mirror of
https://github.com/RPCS3/rpcs3.git
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328 lines
8.6 KiB
C++
328 lines
8.6 KiB
C++
#ifdef LLVM_AVAILABLE
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#include <unordered_map>
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#include <map>
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#include <unordered_set>
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#include <set>
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#include <array>
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#include "types.h"
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#include "Macro.h"
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#include "StrFmt.h"
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#include "File.h"
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#include "Log.h"
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#ifdef _MSC_VER
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#pragma warning(push, 0)
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#endif
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
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#include "llvm/ExecutionEngine/JITEventListener.h"
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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#ifdef _WIN32
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#include <Windows.h>
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#else
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#endif
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#include "JIT.h"
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// Global LLVM context (thread-unsafe)
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llvm::LLVMContext g_llvm_ctx;
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// Size of virtual memory area reserved: 512 MB
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static const u64 s_memory_size = 0x20000000;
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// Try to reserve a portion of virtual memory in the first 2 GB address space beforehand, if possible.
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static void* const s_memory = []() -> void*
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{
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#ifdef _WIN32
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for (u64 addr = 0x1000000; addr <= 0x60000000; addr += 0x1000000)
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{
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if (VirtualAlloc((void*)addr, s_memory_size, MEM_RESERVE, PAGE_NOACCESS))
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{
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return (void*)addr;
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}
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}
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return VirtualAlloc(NULL, s_memory_size, MEM_RESERVE, PAGE_NOACCESS);
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#else
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return ::mmap((void*)0x10000000, s_memory_size, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
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#endif
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}();
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// EH frames
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static u8* s_unwind_info;
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static u64 s_unwind_size;
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#ifdef _WIN32
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static std::vector<RUNTIME_FUNCTION> s_unwind; // Custom .pdata section replacement
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#endif
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// Helper class
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struct MemoryManager final : llvm::RTDyldMemoryManager
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{
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std::unordered_map<std::string, std::uintptr_t> table;
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MemoryManager(std::unordered_map<std::string, std::uintptr_t>&& table)
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: table(std::move(table))
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{
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}
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[[noreturn]] static void null()
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{
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throw std::runtime_error("Null function" HERE);
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}
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virtual u64 getSymbolAddress(const std::string& name) override
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{
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if (u64 addr = RTDyldMemoryManager::getSymbolAddress(name))
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{
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// This may be bad if LLVM requests some built-in functions like fma.
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LOG_ERROR(GENERAL, "LLVM: Symbol requested %s -> 0x%016llx", name, addr);
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return addr;
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}
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const auto found = table.find(name);
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if (found != table.end())
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{
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return found->second;
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}
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// It's fine if some function is never called, for example.
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LOG_ERROR(GENERAL, "LLVM: Linkage failed for %s", name);
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return (u64)null;
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}
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virtual u8* allocateCodeSection(std::uintptr_t size, uint align, uint sec_id, llvm::StringRef sec_name) override
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{
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// Simple allocation
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const u64 next = ::align((u64)m_next + size, 4096);
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if (next > (u64)s_memory + s_memory_size)
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{
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LOG_FATAL(GENERAL, "LLVM: Out of memory (size=0x%llx, aligned 0x%x)", size, align);
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return nullptr;
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}
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#ifdef _WIN32
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if (!VirtualAlloc(m_next, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE))
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#else
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if (::mprotect(m_next, size, PROT_READ | PROT_WRITE | PROT_EXEC))
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#endif
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{
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LOG_FATAL(GENERAL, "LLVM: Failed to allocate memory at 0x%p", m_next);
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return nullptr;
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}
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LOG_SUCCESS(GENERAL, "LLVM: Code section %u '%s' allocated -> 0x%p (size=0x%llx, aligned 0x%x)", sec_id, sec_name.data(), m_next, size, align);
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return (u8*)std::exchange(m_next, (void*)next);
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}
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virtual u8* allocateDataSection(std::uintptr_t size, uint align, uint sec_id, llvm::StringRef sec_name, bool is_ro) override
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{
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// Simple allocation
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const u64 next = ::align((u64)m_next + size, 4096);
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if (next > (u64)s_memory + s_memory_size)
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{
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LOG_FATAL(GENERAL, "LLVM: Out of memory (size=0x%llx, aligned 0x%x)", size, align);
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return nullptr;
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}
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#ifdef _WIN32
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if (!VirtualAlloc(m_next, size, MEM_COMMIT, PAGE_READWRITE))
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#else
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if (::mprotect(m_next, size, PROT_READ | PROT_WRITE))
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#endif
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{
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LOG_FATAL(GENERAL, "LLVM: Failed to allocate memory at 0x%p", m_next);
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return nullptr;
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}
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LOG_SUCCESS(GENERAL, "LLVM: Data section %u '%s' allocated -> 0x%p (size=0x%llx, aligned 0x%x, %s)", sec_id, sec_name.data(), m_next, size, align, is_ro ? "ro" : "rw");
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return (u8*)std::exchange(m_next, (void*)next);
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}
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virtual bool finalizeMemory(std::string* = nullptr) override
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{
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// TODO: make sections read-only when necessary
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return false;
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}
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virtual void registerEHFrames(u8* addr, u64 load_addr, std::size_t size) override
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{
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s_unwind_info = addr;
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s_unwind_size = size;
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return RTDyldMemoryManager::registerEHFrames(addr, load_addr, size);
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}
