expr myString = @"Foo"
(lldb) help expr
Evaluate a C/ObjC/C++ expression in the current
program context, using variables currently in scope. This command
takes ‘raw’ input (no need to quote stuff).Syntax: expression —
Command Options Usage: expression [-f ] [-G ]
[-d ] [-u ] — expression [-o] [-d
] [-u ] — expression-G <gdb-format> ( --gdb-format <gdb-format> ) Specify a format using a GDB format specifier string. -d <boolean> ( --dynamic-value <boolean> ) Upcast the value resulting from the expression to its dynamic type if available. -f <format> ( --format <format> ) Specify a format to be used for display. -o ( --object-description ) Print the object description of the value resulting from the expression. -u <boolean> ( --unwind-on-error <boolean> ) Clean up program state if the expression causes a crash, breakpoint hit or signal.
Examples:
expr my_struct->a = my_array[3]
expr -f bin — (index * 8) + 5
expr char c[] = “foo”; c[0]IMPORTANT NOTE: Because this command takes ‘raw’ input, if you use any command options you must use ‘ — ‘ between the end of the
command options and the beginning of the raw input.‘expr’ is an abbreviation for ‘expression’