diff options
Diffstat (limited to 'lib/runtime_tools/doc/src/dbg.xml')
| -rw-r--r-- | lib/runtime_tools/doc/src/dbg.xml | 23 |
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> +(<0.32.0>) call lists:sort([2,1]) ({erl_eval,do_apply,5}) +(<0.32.0>) returned from lists:sort/1 -> [1,2] +[1,2]</pre> </desc> </func> <func> |