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[ji] support java.lang.Throwable#backtrace_locations by kares · Pull Request #9461 · jruby/jruby · GitHub

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[ji] support java.lang.Throwable#backtrace_locations #9461

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Merged
kares merged 1 commit into from
May 27, 2026
Conversation 6 Commits 1 Checks 113 Files changed
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[ji] support java.lang.Throwable#backtrace_locations #9461

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3 changes: 2 additions & 1 deletion core/src/main/java/org/jruby/RubyThread.java
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Original file line number Diff line number Diff line change
Expand Up @@ -567,9 +567,10 @@ public static RubyArray newLocationArray(Ruby runtime, RubyStackTraceElement[] e
public static RubyArray newLocationArray(Ruby runtime, RubyStackTraceElement[] elements,
final int offset, final int length) {

final RubyClass locationClass = runtime.getLocation();
IRubyObject[] ary = new IRubyObject[length];
for ( int i = 0; i < length; i++ ) {
ary[i] = newLocation(runtime, elements[i + offset]);
ary[i] = new Location(runtime, locationClass, elements[i + offset]);

headius May 26, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Would a new overload of newLocation make sense here?

kares May 27, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

not sure, literally would be the same as doing new Location() directly.
}

return RubyArray.newArrayNoCopy(runtime, ary);
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18 changes: 16 additions & 2 deletions core/src/main/java/org/jruby/javasupport/ext/JavaLang.java
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Expand Up @@ -44,6 +44,7 @@
import org.jruby.runtime.JavaInternalBlockBody;
import org.jruby.runtime.Signature;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.backtrace.RubyStackTraceElement;
import org.jruby.runtime.backtrace.TraceType;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.RubyStringBuilder;
Expand Down Expand Up @@ -223,9 +224,8 @@ public static class Throwable {
public static IRubyObject backtrace(final ThreadContext context, final IRubyObject self) {
final Ruby runtime = context.runtime;
java.lang.Throwable throwable = unwrapIfJavaObject(self);
// TODO instead this should get aligned with NativeException !?!
StackTraceElement[] stackTrace = throwable.getStackTrace();
if ( stackTrace == null ) return context.nil; // never actually happens
if ( stackTrace == null ) return context.nil;
final int len = stackTrace.length;
if ( len == 0 ) return RubyArray.newEmptyArray(runtime);
IRubyObject[] backtrace = new IRubyObject[len];
Expand All @@ -235,6 +235,20 @@ public static IRubyObject backtrace(final ThreadContext context, final IRubyObje
return RubyArray.newArrayMayCopy(runtime, backtrace);
}

@JRubyMethod
public static IRubyObject backtrace_locations(final ThreadContext context, final IRubyObject self) {

headius May 26, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

This and backtrace are very similar. Maybe share the common parts and just construct the elements differently.

kares May 27, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

yeah the preamble, but even if we dry out the loop mapping with a function you still need to return a different array.
java.lang.Throwable throwable = unwrapIfJavaObject(self);
StackTraceElement[] stackTrace = throwable.getStackTrace();
if ( stackTrace == null ) return context.nil;
final int len = stackTrace.length;
if ( len == 0 ) return RubyArray.newEmptyArray(context.runtime);
RubyStackTraceElement[] rubyStackTrace = new RubyStackTraceElement[len];
for ( int i = 0; i < len; i++ ) {
rubyStackTrace[i] = new RubyStackTraceElement(stackTrace[i]);
}
return RubyThread.Location.newLocationArray(context.runtime, rubyStackTrace);
}

@Deprecated(since = "10.0.0.0")
public static IRubyObject set_backtrace(final IRubyObject self, final IRubyObject backtrace) {
return set_backtrace(((RubyBasicObject) self).getCurrentContext(), self, backtrace);
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16 changes: 16 additions & 0 deletions test/jruby/test_backtraces.rb
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Expand Up @@ -82,6 +82,22 @@ def test_java_backtrace
assert_equal 1, ruby_trace.length # only once!
end

def test_java_backtrace_locations
org.jruby.test.TestHelper.throwTestHelperException
raise 'did no raise exception'
rescue java.lang.Exception => e
locations = e.backtrace_locations
assert_kind_of Array, locations
assert_kind_of Thread::Backtrace::Location, locations[0]

location = locations[0]
assert_equal 'org/jruby/test/TestHelper.java', location.path

assert_operator location.lineno, :>, 1
assert_equal 'throwTestHelperException', location.label
assert_match /TestHelper\.java:\d+:in .throwTestHelperException/, location.to_s
end

def test_simple_exception_recursive
@offset = __LINE__
def meth(n)
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