1// Copyright 2012 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
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7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
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11//       with the distribution.
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13//       contributors may be used to endorse or promote products derived
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15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28
29#include "v8.h"
30
31#include "cctest.h"
32#include "compiler.h"
33#include "execution.h"
34#include "isolate.h"
35
36
37using namespace v8::internal;
38
39static v8::Persistent<v8::Context> env;
40
41
42void SetSeeds(Handle<ByteArray> seeds, uint32_t state0, uint32_t state1) {
43  for (int i = 0; i < 4; i++) {
44    seeds->set(i, static_cast<byte>(state0 >> (i * kBitsPerByte)));
45    seeds->set(i + 4, static_cast<byte>(state1 >> (i * kBitsPerByte)));
46  }
47}
48
49
50void TestSeeds(Handle<JSFunction> fun,
51               Handle<Context> context,
52               uint32_t state0,
53               uint32_t state1) {
54  bool has_pending_exception;
55  Handle<JSObject> global(context->global());
56  Handle<ByteArray> seeds(context->random_seed());
57
58  SetSeeds(seeds, state0, state1);
59  Handle<Object> value =
60      Execution::Call(fun, global, 0, NULL, &has_pending_exception);
61  CHECK(value->IsHeapNumber());
62  CHECK(fun->IsOptimized());
63  double crankshaft_value = HeapNumber::cast(*value)->value();
64
65  SetSeeds(seeds, state0, state1);
66  V8::FillHeapNumberWithRandom(*value, *context);
67  double runtime_value = HeapNumber::cast(*value)->value();
68  CHECK_EQ(runtime_value, crankshaft_value);
69}
70
71
72TEST(CrankshaftRandom) {
73  if (env.IsEmpty()) env = v8::Context::New();
74  // Skip test if crankshaft is disabled.
75  if (!V8::UseCrankshaft()) return;
76  v8::HandleScope scope;
77  env->Enter();
78
79  Handle<Context> context(Isolate::Current()->context());
80  Handle<JSObject> global(context->global());
81  Handle<ByteArray> seeds(context->random_seed());
82  bool has_pending_exception;
83
84  CompileRun("function f() { return Math.random(); }");
85
86  Object* symbol = FACTORY->LookupAsciiSymbol("f")->ToObjectChecked();
87  MaybeObject* fun_object =
88      context->global()->GetProperty(String::cast(symbol));
89  Handle<JSFunction> fun(JSFunction::cast(fun_object->ToObjectChecked()));
90
91  // Optimize function.
92  Execution::Call(fun, global, 0, NULL, &has_pending_exception);
93  Execution::Call(fun, global, 0, NULL, &has_pending_exception);
94  if (!fun->IsOptimized()) fun->MarkForLazyRecompilation();
95
96  // Test with some random values.
97  TestSeeds(fun, context, 0xC0C0AFFE, 0x31415926);
98  TestSeeds(fun, context, 0x01020304, 0xFFFFFFFF);
99  TestSeeds(fun, context, 0x00000001, 0x00000000);
100
101  // Test that we bail out to runtime when seeds are uninitialized (zeros).
102  SetSeeds(seeds, 0, 0);
103  Handle<Object> value =
104      Execution::Call(fun, global, 0, NULL, &has_pending_exception);
105  CHECK(value->IsHeapNumber());
106  CHECK(fun->IsOptimized());
107  double crankshaft_value = HeapNumber::cast(*value)->value();
108  CHECK_NE(0.0, crankshaft_value);
109}
110