonCallSiteUnwindPlanFromAssembly(uint8_t *data, size_t size,
70 lldb_private::AddressRange &func_range,
71 lldb_private::UnwindPlan &unwind_plan);
73 /// Take an existing UnwindPlan, probably from eh_frame which may be missing
75 /// of the epilogue instructions, and add the epilogue description to it based
77 /// instructions in the function.
79 /// The \p unwind_plan 's register numbers must be converted into the lldb
80 /// register numbering
81 /// scheme OR a RegisterContext must be provided in \p reg_ctx. If the \p
83 /// register numbers are already in lldb register numbering, \p reg_ctx may be
85 /// \returns true if the \p unwind_plan was updated, false if it was not.
86 bool AugmentUnwindPlanFromCallSite(uint8_t *data, size_t size,
87 lldb_private::AddressRange &func_range,
88 lldb_private::UnwindPlan &unwind_plan,
89 lldb::RegisterContextSP ®_ctx);
91 bool FindFirstNonPrologueInstruction(uint8_t *data, size_t size,
95 bool nonvolatile_reg_p(int machine_regno);
96 bool push_rbp_pattern_p();
97 bool push_0_pattern_p();
98 bool push_imm_pattern_p();
99 bool push_extended_pattern_p();
100 bool push_misc_reg_p();
101 bool mov_rsp_rbp_pattern_p();
102 bool sub_rsp_pattern_p(int &amount);
103 bool add_rsp_pattern_p(int &amount);
104 bool lea_rsp_pattern_p(int &amount);
105 bool lea_rbp_rsp_pattern_p(int &amount);
106 bool push_reg_p(int ®no);
107 bool pop_reg_p(int ®no);
108 bool pop_rbp_pattern_p();
109 bool pop_misc_reg_p();
110 bool leave_pattern_p();
111 bool call_next_insn_pattern_p();
112 bool mov_reg_to_local_stack_frame_p(int ®no, int &rbp_offset);
113 bool ret_pattern_p();
114 uint32_t extract_4(uint8_t *b);
116 bool instruction_length(uint8_t *insn, int &length, uint32_t buffer_remaining_bytes);
118 bool machine_regno_to_lldb_regno(int machine_regno, uint32_t &lldb_regno);
120 enum CPU { k_i386, k_x86_64, k_cpu_unspecified };
122 enum i386_register_numbers {
134 enum x86_64_register_numbers {
154 enum { kMaxInstructionByteSize = 32 };
158 uint32_t m_machine_ip_regnum;
159 uint32_t m_machine_sp_regnum;
160 uint32_t m_machine_fp_regnum;
161 uint32_t m_lldb_ip_regnum;
162 uint32_t m_lldb_sp_regnum;
163 uint32_t m_lldb_fp_regnum;
165 typedef std::map<uint32_t, lldb_reg_info> MachineRegnumToNameAndLLDBRegnum;
167 MachineRegnumToNameAndLLDBRegnum m_reg_map;
169 lldb_private::ArchSpec m_arch;
173 bool m_register_map_initialized;
175 ::LLVMDisasmContextRef m_disasm_context;
177 DISALLOW_COPY_AND_ASSIGN(x86AssemblyInspectionEngine);
180 } // namespace lldb_private
182 #endif // liblldb_x86AssemblyInspectionEngine_h_