e68ff8e2ea
Standalone sample doesn't use libplatform for default platform implementation. This is needed for Oilpan GitHub mirror, which won't contain libplatform. Bug: v8:10724 Change-Id: I2e20ad157263a5073d0ba9ae8a2e211b2fcb35ed Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2310362 Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Omer Katz <omerkatz@chromium.org> Commit-Queue: Anton Bikineev <bikineev@chromium.org> Cr-Commit-Position: refs/heads/master@{#69016}
65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
// Copyright 2020 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <cppgc/allocation.h>
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#include <cppgc/default-platform.h>
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#include <cppgc/garbage-collected.h>
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#include <cppgc/heap.h>
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#include <cppgc/member.h>
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#include <cppgc/visitor.h>
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#include <iostream>
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#include <memory>
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#include <string>
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/**
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* This sample program shows how to set up a stand-alone cppgc heap.
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*/
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/**
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* Simple string rope to illustrate allocation and garbage collection below.
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* The rope keeps the next parts alive via regular managed reference.
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*/
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class Rope final : public cppgc::GarbageCollected<Rope> {
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public:
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explicit Rope(std::string part, Rope* next = nullptr)
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: part_(part), next_(next) {}
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void Trace(cppgc::Visitor* visitor) const { visitor->Trace(next_); }
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private:
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std::string part_;
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cppgc::Member<Rope> next_;
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friend std::ostream& operator<<(std::ostream& os, const Rope& rope) {
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os << rope.part_;
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if (rope.next_) {
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os << *rope.next_;
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}
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return os;
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}
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};
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int main(int argc, char* argv[]) {
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// Create a default platform that is used by cppgc::Heap for execution and
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// backend allocation.
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auto cppgc_platform = std::make_shared<cppgc::DefaultPlatform>();
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// Initialize the process. This must happen before any
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// cppgc::Heap::Create() calls.
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cppgc::InitializeProcess(cppgc_platform->GetPageAllocator());
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// Create a managed heap.
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std::unique_ptr<cppgc::Heap> heap = cppgc::Heap::Create(cppgc_platform);
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// Allocate a string rope on the managed heap.
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auto* greeting = cppgc::MakeGarbageCollected<Rope>(
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heap->GetAllocationHandle(), "Hello ",
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cppgc::MakeGarbageCollected<Rope>(heap->GetAllocationHandle(), "World!"));
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// Manually trigger garbage collection. The object greeting is held alive
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// through conservative stack scanning.
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heap->ForceGarbageCollectionSlow("CppGC stand-alone example", "Testing");
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std::cout << *greeting << std::endl;
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// Gracefully shutdown the process.
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cppgc::ShutdownProcess();
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return 0;
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}
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