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<!DOCTYPE html>
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<h1 class="main">Debugger</h1>
<p>To use the native <em>V debugger</em>, add the <code>$dbg</code> statement to your source, where you
want the debugger to be invoked.</p>
<div class="language-v">fn main() {
a := 1
$dbg;
}
</div>
<p>Running this V code, you will get the debugger REPL break when the execution
reaches the <code>$dbg</code> statement.</p>
<pre><code>$ v run example.v
Break on [main] main in example.v:3
example.v:3 vdbg>
</code></pre>
<p>At this point, execution is halted, and the debugger is now available.</p>
<p>To see the available commands, type
?, h or help. (Completion for commands works - Non-Windows only)</p>
<pre><code>example.v:3 vdbg> ?
vdbg commands:
anon? check if the current context is anon
bt prints a backtrace
c, continue continue debugging
generic? check if the current context is generic
heap show heap memory usage
h, help, ? show this help
l, list [lines] show some lines from current break (default: 3)
mem, memory show memory usage
method? check if the current context is a method
m, mod show current module name
p, print <var> prints an variable
q, quit exits debugging session in the code
scope show the vars in the current scope
u, unwatch <var> unwatches a variable
w, watch <var> watches a variable
</code></pre>
<p>Lets try the <code>scope</code> command, to inspect the current scope context.</p>
<pre><code>example.v:3 vdbg> scope
a = 1 (int)
</code></pre>
<p>Cool! We have the variable name, its value and its type name.</p>
<p>What about printing only a variable, not the whole scope?</p>
<p>Just type <code>p a</code>.</p>
<p>To watch a variable by its name, use:</p>
<p><code>w a</code> (where <code>a</code> is the variable name)</p>
<p>To stop watching the variable (<code>unwatch</code> it), use <code>u a</code>.</p>
<p>Lets see more one example:</p>
<pre><code>fn main() {
for i := 0; i < 4; i++ {
$dbg
}
}
</code></pre>
<p>Running again, we'll get:
<code>Break on [main] main in example.v:3</code></p>
<p>If we want to read the source code context, we can use the <code>l</code> or <code>list</code> command.</p>