test/cctest/test-usecounters.cc

// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/v8.h"

#include "test/cctest/cctest.h"

namespace v8 {
namespace internal {
namespace test_usecounters {

int* global_use_counts = nullptr;

void MockUseCounterCallback(v8::Isolate* isolate,
                            v8::Isolate::UseCounterFeature feature) {
  ++global_use_counts[feature];
}

TEST(AssigmentExpressionLHSIsCall) {
  v8::Isolate* isolate = CcTest::isolate();
  v8::HandleScope scope(isolate);
  LocalContext env;
  int use_counts[v8::Isolate::kUseCounterFeatureCount] = {};
  global_use_counts = use_counts;
  CcTest::isolate()->SetUseCounterCallback(MockUseCounterCallback);

  // AssignmentExpressions whose LHS is not a call do not increment counters
  CompileRun("function f(){ a = 0; a()[b] = 0; }");
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy]);
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict]);
  CompileRun("function f(){ ++a; ++a()[b]; }");
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy]);
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict]);
  CompileRun("function f(){ 'use strict'; a = 0; a()[b] = 0; }");
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy]);
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict]);
  CompileRun("function f(){ 'use strict'; ++a; ++a()[b]; }");
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy]);
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict]);

  // AssignmentExpressions whose LHS is a call increment appropriate counters
  CompileRun("function f(){ a() = 0; }");
  CHECK_NE(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy]);
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict]);
  use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy] = 0;
  CompileRun("function f(){ 'use strict'; a() = 0; }");
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy]);
  CHECK_NE(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict]);
  use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict] = 0;

  // UpdateExpressions whose LHS is a call increment appropriate counters
  CompileRun("function f(){ ++a(); }");
  CHECK_NE(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy]);
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict]);
  use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy] = 0;
  CompileRun("function f(){ 'use strict'; ++a(); }");
  CHECK_EQ(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInSloppy]);
  CHECK_NE(0, use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict]);
  use_counts[v8::Isolate::kAssigmentExpressionLHSIsCallInStrict] = 0;
}

TEST(AtomicsWakeAndAtomicsNotify) {
  v8::Isolate* isolate = CcTest::isolate();
  v8::HandleScope scope(isolate);
  LocalContext env;
  int use_counts[v8::Isolate::kUseCounterFeatureCount] = {};
  global_use_counts = use_counts;
  i::FLAG_harmony_sharedarraybuffer = true;
  CcTest::isolate()->SetUseCounterCallback(MockUseCounterCallback);

  CompileRun("Atomics.wake(new Int32Array(new SharedArrayBuffer(16)), 0);");
  CHECK_EQ(1, use_counts[v8::Isolate::kAtomicsWake]);
  CHECK_EQ(0, use_counts[v8::Isolate::kAtomicsNotify]);

  use_counts[v8::Isolate::kAtomicsWake] = 0;
  use_counts[v8::Isolate::kAtomicsNotify] = 0;

  CompileRun("Atomics.notify(new Int32Array(new SharedArrayBuffer(16)), 0);");
  CHECK_EQ(0, use_counts[v8::Isolate::kAtomicsWake]);
  CHECK_EQ(1, use_counts[v8::Isolate::kAtomicsNotify]);
}

TEST(OverrideReadOnlyPropertyOnPrototype) {
  v8::Isolate* isolate = CcTest::isolate();
  v8::HandleScope scope(isolate);
  LocalContext env;
  int use_counts[v8::Isolate::kUseCounterFeatureCount] = {};
  global_use_counts = use_counts;
  CcTest::isolate()->SetUseCounterCallback(MockUseCounterCallback);
  using Isolate = v8::Isolate;

  // Initial setup
  CompileRun(
      "Object.defineProperty(Object.prototype, 'readonly', "
      "{ enumerable: true, configurable: true, writable: false, "
      "  value: 'readonly' });");
  CHECK_EQ(0, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy]);
  CHECK_EQ(0, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict]);

  // StoreIC Sloppy
  CompileRun(
      "function sloppy() { let sloppy = {}; sloppy.readonly = 'override'; }"
      "sloppy();");
  CHECK_EQ(1, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy]);
  CHECK_EQ(0, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict]);
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy] = 0;
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict] = 0;

