| //===-- AppleObjCTrampolineHandler.h ----------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef lldb_AppleObjCTrampolineHandler_h_ |
| #define lldb_AppleObjCTrampolineHandler_h_ |
| |
| // C Includes |
| // C++ Includes |
| #include <map> |
| #include <mutex> |
| #include <vector> |
| |
| // Other libraries and framework includes |
| // Project includes |
| #include "lldb/Expression/UtilityFunction.h" |
| #include "lldb/lldb-public.h" |
| |
| namespace lldb_private { |
| |
| class AppleObjCTrampolineHandler { |
| public: |
| AppleObjCTrampolineHandler(const lldb::ProcessSP &process_sp, |
| const lldb::ModuleSP &objc_module_sp); |
| |
| ~AppleObjCTrampolineHandler(); |
| |
| lldb::ThreadPlanSP GetStepThroughDispatchPlan(Thread &thread, |
| bool stop_others); |
| |
| FunctionCaller *GetLookupImplementationFunctionCaller(); |
| |
| bool AddrIsMsgForward(lldb::addr_t addr) const { |
| return (addr == m_msg_forward_addr || addr == m_msg_forward_stret_addr); |
| } |
| |
| struct DispatchFunction { |
| public: |
| typedef enum { eFixUpNone, eFixUpFixed, eFixUpToFix } FixUpState; |
| |
| const char *name; |
| bool stret_return; |
| bool is_super; |
| bool is_super2; |
| FixUpState fixedup; |
| }; |
| |
| lldb::addr_t SetupDispatchFunction(Thread &thread, |
| ValueList &dispatch_values); |
| |
| private: |
| static const char *g_lookup_implementation_function_name; |
| static const char *g_lookup_implementation_with_stret_function_code; |
| static const char *g_lookup_implementation_no_stret_function_code; |
| |
| class AppleObjCVTables { |
| public: |
| // These come from objc-gdb.h. |
| enum VTableFlags { |
| eOBJC_TRAMPOLINE_MESSAGE = (1 << 0), // trampoline acts like objc_msgSend |
| eOBJC_TRAMPOLINE_STRET = (1 << 1), // trampoline is struct-returning |
| eOBJC_TRAMPOLINE_VTABLE = (1 << 2) // trampoline is vtable dispatcher |
| }; |
| |
| private: |
| struct VTableDescriptor { |
| VTableDescriptor(uint32_t in_flags, lldb::addr_t in_code_start) |
| : flags(in_flags), code_start(in_code_start) {} |
| |
| uint32_t flags; |
| lldb::addr_t code_start; |
| }; |
| |
| class VTableRegion { |
| public: |
| VTableRegion() |
| : m_valid(false), m_owner(NULL), m_header_addr(LLDB_INVALID_ADDRESS), |
| m_code_start_addr(0), m_code_end_addr(0), m_next_region(0) {} |
| |
| VTableRegion(AppleObjCVTables *owner, lldb::addr_t header_addr); |
| |
| void SetUpRegion(); |
| |
| lldb::addr_t GetNextRegionAddr() { return m_next_region; } |
| |
| lldb::addr_t GetCodeStart() { return m_code_start_addr; } |
| |
| lldb::addr_t GetCodeEnd() { return m_code_end_addr; } |
| |
| uint32_t GetFlagsForVTableAtAddress(lldb::addr_t address) { return 0; } |
| |
| bool IsValid() { return m_valid; } |
| |
| bool AddressInRegion(lldb::addr_t addr, uint32_t &flags); |
| |
| void Dump(Stream &s); |
| |
| public: |
| bool m_valid; |
| AppleObjCVTables *m_owner; |
| lldb::addr_t m_header_addr; |
| lldb::addr_t m_code_start_addr; |
| lldb::addr_t m_code_end_addr; |
| std::vector<VTableDescriptor> m_descriptors; |
| lldb::addr_t m_next_region; |
| }; |
| |
| public: |
| AppleObjCVTables(const lldb::ProcessSP &process_sp, |
| const lldb::ModuleSP &objc_module_sp); |
| |
| ~AppleObjCVTables(); |
| |
| bool InitializeVTableSymbols(); |
| |
| static bool RefreshTrampolines(void *baton, |
| StoppointCallbackContext *context, |
| lldb::user_id_t break_id, |
| lldb::user_id_t break_loc_id); |
| bool ReadRegions(); |
| |
| bool ReadRegions(lldb::addr_t region_addr); |
| |
| bool IsAddressInVTables(lldb::addr_t addr, uint32_t &flags); |
| |
| lldb::ProcessSP GetProcessSP() { return m_process_wp.lock(); } |
| |
| private: |
| lldb::ProcessWP m_process_wp; |
| typedef std::vector<VTableRegion> region_collection; |
| lldb::addr_t m_trampoline_header; |
| lldb::break_id_t m_trampolines_changed_bp_id; |
| region_collection m_regions; |
| lldb::ModuleSP m_objc_module_sp; |
| }; |
| |
| static const DispatchFunction g_dispatch_functions[]; |
| |
| typedef std::map<lldb::addr_t, int> MsgsendMap; // This table maps an dispatch |
| // fn address to the index in |
| // g_dispatch_functions |
| MsgsendMap m_msgSend_map; |
| lldb::ProcessWP m_process_wp; |
| lldb::ModuleSP m_objc_module_sp; |
| const char *m_lookup_implementation_function_code; |
| std::unique_ptr<UtilityFunction> m_impl_code; |
| std::mutex m_impl_function_mutex; |
| lldb::addr_t m_impl_fn_addr; |
| lldb::addr_t m_impl_stret_fn_addr; |
| lldb::addr_t m_msg_forward_addr; |
| lldb::addr_t m_msg_forward_stret_addr; |
| std::unique_ptr<AppleObjCVTables> m_vtables_ap; |
| }; |
| |
| } // namespace lldb_private |
| |
| #endif // lldb_AppleObjCTrampolineHandler_h_ |