Crate call_trace

Example

use call_trace::{trace_with, CallContext, Trace};

struct My;

impl My {
    #[inline]
    #[trace_with(self)]
    /// test
    fn foo(&mut self) {
        self.bar();
    }

    #[trace_with(self)]
    fn bar(&mut self) {
        let x = self.baz();
        let y = self.baz();
        println!("x + y = {}", x + y);
    }

    #[trace_with(self)]
    fn baz(&mut self) -> i32 {
        15
    }
}

impl Trace for My {
    fn on_pre(&mut self, ctx: &CallContext) {
        println!("> {:?}", ctx);
    }
    fn on_post(&mut self, ctx: &CallContext) {
        println!("< {:?}", ctx);
    }
}

fn main() {
    My.foo();
}

Output

> CallContext { file: "main.rs", line: 13, fn_name: "bar" }
> CallContext { file: "main.rs", line: 20, fn_name: "baz" }
< CallContext { file: "main.rs", line: 20, fn_name: "baz" }
> CallContext { file: "main.rs", line: 20, fn_name: "baz" }
< CallContext { file: "main.rs", line: 20, fn_name: "baz" }
x + y = 30
< CallContext { file: "main.rs", line: 13, fn_name: "bar" }
< CallContext { file: "main.rs", line: 7, fn_name: "foo" }

Structs

• CallContext
  Contains information about the current call site.

Traits

• Trace
  Tracing interface invoked by #[trace] and #[trace_with]

Attribute Macros

• trace_with
  The #[trace_with] macro. Needs to be applied to function definitions, and will invoke hte Trace interface on the user-provided expression.