aboutsummaryrefslogtreecommitdiffstats
path: root/system
diff options
context:
space:
mode:
Diffstat (limited to 'system')
-rw-r--r--system/doc/design_principles/gen_server_concepts.xml2
-rw-r--r--system/doc/efficiency_guide/advanced.xml7
-rw-r--r--system/doc/reference_manual/errors.xml47
-rw-r--r--system/doc/reference_manual/expressions.xml32
-rw-r--r--system/doc/tutorial/port_driver.c3
5 files changed, 73 insertions, 18 deletions
diff --git a/system/doc/design_principles/gen_server_concepts.xml b/system/doc/design_principles/gen_server_concepts.xml
index c1b98189d5..3a1f876646 100644
--- a/system/doc/design_principles/gen_server_concepts.xml
+++ b/system/doc/design_principles/gen_server_concepts.xml
@@ -32,7 +32,7 @@
<marker id="gen_server"></marker>
<p>This section is to be read with the
<seealso marker="stdlib:gen_server">gen_server(3)</seealso>
- manual page in <c>stdblib</c>, where all interface functions and
+ manual page in <c>stdlib</c>, where all interface functions and
callback functions are described in detail.</p>
<section>
diff --git a/system/doc/efficiency_guide/advanced.xml b/system/doc/efficiency_guide/advanced.xml
index bb4440a245..896eda5f1c 100644
--- a/system/doc/efficiency_guide/advanced.xml
+++ b/system/doc/efficiency_guide/advanced.xml
@@ -255,10 +255,11 @@
<cell><marker id="unique_references"/>Unique References on a Runtime System Instance</cell>
<cell>Each scheduler thread has its own set of references, and all
other threads have a shared set of references. Each set of references
- consist of <c>2⁶⁴ - 1</c> unique references. That is the total
+ consist of <c>2⁶⁴ - 1</c> unique references. That is, the total
amount of unique references that can be produced on a runtime
- system instance is <c>(NoSchedulers + 1) * (2⁶⁴ - 1)</c>. If a
- scheduler thread create a new reference each nano second,
+ system instance is <c>(NoSchedulers + 1) × (2⁶⁴ - 1)</c>.
+ <br/><br/>
+ If a scheduler thread create a new reference each nano second,
references will at earliest be reused after more than 584 years.
That is, for the foreseeable future they are unique enough.</cell>
</row>
diff --git a/system/doc/reference_manual/errors.xml b/system/doc/reference_manual/errors.xml
index b16c5da6eb..16d3e7590e 100644
--- a/system/doc/reference_manual/errors.xml
+++ b/system/doc/reference_manual/errors.xml
@@ -108,14 +108,55 @@
(see <seealso marker="#exit_reasons">Exit Reason</seealso>),
and a stack trace (which aids in finding the code location of
the exception).</p>
- <p>The stack trace can be retrieved using
- <c>erlang:get_stacktrace/0</c>
- from within a <c>try</c> expression, and is returned for
+ <p>The stack trace can be be bound to a variable from within
+ a <c>try</c> expression, and is returned for
exceptions of class <c>error</c> from a <c>catch</c> expression.</p>
<p>An exception of class <c>error</c> is also known as a run-time
error.</p>
+
+ <section>
+ <title>The call-stack back trace (stacktrace)</title>
+ <p>The stack back-trace (<em>stacktrace</em>) is a list of
+ <c>{Module,Function,Arity,Location}</c>
+ tuples. The field <c>Arity</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><c>Location</c> is a (possibly empty) list of two-tuples
+ that can indicate the location in the source code of the
+ function. The first element is an atom describing the type of
+ information in the second element. The following items can
+ occur:</p>
+ <taglist>
+ <tag><c>file</c></tag>
+ <item>The second element of the tuple is a string (list of
+ characters) representing the filename of the source file
+ of the function.
+ </item>
+ <tag><c>line</c></tag>
+ <item>The second element of the tuple is the line number
+ (an integer &gt; 0) in the source file
+ where the exception occurred or the function was called.
