Function reserve

src/e9patch/e9alloc.cpp:598–619

* Reserves a chunk of the virtual address space spanning the range [lb..ub]. * Returns `true` on success, `false` on failure. */

 * Returns `true` on success, `false` on failure.
 */
bool reserve(Binary *B, intptr_t lb, intptr_t ub)
{
    Allocator &allocator = B->allocator;
    if (!verify(lb, ub))
        return false;
    lb -= (lb % PAGE_SIZE);
    ub += (ub % PAGE_SIZE == 0? 0: PAGE_SIZE - ub % PAGE_SIZE);
    if (ub - lb <= 0)
        return false;
    uint32_t flags = 0;
    Node *n = insert(allocator.tree.root, lb, ub, (ub - lb), flags);
    if (n == nullptr)
        return false;
    if (allocator.tree.root == nullptr)
        allocator.tree.root = n;
    rebalanceInsert(&allocator.tree, n);

    Alloc *A = &n->alloc;
    A->T = nullptr;
    A->I = nullptr;
    return true;
}

/*
 * Deallocate an existing allocation.