Data::Dump::Trace - Online Linux Manual PageSection : 3
Updated : 2022-01-21
Source : perl v5.34.0
Note : User Contributed Perl Documentation
NAMEData::Dump::Trace − Helpers to trace function and method calls
SYNOPSIS​ use Data::Dump::Trace qw(autowrap mcall); ​ ​ autowrap("LWP::UserAgent" => "ua", "HTTP::Response" => "res"); ​ ​ use LWP::UserAgent; ​ $ua = mcall(LWP::UserAgent => "new"); # instead of LWP::UserAgent−>new; ​ $ua−>get("http://www.example.com")−>dump;
DESCRIPTIONThe following functions are provided: autowrap( $class ) autowrap( $class => $prefix ) autowrap( $class1 => $prefix1, $class2 => $prefix2, ... ) autowrap( $class1 => \%info1, $class2 => \%info2, ... ) Register classes whose objects are automatically wrapped when returned by one of the call functions below. If $prefix is provided it will be used as to name the objects. Alternative is to pass an %info hash for each class. The recognized keys are: prefix => $string The prefix string used to name objects of this type. proto => \%hash A hash of prototypes to use for the methods when an object is wrapped. wrap( name => $str, func => \&func, proto => $proto ) wrap( name => $str, obj => $obj, proto => \%hash ) Returns a wrapped function or object. When a wrapped function is invoked then a trace is printed after the underlying function has returned. When a method on a wrapped object is invoked then a trace is printed after the methods on the underlying objects has returned. See ‟Prototypes” for description of the proto argument. call( $name, \&func, $proto, @ARGS ) Calls the given function with the given arguments. The trace will use ​$name as the name of the function. See ‟Prototypes” for description of the $proto argument. mcall( $class, $method, $proto, @ARGS ) mcall( $object, $method, $proto, @ARGS ) Calls the given method with the given arguments. See ‟Prototypes” for description of the $proto argument. trace( $symbol, $prototype ) Replaces the function given by $symbol with a wrapped function.
Prototypes​Note: The prototype string syntax described here is experimental and likely to change in revisions of this interface. The $proto argument to call() and mcall() can optionally provide a prototype for the function call. This give the tracer hints about how to best format the argument lists and if there are in/out or out arguments. The general form for the prototype string is: ​ <arguments> = <return_value> The default prototype is ‟@ = @”; list of values as input and list of values as output. The value '%' can be used for both arguments and return value to say that key/value pair style lists are used. Alternatively, individual positional arguments can be listed each represented by a letter: i input argument o output argument O both input and output argument If the return value prototype has ! appended, then it signals that this function sets errno ($!) when it returns a false value. The trace will display the current value of errno in that case. If the return value prototype looks like a variable name (with $ prefix), and the function returns a blessed object, then the variable name will be used as prefix and the returned object automatically traced.
SEE ALSOData::Dump 0
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