Prefer `th->ec` for stack base/size. (#13101)

1 files changed, 53 insertions, 0 deletions

diff --git a/test/-ext-/stack/test_stack_overflow.rb b/test/-ext-/stack/test_stack_overflow.rb
new file mode 100644
index 0000000000..eadf6d292a
--- /dev/null
+++ b/test/-ext-/stack/test_stack_overflow.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+require 'test/unit'
+
+class Test_StackOverflow < Test::Unit::TestCase
+  def test_proc_overflow
+    omit("Windows stack overflow handling is missing") if RUBY_PLATFORM =~ /mswin|win32|mingw/
+
+    assert_separately([], <<~RUBY)
+      # GC may try to scan the top of the stack and cause a SEGV.
+      GC.disable
+      require '-test-/stack'
+
+      assert_raise(SystemStackError) do
+        Thread.alloca_overflow
+      end
+    RUBY
+  end
+
+  def test_thread_stack_overflow
+    omit("Windows stack overflow handling is missing") if RUBY_PLATFORM =~ /mswin|win32|mingw/
+
+    assert_separately([], <<~RUBY)
+      require '-test-/stack'
+      GC.disable
+
+      thread = Thread.new do
+        Thread.current.report_on_exception = false
+        Thread.alloca_overflow
+      end
+
+      assert_raise(SystemStackError) do
+        thread.join
+      end
+    RUBY
+  end
+
+  def test_fiber_stack_overflow
+    omit("Windows stack overflow handling is missing") if RUBY_PLATFORM =~ /mswin|win32|mingw/
+
+    assert_separately([], <<~RUBY)
+      require '-test-/stack'
+      GC.disable
+
+      fiber = Fiber.new do
+        Thread.alloca_overflow
+      end
+
+      assert_raise(SystemStackError) do
+        fiber.resume
+      end
+    RUBY
+  end
+end