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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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/. */
/*
* JS allocation policies.
*
* The allocators here are for system memory with lifetimes which are not
* managed by the GC. See the comment at the top of vm/MallocProvider.h.
*/
#ifndef jsalloc_h
#define jsalloc_h
#include "js/TypeDecls.h"
#include "js/Utility.h"
extern JS_PUBLIC_API(void) JS_ReportOutOfMemory(JSContext* cx);
namespace js {
enum class AllocFunction {
Malloc,
Calloc,
Realloc
};
struct ContextFriendFields;
/* Policy for using system memory functions and doing no error reporting. */
class SystemAllocPolicy
{
public:
template <typename T> T* maybe_pod_malloc(size_t numElems) { return js_pod_malloc<T>(numElems); }
template <typename T> T* maybe_pod_calloc(size_t numElems) { return js_pod_calloc<T>(numElems); }
template <typename T> T* maybe_pod_realloc(T* p, size_t oldSize, size_t newSize) {
return js_pod_realloc<T>(p, oldSize, newSize);
}
template <typename T> T* pod_malloc(size_t numElems) { return maybe_pod_malloc<T>(numElems); }
template <typename T> T* pod_calloc(size_t numElems) { return maybe_pod_calloc<T>(numElems); }
template <typename T> T* pod_realloc(T* p, size_t oldSize, size_t newSize) {
return maybe_pod_realloc<T>(p, oldSize, newSize);
}
void free_(void* p) { js_free(p); }
void reportAllocOverflow() const {}
bool checkSimulatedOOM() const {
return !js::oom::ShouldFailWithOOM();
}
};
class ExclusiveContext;
JS_FRIEND_API(void) ReportOutOfMemory(ExclusiveContext* cxArg);
/*
* Allocation policy that calls the system memory functions and reports errors
* to the context. Since the JSContext given on construction is stored for
* the lifetime of the container, this policy may only be used for containers
* whose lifetime is a shorter than the given JSContext.
*
* FIXME bug 647103 - rewrite this in terms of temporary allocation functions,
* not the system ones.
*/
class TempAllocPolicy
{
ContextFriendFields* const cx_;
/*
* Non-inline helper to call JSRuntime::onOutOfMemory with minimal
* code bloat.
*/
JS_FRIEND_API(void*) onOutOfMemory(AllocFunction allocFunc, size_t nbytes,
void* reallocPtr = nullptr);
template <typename T>
T* onOutOfMemoryTyped(AllocFunction allocFunc, size_t numElems, void* reallocPtr = nullptr) {
size_t bytes;
if (MOZ_UNLIKELY(!CalculateAllocSize<T>(numElems, &bytes)))
return nullptr;
return static_cast<T*>(onOutOfMemory(allocFunc, bytes, reallocPtr));
}
public:
MOZ_IMPLICIT TempAllocPolicy(JSContext* cx) : cx_((ContextFriendFields*) cx) {} // :(
MOZ_IMPLICIT TempAllocPolicy(ContextFriendFields* cx) : cx_(cx) {}
template <typename T>
T* maybe_pod_malloc(size_t numElems) {
return js_pod_malloc<T>(numElems);
}
template <typename T>
T* maybe_pod_calloc(size_t numElems) {
return js_pod_calloc<T>(numElems);
}
template <typename T>
T* maybe_pod_realloc(T* prior, size_t oldSize, size_t newSize) {
return js_pod_realloc<T>(prior, oldSize, newSize);
}
template <typename T>
T* pod_malloc(size_t numElems) {
T* p = maybe_pod_malloc<T>(numElems);
if (MOZ_UNLIKELY(!p))
p = onOutOfMemoryTyped<T>(AllocFunction::Malloc, numElems);
return p;
}
template <typename T>
T* pod_calloc(size_t numElems) {
T* p = maybe_pod_calloc<T>(numElems);
if (MOZ_UNLIKELY(!p))
p = onOutOfMemoryTyped<T>(AllocFunction::Calloc, numElems);
return p;
}
template <typename T>
T* pod_realloc(T* prior, size_t oldSize, size_t newSize) {
T* p2 = maybe_pod_realloc<T>(prior, oldSize, newSize);
if (MOZ_UNLIKELY(!p2))
p2 = onOutOfMemoryTyped<T>(AllocFunction::Realloc, newSize, prior);
return p2;
}
void free_(void* p) {
js_free(p);
}
JS_FRIEND_API(void) reportAllocOverflow() const;
bool checkSimulatedOOM() const {
if (js::oom::ShouldFailWithOOM()) {
js::ReportOutOfMemory(reinterpret_cast<ExclusiveContext*>(cx_));
return false;
}
return true;
}
};
} /* namespace js */
#endif /* jsalloc_h */
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