  // StoreIC Sloppy (one-shot)
  CompileRun("let sloppyob = {}; sloppyob.readonly = 'override';");
  CHECK_EQ(1, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy]);
  CHECK_EQ(0, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict]);
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy] = 0;
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict] = 0;

  // StoreIC Strict
  {
    v8::TryCatch try_catch(isolate);
    CompileRun(
        "function strict() {"
        "    'use strict'; let strict = {}; strict.readonly = 'override';"
        "}"
        "strict();");
    CHECK_EQ(0, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy]);
    CHECK_EQ(1, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict]);
    CHECK(try_catch.HasCaught());
  }
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy] = 0;
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict] = 0;

  // StoreIC Strict (one-shot)
  {
    v8::TryCatch try_catch(isolate);
    CompileRun(
        "'use strict';"
        "let strictob = {}; strictob.readonly = 'override';");
    CHECK_EQ(0, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy]);
    CHECK_EQ(1, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict]);
    CHECK(try_catch.HasCaught());
  }
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy] = 0;
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict] = 0;

  // KeyedStoreIC Sloppy
  CompileRun(
      "function sloppy2() { let sloppy = {}; sloppy['readonly'] = 'override'; }"
      "sloppy2();");
  CHECK_EQ(1, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy]);
  CHECK_EQ(0, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict]);
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy] = 0;
  use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict] = 0;

  // KeyedStoreIC Strict
  {
    v8::TryCatch try_catch(isolate);
    CompileRun(
        "function strict2() {"
        "    'use strict'; let strict = {}; strict['readonly'] = 'override';"
        "}"
        "strict2();");
    CHECK_EQ(0, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeSloppy]);
    CHECK_EQ(1, use_counts[Isolate::kAttemptOverrideReadOnlyOnPrototypeStrict]);
    CHECK(try_catch.HasCaught());
  }
}

TEST(RegExpMatchIsTrueishOnNonJSRegExp) {
  v8::Isolate* isolate = CcTest::isolate();
  v8::HandleScope scope(isolate);
  LocalContext env;
  int use_counts[v8::Isolate::kUseCounterFeatureCount] = {};
  global_use_counts = use_counts;
  CcTest::isolate()->SetUseCounterCallback(MockUseCounterCallback);

  CompileRun("new RegExp(/./); new RegExp('');");
  CHECK_EQ(0, use_counts[v8::Isolate::kRegExpMatchIsTrueishOnNonJSRegExp]);
  CHECK_EQ(0, use_counts[v8::Isolate::kRegExpMatchIsFalseishOnJSRegExp]);

  CompileRun("let p = { [Symbol.match]: true }; new RegExp(p);");
  CHECK_EQ(1, use_counts[v8::Isolate::kRegExpMatchIsTrueishOnNonJSRegExp]);
  CHECK_EQ(0, use_counts[v8::Isolate::kRegExpMatchIsFalseishOnJSRegExp]);
}

TEST(RegExpMatchIsFalseishOnJSRegExp) {
  v8::Isolate* isolate = CcTest::isolate();
  v8::HandleScope scope(isolate);
  LocalContext env;
  int use_counts[v8::Isolate::kUseCounterFeatureCount] = {};
  global_use_counts = use_counts;
  CcTest::isolate()->SetUseCounterCallback(MockUseCounterCallback);

  CompileRun("new RegExp(/./); new RegExp('');");
  CHECK_EQ(0, use_counts[v8::Isolate::kRegExpMatchIsTrueishOnNonJSRegExp]);
  CHECK_EQ(0, use_counts[v8::Isolate::kRegExpMatchIsFalseishOnJSRegExp]);

  CompileRun("let p = /./; p[Symbol.match] = false; new RegExp(p);");
  CHECK_EQ(0, use_counts[v8::Isolate::kRegExpMatchIsTrueishOnNonJSRegExp]);
  CHECK_EQ(1, use_counts[v8::Isolate::kRegExpMatchIsFalseishOnJSRegExp]);
}

}  // namespace test_usecounters
}  // namespace internal
}  // namespace v8