Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 255 insertions, 0 deletions

diff --git a/js/src/vm/MallocProvider.h b/js/src/vm/MallocProvider.h
new file mode 100644
index 0000000000..b9ce9b0a4f
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+++ b/js/src/vm/MallocProvider.h
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+/* -*- 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/. */
+
+/*
+ * Hierarchy of SpiderMonkey system memory allocators:
+ *
+ *   - System {m,c,re}alloc/new/free: Overridden by jemalloc in most
+ *     environments. Do not use these functions directly.
+ *
+ *   - js_{m,c,re}alloc/new/free: Wraps the system allocators and adds a
+ *     failure injection framework for use by the fuzzers as well as templated,
+ *     typesafe variants. See js/public/Utility.h.
+ *
+ *   - AllocPolicy: An interface for the js allocators, for use with templates.
+ *     These allocators are for system memory whose lifetime is not associated
+ *     with a GC thing. See js/public/AllocPolicy.h.
+ *
+ *       - SystemAllocPolicy: No extra functionality over bare allocators.
+ *
+ *       - TempAllocPolicy: Adds automatic error reporting to the provided
+ *         JSContext when allocations fail.
+ *
+ *       - ZoneAllocPolicy: Forwards to the Zone MallocProvider.
+ *
+ *   - MallocProvider. A mixin base class that handles automatically updating
+ *     the GC's state in response to allocations that are tied to a GC lifetime
+ *     or are for a particular GC purpose. These allocators must only be used
+ *     for memory that will be freed when a GC thing is swept.
+ *
+ *       - gc::Zone:  Automatically triggers zone GC.
+ *       - JSRuntime: Automatically triggers full GC.
+ *       - JSContext: Dispatches directly to the runtime.
+ */
+
+#ifndef vm_MallocProvider_h
+#define vm_MallocProvider_h
+
+#include "mozilla/Attributes.h"  // MOZ_ALWAYS_INLINE
+#include "mozilla/Likely.h"      // MOZ_LIKELY, MOZ_UNLIKELY
+
+#include <stddef.h>  // size_t
+#include <stdint.h>  // uint8_t
+
+#include "js/AllocPolicy.h"  // AllocFunction
+#include "js/UniquePtr.h"    // UniquePtr
+#include "js/Utility.h"  // js_malloc, MallocArena, CalculateAllocSize, CalculateAllocSizeWithExtra, JS::FreePolicy
+
+namespace js {
+
+template <class Client>
+struct MallocProvider {
+  template <class T>
+  T* maybe_pod_arena_malloc(arena_id_t arena, size_t numElems) {
+    T* p = js_pod_arena_malloc<T>(arena, numElems);
+    if (MOZ_LIKELY(p)) {
+      client()->updateMallocCounter(numElems * sizeof(T));
+    }
+    return p;
+  }
+
+  template <class T>
+  T* maybe_pod_arena_calloc(arena_id_t arena, size_t numElems) {
+    T* p = js_pod_arena_calloc<T>(arena, numElems);
+    if (MOZ_LIKELY(p)) {
+      client()->updateMallocCounter(numElems * sizeof(T));
+    }
+    return p;
+  }
+
+  template <class T>
+  T* maybe_pod_arena_realloc(arena_id_t arena, T* prior, size_t oldSize,
+                             size_t newSize) {
+    T* p = js_pod_arena_realloc<T>(arena, prior, oldSize, newSize);
+    if (MOZ_LIKELY(p)) {
+      // For compatibility we do not account for realloc that decreases
+      // previously allocated memory.
+      if (newSize > oldSize) {
+        client()->updateMallocCounter((newSize - oldSize) * sizeof(T));
+      }
+    }
+    return p;
+  }
+
+  template <class T>
+  T* maybe_pod_malloc(size_t numElems) {
+    return maybe_pod_arena_malloc<T>(js::MallocArena, numElems);
+  }
+
+  template <class T>
+  T* maybe_pod_calloc(size_t numElems) {
+    return maybe_pod_arena_calloc<T>(js::MallocArena, numElems);
+  }
+
+  template <class T>
+  T* maybe_pod_realloc(T* prior, size_t oldSize, size_t newSize) {
+    return maybe_pod_arena_realloc<T>(js::MallocArena, prior, oldSize, newSize);
+  }
+
+  template <class T>
+  T* pod_malloc() {
+    return pod_malloc<T>(1);
+  }
+
+  template <class T>
+  T* pod_arena_malloc(arena_id_t arena, size_t numElems) {
+    T* p = maybe_pod_arena_malloc<T>(arena, numElems);
+    if (MOZ_LIKELY(p)) {
+      return p;
+    }
+    size_t bytes;
+    if (MOZ_UNLIKELY(!CalculateAllocSize<T>(numElems, &bytes))) {
+      client()->reportAllocationOverflow();
+      return nullptr;
+    }
