Python code can request and inspect line table information from a
symbol table that is loaded in gdb. A line table is a
mapping of source lines to their executable locations in memory. To
acquire the line table information for a particular symbol table, use
the linetable function (see Symbol Tables In Python).
A gdb.LineTable is iterable. The iterator returns
LineTableEntry objects that correspond to the source line and
address for each line table entry. LineTableEntry objects have
the following attributes:
The source line number for this line table entry. This number corresponds to the actual line of source. This attribute is not writable.
The address that is associated with the line table entry where the executable code for that source line resides in memory. This attribute is not writable.
As there can be multiple addresses for a single source line, you may
receive multiple LineTableEntry objects with matching
line attributes, but with different pc attributes. The
iterator is sorted in ascending pc order. Here is a small
example illustrating iterating over a line table.
symtab = gdb.selected_frame().find_sal().symtab
linetable = symtab.linetable()
for line in linetable:
print "Line: "+str(line.line)+" Address: "+hex(line.pc)
This will have the following output:
Line: 33 Address: 0x4005c8L
Line: 37 Address: 0x4005caL
Line: 39 Address: 0x4005d2L
Line: 40 Address: 0x4005f8L
Line: 42 Address: 0x4005ffL
Line: 44 Address: 0x400608L
Line: 42 Address: 0x40060cL
Line: 45 Address: 0x400615L
In addition to being able to iterate over a LineTable, it also
has the following direct access methods:
Return a Python
TupleofLineTableEntryobjects for any entries in the line table for the given line, which specifies the source code line. If there are no entries for that source code line, the PythonNoneis returned.