Add m-esr52 at 52.6.0

1 files changed, 293 insertions, 0 deletions

diff --git a/js/src/perf/jsperf.cpp b/js/src/perf/jsperf.cpp
new file mode 100644
index 000000000..ca2db4458
--- /dev/null
+++ b/js/src/perf/jsperf.cpp
@@ -0,0 +1,293 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "perf/jsperf.h"
+
+#include "jscntxt.h" /* for error messages */
+#include "jsobj.h" /* for unwrapping without a context */
+
+using namespace js;
+using JS::PerfMeasurement;
+
+// You cannot forward-declare a static object in C++, so instead
+// we have to forward-declare the helper function that refers to it.
+static PerfMeasurement* GetPM(JSContext* cx, JS::HandleValue value, const char* fname);
+
+// Property access
+
+#define GETTER(name)                                                    \
+    static bool                                                         \
+    pm_get_##name(JSContext* cx, unsigned argc, Value* vp)              \
+    {                                                                   \
+        CallArgs args = CallArgsFromVp(argc, vp);                       \
+        PerfMeasurement* p = GetPM(cx, args.thisv(), #name);            \
+        if (!p)                                                         \
+            return false;                                               \
+        args.rval().setNumber(double(p->name));                         \
+        return true;                                                    \
+    }
+
+GETTER(cpu_cycles)
+GETTER(instructions)
+GETTER(cache_references)
+GETTER(cache_misses)
+GETTER(branch_instructions)
+GETTER(branch_misses)
+GETTER(bus_cycles)
+GETTER(page_faults)
+GETTER(major_page_faults)
+GETTER(context_switches)
+GETTER(cpu_migrations)
+GETTER(eventsMeasured)
+
+#undef GETTER
+
+// Calls
+
+static bool
+pm_start(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    PerfMeasurement* p = GetPM(cx, args.thisv(), "start");
+    if (!p)
+        return false;
+
+    p->start();
+    args.rval().setUndefined();
+    return true;
+}
+
+static bool
+pm_stop(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    PerfMeasurement* p = GetPM(cx, args.thisv(), "stop");
+    if (!p)
+        return false;
+
+    p->stop();
+    args.rval().setUndefined();
+    return true;
+}
+
+static bool
+pm_reset(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    PerfMeasurement* p = GetPM(cx, args.thisv(), "reset");
+    if (!p)
+        return false;
+
+    p->reset();
+    args.rval().setUndefined();
+    return true;
+}
+
+static bool
+pm_canMeasureSomething(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    PerfMeasurement* p = GetPM(cx, args.thisv(), "canMeasureSomething");
+    if (!p)
+        return false;
+
+    args.rval().setBoolean(p->canMeasureSomething());
+    return true;
+}
+
+static const uint8_t PM_FATTRS = JSPROP_READONLY | JSPROP_PERMANENT;
+static const JSFunctionSpec pm_fns[] = {
+    JS_FN("start",               pm_start,               0, PM_FATTRS),
+    JS_FN("stop",                pm_stop,                0, PM_FATTRS),
+    JS_FN("reset",               pm_reset,               0, PM_FATTRS),
+    JS_FN("canMeasureSomething", pm_canMeasureSomething, 0, PM_FATTRS),
+    JS_FS_END
+};
+
+static const uint8_t PM_PATTRS =
+    JSPROP_ENUMERATE | JSPROP_PERMANENT;
+
+#define GETTER(name)                            \
+    JS_PSG(#name, pm_get_##name, PM_PATTRS)
+
+static const JSPropertySpec pm_props[] = {
+    GETTER(cpu_cycles),
+    GETTER(instructions),
+    GETTER(cache_references),
+    GETTER(cache_misses),
+    GETTER(branch_instructions),
+    GETTER(branch_misses),
+    GETTER(bus_cycles),
+    GETTER(page_faults),
+    GETTER(major_page_faults),
+    GETTER(context_switches),
+    GETTER(cpu_migrations),
+    GETTER(eventsMeasured),
+    JS_PS_END
+};
+
+#undef GETTER
+
+// If this were C++ these would be "static const" members.
