mirror of
https://github.com/hrydgard/ppsspp.git
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96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
// Copyright (C) 2003 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0 or later versions.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#pragma once
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#ifndef _WIN32
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#include <sys/mman.h>
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#endif
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#include <stdint.h>
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// Returns true if we need to avoid setting both writable and executable at the same time (W^X)
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bool PlatformIsWXExclusive();
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#define MEM_PROT_READ 1
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#define MEM_PROT_WRITE 2
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#define MEM_PROT_EXEC 4
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// Note that some platforms go through special contortions to allocate executable memory. So for memory
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// that's intended for execution, allocate it first using AllocateExecutableMemory, then modify protection as desired.
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// AllocateMemoryPages is simpler and more generic. Note that on W^X platforms, this will return executable but not writable
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// memory!
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void* AllocateExecutableMemory(size_t size);
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void* AllocateMemoryPages(size_t size, uint32_t memProtFlags);
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// Note that on platforms returning PlatformIsWXExclusive, you cannot set a page to be both readable and writable at the same time.
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bool ProtectMemoryPages(const void* ptr, size_t size, uint32_t memProtFlags);
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void FreeMemoryPages(void* ptr, size_t size);
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// Regular aligned memory. Don't try to apply memory protection willy-nilly to memory allocated this way as in-page alignment is unknown (though could be checked).
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void* AllocateAlignedMemory(size_t size, size_t alignment);
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void FreeAlignedMemory(void* ptr);
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int GetMemoryProtectPageSize();
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// A simple buffer that bypasses the libc memory allocator. As a result the buffer is always page-aligned.
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template <typename T>
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class SimpleBuf {
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public:
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SimpleBuf() : buf_(0), size_(0) {}
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SimpleBuf(size_t size) : buf_(0) {
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resize(size);
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}
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SimpleBuf(const SimpleBuf &o) : buf_(o.buf_), size_(o.size_) {}
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// Move constructor
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SimpleBuf(SimpleBuf &&o) noexcept : buf_(o.buf_), size_(o.size_) { o.buf_ = nullptr; o.size_ = 0; }
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~SimpleBuf() {
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if (buf_ != 0) {
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FreeMemoryPages(buf_, size_ * sizeof(T));
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}
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}
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inline T &operator[](size_t index) {
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return buf_[index];
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}
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// Doesn't preserve contents.
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void resize(size_t size) {
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if (size_ < size) {
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if (buf_ != 0) {
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FreeMemoryPages(buf_, size_ * sizeof(T));
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}
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buf_ = (T *)AllocateMemoryPages(size * sizeof(T), MEM_PROT_READ | MEM_PROT_WRITE);
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size_ = size;
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}
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}
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T *data() {
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return buf_;
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}
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size_t size() const {
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return size_;
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}
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private:
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T *buf_;
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size_t size_;
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};
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