1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jsalloc.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,88 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/*
1.11 + * JS allocation policies.
1.12 + *
1.13 + * The allocators here are for system memory with lifetimes which are not
1.14 + * managed by the GC. See the comment at the top of vm/MallocProvider.h.
1.15 + */
1.16 +
1.17 +#ifndef jsalloc_h
1.18 +#define jsalloc_h
1.19 +
1.20 +#include "js/TypeDecls.h"
1.21 +#include "js/Utility.h"
1.22 +
1.23 +namespace js {
1.24 +
1.25 +class ContextFriendFields;
1.26 +
1.27 +/* Policy for using system memory functions and doing no error reporting. */
1.28 +class SystemAllocPolicy
1.29 +{
1.30 + public:
1.31 + void *malloc_(size_t bytes) { return js_malloc(bytes); }
1.32 + void *calloc_(size_t bytes) { return js_calloc(bytes); }
1.33 + void *realloc_(void *p, size_t oldBytes, size_t bytes) { return js_realloc(p, bytes); }
1.34 + void free_(void *p) { js_free(p); }
1.35 + void reportAllocOverflow() const {}
1.36 +};
1.37 +
1.38 +/*
1.39 + * Allocation policy that calls the system memory functions and reports errors
1.40 + * to the context. Since the JSContext given on construction is stored for
1.41 + * the lifetime of the container, this policy may only be used for containers
1.42 + * whose lifetime is a shorter than the given JSContext.
1.43 + *
1.44 + * FIXME bug 647103 - rewrite this in terms of temporary allocation functions,
1.45 + * not the system ones.
1.46 + */
1.47 +class TempAllocPolicy
1.48 +{
1.49 + ContextFriendFields *const cx_;
1.50 +
1.51 + /*
1.52 + * Non-inline helper to call JSRuntime::onOutOfMemory with minimal
1.53 + * code bloat.
1.54 + */
1.55 + JS_FRIEND_API(void *) onOutOfMemory(void *p, size_t nbytes);
1.56 +
1.57 + public:
1.58 + TempAllocPolicy(JSContext *cx) : cx_((ContextFriendFields *) cx) {} // :(
1.59 + TempAllocPolicy(ContextFriendFields *cx) : cx_(cx) {}
1.60 +
1.61 + void *malloc_(size_t bytes) {
1.62 + void *p = js_malloc(bytes);
1.63 + if (MOZ_UNLIKELY(!p))
1.64 + p = onOutOfMemory(nullptr, bytes);
1.65 + return p;
1.66 + }
1.67 +
1.68 + void *calloc_(size_t bytes) {
1.69 + void *p = js_calloc(bytes);
1.70 + if (MOZ_UNLIKELY(!p))
1.71 + p = onOutOfMemory(nullptr, bytes);
1.72 + return p;
1.73 + }
1.74 +
1.75 + void *realloc_(void *p, size_t oldBytes, size_t bytes) {
1.76 + void *p2 = js_realloc(p, bytes);
1.77 + if (MOZ_UNLIKELY(!p2))
1.78 + p2 = onOutOfMemory(p2, bytes);
1.79 + return p2;
1.80 + }
1.81 +
1.82 + void free_(void *p) {
1.83 + js_free(p);
1.84 + }
1.85 +
1.86 + JS_FRIEND_API(void) reportAllocOverflow() const;
1.87 +};
1.88 +
1.89 +} /* namespace js */
1.90 +
1.91 +#endif /* jsalloc_h */
