Inline Math.random in crankshaft (ia32).

test/cctest/test-random.cc

+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#include "v8.h"
+
+#include "cctest.h"
+#include "compiler.h"
+#include "execution.h"
+#include "isolate.h"
+
+
+using namespace v8::internal;
+
+static v8::Persistent<v8::Context> env;
+
+
+void SetSeeds(Handle<ByteArray> seeds, uint32_t state0, uint32_t state1) {
+  for (int i = 0; i < 4; i++) {
+    seeds->set(i, static_cast<byte>(state0 >> (i * kBitsPerByte)));
+    seeds->set(i + 4, static_cast<byte>(state1 >> (i * kBitsPerByte)));
+  }
+}
+
+
+void TestSeeds(Handle<JSFunction> fun,
+               Handle<Context> context,
+               uint32_t state0,
+               uint32_t state1) {
+  bool has_pending_exception;
+  Handle<JSObject> global(context->global());
+  Handle<ByteArray> seeds(context->random_seed());
+
+  SetSeeds(seeds, state0, state1);
+  Handle<Object> value =
+      Execution::Call(fun, global, 0, NULL, &has_pending_exception);
+  CHECK(value->IsHeapNumber());
+  CHECK(fun->IsOptimized());
+  double crankshaft_value = HeapNumber::cast(*value)->value();
+
+  SetSeeds(seeds, state0, state1);
+  V8::FillHeapNumberWithRandom(*value, *context);
+  double runtime_value = HeapNumber::cast(*value)->value();
+  CHECK_EQ(runtime_value, crankshaft_value);
+}
+
+
+TEST(CrankshaftRandom) {
+  if (!FLAG_crankshaft) return;
+
+  if (env.IsEmpty()) env = v8::Context::New();
+  v8::HandleScope scope;
+  env->Enter();
+
+  Handle<Context> context(Isolate::Current()->context());
+  Handle<JSObject> global(context->global());
+  Handle<ByteArray> seeds(context->random_seed());
+  bool has_pending_exception;
+
+  CompileRun("function f() { return Math.random(); }");
+
+  Object* symbol = FACTORY->LookupAsciiSymbol("f")->ToObjectChecked();
+  MaybeObject* fun_object =
+      context->global()->GetProperty(String::cast(symbol));
+  Handle<JSFunction> fun(JSFunction::cast(fun_object->ToObjectChecked()));
+
+  // Optimize function.
+  Execution::Call(fun, global, 0, NULL, &has_pending_exception);
+  Execution::Call(fun, global, 0, NULL, &has_pending_exception);
+  fun->MarkForLazyRecompilation();
+
+  // Test with some random values.
+  TestSeeds(fun, context, 0xC0C0AFFE, 0x31415926);
+  TestSeeds(fun, context, 0x01020304, 0xFFFFFFFF);
+  TestSeeds(fun, context, 0x00000001, 0x00000000);
+
+  // Test that we bail out to runtime when seeds are uninitialized (zeros).
+  SetSeeds(seeds, 0, 0);
+  Handle<Object> value =
+      Execution::Call(fun, global, 0, NULL, &has_pending_exception);
+  CHECK(value->IsHeapNumber());
+  CHECK(fun->IsOptimized());
+  double crankshaft_value = HeapNumber::cast(*value)->value();
+  CHECK_NE(0.0, crankshaft_value);
+}