diff options
Diffstat (limited to 'include/lldb/Symbol/DWARFCallFrameInfo.h')
| -rw-r--r-- | include/lldb/Symbol/DWARFCallFrameInfo.h | 243 |
1 files changed, 115 insertions, 128 deletions
diff --git a/include/lldb/Symbol/DWARFCallFrameInfo.h b/include/lldb/Symbol/DWARFCallFrameInfo.h index da7f87ced0a0..c221a36bd6c8 100644 --- a/include/lldb/Symbol/DWARFCallFrameInfo.h +++ b/include/lldb/Symbol/DWARFCallFrameInfo.h @@ -32,138 +32,125 @@ namespace lldb_private { // eh_frame / debug_frame, and one to generate an UnwindPlan based // on the FDE in the eh_frame / debug_frame section. -class DWARFCallFrameInfo -{ +class DWARFCallFrameInfo { public: - - DWARFCallFrameInfo (ObjectFile& objfile, - lldb::SectionSP& section, - lldb::RegisterKind reg_kind, - bool is_eh_frame); - - ~DWARFCallFrameInfo(); - - // Locate an AddressRange that includes the provided Address in this - // object's eh_frame/debug_info - // Returns true if a range is found to cover that address. - bool - GetAddressRange (Address addr, AddressRange &range); - - // Return an UnwindPlan based on the call frame information encoded - // in the FDE of this DWARFCallFrameInfo section. - bool - GetUnwindPlan (Address addr, UnwindPlan& unwind_plan); - - typedef RangeVector<lldb::addr_t, uint32_t> FunctionAddressAndSizeVector; - - //------------------------------------------------------------------ - // Build a vector of file address and size for all functions in this Module - // based on the eh_frame FDE entries. - // - // The eh_frame information can be a useful source of file address and size of - // the functions in a Module. Often a binary's non-exported symbols are stripped - // before shipping so lldb won't know the start addr / size of many functions - // in the Module. But the eh_frame can help to give the addresses of these - // stripped symbols, at least. - // - // @param[out] function_info - // A vector provided by the caller is filled out. May be empty if no FDEs/no eh_frame - // is present in this Module. - - void - GetFunctionAddressAndSizeVector (FunctionAddressAndSizeVector &function_info); - - void - ForEachFDEEntries(const std::function<bool(lldb::addr_t, uint32_t, dw_offset_t)>& callback); + DWARFCallFrameInfo(ObjectFile &objfile, lldb::SectionSP §ion, + lldb::RegisterKind reg_kind, bool is_eh_frame); + + ~DWARFCallFrameInfo(); + + // Locate an AddressRange that includes the provided Address in this + // object's eh_frame/debug_info + // Returns true if a range is found to cover that address. + bool GetAddressRange(Address addr, AddressRange &range); + + // Return an UnwindPlan based on the call frame information encoded + // in the FDE of this DWARFCallFrameInfo section. + bool GetUnwindPlan(Address addr, UnwindPlan &unwind_plan); + + typedef RangeVector<lldb::addr_t, uint32_t> FunctionAddressAndSizeVector; + + //------------------------------------------------------------------ + // Build a vector of file address and size for all functions in this Module + // based on the eh_frame FDE entries. + // + // The eh_frame information can be a useful source of file address and size of + // the functions in a Module. Often a binary's non-exported symbols are + // stripped + // before shipping so lldb won't know the start addr / size of many functions + // in the Module. But the eh_frame can help to give the addresses of these + // stripped symbols, at least. + // + // @param[out] function_info + // A vector provided by the caller is filled out. May be empty if no + // FDEs/no eh_frame + // is present in this Module. + + void + GetFunctionAddressAndSizeVector(FunctionAddressAndSizeVector &function_info); + + void ForEachFDEEntries( + const std::function<bool(lldb::addr_t, uint32_t, dw_offset_t)> &callback); private: - enum - { - CFI_AUG_MAX_SIZE = 8, - CFI_HEADER_SIZE = 8 - }; - - struct CIE - { - dw_offset_t cie_offset; - uint8_t version; - char augmentation[CFI_AUG_MAX_SIZE]; // This is typically empty or very short. - uint32_t code_align; - int32_t data_align; - uint32_t return_addr_reg_num; - dw_offset_t inst_offset; // offset of CIE instructions in mCFIData - uint32_t inst_length; // length of CIE instructions in mCFIData - uint8_t ptr_encoding; - uint8_t lsda_addr_encoding; // The encoding of the LSDA address in the FDE augmentation data - lldb::addr_t personality_loc; // (file) address of the pointer to the personality routine - lldb_private::UnwindPlan::Row initial_row; - - CIE(dw_offset_t offset) : cie_offset(offset), version (-1), code_align (0), - data_align (0), return_addr_reg_num (LLDB_INVALID_REGNUM), inst_offset (0), - inst_length (0), ptr_encoding (0), - lsda_addr_encoding (DW_EH_PE_omit), personality_loc (LLDB_INVALID_ADDRESS), - initial_row () - { - } - }; - - typedef std::shared_ptr<CIE> CIESP; - - typedef std::map<dw_offset_t, CIESP> cie_map_t; - - // Start address (file address), size, offset of FDE location - // used for finding an FDE for a given File address; the start address field is - // an offset into an individual Module. - typedef RangeDataVector<lldb::addr_t, uint32_t, dw_offset_t> FDEEntryMap; - - bool - IsEHFrame() const; - - bool - GetFDEEntryByFileAddress (lldb::addr_t file_offset, FDEEntryMap::Entry& fde_entry); - - void - GetFDEIndex (); - - bool - FDEToUnwindPlan (uint32_t offset, Address startaddr, UnwindPlan& unwind_plan); - - const CIE* - GetCIE(dw_offset_t cie_offset); - - void - GetCFIData(); - - // Applies the specified DWARF opcode to the given row. This function handle the commands - // operates only on a single row (these are the ones what can appear both in CIE and in FDE). - // Returns true if the opcode is handled and false otherwise. - bool - HandleCommonDwarfOpcode(uint8_t primary_opcode, - uint8_t extended_opcode, - int32_t data_align, - lldb::offset_t& offset, - UnwindPlan::Row& row); - - ObjectFile& m_objfile; - lldb::SectionSP m_section_sp; - lldb::RegisterKind m_reg_kind; - Flags m_flags; - cie_map_t m_cie_map; - - DataExtractor m_cfi_data; - bool m_cfi_data_initialized; // only copy the section into the DE once - - FDEEntryMap m_fde_index; - bool m_fde_index_initialized; // only scan the section for FDEs once - std::mutex m_fde_index_mutex; // and isolate the thread that does it - - bool m_is_eh_frame; - - CIESP - ParseCIE (const uint32_t cie_offset); - + enum { CFI_AUG_MAX_SIZE = 8, CFI_HEADER_SIZE = 8 }; + + struct CIE { + dw_offset_t cie_offset; + uint8_t version; + char augmentation[CFI_AUG_MAX_SIZE]; // This is typically empty or very + // short. + uint32_t code_align; + int32_t data_align; + uint32_t return_addr_reg_num; + dw_offset_t inst_offset; // offset of CIE instructions in mCFIData + uint32_t inst_length; // length of CIE instructions in mCFIData + uint8_t ptr_encoding; + uint8_t lsda_addr_encoding; // The encoding of the LSDA address in the FDE + // augmentation data + lldb::addr_t personality_loc; // (file) address of the pointer to the + // personality routine + lldb_private::UnwindPlan::Row initial_row; + + CIE(dw_offset_t offset) + : cie_offset(offset), version(-1), code_align(0), data_align(0), + return_addr_reg_num(LLDB_INVALID_REGNUM), inst_offset(0), + inst_length(0), ptr_encoding(0), lsda_addr_encoding(DW_EH_PE_omit), + personality_loc(LLDB_INVALID_ADDRESS), initial_row() {} + }; + + typedef std::shared_ptr<CIE> CIESP; + + typedef std::map<dw_offset_t, CIESP> cie_map_t; + + // Start address (file address), size, offset of FDE location + // used for finding an FDE for a given File address; the start address field + // is + // an offset into an individual Module. + typedef RangeDataVector<lldb::addr_t, uint32_t, dw_offset_t> FDEEntryMap; + + bool IsEHFrame() const; + + bool GetFDEEntryByFileAddress(lldb::addr_t file_offset, + FDEEntryMap::Entry &fde_entry); + + void GetFDEIndex(); + + bool FDEToUnwindPlan(uint32_t offset, Address startaddr, + UnwindPlan &unwind_plan); + + const CIE *GetCIE(dw_offset_t cie_offset); + + void GetCFIData(); + + // Applies the specified DWARF opcode to the given row. This function handle + // the commands + // operates only on a single row (these are the ones what can appear both in + // CIE and in FDE). + // Returns true if the opcode is handled and false otherwise. + bool HandleCommonDwarfOpcode(uint8_t primary_opcode, uint8_t extended_opcode, + int32_t data_align, lldb::offset_t &offset, + UnwindPlan::Row &row); + + ObjectFile &m_objfile; + lldb::SectionSP m_section_sp; + lldb::RegisterKind m_reg_kind; + Flags m_flags; + cie_map_t m_cie_map; + + DataExtractor m_cfi_data; + bool m_cfi_data_initialized; // only copy the section into the DE once + + FDEEntryMap m_fde_index; + bool m_fde_index_initialized; // only scan the section for FDEs once + std::mutex m_fde_index_mutex; // and isolate the thread that does it + + bool m_is_eh_frame; + + CIESP + ParseCIE(const uint32_t cie_offset); }; } // namespace lldb_private -#endif // liblldb_DWARFCallFrameInfo_h_ +#endif // liblldb_DWARFCallFrameInfo_h_ |