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// Copyright 2020 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 <iostream>
#include <memory>
#include <string>
#include "include/cppgc/allocation.h"
#include "include/cppgc/default-platform.h"
#include "include/cppgc/garbage-collected.h"
#include "include/cppgc/heap.h"
#include "include/cppgc/member.h"
#include "include/cppgc/visitor.h"
#if !CPPGC_IS_STANDALONE
#include "include/v8-initialization.h"
#endif // !CPPGC_IS_STANDALONE
/**
* This sample program shows how to set up a stand-alone cppgc heap.
*/
/**
* Simple string rope to illustrate allocation and garbage collection below.
* The rope keeps the next parts alive via regular managed reference.
*/
class Rope final : public cppgc::GarbageCollected<Rope> {
public:
explicit Rope(std::string part, Rope* next = nullptr)
: part_(std::move(part)), next_(next) {}
void Trace(cppgc::Visitor* visitor) const { visitor->Trace(next_); }
private:
const std::string part_;
const cppgc::Member<Rope> next_;
friend std::ostream& operator<<(std::ostream& os, const Rope& rope) {
os << rope.part_;
if (rope.next_) {
os << *rope.next_;
}
return os;
}
};
int main(int argc, char* argv[]) {
// Create a default platform that is used by cppgc::Heap for execution and
// backend allocation.
auto cppgc_platform = std::make_shared<cppgc::DefaultPlatform>();
#if !CPPGC_IS_STANDALONE
// When initializing a stand-alone cppgc heap in a regular V8 build, the
// internal V8 platform will be reused. Reusing the V8 platform requires
// initializing it properly.
v8::V8::InitializePlatform(cppgc_platform->GetV8Platform());
#endif // !CPPGC_IS_STANDALONE
// Initialize the process. This must happen before any cppgc::Heap::Create()
// calls.
cppgc::InitializeProcess(cppgc_platform->GetPageAllocator());
{
// Create a managed heap.
std::unique_ptr<cppgc::Heap> heap = cppgc::Heap::Create(cppgc_platform);
// Allocate a string rope on the managed heap.
Rope* greeting = cppgc::MakeGarbageCollected<Rope>(
heap->GetAllocationHandle(), "Hello ",
cppgc::MakeGarbageCollected<Rope>(heap->GetAllocationHandle(),
"World!"));
// Manually trigger garbage collection. The object greeting is held alive
// through conservative stack scanning.
heap->ForceGarbageCollectionSlow("CppGC example", "Testing");
std::cout << *greeting << std::endl;
}
// Gracefully shutdown the process.
cppgc::ShutdownProcess();
return 0;
}
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