Add detailed specs for the effect on backtraces of always-inlined core methods

Author: eregon

spec/truffle/always_inlined_spec.rb

@@ -0,0 +1,79 @@
+# Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved. This
+# code is released under a tri EPL/GPL/LGPL license. You can use it,
+# redistribute it and/or modify it under the terms of the:
+#
+# Eclipse Public License version 2.0, or
+# GNU General Public License version 2, or
+# GNU Lesser General Public License version 2.1.
+
+require_relative '../ruby/spec_helper'
+
+# This spec can also run on CRuby, for comparison
+describe "Always-inlined core methods" do
+  describe "are part of the backtrace if the error happens inside that core method" do
+    it "for #public_send" do
+      -> {
+        public_send()
+      }.should raise_error(ArgumentError) { |e| e.backtrace_locations[0].label.should == 'public_send' }
+      -> {
+        public_send(Object.new)
+      }.should raise_error(TypeError) { |e| e.backtrace_locations[0].label.should == 'public_send' }
+    end
+
+    guard -> { RUBY_ENGINE != "ruby" } do
+      it "for #send" do
+        -> {
+          send()
+        }.should raise_error(ArgumentError) { |e| e.backtrace_locations[0].label.should == '__send__' }
+        -> {
+          send(Object.new)
+        }.should raise_error(TypeError) { |e| e.backtrace_locations[0].label.should == '__send__' }
+      end
+
+      it "for #__send__" do
+        -> {
+          __send__()
+        }.should raise_error(ArgumentError) { |e| e.backtrace_locations[0].label.should == '__send__' }
+        -> {
+          __send__(Object.new)
+        }.should raise_error(TypeError) { |e| e.backtrace_locations[0].label.should == '__send__' }
+      end
+    end
+  end
+
+  describe "are not part of the backtrace if the error happens in a different method" do
+    it "for #public_send" do
+      -> {
+        public_send(:yield_self) { raise "foo" }
+      }.should raise_error(RuntimeError, "foo") { |e|
+        e.backtrace_locations[0].label.should.start_with?('block (5 levels)')
+        e.backtrace_locations[1].label.should == 'yield_self'
+        if RUBY_ENGINE == 'ruby'
+          e.backtrace_locations[2].label.should == 'public_send'
+        else
+          e.backtrace_locations[2].label.should.start_with?('block (4 levels)')
+        end
+      }
+    end
+
+    it "for #send" do
+      -> {
+        send(:yield_self) { raise "foo" }
+      }.should raise_error(RuntimeError, "foo") { |e|
+        e.backtrace_locations[0].label.should.start_with?('block (5 levels)')
+        e.backtrace_locations[1].label.should == 'yield_self'
+        e.backtrace_locations[2].label.should.start_with?('block (4 levels)')
+      }
+    end
+
+    it "for #__send__" do
+      -> {
+        __send__(:yield_self) { raise "foo" }
+      }.should raise_error(RuntimeError, "foo") { |e|
+        e.backtrace_locations[0].label.should.start_with?('block (5 levels)')
+        e.backtrace_locations[1].label.should == 'yield_self'
+        e.backtrace_locations[2].label.should.start_with?('block (4 levels)')
+      }
+    end
+  end
+end