Bug 945596 - Define getJitCompilerOption to confirm jit-compiler-options. r=nbp, r=h4writer

js/src/builtin/TestingFunctions.cpp

@@ -1127,6 +1127,30 @@ SetJitCompilerOption(JSContext *cx, unsigned argc, jsval *vp)
     return true;
 }
 
+static bool
+GetJitCompilerOptions(JSContext *cx, unsigned argc, jsval *vp)
+{
+    RootedObject info(cx, JS_NewObject(cx, nullptr, nullptr, nullptr));
+    if (!info)
+        return false;
+
+    RootedValue value(cx);
+
+#define JIT_COMPILER_MATCH(key, string)                         \
+    opt = JSJITCOMPILER_ ## key;                                \
+    value.setInt32(JS_GetGlobalJitCompilerOption(cx, opt));     \
+    if (!JS_SetProperty(cx, info, string, value))               \
+        return false;
+
+    JSJitCompilerOption opt = JSJITCOMPILER_NOT_AN_OPTION;
+    JIT_COMPILER_OPTIONS(JIT_COMPILER_MATCH);
+#undef JIT_COMPILER_MATCH
+
+    *vp = ObjectValue(*info);
+
+    return true;
+}
+
 static bool
 SetIonCheckGraphCoherency(JSContext *cx, unsigned argc, jsval *vp)
 {
@@ -1546,6 +1570,10 @@ static const JSFunctionSpecWithHelp TestingFunctions[] = {
 "  Returns whether asm.js compilation is currently available or whether it is disabled\n"
 "  (e.g., by the debugger)."),
 
+    JS_FN_HELP("getJitCompilerOptions", GetJitCompilerOptions, 0, 0,
+"getCompilerOptions()",
+"Return an object describing some of the JIT compiler options.\n"),
+
     JS_FN_HELP("isAsmJSModule", IsAsmJSModule, 1, 0,
 "isAsmJSModule(fn)",
 "  Returns whether the given value is a function containing \"use asm\" that has been\n"

js/src/jit-test/tests/ion/bug909997.js

@@ -21,6 +21,9 @@ var func = [method_A, method_B, method_C, method_D]
 for (var n = 0; n < 4; ++n) {
     setJitCompilerOption("baseline.enable", n & 1);
     setJitCompilerOption("ion.enable", n & 2 ? 1: 0);
+    var opt = getJitCompilerOptions();
+    assertEq(opt["baseline.enable"], n & 1);
+    assertEq(opt["ion.enable"], n & 2 ? 1 : 0);
     for (var i = 0; i < 1001; ++i)
         func[n]();
 }

js/src/jsapi.cpp

@@ -6040,6 +6040,26 @@ JS_SetGlobalJitCompilerOption(JSContext *cx, JSJitCompilerOption opt, uint32_t v
 #endif
 }
 
+JS_PUBLIC_API(int)
+JS_GetGlobalJitCompilerOption(JSContext *cx, JSJitCompilerOption opt)
+{
+#ifdef JS_ION
+    switch (opt) {
+      case JSJITCOMPILER_BASELINE_USECOUNT_TRIGGER:
+        return jit::js_JitOptions.baselineUsesBeforeCompile;
+      case JSJITCOMPILER_ION_USECOUNT_TRIGGER:
+        return jit::js_JitOptions.forcedDefaultIonUsesBeforeCompile;
+      case JSJITCOMPILER_ION_ENABLE:
+        return JS::ContextOptionsRef(cx).ion();
+      case JSJITCOMPILER_BASELINE_ENABLE:
+        return JS::ContextOptionsRef(cx).baseline();
+      default:
+        break;
+    }
+#endif
+    return 0;
+}
+
 /************************************************************************/
 
 #if !defined(STATIC_EXPORTABLE_JS_API) && !defined(STATIC_JS_API) && defined(XP_WIN)

js/src/jsapi.h

@@ -4557,6 +4557,8 @@ typedef enum JSJitCompilerOption {
 
 extern JS_PUBLIC_API(void)
 JS_SetGlobalJitCompilerOption(JSContext *cx, JSJitCompilerOption opt, uint32_t value);
+extern JS_PUBLIC_API(int)
+JS_GetGlobalJitCompilerOption(JSContext *cx, JSJitCompilerOption opt);
 
 /*
  * Convert a uint32_t index into a jsid.