dwarf_add_line_entry(3) [freebsd man page]

DWARF_ADD_LINE_ENTRY(3) 				   BSD Library Functions Manual 				   DWARF_ADD_LINE_ENTRY(3)

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 break-
     point 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 instruc-
     tion 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.

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.

EXAMPLE

     To add line number information to the producer instance, use:

	   Dwarf_P_Debug dbg;
	   Dwarf_Error de;
	   Dwarf_Unsigned dir, filendx;

	   /* ... assume dbg refers to a DWARF producer instance ... */

	   dir = dwarf_add_directory_decl(dbg, "/home/foo", &de);
	   if (dir == DW_DLV_NOCOUNT)
		   errx(EXIT_FAILURE, "dwarf_add_directory_decl failed: %s",
		       dwarf_errmsg(-1));

	   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));

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)

BSD
								   June 30, 2013							       BSD

Check Out this Related Man Page

DWARF_NEW_EXPR(3)					   BSD Library Functions Manual 					 DWARF_NEW_EXPR(3)

NAME

     dwarf_new_expr -- create a location expression descriptor

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     Dwarf_P_Expr
     dwarf_new_expr(Dwarf_P_Debug dbg, Dwarf_Error *err);

DESCRIPTION

     Function dwarf_new_expr() allocates a DWARF location expression descriptor used to build up a location expression stream.

     The application can use the functions dwarf_add_expr_gen(3) and dwarf_add_expr_addr_b(3) to add location expression operators to the created
     descriptor.  When done, the application can call the function dwarf_expr_into_block(3) to retrieve the generated byte stream for the location
     expression, or call the function dwarf_add_AT_location_expr(3) to create an attribute with the location expression stream as its value.

     Argument dbg should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3).

     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_new_expr() returns the created location expression descriptor.	In case of an error, function dwarf_new_expr()
     returns DW_DLV_BADADDR and sets the argument err.

ERRORS

     Function dwarf_new_expr() can fail with:

     [DW_DLE_ARGUMENT]	Argument dbg was NULL.

     [DW_DLE_MEMORY]	An out of memory condition was encountered during the execution of the function.

EXAMPLES

     To create a location expression descriptor, add location expression operators to it and to retrieve the generated byte stream, use:

	   Dwarf_P_Debug dbg;
	   Dwarf_Error de;
	   Dwarf_P_Expr pe;
	   Dwarf_Addr buf;
	   Dwarf_Unsigned len;

	   /* ...Assume that `dbg' refers to a DWARF producer instance... */

	   if ((pe = dwarf_new_expr(dbg, &de)) == DW_DLV_BADADDR) {
		   warnx("dwarf_new_expr failed: %s", dwarf_errmsg(-1));
		   return;
	   }

	   if (dwarf_add_expr_gen(pe, DW_OP_regx, 55, 0, &de) ==
	       DW_DLV_NOCOUNT) {
		   warnx("dwarf_add_expr_gen failed: %s", dwarf_errmsg(-1));
		   return;
	   }

	   if ((buf = dwarf_expr_into_block(pe, &len, &de)) ==
	       DW_DLV_BADADDR) {
		   warnx("dwarf_expr_into_block failed: %s",
		       dwarf_errmsg(-1));
		   return;
	   }

SEE ALSO

     dwarf(3), dwarf_add_AT_location_expr(3), dwarf_add_expr_gen(3), dwarf_add_expr_addr(3), dwarf_add_expr_addr_b(3),
     dwarf_expr_current_offset(3), dwarf_expr_into_block(3), dwarf_producer_init(3), dwarf_producer_init_b(3)

BSD
								 September 8, 2011							       BSD

Linux and UNIX Man Pages

dwarf_add_line_entry(3) [freebsd man page]

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