------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . D W A R F _ L I N E S -- -- -- -- S p e c -- -- -- -- Copyright (C) 2009-2022, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This package provides routines to read DWARF line number information from -- a binary file with as little overhead as possible. This allows conversions -- from PC addresses to human-readable source locations. -- -- Files must be compiled with at least minimal debugging information (-g1). with System.Bounded_Strings; with System.Object_Reader; with System.Traceback_Entries; package System.Dwarf_Lines is package STE renames System.Traceback_Entries; package SOR renames System.Object_Reader; type Dwarf_Context (In_Exception : Boolean := False) is private; -- Type encapsulating the state of the DWARF reader. When In_Exception is -- True, we are parsing as part of an exception handler decorator so we do -- not want another exception to be raised and the parsing is done safely, -- skipping binary files that cannot be read or have been stripped from -- their debug sections for example. procedure Open (File_Name : String; C : out Dwarf_Context; Success : out Boolean); procedure Close (C : in out Dwarf_Context); -- Open and close a file procedure Set_Load_Address (C : in out Dwarf_Context; Addr : Address); -- Set the run-time load address of a file. Used to rebase PIE (Position -- Independent Executable) binaries. function Is_Inside (C : Dwarf_Context; Addr : Address) return Boolean; pragma Inline (Is_Inside); -- Return whether a run-time address Addr lies within the file function Low_Address (C : Dwarf_Context) return Address; pragma Inline (Low_Address); -- Return the lowest run-time address of the file procedure Dump (C : in out Dwarf_Context); -- Dump each row found in the object's .debug_lines section to standard out procedure Dump_Cache (C : Dwarf_Context); -- Dump the cache (if present) procedure Enable_Cache (C : in out Dwarf_Context); -- Read symbol information to speed up Symbolic_Traceback. procedure Symbolic_Traceback (Cin : Dwarf_Context; Traceback : STE.Tracebacks_Array; Suppress_Hex : Boolean; Symbol_Found : out Boolean; Res : in out System.Bounded_Strings.Bounded_String); -- Generate a string for a traceback suitable for displaying to the user. -- If one or more symbols are found, Symbol_Found is set to True. This -- allows the caller to fall back to hexadecimal addresses. Dwarf_Error : exception; -- Raised if a problem is encountered parsing DWARF information. Can be a -- result of a logic error or malformed DWARF information. private -- The following section numbers reference -- "DWARF Debugging Information Format, Version 5" -- published by the Standards Group, http://freestandards.org. -- 6.2.2 State Machine Registers type Line_Info_Registers is record Address : SOR.uint64; File : SOR.uint32; Line : SOR.uint32; Column : SOR.uint32; Is_Stmt : Boolean; Basic_Block : Boolean; End_Sequence : Boolean; -- Prologue_End : Boolean; -- Epilogue_Begin : Boolean; -- ISA : SOR.uint32; -- Discriminator : SOR.uint32; -- DWARF 4/5 Is_Row : Boolean; -- local end record; -- 6.2.4 The Line Number Program Header MAX_OPCODE : constant := 256; type Opcode_Length_Array is array (1 .. MAX_OPCODE) of SOR.uint8; MAX_ENTRY : constant := 5; type Entry_Format_Pair is record C_Type : SOR.uint32; Form : SOR.uint32; end record; type Entry_Format_Array is array (1 .. MAX_ENTRY) of Entry_Format_Pair; type Line_Info_Header is record Unit_Length : SOR.Offset; Version : SOR.uint16; Address_Size : SOR.uint8; -- DWARF 5 Segment_Selector_Size : SOR.uint8; -- DWARF 5 Header_Length : SOR.uint32; Minimum_Insn_Length : SOR.uint8; Maximum_Op_Per_Insn : SOR.uint8; -- DWARF 4/5 Default_Is_Stmt : SOR.uint8; Line_Base : SOR.int8; Line_Range : SOR.uint8; Opcode_Base : SOR.uint8; -- Standard_Opcode_Lengths : Opcode_Length_Array; Directory_Entry_Format_Count : SOR.uint8; -- DWARF 5 Directory_Entry_Format : Entry_Format_Array; -- DWARF 5 Directories_Count : SOR.uint32; -- DWARF 5 Directories : SOR.Offset; File_Name_Entry_Format_Count : SOR.uint8; -- DWARF 5 File_Name_Entry_Format : Entry_Format_Array; -- DWARF 5 File_Names_Count : SOR.uint32; -- DWARF 5 File_Names : SOR.Offset; Is64 : Boolean; -- local end record; type Search_Entry is record First : SOR.uint32; Size : SOR.uint32; -- Function bounds as offset to the base address. Sym : SOR.uint32; -- Symbol offset to get the name. Line : SOR.uint32; -- Dwarf line offset. end record; type Search_Array is array (Natural range <>) of Search_Entry; type Search_Array_Access is access Search_Array; type Dwarf_Context (In_Exception : Boolean := False) is record Low, High : Address; -- Address bounds for executable code Obj : SOR.Object_File_Access; -- The object file containing dwarf sections Load_Address : Address := Null_Address; -- The address at which the object file was loaded at run time Has_Debug : Boolean; -- True if all debug sections are available Cache : Search_Array_Access; -- Quick access to symbol and debug info (when present). Abbrev : SOR.Mapped_Stream; Aranges : SOR.Mapped_Stream; Info : SOR.Mapped_Stream; Lines : SOR.Mapped_Stream; Line_Str : SOR.Mapped_Stream; -- DWARF 5 -- DWARF sections Header : Line_Info_Header; Registers : Line_Info_Registers; Next_Header : SOR.Offset; -- State for lines end record; end System.Dwarf_Lines;