Vyacheslav Egorov
9ff0a654ca
This reverts commit6da340bf76. Reason for revert: almost all benchmarks are now failing on Golem linux-x64 target. Flutter Golem build is broken Original change's description: > Reland "[VM runtime] Dual mapping of executable pages." > > This is a reland of44186dfdcd> > Original change's description: > > [VM runtime] Dual mapping of executable pages. > > > > Change-Id: Iaad78d324e25462ce951f4df26974a6a368c50b7 > > Reviewed-on: https://dart-review.googlesource.com/c/93377 > > Commit-Queue: Régis Crelier <regis@google.com> > > Reviewed-by: Ryan Macnak <rmacnak@google.com> > > Change-Id: I7a0caa078950637d9fe831732577fd2467061099 > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/95263 > Reviewed-by: Ryan Macnak <rmacnak@google.com> TBR=rmacnak@google.com,regis@google.com Change-Id: I3342de2584537269ffe9a53946bef27cb25a69fc No-Presubmit: true No-Tree-Checks: true No-Try: true Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96161 Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
40 lines
1.4 KiB
C++
40 lines
1.4 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() == region_.size()) { // Don't create holes in reservation.
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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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}
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region_.Subregion(region_, 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(0, 0); // NULL reservation indicates VM should not
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// attempt to free this memory.
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VirtualMemory* memory = new VirtualMemory(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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