The Tor Browser: js/src/jsalloc.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 /*

     8  * JS allocation policies.

     9  *

    10  * The allocators here are for system memory with lifetimes which are not

    11  * managed by the GC. See the comment at the top of vm/MallocProvider.h.

    12  */

    14 #ifndef jsalloc_h

    15 #define jsalloc_h

    17 #include "js/TypeDecls.h"

    18 #include "js/Utility.h"

    20 namespace js {

    22 class ContextFriendFields;

    24 /* Policy for using system memory functions and doing no error reporting. */

    25 class SystemAllocPolicy

    26 {

    27   public:

    28     void *malloc_(size_t bytes) { return js_malloc(bytes); }

    29     void *calloc_(size_t bytes) { return js_calloc(bytes); }

    30     void *realloc_(void *p, size_t oldBytes, size_t bytes) { return js_realloc(p, bytes); }

    31     void free_(void *p) { js_free(p); }

    32     void reportAllocOverflow() const {}

    33 };

    35 /*

    36  * Allocation policy that calls the system memory functions and reports errors

    37  * to the context. Since the JSContext given on construction is stored for

    38  * the lifetime of the container, this policy may only be used for containers

    39  * whose lifetime is a shorter than the given JSContext.

    40  *

    41  * FIXME bug 647103 - rewrite this in terms of temporary allocation functions,

    42  * not the system ones.

    43  */

    44 class TempAllocPolicy

    45 {

    46     ContextFriendFields *const cx_;

    48     /*

    49      * Non-inline helper to call JSRuntime::onOutOfMemory with minimal

    50      * code bloat.

    51      */

    52     JS_FRIEND_API(void *) onOutOfMemory(void *p, size_t nbytes);

    54   public:

    55     TempAllocPolicy(JSContext *cx) : cx_((ContextFriendFields *) cx) {} // :(

    56     TempAllocPolicy(ContextFriendFields *cx) : cx_(cx) {}

    58     void *malloc_(size_t bytes) {

    59         void *p = js_malloc(bytes);

    60         if (MOZ_UNLIKELY(!p))

    61             p = onOutOfMemory(nullptr, bytes);

    62         return p;

    63     }

    65     void *calloc_(size_t bytes) {

    66         void *p = js_calloc(bytes);

    67         if (MOZ_UNLIKELY(!p))

    68             p = onOutOfMemory(nullptr, bytes);

    69         return p;

    70     }

    72     void *realloc_(void *p, size_t oldBytes, size_t bytes) {

    73         void *p2 = js_realloc(p, bytes);

    74         if (MOZ_UNLIKELY(!p2))

    75             p2 = onOutOfMemory(p2, bytes);

    76         return p2;

    77     }

    79     void free_(void *p) {

    80         js_free(p);

    81     }

    83     JS_FRIEND_API(void) reportAllocOverflow() const;

    84 };

    86 } /* namespace js */

    88 #endif /* jsalloc_h */

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