Tools/TestWebKitAPI/Tests/JavaScriptCore/DisallowVMEntry.cpp

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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#include "config.h"
#include <JavaScriptCore/DisallowVMEntry.h>
#include <JavaScriptCore/InitializeThreading.h>
#include <JavaScriptCore/VM.h>

namespace TestWebKitAPI {

using JSC::DisallowVMEntry;
using JSC::JSLockHolder;
using JSC::LargeHeap;
using JSC::VM;

static void enterScope(VM& vm, unsigned entryCount, unsigned remainingEntries)
{
    DisallowVMEntry disallowVMEntry(vm);
    EXPECT_EQ(vm.disallowVMEntryCount, entryCount);

    if (--remainingEntries)
        enterScope(vm, entryCount + 1, remainingEntries);

    EXPECT_EQ(vm.disallowVMEntryCount, entryCount);
}

TEST(JavaScriptCore_DisallowVMEntry, NestedScopes)
{
    WTF::initializeMainThread();
    JSC::initialize();

    VM& vm = VM::create(LargeHeap).leakRef();
    {
        JSLockHolder locker(vm);
        EXPECT_EQ(vm.disallowVMEntryCount, 0u);
        enterScope(vm, 1, 10);
        EXPECT_EQ(vm.disallowVMEntryCount, 0u);
    }
}

TEST(JavaScriptCore_DisallowVMEntry, CopyConstruction)
{
    WTF::initializeMainThread();
    JSC::initialize();

    VM& vm = VM::create(LargeHeap).leakRef();
    {
        JSLockHolder locker(vm);
        EXPECT_EQ(vm.disallowVMEntryCount, 0u);

        {
            DisallowVMEntry disallowVMEntry(vm);
            EXPECT_EQ(vm.disallowVMEntryCount, 1u);
            {
                DisallowVMEntry disallowVMEntry2(disallowVMEntry);
                EXPECT_EQ(vm.disallowVMEntryCount, 2u);
            }
            EXPECT_EQ(vm.disallowVMEntryCount, 1u);
        }

        EXPECT_EQ(vm.disallowVMEntryCount, 0u);
    }
}

TEST(JavaScriptCore_DisallowVMEntry, CopyAssignment)
{
    WTF::initializeMainThread();
    JSC::initialize();

    VM& vm = VM::create(LargeHeap).leakRef();
    {
        JSLockHolder locker(vm);
        EXPECT_EQ(vm.disallowVMEntryCount, 0u);

        {
            DisallowVMEntry disallowVMEntry(vm);
            EXPECT_EQ(vm.disallowVMEntryCount, 1u);
            {
                DisallowVMEntry disallowVMEntry2 = disallowVMEntry;
                EXPECT_EQ(vm.disallowVMEntryCount, 2u);

                disallowVMEntry = disallowVMEntry2;
                EXPECT_EQ(vm.disallowVMEntryCount, 2u);
            }
            EXPECT_EQ(vm.disallowVMEntryCount, 1u);
        }

        EXPECT_EQ(vm.disallowVMEntryCount, 0u);
    }
}

} // namespace TestWebKitAPI