48 lines
1.8 KiB
C++
48 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jit_ProcessExecutableMemory_h
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#define jit_ProcessExecutableMemory_h
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#include "mozilla/Attributes.h"
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namespace js {
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namespace jit {
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// Executable code is allocated in 64K chunks. ExecutableAllocator uses pools
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// that are at least this big. Code we allocate does not necessarily have 64K
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// alignment though.
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static const size_t ExecutableCodePageSize = 64 * 1024;
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enum class ProtectionSetting {
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Protected, // Not readable, writable, or executable.
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Writable,
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Executable,
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};
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extern MOZ_MUST_USE bool ReprotectRegion(void* start, size_t size, ProtectionSetting protection);
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// Functions called at process start-up/shutdown to initialize/release the
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// executable memory region.
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extern MOZ_MUST_USE bool InitProcessExecutableMemory();
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extern void ReleaseProcessExecutableMemory();
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// Allocate/deallocate executable pages.
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extern void* AllocateExecutableMemory(size_t bytes, ProtectionSetting protection);
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extern void DeallocateExecutableMemory(void* addr, size_t bytes);
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// Returns true if we can allocate a few more MB of executable code without
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// hitting our code limit. This function can be used to stop compiling things
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// that are optional (like Baseline and Ion code) when we're about to reach the
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// limit, so we are less likely to OOM or crash. Note that the limit is
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// per-process, so other threads can also allocate code after we call this
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// function.
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extern bool CanLikelyAllocateMoreExecutableMemory();
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} // namespace jit
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} // namespace js
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#endif // jit_ProcessExecutableMemory_h
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