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-rw-r--r--lib/runtime_tools/doc/src/dbg.xml23
1 files changed, 20 insertions, 3 deletions
diff --git a/lib/runtime_tools/doc/src/dbg.xml b/lib/runtime_tools/doc/src/dbg.xml
index f26789fa21..c7c5cd4ff0 100644
--- a/lib/runtime_tools/doc/src/dbg.xml
+++ b/lib/runtime_tools/doc/src/dbg.xml
@@ -316,7 +316,8 @@ Error: fun containing local erlang function calls ('is_atomm' called in guard) c
<v>Module = atom() | '_'</v>
<v>Function = atom() | '_'</v>
<v>Arity = integer() |'_'</v>
- <v>MatchSpec = integer() | atom() | [] | match_spec()</v>
+ <v>MatchSpec = integer() | Built-inAlias | [] | match_spec()</v>
+ <v>Built-inAlias = x | c | cx</v>
<v>MatchDesc = [MatchInfo]</v>
<v>MatchInfo = {saved, integer()} | MatchNum</v>
<v>MatchNum = {matched, node(), integer()} | {matched, node(), 0, RPCError}</v>
@@ -349,8 +350,9 @@ Error: fun containing local erlang function calls ('is_atomm' called in guard) c
if the MatchSpec is other
than []. The integer <c>N</c> may then be used in
subsequent calls to this function and will stand as an
- "alias" for the given expression. There are also built-in
- aliases named with atoms (see also <c>ltp/0</c> below).</p>
+ "alias" for the given expression. There are also a couple of
+ built-in aliases for common expressions, see <c>ltp/0</c> below
+ for details.</p>
<p>If an error is returned, it can be due to errors in
compilation of the match specification. Such errors are
presented as a list of tuples <c>{error, string()}</c> where
@@ -528,6 +530,21 @@ Error: fun containing local erlang function calls ('is_atomm' called in guard) c
<p>Match specifications used can be saved in a file (if a
read-write file system is present) for use in later
debugging sessions, see <c>wtp/1</c> and <c>rtp/1</c></p>
+ <p>There are three built-in trace patterns:
+ <c>exception_trace</c>, <c>caller_trace</c>
+ and <c>caller_exception_trace</c> (or <c>x</c>, <c>c</c> and
+ <c>cx</c> respectively).
+ Exception trace sets a trace which will show function names,
+ parameters, return values and exceptions thrown from functions.
+ Caller traces display function names, parameters and information
+ about which function called it. An example using a built-in alias:</p>
+ <pre>
+(x@y)4> <input>dbg:tp(lists,sort,cx).</input>
+{ok,[{matched,nonode@nohost,2},{saved,cx}]}
+(x@y)4> <input>lists:sort([2,1]).</input>
+(&lt;0.32.0&gt;) call lists:sort([2,1]) ({erl_eval,do_apply,5})
+(&lt;0.32.0&gt;) returned from lists:sort/1 -> [1,2]
+[1,2]</pre>
</desc>
</func>
<func>