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virtual void deregisterEHFrames(u8* addr, u64 load_addr, std::size_t size) override
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{
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LOG_ERROR(GENERAL, "deregisterEHFrames() called"); // Not expected
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return RTDyldMemoryManager::deregisterEHFrames(addr, load_addr, size);
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}
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~MemoryManager()
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{
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#ifdef _WIN32
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if (!RtlDeleteFunctionTable(s_unwind.data()))
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{
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LOG_FATAL(GENERAL, "RtlDeleteFunctionTable(addr=0x%p) failed! Error %u", s_unwind_info, GetLastError());
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}
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if (!VirtualFree(s_memory, 0, MEM_DECOMMIT))
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{
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LOG_FATAL(GENERAL, "VirtualFree(0x%p) failed! Error %u", s_memory, GetLastError());
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}
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#else
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if (::mprotect(s_memory, s_memory_size, PROT_NONE))
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{
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LOG_FATAL(GENERAL, "mprotect(0x%p) failed! Error %d", s_memory, errno);
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}
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// TODO: unregister EH frames if necessary
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#endif
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}
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private:
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void* m_next = s_memory;
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};
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// Helper class
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struct EventListener final : llvm::JITEventListener
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{
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virtual void NotifyObjectEmitted(const llvm::object::ObjectFile& obj, const llvm::RuntimeDyld::LoadedObjectInfo& inf) override
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{
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const llvm::StringRef elf = obj.getData();
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fs::file(fs::get_config_dir() + "LLVM.obj", fs::rewrite)
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.write(elf.data(), elf.size());
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}
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};
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static EventListener s_listener;
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jit_compiler::jit_compiler(std::unique_ptr<llvm::Module>&& _module, std::unordered_map<std::string, std::uintptr_t>&& table)
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{
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EXPECTS(s_memory);
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std::string result;
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const auto module_ptr = _module.get();
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// Initialization
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llvm::InitializeNativeTarget();
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llvm::InitializeNativeTargetAsmPrinter();
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LLVMLinkInMCJIT();
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m_engine.reset(llvm::EngineBuilder(std::move(_module))
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.setErrorStr(&result)
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.setMCJITMemoryManager(std::make_unique<MemoryManager>(std::move(table)))
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.setOptLevel(llvm::CodeGenOpt::Aggressive)
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.setRelocationModel(llvm::Reloc::PIC_)
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.setCodeModel((u64)s_memory <= 0x60000000 ? llvm::CodeModel::Medium : llvm::CodeModel::Large) // TODO
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.setMCPU(llvm::sys::getHostCPUName())
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.create());
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if (!m_engine)
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{
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throw fmt::exception("LLVM: Failed to create ExecutionEngine: %s", result);
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}
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m_engine->setProcessAllSections(true); // ???
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m_engine->RegisterJITEventListener(&s_listener);
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m_engine->finalizeObject();
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for (auto& func : module_ptr->functions())
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{
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if (!func.empty())
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{
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const std::string& name = func.getName();
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// Register compiled function
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m_map[name] = m_engine->getFunctionAddress(name);
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}
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// Delete IR to lower memory consumption
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func.deleteBody();
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}
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#ifdef _WIN32
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// Register .xdata UNWIND_INFO (.pdata section is empty for some reason)
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std::set<u64> func_set;
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for (const auto& pair : m_map)
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{
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func_set.emplace(pair.second);
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}
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// Hack (cannot obtain last function size)
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func_set.emplace(::align(*--func_set.end() + 4096, 4096));
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const u64 base = (u64)s_memory;
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const u8* bits = s_unwind_info;
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s_unwind.clear();
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s_unwind.reserve(m_map.size());
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for (auto it = func_set.begin(), end = --func_set.end(); it != end; it++)
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{
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const u64 addr = *it;
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const u64 next = *func_set.upper_bound(addr);
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// Generate RUNTIME_FUNCTION record
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RUNTIME_FUNCTION uw;
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uw.BeginAddress = static_cast<u32>(addr - base);
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uw.EndAddress = static_cast<u32>(next - base);
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uw.UnwindData = static_cast<u32>((u64)bits - base);
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s_unwind.emplace_back(uw);
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// Parse .xdata UNWIND_INFO record
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const u8 flags = *bits++; // Version and flags
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const u8 prolog = *bits++; // Size of prolog
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const u8 count = *bits++; // Count of unwind codes
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const u8 frame = *bits++; // Frame Reg + Off
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bits += ::align(std::max<u8>(1, count), 2) * sizeof(u16); // UNWIND_CODE array
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if (flags != 1)
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{
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LOG_ERROR(GENERAL, "LLVM: unsupported UNWIND_INFO version/flags (0x%02x)", flags);
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break;
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}
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LOG_TRACE(GENERAL, "LLVM: .xdata at 0x%llx: function 0x%x..0x%x: p0x%02x, c0x%02x, f0x%02x", uw.UnwindData + base, uw.BeginAddress + base, uw.EndAddress + base, prolog, count, frame);
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}
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if (s_unwind_info + s_unwind_size != bits)
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{
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LOG_FATAL(GENERAL, "LLVM: .xdata analysis failed! (0x%p != 0x%p)", s_unwind_info + s_unwind_size, bits);
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}
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else if (!RtlAddFunctionTable(s_unwind.data(), (DWORD)s_unwind.size(), base))
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{
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LOG_FATAL(GENERAL, "RtlAddFunctionTable(addr=0x%p) failed! Error %u", s_unwind_info, GetLastError());
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}
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else
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{
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LOG_SUCCESS(GENERAL, "LLVM: UNWIND_INFO registered (addr=0x%p, size=0x%llx)", s_unwind_info, s_unwind_size);
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}
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#endif
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}
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jit_compiler::~jit_compiler()
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{
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}
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#endif
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