8c99b253af
Embedders may use cppgc (or v8::CppHeap) earlier than V8's Isolate and platform are initialized. Require explicit initialization of cppgc to avoid recurring init calls with potentially conflicting parameters. Bug: chromium:1056170 Change-Id: I613452954b322c9a5bf074eefd25107b4579958c Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2682648 Reviewed-by: Omer Katz <omerkatz@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#72573}
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
// 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 <cppgc/allocation.h>
|
|
#include <cppgc/default-platform.h>
|
|
#include <cppgc/garbage-collected.h>
|
|
#include <cppgc/heap.h>
|
|
#include <cppgc/member.h>
|
|
#include <cppgc/visitor.h>
|
|
|
|
#include <iostream>
|
|
#include <memory>
|
|
#include <string>
|
|
|
|
/**
|
|
* 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_(part), next_(next) {}
|
|
|
|
void Trace(cppgc::Visitor* visitor) const { visitor->Trace(next_); }
|
|
|
|
private:
|
|
std::string part_;
|
|
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>();
|
|
// Initialize the process. This must happen before any cppgc::Heap::Create()
|
|
// calls.
|
|
cppgc::DefaultPlatform::InitializeProcess(cppgc_platform.get());
|
|
// Create a managed heap.
|
|
std::unique_ptr<cppgc::Heap> heap = cppgc::Heap::Create(cppgc_platform);
|
|
// Allocate a string rope on the managed heap.
|
|
auto* 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;
|
|
}
|