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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

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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
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