/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
// A list of memory blocks. Usually there is only one // but if we overrun our stack size we can get more memory.
StackBlock* mBlocks;
// The current block.
StackBlock* mCurBlock;
// Our stack of mark where push has been called.
StackMark* mMarks;
// The current top of the mark list.
uint32_t mStackTop;
// The size of the mark array.
uint32_t mMarkLength;
};
// Class for stack scoped arena memory allocations. // // Callers who wish to allocate memory whose lifetime corresponds to the // lifetime of a stack-allocated object can use this class. First, // declare an AutoStackArena object on the stack. Then all subsequent // calls to Allocate will allocate memory from an arena pool that will // be freed when that variable goes out of scope. Nesting is allowed. // // Individual allocations cannot exceed StackBlock::MAX_USABLE_SIZE // bytes. // class MOZ_RAII AutoStackArena { public:
AutoStackArena() : mOwnsStackArena(false) { if (!gStackArena) {
gStackArena = new StackArena();
mOwnsStackArena = true;
}
gStackArena->Push();
}
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