gotrace annotates function calls in go source files with log statements on entry and exit.
usage: gotrace [flags] [path ...]
-exclude string
exclude any matching functions, takes precedence over filter
-exported
only annotate exported functions
-filter string
only annotate functions matching the regular expression (default ".")
-formatLength int
limit the formatted length of each argument to 'size' (default 1024)
-package
show package name prefix on function calls
-prefix string
log prefix (default "\t")
-returns
show function return
-timing
print function durations. Implies -returns
-w re-write files in place