1 files changed, 74 insertions, 0 deletions
diff --git a/js/src/gdb/tests/test-unwind.cpp b/js/src/gdb/tests/test-unwind.cpp
new file mode 100644
index 0000000000..13a82bf790
--- /dev/null
+++ b/js/src/gdb/tests/test-unwind.cpp
@@ -0,0 +1,74 @@
+#include "gdb-tests.h"
+#include "jsapi.h"  // sundry symbols not moved to more-specific headers yet
+#include "jsfriendapi.h"  // JSFunctionSpecWithHelp
+
+#include "jit/JitOptions.h"               // js::jit::JitOptions
+#include "js/CallArgs.h"                  // JS::CallArgs, JS::CallArgsFromVp
+#include "js/CompilationAndEvaluation.h"  // JS::Evaluate
+#include "js/CompileOptions.h"            // JS::CompileOptions
+#include "js/RootingAPI.h"                // JS::Rooted
+#include "js/SourceText.h"                // JS::Source{Ownership,Text}
+#include "js/Value.h"                     // JS::Value
+
+#include "mozilla/Utf8.h"  // mozilla::Utf8Unit
+
+#include <stdint.h>  // uint32_t
+#include <string.h>  // strlen
+
+static bool Something(JSContext* cx, unsigned argc, JS::Value* vp) {
+  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+  args.rval().setInt32(23);
+  breakpoint();
+  return true;
+}
+
+// clang-format off
+static const JSFunctionSpecWithHelp unwind_functions[] = {
+    JS_FN_HELP("something", Something, 0, 0,
+"something()",
+"  Test function for test-unwind."),
+    JS_FS_HELP_END
+};
+// clang-format on
+
+FRAGMENT(unwind, simple) {
+  using namespace JS;
+
+  JS::Rooted<JSObject*> global(cx, JS::CurrentGlobalOrNull(cx));
+  if (!JS_DefineFunctionsWithHelp(cx, global, unwind_functions)) {
+    return;
+  }
+
+  // Define an itercount property and use it to ensure Baseline compilation.
+  uint32_t threshold = js::jit::JitOptions.baselineJitWarmUpThreshold;
+  RootedValue val(cx, Int32Value(threshold + 10));
+  if (!JS_DefineProperty(cx, global, "itercount", val, 0)) {
+    return;
+  }
+
+  int line0 = __LINE__;
+  const char* bytes =
+      "\n"
+      "function unwindFunctionInner() {\n"
+      "    for (var i = 0; i < itercount; i++) {}\n"
+      "    return something();\n"
+      "}\n"
+      "\n"
+      "function unwindFunctionOuter() {\n"
+      "    for (var i = 0; i < itercount; i++) {}\n"
+      "    return unwindFunctionInner();\n"
+      "}\n"
+      "\n"
+      "unwindFunctionOuter();\n";
+
+  JS::CompileOptions opts(cx);
+  opts.setFileAndLine(__FILE__, line0 + 1);
+
+  JS::SourceText<mozilla::Utf8Unit> srcBuf;
+  if (!srcBuf.init(cx, bytes, strlen(bytes), JS::SourceOwnership::Borrowed)) {
+    return;
+  }
+
+  JS::Rooted<JS::Value> rval(cx);
+  JS::Evaluate(cx, opts, srcBuf, &rval);
+}