123 lines
2.9 KiB
C++
123 lines
2.9 KiB
C++
// the License at http://www.mozilla.org/NPL/
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//
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// Software distributed under the License is distributed on an "AS
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// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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// implied. See the License for the specific language governing
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// rights and limitations under the License.
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//
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// The Original Code is the JavaScript 2 Prototype.
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//
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// The Initial Developer of the Original Code is Netscape
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// Communications Corporation. Portions created by Netscape are
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// Copyright (C) 2000 Netscape Communications Corporation. All
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// Rights Reserved.
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#include "gc_allocator.h"
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#include <iostream>
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#include <string>
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#include <vector>
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namespace JavaScript {
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/*
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template <class T>
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typename gc_allocator<T>::pointer
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gc_allocator<T>::allocate(gc_allocator<T>::size_type n, const void*)
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{
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return static_cast<pointer>(GC_malloc(n*sizeof(T)));
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}
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template <class T>
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void gc_allocator<T>::deallocate(gc_allocator<T>::pointer ptr, gc_allocator<T>::size_type)
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{
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// this can really be a NO-OP with the GC.
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// ::GC_free(static_cast<void*>(ptr));
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}
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*/
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}
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// test driver for standalone GC development.
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namespace JS = JavaScript;
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template <class T> struct gc_types {
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typedef std::basic_string<T, std::char_traits<T>, JS::gc_allocator<T> > string;
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typedef std::vector<T, JS::gc_allocator<T> > vector;
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};
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/**
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* Define a C++ class that is garbage collectable, and wants to have its destructor
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* called when it is finalized.
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*/
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class A {
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public:
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typedef JS::gc_traits_finalizable<A> traits;
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typedef JS::gc_allocator<A, traits> allocator;
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friend struct traits;
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void* operator new(std::size_t)
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{
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return allocator::allocate(1);
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}
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void operator delete(void*) {}
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A()
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{
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std::cout << "A::A() here." << std::endl;
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}
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private:
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~A()
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{
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std::cout << "A::~A() here." << std::endl;
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}
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};
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void main(int /* argc */, char* /* argv[] */)
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{
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using namespace std;
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using namespace JavaScript;
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cout << "testing the GC allocator." << endl;
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typedef gc_types<char>::string char_string;
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char_string str("This is a garbage collectable string.");
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cout << str << endl;
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// question, how can we partially evaluate a template?
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// can we say, typedef template <class T> vector<typename T>.
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// typedef vector<int, gc_allocator<int> > int_vector;
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typedef gc_types<int>::vector int_vector;
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// generate 1000 random values.
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int_vector values;
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for (int i = 0; i < 1000; ++i) {
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int value = rand();
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values.push_back(value);
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// allocate a random amount of garbage.
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if (!GC_malloc(static_cast<size_t>(value)))
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cerr << "GC_malloc failed." << endl;
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// allocate an object that has a finalizer to call its destructor.
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A* a = new A();
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}
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// run a collection.
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gc_allocator<void>::collect();
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// sort the values.
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sort(values.begin(), values.end());
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// print the values.
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int_vector::iterator iter = values.begin(), last = values.end();
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cout << *iter++;
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while (iter < last)
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cout << ' ' << *iter++;
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cout << endl;
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// finally, print the string again.
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cout << str << endl;
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}
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