mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2024-11-15 13:57:57 -07:00
122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
// Copyright 2014 Dolphin Emulator Project
|
|
// Licensed under GPLv2+
|
|
// Refer to the license.txt file included.
|
|
|
|
#pragma once
|
|
|
|
#include <cstddef>
|
|
#include <vector>
|
|
|
|
#include "Common/Assert.h"
|
|
#include "Common/CommonTypes.h"
|
|
#include "Common/MemoryUtil.h"
|
|
|
|
namespace Common
|
|
{
|
|
// Everything that needs to generate code should inherit from this.
|
|
// You get memory management for free, plus, you can use all emitter functions without
|
|
// having to prefix them with gen-> or something similar.
|
|
// Example implementation:
|
|
// class JIT : public CodeBlock<ARMXEmitter> {}
|
|
template <class T>
|
|
class CodeBlock : public T
|
|
{
|
|
private:
|
|
// A privately used function to set the executable RAM space to something invalid.
|
|
// For debugging usefulness it should be used to set the RAM to a host specific breakpoint
|
|
// instruction
|
|
virtual void PoisonMemory() = 0;
|
|
|
|
protected:
|
|
u8* region = nullptr;
|
|
// Size of region we can use.
|
|
size_t region_size = 0;
|
|
// Original size of the region we allocated.
|
|
size_t total_region_size = 0;
|
|
|
|
bool m_is_child = false;
|
|
std::vector<CodeBlock*> m_children;
|
|
|
|
public:
|
|
CodeBlock() = default;
|
|
virtual ~CodeBlock()
|
|
{
|
|
if (region)
|
|
FreeCodeSpace();
|
|
}
|
|
CodeBlock(const CodeBlock&) = delete;
|
|
CodeBlock& operator=(const CodeBlock&) = delete;
|
|
CodeBlock(CodeBlock&&) = delete;
|
|
CodeBlock& operator=(CodeBlock&&) = delete;
|
|
|
|
// Call this before you generate any code.
|
|
void AllocCodeSpace(size_t size)
|
|
{
|
|
region_size = size;
|
|
total_region_size = size;
|
|
region = static_cast<u8*>(Common::AllocateExecutableMemory(total_region_size));
|
|
T::SetCodePtr(region, region + size);
|
|
}
|
|
|
|
// Always clear code space with breakpoints, so that if someone accidentally executes
|
|
// uninitialized, it just breaks into the debugger.
|
|
void ClearCodeSpace()
|
|
{
|
|
PoisonMemory();
|
|
ResetCodePtr();
|
|
}
|
|
|
|
// Call this when shutting down. Don't rely on the destructor, even though it'll do the job.
|
|
void FreeCodeSpace()
|
|
{
|
|
ASSERT(!m_is_child);
|
|
Common::FreeMemoryPages(region, total_region_size);
|
|
region = nullptr;
|
|
region_size = 0;
|
|
total_region_size = 0;
|
|
for (CodeBlock* child : m_children)
|
|
{
|
|
child->region = nullptr;
|
|
child->region_size = 0;
|
|
child->total_region_size = 0;
|
|
}
|
|
}
|
|
|
|
bool IsInSpace(const u8* ptr) const { return ptr >= region && ptr < (region + region_size); }
|
|
// Cannot currently be undone. Will write protect the entire code region.
|
|
// Start over if you need to change the code (call FreeCodeSpace(), AllocCodeSpace()).
|
|
void WriteProtect() { Common::WriteProtectMemory(region, region_size, true); }
|
|
void ResetCodePtr() { T::SetCodePtr(region, region + region_size); }
|
|
size_t GetSpaceLeft() const
|
|
{
|
|
ASSERT(static_cast<size_t>(T::GetCodePtr() - region) < region_size);
|
|
return region_size - (T::GetCodePtr() - region);
|
|
}
|
|
|
|
bool IsAlmostFull() const
|
|
{
|
|
// This should be bigger than the biggest block ever.
|
|
return GetSpaceLeft() < 0x10000;
|
|
}
|
|
|
|
bool HasChildren() const { return region_size != total_region_size; }
|
|
u8* AllocChildCodeSpace(size_t child_size)
|
|
{
|
|
ASSERT_MSG(DYNA_REC, child_size < GetSpaceLeft(), "Insufficient space for child allocation.");
|
|
u8* child_region = region + region_size - child_size;
|
|
region_size -= child_size;
|
|
return child_region;
|
|
}
|
|
void AddChildCodeSpace(CodeBlock* child, size_t child_size)
|
|
{
|
|
u8* child_region = AllocChildCodeSpace(child_size);
|
|
child->m_is_child = true;
|
|
child->region = child_region;
|
|
child->region_size = child_size;
|
|
child->total_region_size = child_size;
|
|
child->ResetCodePtr();
|
|
m_children.emplace_back(child);
|
|
}
|
|
};
|
|
} // namespace Common
|