Question

I’m trying to create a LLDB alias that evaluates an expression using the argument (%1) to the alias. I’ve tried many, many different syntax combinations, but it seems like anything that uses %1 in an expression fails to parse.

(lldb) version
LLDB-112.1

This works as expected:

(lldb) expr (char*) strdup(argv[1])
(char *) $23 = 0x000000010061c090 "--calc"

When I create an alias containing %1 the example fails.

(lldb) command alias dup expr (char*) strdup(%1)
(lldb) dup argv[1]
error: expected expression
error: 1 errors parsing expression

How can I create a LLDB alias that evaluates its argument using expression?

Answer 1

To make arguments in expression work, use command regex instead of alias, like this:

command regex dup 's/(.+)/expr (char*) strdup(%1)/'

For more details, see this answer.