+ </item>
+ </taglist>
+ <warning><p>Developers should rely on stacktrace entries only for
+ debugging purposes.</p>
+ <p>The VM performs tail call optimization, which
+ does not add new entries to the stacktrace, and also limits stacktraces
+ to a certain depth. Furthermore, compiler options, optimizations and
+ future changes may add or remove stacktrace entries, causing any code
+ that expects the stacktrace to be in a certain order or contain specific
+ items to fail.</p>
+ <p>The only exception to this rule is the class <c>error</c> with the
+ reason <c>undef</c> which is guaranteed to include the <c>Module</c>,
+ <c>Function</c> and <c>Arity</c> of the attempted
+ function as the first stacktrace entry.</p>
+ </warning>
+ </section>
+
</section>
+
<section>
<title>Handling of Run-time Errors in Erlang</title>
diff --git a/system/doc/reference_manual/expressions.xml b/system/doc/reference_manual/expressions.xml
index cf2d5034aa..94e40dd077 100644
--- a/system/doc/reference_manual/expressions.xml
+++ b/system/doc/reference_manual/expressions.xml
@@ -1340,9 +1340,9 @@ hello</pre>
<code type="none">
try Exprs
catch
- [Class1:]ExceptionPattern1 [when ExceptionGuardSeq1] ->
+ Class1:ExceptionPattern1[:Stacktrace] [when ExceptionGuardSeq1] ->
ExceptionBody1;
- [ClassN:]ExceptionPatternN [when ExceptionGuardSeqN] ->
+ ClassN:ExceptionPatternN[:Stacktrace] [when ExceptionGuardSeqN] ->
ExceptionBodyN
end</code>
<p>This is an enhancement of
@@ -1362,10 +1362,12 @@ end</code>
the evaluation. In that case the exception is caught and
the patterns <c>ExceptionPattern</c> with the right exception
class <c>Class</c> are sequentially matched against the caught
- exception. An omitted <c>Class</c> is shorthand for <c>throw</c>.
- If a match succeeds and the optional guard sequence
+ exception. If a match succeeds and the optional guard sequence
<c>ExceptionGuardSeq</c> is true, the corresponding
<c>ExceptionBody</c> is evaluated to become the return value.</p>
+ <p><c>Stacktrace</c>, if specified, must be the name of a variable
+ (not a pattern). The stack trace is bound to the variable when
+ the corresponding <c>ExceptionPattern</c> matches.</p>
<p>If an exception occurs during evaluation of <c>Exprs</c> but
there is no matching <c>ExceptionPattern</c> of the right
<c>Class</c> with a true guard sequence, the exception is passed
@@ -1373,6 +1375,18 @@ end</code>
expression.</p>
<p>If an exception occurs during evaluation of <c>ExceptionBody</c>,
it is not caught.</p>
+ <p>It is allowed to omit <c>Class</c> and <c>Stacktrace</c>.
+ An omitted <c>Class</c> is shorthand for <c>throw</c>:</p>
+
+ <code type="none">
+try Exprs
+catch
+ ExceptionPattern1 [when ExceptionGuardSeq1] ->
+ ExceptionBody1;
+ ExceptionPatternN [when ExceptionGuardSeqN] ->
+ ExceptionBodyN
+end</code>
+
<p>The <c>try</c> expression can have an <c>of</c>
section:
</p>
@@ -1384,10 +1398,10 @@ try Exprs of
PatternN [when GuardSeqN] ->
BodyN
catch
- [Class1:]ExceptionPattern1 [when ExceptionGuardSeq1] ->
+ Class1:ExceptionPattern1[:Stacktrace] [when ExceptionGuardSeq1] ->
ExceptionBody1;
...;
- [ClassN:]ExceptionPatternN [when ExceptionGuardSeqN] ->
+ ClassN:ExceptionPatternN[:Stacktrace] [when ExceptionGuardSeqN] ->
ExceptionBodyN
end</code>
<p>If the evaluation of <c>Exprs</c> succeeds without an exception,
@@ -1408,10 +1422,10 @@ try Exprs of
PatternN [when GuardSeqN] ->
BodyN
catch
- [Class1:]ExceptionPattern1 [when ExceptionGuardSeq1] ->
+ Class1:ExceptionPattern1[:Stacktrace] [when ExceptionGuardSeq1] ->
ExceptionBody1;
...;
- [ClassN:]ExceptionPatternN [when ExceptionGuardSeqN] ->
+ ClassN:ExceptionPatternN[:Stacktrace] [when ExceptionGuardSeqN] ->
ExceptionBodyN
after
AfterBody
@@ -1470,7 +1484,7 @@ try Expr
catch
throw:Term -> Term;
exit:Reason -> {'EXIT',Reason}
- error:Reason -> {'EXIT',{Reason,erlang:get_stacktrace()}}
+ error:Reason:Stk -> {'EXIT',{Reason,Stk}}
end</code>
</section>
diff --git a/system/doc/tutorial/port_driver.c b/system/doc/tutorial/port_driver.c
index 37de67310f..8b441733ed 100644
--- a/system/doc/tutorial/port_driver.c
+++ b/system/doc/tutorial/port_driver.c
@@ -51,8 +51,7 @@ ErlDrvEntry example_driver_entry = {
queue */
NULL, /* F_PTR call, much like control, sync call
to driver */
- NULL, /* F_PTR event, called when an event selected
- by driver_event() occurs. */
+ NULL, /* unused */
ERL_DRV_EXTENDED_MARKER, /* int extended marker, Should always be
set to indicate driver versioning */
ERL_DRV_EXTENDED_MAJOR_VERSION, /* int major_version, should always be
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 22:16:22 +0000