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download PDF document: dwarf_add_line_entry.3.pdf

DWARF_ADD_LINE_ENTRY(3) FreeBSD Library Functions Manual
NAME dwarf_add_line_entry - add a line number information entry to a producer instance
LIBRARY DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS #include <libdwarf.h>
Dwarf_Unsigned dwarf_add_line_entry(Dwarf_P_Debug dbg, Dwarf_Unsigned filendx, Dwarf_Addr off, Dwarf_Unsigned lineno, Dwarf_Signed column, Dwarf_Bool is_stmt, Dwarf_Bool basic_block, Dwarf_Error *err);
DESCRIPTION Function dwarf_add_line_entry() adds a line number information entry to a DWARF producer instance.
Argument dbg should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3).
Argument filendx specifies the index of the source file that contains the source line in question. Valid source file indices are those returned by the function dwarf_add_file_decl(3).
Argument off specifies a relocatable program address. The ELF symbol to be used for relocation is set by a prior call to the function dwarf_lne_set_address(3).
Argument lineno specifies the line number of the source line.
Argument column specifies the column number within the source line.
If the argument is_stmt is set to true, it indicates that the instruction at the address specified by argument off is a recommended breakpoint location, i.e., the first instruction in the instruction sequence generated by the source line.
If the argument basic_block is set to true, it indicates that the instruction at the address specified by argument off is the first instruction of a basic block.
If argument err is not NULL, it will be used to store error information in case of an error.
RETURN VALUES On success, function dwarf_add_line_entry() returns DW_DLV_OK. In case of an error, function dwarf_add_line_entry() returns DW_DLV_NOCOUNT and sets the argument err.
EXAMPLES To add line number information to the producer instance, use:
Dwarf_P_Debug dbg; Dwarf_Error de; Dwarf_Unsigned dir, filendx;
filendx = dwarf_add_file_decl(dbg, "bar.c", dir, 0, 1234, &de); if (filendx == DW_DLV_NOCOUNT) errx(EXIT_FAILURE, "dwarf_add_file_decl failed: %s", dwarf_errmsg(-1));
if (dwarf_lne_set_address(dbg, 0x4012b0, 12, &de) != DW_DLV_OK) errx(EXIT_FAILURE, "dwarf_lne_set_address failed: %s", dwarf_errmsg(-1));
if (dwarf_add_line_entry(dbg, filendx, 10, 258, 0, 1, 1, &de) != DW_DLV_OK) errx(EXIT_FAILURE, "dwarf_add_line_entry failed: %s", dwarf_errmsg(-1));
ERRORS Function dwarf_add_line_entry() can fail with:
[DW_DLE_ARGUMENT] Argument dbg was NULL.
[DW_DLE_ARGUMENT] The function dwarf_lne_set_address(3) was not called before calling this function.
[DW_DLE_MEMORY] An out of memory condition was encountered during the execution of the function.
SEE ALSO dwarf(3), dwarf_add_directory_decl(3), dwarf_add_file_decl(3), dwarf_lne_end_sequence(3), dwarf_lne_set_address(3), dwarf_producer_init(3), dwarf_producer_init_b(3)
FreeBSD 14.0-RELEASE-p6 June 30, 2013 FreeBSD 14.0-RELEASE-p6