+
+#define CONSTANT(name) { #name, PerfMeasurement::name }
+
+static const struct pm_const {
+    const char* name;
+    PerfMeasurement::EventMask value;
+} pm_consts[] = {
+    CONSTANT(CPU_CYCLES),
+    CONSTANT(INSTRUCTIONS),
+    CONSTANT(CACHE_REFERENCES),
+    CONSTANT(CACHE_MISSES),
+    CONSTANT(BRANCH_INSTRUCTIONS),
+    CONSTANT(BRANCH_MISSES),
+    CONSTANT(BUS_CYCLES),
+    CONSTANT(PAGE_FAULTS),
+    CONSTANT(MAJOR_PAGE_FAULTS),
+    CONSTANT(CONTEXT_SWITCHES),
+    CONSTANT(CPU_MIGRATIONS),
+    CONSTANT(ALL),
+    CONSTANT(NUM_MEASURABLE_EVENTS),
+    { 0, PerfMeasurement::EventMask(0) }
+};
+
+#undef CONSTANT
+
+static bool pm_construct(JSContext* cx, unsigned argc, Value* vp);
+static void pm_finalize(JSFreeOp* fop, JSObject* obj);
+
+static const JSClassOps pm_classOps = {
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    pm_finalize
+};
+
+static const JSClass pm_class = {
+    "PerfMeasurement",
+    JSCLASS_HAS_PRIVATE |
+    JSCLASS_FOREGROUND_FINALIZE,
+    &pm_classOps
+};
+
+// Constructor and destructor
+
+static bool
+pm_construct(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+
+    uint32_t mask;
+    if (!args.hasDefined(0)) {
+        ReportMissingArg(cx, args.calleev(), 0);
+        return false;
+    }
+    if (!JS::ToUint32(cx, args[0], &mask))
+        return false;
+
+    JS::RootedObject obj(cx, JS_NewObjectForConstructor(cx, &pm_class, args));
+    if (!obj)
+        return false;
+
+    if (!JS_FreezeObject(cx, obj))
+        return false;
+
+    PerfMeasurement* p = cx->new_<PerfMeasurement>(PerfMeasurement::EventMask(mask));
+    if (!p) {
+        JS_ReportOutOfMemory(cx);
+        return false;
+    }
+
+    JS_SetPrivate(obj, p);
+    args.rval().setObject(*obj);
+    return true;
+}
+
+static void
+pm_finalize(JSFreeOp* fop, JSObject* obj)
+{
+    js::FreeOp::get(fop)->delete_(static_cast<PerfMeasurement*>(JS_GetPrivate(obj)));
+}
+
+// Helpers (declared above)
+
+static PerfMeasurement*
+GetPM(JSContext* cx, JS::HandleValue value, const char* fname)
+{
+    if (!value.isObject()) {
+        UniqueChars bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, value, nullptr);
+        if (!bytes)
+            return nullptr;
+        JS_ReportErrorNumberLatin1(cx, GetErrorMessage, 0, JSMSG_NOT_NONNULL_OBJECT, bytes.get());
+        return nullptr;
+    }
+    RootedObject obj(cx, &value.toObject());
+    PerfMeasurement* p = (PerfMeasurement*)
+        JS_GetInstancePrivate(cx, obj, &pm_class, nullptr);
+    if (p)
+        return p;
+
+    // JS_GetInstancePrivate only sets an exception if its last argument
+    // is nonzero, so we have to do it by hand.
+    JS_ReportErrorNumberASCII(cx, GetErrorMessage, 0, JSMSG_INCOMPATIBLE_PROTO,
+                              pm_class.name, fname, JS_GetClass(obj)->name);
+    return nullptr;
+}
+
+namespace JS {
+
+JSObject*
+RegisterPerfMeasurement(JSContext* cx, HandleObject globalArg)
+{
+    static const uint8_t PM_CATTRS = JSPROP_ENUMERATE|JSPROP_READONLY|JSPROP_PERMANENT;
+
+    RootedObject global(cx, globalArg);
+    RootedObject prototype(cx);
+    prototype = JS_InitClass(cx, global, nullptr /* parent */,
+                             &pm_class, pm_construct, 1,
+                             pm_props, pm_fns, 0, 0);
+    if (!prototype)
+        return 0;
+
+    RootedObject ctor(cx);
+    ctor = JS_GetConstructor(cx, prototype);
+    if (!ctor)
+        return 0;
+
+    for (const pm_const* c = pm_consts; c->name; c++) {
+        if (!JS_DefineProperty(cx, ctor, c->name, c->value, PM_CATTRS,
+                               JS_STUBGETTER, JS_STUBSETTER))
+            return 0;
+    }
+
+    if (!JS_FreezeObject(cx, prototype) ||
+        !JS_FreezeObject(cx, ctor)) {
+        return 0;
+    }
+
+    return prototype;
+}
+
+PerfMeasurement*
+ExtractPerfMeasurement(const Value& wrapper)
+{
+    if (wrapper.isPrimitive())
+        return 0;
+
+    // This is what JS_GetInstancePrivate does internally.  We can't
+    // call JS_anything from here, because we don't have a JSContext.
+    JSObject* obj = wrapper.toObjectOrNull();
+    if (obj->getClass() != js::Valueify(&pm_class))
+        return 0;
+
+    return (PerfMeasurement*) obj->as<js::NativeObject>().getPrivate();
+}
+
+} // namespace JS