Ryan Macnak
1eae028526
Unfortunately we cannot enable -Wzero-as-null-pointer-constant because of zlib and icu headers we include. TEST=build Change-Id: I9ffd7d7e26f2b3dd616ce54d164b92e60a2366dc Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/293882 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/virtual_memory.h"
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#include "platform/assert.h"
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#include "platform/utils.h"
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namespace dart {
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bool VirtualMemory::InSamePage(uword address0, uword address1) {
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return (Utils::RoundDown(address0, PageSize()) ==
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Utils::RoundDown(address1, PageSize()));
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}
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void VirtualMemory::Truncate(intptr_t new_size) {
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ASSERT(Utils::IsAligned(new_size, PageSize()));
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ASSERT(new_size <= size());
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if (reserved_.size() ==
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region_.size()) { // Don't create holes in reservation.
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if (FreeSubSegment(reinterpret_cast<void*>(start() + new_size),
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size() - new_size)) {
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reserved_.set_size(new_size);
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if (AliasOffset() != 0) {
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FreeSubSegment(reinterpret_cast<void*>(alias_.start() + new_size),
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alias_.size() - new_size);
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}
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}
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}
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region_.Subregion(region_, 0, new_size);
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alias_.Subregion(alias_, 0, new_size);
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}
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VirtualMemory* VirtualMemory::ForImagePage(void* pointer, uword size) {
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// Memory for precompilated instructions was allocated by the embedder, so
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// create a VirtualMemory without allocating.
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MemoryRegion region(pointer, size);
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MemoryRegion reserved(nullptr, 0); // null reservation indicates VM should
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// not attempt to free this memory.
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VirtualMemory* memory = new VirtualMemory(region, region, reserved);
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ASSERT(!memory->vm_owns_region());
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return memory;
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}
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} // namespace dart
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