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authorBjörn Gustavsson <[email protected]>2017-11-16 06:10:12 +0100
committerBjörn Gustavsson <[email protected]>2017-11-30 12:46:51 +0100
commit01f96ee6197a7b5a2c64353a3b38260994ce5ad5 (patch)
tree97f5feee2f1277d83d9287dd922b03104307c7c4 /erts/doc/src
parent38e4dfbd281cae0fb58211b63861b037ad121231 (diff)
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Add documentation for the new stacktrace syntax
Diffstat (limited to 'erts/doc/src')
-rw-r--r--erts/doc/src/erlang.xml45
1 files changed, 16 insertions, 29 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index daf3002ec7..d7404fa3ce 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -1985,39 +1985,26 @@ true</pre>
<fsummary>Get the call stack back-trace of the last exception.</fsummary>
<type name="stack_item"/>
<desc>
- <p>Gets the call stack back-trace (<em>stacktrace</em>) for an
- exception that has just been caught
- in the calling process as a list of
- <c>{<anno>Module</anno>,<anno>Function</anno>,<anno>Arity</anno>,<anno>Location</anno>}</c>
- tuples. Field <c><anno>Arity</anno></c> in the first tuple can be the
- argument list of that function call instead of an arity integer,
- depending on the exception.</p>
- <p>If there has not been any exceptions in a process, the
- stacktrace is <c>[]</c>. After a code change for the process,
- the stacktrace can also be reset to <c>[]</c>.</p>
- <p><c>erlang:get_stacktrace/0</c> is only guaranteed to return
- a stacktrace if called (directly or indirectly) from within the
- scope of a <c>try</c> expression. That is, the following call works:</p>
+ <warning><p><c>erlang:get_stacktrace/0</c> is deprecated and will stop working
+ in a future release.</p></warning>
+ <p>Instead of using <c>erlang:get_stacktrace/0</c> to retrieve
+ the call stack back-trace, use the following syntax:</p>
<pre>
try Expr
catch
- C:R ->
- {C,R,erlang:get_stacktrace()}
+ Class:Reason:Stacktrace ->
+ {Class,Reason,Stacktrace}
end</pre>
- <p>As does this call:</p>
-<pre>
-try Expr
-catch
- C:R ->
- {C,R,helper()}
-end
-
-helper() ->
- erlang:get_stacktrace().</pre>
-
- <warning><p>In a future release,
- <c>erlang:get_stacktrace/0</c> will return <c>[]</c> if called
- from outside a <c>try</c> expression.</p></warning>
+ <p><c>erlang:get_stacktrace/0</c> retrieves the call stack back-trace
+ (<em>stacktrace</em>) for an exception that has just been
+ caught in the calling process as a list of
+ <c>{<anno>Module</anno>,<anno>Function</anno>,<anno>Arity</anno>,<anno>Location</anno>}</c>
+ tuples. Field <c><anno>Arity</anno></c> in the first tuple can
+ be the argument list of that function call instead of an arity
+ integer, depending on the exception.</p>
+ <p>If there has not been any exceptions in a process, the
+ stacktrace is <c>[]</c>. After a code change for the process,
+ the stacktrace can also be reset to <c>[]</c>.</p>
<p>The stacktrace is the same data as operator <c>catch</c>
returns, for example:</p>
<pre>