+    p = (T*)client()->onOutOfMemory(AllocFunction::Malloc, arena, bytes);
+    if (p) {
+      client()->updateMallocCounter(bytes);
+    }
+    return p;
+  }
+
+  template <class T>
+  T* pod_malloc(size_t numElems) {
+    return pod_arena_malloc<T>(js::MallocArena, numElems);
+  }
+
+  template <class T, class U>
+  T* pod_malloc_with_extra(size_t numExtra) {
+    size_t bytes;
+    if (MOZ_UNLIKELY((!CalculateAllocSizeWithExtra<T, U>(numExtra, &bytes)))) {
+      client()->reportAllocationOverflow();
+      return nullptr;
+    }
+    T* p = static_cast<T*>(js_malloc(bytes));
+    if (MOZ_LIKELY(p)) {
+      client()->updateMallocCounter(bytes);
+      return p;
+    }
+    p = (T*)client()->onOutOfMemory(AllocFunction::Malloc, js::MallocArena,
+                                    bytes);
+    if (p) {
+      client()->updateMallocCounter(bytes);
+    }
+    return p;
+  }
+
+  template <class T>
+  UniquePtr<T[], JS::FreePolicy> make_pod_arena_array(arena_id_t arena,
+                                                      size_t numElems) {
+    return UniquePtr<T[], JS::FreePolicy>(pod_arena_malloc<T>(arena, numElems));
+  }
+
+  template <class T>
+  UniquePtr<T[], JS::FreePolicy> make_pod_array(size_t numElems) {
+    return make_pod_arena_array<T>(js::MallocArena, numElems);
+  }
+
+  template <class T>
+  T* pod_arena_calloc(arena_id_t arena, size_t numElems = 1) {
+    T* p = maybe_pod_arena_calloc<T>(arena, numElems);
+    if (MOZ_LIKELY(p)) {
+      return p;
+    }
+    size_t bytes;
+    if (MOZ_UNLIKELY(!CalculateAllocSize<T>(numElems, &bytes))) {
+      client()->reportAllocationOverflow();
+      return nullptr;
+    }
+    p = (T*)client()->onOutOfMemory(AllocFunction::Calloc, arena, bytes);
+    if (p) {
+      client()->updateMallocCounter(bytes);
+    }
+    return p;
+  }
+
+  template <class T>
+  T* pod_calloc(size_t numElems = 1) {
+    return pod_arena_calloc<T>(js::MallocArena, numElems);
+  }
+
+  template <class T, class U>
+  T* pod_calloc_with_extra(size_t numExtra) {
+    size_t bytes;
+    if (MOZ_UNLIKELY((!CalculateAllocSizeWithExtra<T, U>(numExtra, &bytes)))) {
+      client()->reportAllocationOverflow();
+      return nullptr;
+    }
+    T* p = static_cast<T*>(js_calloc(bytes));
+    if (p) {
+      client()->updateMallocCounter(bytes);
+      return p;
+    }
+    p = (T*)client()->onOutOfMemory(AllocFunction::Calloc, js::MallocArena,
+                                    bytes);
+    if (p) {
+      client()->updateMallocCounter(bytes);
+    }
+    return p;
+  }
+
+  template <class T>
+  UniquePtr<T[], JS::FreePolicy> make_zeroed_pod_array(size_t numElems) {
+    return UniquePtr<T[], JS::FreePolicy>(pod_calloc<T>(numElems));
+  }
+
+  template <class T>
+  T* pod_arena_realloc(arena_id_t arena, T* prior, size_t oldSize,
+                       size_t newSize) {
+    T* p = maybe_pod_arena_realloc(arena, prior, oldSize, newSize);
+    if (MOZ_LIKELY(p)) {
+      return p;
+    }
+    size_t bytes;
+    if (MOZ_UNLIKELY(!CalculateAllocSize<T>(newSize, &bytes))) {
+      client()->reportAllocationOverflow();
+      return nullptr;
+    }
+    p = (T*)client()->onOutOfMemory(AllocFunction::Realloc, arena, bytes,
+                                    prior);
+    if (p && newSize > oldSize) {
+      client()->updateMallocCounter((newSize - oldSize) * sizeof(T));
+    }
+    return p;
+  }
+
+  template <class T>
+  T* pod_realloc(T* prior, size_t oldSize, size_t newSize) {
+    return pod_arena_realloc<T>(js::MallocArena, prior, oldSize, newSize);
+  }
+
+  JS_DECLARE_NEW_METHODS(new_, pod_malloc<uint8_t>, MOZ_ALWAYS_INLINE)
+  JS_DECLARE_NEW_ARENA_METHODS(
+      arena_new_,
+      [this](arena_id_t arena, size_t size) {
+        return pod_malloc<uint8_t>(size, arena);
+      },
+      MOZ_ALWAYS_INLINE)
+
+  JS_DECLARE_MAKE_METHODS(make_unique, new_, MOZ_ALWAYS_INLINE)
+  JS_DECLARE_MAKE_METHODS(arena_make_unique, arena_new_, MOZ_ALWAYS_INLINE)
+
+ private:
+  Client* client() { return static_cast<Client*>(this); }
+
+  // The Default implementation is a no-op which can be overridden by the
+  // client.
+  void updateMallocCounter(size_t nbytes) {}
+};
+
+} /* namespace js */
+
+#endif /* vm_MallocProvider_h */