v8/test/cctest/test-usecounters.cc

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// 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(DefineGetterSetterThrowUseCount) {
i::FLAG_harmony_strict_legacy_accessor_builtins = false;
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);
// __defineGetter__ and __defineSetter__ do not increment
// kDefineGetterOrSetterWouldThrow on success
CompileRun(
"var a = {};"
"Object.defineProperty(a, 'b', { value: 0, configurable: true });"
"a.__defineGetter__('b', ()=>{});");
CHECK_EQ(0, use_counts[v8::Isolate::kDefineGetterOrSetterWouldThrow]);
CompileRun(
"var a = {};"
"Object.defineProperty(a, 'b', { value: 0, configurable: true });"
"a.__defineSetter__('b', ()=>{});");
CHECK_EQ(0, use_counts[v8::Isolate::kDefineGetterOrSetterWouldThrow]);
// __defineGetter__ and __defineSetter__ do not increment
// kDefineGetterOrSetterWouldThrow on other errors
v8::Local<v8::Value> resultProxyThrow = CompileRun(
"var exception;"
"try {"
"var a = new Proxy({}, { defineProperty: ()=>{throw new Error;} });"
"a.__defineGetter__('b', ()=>{});"
"} catch (e) { exception = e; }"
"exception");
CHECK_EQ(0, use_counts[v8::Isolate::kDefineGetterOrSetterWouldThrow]);
CHECK(resultProxyThrow->IsObject());
resultProxyThrow = CompileRun(
"var exception;"
"try {"
"var a = new Proxy({}, { defineProperty: ()=>{throw new Error;} });"
"a.__defineSetter__('b', ()=>{});"
"} catch (e) { exception = e; }"
"exception");
CHECK_EQ(0, use_counts[v8::Isolate::kDefineGetterOrSetterWouldThrow]);
CHECK(resultProxyThrow->IsObject());
// __defineGetter__ and __defineSetter__ increment
// kDefineGetterOrSetterWouldThrow when they would throw per spec (B.2.2.2)
CompileRun(
"var a = {};"
"Object.defineProperty(a, 'b', { value: 0, configurable: false });"
"a.__defineGetter__('b', ()=>{});");
CHECK_EQ(1, use_counts[v8::Isolate::kDefineGetterOrSetterWouldThrow]);
CompileRun(
"var a = {};"
"Object.defineProperty(a, 'b', { value: 0, configurable: false });"
"a.__defineSetter__('b', ()=>{});");
CHECK_EQ(2, use_counts[v8::Isolate::kDefineGetterOrSetterWouldThrow]);
}
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(LabeledExpressionStatement) {
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("typeof a");
CHECK_EQ(0, use_counts[v8::Isolate::kLabeledExpressionStatement]);
CompileRun("foo: null");
CHECK_EQ(1, use_counts[v8::Isolate::kLabeledExpressionStatement]);
CompileRun("foo: bar: baz: undefined");
CHECK_EQ(2, use_counts[v8::Isolate::kLabeledExpressionStatement]);
CompileRun(
"foo: if (false);"
"bar: { }"
"baz: switch (false) { }"
"bat: do { } while (false);");
CHECK_EQ(2, use_counts[v8::Isolate::kLabeledExpressionStatement]);
}
TEST(IndexAccessorUseCount) {
i::FLAG_harmony_strict_legacy_accessor_builtins = false;
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);
// Adding accessor to named property does not increment kIndexAccessor
CompileRun(
"var a = {};"
"function dummy(){}"
"Object.defineProperty(a, 'test', { get: dummy, set: dummy });");
CHECK_EQ(0, use_counts[v8::Isolate::kIndexAccessor]);
// Setting index to value does not increment kIndexAccessor
CompileRun(
"var a = {};"
"Object.defineProperty(a, '0', { value: 0 });");
CHECK_EQ(0, use_counts[v8::Isolate::kIndexAccessor]);
// Non-integer number index not increment kIndexAccessor
CompileRun(
"var a = {};"
"Object.defineProperty(a, '2.5', { value: 0 });");
CHECK_EQ(0, use_counts[v8::Isolate::kIndexAccessor]);
// Setting index accessor increments count
CompileRun(
"var a = {};"
"function dummy(){}"
"Object.defineProperty(a, '0', { get : dummy, set : dummy });");
CHECK_EQ(1, use_counts[v8::Isolate::kIndexAccessor]);
// Setting index accessor on array increments count
CompileRun(
"var a = [];"
"function dummy(){}"
"Object.defineProperty(a, '0', { get : dummy, set : dummy });");
CHECK_EQ(2, use_counts[v8::Isolate::kIndexAccessor]);
// __defineGetter__ increments count
CompileRun(
"var a = [];"
"function dummy(){}"
"a.__defineGetter__('0', dummy);");
CHECK_EQ(3, use_counts[v8::Isolate::kIndexAccessor]);
}
} // namespace test_usecounters
} // namespace internal
} // namespace v8