source: trunk/icedtea-web/tests/cpp-unit-tests/checked_allocations.cc

/* Copyright (C) 2012 Red Hat

 This file is part of IcedTea.

 IcedTea is free software; you can redistribute it and/or modify
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 General Public License for more details.

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 along with IcedTea; see the file COPYING.  If not, write to the
 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 02110-1301 USA.

 Linking this library statically or dynamically with other modules is
 making a combined work based on this library.  Thus, the terms and
 conditions of the GNU General Public License cover the whole
 combination.

 As a special exception, the copyright holders of this library give you
 permission to link this library with independent modules to produce an
 executable, regardless of the license terms of these independent
 modules, and to copy and distribute the resulting executable under
 terms of your choice, provided that you also meet, for each linked
 independent module, the terms and conditions of the license of that
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//  Overrides global 'new' operator with one that does error checking.

#include <new>

#include <UnitTest++.h>
#include "checked_allocations.h"

// We keep a set of allocations, that, for obvious reasons, does not itself use the 'new' operator.
static AllocationSet* __allocations = NULL;

// Override global definition of new and delete!
void* operator new(size_t size) throw (std::bad_alloc) {
    if (!__allocations) {
        // This uses placement-new, which calls the constructor on a specific memory location
        // This is needed because we cannot call 'new' in this context, nor can we rely on static-initialization
        // for the set to occur before any call to 'new'!
        void* memory = malloc(sizeof(AllocationSet));
        __allocations = new (memory) AllocationSet();
    }

    void* mem = malloc(size);
    if (mem == 0) {
        throw std::bad_alloc(); // ANSI/ISO compliant behavior
    }
    __allocations->insert(mem);
    return mem;
}

void operator delete(void* ptr) throw () {
    if (__allocations->erase(ptr)) {
        free(ptr);
    } else {
        printf(
                "Attempt to free memory with operator 'delete' that was not allocated by 'new'!\n");
        CHECK(false);
    }
}

int cpp_unfreed_allocations() {
    return __allocations->size();
}