rpcs3/Utilities/JIT.h

#pragma once

#define ASMJIT_EMBED
#define ASMJIT_DEBUG

#include <asmjit/asmjit.h>
#include <array>
#include <functional>

enum class jit_class
{
	ppu_code,
	ppu_data,
	spu_code,
	spu_data,
};

// ASMJIT runtime for emitting code in a single 2G region
struct jit_runtime final : asmjit::HostRuntime
{
	jit_runtime();
	~jit_runtime() override;

	// Allocate executable memory
	asmjit::Error _add(void** dst, asmjit::CodeHolder* code) noexcept override;

	// Do nothing (deallocation is delayed)
	asmjit::Error _release(void* p) noexcept override;

	// Allocate memory
	static u8* alloc(std::size_t size, uint align, bool exec = true) noexcept;

	// Should be called at least once after global initialization
	static void initialize();

	// Deallocate all memory
	static void finalize() noexcept;
};

namespace asmjit
{
	// Should only be used to build global functions
	asmjit::JitRuntime& get_global_runtime();

	// Emit xbegin and adjacent loop, return label at xbegin
	void build_transaction_enter(X86Assembler& c, Label fallback, const X86Gp& ctr, uint less_than);

	// Emit xabort
	void build_transaction_abort(X86Assembler& c, unsigned char code);
}

// Build runtime function with asmjit::X86Assembler
template <typename FT, typename F>
FT build_function_asm(F&& builder)
{
	using namespace asmjit;

	auto& rt = get_global_runtime();

	CodeHolder code;
	code.init(rt.getCodeInfo());
	code._globalHints = asmjit::CodeEmitter::kHintOptimizedAlign;

	std::array<X86Gp, 4> args;
#ifdef _WIN32
	args[0] = x86::rcx;
	args[1] = x86::rdx;
	args[2] = x86::r8;
	args[3] = x86::r9;
#else
	args[0] = x86::rdi;
	args[1] = x86::rsi;
	args[2] = x86::rdx;
	args[3] = x86::rcx;
#endif

	X86Assembler compiler(&code);
	builder(std::ref(compiler), args);

	FT result;

	if (rt.add(&result, &code))
	{
		return nullptr;
	}

	return result;
}

#ifdef LLVM_AVAILABLE

#include <memory>
#include <string>
#include <string_view>
#include <unordered_map>

#include "types.h"
#include "mutex.h"

#include "restore_new.h"
#ifdef _MSC_VER
#pragma warning(push, 0)
#endif
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#include "define_new_memleakdetect.h"

// Temporary compiler interface
class jit_compiler final
{
	// Local LLVM context
	llvm::LLVMContext m_context;

	// JIT Event Listener
	std::unique_ptr<struct EventListener> m_jit_el;

	// Execution instance
	std::unique_ptr<llvm::ExecutionEngine> m_engine;

	// Link table
	std::unordered_map<std::string, u64> m_link;

	// Arch
	std::string m_cpu;

public:
	jit_compiler(const std::unordered_map<std::string, u64>& _link, const std::string& _cpu, u32 flags = 0);
	~jit_compiler();

	// Get LLVM context
	auto& get_context()
	{
		return m_context;
	}

	auto& get_engine() const
	{
		return *m_engine;
	}

	// Add module (path to obj cache dir)
	void add(std::unique_ptr<llvm::Module> module, const std::string& path);

	// Add module (not cached)
	void add(std::unique_ptr<llvm::Module> module);

	// Add object (path to obj file)
	void add(const std::string& path);

	// Finalize
	void fin();

	// Get compiled function address
	u64 get(const std::string& name);

	// Get CPU info
	static std::string cpu(const std::string& _cpu);

	// Check JIT purpose
	bool is_primary() const
	{
		return !m_link.empty();
	}
};

#endif